55 files changed, 2013 insertions, 1640 deletions

diff --git a/plugins/check_apt.c b/plugins/check_apt.c
index fa982ae3..5c0f6e28 100644
--- a/plugins/check_apt.c
+++ b/plugins/check_apt.c
@@ -94,7 +94,7 @@ static int stderr_warning = 0;   /* if a cmd issued output on stderr */
 static int exec_warning = 0;     /* if a cmd exited non-zero */
 
 int main (int argc, char **argv) {
-        int result=STATE_UNKNOWN, packages_available=0, sec_count=0, i=0;
+        int result=STATE_UNKNOWN, packages_available=0, sec_count=0;
         char **packages_list=NULL, **secpackages_list=NULL;
 
         /* Parse extra opts if any */
@@ -142,10 +142,11 @@ int main (int argc, char **argv) {
                 qsort(secpackages_list, sec_count, sizeof(char*), cmpstringp);
                 qsort(packages_list, packages_available-sec_count, sizeof(char*), cmpstringp);
 
-                for(i = 0; i < sec_count; i++)
+                for(int i = 0; i < sec_count; i++)
                         printf("%s (security)\n", secpackages_list[i]);
+
                 if (only_critical == false) {
-                        for(i = 0; i < packages_available - sec_count; i++)
+                        for(int i = 0; i < packages_available - sec_count; i++)
                                 printf("%s\n", packages_list[i]);
                 }
         }
@@ -251,7 +252,7 @@ int process_arguments (int argc, char **argv) {
 
 /* run an apt-get upgrade */
 int run_upgrade(int *pkgcount, int *secpkgcount, char ***pkglist, char ***secpkglist){
-        int i=0, result=STATE_UNKNOWN, regres=0, pc=0, spc=0;
+        int result=STATE_UNKNOWN, regres=0, pc=0, spc=0;
         struct output chld_out, chld_err;
         regex_t ireg, ereg, sreg;
         char *cmdline=NULL, rerrbuf[64];
@@ -320,7 +321,7 @@ int run_upgrade(int *pkgcount, int *secpkgcount, char ***pkglist, char ***secpkg
          * we may need to switch to the --print-uris output format,
          * in which case the logic here will slightly change.
          */
-        for(i = 0; i < chld_out.lines; i++) {
+        for(size_t i = 0; i < chld_out.lines; i++) {
                 if(verbose){
                         printf("%s\n", chld_out.line[i]);
                 }
@@ -353,7 +354,7 @@ int run_upgrade(int *pkgcount, int *secpkgcount, char ***pkglist, char ***secpkg
                 stderr_warning=1;
                 result = max_state(result, STATE_WARNING);
                 if(verbose){
-                        for(i = 0; i < chld_err.lines; i++) {
+                        for(size_t i = 0; i < chld_err.lines; i++) {
                                 fprintf(stderr, "%s\n", chld_err.line[i]);
                         }
                 }
@@ -367,7 +368,7 @@ int run_upgrade(int *pkgcount, int *secpkgcount, char ***pkglist, char ***secpkg
 
 /* run an apt-get update (needs root) */
 int run_update(void){
-        int i=0, result=STATE_UNKNOWN;
+        int result=STATE_UNKNOWN;
         struct output chld_out, chld_err;
         char *cmdline;
 
@@ -385,7 +386,7 @@ int run_update(void){
         }
 
         if(verbose){
-                for(i = 0; i < chld_out.lines; i++) {
+                for(size_t i = 0; i < chld_out.lines; i++) {
                         printf("%s\n", chld_out.line[i]);
                 }
         }
@@ -395,7 +396,7 @@ int run_update(void){
                 stderr_warning=1;
                 result = max_state(result, STATE_WARNING);
                 if(verbose){
-                        for(i = 0; i < chld_err.lines; i++) {
+                        for(size_t i = 0; i < chld_err.lines; i++) {
                                 fprintf(stderr, "%s\n", chld_err.line[i]);
                         }
                 }
diff --git a/plugins/check_by_ssh.c b/plugins/check_by_ssh.c
index 1ad547ed..2a23b397 100644
--- a/plugins/check_by_ssh.c
+++ b/plugins/check_by_ssh.c
@@ -50,7 +50,7 @@ unsigned int services = 0;
 int skip_stdout = 0;
 int skip_stderr = 0;
 int warn_on_stderr = 0;
-bool unknown_timeout = FALSE;
+bool unknown_timeout = false;
 char *remotecmd = NULL;
 char **commargv = NULL;
 int commargc = 0;
@@ -58,8 +58,8 @@ char *hostname = NULL;
 char *outputfile = NULL;
 char *host_shortname = NULL;
 char **service;
-int passive = FALSE;
-int verbose = FALSE;
+bool passive = false;
+bool verbose = false;
 
 int
 main (int argc, char **argv)
@@ -68,7 +68,6 @@ main (int argc, char **argv)
         char *status_text;
         int cresult;
         int result = STATE_UNKNOWN;
-        int i;
         time_t local_time;
         FILE *fp = NULL;
         output chld_out, chld_err;
@@ -96,7 +95,7 @@ main (int argc, char **argv)
         /* run the command */
         if (verbose) {
                 printf ("Command: %s\n", commargv[0]);
-                for (i=1; i<commargc; i++)
+                for (int i = 1; i < commargc; i++)
                         printf ("Argument %i: %s\n", i, commargv[i]);
         }
 
@@ -110,9 +109,9 @@ main (int argc, char **argv)
         }
 
         if (verbose) {
-                for(i = 0; i < chld_out.lines; i++)
+                for(size_t i = 0; i < chld_out.lines; i++)
                         printf("stdout: %s\n", chld_out.line[i]);
-                for(i = 0; i < chld_err.lines; i++)
+                for(size_t i = 0; i < chld_err.lines; i++)
                         printf("stderr: %s\n", chld_err.line[i]);
         }
 
@@ -122,7 +121,7 @@ main (int argc, char **argv)
                 skip_stderr = chld_err.lines;
 
         /* UNKNOWN or worse if (non-skipped) output found on stderr */
-        if(chld_err.lines > skip_stderr) {
+        if(chld_err.lines > (size_t)skip_stderr) {
                 printf (_("Remote command execution failed: %s\n"),
                         chld_err.line[skip_stderr]);
                 if ( warn_on_stderr ) 
@@ -134,8 +133,8 @@ main (int argc, char **argv)
         /* this is simple if we're not supposed to be passive.
          * Wrap up quickly and keep the tricks below */
         if(!passive) {
-                if (chld_out.lines > skip_stdout)
-                        for (i = skip_stdout; i < chld_out.lines; i++)
+                if (chld_out.lines > (size_t)skip_stdout)
+                        for (size_t i = skip_stdout; i < chld_out.lines; i++)
                                 puts (chld_out.line[i]);
                 else
                         printf (_("%s - check_by_ssh: Remote command '%s' returned status %d\n"),
@@ -156,7 +155,7 @@ main (int argc, char **argv)
 
         local_time = time (NULL);
         commands = 0;
-        for(i = skip_stdout; i < chld_out.lines; i++) {
+        for(size_t i = skip_stdout; i < chld_out.lines; i++) {
                 status_text = chld_out.line[i++];
                 if (i == chld_out.lines || strstr (chld_out.line[i], "STATUS CODE: ") == NULL)
                         die (STATE_UNKNOWN, _("%s: Error parsing output\n"), progname);
@@ -235,7 +234,7 @@ process_arguments (int argc, char **argv)
                         print_help ();
                         exit (STATE_UNKNOWN);
                 case 'v':                                                                       /* help */
-                        verbose = TRUE;
+                        verbose = true;
                         break;
                 case 't':                                                                       /* timeout period */
                         if (!is_integer (optarg))
@@ -244,7 +243,7 @@ process_arguments (int argc, char **argv)
                                 timeout_interval = atoi (optarg);
                         break;
                 case 'U':
-                        unknown_timeout = TRUE;
+                        unknown_timeout = true;
                         break;
                 case 'H':                                                                       /* host */
                         hostname = optarg;
@@ -257,7 +256,7 @@ process_arguments (int argc, char **argv)
                         break;
                 case 'O':                                                                       /* output file */
                         outputfile = optarg;
-                        passive = TRUE;
+                        passive = true;
                         break;
                 case 's':                                                                       /* description of service to check */
                         p1 = optarg;
diff --git a/plugins/check_curl.c b/plugins/check_curl.c
index d0871c48..d3bddacd 100644
--- a/plugins/check_curl.c
+++ b/plugins/check_curl.c
@@ -134,6 +134,7 @@ char regexp[MAX_RE_SIZE];
 int cflags = REG_NOSUB | REG_EXTENDED | REG_NEWLINE;
 int errcode;
 bool invert_regex = false;
+int state_regex = STATE_CRITICAL;
 
 char *server_address = NULL;
 char *host_name = NULL;
@@ -213,6 +214,7 @@ char *client_privkey = NULL;
 char *ca_cert = NULL;
 bool verify_peer_and_host = false;
 bool is_openssl_callback = false;
+bool add_sslctx_verify_fun = false;
 #if defined(HAVE_SSL) && defined(USE_OPENSSL)
 X509 *cert = NULL;
 #endif /* defined(HAVE_SSL) && defined(USE_OPENSSL) */
@@ -223,6 +225,7 @@ curlhelp_ssl_library ssl_library = CURLHELP_SSL_LIBRARY_UNKNOWN;
 int curl_http_version = CURL_HTTP_VERSION_NONE;
 bool automatic_decompression = false;
 char *cookie_jar_file = NULL;
+bool haproxy_protocol = false;
 
 bool process_arguments (int, char**);
 void handle_curl_option_return_code (CURLcode res, const char* option);
@@ -239,10 +242,10 @@ void print_help (void);
 void print_usage (void);
 void print_curl_version (void);
 int curlhelp_initwritebuffer (curlhelp_write_curlbuf*);
-int curlhelp_buffer_write_callback (void*, size_t , size_t , void*);
+size_t curlhelp_buffer_write_callback(void*, size_t , size_t , void*);
 void curlhelp_freewritebuffer (curlhelp_write_curlbuf*);
 int curlhelp_initreadbuffer (curlhelp_read_curlbuf *, const char *, size_t);
-int curlhelp_buffer_read_callback (void *, size_t , size_t , void *);
+size_t curlhelp_buffer_read_callback(void *, size_t , size_t , void *);
 void curlhelp_freereadbuffer (curlhelp_read_curlbuf *);
 curlhelp_ssl_library curlhelp_get_ssl_library ();
 const char* curlhelp_get_ssl_library_string (curlhelp_ssl_library);
@@ -297,7 +300,7 @@ main (int argc, char **argv)
 
 int verify_callback(int preverify_ok, X509_STORE_CTX *x509_ctx)
 {
-        (void) preverify_ok;
+  (void) preverify_ok;
   /* TODO: we get all certificates of the chain, so which ones
    * should we test?
    * TODO: is the last certificate always the server certificate?
@@ -322,9 +325,18 @@ int verify_callback(int preverify_ok, X509_STORE_CTX *x509_ctx)
 
 CURLcode sslctxfun(CURL *curl, SSL_CTX *sslctx, void *parm)
 {
-        (void) curl; // ignore unused parameter
-        (void) parm; // ignore unused parameter
-  SSL_CTX_set_verify(sslctx, SSL_VERIFY_PEER, verify_callback);
+  (void) curl; // ignore unused parameter
+  (void) parm; // ignore unused parameter
+  if(add_sslctx_verify_fun) {
+    SSL_CTX_set_verify(sslctx, SSL_VERIFY_PEER, verify_callback);
+  }
+
+  // workaround for issue:
+  // OpenSSL SSL_read: error:0A000126:SSL routines::unexpected eof while reading, errno 0
+  // see discussion https://github.com/openssl/openssl/discussions/22690
+#ifdef SSL_OP_IGNORE_UNEXPECTED_EOF
+  SSL_CTX_set_options(sslctx, SSL_OP_IGNORE_UNEXPECTED_EOF);
+#endif
 
   return CURLE_OK;
 }
@@ -395,7 +407,7 @@ lookup_host (const char *host, char *buf, size_t buflen)
   char addrstr[100];
   size_t addrstr_len;
   int errcode;
-  void *ptr;
+  void *ptr = { 0 };
   size_t buflen_remaining = buflen - 1;
 
   memset (&hints, 0, sizeof (hints));
@@ -466,6 +478,7 @@ int
 check_http (void)
 {
   int result = STATE_OK;
+  int result_ssl = STATE_OK;
   int page_len = 0;
   int i;
   char *force_host_header = NULL;
@@ -485,7 +498,7 @@ check_http (void)
 
   /* register cleanup function to shut down libcurl properly */
   atexit (cleanup);
-  
+
   if (verbose >= 1)
     handle_curl_option_return_code (curl_easy_setopt (curl, CURLOPT_VERBOSE, 1), "CURLOPT_VERBOSE");
 
@@ -520,6 +533,11 @@ check_http (void)
   handle_curl_option_return_code (curl_easy_setopt (curl, CURLOPT_CONNECTTIMEOUT, socket_timeout), "CURLOPT_CONNECTTIMEOUT");
   handle_curl_option_return_code (curl_easy_setopt (curl, CURLOPT_TIMEOUT, socket_timeout), "CURLOPT_TIMEOUT");
 
+  /* enable haproxy protocol */
+  if (haproxy_protocol) {
+    handle_curl_option_return_code(curl_easy_setopt(curl, CURLOPT_HAPROXYPROTOCOL, 1L), "CURLOPT_HAPROXYPROTOCOL");
+  }
+
   // fill dns resolve cache to make curl connect to the given server_address instead of the host_name, only required for ssl, because we use the host_name later on to make SNI happy
   if(use_ssl && host_name != NULL) {
       if ( (res=lookup_host (server_address, addrstr, DEFAULT_BUFFER_SIZE/2)) != 0) {
@@ -670,9 +688,8 @@ check_http (void)
          * OpenSSL-style libraries only!) */
 #ifdef USE_OPENSSL
         /* libcurl and monitoring plugins built with OpenSSL, good */
-        handle_curl_option_return_code (curl_easy_setopt(curl, CURLOPT_SSL_CTX_FUNCTION, sslctxfun), "CURLOPT_SSL_CTX_FUNCTION");
+        add_sslctx_verify_fun = true;
         is_openssl_callback = true;
-#else /* USE_OPENSSL */
 #endif /* USE_OPENSSL */
         /* libcurl is built with OpenSSL, monitoring plugins, so falling
          * back to manually extracting certificate information */
@@ -705,12 +722,18 @@ check_http (void)
 #else /* LIBCURL_VERSION_NUM >= MAKE_LIBCURL_VERSION(7, 19, 1) */
     /* old libcurl, our only hope is OpenSSL, otherwise we are out of luck */
     if (ssl_library == CURLHELP_SSL_LIBRARY_OPENSSL || ssl_library == CURLHELP_SSL_LIBRARY_LIBRESSL)
-      handle_curl_option_return_code (curl_easy_setopt(curl, CURLOPT_SSL_CTX_FUNCTION, sslctxfun), "CURLOPT_SSL_CTX_FUNCTION");
+      add_sslctx_verify_fun = true;
     else
       die (STATE_CRITICAL, "HTTP CRITICAL - Cannot retrieve certificates (no CURLOPT_SSL_CTX_FUNCTION, no OpenSSL library or libcurl too old and has no CURLOPT_CERTINFO)\n");
 #endif /* LIBCURL_VERSION_NUM >= MAKE_LIBCURL_VERSION(7, 19, 1) */
   }
 
+#if LIBCURL_VERSION_NUM >= MAKE_LIBCURL_VERSION(7, 10, 6) /* required for CURLOPT_SSL_CTX_FUNCTION */
+  // ssl ctx function is not available with all ssl backends
+  if (curl_easy_setopt(curl, CURLOPT_SSL_CTX_FUNCTION, NULL) != CURLE_UNKNOWN_OPTION)
+    handle_curl_option_return_code (curl_easy_setopt(curl, CURLOPT_SSL_CTX_FUNCTION, sslctxfun), "CURLOPT_SSL_CTX_FUNCTION");
+#endif
+
 #endif /* LIBCURL_FEATURE_SSL */
 
   /* set default or user-given user agent identification */
@@ -805,7 +828,7 @@ check_http (void)
       handle_curl_option_return_code (curl_easy_setopt (curl, CURLOPT_INFILESIZE, (curl_off_t)strlen (http_post_data)), "CURLOPT_INFILESIZE");
     }
   }
-  
+
   /* cookie handling */
   if (cookie_jar_file != NULL) {
     handle_curl_option_return_code (curl_easy_setopt (curl, CURLOPT_COOKIEJAR, cookie_jar_file), "CURLOPT_COOKIEJAR");
@@ -845,9 +868,9 @@ check_http (void)
         /* check certificate with OpenSSL functions, curl has been built against OpenSSL
          * and we actually have OpenSSL in the monitoring tools
          */
-        result = np_net_ssl_check_certificate(cert, days_till_exp_warn, days_till_exp_crit);
+        result_ssl = np_net_ssl_check_certificate(cert, days_till_exp_warn, days_till_exp_crit);
         if (!continue_after_check_cert) {
-          return result;
+          return result_ssl;
         }
 #else /* USE_OPENSSL */
         die (STATE_CRITICAL, "HTTP CRITICAL - Cannot retrieve certificates - OpenSSL callback used and not linked against OpenSSL\n");
@@ -891,17 +914,17 @@ GOT_FIRST_CERT:
                                                 die (STATE_CRITICAL, "HTTP CRITICAL - %s\n", msg);
           }
           BIO_free (cert_BIO);
-          result = np_net_ssl_check_certificate(cert, days_till_exp_warn, days_till_exp_crit);
+          result_ssl = np_net_ssl_check_certificate(cert, days_till_exp_warn, days_till_exp_crit);
           if (!continue_after_check_cert) {
-            return result;
+            return result_ssl;
           }
 #else /* USE_OPENSSL */
           /* We assume we don't have OpenSSL and np_net_ssl_check_certificate at our disposal,
            * so we use the libcurl CURLINFO data
            */
-          result = net_noopenssl_check_certificate(&cert_ptr, days_till_exp_warn, days_till_exp_crit);
+          result_ssl = net_noopenssl_check_certificate(&cert_ptr, days_till_exp_warn, days_till_exp_crit);
           if (!continue_after_check_cert) {
-            return result;
+            return result_ssl;
           }
 #endif /* USE_OPENSSL */
         } else {
@@ -1127,7 +1150,7 @@ GOT_FIRST_CERT:
                                 strcpy(msg, tmp);
 
                         }
-                        result = STATE_CRITICAL;
+                        result = state_regex;
                 } else {
                         regerror (errcode, &preg, errbuf, MAX_INPUT_BUFFER);
 
@@ -1167,9 +1190,9 @@ GOT_FIRST_CERT:
       else
         msg[strlen(msg)-3] = '\0';
     }
-  
+
   /* TODO: separate _() msg and status code: die (result, "HTTP %s: %s\n", state_text(result), msg); */
-  die (result, "HTTP %s: %s %d %s%s%s - %d bytes in %.3f second response time %s|%s\n%s%s",
+  die (max_state_alt(result, result_ssl), "HTTP %s: %s %d %s%s%s - %d bytes in %.3f second response time %s|%s\n%s%s",
     state_text(result), string_statuscode (status_line.http_major, status_line.http_minor),
     status_line.http_code, status_line.msg,
     strlen(msg) > 0 ? " - " : "",
@@ -1179,23 +1202,23 @@ GOT_FIRST_CERT:
     (show_body ? body_buf.buf : ""),
     (show_body ? "\n" : "") );
 
-  return result;
+  return max_state_alt(result, result_ssl);
 }
 
 int
 uri_strcmp (const UriTextRangeA range, const char* s)
 {
   if (!range.first) return -1;
-  if (range.afterLast - range.first < strlen (s)) return -1;
-  return strncmp (s, range.first, min( range.afterLast - range.first, strlen (s)));
+  if ( (size_t)(range.afterLast - range.first) < strlen (s) ) return -1;
+  return strncmp (s, range.first, min( (size_t)(range.afterLast - range.first), strlen (s)));
 }
 
 char*
 uri_string (const UriTextRangeA range, char* buf, size_t buflen)
 {
   if (!range.first) return "(null)";
-  strncpy (buf, range.first, max (buflen-1, range.afterLast - range.first));
-  buf[max (buflen-1, range.afterLast - range.first)] = '\0';
+  strncpy (buf, range.first, max (buflen-1, (size_t)(range.afterLast - range.first)));
+  buf[max (buflen-1, (size_t)(range.afterLast - range.first))] = '\0';
   buf[range.afterLast - range.first] = '\0';
   return buf;
 }
@@ -1218,6 +1241,10 @@ redir (curlhelp_write_curlbuf* header_buf)
     &status_line.http_major, &status_line.http_minor, &status_line.http_code, &status_line.msg, &msglen,
     headers, &nof_headers, 0);
 
+        if (res == -1) {
+                die (STATE_UNKNOWN, _("HTTP UNKNOWN - Failed to parse Response\n"));
+        }
+
   location = get_header_value (headers, nof_headers, "location");
 
   if (verbose >= 2)
@@ -1274,10 +1301,12 @@ redir (curlhelp_write_curlbuf* header_buf)
     }
   }
 
-  if (!uri_strcmp (uri.scheme, "https"))
-    use_ssl = true;
-  else
-    use_ssl = false;
+  if (uri.scheme.first) {
+    if (!uri_strcmp (uri.scheme, "https"))
+      use_ssl = true;
+    else
+      use_ssl = false;
+  }
 
   /* we do a sloppy test here only, because uriparser would have failed
    * above, if the port would be invalid, we just check for MAX_PORT
@@ -1295,10 +1324,13 @@ redir (curlhelp_write_curlbuf* header_buf)
          MAX_PORT, location, display_html ? "</A>" : "");
 
   /* by RFC 7231 relative URLs in Location should be taken relative to
-   * the original URL, so wy try to form a new absolute URL here
+   * the original URL, so we try to form a new absolute URL here
    */
   if (!uri.scheme.first && !uri.hostText.first) {
     new_host = strdup (host_name ? host_name : server_address);
+    new_port = server_port;
+    if(use_ssl)
+      uri_string (uri.scheme, "https", DEFAULT_BUFFER_SIZE);
   } else {
     new_host = strdup (uri_string (uri.hostText, buf, DEFAULT_BUFFER_SIZE));
   }
@@ -1380,7 +1412,9 @@ process_arguments (int argc, char **argv)
     CA_CERT_OPTION,
     HTTP_VERSION_OPTION,
     AUTOMATIC_DECOMPRESSION,
-    COOKIE_JAR
+    COOKIE_JAR,
+    HAPROXY_PROTOCOL,
+    STATE_REGEX
   };
 
   int option = 0;
@@ -1419,6 +1453,7 @@ process_arguments (int argc, char **argv)
     {"content-type", required_argument, 0, 'T'},
     {"pagesize", required_argument, 0, 'm'},
     {"invert-regex", no_argument, NULL, INVERT_REGEX},
+    {"state-regex", required_argument, 0, STATE_REGEX},
     {"use-ipv4", no_argument, 0, '4'},
     {"use-ipv6", no_argument, 0, '6'},
     {"extended-perfdata", no_argument, 0, 'E'},
@@ -1427,6 +1462,7 @@ process_arguments (int argc, char **argv)
     {"http-version", required_argument, 0, HTTP_VERSION_OPTION},
     {"enable-automatic-decompression", no_argument, 0, AUTOMATIC_DECOMPRESSION},
     {"cookie-jar", required_argument, 0, COOKIE_JAR},
+    {"haproxy-protocol", no_argument, 0, HAPROXY_PROTOCOL},
     {0, 0, 0, 0}
   };
 
@@ -1694,7 +1730,7 @@ process_arguments (int argc, char **argv)
       else {
         max_depth = atoi (optarg);
       }
-      break;    
+      break;
     case 'f': /* onredirect */
       if (!strcmp (optarg, "ok"))
         onredirect = STATE_OK;
@@ -1753,6 +1789,13 @@ process_arguments (int argc, char **argv)
     case INVERT_REGEX:
       invert_regex = true;
       break;
+    case STATE_REGEX:
+      if (!strcasecmp (optarg, "critical"))
+        state_regex = STATE_CRITICAL;
+      else if (!strcasecmp (optarg, "warning"))
+        state_regex = STATE_WARNING;
+      else usage2 (_("Invalid state-regex option"), optarg);
+      break;
     case '4':
       address_family = AF_INET;
       break;
@@ -1837,6 +1880,9 @@ process_arguments (int argc, char **argv)
     case COOKIE_JAR:
       cookie_jar_file = optarg;
       break;
+    case HAPROXY_PROTOCOL:
+      haproxy_protocol = true;
+      break;
     case '?':
       /* print short usage statement if args not parsable */
       usage5 ();
@@ -1977,8 +2023,11 @@ print_help (void)
   printf ("    %s\n", _("Note: SNI is not supported in libcurl before 7.18.1"));
 #endif
   printf (" %s\n", "-C, --certificate=INTEGER[,INTEGER]");
-  printf ("    %s\n", _("Minimum number of days a certificate has to be valid. Port defaults to 443"));
-  printf ("    %s\n", _("(when this option is used the URL is not checked by default. You can use"));
+  printf ("    %s\n", _("Minimum number of days a certificate has to be valid. Port defaults to 443."));
+  printf ("    %s\n", _("A STATE_WARNING is returned if the certificate has a validity less than the"));
+  printf ("    %s\n", _("first agument's value. If there is a second argument and the certificate's"));
+  printf ("    %s\n", _("validity is less than its value, a STATE_CRITICAL is returned."));
+  printf ("    %s\n", _("(When this option is used the URL is not checked by default. You can use"));
   printf ("    %s\n", _(" --continue-after-certificate to override this behavior)"));
   printf (" %s\n", "--continue-after-certificate");
   printf ("    %s\n", _("Allows the HTTP check to continue after performing the certificate check."));
@@ -2007,7 +2056,7 @@ print_help (void)
   printf (" %s\n", "-u, --url=PATH");
   printf ("    %s\n", _("URL to GET or POST (default: /)"));
   printf (" %s\n", "-P, --post=STRING");
-  printf ("    %s\n", _("URL encoded http POST data"));
+  printf ("    %s\n", _("URL decoded http POST data"));
   printf (" %s\n", "-j, --method=STRING  (for example: HEAD, OPTIONS, TRACE, PUT, DELETE, CONNECT)");
   printf ("    %s\n", _("Set HTTP method."));
   printf (" %s\n", "-N, --no-body");
@@ -2025,7 +2074,10 @@ print_help (void)
   printf (" %s\n", "-R, --eregi=STRING");
   printf ("    %s\n", _("Search page for case-insensitive regex STRING"));
   printf (" %s\n", "--invert-regex");
-  printf ("    %s\n", _("Return CRITICAL if found, OK if not\n"));
+  printf ("    %s\n", _("Return STATE if found, OK if not (STATE is CRITICAL, per default)"));
+  printf ("    %s\n", _("can be changed with --state--regex)"));
+  printf (" %s\n", "--state-regex=STATE");
+  printf ("    %s\n", _("Return STATE if regex is found, OK if not. STATE can be one of \"critical\",\"warning\""));
   printf (" %s\n", "-a, --authorization=AUTH_PAIR");
   printf ("    %s\n", _("Username:password on sites with basic authentication"));
   printf (" %s\n", "-b, --proxy-authorization=AUTH_PAIR");
@@ -2056,7 +2108,9 @@ print_help (void)
   printf ("    %s\n", _("1.0 = HTTP/1.0, 1.1 = HTTP/1.1, 2.0 = HTTP/2 (HTTP/2 will fail without -S)"));
   printf (" %s\n", "--enable-automatic-decompression");
   printf ("    %s\n", _("Enable automatic decompression of body (CURLOPT_ACCEPT_ENCODING)."));
-  printf (" %s\n", "---cookie-jar=FILE");
+  printf(" %s\n", "--haproxy-protocol");
+  printf("    %s\n", _("Send HAProxy proxy protocol v1 header (CURLOPT_HAPROXYPROTOCOL)."));
+  printf (" %s\n", "--cookie-jar=FILE");
   printf ("    %s\n", _("Store cookies in the cookie jar and send them out when requested."));
   printf ("\n");
 
@@ -2140,7 +2194,7 @@ print_usage (void)
   printf ("       [-b proxy_auth] [-f <ok|warning|critical|follow|sticky|stickyport|curl>]\n");
   printf ("       [-e <expect>] [-d string] [-s string] [-l] [-r <regex> | -R <case-insensitive regex>]\n");
   printf ("       [-P string] [-m <min_pg_size>:<max_pg_size>] [-4|-6] [-N] [-M <age>]\n");
-  printf ("       [-A string] [-k string] [-S <version>] [--sni]\n");
+  printf ("       [-A string] [-k string] [-S <version>] [--sni] [--haproxy-protocol]\n");
   printf ("       [-T <content-type>] [-j method]\n");
   printf ("       [--http-version=<version>] [--enable-automatic-decompression]\n");
   printf ("       [--cookie-jar=<cookie jar file>\n");
@@ -2151,8 +2205,6 @@ print_usage (void)
   printf ("%s\n", _("In the first form, make an HTTP request."));
   printf ("%s\n\n", _("In the second form, connect to the server and check the TLS certificate."));
 #endif
-  printf ("%s\n", _("WARNING: check_curl is experimental. Please use"));
-  printf ("%s\n\n", _("check_http if you need a stable version."));
 }
 
 void
@@ -2171,8 +2223,7 @@ curlhelp_initwritebuffer (curlhelp_write_curlbuf *buf)
   return 0;
 }
 
-int
-curlhelp_buffer_write_callback (void *buffer, size_t size, size_t nmemb, void *stream)
+size_t curlhelp_buffer_write_callback (void *buffer, size_t size, size_t nmemb, void *stream)
 {
   curlhelp_write_curlbuf *buf = (curlhelp_write_curlbuf *)stream;
 
@@ -2192,8 +2243,7 @@ curlhelp_buffer_write_callback (void *buffer, size_t size, size_t nmemb, void *s
   return (int)(size * nmemb);
 }
 
-int
-curlhelp_buffer_read_callback (void *buffer, size_t size, size_t nmemb, void *stream)
+size_t curlhelp_buffer_read_callback(void *buffer, size_t size, size_t nmemb, void *stream)
 {
   curlhelp_read_curlbuf *buf = (curlhelp_read_curlbuf *)stream;
 
@@ -2366,8 +2416,7 @@ remove_newlines (char *s)
 char *
 get_header_value (const struct phr_header* headers, const size_t nof_headers, const char* header)
 {
-  int i;
-  for( i = 0; i < nof_headers; i++ ) {
+  for(size_t i = 0; i < nof_headers; i++ ) {
     if(headers[i].name != NULL && strncasecmp( header, headers[i].name, max( headers[i].name_len, 4 ) ) == 0 ) {
       return strndup( headers[i].value, headers[i].value_len );
     }
@@ -2390,6 +2439,10 @@ check_document_dates (const curlhelp_write_curlbuf *header_buf, char (*msg)[DEFA
     &status_line.http_major, &status_line.http_minor, &status_line.http_code, &status_line.msg, &msglen,
     headers, &nof_headers, 0);
 
+        if (res == -1) {
+                die (STATE_UNKNOWN, _("HTTP UNKNOWN - Failed to parse Response\n"));
+        }
+
   server_date = get_header_value (headers, nof_headers, "date");
   document_date = get_header_value (headers, nof_headers, "last-modified");
 
@@ -2465,9 +2518,7 @@ check_document_dates (const curlhelp_write_curlbuf *header_buf, char (*msg)[DEFA
 int
 get_content_length (const curlhelp_write_curlbuf* header_buf, const curlhelp_write_curlbuf* body_buf)
 {
-  const char *s;
-  int content_length = 0;
-  char *copy;
+  size_t content_length = 0;
   struct phr_header headers[255];
   size_t nof_headers = 255;
   size_t msglen;
@@ -2478,6 +2529,10 @@ get_content_length (const curlhelp_write_curlbuf* header_buf, const curlhelp_wri
     &status_line.http_major, &status_line.http_minor, &status_line.http_code, &status_line.msg, &msglen,
     headers, &nof_headers, 0);
 
+        if (res == -1) {
+                die (STATE_UNKNOWN, _("HTTP UNKNOWN - Failed to parse Response\n"));
+        }
+
   content_length_s = get_header_value (headers, nof_headers, "content-length");
   if (!content_length_s) {
     return header_buf->buflen + body_buf->buflen;
diff --git a/plugins/check_dbi.c b/plugins/check_dbi.c
index c24ca248..29c85206 100644
--- a/plugins/check_dbi.c
+++ b/plugins/check_dbi.c
@@ -141,7 +141,7 @@ main (int argc, char **argv)
         if (verbose > 2)
                 printf ("Initializing DBI\n");
 
-        dbi_inst *instance_p;
+        dbi_inst *instance_p = { 0 };
 
         if (dbi_initialize_r(NULL, instance_p) < 0) {
                 printf ("UNKNOWN - failed to initialize DBI; possibly you don't have any drivers installed.\n");
diff --git a/plugins/check_dig.c b/plugins/check_dig.c
index 5d85ae26..be7a6101 100644
--- a/plugins/check_dig.c
+++ b/plugins/check_dig.c
@@ -56,7 +56,7 @@ char *expected_address = NULL;
 char *dns_server = NULL;
 char *dig_args = "";
 char *query_transport = "";
-int verbose = FALSE;
+bool verbose = false;
 int server_port = DEFAULT_PORT;
 int number_tries = DEFAULT_TRIES;
 double warning_interval = UNDEFINED;
@@ -176,11 +176,11 @@ main (int argc, char **argv)
           state_text (result), elapsed_time,
           msg ? msg : _("Probably a non-existent host/domain"),
           fperfdata("time", elapsed_time, "s",
-                    (warning_interval>UNDEFINED?TRUE:FALSE),
+                    (warning_interval>UNDEFINED ? true:false),
                     warning_interval,
-                    (critical_interval>UNDEFINED?TRUE:FALSE),
+                    (critical_interval>UNDEFINED ? true:false),
             critical_interval,
-            TRUE, 0, FALSE, 0));
+            true, 0, false, 0));
   return result;
 }
 
@@ -270,7 +270,7 @@ process_arguments (int argc, char **argv)
       dig_args = strdup(optarg);
       break;
     case 'v':                 /* verbose */
-      verbose = TRUE;
+      verbose = true;
       break;
     case 'T':
       record_type = optarg;
diff --git a/plugins/check_disk.c b/plugins/check_disk.c
index 05e55022..b3dd301c 100644
--- a/plugins/check_disk.c
+++ b/plugins/check_disk.c
@@ -46,7 +46,7 @@ const char *email = "devel@monitoring-plugins.org";
 #include <stdarg.h>
 #include "fsusage.h"
 #include "mountlist.h"
-#include "intprops.h"    /* necessary for TYPE_MAXIMUM */
+#include <float.h>
 #if HAVE_LIMITS_H
 # include <limits.h>
 #endif
@@ -93,11 +93,11 @@ static int stat_remote_fs = 0;
 
 /* Linked list of filesystem types to omit.
    If the list is empty, don't exclude any types.  */
-static struct name_list *fs_exclude_list;
+static struct regex_list *fs_exclude_list = NULL;
 
 /* Linked list of filesystem types to check.
    If the list is empty, include all types.  */
-static struct name_list *fs_include_list;
+static struct regex_list *fs_include_list;
 
 static struct name_list *dp_exclude_list;
 
@@ -112,52 +112,48 @@ enum
 {
   SYNC_OPTION = CHAR_MAX + 1,
   NO_SYNC_OPTION,
-  BLOCK_SIZE_OPTION,
-  IGNORE_MISSING
+  BLOCK_SIZE_OPTION
 };
 
 #ifdef _AIX
 #pragma alloca
 #endif
 
-int process_arguments (int, char **);
-void print_path (const char *mypath);
-void set_all_thresholds (struct parameter_list *path);
-int validate_arguments (uintmax_t, uintmax_t, double, double, double, double, char *);
-void print_help (void);
+static int process_arguments (int, char **);
+static void set_all_thresholds (struct parameter_list *path);
+static void print_help (void);
 void print_usage (void);
-double calculate_percent(uintmax_t, uintmax_t);
-bool stat_path (struct parameter_list *p);
-void get_stats (struct parameter_list *p, struct fs_usage *fsp);
-void get_path_stats (struct parameter_list *p, struct fs_usage *fsp);
-
-char *exclude_device;
-char *units;
-uintmax_t mult = 1024 * 1024;
-int verbose = 0;
-int erronly = FALSE;
-int display_mntp = FALSE;
-int exact_match = FALSE;
-bool ignore_missing = false;
-int freespace_ignore_reserved = FALSE;
-int display_inodes_perfdata = FALSE;
-char *warn_freespace_units = NULL;
-char *crit_freespace_units = NULL;
-char *warn_freespace_percent = NULL;
-char *crit_freespace_percent = NULL;
-char *warn_usedspace_units = NULL;
-char *crit_usedspace_units = NULL;
-char *warn_usedspace_percent = NULL;
-char *crit_usedspace_percent = NULL;
-char *warn_usedinodes_percent = NULL;
-char *crit_usedinodes_percent = NULL;
-char *warn_freeinodes_percent = NULL;
-char *crit_freeinodes_percent = NULL;
-int path_selected = FALSE;
-bool path_ignored = false;
-char *group = NULL;
-struct stat *stat_buf;
-struct name_list *seen = NULL;
+static double calculate_percent(uintmax_t, uintmax_t);
+static bool stat_path (struct parameter_list *p);
+static void get_stats (struct parameter_list *p, struct fs_usage *fsp);
+static void get_path_stats (struct parameter_list *p, struct fs_usage *fsp);
+
+static char *units;
+static uintmax_t mult = 1024 * 1024;
+static int verbose = 0;
+static bool erronly = false;
+static bool display_mntp = false;
+static bool exact_match = false;
+static bool ignore_missing = false;
+static bool freespace_ignore_reserved = false;
+static bool display_inodes_perfdata = false;
+static char *warn_freespace_units = NULL;
+static char *crit_freespace_units = NULL;
+static char *warn_freespace_percent = NULL;
+static char *crit_freespace_percent = NULL;
+static char *warn_usedspace_units = NULL;
+static char *crit_usedspace_units = NULL;
+static char *warn_usedspace_percent = NULL;
+static char *crit_usedspace_percent = NULL;
+static char *warn_usedinodes_percent = NULL;
+static char *crit_usedinodes_percent = NULL;
+static char *warn_freeinodes_percent = NULL;
+static char *crit_freeinodes_percent = NULL;
+static bool path_selected = false;
+static bool path_ignored = false;
+static char *group = NULL;
+static struct stat *stat_buf;
+static struct name_list *seen = NULL;
 
 
 int
@@ -205,7 +201,7 @@ main (int argc, char **argv)
   /* If a list of paths has not been selected, find entire
      mount list and create list of paths
    */
-  if (path_selected == FALSE && path_ignored == false) {
+  if (path_selected == false && path_ignored == false) {
     for (me = mount_list; me; me = me->me_next) {
       if (! (path = np_find_parameter(path_select_list, me->me_mountdir))) {
         path = np_add_parameter(&path_select_list, me->me_mountdir);
@@ -300,7 +296,7 @@ main (int argc, char **argv)
       } else if (me->me_dummy && !show_all_fs) {
         continue;
       /* Skip excluded fstypes */
-      } else if (fs_exclude_list && np_find_name (fs_exclude_list, me->me_type)) {
+      } else if (fs_exclude_list && np_find_regmatch (fs_exclude_list, me->me_type)) {
         continue;
       /* Skip excluded fs's */
       } else if (dp_exclude_list &&
@@ -308,7 +304,7 @@ main (int argc, char **argv)
                 np_find_name (dp_exclude_list, me->me_mountdir))) {
         continue;
       /* Skip not included fstypes */
-      } else if (fs_include_list && !np_find_name (fs_include_list, me->me_type)) {
+      } else if (fs_include_list && !np_find_regmatch(fs_include_list, me->me_type)) {
         continue;
       }
     }
@@ -326,7 +322,7 @@ main (int argc, char **argv)
       get_stats (path, &fsp);
 
       if (verbose >= 3) {
-        printf ("For %s, used_pct=%g free_pct=%g used_units=%lu free_units=%lu total_units=%lu used_inodes_pct=%g free_inodes_pct=%g fsp.fsu_blocksize=%lu mult=%lu\n",
+        printf ("For %s, used_pct=%f free_pct=%f used_units=%lu free_units=%lu total_units=%lu used_inodes_pct=%f free_inodes_pct=%f fsp.fsu_blocksize=%lu mult=%lu\n",
                 me->me_mountdir,
                 path->dused_pct,
                 path->dfree_pct,
@@ -396,10 +392,10 @@ main (int argc, char **argv)
               perfdata_uint64 (
                   (!strcmp(me->me_mountdir, "none") || display_mntp) ? me->me_devname : me->me_mountdir,
                   path->dused_units * mult, "B",
-                  (warning_high_tide == UINT64_MAX ? FALSE : TRUE), warning_high_tide,
-                  (critical_high_tide == UINT64_MAX ? FALSE : TRUE), critical_high_tide,
-                  TRUE, 0,
-                  TRUE, path->dtotal_units * mult));
+                  (warning_high_tide == UINT64_MAX ? false : true), warning_high_tide,
+                  (critical_high_tide == UINT64_MAX ? false : true), critical_high_tide,
+                  true, 0,
+                  true, path->dtotal_units * mult));
 
       if (display_inodes_perfdata) {
         /* *_high_tide must be reinitialized at each run */
@@ -418,10 +414,10 @@ main (int argc, char **argv)
         xasprintf (&perf, "%s %s", perf,
                 perfdata_uint64 (perf_ilabel,
                     path->inodes_used, "",
-                    (warning_high_tide != UINT64_MAX ? TRUE : FALSE), warning_high_tide,
-                    (critical_high_tide != UINT64_MAX ? TRUE : FALSE), critical_high_tide,
-                    TRUE, 0,
-                    TRUE, path->inodes_total));
+                    (warning_high_tide != UINT64_MAX ? true : false), warning_high_tide,
+                    (critical_high_tide != UINT64_MAX ? true : false), critical_high_tide,
+                    true, 0,
+                    true, path->inodes_total));
       }
 
       if (disk_result==STATE_OK && erronly && !verbose)
@@ -432,7 +428,7 @@ main (int argc, char **argv)
           } else {
                   xasprintf(&flag_header, "");
           }
-          xasprintf (&output, "%s%s %s %llu%s (%.0f%%",
+          xasprintf (&output, "%s%s %s %llu%s (%.1f%%",
                           output, flag_header,
                           (!strcmp(me->me_mountdir, "none") || display_mntp) ? me->me_devname : me->me_mountdir,
                           path->dfree_units,
@@ -452,7 +448,7 @@ main (int argc, char **argv)
 
   if (strcmp(output, "") == 0 && ! erronly) {
     preamble = "";
-    xasprintf (&output, " - No disks were found for provided parameters;");
+    xasprintf (&output, " - No disks were found for provided parameters");
   }
 
   printf ("DISK %s%s%s%s%s|%s\n", state_text (result), ((erronly && result==STATE_OK)) ? "" : preamble, output, (strcmp(ignored, "") == 0) ? "" : ignored_preamble, ignored, perf);
@@ -462,24 +458,8 @@ main (int argc, char **argv)
 
 double calculate_percent(uintmax_t value, uintmax_t total) {
   double pct = -1;
-  /* I don't understand the below, but it is taken from coreutils' df */
-  /* Seems to be calculating pct, in the best possible way */
-  if (value <= TYPE_MAXIMUM(uintmax_t) / 100
-    && total != 0) {
-    uintmax_t u100 = value * 100;
-    pct = u100 / total + (u100 % total != 0);
-  } else {
-    /* Possible rounding errors - see coreutils' df for more explanation */
-    double u = value;
-    double t = total;
-    if (t) {
-      long int lipct = pct = u * 100 / t;
-      double ipct = lipct;
-
-      /* Like 'pct = ceil (dpct);', but without ceil - from coreutils again */
-      if (ipct - 1 < pct && pct <= ipct + 1)
-        pct = ipct + (ipct < pct);
-    }
+  if(value <= DBL_MAX && total != 0) {
+    pct = (double)value / total * 100.0;
   }
   return pct;
 }
@@ -524,7 +504,7 @@ process_arguments (int argc, char **argv)
     {"ignore-ereg-partition", required_argument, 0, 'i'},
     {"ignore-eregi-path", required_argument, 0, 'I'},
     {"ignore-eregi-partition", required_argument, 0, 'I'},
-    {"ignore-missing", no_argument, 0, IGNORE_MISSING},
+    {"ignore-missing", no_argument, 0, 'n'},
     {"local", no_argument, 0, 'l'},
     {"stat-remote-fs", no_argument, 0, 'L'},
     {"iperfdata", no_argument, 0, 'P'},
@@ -543,14 +523,14 @@ process_arguments (int argc, char **argv)
   if (argc < 2)
     return ERROR;
 
-  np_add_name(&fs_exclude_list, "iso9660");
+  np_add_regex(&fs_exclude_list, "iso9660", REG_EXTENDED);
 
   for (c = 1; c < argc; c++)
     if (strcmp ("-to", argv[c]) == 0)
       strcpy (argv[c], "-t");
 
   while (1) {
-    c = getopt_long (argc, argv, "+?VqhvefCt:c:w:K:W:u:p:x:X:N:mklLPg:R:r:i:I:MEA", longopts, &option);
+    c = getopt_long (argc, argv, "+?VqhvefCt:c:w:K:W:u:p:x:X:N:mklLPg:R:r:i:I:MEAn", longopts, &option);
 
     if (c == -1 || c == EOF)
       break;
@@ -567,6 +547,10 @@ process_arguments (int argc, char **argv)
 
     /* See comments for 'c' */
     case 'w':                 /* warning threshold */
+                        if (!is_percentage_expression(optarg) && !is_numeric(optarg)) {
+                                        die(STATE_UNKNOWN, "Argument for --warning invalid or missing: %s\n", optarg);
+                        }
+
       if (strstr(optarg, "%")) {
         if (*optarg == '@') {
           warn_freespace_percent = optarg;
@@ -588,6 +572,10 @@ process_arguments (int argc, char **argv)
        force @ at the beginning of the range, so that it is backwards compatible
     */
     case 'c':                 /* critical threshold */
+                        if (!is_percentage_expression(optarg) && !is_numeric(optarg)) {
+                                        die(STATE_UNKNOWN, "Argument for --critical invalid or missing: %s\n", optarg);
+                        }
+
       if (strstr(optarg, "%")) {
         if (*optarg == '@') {
           crit_freespace_percent = optarg;
@@ -710,34 +698,42 @@ process_arguments (int argc, char **argv)
       mount_list = read_file_system_list (0);
       np_set_best_match(se, mount_list, exact_match);
 
-      path_selected = TRUE;
+      path_selected = true;
       break;
     case 'x':                 /* exclude path or partition */
       np_add_name(&dp_exclude_list, optarg);
       break;
     case 'X':                 /* exclude file system type */
-      np_add_name(&fs_exclude_list, optarg);
+      err = np_add_regex(&fs_exclude_list, optarg, REG_EXTENDED);
+      if (err != 0) {
+        regerror (err, &fs_exclude_list->regex, errbuf, MAX_INPUT_BUFFER);
+        die (STATE_UNKNOWN, "DISK %s: %s - %s\n",_("UNKNOWN"), _("Could not compile regular expression"), errbuf);
+      }
       break;
     case 'N':                 /* include file system type */
-      np_add_name(&fs_include_list, optarg);
+      err = np_add_regex(&fs_include_list, optarg, REG_EXTENDED);
+      if (err != 0) {
+        regerror (err, &fs_exclude_list->regex, errbuf, MAX_INPUT_BUFFER);
+        die (STATE_UNKNOWN, "DISK %s: %s - %s\n",_("UNKNOWN"), _("Could not compile regular expression"), errbuf);
+      }
       break;
     case 'v':                 /* verbose */
       verbose++;
       break;
     case 'q':                 /* TODO: this function should eventually go away (removed 2007-09-20) */
       /* verbose--; **replaced by line below**. -q was only a broken way of implementing -e */
-      erronly = TRUE;
+      erronly = true;
       break;
     case 'e':
-      erronly = TRUE;
+      erronly = true;
       break;
     case 'E':
       if (path_selected)
         die (STATE_UNKNOWN, "DISK %s: %s", _("UNKNOWN"), _("Must set -E before selecting paths\n"));
-      exact_match = TRUE;
+      exact_match = true;
       break;
     case 'f':
-      freespace_ignore_reserved = TRUE;
+      freespace_ignore_reserved = true;
       break;
     case 'g':
       if (path_selected)
@@ -784,7 +780,7 @@ process_arguments (int argc, char **argv)
       cflags = default_cflags;
       break;
 
-    case IGNORE_MISSING:
+    case 'n':
       ignore_missing = true;
       break;
     case 'A':
@@ -798,7 +794,7 @@ process_arguments (int argc, char **argv)
              crit_freespace_percent || warn_usedspace_units || crit_usedspace_units ||
              warn_usedspace_percent || crit_usedspace_percent || warn_usedinodes_percent ||
              crit_usedinodes_percent || warn_freeinodes_percent || crit_freeinodes_percent )) {
-        die (STATE_UNKNOWN, "DISK %s: %s", _("UNKNOWN"), _("Must set a threshold value before using -r/-R\n"));
+        die (STATE_UNKNOWN, "DISK %s: %s", _("UNKNOWN"), _("Must set a threshold value before using -r/-R/-A (--ereg-path/--eregi-path/--all)\n"));
       }
 
       err = regcomp(&re, optarg, cflags);
@@ -809,7 +805,7 @@ process_arguments (int argc, char **argv)
 
       for (me = mount_list; me; me = me->me_next) {
         if (np_regex_match_mount_entry(me, &re)) {
-          fnd = TRUE;
+          fnd = true;
           if (verbose >= 3)
             printf("%s %s matching expression %s\n", me->me_devname, me->me_mountdir, optarg);
 
@@ -824,24 +820,24 @@ process_arguments (int argc, char **argv)
 
       if (!fnd && ignore_missing == true) {
         path_ignored = true;
-        /* path_selected = TRUE;*/
+        path_selected = true;
         break;
       } else if (!fnd)
         die (STATE_UNKNOWN, "DISK %s: %s - %s\n",_("UNKNOWN"),
             _("Regular expression did not match any path or disk"), optarg);
 
-      fnd = FALSE;
-      path_selected = TRUE;
+      fnd = false;
+      path_selected = true;
       np_set_best_match(path_select_list, mount_list, exact_match);
       cflags = default_cflags;
 
       break;
     case 'M': /* display mountpoint */
-      display_mntp = TRUE;
+      display_mntp = true;
       break;
     case 'C':
        /* add all mount entries to path_select list if no partitions have been explicitly defined using -p */
-       if (path_selected == FALSE) {
+       if (path_selected == false) {
          struct parameter_list *path;
          for (me = mount_list; me; me = me->me_next) {
            if (! (path = np_find_parameter(path_select_list, me->me_mountdir)))
@@ -864,7 +860,7 @@ process_arguments (int argc, char **argv)
       warn_freeinodes_percent = NULL;
       crit_freeinodes_percent = NULL;
 
-      path_selected = FALSE;
+      path_selected = false;
       group = NULL;
       break;
     case 'V':                 /* version */
@@ -888,7 +884,7 @@ process_arguments (int argc, char **argv)
 
   if (argc > c) {
     se = np_add_parameter(&path_select_list, strdup(argv[c++]));
-    path_selected = TRUE;
+    path_selected = true;
     set_all_thresholds(se);
   }
 
@@ -897,21 +893,9 @@ process_arguments (int argc, char **argv)
     mult = (uintmax_t)1024 * 1024;
   }
 
-  return TRUE;
-}
-
-
-
-void
-print_path (const char *mypath)
-{
-  if (mypath == NULL)
-    printf ("\n");
-  else
-    printf (_(" for %s\n"), mypath);
+  return true;
 }
 
-
 void
 set_all_thresholds (struct parameter_list *path)
 {
@@ -996,25 +980,33 @@ print_help (void)
   printf ("    %s\n", _("Regular expression to ignore selected path/partition (case insensitive) (may be repeated)"));
   printf (" %s\n", "-i, --ignore-ereg-path=PATH, --ignore-ereg-partition=PARTITION");
   printf ("    %s\n", _("Regular expression to ignore selected path or partition (may be repeated)"));
-  printf (" %s\n", "--ignore-missing");
+  printf (" %s\n", "-n, --ignore-missing");
   printf ("    %s\n", _("Return OK if no filesystem matches, filesystem does not exist or is inaccessible."));
   printf ("    %s\n", _("(Provide this option before -p / -r / --ereg-path if used)"));
   printf (UT_PLUG_TIMEOUT, DEFAULT_SOCKET_TIMEOUT);
   printf (" %s\n", "-u, --units=STRING");
   printf ("    %s\n", _("Choose bytes, kB, MB, GB, TB (default: MB)"));
   printf (UT_VERBOSE);
-  printf (" %s\n", "-X, --exclude-type=TYPE");
-  printf ("    %s\n", _("Ignore all filesystems of indicated type (may be repeated)"));
-  printf (" %s\n", "-N, --include-type=TYPE");
-  printf ("    %s\n", _("Check only filesystems of indicated type (may be repeated)"));
+  printf (" %s\n", "-X, --exclude-type=TYPE_REGEX");
+  printf ("    %s\n", _("Ignore all filesystems of types matching given regex(7) (may be repeated)"));
+  printf (" %s\n", "-N, --include-type=TYPE_REGEX");
+  printf ("    %s\n", _("Check only filesystems where the type matches this given regex(7) (may be repeated)"));
+
+  printf ("\n");
+  printf ("%s\n", _("General usage hints:"));
+  printf (" %s\n", _("- Arguments are positional! \"-w 5 -c 1 -p /foo -w6 -c2 -p /bar\" is not the same as"));
+  printf ("   %s\n", _("\"-w 5 -c 1 -p /bar w6 -c2 -p /foo\"."));
+  printf (" %s\n", _("- The syntax is broadly: \"{thresholds a} {paths a} -C {thresholds b} {thresholds b} ...\""));
+
+
 
   printf ("\n");
   printf ("%s\n", _("Examples:"));
   printf (" %s\n", "check_disk -w 10% -c 5% -p /tmp -p /var -C -w 100000 -c 50000 -p /");
-  printf ("    %s\n", _("Checks /tmp and /var at 10% and 5%, and / at 100MB and 50MB"));
+  printf ("    %s\n\n", _("Checks /tmp and /var at 10% and 5%, and / at 100MB and 50MB"));
   printf (" %s\n", "check_disk -w 100 -c 50 -C -w 1000 -c 500 -g sidDATA -r '^/oracle/SID/data.*$'");
   printf ("    %s\n", _("Checks all filesystems not matching -r at 100M and 50M. The fs matching the -r regex"));
-  printf ("    %s\n", _("are grouped which means the freespace thresholds are applied to all disks together"));
+  printf ("    %s\n\n", _("are grouped which means the freespace thresholds are applied to all disks together"));
   printf (" %s\n", "check_disk -w 100 -c 50 -C -w 1000 -c 500 -p /foo -C -w 5% -c 3% -p /bar");
   printf ("    %s\n", _("Checks /foo for 1000M/500M and /bar for 5/3%. All remaining volumes use 100M/50M"));
 
@@ -1027,9 +1019,9 @@ void
 print_usage (void)
 {
   printf ("%s\n", _("Usage:"));
-  printf (" %s {-w absolute_limit |-w  percentage_limit% | -W inode_percentage_limit } {-c absolute_limit|-c percentage_limit% | -K inode_percentage_limit } {-p path | -x device}\n", progname);
+  printf (" %s {-w absolute_limit |-w  percentage_limit%% | -W inode_percentage_limit } {-c absolute_limit|-c percentage_limit%% | -K inode_percentage_limit } {-p path | -x device}\n", progname);
   printf ("[-C] [-E] [-e] [-f] [-g group ] [-k] [-l] [-M] [-m] [-R path ] [-r path ]\n");
-  printf ("[-t timeout] [-u unit] [-v] [-X type] [-N type]\n");
+  printf ("[-t timeout] [-u unit] [-v] [-X type_regex] [-N type]\n");
 }
 
 bool
@@ -1115,7 +1107,7 @@ get_stats (struct parameter_list *p, struct fs_usage *fsp) {
   }
   /* finally calculate percentages for either plain FS or summed up group */
   p->dused_pct = calculate_percent( p->used, p->used + p->available );    /* used + available can never be > uintmax */
-  p->dfree_pct = 100 - p->dused_pct;
+  p->dfree_pct = 100.0 - p->dused_pct;
   p->dused_inodes_percent = calculate_percent(p->inodes_total - p->inodes_free, p->inodes_total);
   p->dfree_inodes_percent = 100 - p->dused_inodes_percent;
 
diff --git a/plugins/check_dns.c b/plugins/check_dns.c
index 7ffce98b..468bc958 100644
--- a/plugins/check_dns.c
+++ b/plugins/check_dns.c
@@ -41,8 +41,8 @@ const char *email = "devel@monitoring-plugins.org";
 
 int process_arguments (int, char **);
 int validate_arguments (void);
-int error_scan (char *, int *);
-int ip_match_cidr(const char *, const char *);
+int error_scan (char *, bool *);
+bool ip_match_cidr(const char *, const char *);
 unsigned long ip2long(const char *);
 void print_help (void);
 void print_usage (void);
@@ -51,13 +51,13 @@ void print_usage (void);
 char query_address[ADDRESS_LENGTH] = "";
 char dns_server[ADDRESS_LENGTH] = "";
 char ptr_server[ADDRESS_LENGTH] = "";
-int verbose = FALSE;
+bool verbose = false;
 char **expected_address = NULL;
 int expected_address_cnt = 0;
-int expect_nxdomain = FALSE;
+bool expect_nxdomain = false;
 
-int expect_authority = FALSE;
-int all_match = FALSE;
+bool expect_authority = false;
+bool all_match = false;
 thresholds *time_thresholds = NULL;
 
 static int
@@ -80,15 +80,14 @@ main (int argc, char **argv)
   int n_addresses = 0;
   char *msg = NULL;
   char *temp_buffer = NULL;
-  int non_authoritative = FALSE;
+  bool non_authoritative = false;
   int result = STATE_UNKNOWN;
   double elapsed_time;
   long microsec;
   struct timeval tv;
-  int parse_address = FALSE; /* This flag scans for Address: but only after Name: */
+  bool parse_address = false; /* This flag scans for Address: but only after Name: */
   output chld_out, chld_err;
-  size_t i;
-  int is_nxdomain = FALSE;
+  bool is_nxdomain = false;
 
   setlocale (LC_ALL, "");
   bindtextdomain (PACKAGE, LOCALEDIR);
@@ -122,7 +121,7 @@ main (int argc, char **argv)
   }
 
   /* scan stdout */
-  for(i = 0; i < chld_out.lines; i++) {
+  for(size_t i = 0; i < chld_out.lines; i++) {
     if (addresses == NULL)
       addresses = malloc(sizeof(*addresses)*10);
     else if (!(n_addresses % 10))
@@ -164,8 +163,8 @@ main (int argc, char **argv)
 
     /* the server is responding, we just got the host name... */
     if (strstr (chld_out.line[i], "Name:"))
-      parse_address = TRUE;
-    else if (parse_address == TRUE && (strstr (chld_out.line[i], "Address:") ||
+      parse_address = true;
+    else if (parse_address && (strstr (chld_out.line[i], "Address:") ||
              strstr (chld_out.line[i], "Addresses:"))) {
       temp_buffer = index (chld_out.line[i], ':');
       temp_buffer++;
@@ -184,7 +183,7 @@ main (int argc, char **argv)
       addresses[n_addresses++] = strdup(temp_buffer);
     }
     else if (strstr (chld_out.line[i], _("Non-authoritative answer:"))) {
-      non_authoritative = TRUE;
+      non_authoritative = true;
     }
 
 
@@ -197,7 +196,7 @@ main (int argc, char **argv)
   }
 
   /* scan stderr */
-  for(i = 0; i < chld_err.lines; i++) {
+  for(size_t i = 0; i < chld_err.lines; i++) {
     if (verbose)
       puts(chld_err.line[i]);
 
@@ -241,7 +240,7 @@ main (int argc, char **argv)
     unsigned long expect_match = (1 << expected_address_cnt) - 1;
     unsigned long addr_match = (1 << n_addresses) - 1;
 
-    for (i=0; i<expected_address_cnt; i++) {
+    for (int i=0; i<expected_address_cnt; i++) {
       int j;
       /* check if we get a match on 'raw' ip or cidr */
       for (j=0; j<n_addresses; j++) {
@@ -298,21 +297,21 @@ main (int argc, char **argv)
     printf (_(". %s returns %s"), query_address, address);
     if ((time_thresholds->warning != NULL) && (time_thresholds->critical != NULL)) {
       printf ("|%s\n", fperfdata ("time", elapsed_time, "s",
-                                  TRUE, time_thresholds->warning->end,
-                                  TRUE, time_thresholds->critical->end,
-                                  TRUE, 0, FALSE, 0));
+                                  true, time_thresholds->warning->end,
+                                  true, time_thresholds->critical->end,
+                                  true, 0, false, 0));
     } else if ((time_thresholds->warning == NULL) && (time_thresholds->critical != NULL)) {
       printf ("|%s\n", fperfdata ("time", elapsed_time, "s",
-                                  FALSE, 0,
-                                  TRUE, time_thresholds->critical->end,
-                                  TRUE, 0, FALSE, 0));
+                                  false, 0,
+                                  true, time_thresholds->critical->end,
+                                  true, 0, false, 0));
     } else if ((time_thresholds->warning != NULL) && (time_thresholds->critical == NULL)) {
       printf ("|%s\n", fperfdata ("time", elapsed_time, "s",
-                                  TRUE, time_thresholds->warning->end,
-                                  FALSE, 0,
-                                  TRUE, 0, FALSE, 0));
+                                  true, time_thresholds->warning->end,
+                                  false, 0,
+                                  true, 0, false, 0));
     } else
-      printf ("|%s\n", fperfdata ("time", elapsed_time, "s", FALSE, 0, FALSE, 0, TRUE, 0, FALSE, 0));
+      printf ("|%s\n", fperfdata ("time", elapsed_time, "s", false, 0, false, 0, true, 0, false, 0));
   }
   else if (result == STATE_WARNING)
     printf (_("DNS WARNING - %s\n"),
@@ -327,15 +326,14 @@ main (int argc, char **argv)
   return result;
 }
 
-int
-ip_match_cidr(const char *addr, const char *cidr_ro)
-{
+bool ip_match_cidr(const char *addr, const char *cidr_ro) {
   char *subnet, *mask_c, *cidr = strdup(cidr_ro);
   int mask;
   subnet = strtok(cidr, "/");
   mask_c = strtok(NULL, "\0");
-  if (!subnet || !mask_c)
-    return FALSE;
+  if (!subnet || !mask_c) {
+    return false;
+        }
   mask = atoi(mask_c);
 
   /* https://www.cryptobells.com/verifying-ips-in-a-subnet-in-php/ */
@@ -355,14 +353,14 @@ ip2long(const char* src) {
 }
 
 int
-error_scan (char *input_buffer, int *is_nxdomain)
+error_scan (char *input_buffer, bool *is_nxdomain)
 {
 
   const int nxdomain = strstr (input_buffer, "Non-existent") ||
                        strstr (input_buffer, "** server can't find") ||
                        strstr (input_buffer, "** Can't find") ||
                        strstr (input_buffer, "NXDOMAIN");
-  if (nxdomain) *is_nxdomain = TRUE;
+  if (nxdomain) *is_nxdomain = true;
 
   /* the DNS lookup timed out */
   if (strstr (input_buffer, _("Note: nslookup is deprecated and may be removed from future releases.")) ||
@@ -461,7 +459,7 @@ process_arguments (int argc, char **argv)
       print_revision (progname, NP_VERSION);
       exit (STATE_UNKNOWN);
     case 'v': /* version */
-      verbose = TRUE;
+      verbose = true;
       break;
     case 't': /* timeout period */
       timeout_interval = atoi (optarg);
@@ -508,13 +506,13 @@ process_arguments (int argc, char **argv)
       }
       break;
     case 'n': /* expect NXDOMAIN */
-      expect_nxdomain = TRUE;
+      expect_nxdomain = true;
       break;
     case 'A': /* expect authority */
-      expect_authority = TRUE;
+      expect_authority = true;
       break;
     case 'L': /* all must match */
-      all_match = TRUE;
+      all_match = true;
       break;
     case 'w':
       warning = optarg;
diff --git a/plugins/check_fping.c b/plugins/check_fping.c
index 23a9e990..70d6f9fc 100644
--- a/plugins/check_fping.c
+++ b/plugins/check_fping.c
@@ -59,16 +59,16 @@ int packet_size = PACKET_SIZE;
 int packet_count = PACKET_COUNT;
 int target_timeout = 0;
 int packet_interval = 0;
-int verbose = FALSE;
+bool verbose = false;
 int cpl;
 int wpl;
 double crta;
 double wrta;
-int cpl_p = FALSE;
-int wpl_p = FALSE;
-bool alive_p = FALSE;
-int crta_p = FALSE;
-int wrta_p = FALSE;
+bool cpl_p = false;
+bool wpl_p = false;
+bool alive_p = false;
+bool crta_p = false;
+bool wrta_p = false;
 
 int
 main (int argc, char **argv)
@@ -194,8 +194,8 @@ int textscan (char *buf) {
          _("FPING %s - %s (rta=%f ms)|%s\n"),
          state_text (STATE_OK), server_name,rta,
                  /* No loss since we only waited for the first reply
-         perfdata ("loss", (long int)loss, "%", wpl_p, wpl, cpl_p, cpl, TRUE, 0, TRUE, 100), */
-         fperfdata ("rta", rta/1.0e3, "s", wrta_p, wrta/1.0e3, crta_p, crta/1.0e3, TRUE, 0, FALSE, 0));
+         perfdata ("loss", (long int)loss, "%", wpl_p, wpl, cpl_p, cpl, true, 0, true, 100), */
+         fperfdata ("rta", rta/1.0e3, "s", wrta_p, wrta/1.0e3, crta_p, crta/1.0e3, true, 0, false, 0));
   }
 
   if (strstr (buf, "not found")) {
@@ -228,21 +228,21 @@ int textscan (char *buf) {
     rtastr = 1 + index (rtastr, '/');
     loss = strtod (losstr, NULL);
     rta = strtod (rtastr, NULL);
-    if (cpl_p == TRUE && loss > cpl)
+    if (cpl_p && loss > cpl)
       status = STATE_CRITICAL;
-    else if (crta_p == TRUE  && rta > crta)
+    else if (crta_p && rta > crta)
       status = STATE_CRITICAL;
-    else if (wpl_p == TRUE && loss > wpl)
+    else if (wpl_p && loss > wpl)
       status = STATE_WARNING;
-    else if (wrta_p == TRUE && rta > wrta)
+    else if (wrta_p && rta > wrta)
       status = STATE_WARNING;
     else
       status = STATE_OK;
     die (status,
           _("FPING %s - %s (loss=%.0f%%, rta=%f ms)|%s %s\n"),
          state_text (status), server_name, loss, rta,
-         perfdata ("loss", (long int)loss, "%", wpl_p, wpl, cpl_p, cpl, TRUE, 0, TRUE, 100),
-         fperfdata ("rta", rta/1.0e3, "s", wrta_p, wrta/1.0e3, crta_p, crta/1.0e3, TRUE, 0, FALSE, 0));
+         perfdata ("loss", (long int)loss, "%", wpl_p, wpl, cpl_p, cpl, true, 0, true, 100),
+         fperfdata ("rta", rta/1.0e3, "s", wrta_p, wrta/1.0e3, crta_p, crta/1.0e3, true, 0, false, 0));
 
   }
   else if(strstr (buf, "xmt/rcv/%loss") ) {
@@ -258,16 +258,16 @@ int textscan (char *buf) {
     loss = strtod (losstr, NULL);
     if (atoi(losstr) == 100)
       status = STATE_CRITICAL;
-    else if (cpl_p == TRUE && loss > cpl)
+    else if (cpl_p && loss > cpl)
       status = STATE_CRITICAL;
-    else if (wpl_p == TRUE && loss > wpl)
+    else if (wpl_p && loss > wpl)
       status = STATE_WARNING;
     else
       status = STATE_OK;
     /* loss=%.0f%%;%d;%d;0;100 */
     die (status, _("FPING %s - %s (loss=%.0f%% )|%s\n"),
          state_text (status), server_name, loss ,
-         perfdata ("loss", (long int)loss, "%", wpl_p, wpl, cpl_p, cpl, TRUE, 0, TRUE, 100));
+         perfdata ("loss", (long int)loss, "%", wpl_p, wpl, cpl_p, cpl, true, 0, true, 100));
 
   }
   else {
@@ -329,7 +329,7 @@ process_arguments (int argc, char **argv)
     case '?':                 /* print short usage statement if args not parsable */
       usage5 ();
     case 'a':                 /* host alive mode */
-      alive_p = TRUE;
+      alive_p = true;
       break;
     case 'h':                 /* help */
       print_help ();
@@ -338,16 +338,16 @@ process_arguments (int argc, char **argv)
       print_revision (progname, NP_VERSION);
       exit (STATE_UNKNOWN);
     case 'v':                 /* verbose mode */
-      verbose = TRUE;
+      verbose = true;
       break;
     case 'H':                 /* hostname */
-      if (is_host (optarg) == FALSE) {
+      if (is_host (optarg) == false) {
         usage2 (_("Invalid hostname/address"), optarg);
       }
       server_name = strscpy (server_name, optarg);
       break;
     case 'S':                 /* sourceip */
-      if (is_host (optarg) == FALSE) {
+      if (is_host (optarg) == false) {
         usage2 (_("Invalid hostname/address"), optarg);
       }
       sourceip = strscpy (sourceip, optarg);
@@ -369,12 +369,12 @@ process_arguments (int argc, char **argv)
       get_threshold (optarg, rv);
       if (rv[RTA]) {
         crta = strtod (rv[RTA], NULL);
-        crta_p = TRUE;
+        crta_p = true;
         rv[RTA] = NULL;
       }
       if (rv[PL]) {
         cpl = atoi (rv[PL]);
-        cpl_p = TRUE;
+        cpl_p = true;
         rv[PL] = NULL;
       }
       break;
@@ -382,12 +382,12 @@ process_arguments (int argc, char **argv)
       get_threshold (optarg, rv);
       if (rv[RTA]) {
         wrta = strtod (rv[RTA], NULL);
-        wrta_p = TRUE;
+        wrta_p = true;
         rv[RTA] = NULL;
       }
       if (rv[PL]) {
         wpl = atoi (rv[PL]);
-        wpl_p = TRUE;
+        wpl_p = true;
         rv[PL] = NULL;
       }
       break;
diff --git a/plugins/check_game.c b/plugins/check_game.c
index a534b69b..ca126973 100644
--- a/plugins/check_game.c
+++ b/plugins/check_game.c
@@ -53,7 +53,7 @@ char *server_ip;
 char *game_type;
 int port = 0;
 
-int verbose;
+bool verbose = false;
 
 int qstat_game_players_max = -1;
 int qstat_game_players = -1;
@@ -90,7 +90,7 @@ main (int argc, char **argv)
   if (port)
     xasprintf (&command_line, "%s:%-d", command_line, port);
 
-  if (verbose > 0)
+  if (verbose)
     printf ("%s\n", command_line);
 
   /* run the command. historically, this plugin ignores output on stderr,
@@ -142,11 +142,11 @@ main (int argc, char **argv)
             ret[qstat_map_field],
             ret[qstat_ping_field],
             perfdata ("players", atol(ret[qstat_game_players]), "",
-                      FALSE, 0, FALSE, 0,
-                      TRUE, 0, TRUE, atol(ret[qstat_game_players_max])),
+                      false, 0, false, 0,
+                      true, 0, true, atol(ret[qstat_game_players_max])),
             fperfdata ("ping", strtod(ret[qstat_ping_field], NULL), "",
-                      FALSE, 0, FALSE, 0,
-                      TRUE, 0, FALSE, 0));
+                      false, 0, false, 0,
+                      true, 0, false, 0));
   }
 
   return result;
@@ -201,7 +201,7 @@ process_arguments (int argc, char **argv)
       print_revision (progname, NP_VERSION);
       exit (STATE_UNKNOWN);
     case 'v': /* version */
-      verbose = TRUE;
+      verbose = true;
       break;
     case 't': /* timeout period */
       timeout_interval = atoi (optarg);
diff --git a/plugins/check_http.c b/plugins/check_http.c
index 718c8ee7..cdf768c9 100644
--- a/plugins/check_http.c
+++ b/plugins/check_http.c
@@ -85,6 +85,7 @@ char errbuf[MAX_INPUT_BUFFER];
 int cflags = REG_NOSUB | REG_EXTENDED | REG_NEWLINE;
 int errcode;
 int invert_regex = 0;
+int state_regex = STATE_CRITICAL;
 
 struct timeval tv;
 struct timeval tv_temp;
@@ -210,7 +211,8 @@ bool process_arguments (int argc, char **argv)
     INVERT_REGEX = CHAR_MAX + 1,
     SNI_OPTION,
     MAX_REDIRS_OPTION,
-    CONTINUE_AFTER_CHECK_CERT
+    CONTINUE_AFTER_CHECK_CERT,
+    STATE_REGEX
   };
 
   int option = 0;
@@ -246,6 +248,7 @@ bool process_arguments (int argc, char **argv)
     {"content-type", required_argument, 0, 'T'},
     {"pagesize", required_argument, 0, 'm'},
     {"invert-regex", no_argument, NULL, INVERT_REGEX},
+    {"state-regex", required_argument, 0, STATE_REGEX},
     {"use-ipv4", no_argument, 0, '4'},
     {"use-ipv6", no_argument, 0, '6'},
     {"extended-perfdata", no_argument, 0, 'E'},
@@ -471,10 +474,9 @@ bool process_arguments (int argc, char **argv)
         free(http_method);
       http_method = strdup (optarg);
       char *tmp;
-      if ((tmp = strstr(http_method, ":")) > 0) {
-        tmp[0] = '\0';
-        http_method = http_method;
-        http_method_proxy = ++tmp;
+      if ((tmp = strstr(http_method, ":")) != NULL) {
+        tmp[0] = '\0'; // set the ":" in the middle to 0
+        http_method_proxy = ++tmp; // this points to the second part
       }
       break;
     case 'd': /* string or substring */
@@ -512,6 +514,13 @@ bool process_arguments (int argc, char **argv)
     case INVERT_REGEX:
       invert_regex = 1;
       break;
+    case STATE_REGEX:
+      if (!strcmp (optarg, "critical"))
+        state_regex = STATE_CRITICAL;
+      else if (!strcmp (optarg, "warning"))
+        state_regex = STATE_WARNING;
+      else usage2 (_("Invalid state-regex option"), optarg);
+      break;
     case '4':
       address_family = AF_INET;
       break;
@@ -1094,7 +1103,7 @@ check_http (void)
       microsec_firstbyte = deltime (tv_temp);
       elapsed_time_firstbyte = (double)microsec_firstbyte / 1.0e6;
     }
-    while (pos = memchr(buffer, '\0', i)) {
+    while ((pos = memchr(buffer, '\0', i))) {
       /* replace nul character with a blank */
       *pos = ' ';
     }
@@ -1318,7 +1327,7 @@ check_http (void)
         xasprintf (&msg, _("%spattern not found, "), msg);
       else
         xasprintf (&msg, _("%spattern found, "), msg);
-      result = STATE_CRITICAL;
+      result = state_regex;
     }
     else {
       /* FIXME: Shouldn't that be UNKNOWN? */
@@ -1775,7 +1784,7 @@ print_help (void)
   printf (" %s\n", "-u, --url=PATH");
   printf ("    %s\n", _("URL to GET or POST (default: /)"));
   printf (" %s\n", "-P, --post=STRING");
-  printf ("    %s\n", _("URL encoded http POST data"));
+  printf ("    %s\n", _("URL decoded http POST data"));
   printf (" %s\n", "-j, --method=STRING  (for example: HEAD, OPTIONS, TRACE, PUT, DELETE, CONNECT, CONNECT:POST)");
   printf ("    %s\n", _("Set HTTP method."));
   printf (" %s\n", "-N, --no-body");
@@ -1794,7 +1803,10 @@ print_help (void)
   printf (" %s\n", "-R, --eregi=STRING");
   printf ("    %s\n", _("Search page for case-insensitive regex STRING"));
   printf (" %s\n", "--invert-regex");
-  printf ("    %s\n", _("Return CRITICAL if found, OK if not\n"));
+  printf ("    %s\n", _("Return STATE if found, OK if not (STATE is CRITICAL, per default)"));
+  printf ("    %s\n", _("can be changed with --state--regex)"));
+  printf (" %s\n", "--regex-state=STATE");
+  printf ("    %s\n", _("Return STATE if regex is found, OK if not\n"));
 
   printf (" %s\n", "-a, --authorization=AUTH_PAIR");
   printf ("    %s\n", _("Username:password on sites with basic authentication"));
diff --git a/plugins/check_ide_smart.c b/plugins/check_ide_smart.c
index 0160d98b..3872e341 100644
--- a/plugins/check_ide_smart.c
+++ b/plugins/check_ide_smart.c
@@ -73,10 +73,6 @@ void print_usage (void);
         
 #define NR_ATTRIBUTES   30
         
-#ifndef TRUE
-#define TRUE 1
-#endif  /*  */
-        
 #define PREFAILURE 2
 #define ADVISORY 1
 #define OPERATIONAL 0
@@ -169,9 +165,9 @@ int smart_read_values (int, values_t *);
 int nagios (values_t *, thresholds_t *);
 void print_value (value_t *, threshold_t *);
 void print_values (values_t *, thresholds_t *);
-int smart_cmd_simple (int, enum SmartCommand, __u8, char);
+int smart_cmd_simple (int, enum SmartCommand, __u8, bool);
 int smart_read_thresholds (int, thresholds_t *);
-int verbose = FALSE;
+bool verbose = false;
 
 int
 main (int argc, char *argv[]) 
@@ -203,7 +199,7 @@ main (int argc, char *argv[])
         bindtextdomain (PACKAGE, LOCALEDIR);
         textdomain (PACKAGE);
 
-        while (1) {
+        while (true) {
                 
                 o = getopt_long (argc, argv, "+d:iq10nhVv", longopts, &longindex);
 
@@ -229,7 +225,7 @@ main (int argc, char *argv[])
                         fprintf (stderr, "%s\n", _("default and will be removed from future releases."));
                         break;
                 case 'v': /* verbose */
-                        verbose = TRUE;
+                        verbose = true;
                         break;
                 case 'h':
                         print_help ();
@@ -258,7 +254,7 @@ main (int argc, char *argv[])
                 return STATE_CRITICAL;
         }
 
-        if (smart_cmd_simple (fd, SMART_CMD_ENABLE, 0, FALSE)) {
+        if (smart_cmd_simple (fd, SMART_CMD_ENABLE, 0, false)) {
                 printf (_("CRITICAL - SMART_CMD_ENABLE\n"));
                 return STATE_CRITICAL;
         }
@@ -447,9 +443,7 @@ print_values (values_t * p, thresholds_t * t)
 }
 
 
-int
-smart_cmd_simple (int fd, enum SmartCommand command, __u8 val0, char show_error) 
-{
+int smart_cmd_simple (int fd, enum SmartCommand command, __u8 val0, bool show_error) {
         int e = STATE_UNKNOWN;
 #ifdef __linux__
         __u8 args[4];
diff --git a/plugins/check_ldap.c b/plugins/check_ldap.c
index a1bfe1be..868ffc1e 100644
--- a/plugins/check_ldap.c
+++ b/plugins/check_ldap.c
@@ -71,9 +71,9 @@ thresholds *entries_thresholds = NULL;
 struct timeval tv;
 char* warn_entries = NULL;
 char* crit_entries = NULL;
-int starttls = FALSE;
-int ssl_on_connect = FALSE;
-int verbose = 0;
+bool starttls = false;
+bool ssl_on_connect = false;
+bool verbose = false;
 
 /* for ldap tls */
 
@@ -97,9 +97,6 @@ main (int argc, char *argv[])
         int tls;
         int version=3;
 
-        /* for entry counting */
-
-        LDAPMessage *next_entry;
         int status_entries = STATE_OK;
         int num_entries = 0;
 
@@ -118,7 +115,7 @@ main (int argc, char *argv[])
                 usage4 (_("Could not parse arguments"));
 
         if (strstr(argv[0],"check_ldaps") && ! starttls && ! ssl_on_connect)
-                starttls = TRUE;
+                starttls = true;
 
         /* initialize alarm signal handling */
         signal (SIGALRM, socket_timeout_alarm_handler);
@@ -256,11 +253,11 @@ main (int argc, char *argv[])
                         fperfdata ("time", elapsed_time, "s",
                                 (int)warn_time, warn_time,
                                 (int)crit_time, crit_time,
-                                TRUE, 0, FALSE, 0),
+                                true, 0, false, 0),
                         sperfdata ("entries", (double)num_entries, "",
                                 warn_entries,
                                 crit_entries,
-                                TRUE, 0.0, FALSE, 0.0));
+                                true, 0.0, false, 0.0));
         } else {
                 printf (_("LDAP %s - %.3f seconds response time|%s\n"),
                         state_text (status),
@@ -268,7 +265,7 @@ main (int argc, char *argv[])
                         fperfdata ("time", elapsed_time, "s",
                                 (int)warn_time, warn_time,
                                 (int)crit_time, crit_time,
-                                TRUE, 0, FALSE, 0));
+                                true, 0, false, 0));
         }
 
         return status;
@@ -316,7 +313,7 @@ process_arguments (int argc, char **argv)
                         strcpy (argv[c], "-t");
         }
 
-        while (1) {
+        while (true) {
                 c = getopt_long (argc, argv, "hvV234TS6t:c:w:H:b:p:a:D:P:C:W:", longopts, &option);
 
                 if (c == -1 || c == EOF)
@@ -377,17 +374,17 @@ process_arguments (int argc, char **argv)
                         address_family = AF_INET;
                         break;
                 case 'v':
-                        verbose++;
+                        verbose = true;
                         break;
                 case 'T':
                         if (! ssl_on_connect)
-                                starttls = TRUE;
+                                starttls = true;
                         else
                                 usage_va(_("%s cannot be combined with %s"), "-T/--starttls", "-S/--ssl");
                         break;
                 case 'S':
                         if (! starttls) {
-                                ssl_on_connect = TRUE;
+                                ssl_on_connect = true;
                                 if (ld_port == -1)
                                         ld_port = LDAPS_PORT;
                         } else
diff --git a/plugins/check_load.c b/plugins/check_load.c
index 313df8ad..1431d130 100644
--- a/plugins/check_load.c
+++ b/plugins/check_load.c
@@ -110,10 +110,6 @@ main (int argc, char **argv)
         double la[3] = { 0.0, 0.0, 0.0 };       /* NetBSD complains about uninitialized arrays */
 #ifndef HAVE_GETLOADAVG
         char input_buffer[MAX_INPUT_BUFFER];
-# ifdef HAVE_PROC_LOADAVG
-        FILE *fp;
-        char *str, *next;
-# endif
 #endif
 
         setlocale (LC_ALL, "");
@@ -132,23 +128,6 @@ main (int argc, char **argv)
         if (result != 3)
                 return STATE_UNKNOWN;
 #else
-# ifdef HAVE_PROC_LOADAVG
-        fp = fopen (PROC_LOADAVG, "r");
-        if (fp == NULL) {
-                printf (_("Error opening %s\n"), PROC_LOADAVG);
-                return STATE_UNKNOWN;
-        }
-
-        while (fgets (input_buffer, MAX_INPUT_BUFFER - 1, fp)) {
-                str = (char *)input_buffer;
-                for(i = 0; i < 3; i++) {
-                        la[i] = strtod(str, &next);
-                        str = next;
-                }
-        }
-
-        fclose (fp);
-# else
         child_process = spopen (PATH_TO_UPTIME);
         if (child_process == NULL) {
                 printf (_("Error opening %s\n"), PATH_TO_UPTIME);
@@ -175,18 +154,13 @@ main (int argc, char **argv)
                 printf (_("Error code %d returned in %s\n"), result, PATH_TO_UPTIME);
                 return STATE_UNKNOWN;
         }
-# endif
 #endif
 
         if ((la[0] < 0.0) || (la[1] < 0.0) || (la[2] < 0.0)) {
 #ifdef HAVE_GETLOADAVG
                 printf (_("Error in getloadavg()\n"));
 #else
-# ifdef HAVE_PROC_LOADAVG
-                printf (_("Error processing %s\n"), PROC_LOADAVG);
-# else
                 printf (_("Error processing %s\n"), PATH_TO_UPTIME);
-# endif
 #endif
                 return STATE_UNKNOWN;
         }
diff --git a/plugins/check_mrtg.c b/plugins/check_mrtg.c
index 1fda5492..826b77e9 100644
--- a/plugins/check_mrtg.c
+++ b/plugins/check_mrtg.c
@@ -43,7 +43,7 @@ void print_usage (void);
 
 char *log_file = NULL;
 int expire_minutes = 0;
-int use_average = TRUE;
+bool use_average = true;
 int variable_number = -1;
 unsigned long value_warning_threshold = 0L;
 unsigned long value_critical_threshold = 0L;
@@ -138,7 +138,7 @@ main (int argc, char **argv)
         }
 
         /* else check the incoming/outgoing rates */
-        if (use_average == TRUE)
+        if (use_average)
                 rate = average_value_rate;
         else
                 rate = maximum_value_rate;
@@ -149,7 +149,7 @@ main (int argc, char **argv)
                 result = STATE_WARNING;
 
         printf("%s. %s = %lu %s|%s\n",
-               (use_average == TRUE) ? _("Avg") : _("Max"),
+               (use_average) ? _("Avg") : _("Max"),
                label, rate, units,
                perfdata(label, (long) rate, units,
                         (int) value_warning_threshold, (long) value_warning_threshold,
@@ -211,9 +211,9 @@ process_arguments (int argc, char **argv)
                         break;
                 case 'a':                                                                       /* port */
                         if (!strcmp (optarg, "MAX"))
-                                use_average = FALSE;
+                                use_average = false;
                         else
-                                use_average = TRUE;
+                                use_average = true;
                         break;
                 case 'v':
                         variable_number = atoi (optarg);
@@ -258,11 +258,11 @@ process_arguments (int argc, char **argv)
         }
 
         if (argc > c && strcmp (argv[c], "MAX") == 0) {
-                use_average = FALSE;
+                use_average = false;
                 c++;
         }
         else if (argc > c && strcmp (argv[c], "AVG") == 0) {
-                use_average = TRUE;
+                use_average = true;
                 c++;
         }
 
diff --git a/plugins/check_mrtgtraf.c b/plugins/check_mrtgtraf.c
index eb66f622..bd25d47d 100644
--- a/plugins/check_mrtgtraf.c
+++ b/plugins/check_mrtgtraf.c
@@ -43,7 +43,7 @@ void print_usage(void);
 
 char *log_file = NULL;
 int expire_minutes = -1;
-int use_average = TRUE;
+bool use_average = true;
 unsigned long incoming_warning_threshold = 0L;
 unsigned long incoming_critical_threshold = 0L;
 unsigned long outgoing_warning_threshold = 0L;
@@ -137,7 +137,7 @@ main (int argc, char **argv)
                      (int) ((current_time - timestamp) / 60));
 
         /* else check the incoming/outgoing rates */
-        if (use_average == TRUE) {
+        if (use_average) {
                 incoming_rate = average_incoming_rate;
                 outgoing_rate = average_outgoing_rate;
         }
@@ -192,17 +192,17 @@ main (int argc, char **argv)
         }
 
         xasprintf (&error_message, _("%s. In = %0.1f %s/s, %s. Out = %0.1f %s/s|%s %s\n"),
-                  (use_average == TRUE) ? _("Avg") : _("Max"), adjusted_incoming_rate,
-                  incoming_speed_rating, (use_average == TRUE) ? _("Avg") : _("Max"),
+                  (use_average) ? _("Avg") : _("Max"), adjusted_incoming_rate,
+                  incoming_speed_rating, (use_average) ? _("Avg") : _("Max"),
                   adjusted_outgoing_rate, outgoing_speed_rating,
                   fperfdata("in", adjusted_incoming_rate, incoming_speed_rating,
                            (int)incoming_warning_threshold, incoming_warning_threshold,
                            (int)incoming_critical_threshold, incoming_critical_threshold,
-                           TRUE, 0, FALSE, 0),
+                           true, 0, false, 0),
                   fperfdata("out", adjusted_outgoing_rate, outgoing_speed_rating,
                            (int)outgoing_warning_threshold, outgoing_warning_threshold,
                            (int)outgoing_critical_threshold, outgoing_critical_threshold,
-                           TRUE, 0, FALSE, 0));
+                           true, 0, false, 0));
 
         printf (_("Traffic %s - %s\n"), state_text(result), error_message);
 
@@ -256,9 +256,9 @@ process_arguments (int argc, char **argv)
                         break;
                 case 'a':                                                                       /* aggregation (AVE or MAX) */
                         if (!strcmp (optarg, "MAX"))
-                                use_average = FALSE;
+                                use_average = false;
                         else
-                                use_average = TRUE;
+                                use_average = true;
                         break;
                 case 'c':                                                                       /* warning threshold */
                         sscanf (optarg, "%lu,%lu", &incoming_critical_threshold,
@@ -289,11 +289,11 @@ process_arguments (int argc, char **argv)
         }
 
         if (argc > c && strcmp (argv[c], "MAX") == 0) {
-                use_average = FALSE;
+                use_average = false;
                 c++;
         }
         else if (argc > c && strcmp (argv[c], "AVG") == 0) {
-                use_average = TRUE;
+                use_average = true;
                 c++;
         }
 
diff --git a/plugins/check_mysql.c b/plugins/check_mysql.c
index 7d855544..15ec04c0 100644
--- a/plugins/check_mysql.c
+++ b/plugins/check_mysql.c
@@ -59,8 +59,8 @@ bool ssl = false;
 char *opt_file = NULL;
 char *opt_group = NULL;
 unsigned int db_port = MYSQL_PORT;
-int check_slave = 0, warn_sec = 0, crit_sec = 0;
-int ignore_auth = 0;
+bool check_slave = false;
+bool ignore_auth = false;
 int verbose = 0;
 
 static double warning_time = 0;
@@ -113,7 +113,7 @@ main (int argc, char **argv)
         char slaveresult[SLAVERESULTSIZE] = { 0 };
         char* perf;
 
-        perf = strdup ("");
+        perf = strdup ("");
 
         setlocale (LC_ALL, "");
         bindtextdomain (PACKAGE, LOCALEDIR);
@@ -193,14 +193,14 @@ main (int argc, char **argv)
                         for(i = 0; i < LENGTH_METRIC_UNIT; i++) {
                                 if (strcmp(row[0], metric_unit[i]) == 0) {
                                         xasprintf(&perf, "%s%s ", perf, perfdata(metric_unit[i],
-                                                atol(row[1]), "", FALSE, 0, FALSE, 0, FALSE, 0, FALSE, 0));
+                                                atol(row[1]), "", false, 0, false, 0, false, 0, false, 0));
                                         continue;
                                 }
                         }
                         for(i = 0; i < LENGTH_METRIC_COUNTER; i++) {
                                 if (strcmp(row[0], metric_counter[i]) == 0) {
                                         xasprintf(&perf, "%s%s ", perf, perfdata(metric_counter[i],
-                                                atol(row[1]), "c", FALSE, 0, FALSE, 0, FALSE, 0, FALSE, 0));
+                                                atol(row[1]), "c", false, 0, false, 0, false, 0, false, 0));
                                         continue;
                                 }
                         }
@@ -322,10 +322,10 @@ main (int argc, char **argv)
                                 status = get_status(value, my_threshold);
 
                                 xasprintf (&perf, "%s %s", perf, fperfdata ("seconds behind master", value, "s",
-                                        TRUE, (double) warning_time,
-                                        TRUE, (double) critical_time,
-                                        FALSE, 0,
-                                        FALSE, 0));
+                                                        true, (double) warning_time,
+                                                        true, (double) critical_time,
+                                                        false, 0,
+                                                        false, 0));
 
                                 if (status == STATE_WARNING) {
                                         printf("SLOW_SLAVE %s: %s|%s\n", _("WARNING"), slaveresult, perf);
@@ -456,10 +456,10 @@ process_arguments (int argc, char **argv)
                         db_port = atoi (optarg);
                         break;
                 case 'S':
-                        check_slave = 1;                                                        /* check-slave */
+                        check_slave = true;                                                     /* check-slave */
                         break;
                 case 'n':
-                        ignore_auth = 1;                                                        /* ignore-auth */
+                        ignore_auth = true;                                                     /* ignore-auth */
                         break;
                 case 'w':
                         warning = optarg;
diff --git a/plugins/check_mysql_query.c b/plugins/check_mysql_query.c
index ac2fb15d..842b7a2f 100644
--- a/plugins/check_mysql_query.c
+++ b/plugins/check_mysql_query.c
@@ -162,10 +162,10 @@ main (int argc, char **argv)
         }
         printf(_("'%s' returned %f | %s"), sql_query, value,
                 fperfdata("result", value, "",
-                my_thresholds->warning?TRUE:FALSE, my_thresholds->warning?my_thresholds->warning->end:0,
-                my_thresholds->critical?TRUE:FALSE, my_thresholds->critical?my_thresholds->critical->end:0,
-                FALSE, 0, 
-                FALSE, 0)
+                my_thresholds->warning?true:false, my_thresholds->warning?my_thresholds->warning->end:0,
+                my_thresholds->critical?true:false, my_thresholds->critical?my_thresholds->critical->end:0,
+                false, 0,
+                false, 0)
         );
         printf("\n");
 
diff --git a/plugins/check_nt.c b/plugins/check_nt.c
index d73d83ce..19c050de 100644
--- a/plugins/check_nt.c
+++ b/plugins/check_nt.c
@@ -67,17 +67,17 @@ char *req_password=NULL;
 unsigned long lvalue_list[MAX_VALUE_LIST];
 unsigned long warning_value=0L;
 unsigned long critical_value=0L;
-int check_warning_value=FALSE;
-int check_critical_value=FALSE;
+bool check_warning_value=false;
+bool check_critical_value=false;
 enum checkvars vars_to_check = CHECK_NONE;
-int show_all=FALSE;
+bool show_all = false;
 
 char recv_buffer[MAX_INPUT_BUFFER];
 
 void fetch_data (const char* address, int port, const char* sendb);
 int process_arguments(int, char **);
 void preparelist(char *string);
-int strtoularray(unsigned long *array, char *string, const char *delim);
+bool strtoularray(unsigned long *array, char *string, const char *delim);
 void print_help(void);
 void print_usage(void);
 
@@ -113,8 +113,8 @@ int main(int argc, char **argv){
         int uphours=0;
         int upminutes=0;
 
-        int isPercent = FALSE;
-        int allRight = FALSE;
+        bool isPercent = false;
+        bool allRight = false;
 
         setlocale (LC_ALL, "");
         bindtextdomain (PACKAGE, LOCALEDIR);
@@ -151,7 +151,7 @@ int main(int argc, char **argv){
 
                 if (value_list==NULL)
                         output_message = strdup (_("missing -l parameters"));
-                else if (strtoularray(lvalue_list,value_list,",")==FALSE)
+                else if (! strtoularray(lvalue_list,value_list,","))
                         output_message = strdup (_("wrong -l parameter."));
                 else {
                         /* -l parameters is present with only integers */
@@ -224,9 +224,9 @@ int main(int argc, char **argv){
 
                         xasprintf(&output_message,_("System Uptime - %u day(s) %u hour(s) %u minute(s) |uptime=%lu"),updays, uphours, upminutes, uptime);
 
-                        if (check_critical_value==TRUE && uptime <= critical_value)
+                        if (check_critical_value && uptime <= critical_value)
                                 return_code=STATE_CRITICAL;
-                        else if (check_warning_value==TRUE && uptime <= warning_value)
+                        else if (check_warning_value && uptime <= warning_value)
                                 return_code=STATE_WARNING;
                         else
                                 return_code=STATE_OK;
@@ -261,9 +261,9 @@ int main(int argc, char **argv){
                                   (total_disk_space - free_disk_space) / 1073741824, warning_used_space / 1073741824,
                                   critical_used_space / 1073741824, total_disk_space / 1073741824);
 
-                                if(check_critical_value==TRUE && percent_used_space >= critical_value)
+                                if(check_critical_value && percent_used_space >= critical_value)
                                         return_code=STATE_CRITICAL;
-                                else if (check_warning_value==TRUE && percent_used_space >= warning_value)
+                                else if (check_warning_value && percent_used_space >= warning_value)
                                         return_code=STATE_WARNING;
                                 else
                                         return_code=STATE_OK;
@@ -285,7 +285,7 @@ int main(int argc, char **argv){
                 else {
                         preparelist(value_list);                /* replace , between services with & to send the request */
                         xasprintf(&send_buffer,"%s&%u&%s&%s", req_password,(vars_to_check==CHECK_SERVICESTATE)?5:6,
-                                                         (show_all==TRUE) ? "ShowAll" : "ShowFail",value_list);
+                                                         (show_all) ? "ShowAll" : "ShowFail",value_list);
                         fetch_data (server_address, server_port, send_buffer);
                         numstr = strtok(recv_buffer,"&");
                         if (numstr == NULL)
@@ -321,9 +321,9 @@ int main(int argc, char **argv){
                   warning_used_space / 1048567, critical_used_space / 1048567, mem_commitLimit / 1048567);
 
                 return_code=STATE_OK;
-                if(check_critical_value==TRUE && percent_used_space >= critical_value)
+                if(check_critical_value && percent_used_space >= critical_value)
                         return_code=STATE_CRITICAL;
-                else if (check_warning_value==TRUE && percent_used_space >= warning_value)
+                else if (check_warning_value && percent_used_space >= warning_value)
                         return_code=STATE_WARNING;
 
                 break;
@@ -371,7 +371,7 @@ int main(int argc, char **argv){
                         else if (isPercent)
                         {
                                 counter_unit = strdup ("%");
-                                allRight = TRUE;
+                                allRight = true;
                         }
 
                         if ((counter_unit != NULL) && (!allRight))
@@ -391,7 +391,7 @@ int main(int argc, char **argv){
                                         if ((fmaxval == 0) && (maxval == errcvt))
                                                 output_message = strdup (_("Maximum value contains non-numbers"));
                                         else
-                                                allRight = TRUE;        /* Everything is OK. */
+                                                allRight = true;        /* Everything is OK. */
 
                                 }
                         }
@@ -418,9 +418,9 @@ int main(int argc, char **argv){
 
                 if (critical_value > warning_value)
                 {                       /* Normal thresholds */
-                        if (check_critical_value == TRUE && counter_value >= critical_value)
+                        if (check_critical_value && counter_value >= critical_value)
                                 return_code = STATE_CRITICAL;
-                        else if (check_warning_value == TRUE && counter_value >= warning_value)
+                        else if (check_warning_value  && counter_value >= warning_value)
                                 return_code = STATE_WARNING;
                         else
                                 return_code = STATE_OK;
@@ -428,9 +428,9 @@ int main(int argc, char **argv){
                 else
                 {                       /* inverse thresholds */
                         return_code = STATE_OK;
-                        if (check_critical_value == TRUE && counter_value <= critical_value)
+                        if (check_critical_value && counter_value <= critical_value)
                                 return_code = STATE_CRITICAL;
-                        else if (check_warning_value == TRUE && counter_value <= warning_value)
+                        else if (check_warning_value && counter_value <= warning_value)
                                 return_code = STATE_WARNING;
                 }
         break;
@@ -448,17 +448,17 @@ int main(int argc, char **argv){
                         output_message = strdup (description);
 
                         if (critical_value > warning_value) {        /* Normal thresholds */
-                                if(check_critical_value==TRUE && age_in_minutes >= critical_value)
+                                if(check_critical_value && age_in_minutes >= critical_value)
                                         return_code=STATE_CRITICAL;
-                                else if (check_warning_value==TRUE && age_in_minutes >= warning_value)
+                                else if (check_warning_value && age_in_minutes >= warning_value)
                                         return_code=STATE_WARNING;
                                 else
                                         return_code=STATE_OK;
                         }
                         else {                                       /* inverse thresholds */
-                                if(check_critical_value==TRUE && age_in_minutes <= critical_value)
+                                if(check_critical_value && age_in_minutes <= critical_value)
                                         return_code=STATE_CRITICAL;
-                                else if (check_warning_value==TRUE && age_in_minutes <= warning_value)
+                                else if (check_warning_value && age_in_minutes <= warning_value)
                                         return_code=STATE_WARNING;
                                 else
                                         return_code=STATE_OK;
@@ -600,15 +600,15 @@ int process_arguments(int argc, char **argv){
                                 break;
                         case 'w': /* warning threshold */
                                 warning_value=strtoul(optarg,NULL,10);
-                                check_warning_value=TRUE;
+                                check_warning_value=true;
                                 break;
                         case 'c': /* critical threshold */
                                 critical_value=strtoul(optarg,NULL,10);
-                                check_critical_value=TRUE;
+                                check_critical_value=true;
                                 break;
                         case 'd': /* Display select for services */
                                 if (!strcmp(optarg,"SHOWALL"))
-                                        show_all = TRUE;
+                                        show_all = true;
                                 break;
                         case 'u':
                                 socket_timeout_state=STATE_UNKNOWN;
@@ -646,7 +646,7 @@ void fetch_data (const char *address, int port, const char *sendb) {
                 die (STATE_UNKNOWN, "NSClient - %s\n",recv_buffer);
 }
 
-int strtoularray(unsigned long *array, char *string, const char *delim) {
+bool strtoularray(unsigned long *array, char *string, const char *delim) {
         /* split a <delim> delimited string into a long array */
         int idx=0;
         char *t1;
@@ -660,9 +660,9 @@ int strtoularray(unsigned long *array, char *string, const char *delim) {
                         array[idx]=strtoul(t1,NULL,10);
                         idx++;
                 } else
-                        return FALSE;
+                        return false;
         }
-        return TRUE;
+        return true;
 }
 
 void preparelist(char *string) {
diff --git a/plugins/check_ntp.c b/plugins/check_ntp.c
index 36146505..61b2d699 100644
--- a/plugins/check_ntp.c
+++ b/plugins/check_ntp.c
@@ -40,10 +40,10 @@ const char *email = "devel@monitoring-plugins.org";
 
 static char *server_address=NULL;
 static int verbose=0;
-static short do_offset=0;
+static bool do_offset = false;
 static char *owarn="60";
 static char *ocrit="120";
-static short do_jitter=0;
+static bool do_jitter = false;
 static char *jwarn="5000";
 static char *jcrit="10000";
 
@@ -486,7 +486,7 @@ double offset_request(const char *host, int *status){
         }
 
         /* cleanup */
-        /* FIXME: Not closing the socket to avoid re-use of the local port
+        /* FIXME: Not closing the socket to avoid reuse of the local port
          * which can cause old NTP packets to be read instead of NTP control
          * packets in jitter_request(). THERE MUST BE ANOTHER WAY...
          * for(j=0; j<num_hosts; j++){ close(socklist[j]); } */
@@ -513,7 +513,8 @@ setup_control_request(ntp_control_message *p, uint8_t opcode, uint16_t seq){
 
 /* XXX handle responses with the error bit set */
 double jitter_request(int *status){
-        int conn=-1, i, npeers=0, num_candidates=0, syncsource_found=0;
+        int conn=-1, i, npeers=0, num_candidates=0;
+        bool syncsource_found = false;
         int run=0, min_peer_sel=PEER_INCLUDED, num_selected=0, num_valid=0;
         int peers_size=0, peer_offset=0;
         ntp_assoc_status_pair *peers=NULL;
@@ -570,7 +571,7 @@ double jitter_request(int *status){
                 if (PEER_SEL(peers[i].status) >= PEER_INCLUDED){
                         num_candidates++;
                         if(PEER_SEL(peers[i].status) >= PEER_SYNCSOURCE){
-                                syncsource_found=1;
+                                syncsource_found = true;
                                 min_peer_sel=PEER_SYNCSOURCE;
                         }
                 }
@@ -699,23 +700,23 @@ int process_arguments(int argc, char **argv){
                         verbose++;
                         break;
                 case 'w':
-                        do_offset=1;
+                        do_offset = true;
                         owarn = optarg;
                         break;
                 case 'c':
-                        do_offset=1;
+                        do_offset = true;
                         ocrit = optarg;
                         break;
                 case 'j':
-                        do_jitter=1;
+                        do_jitter = true;
                         jwarn = optarg;
                         break;
                 case 'k':
-                        do_jitter=1;
+                        do_jitter = true;
                         jcrit = optarg;
                         break;
                 case 'H':
-                        if(is_host(optarg) == FALSE)
+                        if(!is_host(optarg))
                                 usage2(_("Invalid hostname/address"), optarg);
                         server_address = strdup(optarg);
                         break;
@@ -749,9 +750,9 @@ int process_arguments(int argc, char **argv){
 char *perfd_offset (double offset)
 {
         return fperfdata ("offset", offset, "s",
-                TRUE, offset_thresholds->warning->end,
-                TRUE, offset_thresholds->critical->end,
-                FALSE, 0, FALSE, 0);
+                true, offset_thresholds->warning->end,
+                true, offset_thresholds->critical->end,
+                false, 0, false, 0);
 }
 
 char *perfd_jitter (double jitter)
@@ -759,7 +760,7 @@ char *perfd_jitter (double jitter)
         return fperfdata ("jitter", jitter, "s",
                 do_jitter, jitter_thresholds->warning->end,
                 do_jitter, jitter_thresholds->critical->end,
-                TRUE, 0, FALSE, 0);
+                true, 0, false, 0);
 }
 
 int main(int argc, char *argv[]){
diff --git a/plugins/check_ntp_peer.c b/plugins/check_ntp_peer.c
index 49cb1008..464a9e10 100644
--- a/plugins/check_ntp_peer.c
+++ b/plugins/check_ntp_peer.c
@@ -46,21 +46,20 @@ const char *email = "devel@monitoring-plugins.org";
 static char *server_address=NULL;
 static int port=123;
 static int verbose=0;
-static int quiet=0;
-static short do_offset=0;
+static bool quiet = false;
 static char *owarn="60";
 static char *ocrit="120";
-static short do_stratum=0;
+static bool do_stratum = false;
 static char *swarn="-1:16";
 static char *scrit="-1:16";
-static short do_jitter=0;
+static bool do_jitter = false;
 static char *jwarn="-1:5000";
 static char *jcrit="-1:10000";
-static short do_truechimers=0;
+static bool do_truechimers = false;
 static char *twarn="0:";
 static char *tcrit="0:";
-static int syncsource_found=0;
-static int li_alarm=0;
+static bool syncsource_found = false;
+static bool li_alarm = false;
 
 int process_arguments (int, char **);
 thresholds *offset_thresholds = NULL;
@@ -254,7 +253,7 @@ int ntp_request(double *offset, int *offset_result, double *jitter, int *stratum
                                 die(STATE_CRITICAL, "NTP CRITICAL: Invalid packet received from NTP server\n");
                 } while (!(req.op&OP_READSTAT && ntohs(req.seq) == 1));
 
-                if (LI(req.flags) == LI_ALARM) li_alarm = 1;
+                if (LI(req.flags) == LI_ALARM) li_alarm = true;
                 /* Each peer identifier is 4 bytes in the data section, which
                  * we represent as a ntp_assoc_status_pair datatype.
                  */
@@ -276,7 +275,7 @@ int ntp_request(double *offset, int *offset_result, double *jitter, int *stratum
                         if(PEER_SEL(peers[i].status) >= PEER_INCLUDED){
                                 num_candidates++;
                                 if(PEER_SEL(peers[i].status) >= PEER_SYNCSOURCE){
-                                        syncsource_found=1;
+                                        syncsource_found = true;
                                         min_peer_sel=PEER_SYNCSOURCE;
                                 }
                         }
@@ -440,7 +439,7 @@ int process_arguments(int argc, char **argv){
         if (argc < 2)
                 usage ("\n");
 
-        while (1) {
+        while (true) {
                 c = getopt_long (argc, argv, "Vhv46qw:c:W:C:j:k:m:n:t:H:p:", longopts, &option);
                 if (c == -1 || c == EOF || c == 1)
                         break;
@@ -458,42 +457,40 @@ int process_arguments(int argc, char **argv){
                         verbose++;
                         break;
                 case 'q':
-                        quiet = 1;
+                        quiet = true;
                         break;
                 case 'w':
-                        do_offset=1;
                         owarn = optarg;
                         break;
                 case 'c':
-                        do_offset=1;
                         ocrit = optarg;
                         break;
                 case 'W':
-                        do_stratum=1;
+                        do_stratum = true;
                         swarn = optarg;
                         break;
                 case 'C':
-                        do_stratum=1;
+                        do_stratum = true;
                         scrit = optarg;
                         break;
                 case 'j':
-                        do_jitter=1;
+                        do_jitter = true;
                         jwarn = optarg;
                         break;
                 case 'k':
-                        do_jitter=1;
+                        do_jitter = true;
                         jcrit = optarg;
                         break;
                 case 'm':
-                        do_truechimers=1;
+                        do_truechimers = true;
                         twarn = optarg;
                         break;
                 case 'n':
-                        do_truechimers=1;
+                        do_truechimers = true;
                         tcrit = optarg;
                         break;
                 case 'H':
-                        if(is_host(optarg) == FALSE)
+                        if(!is_host(optarg))
                                 usage2(_("Invalid hostname/address"), optarg);
                         server_address = strdup(optarg);
                         break;
@@ -530,9 +527,9 @@ int process_arguments(int argc, char **argv){
 char *perfd_offset (double offset)
 {
         return fperfdata ("offset", offset, "s",
-                TRUE, offset_thresholds->warning->end,
-                TRUE, offset_thresholds->critical->end,
-                FALSE, 0, FALSE, 0);
+                true, offset_thresholds->warning->end,
+                true, offset_thresholds->critical->end,
+                false, 0, false, 0);
 }
 
 char *perfd_jitter (double jitter)
@@ -540,7 +537,7 @@ char *perfd_jitter (double jitter)
         return fperfdata ("jitter", jitter, "",
                 do_jitter, jitter_thresholds->warning->end,
                 do_jitter, jitter_thresholds->critical->end,
-                TRUE, 0, FALSE, 0);
+                true, 0, false, 0);
 }
 
 char *perfd_stratum (int stratum)
@@ -548,7 +545,7 @@ char *perfd_stratum (int stratum)
         return perfdata ("stratum", stratum, "",
                 do_stratum, (int)stratum_thresholds->warning->end,
                 do_stratum, (int)stratum_thresholds->critical->end,
-                TRUE, 0, TRUE, 16);
+                true, 0, true, 16);
 }
 
 char *perfd_truechimers (int num_truechimers)
@@ -556,11 +553,11 @@ char *perfd_truechimers (int num_truechimers)
         return perfdata ("truechimers", num_truechimers, "",
                 do_truechimers, (int)truechimer_thresholds->warning->end,
                 do_truechimers, (int)truechimer_thresholds->critical->end,
-                TRUE, 0, FALSE, 0);
+                true, 0, false, 0);
 }
 
 int main(int argc, char *argv[]){
-        int result, offset_result, stratum, num_truechimers, oresult, jresult, sresult, tresult;
+        int result, offset_result, stratum, num_truechimers;
         double offset=0, jitter=0;
         char *result_line, *perfdata_line;
 
@@ -590,25 +587,35 @@ int main(int argc, char *argv[]){
 
         if(offset_result == STATE_UNKNOWN) {
                 /* if there's no sync peer (this overrides ntp_request output): */
-                result = (quiet == 1 ? STATE_UNKNOWN : STATE_CRITICAL);
+                result = (quiet ? STATE_UNKNOWN : STATE_CRITICAL);
         } else {
                 /* Be quiet if there's no candidates either */
-                if (quiet == 1 && result == STATE_WARNING)
+                if (quiet && result == STATE_WARNING)
                         result = STATE_UNKNOWN;
                 result = max_state_alt(result, get_status(fabs(offset), offset_thresholds));
         }
-        oresult = result;
+
+        int oresult = result;
+
+
+        int tresult = STATE_UNKNOWN;
         
         if(do_truechimers) {
                 tresult = get_status(num_truechimers, truechimer_thresholds);
                 result = max_state_alt(result, tresult);
         }
 
+
+        int sresult = STATE_UNKNOWN;
+
         if(do_stratum) {
                 sresult = get_status(stratum, stratum_thresholds);
                 result = max_state_alt(result, sresult);
         }
 
+
+        int jresult = STATE_UNKNOWN;
+
         if(do_jitter) {
                 jresult = get_status(jitter, jitter_thresholds);
                 result = max_state_alt(result, jresult);
diff --git a/plugins/check_ntp_time.c b/plugins/check_ntp_time.c
index 46cc604f..b2e16556 100644
--- a/plugins/check_ntp_time.c
+++ b/plugins/check_ntp_time.c
@@ -45,7 +45,7 @@ const char *email = "devel@monitoring-plugins.org";
 static char *server_address=NULL;
 static char *port="123";
 static int verbose=0;
-static int quiet=0;
+static bool quiet = false;
 static char *owarn="60";
 static char *ocrit="120";
 static int time_offset=0;
@@ -485,7 +485,7 @@ int process_arguments(int argc, char **argv){
                         verbose++;
                         break;
                 case 'q':
-                        quiet = 1;
+                        quiet = true;
                         break;
                 case 'w':
                         owarn = optarg;
@@ -494,7 +494,7 @@ int process_arguments(int argc, char **argv){
                         ocrit = optarg;
                         break;
                 case 'H':
-                        if(is_host(optarg) == FALSE)
+                        if(!is_host(optarg))
                                 usage2(_("Invalid hostname/address"), optarg);
                         server_address = strdup(optarg);
                         break;
@@ -531,12 +531,11 @@ int process_arguments(int argc, char **argv){
         return 0;
 }
 
-char *perfd_offset (double offset)
-{
+char *perfd_offset (double offset) {
         return fperfdata ("offset", offset, "s",
-                TRUE, offset_thresholds->warning->end,
-                TRUE, offset_thresholds->critical->end,
-                FALSE, 0, FALSE, 0);
+                true, offset_thresholds->warning->end,
+                true, offset_thresholds->critical->end,
+                false, 0, false, 0);
 }
 
 int main(int argc, char *argv[]){
@@ -566,7 +565,7 @@ int main(int argc, char *argv[]){
 
         offset = offset_request(server_address, &offset_result);
         if (offset_result == STATE_UNKNOWN) {
-                result = (quiet == 1 ? STATE_UNKNOWN : STATE_CRITICAL);
+                result = ( (!quiet) ? STATE_UNKNOWN : STATE_CRITICAL);
         } else {
                 result = get_status(fabs(offset), offset_thresholds);
         }
diff --git a/plugins/check_nwstat.c b/plugins/check_nwstat.c
index 3c9d23e2..10c493b6 100644
--- a/plugins/check_nwstat.c
+++ b/plugins/check_nwstat.c
@@ -46,6 +46,7 @@ enum checkvar {
         VPF,        /* check % free space on volume */
         VMF,        /* check MB free space on volume */
         VMU,        /* check MB used space on volume */
+        VPU,        /* check % used space on volume */
         VMP,        /* check MB purgeable space on volume */
         VKF,        /* check KB free space on volume */
         LTCH,       /* check long-term cache hit percentage */
@@ -104,9 +105,9 @@ char *nss7_name=NULL;
 int server_port=PORT;
 unsigned long warning_value=0L;
 unsigned long critical_value=0L;
-int check_warning_value=FALSE;
-int check_critical_value=FALSE;
-int check_netware_version=FALSE;
+bool check_warning_value = false;
+bool check_critical_value = false;
+bool check_netware_version = false;
 enum checkvar vars_to_check = NONE;
 int sap_number=-1;
 
@@ -146,6 +147,8 @@ main(int argc, char **argv) {
         unsigned long nss6_value=0L;
         unsigned long nss7_value=0L;
         unsigned long total_disk_space=0L;
+        unsigned long used_disk_space=0L;
+        unsigned long percent_used_disk_space=0L;
         unsigned long purgeable_disk_space=0L;
         unsigned long non_purgeable_disk_space=0L;
         unsigned long percent_free_space=0;
@@ -182,7 +185,7 @@ main(int argc, char **argv) {
         my_tcp_connect (server_address, server_port, &sd);
 
         /* get OS version string */
-        if (check_netware_version==TRUE) {
+        if (check_netware_version) {
                 send_buffer = strdup ("S19\r\n");
                 result=send_tcp_request(sd,send_buffer,recv_buffer,sizeof(recv_buffer));
                 if (result!=STATE_OK)
@@ -231,9 +234,9 @@ main(int argc, char **argv) {
                 recv_buffer[strlen(recv_buffer)-1]=0;
                 sprintf(uptime,_("Up %s,"),recv_buffer);
 
-                if (check_critical_value==TRUE && utilization >= critical_value)
+                if (check_critical_value && utilization >= critical_value)
                         result=STATE_CRITICAL;
-                else if (check_warning_value==TRUE && utilization >= warning_value)
+                else if (check_warning_value && utilization >= warning_value)
                         result=STATE_WARNING;
 
                 xasprintf (&output_message,
@@ -259,9 +262,9 @@ main(int argc, char **argv) {
                         return result;
                 current_connections=strtoul(recv_buffer,NULL,10);
 
-                if (check_critical_value==TRUE && current_connections >= critical_value)
+                if (check_critical_value && current_connections >= critical_value)
                         result=STATE_CRITICAL;
-                else if (check_warning_value==TRUE && current_connections >= warning_value)
+                else if (check_warning_value && current_connections >= warning_value)
                         result=STATE_WARNING;
 
                 xasprintf (&output_message,
@@ -284,9 +287,9 @@ main(int argc, char **argv) {
                         return result;
                 cache_hits=atoi(recv_buffer);
 
-                if (check_critical_value==TRUE && cache_hits <= critical_value)
+                if (check_critical_value && cache_hits <= critical_value)
                         result=STATE_CRITICAL;
-                else if (check_warning_value==TRUE && cache_hits <= warning_value)
+                else if (check_warning_value && cache_hits <= warning_value)
                         result=STATE_WARNING;
 
                 xasprintf (&output_message,
@@ -306,9 +309,9 @@ main(int argc, char **argv) {
                         return result;
                 cache_buffers=strtoul(recv_buffer,NULL,10);
 
-                if (check_critical_value==TRUE && cache_buffers <= critical_value)
+                if (check_critical_value && cache_buffers <= critical_value)
                         result=STATE_CRITICAL;
-                else if (check_warning_value==TRUE && cache_buffers <= warning_value)
+                else if (check_warning_value && cache_buffers <= warning_value)
                         result=STATE_WARNING;
 
                 xasprintf (&output_message,
@@ -331,9 +334,9 @@ main(int argc, char **argv) {
                         return result;
                 cache_buffers=strtoul(recv_buffer,NULL,10);
 
-                if (check_critical_value==TRUE && cache_buffers >= critical_value)
+                if (check_critical_value && cache_buffers >= critical_value)
                         result=STATE_CRITICAL;
-                else if (check_warning_value==TRUE && cache_buffers >= warning_value)
+                else if (check_warning_value && cache_buffers >= warning_value)
                         result=STATE_WARNING;
 
                 xasprintf (&output_message,
@@ -356,9 +359,9 @@ main(int argc, char **argv) {
                         return result;
                 lru_time=strtoul(recv_buffer,NULL,10);
 
-                if (check_critical_value==TRUE && lru_time <= critical_value)
+                if (check_critical_value && lru_time <= critical_value)
                         result=STATE_CRITICAL;
-                else if (check_warning_value==TRUE && lru_time <= warning_value)
+                else if (check_warning_value && lru_time <= warning_value)
                         result=STATE_WARNING;
 
                 xasprintf (&output_message,
@@ -383,9 +386,9 @@ main(int argc, char **argv) {
                         result=STATE_CRITICAL;
                 }       else {
                         free_disk_space=strtoul(recv_buffer,NULL,10);
-                        if (check_critical_value==TRUE && free_disk_space <= critical_value)
+                        if (check_critical_value && free_disk_space <= critical_value)
                                 result=STATE_CRITICAL;
-                        else if (check_warning_value==TRUE && free_disk_space <= warning_value)
+                        else if (check_warning_value && free_disk_space <= warning_value)
                                 result=STATE_WARNING;
                         xasprintf (&output_message,
                                   _("%s%lu KB free on volume %s|KBFree%s=%lu;%lu;%lu;;"),
@@ -411,9 +414,9 @@ main(int argc, char **argv) {
                         result=STATE_CRITICAL;
                 }       else {
                         free_disk_space=strtoul(recv_buffer,NULL,10);
-                        if (check_critical_value==TRUE && free_disk_space <= critical_value)
+                        if (check_critical_value && free_disk_space <= critical_value)
                                 result=STATE_CRITICAL;
-                        else if (check_warning_value==TRUE && free_disk_space <= warning_value)
+                        else if (check_warning_value && free_disk_space <= warning_value)
                                 result=STATE_WARNING;
                         xasprintf (&output_message,
                                   _("%s%lu MB free on volume %s|MBFree%s=%lu;%lu;%lu;;"),
@@ -438,9 +441,9 @@ main(int argc, char **argv) {
                         result=STATE_CRITICAL;
                 }       else {
                         free_disk_space=strtoul(recv_buffer,NULL,10);
-                        if (check_critical_value==TRUE && free_disk_space <= critical_value)
+                        if (check_critical_value && free_disk_space <= critical_value)
                                 result=STATE_CRITICAL;
-                        else if (check_warning_value==TRUE && free_disk_space <= warning_value)
+                        else if (check_warning_value && free_disk_space <= warning_value)
                                 result=STATE_WARNING;
                         xasprintf (&output_message,
                                   _("%s%lu MB used on volume %s|MBUsed%s=%lu;%lu;%lu;;"),
@@ -452,7 +455,50 @@ main(int argc, char **argv) {
                                  warning_value,
                                  critical_value);
                 }
+                /* check % used space on volume */
+        } else if (vars_to_check==VPU) {
+                close(sd);
+                my_tcp_connect (server_address, server_port, &sd);
+
+                asprintf (&send_buffer,"VMU%s\r\n",volume_name);
+                result=send_tcp_request(sd,send_buffer,recv_buffer,sizeof(recv_buffer));
+
+                if (result!=STATE_OK)
+                        return result;
+
+                if (!strcmp(recv_buffer,"-1\n")) {
+                        asprintf (&output_message,_("CRITICAL - Volume '%s' does not exist!"),volume_name);
+                        result=STATE_CRITICAL;
+
+                } else {
+                        used_disk_space=strtoul(recv_buffer,NULL,10);
+                        close(sd);
+                        my_tcp_connect (server_address, server_port, &sd);
+                        /* get total volume in MB */
+                        asprintf (&send_buffer,"VMS%s\r\n",volume_name);
+                        result=send_tcp_request(sd,send_buffer,recv_buffer,sizeof(recv_buffer));
+                        if (result!=STATE_OK)
+                                return result;
+                        total_disk_space=strtoul(recv_buffer,NULL,10);
+                        /* calculate percent used on volume */
+                        percent_used_disk_space=(unsigned long)(((double)used_disk_space/(double)total_disk_space)*100.0);
 
+                        if (check_critical_value && percent_used_disk_space >= critical_value)
+                                result=STATE_CRITICAL;
+                        else if (check_warning_value && percent_used_disk_space >= warning_value)
+                                result=STATE_WARNING;
+
+                        asprintf (&output_message,_("%lu MB (%lu%%) used on volume %s - total %lu MB|Used space in percent on %s=%lu;%lu;%lu;0;100"),
+                                used_disk_space,
+                                percent_used_disk_space,
+                                volume_name,
+                                total_disk_space,
+                                volume_name,
+                                percent_used_disk_space,
+                                warning_value,
+                                critical_value
+                                );
+                }
 
                 /* check % free space on volume */
         } else if (vars_to_check==VPF) {
@@ -485,9 +531,9 @@ main(int argc, char **argv) {
 
                         percent_free_space=(unsigned long)(((double)free_disk_space/(double)total_disk_space)*100.0);
 
-                        if (check_critical_value==TRUE && percent_free_space <= critical_value)
+                        if (check_critical_value && percent_free_space <= critical_value)
                                 result=STATE_CRITICAL;
-                        else if (check_warning_value==TRUE && percent_free_space <= warning_value)
+                        else if (check_warning_value && percent_free_space <= warning_value)
                                 result=STATE_WARNING;
                         free_disk_space/=1024;
                         total_disk_space/=1024;
@@ -596,14 +642,14 @@ main(int argc, char **argv) {
                 percent_used_packet_receive_buffers=(unsigned long)(((double)used_packet_receive_buffers/(double)max_packet_receive_buffers)*100.0);
 
                 if (vars_to_check==UPRB) {
-                        if (check_critical_value==TRUE && used_packet_receive_buffers >= critical_value)
+                        if (check_critical_value && used_packet_receive_buffers >= critical_value)
                                 result=STATE_CRITICAL;
-                        else if (check_warning_value==TRUE && used_packet_receive_buffers >= warning_value)
+                        else if (check_warning_value && used_packet_receive_buffers >= warning_value)
                                 result=STATE_WARNING;
                 } else {
-                        if (check_critical_value==TRUE && percent_used_packet_receive_buffers >= critical_value)
+                        if (check_critical_value && percent_used_packet_receive_buffers >= critical_value)
                                 result=STATE_CRITICAL;
-                        else if (check_warning_value==TRUE && percent_used_packet_receive_buffers >= warning_value)
+                        else if (check_warning_value && percent_used_packet_receive_buffers >= warning_value)
                                 result=STATE_WARNING;
                 }
 
@@ -625,9 +671,9 @@ main(int argc, char **argv) {
 
                 sap_entries=atoi(recv_buffer);
 
-                if (check_critical_value==TRUE && sap_entries >= critical_value)
+                if (check_critical_value && sap_entries >= critical_value)
                         result=STATE_CRITICAL;
-                else if (check_warning_value==TRUE && sap_entries >= warning_value)
+                else if (check_warning_value && sap_entries >= warning_value)
                         result=STATE_WARNING;
 
                 if (sap_number==-1)
@@ -651,9 +697,9 @@ main(int argc, char **argv) {
                         result=STATE_CRITICAL;
                 } else {
                         purgeable_disk_space=strtoul(recv_buffer,NULL,10);
-                        if (check_critical_value==TRUE && purgeable_disk_space >= critical_value)
+                        if (check_critical_value && purgeable_disk_space >= critical_value)
                                 result=STATE_CRITICAL;
-                        else if (check_warning_value==TRUE && purgeable_disk_space >= warning_value)
+                        else if (check_warning_value && purgeable_disk_space >= warning_value)
                                 result=STATE_WARNING;
                         xasprintf (&output_message,_("%s%lu KB purgeable on volume %s|Purge%s=%lu;%lu;%lu;;"),
                                  (result==STATE_OK)?"":_("Only "),
@@ -677,9 +723,9 @@ main(int argc, char **argv) {
                         result=STATE_CRITICAL;
                 } else {
                         purgeable_disk_space=strtoul(recv_buffer,NULL,10);
-                        if (check_critical_value==TRUE && purgeable_disk_space >= critical_value)
+                        if (check_critical_value && purgeable_disk_space >= critical_value)
                                 result=STATE_CRITICAL;
-                        else if (check_warning_value==TRUE && purgeable_disk_space >= warning_value)
+                        else if (check_warning_value && purgeable_disk_space >= warning_value)
                                 result=STATE_WARNING;
                         xasprintf (&output_message,_("%s%lu MB purgeable on volume %s|Purge%s=%lu;%lu;%lu;;"),
                                  (result==STATE_OK)?"":_("Only "),
@@ -722,9 +768,9 @@ main(int argc, char **argv) {
 
                         percent_purgeable_space=(unsigned long)(((double)purgeable_disk_space/(double)total_disk_space)*100.0);
 
-                        if (check_critical_value==TRUE && percent_purgeable_space >= critical_value)
+                        if (check_critical_value && percent_purgeable_space >= critical_value)
                                 result=STATE_CRITICAL;
-                        else if (check_warning_value==TRUE && percent_purgeable_space >= warning_value)
+                        else if (check_warning_value && percent_purgeable_space >= warning_value)
                                 result=STATE_WARNING;
                         purgeable_disk_space/=1024;
                         xasprintf (&output_message,_("%lu MB (%lu%%) purgeable on volume %s|Purgeable%s=%lu;%lu;%lu;0;100"),
@@ -754,9 +800,9 @@ main(int argc, char **argv) {
                         result=STATE_CRITICAL;
                 } else {
                         non_purgeable_disk_space=strtoul(recv_buffer,NULL,10);
-                        if (check_critical_value==TRUE && non_purgeable_disk_space >= critical_value)
+                        if (check_critical_value && non_purgeable_disk_space >= critical_value)
                                 result=STATE_CRITICAL;
-                        else if (check_warning_value==TRUE && non_purgeable_disk_space >= warning_value)
+                        else if (check_warning_value && non_purgeable_disk_space >= warning_value)
                                 result=STATE_WARNING;
                         xasprintf (&output_message,_("%s%lu KB not yet purgeable on volume %s"),(result==STATE_OK)?"":_("Only "),non_purgeable_disk_space,volume_name);
                 }
@@ -792,9 +838,9 @@ main(int argc, char **argv) {
 
                         percent_non_purgeable_space=(unsigned long)(((double)non_purgeable_disk_space/(double)total_disk_space)*100.0);
 
-                        if (check_critical_value==TRUE && percent_non_purgeable_space >= critical_value)
+                        if (check_critical_value && percent_non_purgeable_space >= critical_value)
                                 result=STATE_CRITICAL;
-                        else if (check_warning_value==TRUE && percent_non_purgeable_space >= warning_value)
+                        else if (check_warning_value && percent_non_purgeable_space >= warning_value)
                                 result=STATE_WARNING;
                         purgeable_disk_space/=1024;
                         xasprintf (&output_message,_("%lu MB (%lu%%) not yet purgeable on volume %s"),non_purgeable_disk_space,percent_non_purgeable_space,volume_name);
@@ -813,9 +859,9 @@ main(int argc, char **argv) {
 
                 open_files=atoi(recv_buffer);
 
-                if (check_critical_value==TRUE && open_files >= critical_value)
+                if (check_critical_value && open_files >= critical_value)
                         result=STATE_CRITICAL;
-                else if (check_warning_value==TRUE && open_files >= warning_value)
+                else if (check_warning_value && open_files >= warning_value)
                         result=STATE_WARNING;
 
                 xasprintf (&output_message,_("%lu open files|Openfiles=%lu;%lu;%lu;0,0"),
@@ -838,9 +884,9 @@ main(int argc, char **argv) {
 
                 abended_threads=atoi(recv_buffer);
 
-                if (check_critical_value==TRUE && abended_threads >= critical_value)
+                if (check_critical_value && abended_threads >= critical_value)
                         result=STATE_CRITICAL;
-                else if (check_warning_value==TRUE && abended_threads >= warning_value)
+                else if (check_warning_value && abended_threads >= warning_value)
                         result=STATE_WARNING;
 
                 xasprintf (&output_message,_("%lu abended threads|Abends=%lu;%lu;%lu;;"),
@@ -872,9 +918,9 @@ main(int argc, char **argv) {
 
                 current_service_processes=atoi(recv_buffer);
 
-                if (check_critical_value==TRUE && current_service_processes >= critical_value)
+                if (check_critical_value && current_service_processes >= critical_value)
                         result=STATE_CRITICAL;
-                else if (check_warning_value==TRUE && current_service_processes >= warning_value)
+                else if (check_warning_value && current_service_processes >= warning_value)
                         result=STATE_WARNING;
 
                 xasprintf (&output_message,
@@ -923,9 +969,9 @@ main(int argc, char **argv) {
                         return result;
                 lru_time=strtoul(recv_buffer,NULL,10);
 
-                if (check_critical_value==TRUE && lru_time <= critical_value)
+                if (check_critical_value && lru_time <= critical_value)
                         result=STATE_CRITICAL;
-                else if (check_warning_value==TRUE && lru_time <= warning_value)
+                else if (check_warning_value && lru_time <= warning_value)
                         result=STATE_WARNING;
                 xasprintf (&output_message,_("LRU sitting time = %lu seconds"),lru_time);
 
@@ -942,9 +988,9 @@ main(int argc, char **argv) {
                         return result;
                 dirty_cache_buffers=atoi(recv_buffer);
 
-                if (check_critical_value==TRUE && dirty_cache_buffers <= critical_value)
+                if (check_critical_value && dirty_cache_buffers <= critical_value)
                         result=STATE_CRITICAL;
-                else if (check_warning_value==TRUE && dirty_cache_buffers <= warning_value)
+                else if (check_warning_value && dirty_cache_buffers <= warning_value)
                         result=STATE_WARNING;
                 xasprintf (&output_message,_("Dirty cache buffers = %lu%% of the total|DCB=%lu;%lu;%lu;0;100"),
                                 dirty_cache_buffers,
@@ -964,9 +1010,9 @@ main(int argc, char **argv) {
                         return result;
                 total_cache_buffers=atoi(recv_buffer);
 
-                if (check_critical_value==TRUE && total_cache_buffers <= critical_value)
+                if (check_critical_value && total_cache_buffers <= critical_value)
                         result=STATE_CRITICAL;
-                else if (check_warning_value==TRUE && total_cache_buffers <= warning_value)
+                else if (check_warning_value && total_cache_buffers <= warning_value)
                         result=STATE_WARNING;
                 xasprintf (&output_message,_("Total cache buffers = %lu%% of the original|TCB=%lu;%lu;%lu;0;100"),
                                 total_cache_buffers,
@@ -1034,9 +1080,9 @@ main(int argc, char **argv) {
                         result=STATE_CRITICAL;
                 }       else {
                         nrmp_value=strtoul(recv_buffer,NULL,10);
-                        if (check_critical_value==TRUE && nrmp_value <= critical_value)
+                        if (check_critical_value && nrmp_value <= critical_value)
                                 result=STATE_CRITICAL;
-                        else if (check_warning_value==TRUE && nrmp_value <= warning_value)
+                        else if (check_warning_value && nrmp_value <= warning_value)
                                 result=STATE_WARNING;
                         xasprintf (&output_message,
                                   _("%s is  %lu|%s=%lu;%lu;%lu;;"),
@@ -1060,9 +1106,9 @@ main(int argc, char **argv) {
                         result=STATE_CRITICAL;
                 }       else {
                         nrmm_value=strtoul(recv_buffer,NULL,10);
-                        if (check_critical_value==TRUE && nrmm_value <= critical_value)
+                        if (check_critical_value && nrmm_value <= critical_value)
                                 result=STATE_CRITICAL;
-                        else if (check_warning_value==TRUE && nrmm_value <= warning_value)
+                        else if (check_warning_value && nrmm_value <= warning_value)
                                 result=STATE_WARNING;
                         xasprintf (&output_message,
                                   _("%s is  %lu|%s=%lu;%lu;%lu;;"),
@@ -1086,9 +1132,9 @@ main(int argc, char **argv) {
                         result=STATE_CRITICAL;
                 }       else {
                         nrms_value=strtoul(recv_buffer,NULL,10);
-                        if (check_critical_value==TRUE && nrms_value >= critical_value)
+                        if (check_critical_value && nrms_value >= critical_value)
                                 result=STATE_CRITICAL;
-                        else if (check_warning_value==TRUE && nrms_value >= warning_value)
+                        else if (check_warning_value && nrms_value >= warning_value)
                                 result=STATE_WARNING;
                         xasprintf (&output_message,
                                   _("%s is  %lu|%s=%lu;%lu;%lu;;"),
@@ -1112,9 +1158,9 @@ main(int argc, char **argv) {
                         result=STATE_CRITICAL;
                 }       else {
                         nss1_value=strtoul(recv_buffer,NULL,10);
-                        if (check_critical_value==TRUE && nss1_value >= critical_value)
+                        if (check_critical_value && nss1_value >= critical_value)
                                 result=STATE_CRITICAL;
-                        else if (check_warning_value==TRUE && nss1_value >= warning_value)
+                        else if (check_warning_value && nss1_value >= warning_value)
                                 result=STATE_WARNING;
                         xasprintf (&output_message,
                                   _("%s is  %lu|%s=%lu;%lu;%lu;;"),
@@ -1138,9 +1184,9 @@ main(int argc, char **argv) {
                         result=STATE_CRITICAL;
                 }       else {
                         nss2_value=strtoul(recv_buffer,NULL,10);
-                        if (check_critical_value==TRUE && nss2_value >= critical_value)
+                        if (check_critical_value && nss2_value >= critical_value)
                                 result=STATE_CRITICAL;
-                        else if (check_warning_value==TRUE && nss2_value >= warning_value)
+                        else if (check_warning_value && nss2_value >= warning_value)
                                 result=STATE_WARNING;
                         xasprintf (&output_message,
                                   _("%s is  %lu|%s=%lu;%lu;%lu;;"),
@@ -1164,9 +1210,9 @@ main(int argc, char **argv) {
                         result=STATE_CRITICAL;
                 }       else {
                         nss3_value=strtoul(recv_buffer,NULL,10);
-                        if (check_critical_value==TRUE && nss3_value >= critical_value)
+                        if (check_critical_value && nss3_value >= critical_value)
                                 result=STATE_CRITICAL;
-                        else if (check_warning_value==TRUE && nss3_value >= warning_value)
+                        else if (check_warning_value && nss3_value >= warning_value)
                                 result=STATE_WARNING;
                         xasprintf (&output_message,
                                   _("%s is  %lu|%s=%lu;%lu;%lu;;"),
@@ -1190,9 +1236,9 @@ main(int argc, char **argv) {
                         result=STATE_CRITICAL;
                 }       else {
                         nss4_value=strtoul(recv_buffer,NULL,10);
-                        if (check_critical_value==TRUE && nss4_value >= critical_value)
+                        if (check_critical_value && nss4_value >= critical_value)
                                 result=STATE_CRITICAL;
-                        else if (check_warning_value==TRUE && nss4_value >= warning_value)
+                        else if (check_warning_value && nss4_value >= warning_value)
                                 result=STATE_WARNING;
                         xasprintf (&output_message,
                                   _("%s is  %lu|%s=%lu;%lu;%lu;;"),
@@ -1216,9 +1262,9 @@ main(int argc, char **argv) {
                         result=STATE_CRITICAL;
                 }       else {
                         nss5_value=strtoul(recv_buffer,NULL,10);
-                        if (check_critical_value==TRUE && nss5_value >= critical_value)
+                        if (check_critical_value && nss5_value >= critical_value)
                                 result=STATE_CRITICAL;
-                        else if (check_warning_value==TRUE && nss5_value >= warning_value)
+                        else if (check_warning_value && nss5_value >= warning_value)
                                 result=STATE_WARNING;
                         xasprintf (&output_message,
                                   _("%s is  %lu|%s=%lu;%lu;%lu;;"),
@@ -1242,9 +1288,9 @@ main(int argc, char **argv) {
                         result=STATE_CRITICAL;
                 }       else {
                         nss6_value=strtoul(recv_buffer,NULL,10);
-                        if (check_critical_value==TRUE && nss6_value >= critical_value)
+                        if (check_critical_value && nss6_value >= critical_value)
                                 result=STATE_CRITICAL;
-                        else if (check_warning_value==TRUE && nss6_value >= warning_value)
+                        else if (check_warning_value && nss6_value >= warning_value)
                                 result=STATE_WARNING;
                         xasprintf (&output_message,
                                   _("%s is  %lu|%s=%lu;%lu;%lu;;"),
@@ -1268,9 +1314,9 @@ main(int argc, char **argv) {
                         result=STATE_CRITICAL;
                 }       else {
                         nss7_value=strtoul(recv_buffer,NULL,10);
-                        if (check_critical_value==TRUE && nss7_value >= critical_value)
+                        if (check_critical_value && nss7_value >= critical_value)
                                 result=STATE_CRITICAL;
-                        else if (check_warning_value==TRUE && nss7_value >= warning_value)
+                        else if (check_warning_value && nss7_value >= warning_value)
                                 result=STATE_WARNING;
                         xasprintf (&output_message,
                                   _("%s is  %lu|%s=%lu;%lu;%lu;;"),
@@ -1362,7 +1408,7 @@ int process_arguments(int argc, char **argv) {
                                 server_address=optarg;
                                 break;
                         case 'o': /* display nos version */
-                                check_netware_version=TRUE;
+                                check_netware_version = true;
                                 break;
                         case 'p': /* port */
                                 if (is_intnonneg(optarg))
@@ -1450,6 +1496,12 @@ int process_arguments(int argc, char **argv) {
                                         if (!strcmp(volume_name,""))
                                                 volume_name = strdup ("SYS");
                                 }
+                                else if (strncmp(optarg,"VPU",3)==0) {
+                                        vars_to_check=VPU;
+                                        volume_name = strdup (optarg+3);
+                                        if (!strcmp(volume_name,""))
+                                                volume_name = strdup ("SYS");
+                                }
                                 else if (strncmp(optarg,"VPP",3)==0) {
                                         vars_to_check=VPP;
                                         volume_name = strdup (optarg+3);
@@ -1569,11 +1621,11 @@ int process_arguments(int argc, char **argv) {
                                 break;
                         case 'w': /* warning threshold */
                                 warning_value=strtoul(optarg,NULL,10);
-                                check_warning_value=TRUE;
+                                check_warning_value = true;
                                 break;
                         case 'c': /* critical threshold */
                                 critical_value=strtoul(optarg,NULL,10);
-                                check_critical_value=TRUE;
+                                check_critical_value = true;
                                 break;
                         case 't': /* timeout */
                                 socket_timeout=atoi(optarg);
@@ -1626,6 +1678,7 @@ void print_help(void)
         printf ("    %s\n", _("OFILES    = number of open files"));
   printf ("    %s\n", _("    VMF<vol>  = MB of free space on Volume <vol>"));
   printf ("    %s\n", _("    VMU<vol>  = MB used space on Volume <vol>"));
+  printf ("    %s\n", _("    VPU<vol>  = percent used space on Volume <vol>"));
   printf ("    %s\n", _("    VMP<vol>  = MB of purgeable space on Volume <vol>"));
   printf ("    %s\n", _("    VPF<vol>  = percent free space on volume <vol>"));
   printf ("    %s\n", _("    VKF<vol>  = KB of free space on volume <vol>"));
diff --git a/plugins/check_overcr.c b/plugins/check_overcr.c
index 9a4d25fa..5165c828 100644
--- a/plugins/check_overcr.c
+++ b/plugins/check_overcr.c
@@ -56,15 +56,15 @@ char *server_address = NULL;
 int server_port = PORT;
 double warning_value = 0L;
 double critical_value = 0L;
-int check_warning_value = FALSE;
-int check_critical_value = FALSE;
+bool check_warning_value = false;
+bool check_critical_value = false;
 enum checkvar vars_to_check = NONE;
 int cmd_timeout = 1;
 
 int netstat_port = 0;
 char *disk_name = NULL;
 char *process_name = NULL;
-        char send_buffer[MAX_INPUT_BUFFER];
+char send_buffer[MAX_INPUT_BUFFER];
 
 int process_arguments (int, char **);
 void print_usage (void);
@@ -77,7 +77,7 @@ main (int argc, char **argv)
         char recv_buffer[MAX_INPUT_BUFFER];
         char temp_buffer[MAX_INPUT_BUFFER];
         char *temp_ptr = NULL;
-        int found_disk = FALSE;
+        bool found_disk = false;
         unsigned long percent_used_disk_space = 100;
         double load;
         double load_1min;
@@ -155,9 +155,9 @@ main (int argc, char **argv)
                         break;
                 }
 
-                if (check_critical_value == TRUE && (load >= critical_value))
+                if (check_critical_value && (load >= critical_value))
                         result = STATE_CRITICAL;
-                else if (check_warning_value == TRUE && (load >= warning_value))
+                else if (check_warning_value && (load >= warning_value))
                         result = STATE_WARNING;
 
                 die (result,
@@ -178,7 +178,7 @@ main (int argc, char **argv)
                      temp_ptr = (char *) strtok (NULL, " ")) {
 
                         if (!strcmp (temp_ptr, disk_name)) {
-                                found_disk = TRUE;
+                                found_disk = true;
                                 temp_ptr = (char *) strtok (NULL, "%");
                                 if (temp_ptr == NULL)
                                         die (STATE_CRITICAL, _("Invalid response from server\n"));
@@ -191,14 +191,14 @@ main (int argc, char **argv)
                 }
 
                 /* error if we couldn't find the info for the disk */
-                if (found_disk == FALSE)
+                if (!found_disk)
                         die (STATE_CRITICAL,
                                    "CRITICAL - Disk '%s' non-existent or not mounted",
                                    disk_name);
 
-                if (check_critical_value == TRUE && (percent_used_disk_space >= critical_value))
+                if (check_critical_value && (percent_used_disk_space >= critical_value))
                         result = STATE_CRITICAL;
-                else if (check_warning_value == TRUE && (percent_used_disk_space >= warning_value))
+                else if (check_warning_value && (percent_used_disk_space >= warning_value))
                         result = STATE_WARNING;
 
                 die (result, "Disk %s - %lu%% used on %s", state_text(result), percent_used_disk_space, disk_name);
@@ -212,9 +212,9 @@ main (int argc, char **argv)
                 else
                         port_connections = strtod (recv_buffer, NULL);
 
-                if (check_critical_value == TRUE && (port_connections >= critical_value))
+                if (check_critical_value && (port_connections >= critical_value))
                         result = STATE_CRITICAL;
-                else if (check_warning_value == TRUE && (port_connections >= warning_value))
+                else if (check_warning_value && (port_connections >= warning_value))
                         result = STATE_WARNING;
 
                 die (result,
@@ -241,9 +241,9 @@ main (int argc, char **argv)
                 else
                         processes = strtod (temp_ptr, NULL);
 
-                if (check_critical_value == TRUE && (processes >= critical_value))
+                if (check_critical_value && (processes >= critical_value))
                         result = STATE_CRITICAL;
-                else if (check_warning_value == TRUE && (processes >= warning_value))
+                else if (check_warning_value && (processes >= warning_value))
                         result = STATE_WARNING;
 
                 die (result,
@@ -262,9 +262,9 @@ main (int argc, char **argv)
                 uptime_raw_hours = strtod (recv_buffer, NULL);
                 uptime_raw_minutes = (unsigned long) (uptime_raw_hours * 60.0);
 
-                if (check_critical_value == TRUE && (uptime_raw_minutes <= critical_value))
+                if (check_critical_value && (uptime_raw_minutes <= critical_value))
                         result = STATE_CRITICAL;
-                else if (check_warning_value == TRUE && (uptime_raw_minutes <= warning_value))
+                else if (check_warning_value && (uptime_raw_minutes <= warning_value))
                         result = STATE_WARNING;
 
                 uptime_days = uptime_raw_minutes / 1440;
@@ -388,11 +388,11 @@ process_arguments (int argc, char **argv)
                         break;
                 case 'w':                                                                       /* warning threshold */
                         warning_value = strtoul (optarg, NULL, 10);
-                        check_warning_value = TRUE;
+                        check_warning_value = true;
                         break;
                 case 'c':                                                                       /* critical threshold */
                         critical_value = strtoul (optarg, NULL, 10);
-                        check_critical_value = TRUE;
+                        check_critical_value = true;
                         break;
                 case 't':                                                                       /* timeout */
                         socket_timeout = atoi (optarg);
diff --git a/plugins/check_pgsql.c b/plugins/check_pgsql.c
index 61990335..94d589e1 100644
--- a/plugins/check_pgsql.c
+++ b/plugins/check_pgsql.c
@@ -69,7 +69,7 @@ int process_arguments (int, char **);
 int validate_arguments (void);
 void print_usage (void);
 void print_help (void);
-int is_pg_logname (char *);
+bool is_pg_logname (char *);
 int do_query (PGconn *, char *);
 
 char *pghost = NULL;                                            /* host name of the backend server */
@@ -252,7 +252,7 @@ main (int argc, char **argv)
         printf (_(" %s - database %s (%f sec.)|%s\n"),
                 state_text(status), dbName, elapsed_time,
                 fperfdata("time", elapsed_time, "s",
-                         !!(twarn > 0.0), twarn, !!(tcrit > 0.0), tcrit, TRUE, 0, FALSE,0));
+                         !!(twarn > 0.0), twarn, !!(tcrit > 0.0), tcrit, true, 0, false,0));
 
         if (pgquery)
                 query_status = do_query (conn, pgquery);
@@ -393,7 +393,7 @@ process_arguments (int argc, char **argv)
 
 <para>&PROTO_validate_arguments;</para>
 
-<para>Given a database name, this function returns TRUE if the string
+<para>Given a database name, this function returns true if the string
 is a valid PostgreSQL database name, and returns false if it is
 not.</para>
 
@@ -424,7 +424,7 @@ function prototype
 
 <para>&PROTO_is_pg_logname;</para>
 
-<para>Given a username, this function returns TRUE if the string is a
+<para>Given a username, this function returns true if the string is a
 valid PostgreSQL username, and returns false if it is not. Valid PostgreSQL
 usernames are less than &NAMEDATALEN; characters long and consist of
 letters, numbers, dashes, and underscores, plus possibly some other
@@ -439,12 +439,10 @@ should be added.</para>
 
 
 
-int
-is_pg_logname (char *username)
-{
+bool is_pg_logname (char *username) {
         if (strlen (username) > NAMEDATALEN - 1)
-                return (FALSE);
-        return (TRUE);
+                return (false);
+        return (true);
 }
 
 /******************************************************************************
diff --git a/plugins/check_ping.c b/plugins/check_ping.c
index 741f732e..6e162e6a 100644
--- a/plugins/check_ping.c
+++ b/plugins/check_ping.c
@@ -55,7 +55,7 @@ int error_scan (char buf[MAX_INPUT_BUFFER], const char *addr);
 void print_usage (void);
 void print_help (void);
 
-int display_html = FALSE;
+bool display_html = false;
 int wpl = UNKNOWN_PACKET_LOSS;
 int cpl = UNKNOWN_PACKET_LOSS;
 float wrta = UNKNOWN_TRIP_TIME;
@@ -153,7 +153,7 @@ main (int argc, char **argv)
                 if (n_addresses > 1 && this_result != STATE_UNKNOWN)
                         die (STATE_OK, "%s is alive\n", addresses[i]);
 
-                if (display_html == TRUE)
+                if (display_html == true)
                         printf ("<A HREF='%s/traceroute.cgi?%s'>", CGIURL, addresses[i]);
                 if (pl == 100)
                         printf (_("PING %s - %sPacket loss = %d%%"), state_text (this_result), warn_text,
@@ -161,22 +161,22 @@ main (int argc, char **argv)
                 else
                         printf (_("PING %s - %sPacket loss = %d%%, RTA = %2.2f ms"),
                                                         state_text (this_result), warn_text, pl, rta);
-                if (display_html == TRUE)
+                if (display_html == true)
                         printf ("</A>");
 
                 /* Print performance data */
                 if (pl != 100) {
                         printf("|%s", fperfdata ("rta", (double) rta, "ms",
-                                                                          wrta>0?TRUE:FALSE, wrta,
-                                                                          crta>0?TRUE:FALSE, crta,
-                                                                          TRUE, 0, FALSE, 0));
+                                                                          wrta>0?true:false, wrta,
+                                                                          crta>0?true:false, crta,
+                                                                          true, 0, false, 0));
                 } else {
                         printf("| rta=U;%f;%f;;", wrta, crta);
                 }
                 printf(" %s\n", perfdata ("pl", (long) pl, "%",
-                                          wpl>0?TRUE:FALSE, wpl,
-                                          cpl>0?TRUE:FALSE, cpl,
-                                          TRUE, 0, FALSE, 0));
+                                          wpl>0?true:false, wpl,
+                                          cpl>0?true:false, cpl,
+                                          true, 0, false, 0));
 
                 if (verbose >= 2)
                         printf ("%f:%d%% %f:%d%%\n", wrta, wpl, crta, cpl);
@@ -278,10 +278,10 @@ process_arguments (int argc, char **argv)
                                 usage2 (_("<max_packets> (%s) must be a non-negative number\n"), optarg);
                         break;
                 case 'n':       /* no HTML */
-                        display_html = FALSE;
+                        display_html = false;
                         break;
                 case 'L':       /* show HTML */
-                        display_html = TRUE;
+                        display_html = true;
                         break;
                 case 'c':
                         get_threshold (optarg, &crta, &cpl);
@@ -297,7 +297,7 @@ process_arguments (int argc, char **argv)
                 return validate_arguments ();
 
         if (addresses[0] == NULL) {
-                if (is_host (argv[c]) == FALSE) {
+                if (!is_host (argv[c])) {
                         usage2 (_("Invalid hostname/address"), argv[c]);
                 } else {
                         addresses[0] = argv[c++];
@@ -308,7 +308,7 @@ process_arguments (int argc, char **argv)
         }
 
         if (wpl == UNKNOWN_PACKET_LOSS) {
-                if (is_intpercent (argv[c]) == FALSE) {
+                if (!is_intpercent (argv[c])) {
                         printf (_("<wpl> (%s) must be an integer percentage\n"), argv[c]);
                         return ERROR;
                 } else {
@@ -319,7 +319,7 @@ process_arguments (int argc, char **argv)
         }
 
         if (cpl == UNKNOWN_PACKET_LOSS) {
-                if (is_intpercent (argv[c]) == FALSE) {
+                if (!is_intpercent (argv[c])) {
                         printf (_("<cpl> (%s) must be an integer percentage\n"), argv[c]);
                         return ERROR;
                 } else {
@@ -420,7 +420,7 @@ validate_arguments ()
                 timeout_interval = (int)max_seconds;
 
         for (i=0; i<n_addresses; i++) {
-                if (is_host(addresses[i]) == FALSE)
+                if (!is_host(addresses[i]))
                         usage2 (_("Invalid hostname/address"), addresses[i]);
         }
 
diff --git a/plugins/check_procs.c b/plugins/check_procs.c
index c17c6996..1fcbd981 100644
--- a/plugins/check_procs.c
+++ b/plugins/check_procs.c
@@ -14,6 +14,9 @@
 * defaults to number of processes.  Search filters can be applied to limit
 * the processes to check.
 *
+* The parent process, check_procs itself and any child process of 
+* check_procs (ps) are excluded from any checks to prevent false positives.
+*
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
@@ -153,7 +156,7 @@ main (int argc, char **argv)
         int expected_cols = PS_COLS - 1;
         int warn = 0; /* number of processes in warn state */
         int crit = 0; /* number of processes in crit state */
-        int i = 0, j = 0;
+        int i = 0;
         int result = STATE_UNKNOWN;
         int ret = 0;
         output chld_out, chld_err;
@@ -207,7 +210,7 @@ main (int argc, char **argv)
         }
 
         /* flush first line: j starts at 1 */
-        for (j = 1; j < chld_out.lines; j++) {
+        for (size_t j = 1; j < chld_out.lines; j++) {
                 input_line = chld_out.line[j];
 
                 if (verbose >= 3)
@@ -241,8 +244,9 @@ main (int argc, char **argv)
 
                         /* Ignore self */
                         if ((usepid && mypid == procpid) ||
-                                (!usepid && ((ret = stat_exe(procpid, &statbuf) != -1) && statbuf.st_dev == mydev && statbuf.st_ino == myino) ||
-                                 (ret == -1 && errno == ENOENT))) {
+                                ( ((!usepid) && ((ret = stat_exe(procpid, &statbuf) != -1) && statbuf.st_dev == mydev && statbuf.st_ino == myino)) ||
+                                 (ret == -1 && errno == ENOENT))
+                                ) {
                                 if (verbose >= 3)
                                          printf("not considering - is myself or gone\n");
                                 continue;
@@ -254,6 +258,13 @@ main (int argc, char **argv)
                                 continue;
                         }
 
+                        /* Ignore our own children */
+                        if (procppid == mypid) {
+                                if (verbose >= 3)
+                                         printf("not considering - is our child\n");
+                                continue;
+                        }
+
                         /* Ignore excluded processes by name */
                         if(options & EXCLUDE_PROGS) {
                           int found = 0;
@@ -727,18 +738,23 @@ convert_to_seconds(char *etime) {
 void
 print_help (void)
 {
-        print_revision (progname, NP_VERSION);
+  print_revision (progname, NP_VERSION);
 
-        printf ("Copyright (c) 1999 Ethan Galstad <nagios@nagios.org>\n");
-        printf (COPYRIGHT, copyright, email);
+  printf ("Copyright (c) 1999 Ethan Galstad <nagios@nagios.org>\n");
+  printf (COPYRIGHT, copyright, email);
 
-        printf ("%s\n", _("Checks all processes and generates WARNING or CRITICAL states if the specified"));
+  printf ("%s\n", _("Checks all processes and generates WARNING or CRITICAL states if the specified"));
   printf ("%s\n", _("metric is outside the required threshold ranges. The metric defaults to number"));
   printf ("%s\n", _("of processes.  Search filters can be applied to limit the processes to check."));
 
   printf ("\n\n");
 
-        print_usage ();
+  printf ("%s\n", _("The parent process, check_procs itself and any child process of check_procs (ps)"));
+  printf ("%s\n", _("are excluded from any checks to prevent false positives."));
+
+  printf ("\n\n");
+
+  print_usage ();
 
   printf (UT_HELP_VRSN);
   printf (UT_EXTRA_OPTS);
@@ -754,11 +770,11 @@ print_help (void)
   printf ("  %s\n", _("CPU     - percentage CPU"));
 /* only linux etime is support currently */
 #if defined( __linux__ )
-        printf ("  %s\n", _("ELAPSED - time elapsed in seconds"));
+  printf ("  %s\n", _("ELAPSED - time elapsed in seconds"));
 #endif /* defined(__linux__) */
-        printf (UT_PLUG_TIMEOUT, DEFAULT_SOCKET_TIMEOUT);
+  printf (UT_PLUG_TIMEOUT, DEFAULT_SOCKET_TIMEOUT);
 
-        printf (" %s\n", "-v, --verbose");
+  printf (" %s\n", "-v, --verbose");
   printf ("    %s\n", _("Extra information. Up to 3 verbosity levels"));
 
   printf (" %s\n", "-T, --traditional");
@@ -776,7 +792,7 @@ print_help (void)
   printf ("   %s\n", _("Only scan for processes with VSZ higher than indicated."));
   printf (" %s\n", "-r, --rss=RSS");
   printf ("   %s\n", _("Only scan for processes with RSS higher than indicated."));
-        printf (" %s\n", "-P, --pcpu=PCPU");
+  printf (" %s\n", "-P, --pcpu=PCPU");
   printf ("   %s\n", _("Only scan for processes with PCPU higher than indicated."));
   printf (" %s\n", "-u, --user=USER");
   printf ("   %s\n", _("Only scan for processes with user name or ID indicated."));
@@ -791,19 +807,19 @@ print_help (void)
   printf (" %s\n", "-k, --no-kthreads");
   printf ("   %s\n", _("Only scan for non kernel threads (works on Linux only)."));
 
-        printf(_("\n\
+  printf(_("\n\
 RANGEs are specified 'min:max' or 'min:' or ':max' (or 'max'). If\n\
 specified 'max:min', a warning status will be generated if the\n\
 count is inside the specified range\n\n"));
 
-        printf(_("\
+  printf(_("\
 This plugin checks the number of currently running processes and\n\
 generates WARNING or CRITICAL states if the process count is outside\n\
 the specified threshold ranges. The process count can be filtered by\n\
 process owner, parent process PID, current state (e.g., 'Z'), or may\n\
 be the total number of running processes\n\n"));
 
-        printf ("%s\n", _("Examples:"));
+  printf ("%s\n", _("Examples:"));
   printf (" %s\n", "check_procs -w 2:2 -c 2:1024 -C portsentry");
   printf ("  %s\n", _("Warning if not two processes with command name portsentry."));
   printf ("  %s\n\n", _("Critical if < 2 or > 1024 processes"));
@@ -820,14 +836,14 @@ be the total number of running processes\n\n"));
   printf (" %s\n", "check_procs -w 10 -c 20 --metric=CPU");
   printf ("  %s\n", _("Alert if CPU of any processes over 10\% or 20\%"));
 
-        printf (UT_SUPPORT);
+  printf (UT_SUPPORT);
 }
 
 void
 print_usage (void)
 {
   printf ("%s\n", _("Usage:"));
-        printf ("%s -w <range> -c <range> [-m metric] [-s state] [-p ppid]\n", progname);
+  printf ("%s -w <range> -c <range> [-m metric] [-s state] [-p ppid]\n", progname);
   printf (" [-u user] [-r rss] [-z vsz] [-P %%cpu] [-a argument-array]\n");
   printf (" [-C command] [-X process_to_exclude] [-k] [-t timeout] [-v]\n");
 }
diff --git a/plugins/check_radius.c b/plugins/check_radius.c
index b1b4938c..6b32710a 100644
--- a/plugins/check_radius.c
+++ b/plugins/check_radius.c
@@ -93,7 +93,7 @@ char *expect = NULL;
 char *config_file = NULL;
 unsigned short port = PW_AUTH_UDP_PORT;
 int retries = 1;
-int verbose = FALSE;
+bool verbose = false;
 
 /******************************************************************************
 
@@ -272,10 +272,10 @@ process_arguments (int argc, char **argv)
                         print_revision (progname, NP_VERSION);
                         exit (STATE_UNKNOWN);
                 case 'v':                                                                       /* verbose mode */
-                        verbose = TRUE;
+                        verbose = true;
                         break;
                 case 'H':                                                                       /* hostname */
-                        if (is_host (optarg) == FALSE) {
+                        if (!is_host (optarg)) {
                                 usage2 (_("Invalid hostname/address"), optarg);
                         }
                         server = optarg;
diff --git a/plugins/check_real.c b/plugins/check_real.c
index fbdb70f3..15e035b6 100644
--- a/plugins/check_real.c
+++ b/plugins/check_real.c
@@ -54,10 +54,10 @@ char *host_name;
 char *server_url = NULL;
 char *server_expect;
 int warning_time = 0;
-int check_warning_time = FALSE;
+bool check_warning_time = false;
 int critical_time = 0;
-int check_critical_time = FALSE;
-int verbose = FALSE;
+bool check_critical_time = false;
+bool verbose = false;
 
 
 
@@ -238,9 +238,9 @@ main (int argc, char **argv)
         /* Return results */
         if (result == STATE_OK) {
 
-                if (check_critical_time == TRUE
+                if (check_critical_time
                                 && (end_time - start_time) > critical_time) result = STATE_CRITICAL;
-                else if (check_warning_time == TRUE
+                else if (check_warning_time
                                                  && (end_time - start_time) > warning_time) result =
                                 STATE_WARNING;
 
@@ -331,7 +331,7 @@ process_arguments (int argc, char **argv)
                 case 'w':                                                                       /* warning time threshold */
                         if (is_intnonneg (optarg)) {
                                 warning_time = atoi (optarg);
-                                check_warning_time = TRUE;
+                                check_warning_time = true;
                         }
                         else {
                                 usage4 (_("Warning time must be a positive integer"));
@@ -340,14 +340,14 @@ process_arguments (int argc, char **argv)
                 case 'c':                                                                       /* critical time threshold */
                         if (is_intnonneg (optarg)) {
                                 critical_time = atoi (optarg);
-                                check_critical_time = TRUE;
+                                check_critical_time = true;
                         }
                         else {
                                 usage4 (_("Critical time must be a positive integer"));
                         }
                         break;
                 case 'v':                                                                       /* verbose */
-                        verbose = TRUE;
+                        verbose = true;
                         break;
                 case 't':                                                                       /* timeout */
                         if (is_intnonneg (optarg)) {
diff --git a/plugins/check_smtp.c b/plugins/check_smtp.c
index fc0ae2c4..986c3e18 100644
--- a/plugins/check_smtp.c
+++ b/plugins/check_smtp.c
@@ -40,7 +40,7 @@ const char *email = "devel@monitoring-plugins.org";
 #include <ctype.h>
 
 #ifdef HAVE_SSL
-int check_cert = FALSE;
+bool check_cert = false;
 int days_till_exp_warn, days_till_exp_crit;
 #  define my_recv(buf, len) (((use_starttls || use_ssl) && ssl_established) ? np_net_ssl_read(buf, len) : read(sd, buf, len))
 #  define my_send(buf, len) (((use_starttls || use_ssl) && ssl_established) ? np_net_ssl_write(buf, len) : send(sd, buf, len, 0))
@@ -100,17 +100,17 @@ char *authtype = NULL;
 char *authuser = NULL;
 char *authpass = NULL;
 double warning_time = 0;
-int check_warning_time = FALSE;
+bool check_warning_time = false;
 double critical_time = 0;
-int check_critical_time = FALSE;
+bool check_critical_time = false;
 int verbose = 0;
-int use_ssl = FALSE;
-int use_starttls = FALSE;
-int use_sni = FALSE;
-short use_proxy_prefix = FALSE;
-short use_ehlo = FALSE;
-short use_lhlo = FALSE;
-short ssl_established = 0;
+bool use_ssl = false;
+bool use_starttls = false;
+bool use_sni = false;
+bool use_proxy_prefix = false;
+bool use_ehlo = false;
+bool use_lhlo = false;
+bool ssl_established = false;
 char *localhostname = NULL;
 int sd;
 char buffer[MAX_INPUT_BUFFER];
@@ -118,13 +118,13 @@ enum {
   TCP_PROTOCOL = 1,
   UDP_PROTOCOL = 2,
 };
-int ignore_send_quit_failure = FALSE;
+bool ignore_send_quit_failure = false;
 
 
 int
 main (int argc, char **argv)
 {
-        short supports_tls=FALSE;
+        bool supports_tls = false;
         int n = 0;
         double elapsed_time;
         long microsec;
@@ -230,7 +230,7 @@ main (int argc, char **argv)
                 } else if(use_ehlo || use_lhlo){
                         if(strstr(buffer, "250 STARTTLS") != NULL ||
                            strstr(buffer, "250-STARTTLS") != NULL){
-                                supports_tls=TRUE;
+                                supports_tls=true;
                         }
                 }
 
@@ -466,7 +466,7 @@ main (int argc, char **argv)
                         fperfdata ("time", elapsed_time, "s",
                                 (int)check_warning_time, warning_time,
                                 (int)check_critical_time, critical_time,
-                                TRUE, 0, FALSE, 0));
+                                true, 0, false, 0));
 
         return result;
 }
@@ -480,6 +480,8 @@ process_arguments (int argc, char **argv)
         int c;
         char* temp;
 
+        bool implicit_tls = false;
+
         enum {
           SNI_OPTION
         };
@@ -560,7 +562,7 @@ process_arguments (int argc, char **argv)
                         break;
                 case 'A':
                         authtype = optarg;
-                        use_ehlo = TRUE;
+                        use_ehlo = true;
                         break;
                 case 'U':
                         authuser = optarg;
@@ -600,7 +602,7 @@ process_arguments (int argc, char **argv)
                                 usage4 (_("Critical time must be a positive"));
                         else {
                                 critical_time = strtod (optarg, NULL);
-                                check_critical_time = TRUE;
+                                check_critical_time = true;
                         }
                         break;
                 case 'w':                                                                       /* warning time threshold */
@@ -608,14 +610,14 @@ process_arguments (int argc, char **argv)
                                 usage4 (_("Warning time must be a positive"));
                         else {
                                 warning_time = strtod (optarg, NULL);
-                                check_warning_time = TRUE;
+                                check_warning_time = true;
                         }
                         break;
                 case 'v':                                                                       /* verbose */
                         verbose++;
                         break;
                 case 'q':
-                        ignore_send_quit_failure++;             /* ignore problem sending QUIT */
+                        ignore_send_quit_failure = true;             /* ignore problem sending QUIT */
                         break;
                 case 't':                                                                       /* timeout */
                         if (is_intnonneg (optarg)) {
@@ -645,33 +647,35 @@ process_arguments (int argc, char **argv)
                                 usage2 ("Invalid certificate expiration period", optarg);
                             days_till_exp_warn = atoi (optarg);
                         }
-                        check_cert = TRUE;
-                        ignore_send_quit_failure = TRUE;
+                        check_cert = true;
+                        ignore_send_quit_failure = true;
 #else
                         usage (_("SSL support not available - install OpenSSL and recompile"));
 #endif
+                        implicit_tls = true;
+                        // fallthrough
                 case 's':
                 /* ssl */
-                        use_ssl = TRUE;
+                        use_ssl = true;
                         server_port = SMTPS_PORT;
                         break;
                 case 'S':
                 /* starttls */
-                        use_starttls = TRUE;
-                        use_ehlo = TRUE;
+                        use_starttls = true;
+                        use_ehlo = true;
                         break;
                 case SNI_OPTION:
 #ifdef HAVE_SSL
-                        use_sni = TRUE;
+                        use_sni = true;
 #else
                         usage (_("SSL support not available - install OpenSSL and recompile"));
 #endif
                         break;
                 case 'r':
-                        use_proxy_prefix = TRUE;
+                        use_proxy_prefix = true;
                         break;
                 case 'L':
-                        use_lhlo = TRUE;
+                        use_lhlo = true;
                         break;
                 case '4':
                         address_family = AF_INET;
@@ -717,7 +721,12 @@ process_arguments (int argc, char **argv)
                 from_arg = strdup(" ");
 
         if (use_starttls && use_ssl) {
-                usage4 (_("Set either -s/--ssl/--tls or -S/--starttls"));
+                if (implicit_tls) {
+                        use_ssl = false;
+                        server_port = SMTP_PORT;
+                } else {
+                        usage4 (_("Set either -s/--ssl/--tls or -S/--starttls"));
+                }
         }
 
         if (server_port_option != 0) {
diff --git a/plugins/check_snmp.c b/plugins/check_snmp.c
index 56a586ad..90a04027 100644
--- a/plugins/check_snmp.c
+++ b/plugins/check_snmp.c
@@ -55,8 +55,6 @@ const char *email = "devel@monitoring-plugins.org";
 #define CRIT_STRING 2
 #define CRIT_REGEX 4
 #define WARN_PRESENT 8
-#define WARN_STRING 16
-#define WARN_REGEX 32
 
 #define OID_COUNT_STEP 8
 
@@ -86,82 +84,82 @@ const char *email = "devel@monitoring-plugins.org";
 
 
 
-int process_arguments (int, char **);
-int validate_arguments (void);
-char *thisarg (char *str);
-char *nextarg (char *str);
+static int process_arguments (int, char **);
+static int validate_arguments (void);
+static char *thisarg (char *str);
+static char *nextarg (char *str);
 void print_usage (void);
-void print_help (void);
-char *multiply (char *str);
+static void print_help (void);
+static char *multiply (char *str);
 
 #include "regex.h"
-char regex_expect[MAX_INPUT_BUFFER] = "";
-regex_t preg;
-regmatch_t pmatch[10];
-char errbuf[MAX_INPUT_BUFFER] = "";
-char perfstr[MAX_INPUT_BUFFER] = "| ";
-int cflags = REG_EXTENDED | REG_NOSUB | REG_NEWLINE;
-int eflags = 0;
-int errcode, excode;
-
-char *server_address = NULL;
-char *community = NULL;
-char **contextargs = NULL;
-char *context = NULL;
-char **authpriv = NULL;
-char *proto = NULL;
-char *seclevel = NULL;
-char *secname = NULL;
-char *authproto = NULL;
-char *privproto = NULL;
-char *authpasswd = NULL;
-char *privpasswd = NULL;
-int nulloid = STATE_UNKNOWN;
-char **oids = NULL;
-size_t oids_size = 0;
-char *label;
-char *units;
-char *port;
-char *snmpcmd;
-char string_value[MAX_INPUT_BUFFER] = "";
-int  invert_search=0;
-char **labels = NULL;
-char **unitv = NULL;
-size_t nlabels = 0;
-size_t labels_size = OID_COUNT_STEP;
-size_t nunits = 0;
-size_t unitv_size = OID_COUNT_STEP;
-int numoids = 0;
-int numauthpriv = 0;
-int numcontext = 0;
-int verbose = 0;
-int usesnmpgetnext = FALSE;
-char *warning_thresholds = NULL;
-char *critical_thresholds = NULL;
-thresholds **thlds;
-size_t thlds_size = OID_COUNT_STEP;
-double *response_value;
-size_t response_size = OID_COUNT_STEP;
-int retries = 0;
-int *eval_method;
-size_t eval_size = OID_COUNT_STEP;
-char *delimiter;
-char *output_delim;
-char *miblist = NULL;
-int needmibs = FALSE;
-int calculate_rate = 0;
-double offset = 0.0;
-int rate_multiplier = 1;
-state_data *previous_state;
-double *previous_value;
-size_t previous_size = OID_COUNT_STEP;
-int perf_labels = 1;
-char* ip_version = "";
-double multiplier = 1.0;
-char *fmtstr = "";
-bool fmtstr_set = false;
-char buffer[DEFAULT_BUFFER_SIZE];
-bool ignore_mib_parsing_errors = false;
+static char regex_expect[MAX_INPUT_BUFFER] = "";
+static regex_t preg;
+static regmatch_t pmatch[10];
+static char errbuf[MAX_INPUT_BUFFER] = "";
+static char perfstr[MAX_INPUT_BUFFER] = "| ";
+static int cflags = REG_EXTENDED | REG_NOSUB | REG_NEWLINE;
+static int eflags = 0;
+static int errcode, excode;
+
+static char *server_address = NULL;
+static char *community = NULL;
+static char **contextargs = NULL;
+static char *context = NULL;
+static char **authpriv = NULL;
+static char *proto = NULL;
+static char *seclevel = NULL;
+static char *secname = NULL;
+static char *authproto = NULL;
+static char *privproto = NULL;
+static char *authpasswd = NULL;
+static char *privpasswd = NULL;
+static int nulloid = STATE_UNKNOWN;
+static char **oids = NULL;
+static size_t oids_size = 0;
+static char *label;
+static char *units;
+static char *port;
+static char *snmpcmd;
+static char string_value[MAX_INPUT_BUFFER] = "";
+static int  invert_search=0;
+static char **labels = NULL;
+static char **unitv = NULL;
+static size_t nlabels = 0;
+static size_t labels_size = OID_COUNT_STEP;
+static size_t nunits = 0;
+static size_t unitv_size = OID_COUNT_STEP;
+static size_t numoids = 0;
+static int numauthpriv = 0;
+static int numcontext = 0;
+static int verbose = 0;
+static bool usesnmpgetnext = false;
+static char *warning_thresholds = NULL;
+static char *critical_thresholds = NULL;
+static thresholds **thlds;
+static size_t thlds_size = OID_COUNT_STEP;
+static double *response_value;
+static size_t response_size = OID_COUNT_STEP;
+static int retries = 0;
+static int *eval_method;
+static size_t eval_size = OID_COUNT_STEP;
+static char *delimiter;
+static char *output_delim;
+static char *miblist = NULL;
+static bool needmibs = false;
+static int calculate_rate = 0;
+static double offset = 0.0;
+static int rate_multiplier = 1;
+static state_data *previous_state;
+static double *previous_value;
+static size_t previous_size = OID_COUNT_STEP;
+static int perf_labels = 1;
+static char* ip_version = "";
+static double multiplier = 1.0;
+static char *fmtstr = "";
+static bool fmtstr_set = false;
+static char buffer[DEFAULT_BUFFER_SIZE];
+static bool ignore_mib_parsing_errors = false;
 
 static char *fix_snmp_range(char *th)
 {
@@ -187,7 +185,8 @@ static char *fix_snmp_range(char *th)
 int
 main (int argc, char **argv)
 {
-        int i, len, line, total_oids;
+        int len, total_oids;
+        size_t line;
         unsigned int bk_count = 0, dq_count = 0;
         int iresult = STATE_UNKNOWN;
         int result = STATE_UNKNOWN;
@@ -253,14 +252,16 @@ main (int argc, char **argv)
         if(calculate_rate) {
                 if (!strcmp(label, "SNMP"))
                         label = strdup("SNMP RATE");
-                i=0;
+
+                size_t i = 0;
+
                 previous_state = np_state_read();
                 if(previous_state!=NULL) {
                         /* Split colon separated values */
                         previous_string = strdup((char *) previous_state->data);
                         while((ap = strsep(&previous_string, ":")) != NULL) {
                                 if(verbose>2)
-                                        printf("State for %d=%s\n", i, ap);
+                                        printf("State for %zd=%s\n", i, ap);
                                 while (i >= previous_size) {
                                         previous_size += OID_COUNT_STEP;
                                         previous_value = realloc(previous_value, previous_size * sizeof(*previous_value));
@@ -273,7 +274,7 @@ main (int argc, char **argv)
         /* Populate the thresholds */
         th_warn=warning_thresholds;
         th_crit=critical_thresholds;
-        for (i=0; i<numoids; i++) {
+        for (size_t i = 0; i < numoids; i++) {
                 char *w = th_warn ? strndup(th_warn, strcspn(th_warn, ",")) : NULL;
                 char *c = th_crit ? strndup(th_crit, strcspn(th_crit, ",")) : NULL;
                 /* translate "2:1" to "@1:2" for backwards compatibility */
@@ -302,7 +303,7 @@ main (int argc, char **argv)
         }
 
         /* Create the command array to execute */
-        if(usesnmpgetnext == TRUE) {
+        if(usesnmpgetnext) {
                 snmpcmd = strdup (PATH_TO_SNMPGETNEXT);
         }else{
                 snmpcmd = strdup (PATH_TO_SNMPGET);
@@ -333,11 +334,11 @@ main (int argc, char **argv)
         }
 
 
-        for (i = 0; i < numcontext; i++) {
+        for (int i = 0; i < numcontext; i++) {
                 command_line[index++] = contextargs[i];
         }
 
-        for (i = 0; i < numauthpriv; i++) {
+        for (int i = 0; i < numauthpriv; i++) {
                 command_line[index++] = authpriv[i];
         }
 
@@ -348,7 +349,7 @@ main (int argc, char **argv)
          server_address,
          port);
 
-        for (i = 0; i < numoids; i++) {
+        for (size_t i = 0; i < numoids; i++) {
                 command_line[index++] = oids[i];
                 xasprintf(&cl_hidden_auth, "%s %s", cl_hidden_auth, oids[i]);
         }
@@ -382,7 +383,7 @@ main (int argc, char **argv)
         if (external_error) {
                 if (chld_err.lines > 0) {
                         printf (_("External command error: %s\n"), chld_err.line[0]);
-                        for (i = 1; i < chld_err.lines; i++) {
+                        for (size_t i = 1; i < chld_err.lines; i++) {
                                 printf ("%s\n", chld_err.line[i]);
                         }
                 } else {
@@ -392,12 +393,14 @@ main (int argc, char **argv)
         }
 
         if (verbose) {
-                for (i = 0; i < chld_out.lines; i++) {
+                for (size_t i = 0; i < chld_out.lines; i++) {
                         printf ("%s\n", chld_out.line[i]);
                 }
         }
 
-        for (line=0, i=0; line < chld_out.lines && i < numoids ; line++, i++) {
+        line = 0;
+        total_oids = 0;
+        for (size_t i = 0; line < chld_out.lines && i < numoids ; line++, i++, total_oids++) {
                 if(calculate_rate)
                         conv = "%.10g";
                 else
@@ -410,7 +413,7 @@ main (int argc, char **argv)
                         break;
 
                 if (verbose > 2) {
-                        printf("Processing oid %i (line %i)\n  oidname: %s\n  response: %s\n", i+1, line+1, oidname, response);
+                        printf("Processing oid %zi (line %zi)\n  oidname: %s\n  response: %s\n", i+1, line+1, oidname, response);
                 }
 
                 /* Clean up type array - Sol10 does not necessarily zero it out */
@@ -634,7 +637,6 @@ main (int argc, char **argv)
                         strncat(perfstr, " ", sizeof(perfstr)-strlen(perfstr)-1);
                 }
         }
-        total_oids=i;
 
         /* Save state data, as all data collected now */
         if(calculate_rate) {
@@ -644,7 +646,7 @@ main (int argc, char **argv)
                         die(STATE_UNKNOWN, _("Cannot malloc"));
 
                 current_length=0;
-                for(i=0; i<total_oids; i++) {
+                for(int i = 0; i < total_oids; i++) {
                         xasprintf(&temp_string,"%.0f",response_value[i]);
                         if(temp_string==NULL)
                                 die(STATE_UNKNOWN,_("Cannot asprintf()"));
@@ -687,7 +689,7 @@ process_arguments (int argc, char **argv)
 {
         char *ptr;
         int c = 1;
-        int j = 0, jj = 0, ii = 0;
+        size_t j = 0, jj = 0;
 
         int option = 0;
         static struct option longopts[] = {
@@ -777,7 +779,7 @@ process_arguments (int argc, char **argv)
                         miblist = optarg;
                         break;
                 case 'n':       /* usesnmpgetnext */
-                        usesnmpgetnext = TRUE;
+                        usesnmpgetnext = true;
                         break;
                 case 'P':       /* SNMP protocol version */
                         proto = optarg;
@@ -831,7 +833,7 @@ process_arguments (int argc, char **argv)
                                          * so we have a mib variable, rather than just an SNMP OID,
                                          * so we have to actually read the mib files
                                          */
-                                        needmibs = TRUE;
+                                        needmibs = true;
                         }
                         for (ptr = strtok(optarg, ", "); ptr != NULL; ptr = strtok(NULL, ", "), j++) {
                                 while (j >= oids_size) {
@@ -843,7 +845,6 @@ process_arguments (int argc, char **argv)
                         numoids = j;
                         if (c == 'E' || c == 'e') {
                                 jj++;
-                                ii++;
                                 while (j+1 >= eval_size) {
                                         eval_size += OID_COUNT_STEP;
                                         eval_method = realloc(eval_method, eval_size * sizeof(*eval_method));
@@ -870,7 +871,6 @@ process_arguments (int argc, char **argv)
                                 memset(eval_method + eval_size - OID_COUNT_STEP, 0, 8);
                         }
                         eval_method[jj++] = CRIT_STRING;
-                        ii++;
                         break;
                 case 'R':                                                                       /* regex */
                         cflags = REG_ICASE;
@@ -891,7 +891,6 @@ process_arguments (int argc, char **argv)
                                 memset(eval_method + eval_size - OID_COUNT_STEP, 0, 8);
                         }
                         eval_method[jj++] = CRIT_REGEX;
-                        ii++;
                         break;
 
         /* Format */
@@ -1029,12 +1028,12 @@ selected.</para>
 
 
 
-int
+static int
 validate_arguments ()
 {
         /* check whether to load locally installed MIBS (CPU/disk intensive) */
         if (miblist == NULL) {
-                if ( needmibs == TRUE ) {
+                if (needmibs) {
                         miblist = strdup (DEFAULT_MIBLIST);
                 }else{
                         miblist = "";                   /* don't read any mib files for numeric oids */
@@ -1138,7 +1137,7 @@ validate_arguments ()
 /* trim leading whitespace
          if there is a leading quote, make sure it balances */
 
-char *
+static char *
 thisarg (char *str)
 {
         str += strspn (str, " \t\r\n"); /* trim any leading whitespace */
@@ -1155,7 +1154,7 @@ thisarg (char *str)
          set the trailing quote to '\x0'
          if the string continues, advance beyond the comma */
 
-char *
+static char *
 nextarg (char *str)
 {
         if (str[0] == '\'') {
@@ -1187,7 +1186,7 @@ nextarg (char *str)
 
 
 /* multiply result (values 0 < n < 1 work as divider) */
-char *
+static char *
 multiply (char *str)
 {
         char *endptr;
@@ -1224,7 +1223,7 @@ multiply (char *str)
 }
 
 
-void
+static void
 print_help (void)
 {
         print_revision (progname, NP_VERSION);
@@ -1252,10 +1251,12 @@ print_help (void)
         printf ("    %s\n", _("SNMPv3 context"));
         printf (" %s\n", "-L, --seclevel=[noAuthNoPriv|authNoPriv|authPriv]");
         printf ("    %s\n", _("SNMPv3 securityLevel"));
-        printf (" %s\n", "-a, --authproto=[MD5|SHA]");
-        printf ("    %s\n", _("SNMPv3 auth proto"));
-        printf (" %s\n", "-x, --privproto=[DES|AES]");
-        printf ("    %s\n", _("SNMPv3 priv proto (default DES)"));
+        printf (" %s\n", "-a, --authproto=AUTHENTICATION_PROTOCOL");
+        printf ("    %s\n", _("SNMPv3 authentication protocol (default MD5), available options depend on the specific version of the net-snmp tools"));
+        printf ("    %s\n", _("if < 5.8 SHA (1) and MD5 should be available, if >= 5.8 additionally SHA-224, SHA-256, SHA-384 and SHA-512"));
+        printf (" %s\n", "-x, --privproto=PRIVACY_PROTOCOL");
+        printf ("    %s\n", _("SNMPv3 privacy protocol (default DES), available options depend on the specific version of the net-snmp tools"));
+        printf ("    %s\n", _("if < 5.8 DES and AES should be available, if >= 5.8 additionally AES-192 and AES-256"));
 
         /* Authentication Tokens*/
         printf (" %s\n", "-C, --community=STRING");
diff --git a/plugins/check_ssh.c b/plugins/check_ssh.c
index 8ccbd5a7..34ef37b7 100644
--- a/plugins/check_ssh.c
+++ b/plugins/check_ssh.c
@@ -1,39 +1,39 @@
 /*****************************************************************************
-* 
+*
 * Monitoring check_ssh plugin
-* 
+*
 * License: GPL
 * Copyright (c) 2000-2007 Monitoring Plugins Development Team
-* 
+*
 * Description:
-* 
+*
 * This file contains the check_ssh plugin
-* 
+*
 * Try to connect to an SSH server at specified server and port
-* 
-* 
+*
+*
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
-* 
+*
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
-* 
+*
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
-* 
-* 
+*
+*
 *****************************************************************************/
 
 const char *progname = "check_ssh";
 const char *copyright = "2000-2007";
 const char *email = "devel@monitoring-plugins.org";
 
-#include "common.h"
-#include "netutils.h"
+#include "./common.h"
+#include "./netutils.h"
 #include "utils.h"
 
 #ifndef MSG_DONTWAIT
@@ -47,7 +47,7 @@ int port = -1;
 char *server_name = NULL;
 char *remote_version = NULL;
 char *remote_protocol = NULL;
-int verbose = FALSE;
+bool verbose = false;
 
 int process_arguments (int, char **);
 int validate_arguments (void);
@@ -57,7 +57,6 @@ void print_usage (void);
 int ssh_connect (char *haddr, int hport, char *remote_version, char *remote_protocol);
 
 
-
 int
 main (int argc, char **argv)
 {
@@ -106,7 +105,7 @@ process_arguments (int argc, char **argv)
                 {"timeout", required_argument, 0, 't'},
                 {"verbose", no_argument, 0, 'v'},
                 {"remote-version", required_argument, 0, 'r'},
-                {"remote-protcol", required_argument, 0, 'P'},
+                {"remote-protocol", required_argument, 0, 'P'},
                 {0, 0, 0, 0}
         };
 
@@ -133,7 +132,7 @@ process_arguments (int argc, char **argv)
                         print_help ();
                         exit (STATE_UNKNOWN);
                 case 'v':                                                                       /* verbose */
-                        verbose = TRUE;
+                        verbose = true;
                         break;
                 case 't':                                                                       /* timeout period */
                         if (!is_integer (optarg))
@@ -158,7 +157,7 @@ process_arguments (int argc, char **argv)
                         remote_protocol = optarg;
                         break;
                 case 'H':                                                                       /* host */
-                        if (is_host (optarg) == FALSE)
+                        if (!is_host (optarg))
                                 usage2 (_("Invalid hostname/address"), optarg);
                         server_name = optarg;
                         break;
@@ -215,7 +214,9 @@ ssh_connect (char *haddr, int hport, char *remote_version, char *remote_protocol
 {
         int sd;
         int result;
-        char *output = NULL;
+        int len = 0;
+        ssize_t recv_ret = 0;
+        char *version_control_string = NULL;
         char *buffer = NULL;
         char *ssh_proto = NULL;
         char *ssh_server = NULL;
@@ -230,52 +231,126 @@ ssh_connect (char *haddr, int hport, char *remote_version, char *remote_protocol
         if (result != STATE_OK)
                 return result;
 
-        output = (char *) malloc (BUFF_SZ + 1);
-        memset (output, 0, BUFF_SZ + 1);
-        recv (sd, output, BUFF_SZ, 0);
-        if (strncmp (output, "SSH", 3)) {
-                printf (_("Server answer: %s"), output);
-                close(sd);
+        char *output = (char *) calloc (BUFF_SZ + 1, sizeof(char));
+
+        unsigned int iteration = 0;
+        ssize_t byte_offset = 0;
+
+        while ((version_control_string == NULL) && (recv_ret = recv(sd, output+byte_offset, BUFF_SZ - byte_offset, 0) > 0)) {
+
+                if (strchr(output, '\n')) { /* we've got at least one full line, start parsing*/
+                        byte_offset = 0;
+
+                        char *index = NULL;
+                        while ((index = strchr(output+byte_offset, '\n')) != NULL) {
+                                /*Partition the buffer so that this line is a separate string,
+                                 * by replacing the newline with NUL*/
+                                output[(index - output)] = '\0';
+                                len = strlen(output + byte_offset);
+
+                                if ((len >= 4) && (strncmp (output+byte_offset, "SSH-", 4) == 0)) {
+                                        /*if the string starts with SSH-, this _should_ be a valid version control string*/
+                                                version_control_string = output+byte_offset;
+                                                break;
+                                }
+
+                                /*the start of the next line (if one exists) will be after the current one (+ NUL)*/
+                                byte_offset += (len + 1);
+                        }
+
+                        if(version_control_string == NULL) {
+                                /* move unconsumed data to beginning of buffer, null rest */
+                                memmove((void *)output, (void *)output+byte_offset+1, BUFF_SZ - len+1);
+                                memset(output+byte_offset+1, 0, BUFF_SZ-byte_offset+1);
+
+                                /*start reading from end of current line chunk on next recv*/
+                                byte_offset = strlen(output);
+                        }
+                } else {
+                        byte_offset += recv_ret;
+                }
+        }
+
+        if (recv_ret < 0) {
+                printf("SSH CRITICAL - %s", strerror(errno));
+                exit(STATE_CRITICAL);
+        }
+
+        if (version_control_string == NULL) {
+                printf("SSH CRITICAL - No version control string received");
+                exit(STATE_CRITICAL);
+        }
+        /*
+         * "When the connection has been established, both sides MUST send an
+         * identification string.  This identification string MUST be
+         *
+         * SSH-protoversion-softwareversion SP comments CR LF"
+         *              - RFC 4253:4.2
+         */
+        strip (version_control_string);
+        if (verbose)
+                printf ("%s\n", version_control_string);
+        ssh_proto = version_control_string + 4;
+
+        /*
+         * We assume the protoversion is of the form Major.Minor, although
+         * this is not _strictly_ required. See
+         *
+         * "Both the 'protoversion' and 'softwareversion' strings MUST consist of
+         * printable US-ASCII characters, with the exception of whitespace
+         * characters and the minus sign (-)"
+         *              - RFC 4253:4.2
+         * and,
+         *
+         * "As stated earlier, the 'protoversion' specified for this protocol is
+         * "2.0".  Earlier versions of this protocol have not been formally
+         * documented, but it is widely known that they use 'protoversion' of
+         * "1.x" (e.g., "1.5" or "1.3")."
+         *              - RFC 4253:5
+         */
+        ssh_server = ssh_proto + strspn (ssh_proto, "0123456789.") + 1; /* (+1 for the '-' separating protoversion from softwareversion) */
+
+        /* If there's a space in the version string, whatever's after the space is a comment
+         * (which is NOT part of the server name/version)*/
+        char *tmp = strchr(ssh_server, ' ');
+        if (tmp) {
+                ssh_server[tmp - ssh_server] = '\0';
+        }
+        if (strlen(ssh_proto) == 0 || strlen(ssh_server) == 0) {
+                printf(_("SSH CRITICAL - Invalid protocol version control string %s\n"), version_control_string);
                 exit (STATE_CRITICAL);
         }
-        else {
-                strip (output);
-                if (verbose)
-                        printf ("%s\n", output);
-                ssh_proto = output + 4;
-                ssh_server = ssh_proto + strspn (ssh_proto, "-0123456789. ");
-                ssh_proto[strspn (ssh_proto, "0123456789. ")] = 0;
-
-                xasprintf (&buffer, "SSH-%s-check_ssh_%s\r\n", ssh_proto, rev_no);
-                send (sd, buffer, strlen (buffer), MSG_DONTWAIT);
-                if (verbose)
-                        printf ("%s\n", buffer);
-
-                if (remote_version && strcmp(remote_version, ssh_server)) {
-                        printf
-                                (_("SSH CRITICAL - %s (protocol %s) version mismatch, expected '%s'\n"),
-                                 ssh_server, ssh_proto, remote_version);
-                        close(sd);
-                        exit (STATE_CRITICAL);
-                }
+        ssh_proto[strspn (ssh_proto, "0123456789. ")] = 0;
 
-                if (remote_protocol && strcmp(remote_protocol, ssh_proto)) {
-                        printf
-                                (_("SSH CRITICAL - %s (protocol %s) protocol version mismatch, expected '%s'\n"),
-                                 ssh_server, ssh_proto, remote_protocol);
-                        close(sd);
-                        exit (STATE_CRITICAL);
-                }
+        xasprintf (&buffer, "SSH-%s-check_ssh_%s\r\n", ssh_proto, rev_no);
+        send (sd, buffer, strlen (buffer), MSG_DONTWAIT);
+        if (verbose)
+                printf ("%s\n", buffer);
 
-                elapsed_time = (double)deltime(tv) / 1.0e6;
+        if (remote_version && strcmp(remote_version, ssh_server)) {
+                printf
+                        (_("SSH CRITICAL - %s (protocol %s) version mismatch, expected '%s'\n"),
+                         ssh_server, ssh_proto, remote_version);
+                close(sd);
+                exit (STATE_CRITICAL);
+        }
 
+        if (remote_protocol && strcmp(remote_protocol, ssh_proto)) {
                 printf
-                        (_("SSH OK - %s (protocol %s) | %s\n"),
-                         ssh_server, ssh_proto, fperfdata("time", elapsed_time, "s",
-                         FALSE, 0, FALSE, 0, TRUE, 0, TRUE, (int)socket_timeout));
+                        (_("SSH CRITICAL - %s (protocol %s) protocol version mismatch, expected '%s' | %s\n"),
+                         ssh_server, ssh_proto, remote_protocol, fperfdata("time", elapsed_time, "s",
+                         false, 0, false, 0, true, 0, true, (int)socket_timeout));
                 close(sd);
-                exit (STATE_OK);
+                exit (STATE_CRITICAL);
         }
+        elapsed_time = (double)deltime(tv) / 1.0e6;
+
+        printf
+                (_("SSH OK - %s (protocol %s) | %s\n"),
+                 ssh_server, ssh_proto, fperfdata("time", elapsed_time, "s",
+                         false, 0, false, 0, true, 0, true, (int)socket_timeout));
+        close(sd);
+        exit (STATE_OK);
 }
 
 
@@ -293,7 +368,7 @@ print_help (void)
 
         printf ("%s\n", _("Try to connect to an SSH server at specified server and port"));
 
-  printf ("\n\n");
+        printf ("\n\n");
 
         print_usage ();
 
@@ -307,10 +382,10 @@ print_help (void)
         printf (UT_CONN_TIMEOUT, DEFAULT_SOCKET_TIMEOUT);
 
         printf (" %s\n", "-r, --remote-version=STRING");
-  printf ("    %s\n", _("Alert if string doesn't match expected server version (ex: OpenSSH_3.9p1)"));
+        printf ("    %s\n", _("Alert if string doesn't match expected server version (ex: OpenSSH_3.9p1)"));
 
         printf (" %s\n", "-P, --remote-protocol=STRING");
-  printf ("    %s\n", _("Alert if protocol doesn't match expected protocol version (ex: 2.0)"));
+        printf ("    %s\n", _("Alert if protocol doesn't match expected protocol version (ex: 2.0)"));
 
         printf (UT_VERBOSE);
 
@@ -322,7 +397,7 @@ print_help (void)
 void
 print_usage (void)
 {
-  printf ("%s\n", _("Usage:"));
+        printf ("%s\n", _("Usage:"));
         printf ("%s  [-4|-6] [-t <timeout>] [-r <remote version>] [-p <port>] <host>\n", progname);
 }
 
diff --git a/plugins/check_swap.c b/plugins/check_swap.c
index cd965e31..e7ee785d 100644
--- a/plugins/check_swap.c
+++ b/plugins/check_swap.c
@@ -4,7 +4,7 @@
 *
 * License: GPL
 * Copyright (c) 2000 Karl DeBisschop (kdebisschop@users.sourceforge.net)
-* Copyright (c) 2000-2007 Monitoring Plugins Development Team
+* Copyright (c) 2000-2024 Monitoring Plugins Development Team
 *
 * Description:
 *
@@ -28,7 +28,7 @@
 *****************************************************************************/
 
 const char *progname = "check_swap";
-const char *copyright = "2000-2007";
+const char *copyright = "2000-2024";
 const char *email = "devel@monitoring-plugins.org";
 
 #include "common.h"
@@ -52,9 +52,9 @@ const char *email = "devel@monitoring-plugins.org";
 #endif
 
 typedef struct {
-        int is_percentage;
+        bool is_percentage;
         uint64_t value;
-} threshold_t;
+} threshold;
 
 int check_swap (float free_swap_mb, float total_swap_mb);
 int process_arguments (int argc, char **argv);
@@ -62,10 +62,10 @@ int validate_arguments (void);
 void print_usage (void);
 void print_help (void);
 
-threshold_t warn;
-threshold_t crit;
+threshold warn;
+threshold crit;
 int verbose;
-int allswaps;
+bool allswaps = false;
 int no_swap_state = STATE_CRITICAL;
 
 int
@@ -383,10 +383,10 @@ main (int argc, char **argv)
         if (crit.is_percentage) crit_print = crit.value * (total_swap_mb *1024 *1024/100);
 
         puts (perfdata_uint64 ("swap", free_swap_mb *1024 *1024, "B",
-                        TRUE, warn_print,
-                        TRUE, crit_print,
-                        TRUE, 0,
-                        TRUE, (long) total_swap_mb * 1024 * 1024));
+                        true, warn_print,
+                        true, crit_print,
+                        true, 0,
+                        true, (long) total_swap_mb * 1024 * 1024));
 
         return result;
 }
@@ -399,28 +399,30 @@ check_swap(float free_swap_mb, float total_swap_mb)
         if (!total_swap_mb) return no_swap_state;
 
         uint64_t free_swap = free_swap_mb * (1024 * 1024);              /* Convert back to bytes as warn and crit specified in bytes */
-
-        if (!crit.is_percentage && crit.value >= free_swap) return STATE_CRITICAL;
-        if (!warn.is_percentage && warn.value >= free_swap) return STATE_WARNING;
-
-
         uint64_t usage_percentage = ((total_swap_mb - free_swap_mb) / total_swap_mb) * 100;
 
-        if (crit.is_percentage &&
-                        crit.value != 0 &&
-                        usage_percentage >= (100 - crit.value))
-        {
-                        return STATE_CRITICAL;
-        }
-
-        if (warn.is_percentage &&
-                        warn.value != 0 &&
-                        usage_percentage >= (100 - warn.value))
-        {
-                        return STATE_WARNING;
-        }
-
-        return STATE_OK;
+        if (warn.value || crit.value) {                                 /* Thresholds defined */
+                if (!crit.is_percentage && crit.value >= free_swap) return STATE_CRITICAL;
+                if (!warn.is_percentage && warn.value >= free_swap) return STATE_WARNING;
+
+                if (crit.is_percentage &&
+                                crit.value != 0 &&
+                                usage_percentage >= (100 - crit.value))
+                {
+                                return STATE_CRITICAL;
+                }
+
+                if (warn.is_percentage &&
+                                warn.value != 0 &&
+                                usage_percentage >= (100 - warn.value))
+                {
+                                return STATE_WARNING;
+                }
+
+                return STATE_OK;
+        } else {                                                        /* Without thresholds */
+                return STATE_OK;
+        }
 }
 
 
@@ -443,9 +445,6 @@ process_arguments (int argc, char **argv)
                 {0, 0, 0, 0}
         };
 
-        if (argc < 2)
-                return ERROR;
-
         while (1) {
                 c = getopt_long (argc, argv, "+?Vvhac:w:n:", longopts, &option);
 
@@ -465,7 +464,7 @@ process_arguments (int argc, char **argv)
 
                                 if (optarg[length - 1] == '%') {
                                         /* It's percentage */
-                                        warn.is_percentage = 1;
+                                        warn.is_percentage = true;
                                         optarg[length - 1] = '\0';
                                         if (is_uint64(optarg, &warn.value)) {
                                                 if (warn.value > 100) {
@@ -475,7 +474,7 @@ process_arguments (int argc, char **argv)
                                         break;
                                 } else {
                                         /* It's Bytes */
-                                        warn.is_percentage = 0;
+                                        warn.is_percentage = false;
                                         if (is_uint64(optarg, &warn.value)) {
                                                 break;
                                         } else {
@@ -495,7 +494,7 @@ process_arguments (int argc, char **argv)
 
                                 if (optarg[length - 1] == '%') {
                                         /* It's percentage */
-                                        crit.is_percentage = 1;
+                                        crit.is_percentage = true;
                                         optarg[length - 1] = '\0';
                                         if (is_uint64(optarg, &crit.value)) {
                                                 if (crit.value> 100) {
@@ -505,7 +504,7 @@ process_arguments (int argc, char **argv)
                                         break;
                                 } else {
                                         /* It's Bytes */
-                                        crit.is_percentage = 0;
+                                        crit.is_percentage = false;
                                         if (is_uint64(optarg, &crit.value)) {
                                                 break;
                                         } else {
@@ -514,7 +513,7 @@ process_arguments (int argc, char **argv)
                                 }
                           }
                 case 'a':                                                                       /* all swap */
-                        allswaps = TRUE;
+                        allswaps = true;
                         break;
                 case 'n':
                         if ((no_swap_state = mp_translate_state(optarg)) == ERROR) {
@@ -547,10 +546,7 @@ process_arguments (int argc, char **argv)
 int
 validate_arguments (void)
 {
-        if (warn.value == 0 && crit.value == 0) {
-                return ERROR;
-        }
-        else if ((warn.is_percentage == crit.is_percentage) && (warn.value < crit.value)) {
+        if ((warn.is_percentage == crit.is_percentage) && (warn.value < crit.value)) {
                 /* This is NOT triggered if warn and crit are different units, e.g warn is percentage
                  * and crit is absolute. We cannot determine the condition at this point since we
                  * dont know the value of total swap yet
@@ -595,6 +591,7 @@ print_help (void)
         printf ("\n");
         printf ("%s\n", _("Notes:"));
         printf (" %s\n", _("Both INTEGER and PERCENT thresholds can be specified, they are all checked."));
+        printf (" %s\n", _("Without thresholds, the plugin shows free swap space and performance data, but always returns OK."));
         printf (" %s\n", _("On AIX, if -a is specified, uses lsps -a, otherwise uses lsps -s."));
 
         printf (UT_SUPPORT);
@@ -605,6 +602,6 @@ void
 print_usage (void)
 {
         printf ("%s\n", _("Usage:"));
-        printf (" %s [-av] -w <percent_free>%% -c <percent_free>%%\n",progname);
-        printf ("  -w <bytes_free> -c <bytes_free> [-n <state>]\n");
+        printf (" %s [-av] [-w <percent_free>%%] [-c <percent_free>%%]\n",progname);
+        printf ("  [-w <bytes_free>] [-c <bytes_free>] [-n <state>]\n");
 }
diff --git a/plugins/check_tcp.c b/plugins/check_tcp.c
index 1d307cf3..01dd35eb 100644
--- a/plugins/check_tcp.c
+++ b/plugins/check_tcp.c
@@ -41,7 +41,7 @@ const char *email = "devel@monitoring-plugins.org";
 #include <sys/select.h>
 
 #ifdef HAVE_SSL
-static int check_cert = FALSE;
+static bool check_cert = false;
 static int days_till_exp_warn, days_till_exp_crit;
 # define my_recv(buf, len) ((flags & FLAG_SSL) ? np_net_ssl_read(buf, len) : read(sd, buf, len))
 # define my_send(buf, len) ((flags & FLAG_SSL) ? np_net_ssl_write(buf, len) : send(sd, buf, len, 0))
@@ -65,12 +65,12 @@ static int READ_TIMEOUT = 2;
 
 static int server_port = 0;
 static char *server_address = NULL;
-static int host_specified = FALSE;
+static bool host_specified = false;
 static char *server_send = NULL;
 static char *server_quit = NULL;
 static char **server_expect;
 static size_t server_expect_count = 0;
-static size_t maxbytes = 0;
+static ssize_t maxbytes = 0;
 static char **warn_codes = NULL;
 static size_t warn_codes_count = 0;
 static char **crit_codes = NULL;
@@ -88,7 +88,7 @@ static int match_flags = NP_MATCH_EXACT;
 
 #ifdef HAVE_SSL
 static char *sni = NULL;
-static int sni_specified = FALSE;
+static bool sni_specified = false;
 #endif
 
 #define FLAG_SSL 0x01
@@ -102,11 +102,9 @@ int
 main (int argc, char **argv)
 {
         int result = STATE_UNKNOWN;
-        int i;
         char *status = NULL;
         struct timeval tv;
         struct timeval timeout;
-        size_t len;
         int match = -1;
         fd_set rfds;
 
@@ -121,10 +119,10 @@ main (int argc, char **argv)
         if(progname != NULL) progname++;
         else progname = argv[0];
 
-        len = strlen(progname);
-        if(len > 6 && !memcmp(progname, "check_", 6)) {
+        size_t prog_name_len = strlen(progname);
+        if(prog_name_len > 6 && !memcmp(progname, "check_", 6)) {
                 SERVICE = strdup(progname + 6);
-                for(i = 0; i < len - 6; i++)
+                for(size_t i = 0; i < prog_name_len - 6; i++)
                         SERVICE[i] = toupper(SERVICE[i]);
         }
 
@@ -247,7 +245,7 @@ main (int argc, char **argv)
 #ifdef HAVE_SSL
         if (flags & FLAG_SSL){
                 result = np_net_ssl_init_with_hostname(sd, (sni_specified ? sni : NULL));
-                if (result == STATE_OK && check_cert == TRUE) {
+                if (result == STATE_OK && check_cert) {
                         result = np_net_ssl_check_cert(days_till_exp_warn, days_till_exp_crit);
                 }
         }
@@ -275,19 +273,21 @@ main (int argc, char **argv)
                         printf("Quit string: %s\n", server_quit);
                 }
                 printf("server_expect_count: %d\n", (int)server_expect_count);
-                for(i = 0; i < server_expect_count; i++)
-                        printf("\t%d: %s\n", i, server_expect[i]);
+                for(size_t i = 0; i < server_expect_count; i++)
+                        printf("\t%zd: %s\n", i, server_expect[i]);
         }
 
         /* if(len) later on, we know we have a non-NULL response */
-        len = 0;
+        ssize_t len = 0;
+
         if (server_expect_count) {
+                ssize_t received = 0;
 
                 /* watch for the expect string */
-                while ((i = my_recv(buffer, sizeof(buffer))) > 0) {
-                        status = realloc(status, len + i + 1);
-                        memcpy(&status[len], buffer, i);
-                        len += i;
+                while ((received = my_recv(buffer, sizeof(buffer))) > 0) {
+                        status = realloc(status, len + received + 1);
+                        memcpy(&status[len], buffer, received);
+                        len += received;
                         status[len] = '\0';
 
                         /* stop reading if user-forced */
@@ -307,6 +307,7 @@ main (int argc, char **argv)
                         if(select(sd + 1, &rfds, NULL, NULL, &timeout) <= 0)
                                 break;
                 }
+
                 if (match == NP_MATCH_RETRY)
                         match = NP_MATCH_FAILURE;
 
@@ -378,18 +379,18 @@ main (int argc, char **argv)
         if(match == NP_MATCH_FAILURE)
                 printf ("|%s",
                                 fperfdata ("time", elapsed_time, "s",
-                                (flags & FLAG_TIME_WARN ? TRUE : FALSE), 0,
-                                (flags & FLAG_TIME_CRIT ? TRUE : FALSE), 0,
-                                TRUE, 0,
-                                TRUE, socket_timeout)
+                                (flags & FLAG_TIME_WARN ? true : false), 0,
+                                (flags & FLAG_TIME_CRIT ? true : false), 0,
+                                true, 0,
+                                true, socket_timeout)
                         );
         else
                 printf("|%s",
                                 fperfdata ("time", elapsed_time, "s",
-                                (flags & FLAG_TIME_WARN ? TRUE : FALSE), warning_time,
-                                (flags & FLAG_TIME_CRIT ? TRUE : FALSE), critical_time,
-                                TRUE, 0,
-                                TRUE, socket_timeout)
+                                (flags & FLAG_TIME_WARN ? true : false), warning_time,
+                                (flags & FLAG_TIME_CRIT ? true : false), critical_time,
+                                true, 0,
+                                true, socket_timeout)
                         );
 
         putchar('\n');
@@ -399,11 +400,9 @@ main (int argc, char **argv)
 
 
 /* process command-line arguments */
-static int
-process_arguments (int argc, char **argv)
-{
+static int process_arguments (int argc, char **argv) {
         int c;
-        int escape = 0;
+        bool escape = false;
         char *temp;
 
         enum {
@@ -492,7 +491,7 @@ process_arguments (int argc, char **argv)
 #endif
                         break;
                 case 'H':                 /* hostname */
-                        host_specified = TRUE;
+                        host_specified = true;
                         server_address = optarg;
                         break;
                 case 'c':                 /* critical */
@@ -527,7 +526,7 @@ process_arguments (int argc, char **argv)
                                 server_port = atoi (optarg);
                         break;
                 case 'E':
-                        escape = 1;
+                        escape = true;
                         break;
                 case 's':
                         if (escape)
@@ -601,7 +600,7 @@ process_arguments (int argc, char **argv)
                                 usage2 (_("Invalid certificate expiration period"), optarg);
                             days_till_exp_warn = atoi (optarg);
                         }
-                        check_cert = TRUE;
+                        check_cert = true;
                         flags |= FLAG_SSL;
                         break;
 #  endif /* USE_OPENSSL */
@@ -617,7 +616,7 @@ process_arguments (int argc, char **argv)
                 case SNI_OPTION:
 #ifdef HAVE_SSL
                         flags |= FLAG_SSL;
-                        sni_specified = TRUE;
+                        sni_specified = true;
                         sni = optarg;
 #else
                         die (STATE_UNKNOWN, _("Invalid option - SSL is not available"));
@@ -630,15 +629,15 @@ process_arguments (int argc, char **argv)
         }
 
         c = optind;
-        if(host_specified == FALSE && c < argc)
+        if(!host_specified && c < argc)
                 server_address = strdup (argv[c++]);
 
         if (server_address == NULL)
                 usage4 (_("You must provide a server address"));
-        else if (server_address[0] != '/' && is_host (server_address) == FALSE)
+        else if (server_address[0] != '/' && !is_host(server_address))
                 die (STATE_CRITICAL, "%s %s - %s: %s\n", SERVICE, state_text(STATE_CRITICAL), _("Invalid hostname, address or socket"), server_address);
 
-        return TRUE;
+        return OK;
 }
 
 
diff --git a/plugins/check_time.c b/plugins/check_time.c
index baf8c591..f50ea427 100644
--- a/plugins/check_time.c
+++ b/plugins/check_time.c
@@ -45,16 +45,16 @@ enum {
 uint32_t raw_server_time;
 unsigned long server_time, diff_time;
 int warning_time = 0;
-int check_warning_time = FALSE;
+bool check_warning_time = false;
 int critical_time = 0;
-int check_critical_time = FALSE;
+bool check_critical_time = false;
 unsigned long warning_diff = 0;
-int check_warning_diff = FALSE;
+bool check_warning_diff = false;
 unsigned long critical_diff = 0;
-int check_critical_diff = FALSE;
+bool check_critical_diff = false;
 int server_port = TIME_PORT;
 char *server_address = NULL;
-int use_udp = FALSE;
+bool use_udp = false;
 
 int process_arguments (int, char **);
 void print_help (void);
@@ -92,9 +92,9 @@ main (int argc, char **argv)
         }
 
         if (result != STATE_OK) {
-                if (check_critical_time == TRUE)
+                if (check_critical_time)
                         result = STATE_CRITICAL;
-                else if (check_warning_time == TRUE)
+                else if (check_warning_time)
                         result = STATE_WARNING;
                 else
                         result = STATE_UNKNOWN;
@@ -105,9 +105,9 @@ main (int argc, char **argv)
 
         if (use_udp) {
                 if (send (sd, "", 0, 0) < 0) {
-                        if (check_critical_time == TRUE)
+                        if (check_critical_time)
                                 result = STATE_CRITICAL;
-                        else if (check_warning_time == TRUE)
+                        else if (check_warning_time)
                                 result = STATE_WARNING;
                         else
                                 result = STATE_UNKNOWN;
@@ -129,9 +129,9 @@ main (int argc, char **argv)
 
         /* return a WARNING status if we couldn't read any data */
         if (result <= 0) {
-                if (check_critical_time == TRUE)
+                if (check_critical_time)
                         result = STATE_CRITICAL;
-                else if (check_warning_time == TRUE)
+                else if (check_warning_time)
                         result = STATE_WARNING;
                 else
                         result = STATE_UNKNOWN;
@@ -143,9 +143,9 @@ main (int argc, char **argv)
         result = STATE_OK;
 
         conntime = (end_time - start_time);
-        if (check_critical_time == TRUE && conntime > critical_time)
+        if (check_critical_time&& conntime > critical_time)
                 result = STATE_CRITICAL;
-        else if (check_warning_time == TRUE && conntime > warning_time)
+        else if (check_warning_time && conntime > warning_time)
                 result = STATE_WARNING;
 
         if (result != STATE_OK)
@@ -154,7 +154,7 @@ main (int argc, char **argv)
                      perfdata ("time", (long)conntime, "s",
                                check_warning_time, (long)warning_time,
                                check_critical_time, (long)critical_time,
-                               TRUE, 0, FALSE, 0));
+                               true, 0, false, 0));
 
         server_time = ntohl (raw_server_time) - UNIX_EPOCH;
         if (server_time > (unsigned long)end_time)
@@ -162,9 +162,9 @@ main (int argc, char **argv)
         else
                 diff_time = (unsigned long)end_time - server_time;
 
-        if (check_critical_diff == TRUE && diff_time > critical_diff)
+        if (check_critical_diff&& diff_time > critical_diff)
                 result = STATE_CRITICAL;
-        else if (check_warning_diff == TRUE && diff_time > warning_diff)
+        else if (check_warning_diff&& diff_time > warning_diff)
                 result = STATE_WARNING;
 
         printf (_("TIME %s - %lu second time difference|%s %s\n"),
@@ -172,11 +172,11 @@ main (int argc, char **argv)
                 perfdata ("time", (long)conntime, "s",
                           check_warning_time, (long)warning_time,
                           check_critical_time, (long)critical_time,
-                          TRUE, 0, FALSE, 0),
+                          true, 0, false, 0),
                 perfdata ("offset", diff_time, "s",
                           check_warning_diff, warning_diff,
                           check_critical_diff, critical_diff,
-                          TRUE, 0, FALSE, 0));
+                          true, 0, false, 0));
         return result;
 }
 
@@ -219,7 +219,7 @@ process_arguments (int argc, char **argv)
                         strcpy (argv[c], "-C");
         }
 
-        while (1) {
+        while (true) {
                 c = getopt_long (argc, argv, "hVH:w:c:W:C:p:t:u", longopts,
                                                                          &option);
 
@@ -236,19 +236,19 @@ process_arguments (int argc, char **argv)
                         print_revision (progname, NP_VERSION);
                         exit (STATE_UNKNOWN);
                 case 'H':                                                                       /* hostname */
-                        if (is_host (optarg) == FALSE)
+                        if (!is_host (optarg))
                                 usage2 (_("Invalid hostname/address"), optarg);
                         server_address = optarg;
                         break;
                 case 'w':                                                                       /* warning-variance */
                         if (is_intnonneg (optarg)) {
                                 warning_diff = strtoul (optarg, NULL, 10);
-                                check_warning_diff = TRUE;
+                                check_warning_diff = true;
                         }
                         else if (strspn (optarg, "0123456789:,") > 0) {
                                 if (sscanf (optarg, "%lu%*[:,]%d", &warning_diff, &warning_time) == 2) {
-                                        check_warning_diff = TRUE;
-                                        check_warning_time = TRUE;
+                                        check_warning_diff = true;
+                                        check_warning_time = true;
                                 }
                                 else {
                                         usage4 (_("Warning thresholds must be a positive integer"));
@@ -261,13 +261,13 @@ process_arguments (int argc, char **argv)
                 case 'c':                                                                       /* critical-variance */
                         if (is_intnonneg (optarg)) {
                                 critical_diff = strtoul (optarg, NULL, 10);
-                                check_critical_diff = TRUE;
+                                check_critical_diff = true;
                         }
                         else if (strspn (optarg, "0123456789:,") > 0) {
                                 if (sscanf (optarg, "%lu%*[:,]%d", &critical_diff, &critical_time) ==
                                                 2) {
-                                        check_critical_diff = TRUE;
-                                        check_critical_time = TRUE;
+                                        check_critical_diff = true;
+                                        check_critical_time = true;
                                 }
                                 else {
                                         usage4 (_("Critical thresholds must be a positive integer"));
@@ -282,14 +282,14 @@ process_arguments (int argc, char **argv)
                                 usage4 (_("Warning threshold must be a positive integer"));
                         else
                                 warning_time = atoi (optarg);
-                        check_warning_time = TRUE;
+                        check_warning_time = true;
                         break;
                 case 'C':                                                                       /* critical-connect */
                         if (!is_intnonneg (optarg))
                                 usage4 (_("Critical threshold must be a positive integer"));
                         else
                                 critical_time = atoi (optarg);
-                        check_critical_time = TRUE;
+                        check_critical_time = true;
                         break;
                 case 'p':                                                                       /* port */
                         if (!is_intnonneg (optarg))
@@ -304,14 +304,14 @@ process_arguments (int argc, char **argv)
                                 socket_timeout = atoi (optarg);
                         break;
                 case 'u':                                                                       /* udp */
-                        use_udp = TRUE;
+                        use_udp = true;
                 }
         }
 
         c = optind;
         if (server_address == NULL) {
                 if (argc > c) {
-                        if (is_host (argv[c]) == FALSE)
+                        if (!is_host (argv[c]))
                                 usage2 (_("Invalid hostname/address"), optarg);
                         server_address = argv[c];
                 }
diff --git a/plugins/check_ups.c b/plugins/check_ups.c
index 68737c4b..380ff3bc 100644
--- a/plugins/check_ups.c
+++ b/plugins/check_ups.c
@@ -1,665 +1,746 @@
 /*****************************************************************************
-* 
-* Monitoring check_ups plugin
-* 
-* License: GPL
-* Copyright (c) 2000 Tom Shields
-*               2004 Alain Richard <alain.richard@equation.fr>
-*               2004 Arnaud Quette <arnaud.quette@mgeups.com>
-* Copyright (c) 2002-2007 Monitoring Plugins Development Team
-* 
-* Description:
-* 
-* This file contains Network UPS Tools plugin for Monitoring
-* 
-* This plugin tests the UPS service on the specified host. Network UPS Tools
-* from www.networkupstools.org must be running for this plugin to work.
-* 
-* 
-* This program is free software: you can redistribute it and/or modify
-* it under the terms of the GNU General Public License as published by
-* the Free Software Foundation, either version 3 of the License, or
-* (at your option) any later version.
-* 
-* This program is distributed in the hope that it will be useful,
-* but WITHOUT ANY WARRANTY; without even the implied warranty of
-* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-* GNU General Public License for more details.
-* 
-* You should have received a copy of the GNU General Public License
-* along with this program.  If not, see <http://www.gnu.org/licenses/>.
-* 
-* 
-*****************************************************************************/
+ *
+ * Monitoring check_ups plugin
+ *
+ * License: GPL
+ * Copyright (c) 2000 Tom Shields
+ *               2004 Alain Richard <alain.richard@equation.fr>
+ *               2004 Arnaud Quette <arnaud.quette@mgeups.com>
+ * Copyright (c) 2002-2023 Monitoring Plugins Development Team
+ *
+ * Description:
+ *
+ * This file contains Network UPS Tools plugin for Monitoring
+ *
+ * This plugin tests the UPS service on the specified host. Network UPS Tools
+ * from www.networkupstools.org must be running for this plugin to work.
+ *
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ *
+ *****************************************************************************/
 
 const char *progname = "check_ups";
-const char *copyright = "2000-2007";
+const char *copyright = "2000-2023";
 const char *email = "devel@monitoring-plugins.org";
 
 #include "common.h"
 #include "netutils.h"
 #include "utils.h"
 
-enum {
-        PORT = 3493
-};
-
-#define CHECK_NONE       0
-
-#define UPS_NONE     0   /* no supported options */
-#define UPS_UTILITY  1   /* supports utility line voltage */
-#define UPS_BATTPCT  2   /* supports percent battery remaining */
-#define UPS_STATUS   4   /* supports UPS status */
-#define UPS_TEMP     8   /* supports UPS temperature */
-#define UPS_LOADPCT     16   /* supports load percent */
-
-#define UPSSTATUS_NONE       0
-#define UPSSTATUS_OFF        1
-#define UPSSTATUS_OL         2
-#define UPSSTATUS_OB         4
-#define UPSSTATUS_LB         8
-#define UPSSTATUS_CAL       16
-#define UPSSTATUS_RB        32  /*Replace Battery */
-#define UPSSTATUS_BYPASS    64
-#define UPSSTATUS_OVER     128
-#define UPSSTATUS_TRIM     256
-#define UPSSTATUS_BOOST    512
+enum { PORT = 3493 };
+
+#define UPS_NONE      0  /* no supported options */
+#define UPS_UTILITY   1  /* supports utility line    */
+#define UPS_BATTPCT   2  /* supports percent battery remaining */
+#define UPS_STATUS    4  /* supports UPS status */
+#define UPS_TEMP      8  /* supports UPS temperature */
+#define UPS_LOADPCT   16 /* supports load percent */
+#define UPS_REALPOWER 32 /* supports real power */
+
+#define UPSSTATUS_NONE    0
+#define UPSSTATUS_OFF     1
+#define UPSSTATUS_OL      2
+#define UPSSTATUS_OB      4
+#define UPSSTATUS_LB      8
+#define UPSSTATUS_CAL     16
+#define UPSSTATUS_RB      32 /*Replace Battery */
+#define UPSSTATUS_BYPASS  64
+#define UPSSTATUS_OVER    128
+#define UPSSTATUS_TRIM    256
+#define UPSSTATUS_BOOST   512
 #define UPSSTATUS_CHRG    1024
 #define UPSSTATUS_DISCHRG 2048
-#define UPSSTATUS_UNKNOWN  4096
-
-enum { NOSUCHVAR = ERROR-1 };
-
-int server_port = PORT;
-char *server_address;
-char *ups_name = NULL;
-double warning_value = 0.0;
-double critical_value = 0.0;
-int check_warn = FALSE;
-int check_crit = FALSE;
-int check_variable = UPS_NONE;
-int supported_options = UPS_NONE;
-int status = UPSSTATUS_NONE;
-
-double ups_utility_voltage = 0.0;
-double ups_battery_percent = 0.0;
-double ups_load_percent = 0.0;
-double ups_temperature = 0.0;
-char *ups_status;
-int temp_output_c = 0;
-
-int determine_status (void);
-int get_ups_variable (const char *, char *);
-
-int process_arguments (int, char **);
-int validate_arguments (void);
-void print_help (void);
-void print_usage (void);
-
-int
-main (int argc, char **argv)
-{
-        int result = STATE_UNKNOWN;
-        char *message;
+#define UPSSTATUS_UNKNOWN 4096
+#define UPSSTATUS_ALARM   8192
+
+enum { NOSUCHVAR = ERROR - 1 };
+
+typedef struct ups_config {
+        unsigned int server_port;
+        char *server_address;
+        char *ups_name;
+        double warning_value;
+        double critical_value;
+        bool check_warn;
+        bool check_crit;
+        int check_variable;
+        int status;
+        bool temp_output_c;
+} ups_config;
+
+ups_config ups_config_init(void) {
+        ups_config tmp = {0};
+        tmp.server_port = PORT;
+        tmp.server_address = NULL;
+        tmp.ups_name = NULL;
+        tmp.check_variable = UPS_NONE;
+        tmp.status = UPSSTATUS_NONE;
+
+        return tmp;
+}
+
+// Forward declarations
+int determine_status(ups_config *, int *supported_options);
+int get_ups_variable(const char *, char *, const ups_config config);
+
+int process_arguments(int, char **, ups_config *);
+int validate_arguments(ups_config);
+void print_help(void);
+void print_usage(void);
+
+int main(int argc, char **argv) {
+        setlocale(LC_ALL, "");
+        bindtextdomain(PACKAGE, LOCALEDIR);
+        textdomain(PACKAGE);
+
+        char *ups_status;
+        ups_status = strdup("N/A");
+
         char *data;
-        char *tunits;
-        char temp_buffer[MAX_INPUT_BUFFER];
-        double ups_utility_deviation = 0.0;
-        int res;
+        data = strdup("");
 
-        setlocale (LC_ALL, "");
-        bindtextdomain (PACKAGE, LOCALEDIR);
-        textdomain (PACKAGE);
+        char *message;
+        message = strdup("");
 
-        ups_status = strdup ("N/A");
-        data = strdup ("");
-        message = strdup ("");
+        // Exit result
+        int result = STATE_UNKNOWN;
 
         /* Parse extra opts if any */
-        argv=np_extra_opts (&argc, argv, progname);
+        argv = np_extra_opts(&argc, argv, progname);
 
-        if (process_arguments (argc, argv) == ERROR)
-                usage4 (_("Could not parse arguments"));
+        // Config from commandline
+        ups_config config = ups_config_init();
+
+        if (process_arguments(argc, argv, &config) == ERROR) {
+                usage4(_("Could not parse arguments"));
+        }
 
         /* initialize alarm signal handling */
-        signal (SIGALRM, socket_timeout_alarm_handler);
+        signal(SIGALRM, socket_timeout_alarm_handler);
 
         /* set socket timeout */
-        alarm (socket_timeout);
+        alarm(socket_timeout);
+
+        int supported_options = UPS_NONE;
 
         /* get the ups status if possible */
-        if (determine_status () != OK)
+        if (determine_status(&config, &supported_options) != OK) {
                 return STATE_CRITICAL;
+        }
+
+
         if (supported_options & UPS_STATUS) {
 
-                ups_status = strdup ("");
+                ups_status = strdup("");
+
                 result = STATE_OK;
 
-                if (status & UPSSTATUS_OFF) {
-                        xasprintf (&ups_status, "Off");
+                if (config.status & UPSSTATUS_OFF) {
+                        xasprintf(&ups_status, "Off");
                         result = STATE_CRITICAL;
-                }
-                else if ((status & (UPSSTATUS_OB | UPSSTATUS_LB)) ==
-                                                 (UPSSTATUS_OB | UPSSTATUS_LB)) {
-                        xasprintf (&ups_status, _("On Battery, Low Battery"));
+                } else if ((config.status & (UPSSTATUS_OB | UPSSTATUS_LB)) ==
+                                   (UPSSTATUS_OB | UPSSTATUS_LB)) {
+                        xasprintf(&ups_status, _("On Battery, Low Battery"));
                         result = STATE_CRITICAL;
-                }
-                else {
-                        if (status & UPSSTATUS_OL) {
-                                xasprintf (&ups_status, "%s%s", ups_status, _("Online"));
+                } else {
+                        if (config.status & UPSSTATUS_OL) {
+                                xasprintf(&ups_status, "%s%s", ups_status, _("Online"));
                         }
-                        if (status & UPSSTATUS_OB) {
-                                xasprintf (&ups_status, "%s%s", ups_status, _("On Battery"));
-                                result = STATE_WARNING;
+                        if (config.status & UPSSTATUS_OB) {
+                                xasprintf(&ups_status, "%s%s", ups_status, _("On Battery"));
+                                result = max_state(result, STATE_WARNING);
                         }
-                        if (status & UPSSTATUS_LB) {
-                                xasprintf (&ups_status, "%s%s", ups_status, _(", Low Battery"));
-                                result = STATE_WARNING;
+                        if (config.status & UPSSTATUS_LB) {
+                                xasprintf(&ups_status, "%s%s", ups_status, _(", Low Battery"));
+                                result = max_state(result, STATE_WARNING);
                         }
-                        if (status & UPSSTATUS_CAL) {
-                                xasprintf (&ups_status, "%s%s", ups_status, _(", Calibrating"));
+                        if (config.status & UPSSTATUS_CAL) {
+                                xasprintf(&ups_status, "%s%s", ups_status, _(", Calibrating"));
                         }
-                        if (status & UPSSTATUS_RB) {
-                                xasprintf (&ups_status, "%s%s", ups_status, _(", Replace Battery"));
-                                result = STATE_WARNING;
+                        if (config.status & UPSSTATUS_RB) {
+                                xasprintf(&ups_status, "%s%s", ups_status,
+                                                  _(", Replace Battery"));
+                                result = max_state(result, STATE_WARNING);
                         }
-                        if (status & UPSSTATUS_BYPASS) {
-                                xasprintf (&ups_status, "%s%s", ups_status, _(", On Bypass"));
+                        if (config.status & UPSSTATUS_BYPASS) {
+                                xasprintf(&ups_status, "%s%s", ups_status, _(", On Bypass"));
+                                // Bypassing the battery is likely a bad thing
+                                result = STATE_CRITICAL;
+                        }
+                        if (config.status & UPSSTATUS_OVER) {
+                                xasprintf(&ups_status, "%s%s", ups_status, _(", Overload"));
+                                result = max_state(result, STATE_WARNING);
                         }
-                        if (status & UPSSTATUS_OVER) {
-                                xasprintf (&ups_status, "%s%s", ups_status, _(", Overload"));
+                        if (config.status & UPSSTATUS_TRIM) {
+                                xasprintf(&ups_status, "%s%s", ups_status, _(", Trimming"));
                         }
-                        if (status & UPSSTATUS_TRIM) {
-                                xasprintf (&ups_status, "%s%s", ups_status, _(", Trimming"));
+                        if (config.status & UPSSTATUS_BOOST) {
+                                xasprintf(&ups_status, "%s%s", ups_status, _(", Boosting"));
                         }
-                        if (status & UPSSTATUS_BOOST) {
-                                xasprintf (&ups_status, "%s%s", ups_status, _(", Boosting"));
+                        if (config.status & UPSSTATUS_CHRG) {
+                                xasprintf(&ups_status, "%s%s", ups_status, _(", Charging"));
                         }
-                        if (status & UPSSTATUS_CHRG) {
-                                xasprintf (&ups_status, "%s%s", ups_status, _(", Charging"));
+                        if (config.status & UPSSTATUS_DISCHRG) {
+                                xasprintf(&ups_status, "%s%s", ups_status, _(", Discharging"));
+                                result = max_state(result, STATE_WARNING);
                         }
-                        if (status & UPSSTATUS_DISCHRG) {
-                                xasprintf (&ups_status, "%s%s", ups_status, _(", Discharging"));
+                        if (config.status & UPSSTATUS_ALARM) {
+                                xasprintf(&ups_status, "%s%s", ups_status, _(", ALARM"));
+                                result = STATE_CRITICAL;
                         }
-                        if (status & UPSSTATUS_UNKNOWN) {
-                                xasprintf (&ups_status, "%s%s", ups_status, _(", Unknown"));
+                        if (config.status & UPSSTATUS_UNKNOWN) {
+                                xasprintf(&ups_status, "%s%s", ups_status, _(", Unknown"));
                         }
                 }
-                xasprintf (&message, "%sStatus=%s ", message, ups_status);
+                xasprintf(&message, "%sStatus=%s ", message, ups_status);
         }
 
+        int res;
+        char temp_buffer[MAX_INPUT_BUFFER];
+
         /* get the ups utility voltage if possible */
-        res=get_ups_variable ("input.voltage", temp_buffer);
-        if (res == NOSUCHVAR) supported_options &= ~UPS_UTILITY;
-        else if (res != OK)
+        res = get_ups_variable("input.voltage", temp_buffer, config);
+        if (res == NOSUCHVAR) {
+                supported_options &= ~UPS_UTILITY;
+        } else if (res != OK) {
                 return STATE_CRITICAL;
-        else {
+        } else {
                 supported_options |= UPS_UTILITY;
 
-                ups_utility_voltage = atof (temp_buffer);
-                xasprintf (&message, "%sUtility=%3.1fV ", message, ups_utility_voltage);
+                double ups_utility_voltage = 0.0;
+                ups_utility_voltage = atof(temp_buffer);
+                xasprintf(&message, "%sUtility=%3.1fV ", message, ups_utility_voltage);
+
+                double ups_utility_deviation = 0.0;
 
-                if (ups_utility_voltage > 120.0)
+                if (ups_utility_voltage > 120.0) {
                         ups_utility_deviation = 120.0 - ups_utility_voltage;
-                else
+                } else {
                         ups_utility_deviation = ups_utility_voltage - 120.0;
+                }
 
-                if (check_variable == UPS_UTILITY) {
-                        if (check_crit==TRUE && ups_utility_deviation>=critical_value) {
+                if (config.check_variable == UPS_UTILITY) {
+                        if (config.check_crit &&
+                                ups_utility_deviation >= config.critical_value) {
                                 result = STATE_CRITICAL;
+                        } else if (config.check_warn &&
+                                           ups_utility_deviation >= config.warning_value) {
+                                result = max_state(result, STATE_WARNING);
                         }
-                        else if (check_warn==TRUE && ups_utility_deviation>=warning_value) {
-                                result = max_state (result, STATE_WARNING);
-                        }
-                        xasprintf (&data, "%s",
-                                  perfdata ("voltage", (long)(1000*ups_utility_voltage), "mV",
-                                            check_warn, (long)(1000*warning_value),
-                                            check_crit, (long)(1000*critical_value),
-                                            TRUE, 0, FALSE, 0));
+                        xasprintf(&data, "%s",
+                                          perfdata("voltage", (long)(1000 * ups_utility_voltage),
+                                                           "mV", config.check_warn,
+                                                           (long)(1000 * config.warning_value),
+                                                           config.check_crit,
+                                                           (long)(1000 * config.critical_value), true, 0,
+                                                           false, 0));
                 } else {
-                        xasprintf (&data, "%s",
-                                  perfdata ("voltage", (long)(1000*ups_utility_voltage), "mV",
-                                            FALSE, 0, FALSE, 0, TRUE, 0, FALSE, 0));
+                        xasprintf(&data, "%s",
+                                          perfdata("voltage", (long)(1000 * ups_utility_voltage),
+                                                           "mV", false, 0, false, 0, true, 0, false, 0));
                 }
         }
 
         /* get the ups battery percent if possible */
-        res=get_ups_variable ("battery.charge", temp_buffer);
-        if (res == NOSUCHVAR) supported_options &= ~UPS_BATTPCT;
-        else if ( res != OK)
+        res = get_ups_variable("battery.charge", temp_buffer, config);
+        if (res == NOSUCHVAR) {
+                supported_options &= ~UPS_BATTPCT;
+        } else if (res != OK) {
                 return STATE_CRITICAL;
-        else {
+        } else {
                 supported_options |= UPS_BATTPCT;
-                ups_battery_percent = atof (temp_buffer);
-                xasprintf (&message, "%sBatt=%3.1f%% ", message, ups_battery_percent);
 
-                if (check_variable == UPS_BATTPCT) {
-                        if (check_crit==TRUE && ups_battery_percent <= critical_value) {
+                double ups_battery_percent = 0.0;
+                ups_battery_percent = atof(temp_buffer);
+                xasprintf(&message, "%sBatt=%3.1f%% ", message, ups_battery_percent);
+
+                if (config.check_variable == UPS_BATTPCT) {
+                        if (config.check_crit &&
+                                ups_battery_percent <= config.critical_value) {
                                 result = STATE_CRITICAL;
+                        } else if (config.check_warn &&
+                                           ups_battery_percent <= config.warning_value) {
+                                result = max_state(result, STATE_WARNING);
                         }
-                        else if (check_warn==TRUE && ups_battery_percent<=warning_value) {
-                                result = max_state (result, STATE_WARNING);
-                        }
-                        xasprintf (&data, "%s %s", data,
-                                  perfdata ("battery", (long)ups_battery_percent, "%",
-                                            check_warn, (long)(warning_value),
-                                            check_crit, (long)(critical_value),
-                                            TRUE, 0, TRUE, 100));
+                        xasprintf(&data, "%s %s", data,
+                                          perfdata("battery", (long)ups_battery_percent, "%",
+                                                           config.check_warn, (long)(config.warning_value),
+                                                           config.check_crit, (long)(config.critical_value),
+                                                           true, 0, true, 100));
                 } else {
-                        xasprintf (&data, "%s %s", data,
-                                  perfdata ("battery", (long)ups_battery_percent, "%",
-                                            FALSE, 0, FALSE, 0, TRUE, 0, TRUE, 100));
+                        xasprintf(&data, "%s %s", data,
+                                          perfdata("battery", (long)ups_battery_percent, "%", false,
+                                                           0, false, 0, true, 0, true, 100));
                 }
         }
 
         /* get the ups load percent if possible */
-        res=get_ups_variable ("ups.load", temp_buffer);
-        if ( res == NOSUCHVAR ) supported_options &= ~UPS_LOADPCT;
-        else if ( res != OK)
+        res = get_ups_variable("ups.load", temp_buffer, config);
+        if (res == NOSUCHVAR) {
+                supported_options &= ~UPS_LOADPCT;
+        } else if (res != OK) {
                 return STATE_CRITICAL;
-        else {
+        } else {
                 supported_options |= UPS_LOADPCT;
-                ups_load_percent = atof (temp_buffer);
-                xasprintf (&message, "%sLoad=%3.1f%% ", message, ups_load_percent);
 
-                if (check_variable == UPS_LOADPCT) {
-                        if (check_crit==TRUE && ups_load_percent>=critical_value) {
+                double ups_load_percent = 0.0;
+                ups_load_percent = atof(temp_buffer);
+                xasprintf(&message, "%sLoad=%3.1f%% ", message, ups_load_percent);
+
+                if (config.check_variable == UPS_LOADPCT) {
+                        if (config.check_crit &&
+                                ups_load_percent >= config.critical_value) {
                                 result = STATE_CRITICAL;
+                        } else if (config.check_warn &&
+                                           ups_load_percent >= config.warning_value) {
+                                result = max_state(result, STATE_WARNING);
                         }
-                        else if (check_warn==TRUE && ups_load_percent>=warning_value) {
-                                result = max_state (result, STATE_WARNING);
-                        }
-                        xasprintf (&data, "%s %s", data,
-                                  perfdata ("load", (long)ups_load_percent, "%",
-                                            check_warn, (long)(warning_value),
-                                            check_crit, (long)(critical_value),
-                                            TRUE, 0, TRUE, 100));
+                        xasprintf(&data, "%s %s", data,
+                                          perfdata("load", (long)ups_load_percent, "%",
+                                                           config.check_warn, (long)(config.warning_value),
+                                                           config.check_crit, (long)(config.critical_value),
+                                                           true, 0, true, 100));
                 } else {
-                        xasprintf (&data, "%s %s", data,
-                                  perfdata ("load", (long)ups_load_percent, "%",
-                                            FALSE, 0, FALSE, 0, TRUE, 0, TRUE, 100));
+                        xasprintf(&data, "%s %s", data,
+                                          perfdata("load", (long)ups_load_percent, "%", false, 0,
+                                                           false, 0, true, 0, true, 100));
                 }
         }
 
         /* get the ups temperature if possible */
-        res=get_ups_variable ("ups.temperature", temp_buffer);
-        if ( res == NOSUCHVAR ) supported_options &= ~UPS_TEMP;
-        else if ( res != OK)
+        res = get_ups_variable("ups.temperature", temp_buffer, config);
+        if (res == NOSUCHVAR) {
+                supported_options &= ~UPS_TEMP;
+        } else if (res != OK) {
                 return STATE_CRITICAL;
-        else {
-                supported_options |= UPS_TEMP;
-                if (temp_output_c) {
-                  tunits="degC";
-                  ups_temperature = atof (temp_buffer);
-                  xasprintf (&message, "%sTemp=%3.1fC", message, ups_temperature);
-                }
-                else {
-                  tunits="degF";
-                  ups_temperature = (atof (temp_buffer) * 1.8) + 32;
-                  xasprintf (&message, "%sTemp=%3.1fF", message, ups_temperature);
+        } else {
+                supported_options |= UPS_TEMP;
+
+                double ups_temperature = 0.0;
+                char *tunits;
+
+                if (config.temp_output_c) {
+                        tunits = "degC";
+                        ups_temperature = atof(temp_buffer);
+                        xasprintf(&message, "%sTemp=%3.1fC", message, ups_temperature);
+                } else {
+                        tunits = "degF";
+                        ups_temperature = (atof(temp_buffer) * 1.8) + 32;
+                        xasprintf(&message, "%sTemp=%3.1fF", message, ups_temperature);
                 }
 
-                if (check_variable == UPS_TEMP) {
-                        if (check_crit==TRUE && ups_temperature>=critical_value) {
+                if (config.check_variable == UPS_TEMP) {
+                        if (config.check_crit && ups_temperature >= config.critical_value) {
                                 result = STATE_CRITICAL;
+                        } else if (config.check_warn &&
+                                           ups_temperature >= config.warning_value) {
+                                result = max_state(result, STATE_WARNING);
                         }
-                        else if (check_warn == TRUE && ups_temperature>=warning_value) {
-                                result = max_state (result, STATE_WARNING);
+                        xasprintf(&data, "%s %s", data,
+                                          perfdata("temp", (long)ups_temperature, tunits,
+                                                           config.check_warn, (long)(config.warning_value),
+                                                           config.check_crit, (long)(config.critical_value),
+                                                           true, 0, false, 0));
+                } else {
+                        xasprintf(&data, "%s %s", data,
+                                          perfdata("temp", (long)ups_temperature, tunits, false, 0,
+                                                           false, 0, true, 0, false, 0));
+                }
+        }
+
+        /* get the ups real power if possible */
+        res = get_ups_variable("ups.realpower", temp_buffer, config);
+        if (res == NOSUCHVAR) {
+                supported_options &= ~UPS_REALPOWER;
+        } else if (res != OK) {
+                return STATE_CRITICAL;
+        } else {
+                supported_options |= UPS_REALPOWER;
+                double ups_realpower = 0.0;
+                ups_realpower = atof(temp_buffer);
+                xasprintf(&message, "%sReal power=%3.1fW ", message, ups_realpower);
+
+                if (config.check_variable == UPS_REALPOWER) {
+                        if (config.check_crit && ups_realpower >= config.critical_value) {
+                                result = STATE_CRITICAL;
+                        } else if (config.check_warn &&
+                                           ups_realpower >= config.warning_value) {
+                                result = max_state(result, STATE_WARNING);
                         }
-                        xasprintf (&data, "%s %s", data,
-                                  perfdata ("temp", (long)ups_temperature, tunits,
-                                            check_warn, (long)(warning_value),
-                                            check_crit, (long)(critical_value),
-                                            TRUE, 0, FALSE, 0));
+                        xasprintf(&data, "%s %s", data,
+                                          perfdata("realpower", (long)ups_realpower, "W",
+                                                           config.check_warn, (long)(config.warning_value),
+                                                           config.check_crit, (long)(config.critical_value),
+                                                           true, 0, false, 0));
                 } else {
-                        xasprintf (&data, "%s %s", data,
-                                  perfdata ("temp", (long)ups_temperature, tunits,
-                                            FALSE, 0, FALSE, 0, TRUE, 0, FALSE, 0));
+                        xasprintf(&data, "%s %s", data,
+                                          perfdata("realpower", (long)ups_realpower, "W", false, 0,
+                                                           false, 0, true, 0, false, 0));
                 }
         }
 
-        /* if the UPS does not support any options we are looking for, report an error */
+        /* if the UPS does not support any options we are looking for, report an
+         * error */
         if (supported_options == UPS_NONE) {
                 result = STATE_CRITICAL;
-                xasprintf (&message, _("UPS does not support any available options\n"));
+                xasprintf(&message, _("UPS does not support any available options\n"));
         }
 
         /* reset timeout */
-        alarm (0);
+        alarm(0);
 
-        printf ("UPS %s - %s|%s\n", state_text(result), message, data);
+        printf("UPS %s - %s|%s\n", state_text(result), message, data);
         return result;
 }
 
-
-
 /* determines what options are supported by the UPS */
-int
-determine_status (void)
-{
+int determine_status(ups_config *config, int *supported_options) {
         char recv_buffer[MAX_INPUT_BUFFER];
-        char temp_buffer[MAX_INPUT_BUFFER];
-        char *ptr;
-        int res;
 
-        res=get_ups_variable ("ups.status", recv_buffer);
-        if (res == NOSUCHVAR) return OK;
+        int res = get_ups_variable("ups.status", recv_buffer, *config);
+        if (res == NOSUCHVAR) {
+                return OK;
+        }
+
         if (res != STATE_OK) {
-                printf ("%s\n", _("Invalid response received from host"));
+                printf("%s\n", _("Invalid response received from host"));
                 return ERROR;
         }
 
-        supported_options |= UPS_STATUS;
-
-        strcpy (temp_buffer, recv_buffer);
-        for (ptr = (char *) strtok (temp_buffer, " "); ptr != NULL;
-                         ptr = (char *) strtok (NULL, " ")) {
-                if (!strcmp (ptr, "OFF"))
-                        status |= UPSSTATUS_OFF;
-                else if (!strcmp (ptr, "OL"))
-                        status |= UPSSTATUS_OL;
-                else if (!strcmp (ptr, "OB"))
-                        status |= UPSSTATUS_OB;
-                else if (!strcmp (ptr, "LB"))
-                        status |= UPSSTATUS_LB;
-                else if (!strcmp (ptr, "CAL"))
-                        status |= UPSSTATUS_CAL;
-                else if (!strcmp (ptr, "RB"))
-                        status |= UPSSTATUS_RB;
-                else if (!strcmp (ptr, "BYPASS"))
-                        status |= UPSSTATUS_BYPASS;
-                else if (!strcmp (ptr, "OVER"))
-                        status |= UPSSTATUS_OVER;
-                else if (!strcmp (ptr, "TRIM"))
-                        status |= UPSSTATUS_TRIM;
-                else if (!strcmp (ptr, "BOOST"))
-                        status |= UPSSTATUS_BOOST;
-                else if (!strcmp (ptr, "CHRG"))
-                        status |= UPSSTATUS_CHRG;
-                else if (!strcmp (ptr, "DISCHRG"))
-                        status |= UPSSTATUS_DISCHRG;
-                else
-                        status |= UPSSTATUS_UNKNOWN;
+        *supported_options |= UPS_STATUS;
+
+        char temp_buffer[MAX_INPUT_BUFFER];
+
+        strcpy(temp_buffer, recv_buffer);
+        for (char *ptr = (char *)strtok(temp_buffer, " "); ptr != NULL;
+                 ptr = (char *)strtok(NULL, " ")) {
+                if (!strcmp(ptr, "OFF")) {
+                        config->status |= UPSSTATUS_OFF;
+                } else if (!strcmp(ptr, "OL")) {
+                        config->status |= UPSSTATUS_OL;
+                } else if (!strcmp(ptr, "OB")) {
+                        config->status |= UPSSTATUS_OB;
+                } else if (!strcmp(ptr, "LB")) {
+                        config->status |= UPSSTATUS_LB;
+                } else if (!strcmp(ptr, "CAL")) {
+                        config->status |= UPSSTATUS_CAL;
+                } else if (!strcmp(ptr, "RB")) {
+                        config->status |= UPSSTATUS_RB;
+                } else if (!strcmp(ptr, "BYPASS")) {
+                        config->status |= UPSSTATUS_BYPASS;
+                } else if (!strcmp(ptr, "OVER")) {
+                        config->status |= UPSSTATUS_OVER;
+                } else if (!strcmp(ptr, "TRIM")) {
+                        config->status |= UPSSTATUS_TRIM;
+                } else if (!strcmp(ptr, "BOOST")) {
+                        config->status |= UPSSTATUS_BOOST;
+                } else if (!strcmp(ptr, "CHRG")) {
+                        config->status |= UPSSTATUS_CHRG;
+                } else if (!strcmp(ptr, "DISCHRG")) {
+                        config->status |= UPSSTATUS_DISCHRG;
+                } else if (!strcmp(ptr, "ALARM")) {
+                        config->status |= UPSSTATUS_ALARM;
+                } else {
+                        config->status |= UPSSTATUS_UNKNOWN;
+                }
         }
 
         return OK;
 }
 
-
 /* gets a variable value for a specific UPS  */
-int
-get_ups_variable (const char *varname, char *buf)
-{
-        /*  char command[MAX_INPUT_BUFFER]; */
-        char temp_buffer[MAX_INPUT_BUFFER];
+int get_ups_variable(const char *varname, char *buf, const ups_config config) {
         char send_buffer[MAX_INPUT_BUFFER];
-        char *ptr;
-        char *logout = "OK Goodbye\n";
-        int logout_len = strlen(logout);
-        int len;
-
-        *buf=0;
 
         /* create the command string to send to the UPS daemon */
         /* Add LOGOUT to avoid read failure logs */
-        if (snprintf (send_buffer, sizeof(send_buffer), "GET VAR %s %s\nLOGOUT\n", ups_name, varname) >= sizeof(send_buffer)) {
+        int res = snprintf(send_buffer, sizeof(send_buffer),
+                                           "GET VAR %s %s\nLOGOUT\n", config.ups_name, varname);
+        if ((res > 0) && ((size_t)res >= sizeof(send_buffer))) {
                 printf("%s\n", _("UPS name to long for buffer"));
                 return ERROR;
         }
 
+        char temp_buffer[MAX_INPUT_BUFFER];
+
         /* send the command to the daemon and get a response back */
-        if (process_tcp_request
-                        (server_address, server_port, send_buffer, temp_buffer,
-                         sizeof (temp_buffer)) != STATE_OK) {
-                printf ("%s\n", _("Invalid response received from host"));
+        if (process_tcp_request(config.server_address, config.server_port,
+                                                        send_buffer, temp_buffer,
+                                                        sizeof(temp_buffer)) != STATE_OK) {
+                printf("%s\n", _("Invalid response received from host"));
                 return ERROR;
         }
 
-        ptr = temp_buffer;
-        len = strlen(ptr);
-        if (len > logout_len && strcmp (ptr + len - logout_len, logout) == 0) len -= logout_len;
-        if (len > 0 && ptr[len-1] == '\n') ptr[len-1]=0;
-        if (strcmp (ptr, "ERR UNKNOWN-UPS") == 0) {
-                printf (_("CRITICAL - no such UPS '%s' on that host\n"), ups_name);
+        char *ptr = temp_buffer;
+        int len = strlen(ptr);
+        const char *logout = "OK Goodbye\n";
+        const int logout_len = strlen(logout);
+
+        if (len > logout_len && strcmp(ptr + len - logout_len, logout) == 0) {
+                len -= logout_len;
+        }
+        if (len > 0 && ptr[len - 1] == '\n') {
+                ptr[len - 1] = 0;
+        }
+        if (strcmp(ptr, "ERR UNKNOWN-UPS") == 0) {
+                printf(_("CRITICAL - no such UPS '%s' on that host\n"),
+                           config.ups_name);
                 return ERROR;
         }
 
-        if (strcmp (ptr, "ERR VAR-NOT-SUPPORTED") == 0) {
+        if (strcmp(ptr, "ERR VAR-NOT-SUPPORTED") == 0) {
                 /*printf ("Error: Variable '%s' is not supported\n", varname);*/
                 return NOSUCHVAR;
         }
 
-        if (strcmp (ptr, "ERR DATA-STALE") == 0) {
-                printf ("%s\n", _("CRITICAL - UPS data is stale"));
+        if (strcmp(ptr, "ERR DATA-STALE") == 0) {
+                printf("%s\n", _("CRITICAL - UPS data is stale"));
                 return ERROR;
         }
 
-        if (strncmp (ptr, "ERR", 3) == 0) {
-                printf (_("Unknown error: %s\n"), ptr);
+        if (strncmp(ptr, "ERR", 3) == 0) {
+                printf(_("Unknown error: %s\n"), ptr);
                 return ERROR;
         }
 
-        ptr = temp_buffer + strlen (varname) + strlen (ups_name) + 6;
+        ptr = temp_buffer + strlen(varname) + strlen(config.ups_name) + 6;
         len = strlen(ptr);
-        if (len < 2 || ptr[0] != '"' || ptr[len-1] != '"') {
-                printf ("%s\n", _("Error: unable to parse variable"));
+        if (len < 2 || ptr[0] != '"' || ptr[len - 1] != '"') {
+                printf("%s\n", _("Error: unable to parse variable"));
                 return ERROR;
         }
-        strncpy (buf, ptr+1, len - 2);
+
+        *buf = 0;
+        strncpy(buf, ptr + 1, len - 2);
         buf[len - 2] = 0;
 
         return OK;
 }
 
-
 /* Command line: CHECK_UPS -H <host_address> -u ups [-p port] [-v variable]
                            [-wv warn_value] [-cv crit_value] [-to to_sec] */
 
-
 /* process command-line arguments */
-int
-process_arguments (int argc, char **argv)
-{
-        int c;
-
-        int option = 0;
-        static struct option longopts[] = {
-                {"hostname", required_argument, 0, 'H'},
-                {"ups", required_argument, 0, 'u'},
-                {"port", required_argument, 0, 'p'},
-                {"critical", required_argument, 0, 'c'},
-                {"warning", required_argument, 0, 'w'},
-                {"timeout", required_argument, 0, 't'},
-                {"temperature", no_argument, 0, 'T'},
-                {"variable", required_argument, 0, 'v'},
-                {"version", no_argument, 0, 'V'},
-                {"help", no_argument, 0, 'h'},
-                {0, 0, 0, 0}
-        };
-
-        if (argc < 2)
+int process_arguments(int argc, char **argv, ups_config *config) {
+
+        static struct option longopts[] = {{"hostname", required_argument, 0, 'H'},
+                                                                           {"ups", required_argument, 0, 'u'},
+                                                                           {"port", required_argument, 0, 'p'},
+                                                                           {"critical", required_argument, 0, 'c'},
+                                                                           {"warning", required_argument, 0, 'w'},
+                                                                           {"timeout", required_argument, 0, 't'},
+                                                                           {"temperature", no_argument, 0, 'T'},
+                                                                           {"variable", required_argument, 0, 'v'},
+                                                                           {"version", no_argument, 0, 'V'},
+                                                                           {"help", no_argument, 0, 'h'},
+                                                                           {0, 0, 0, 0}};
+
+        if (argc < 2) {
                 return ERROR;
+        }
 
+        int c;
         for (c = 1; c < argc; c++) {
-                if (strcmp ("-to", argv[c]) == 0)
-                        strcpy (argv[c], "-t");
-                else if (strcmp ("-wt", argv[c]) == 0)
-                        strcpy (argv[c], "-w");
-                else if (strcmp ("-ct", argv[c]) == 0)
-                        strcpy (argv[c], "-c");
+                if (strcmp("-to", argv[c]) == 0) {
+                        strcpy(argv[c], "-t");
+                } else if (strcmp("-wt", argv[c]) == 0) {
+                        strcpy(argv[c], "-w");
+                } else if (strcmp("-ct", argv[c]) == 0) {
+                        strcpy(argv[c], "-c");
+                }
         }
 
+        int option = 0;
         while (1) {
-                c = getopt_long (argc, argv, "hVTH:u:p:v:c:w:t:", longopts,
-                                                                         &option);
+                c = getopt_long(argc, argv, "hVTH:u:p:v:c:w:t:", longopts, &option);
 
-                if (c == -1 || c == EOF)
+                if (c == -1 || c == EOF) {
                         break;
+                }
 
                 switch (c) {
-                case '?':                                                                       /* help */
-                        usage5 ();
-                case 'H':                                                                       /* hostname */
-                        if (is_host (optarg)) {
-                                server_address = optarg;
-                        }
-                        else {
-                                usage2 (_("Invalid hostname/address"), optarg);
+                case '?': /* help */
+                        usage5();
+                case 'H': /* hostname */
+                        if (is_host(optarg)) {
+                                config->server_address = optarg;
+                        } else {
+                                usage2(_("Invalid hostname/address"), optarg);
                         }
                         break;
-                case 'T': /* FIXME: to be improved (ie "-T C" for Celsius or "-T F" for Fahrenheit) */
-                        temp_output_c = 1;
+                case 'T': /* FIXME: to be improved (ie "-T C" for Celsius or "-T F" for
+                                         Fahrenheit) */
+                        config->temp_output_c = true;
                         break;
-                case 'u':                                                                       /* ups name */
-                        ups_name = optarg;
+                case 'u': /* ups name */
+                        config->ups_name = optarg;
                         break;
-                case 'p':                                                                       /* port */
-                        if (is_intpos (optarg)) {
-                                server_port = atoi (optarg);
-                        }
-                        else {
-                                usage2 (_("Port must be a positive integer"), optarg);
+                case 'p': /* port */
+                        if (is_intpos(optarg)) {
+                                config->server_port = atoi(optarg);
+                        } else {
+                                usage2(_("Port must be a positive integer"), optarg);
                         }
                         break;
-                case 'c':                                                                       /* critical time threshold */
-                        if (is_intnonneg (optarg)) {
-                                critical_value = atoi (optarg);
-                                check_crit = TRUE;
-                        }
-                        else {
-                                usage2 (_("Critical time must be a positive integer"), optarg);
+                case 'c': /* critical time threshold */
+                        if (is_intnonneg(optarg)) {
+                                config->critical_value = atoi(optarg);
+                                config->check_crit = true;
+                        } else {
+                                usage2(_("Critical time must be a positive integer"), optarg);
                         }
                         break;
-                case 'w':                                                                       /* warning time threshold */
-                        if (is_intnonneg (optarg)) {
-                                warning_value = atoi (optarg);
-                                check_warn = TRUE;
-                        }
-                        else {
-                                usage2 (_("Warning time must be a positive integer"), optarg);
+                case 'w': /* warning time threshold */
+                        if (is_intnonneg(optarg)) {
+                                config->warning_value = atoi(optarg);
+                                config->check_warn = true;
+                        } else {
+                                usage2(_("Warning time must be a positive integer"), optarg);
                         }
                         break;
-                case 'v':                                                                       /* variable */
-                        if (!strcmp (optarg, "LINE"))
-                                check_variable = UPS_UTILITY;
-                        else if (!strcmp (optarg, "TEMP"))
-                                check_variable = UPS_TEMP;
-                        else if (!strcmp (optarg, "BATTPCT"))
-                                check_variable = UPS_BATTPCT;
-                        else if (!strcmp (optarg, "LOADPCT"))
-                                check_variable = UPS_LOADPCT;
-                        else
-                                usage2 (_("Unrecognized UPS variable"), optarg);
-                        break;
-                case 't':                                                                       /* timeout */
-                        if (is_intnonneg (optarg)) {
-                                socket_timeout = atoi (optarg);
+                case 'v': /* variable */
+                        if (!strcmp(optarg, "LINE")) {
+                                config->check_variable = UPS_UTILITY;
+                        } else if (!strcmp(optarg, "TEMP")) {
+                                config->check_variable = UPS_TEMP;
+                        } else if (!strcmp(optarg, "BATTPCT")) {
+                                config->check_variable = UPS_BATTPCT;
+                        } else if (!strcmp(optarg, "LOADPCT")) {
+                                config->check_variable = UPS_LOADPCT;
+                        } else if (!strcmp(optarg, "REALPOWER")) {
+                                config->check_variable = UPS_REALPOWER;
+                        } else {
+                                usage2(_("Unrecognized UPS variable"), optarg);
                         }
-                        else {
-                                usage4 (_("Timeout interval must be a positive integer"));
+                        break;
+                case 't': /* timeout */
+                        if (is_intnonneg(optarg)) {
+                                socket_timeout = atoi(optarg);
+                        } else {
+                                usage4(_("Timeout interval must be a positive integer"));
                         }
                         break;
-                case 'V':                                                                       /* version */
-                        print_revision (progname, NP_VERSION);
-                        exit (STATE_UNKNOWN);
-                case 'h':                                                                       /* help */
-                        print_help ();
-                        exit (STATE_UNKNOWN);
+                case 'V': /* version */
+                        print_revision(progname, NP_VERSION);
+                        exit(STATE_UNKNOWN);
+                case 'h': /* help */
+                        print_help();
+                        exit(STATE_UNKNOWN);
                 }
         }
 
-
-        if (server_address == NULL && argc > optind) {
-                if (is_host (argv[optind]))
-                        server_address = argv[optind++];
-                else
-                        usage2 (_("Invalid hostname/address"), optarg);
+        if (config->server_address == NULL && argc > optind) {
+                if (is_host(argv[optind])) {
+                        config->server_address = argv[optind++];
+                } else {
+                        usage2(_("Invalid hostname/address"), optarg);
+                }
         }
 
-        if (server_address == NULL)
-                server_address = strdup("127.0.0.1");
+        if (config->server_address == NULL) {
+                config->server_address = strdup("127.0.0.1");
+        }
 
-        return validate_arguments();
+        return validate_arguments(*config);
 }
 
-
-int
-validate_arguments (void)
-{
-        if (! ups_name) {
-                printf ("%s\n", _("Error : no UPS indicated"));
+int validate_arguments(ups_config config) {
+        if (!config.ups_name) {
+                printf("%s\n", _("Error : no UPS indicated"));
                 return ERROR;
         }
         return OK;
 }
 
+void print_help(void) {
+        print_revision(progname, NP_VERSION);
 
-void
-print_help (void)
-{
-        char *myport;
-        xasprintf (&myport, "%d", PORT);
-
-        print_revision (progname, NP_VERSION);
-
-        printf ("Copyright (c) 2000 Tom Shields\n");
-        printf ("Copyright (c) 2004 Alain Richard <alain.richard@equation.fr>\n");
-        printf ("Copyright (c) 2004 Arnaud Quette <arnaud.quette@mgeups.com>\n");
-        printf (COPYRIGHT, copyright, email);
-
-        printf ("%s\n", _("This plugin tests the UPS service on the specified host. Network UPS Tools"));
-  printf ("%s\n", _("from www.networkupstools.org must be running for this plugin to work."));
-
-  printf ("\n\n");
-
-        print_usage ();
+        printf("Copyright (c) 2000 Tom Shields\n");
+        printf("Copyright (c) 2004 Alain Richard <alain.richard@equation.fr>\n");
+        printf("Copyright (c) 2004 Arnaud Quette <arnaud.quette@mgeups.com>\n");
+        printf(COPYRIGHT, copyright, email);
 
-        printf (UT_HELP_VRSN);
-        printf (UT_EXTRA_OPTS);
+        printf("%s\n", _("This plugin tests the UPS service on the specified host. "
+                                         "Network UPS Tools"));
+        printf("%s\n", _("from www.networkupstools.org must be running for this "
+                                         "plugin to work."));
 
-        printf (UT_HOST_PORT, 'p', myport);
+        printf("\n\n");
 
-        printf (" %s\n", "-u, --ups=STRING");
-  printf ("    %s\n", _("Name of UPS"));
-  printf (" %s\n", "-T, --temperature");
-  printf ("    %s\n", _("Output of temperatures in Celsius"));
-  printf (" %s\n", "-v, --variable=STRING");
-  printf ("    %s %s\n", _("Valid values for STRING are"), "LINE, TEMP, BATTPCT or LOADPCT");
+        print_usage();
 
-        printf (UT_WARN_CRIT);
+        printf(UT_HELP_VRSN);
+        printf(UT_EXTRA_OPTS);
 
-        printf (UT_CONN_TIMEOUT, DEFAULT_SOCKET_TIMEOUT);
-
-/* TODO: -v clashing with -v/-variable. Commenting out help text since verbose
-         is unused up to now */
-/*      printf (UT_VERBOSE); */
-
-  printf ("\n");
-        printf ("%s\n", _("This plugin attempts to determine the status of a UPS (Uninterruptible Power"));
-  printf ("%s\n", _("Supply) on a local or remote host. If the UPS is online or calibrating, the"));
-  printf ("%s\n", _("plugin will return an OK state. If the battery is on it will return a WARNING"));
-  printf ("%s\n", _("state. If the UPS is off or has a low battery the plugin will return a CRITICAL"));
-  printf ("%s\n", _("state."));
-
-  printf ("\n");
-  printf ("%s\n", _("Notes:"));
-  printf (" %s\n", _("You may also specify a variable to check (such as temperature, utility voltage,"));
-  printf (" %s\n", _("battery load, etc.) as well as warning and critical thresholds for the value"));
-  printf (" %s\n", _("of that variable.  If the remote host has multiple UPS that are being monitored"));
-  printf (" %s\n", _("you will have to use the --ups option to specify which UPS to check."));
-  printf ("\n");
-  printf (" %s\n", _("This plugin requires that the UPSD daemon distributed with Russell Kroll's"));
-  printf (" %s\n", _("Network UPS Tools be installed on the remote host. If you do not have the"));
-  printf (" %s\n", _("package installed on your system, you can download it from"));
-  printf (" %s\n", _("http://www.networkupstools.org"));
-
-        printf (UT_SUPPORT);
+        char *myport;
+        xasprintf(&myport, "%d", PORT);
+        printf(UT_HOST_PORT, 'p', myport);
+
+        printf(" %s\n", "-u, --ups=STRING");
+        printf("    %s\n", _("Name of UPS"));
+        printf(" %s\n", "-T, --temperature");
+        printf("    %s\n", _("Output of temperatures in Celsius"));
+        printf(" %s\n", "-v, --variable=STRING");
+        printf("    %s %s\n", _("Valid values for STRING are"),
+                   "LINE, TEMP, BATTPCT, LOADPCT or REALPOWER");
+
+        printf(UT_WARN_CRIT);
+
+        printf(UT_CONN_TIMEOUT, DEFAULT_SOCKET_TIMEOUT);
+
+        /* TODO: -v clashing with -v/-variable. Commenting out help text since
+           verbose is unused up to now */
+        /*      printf (UT_VERBOSE); */
+
+        printf("\n");
+        printf("%s\n", _("This plugin attempts to determine the status of a UPS "
+                                         "(Uninterruptible Power"));
+        printf("%s\n", _("Supply) on a local or remote host. If the UPS is online "
+                                         "or calibrating, the"));
+        printf("%s\n", _("plugin will return an OK state. If the battery is on it "
+                                         "will return a WARNING"));
+        printf("%s\n", _("state. If the UPS is off or has a low battery the plugin "
+                                         "will return a CRITICAL"));
+        printf("%s\n", _("state."));
+
+        printf("\n");
+        printf("%s\n", _("Notes:"));
+        printf(" %s\n", _("You may also specify a variable to check (such as "
+                                          "temperature, utility voltage,"));
+        printf(" %s\n", _("battery load, etc.) as well as warning and critical "
+                                          "thresholds for the value"));
+        printf(" %s\n", _("of that variable.  If the remote host has multiple UPS "
+                                          "that are being monitored"));
+        printf(" %s\n", _("you will have to use the --ups option to specify which "
+                                          "UPS to check."));
+        printf("\n");
+        printf(" %s\n", _("This plugin requires that the UPSD daemon distributed "
+                                          "with Russell Kroll's"));
+        printf(" %s\n", _("Network UPS Tools be installed on the remote host. If "
+                                          "you do not have the"));
+        printf(" %s\n",
+                   _("package installed on your system, you can download it from"));
+        printf(" %s\n", _("http://www.networkupstools.org"));
+
+        printf(UT_SUPPORT);
 }
 
-
-void
-print_usage (void)
-{
-  printf ("%s\n", _("Usage:"));
-        printf ("%s -H host -u ups [-p port] [-v variable] [-w warn_value] [-c crit_value] [-to to_sec] [-T]\n", progname);
+void print_usage(void) {
+        printf("%s\n", _("Usage:"));
+        printf("%s -H host -u ups [-p port] [-v variable] [-w warn_value] [-c "
+                   "crit_value] [-to to_sec] [-T]\n",
+                   progname);
 }
diff --git a/plugins/check_users.c b/plugins/check_users.c
index 2a9ee986..89b95369 100644
--- a/plugins/check_users.c
+++ b/plugins/check_users.c
@@ -179,7 +179,7 @@ main (int argc, char **argv)
                 printf (_("USERS %s - %d users currently logged in |%s\n"),
                                 state_text(result), users,
                                 sperfdata_int("users", users, "", warning_range,
-                                                        critical_range, TRUE, 0, FALSE, 0));
+                                                        critical_range, true, 0, false, 0));
         }
 
         return result;
@@ -202,7 +202,7 @@ process_arguments (int argc, char **argv)
         if (argc < 2)
                 usage ("\n");
 
-        while (1) {
+        while (true) {
                 c = getopt_long (argc, argv, "+hVvc:w:", longopts, &option);
 
                 if (c == -1 || c == EOF || c == 1)
@@ -227,18 +227,23 @@ process_arguments (int argc, char **argv)
         }
 
         c = optind;
+
         if (warning_range == NULL && argc > c)
                 warning_range = argv[c++];
+
         if (critical_range == NULL && argc > c)
                 critical_range = argv[c++];
 
         /* this will abort in case of invalid ranges */
         set_thresholds (&thlds, warning_range, critical_range);
 
-        if (thlds->warning->end < 0)
-                usage4 (_("Warning threshold must be a positive integer"));
-        if (thlds->critical->end < 0)
-                usage4 (_("Critical threshold must be a positive integer"));
+        if (!thlds->warning) {
+                usage4 (_("Warning threshold must be a valid range expression"));
+        }
+
+        if (!thlds->critical) {
+                usage4 (_("Critical threshold must be a valid range expression"));
+        }
 
         return OK;
 }
@@ -261,10 +266,10 @@ print_help (void)
         printf (UT_HELP_VRSN);
         printf (UT_EXTRA_OPTS);
 
-        printf (" %s\n", "-w, --warning=INTEGER");
-        printf ("    %s\n", _("Set WARNING status if more than INTEGER users are logged in"));
-        printf (" %s\n", "-c, --critical=INTEGER");
-        printf ("    %s\n", _("Set CRITICAL status if more than INTEGER users are logged in"));
+        printf (" %s\n", "-w, --warning=RANGE_EXPRESSION");
+        printf ("    %s\n", _("Set WARNING status if number of logged in users violates RANGE_EXPRESSION"));
+        printf (" %s\n", "-c, --critical=RANGE_EXPRESSION");
+        printf ("    %s\n", _("Set CRITICAL status if number of logged in users violates RANGE_EXPRESSION"));
 
         printf (UT_SUPPORT);
 }
diff --git a/plugins/common.h b/plugins/common.h
index 0f08e2f6..833479ce 100644
--- a/plugins/common.h
+++ b/plugins/common.h
@@ -184,14 +184,6 @@ enum {
         ERROR = -1
 };
 
-/* AIX seems to have this defined somewhere else */
-#ifndef FALSE
-enum {
-        FALSE,
-        TRUE
-};
-#endif
-
 enum {
         STATE_OK,
         STATE_WARNING,
@@ -225,18 +217,4 @@ enum {
 # define __attribute__(x) /* do nothing */
 #endif
 
-/* Try sysconf(_SC_OPEN_MAX) first, as it can be higher than OPEN_MAX.
- * If that fails and the macro isn't defined, we fall back to an educated
- * guess. There's no guarantee that our guess is adequate and the program
- * will die with SIGSEGV if it isn't and the upper boundary is breached. */
-#define DEFAULT_MAXFD  256   /* fallback value if no max open files value is set */
-#define MAXFD_LIMIT   8192   /* upper limit of open files */
-#ifdef _SC_OPEN_MAX
-static long maxfd = 0;
-#elif defined(OPEN_MAX)
-# define maxfd OPEN_MAX
-#else   /* sysconf macro unavailable, so guess (may be wildly inaccurate) */
-# define maxfd DEFAULT_MAXFD
-#endif
-
 #endif /* _COMMON_H_ */
diff --git a/plugins/negate.c b/plugins/negate.c
index 50f62d33..c5fe7e13 100644
--- a/plugins/negate.c
+++ b/plugins/negate.c
@@ -47,7 +47,7 @@ static const char **process_arguments (int, char **);
 void validate_arguments (char **);
 void print_help (void);
 void print_usage (void);
-int subst_text = FALSE;
+bool subst_text = false;
 
 static int state[4] = {
         STATE_OK,
@@ -63,7 +63,6 @@ main (int argc, char **argv)
         char *sub;
         char **command_line;
         output chld_out, chld_err;
-        int i;
 
         setlocale (LC_ALL, "");
         bindtextdomain (PACKAGE, LOCALEDIR);
@@ -86,7 +85,7 @@ main (int argc, char **argv)
                 result = cmd_run_array (command_line, &chld_out, &chld_err, 0);
         }
         if (chld_err.lines > 0) {
-                for (i = 0; i < chld_err.lines; i++) {
+                for (size_t i = 0; i < chld_err.lines; i++) {
                         fprintf (stderr, "%s\n", chld_err.line[i]);
                 }
         }
@@ -95,7 +94,7 @@ main (int argc, char **argv)
         if (chld_out.lines == 0)
                 die (max_state_alt (result, STATE_UNKNOWN), _("No data returned from command\n"));
 
-        for (i = 0; i < chld_out.lines; i++) {
+        for (size_t i = 0; i < chld_out.lines; i++) {
                 if (subst_text && result >= 0 && result <= 4 && result != state[result])  {
                         /* Loop over each match found */
                         while ((sub = strstr (chld_out.line[i], state_text (result)))) {
@@ -122,7 +121,7 @@ static const char **
 process_arguments (int argc, char **argv)
 {
         int c;
-        int permute = TRUE;
+        bool permute = true;
 
         int option = 0;
         static struct option longopts[] = {
@@ -168,26 +167,26 @@ process_arguments (int argc, char **argv)
                 case 'o':     /* replacement for OK */
                         if ((state[STATE_OK] = mp_translate_state(optarg)) == ERROR)
                                 usage4 (_("Ok must be a valid state name (OK, WARNING, CRITICAL, UNKNOWN) or integer (0-3)."));
-                        permute = FALSE;
+                        permute = false;
                         break;
 
                 case 'w':     /* replacement for WARNING */
                         if ((state[STATE_WARNING] = mp_translate_state(optarg)) == ERROR)
                                 usage4 (_("Warning must be a valid state name (OK, WARNING, CRITICAL, UNKNOWN) or integer (0-3)."));
-                        permute = FALSE;
+                        permute = false;
                         break;
                 case 'c':     /* replacement for CRITICAL */
                         if ((state[STATE_CRITICAL] = mp_translate_state(optarg)) == ERROR)
                                 usage4 (_("Critical must be a valid state name (OK, WARNING, CRITICAL, UNKNOWN) or integer (0-3)."));
-                        permute = FALSE;
+                        permute = false;
                         break;
                 case 'u':     /* replacement for UNKNOWN */
                         if ((state[STATE_UNKNOWN] = mp_translate_state(optarg)) == ERROR)
                                 usage4 (_("Unknown must be a valid state name (OK, WARNING, CRITICAL, UNKNOWN) or integer (0-3)."));
-                        permute = FALSE;
+                        permute = false;
                         break;
                 case 's':     /* Substitute status text */
-                        subst_text = TRUE;
+                        subst_text = true;
                         break;
                 }
         }
@@ -221,8 +220,10 @@ print_help (void)
 
         printf (COPYRIGHT, copyright, email);
 
-        printf ("%s\n", _("Negates the status of a plugin (returns OK for CRITICAL and vice-versa)."));
-        printf ("%s\n", _("Additional switches can be used to control which state becomes what."));
+        printf ("%s\n", _("Negates only the return code of a plugin (returns OK for CRITICAL and vice-versa) by default."));
+        printf ("%s\n", _("Additional switches can be used to control:\n"));
+        printf ("\t  - which state becomes what\n");
+        printf ("\t  - changing the plugin output text to match the return code");
 
         printf ("\n\n");
 
diff --git a/plugins/netutils.c b/plugins/netutils.c
index 1bb4f076..c6af248e 100644
--- a/plugins/netutils.c
+++ b/plugins/netutils.c
@@ -34,7 +34,7 @@ unsigned int socket_timeout = DEFAULT_SOCKET_TIMEOUT;
 unsigned int socket_timeout_state = STATE_CRITICAL;
 
 int econn_refuse_state = STATE_CRITICAL;
-int was_refused = FALSE;
+bool was_refused = false;
 #if USE_IPV6
 int address_family = AF_UNSPEC;
 #else
@@ -215,14 +215,14 @@ np_net_connect (const char *host_name, int port, int *sd, int proto)
                         result = connect (*sd, r->ai_addr, r->ai_addrlen);
 
                         if (result == 0) {
-                                was_refused = FALSE;
+                                was_refused = false;
                                 break;
                         }
 
                         if (result < 0) {
                                 switch (errno) {
                                 case ECONNREFUSED:
-                                        was_refused = TRUE;
+                                        was_refused = true;
                                         break;
                                 }
                         }
@@ -246,7 +246,7 @@ np_net_connect (const char *host_name, int port, int *sd, int proto)
                 }
                 result = connect(*sd, (struct sockaddr *)&su, sizeof(su));
                 if (result < 0 && errno == ECONNREFUSED)
-                        was_refused = TRUE;
+                        was_refused = true;
         }
 
         if (result == 0)
@@ -326,13 +326,11 @@ send_request (int sd, int proto, const char *send_buffer, char *recv_buffer, int
 }
 
 
-int
-is_host (const char *address)
-{
+bool is_host (const char *address) {
         if (is_addr (address) || is_hostname (address))
-                return (TRUE);
+                return (true);
 
-        return (FALSE);
+        return (false);
 }
 
 void
@@ -342,20 +340,18 @@ host_or_die(const char *str)
                 usage_va(_("Invalid hostname/address - %s"), str);
 }
 
-int
-is_addr (const char *address)
-{
+bool is_addr (const char *address) {
 #ifdef USE_IPV6
         if (address_family == AF_INET && is_inet_addr (address))
-                return TRUE;
+                return true;
         else if (address_family == AF_INET6 && is_inet6_addr (address))
-                return TRUE;
+                return true;
 #else
         if (is_inet_addr (address))
-                return (TRUE);
+                return (true);
 #endif
 
-        return (FALSE);
+        return (false);
 }
 
 int
@@ -370,10 +366,10 @@ dns_lookup (const char *in, struct sockaddr_storage *ss, int family)
 
         retval = getaddrinfo (in, NULL, &hints, &res);
         if (retval != 0)
-                return FALSE;
+                return false;
 
         if (ss != NULL)
                 memcpy (ss, res->ai_addr, res->ai_addrlen);
         freeaddrinfo (res);
-        return TRUE;
+        return true;
 }
diff --git a/plugins/netutils.h b/plugins/netutils.h
index d7ee0ddd..a95057e0 100644
--- a/plugins/netutils.h
+++ b/plugins/netutils.h
@@ -73,8 +73,8 @@ int send_request (int sd, int proto, const char *send_buffer, char *recv_buffer,
 
 
 /* "is_*" wrapper macros and functions */
-int is_host (const char *);
-int is_addr (const char *);
+bool is_host (const char *);
+bool is_addr (const char *);
 int dns_lookup (const char *, struct sockaddr_storage *, int);
 void host_or_die(const char *str);
 #define resolve_host_or_addr(addr, family) dns_lookup(addr, NULL, family)
@@ -89,10 +89,10 @@ void host_or_die(const char *str);
 extern unsigned int socket_timeout;
 extern unsigned int socket_timeout_state;
 extern int econn_refuse_state;
-extern int was_refused;
+extern bool was_refused;
 extern int address_family;
 
-RETSIGTYPE socket_timeout_alarm_handler (int) __attribute__((noreturn));
+void socket_timeout_alarm_handler (int) __attribute__((noreturn));
 
 /* SSL-Related functionality */
 #ifdef HAVE_SSL
diff --git a/plugins/popen.c b/plugins/popen.c
index 723817d5..54e63bc5 100644
--- a/plugins/popen.c
+++ b/plugins/popen.c
@@ -38,8 +38,9 @@
 * 
 *****************************************************************************/
 
-#include "common.h"
-#include "utils.h"
+#include "./common.h"
+#include "./utils.h"
+#include "../lib/maxfd.h"
 
 /* extern so plugin has pid to kill exec'd process on timeouts */
 extern pid_t *childpid;
@@ -49,9 +50,9 @@ extern FILE *child_process;
 FILE *spopen (const char *);
 int spclose (FILE *);
 #ifdef REDHAT_SPOPEN_ERROR
-RETSIGTYPE popen_sigchld_handler (int);
+void popen_sigchld_handler (int);
 #endif
-RETSIGTYPE popen_timeout_alarm_handler (int);
+void popen_timeout_alarm_handler (int);
 
 #include <stdarg.h>                                                     /* ANSI C header file */
 #include <fcntl.h>
@@ -104,7 +105,7 @@ spopen (const char *cmdstring)
 #endif
 
         env[0] = strdup("LC_ALL=C");
-        env[1] = '\0';
+        env[1] = NULL;
 
         /* if no command was passed, return with no error */
         if (cmdstring == NULL)
@@ -177,8 +178,7 @@ spopen (const char *cmdstring)
         }
         argv[i] = NULL;
 
-        if(maxfd == 0)
-                maxfd = open_max();
+        long maxfd = mp_open_max();
 
         if (childpid == NULL) {                         /* first time through */
                 if ((childpid = calloc ((size_t)maxfd, sizeof (pid_t))) == NULL)
@@ -266,7 +266,7 @@ spclose (FILE * fp)
 }
 
 #ifdef REDHAT_SPOPEN_ERROR
-RETSIGTYPE
+void
 popen_sigchld_handler (int signo)
 {
         if (signo == SIGCHLD)
@@ -274,7 +274,7 @@ popen_sigchld_handler (int signo)
 }
 #endif
 
-RETSIGTYPE
+void
 popen_timeout_alarm_handler (int signo)
 {
         int fh;
diff --git a/plugins/popen.h b/plugins/popen.h
index a5dd8fa7..1ea69632 100644
--- a/plugins/popen.h
+++ b/plugins/popen.h
@@ -5,7 +5,7 @@
 
 FILE *spopen (const char *);
 int spclose (FILE *);
-RETSIGTYPE popen_timeout_alarm_handler (int);
+void popen_timeout_alarm_handler (int);
 
 pid_t *childpid=NULL;
 int *child_stderr_array=NULL;
diff --git a/plugins/runcmd.c b/plugins/runcmd.c
index 102191e4..ed49bb99 100644
--- a/plugins/runcmd.c
+++ b/plugins/runcmd.c
@@ -60,6 +60,8 @@
 # define SIG_ERR ((Sigfunc *)-1)
 #endif
 
+#include "../lib/maxfd.h"
+
 /* This variable must be global, since there's no way the caller
  * can forcibly slay a dead or ungainly running program otherwise.
  * Multithreading apps and plugins can initialize it (via NP_RUNCMD_INIT)
@@ -88,8 +90,7 @@ extern void die (int, const char *, ...)
  * through this api and thus achieve async-safeness throughout the api */
 void np_runcmd_init(void)
 {
-        if(maxfd == 0)
-                maxfd = open_max();
+  long maxfd = mp_open_max();
         if(!np_pids) np_pids = calloc(maxfd, sizeof(pid_t));
 }
 
@@ -114,7 +115,7 @@ np_runcmd_open(const char *cmdstring, int *pfd, int *pfderr)
         if(!np_pids) NP_RUNCMD_INIT;
 
         env[0] = strdup("LC_ALL=C");
-        env[1] = '\0';
+        env[1] = NULL;
 
         /* make copy of command string so strtok() doesn't silently modify it */
         /* (the calling program may want to access it later) */
@@ -192,6 +193,7 @@ np_runcmd_open(const char *cmdstring, int *pfd, int *pfderr)
                 /* close all descriptors in np_pids[]
                  * This is executed in a separate address space (pure child),
                  * so we don't have to worry about async safety */
+    long maxfd = mp_open_max();
                 for (i = 0; i < maxfd; i++)
                         if(np_pids[i] > 0)
                                 close (i);
@@ -219,6 +221,7 @@ np_runcmd_close(int fd)
         pid_t pid;
 
         /* make sure this fd was opened by popen() */
+  long maxfd = mp_open_max();
         if(fd < 0 || fd > maxfd || !np_pids || (pid = np_pids[fd]) == 0)
                 return -1;
 
@@ -237,12 +240,12 @@ np_runcmd_close(int fd)
 void
 runcmd_timeout_alarm_handler (int signo)
 {
-        size_t i;
 
         if (signo == SIGALRM)
                 puts(_("CRITICAL - Plugin timed out while executing system call"));
 
-        if(np_pids) for(i = 0; i < maxfd; i++) {
+  long maxfd = mp_open_max();
+        if(np_pids) for(long int i = 0; i < maxfd; i++) {
                 if(np_pids[i] != 0) kill(np_pids[i], SIGKILL);
         }
 
diff --git a/plugins/sslutils.c b/plugins/sslutils.c
index 666a0120..6bc0ba81 100644
--- a/plugins/sslutils.c
+++ b/plugins/sslutils.c
@@ -31,9 +31,8 @@
 #include "netutils.h"
 
 #ifdef HAVE_SSL
-static SSL_CTX *c=NULL;
+static SSL_CTX *ctx=NULL;
 static SSL *s=NULL;
-static int initialized=0;
 
 int np_net_ssl_init(int sd) {
         return np_net_ssl_init_with_hostname(sd, NULL);
@@ -48,24 +47,24 @@ int np_net_ssl_init_with_hostname_and_version(int sd, char *host_name, int versi
 }
 
 int np_net_ssl_init_with_hostname_version_and_cert(int sd, char *host_name, int version, char *cert, char *privkey) {
-        const SSL_METHOD *method = NULL;
         long options = 0;
 
+        if ((ctx = SSL_CTX_new(TLS_client_method())) == NULL) {
+                printf("%s\n", _("CRITICAL - Cannot create SSL context."));
+                return STATE_CRITICAL;
+        }
+
         switch (version) {
         case MP_SSLv2: /* SSLv2 protocol */
-#if defined(USE_GNUTLS) || defined(OPENSSL_NO_SSL2)
                 printf("%s\n", _("UNKNOWN - SSL protocol version 2 is not supported by your SSL library."));
                 return STATE_UNKNOWN;
-#else
-                method = SSLv2_client_method();
-                break;
-#endif
         case MP_SSLv3: /* SSLv3 protocol */
 #if defined(OPENSSL_NO_SSL3)
                 printf("%s\n", _("UNKNOWN - SSL protocol version 3 is not supported by your SSL library."));
                 return STATE_UNKNOWN;
 #else
-                method = SSLv3_client_method();
+                SSL_CTX_set_min_proto_version(ctx, SSL3_VERSION);
+                SSL_CTX_set_max_proto_version(ctx, SSL3_VERSION);
                 break;
 #endif
         case MP_TLSv1: /* TLSv1 protocol */
@@ -73,7 +72,8 @@ int np_net_ssl_init_with_hostname_version_and_cert(int sd, char *host_name, int
                 printf("%s\n", _("UNKNOWN - TLS protocol version 1 is not supported by your SSL library."));
                 return STATE_UNKNOWN;
 #else
-                method = TLSv1_client_method();
+                SSL_CTX_set_min_proto_version(ctx, TLS1_VERSION);
+                SSL_CTX_set_max_proto_version(ctx, TLS1_VERSION);
                 break;
 #endif
         case MP_TLSv1_1: /* TLSv1.1 protocol */
@@ -81,7 +81,8 @@ int np_net_ssl_init_with_hostname_version_and_cert(int sd, char *host_name, int
                 printf("%s\n", _("UNKNOWN - TLS protocol version 1.1 is not supported by your SSL library."));
                 return STATE_UNKNOWN;
 #else
-                method = TLSv1_1_client_method();
+                SSL_CTX_set_min_proto_version(ctx, TLS1_1_VERSION);
+                SSL_CTX_set_max_proto_version(ctx, TLS1_1_VERSION);
                 break;
 #endif
         case MP_TLSv1_2: /* TLSv1.2 protocol */
@@ -89,7 +90,8 @@ int np_net_ssl_init_with_hostname_version_and_cert(int sd, char *host_name, int
                 printf("%s\n", _("UNKNOWN - TLS protocol version 1.2 is not supported by your SSL library."));
                 return STATE_UNKNOWN;
 #else
-                method = TLSv1_2_client_method();
+                SSL_CTX_set_min_proto_version(ctx, TLS1_2_VERSION);
+                SSL_CTX_set_max_proto_version(ctx, TLS1_2_VERSION);
                 break;
 #endif
         case MP_TLSv1_2_OR_NEWER:
@@ -97,56 +99,43 @@ int np_net_ssl_init_with_hostname_version_and_cert(int sd, char *host_name, int
                 printf("%s\n", _("UNKNOWN - Disabling TLSv1.1 is not supported by your SSL library."));
                 return STATE_UNKNOWN;
 #else
-                options |= SSL_OP_NO_TLSv1_1;
+                SSL_CTX_set_min_proto_version(ctx, TLS1_2_VERSION);
+                break;
 #endif
-                /* FALLTHROUGH */
         case MP_TLSv1_1_OR_NEWER:
 #if !defined(SSL_OP_NO_TLSv1)
                 printf("%s\n", _("UNKNOWN - Disabling TLSv1 is not supported by your SSL library."));
                 return STATE_UNKNOWN;
 #else
-                options |= SSL_OP_NO_TLSv1;
+                SSL_CTX_set_min_proto_version(ctx, TLS1_1_VERSION);
+                break;
 #endif
-                /* FALLTHROUGH */
         case MP_TLSv1_OR_NEWER:
 #if defined(SSL_OP_NO_SSLv3)
-                options |= SSL_OP_NO_SSLv3;
+                SSL_CTX_set_min_proto_version(ctx, TLS1_VERSION);
+                break;
 #endif
-                /* FALLTHROUGH */
         case MP_SSLv3_OR_NEWER:
 #if defined(SSL_OP_NO_SSLv2)
-                options |= SSL_OP_NO_SSLv2;
+                SSL_CTX_set_min_proto_version(ctx, SSL3_VERSION);
+                break;
 #endif
-        case MP_SSLv2_OR_NEWER:
-                /* FALLTHROUGH */
-        default: /* Default to auto negotiation */
-                method = SSLv23_client_method();
-        }
-        if (!initialized) {
-                /* Initialize SSL context */
-                SSLeay_add_ssl_algorithms();
-                SSL_load_error_strings();
-                OpenSSL_add_all_algorithms();
-                initialized = 1;
-        }
-        if ((c = SSL_CTX_new(method)) == NULL) {
-                printf("%s\n", _("CRITICAL - Cannot create SSL context."));
-                return STATE_CRITICAL;
         }
+
         if (cert && privkey) {
 #ifdef USE_OPENSSL
-                if (!SSL_CTX_use_certificate_chain_file(c, cert)) {
+                if (!SSL_CTX_use_certificate_chain_file(ctx, cert)) {
 #elif  USE_GNUTLS
-                if (!SSL_CTX_use_certificate_file(c, cert, SSL_FILETYPE_PEM)) {
+                if (!SSL_CTX_use_certificate_file(ctx, cert, SSL_FILETYPE_PEM)) {
 #else
 #error Unported for unknown SSL library
 #endif
                         printf ("%s\n", _("CRITICAL - Unable to open certificate chain file!\n"));
                         return STATE_CRITICAL;
                 }
-                SSL_CTX_use_PrivateKey_file(c, privkey, SSL_FILETYPE_PEM);
+                SSL_CTX_use_PrivateKey_file(ctx, privkey, SSL_FILETYPE_PEM);
 #ifdef USE_OPENSSL
-                if (!SSL_CTX_check_private_key(c)) {
+                if (!SSL_CTX_check_private_key(ctx)) {
                         printf ("%s\n", _("CRITICAL - Private key does not seem to match certificate!\n"));
                         return STATE_CRITICAL;
                 }
@@ -155,9 +144,9 @@ int np_net_ssl_init_with_hostname_version_and_cert(int sd, char *host_name, int
 #ifdef SSL_OP_NO_TICKET
         options |= SSL_OP_NO_TICKET;
 #endif
-        SSL_CTX_set_options(c, options);
-        SSL_CTX_set_mode(c, SSL_MODE_AUTO_RETRY);
-        if ((s = SSL_new(c)) != NULL) {
+        SSL_CTX_set_options(ctx, options);
+        SSL_CTX_set_mode(ctx, SSL_MODE_AUTO_RETRY);
+        if ((s = SSL_new(ctx)) != NULL) {
 #ifdef SSL_set_tlsext_host_name
                 if (host_name != NULL)
                         SSL_set_tlsext_host_name(s, host_name);
@@ -184,9 +173,9 @@ void np_net_ssl_cleanup() {
 #endif
                 SSL_shutdown(s);
                 SSL_free(s);
-                if (c) {
-                        SSL_CTX_free(c);
-                        c=NULL;
+                if (ctx) {
+                        SSL_CTX_free(ctx);
+                        ctx=NULL;
                 }
                 s=NULL;
         }
diff --git a/plugins/t/check_curl.t b/plugins/t/check_curl.t
index eae98cc1..7a930a4e 100644
--- a/plugins/t/check_curl.t
+++ b/plugins/t/check_curl.t
@@ -205,9 +205,9 @@ SKIP: {
         like  ( $res->output, '/time_connect=[\d\.]+/', 'Extended Performance Data Output OK' );
         like  ( $res->output, '/time_ssl=[\d\.]+/', 'Extended Performance Data SSL Output OK' );
 
-        $res = NPTest->testCmd( "./$plugin -H www.mozilla.com -u /firefox -f curl" );
+        $res = NPTest->testCmd( "./$plugin -H monitoring-plugins.org -u /download.html -f follow" );
         is( $res->return_code, 0, "Redirection based on location is okay");
 
-        $res = NPTest->testCmd( "./$plugin -H www.mozilla.com --extended-perfdata" );
+        $res = NPTest->testCmd( "./$plugin -H monitoring-plugins.org --extended-perfdata" );
         like  ( $res->output, '/time_connect=[\d\.]+/', 'Extended Performance Data Output OK' );
 }
diff --git a/plugins/t/check_disk.t b/plugins/t/check_disk.t
index ca035ce7..9eb77ce4 100644
--- a/plugins/t/check_disk.t
+++ b/plugins/t/check_disk.t
@@ -23,11 +23,11 @@ my $mountpoint2_valid = getTestParameter( "NP_MOUNTPOINT2_VALID", "Path to anoth
 if ($mountpoint_valid eq "" or $mountpoint2_valid eq "") {
         plan skip_all => "Need 2 mountpoints to test";
 } else {
-        plan tests => 88;
+        plan tests => 94;
 }
 
-$result = NPTest->testCmd( 
-        "./check_disk -w 1% -c 1% -p $mountpoint_valid -w 1% -c 1% -p $mountpoint2_valid" 
+$result = NPTest->testCmd(
+        "./check_disk -w 1% -c 1% -p $mountpoint_valid -w 1% -c 1% -p $mountpoint2_valid"
         );
 cmp_ok( $result->return_code, "==", 0, "Checking two mountpoints (must have at least 1% free in space and inodes)");
 my $c = 0;
@@ -44,7 +44,7 @@ my @perf_data = sort(split(/ /, $result->perf_output));
 # Calculate avg_free free on mountpoint1 and mountpoint2
 # because if you check in the middle, you should get different errors
 $_ = $result->output;
-my ($free_on_mp1, $free_on_mp2) = (m/\((\d+)%.*\((\d+)%/);
+my ($free_on_mp1, $free_on_mp2) = (m/\((\d+\.\d+)%.*\((\d+\.\d+)%/);
 die "Cannot parse output: $_" unless ($free_on_mp1 && $free_on_mp2);
 my $avg_free = ceil(($free_on_mp1+$free_on_mp2)/2);
 my ($more_free, $less_free);
@@ -103,8 +103,8 @@ is ($crit_percth_data, int((1-10/100)*$total_percth_data), "Wrong critical in pe
 
 
 # Check when order of mount points are reversed, that perf data remains same
-$result = NPTest->testCmd( 
-        "./check_disk -w 1% -c 1% -p $mountpoint2_valid -w 1% -c 1% -p $mountpoint_valid" 
+$result = NPTest->testCmd(
+        "./check_disk -w 1% -c 1% -p $mountpoint2_valid -w 1% -c 1% -p $mountpoint_valid"
         );
 @_ = sort(split(/ /, $result->perf_output));
 is_deeply( \@perf_data, \@_, "perf data for both filesystems same when reversed");
@@ -119,8 +119,12 @@ like  ( $result->only_output, qr/$more_free/, "Have disk name in text");
 
 $result = NPTest->testCmd( "./check_disk -w 1 -c 1 -p $more_free -p $less_free" );
 cmp_ok( $result->return_code, '==', 0, "At least 1 MB available on $more_free and $less_free");
+
 $_ = $result->output;
+
 my ($free_mb_on_mp1, $free_mb_on_mp2) = (m/(\d+)MiB .* (\d+)MiB /g);
+die "Cannot parse output: $_" unless ($free_mb_on_mp1 && $free_mb_on_mp2);
+
 my $free_mb_on_all = $free_mb_on_mp1 + $free_mb_on_mp2;
 
 
@@ -134,8 +138,8 @@ cmp_ok( $result->return_code, '==', 0, "Old syntax okay" );
 $result = NPTest->testCmd( "./check_disk -w 1% -c 1% -p $more_free" );
 cmp_ok( $result->return_code, "==", 0, "At least 1% free" );
 
-$result = NPTest->testCmd( 
-        "./check_disk -w 1% -c 1% -p $more_free -w 100% -c 100% -p $less_free" 
+$result = NPTest->testCmd(
+        "./check_disk -w 1% -c 1% -p $more_free -w 100% -c 100% -p $less_free"
         );
 cmp_ok( $result->return_code, "==", 2, "Get critical on less_free mountpoint $less_free" );
 like( $result->output, $failureOutput, "Right output" );
@@ -151,14 +155,14 @@ $result = NPTest->testCmd(
         );
 cmp_ok( $result->return_code, '==', 0, "Get ok on more_free mountpoint, when checking avg_free");
 
-$result = NPTest->testCmd( 
-        "./check_disk -w $avg_free% -c 0% -p $less_free -w $avg_free% -c $avg_free% -p $more_free" 
+$result = NPTest->testCmd(
+        "./check_disk -w $avg_free% -c 0% -p $less_free -w $avg_free% -c $avg_free% -p $more_free"
         );
 cmp_ok( $result->return_code, "==", 1, "Combining above two tests, get warning");
 my $all_disks = $result->output;
 
 $result = NPTest->testCmd(
-        "./check_disk -e -w $avg_free% -c 0% -p $less_free -w $avg_free% -c $avg_free% -p $more_free" 
+        "./check_disk -e -w $avg_free% -c 0% -p $less_free -w $avg_free% -c $avg_free% -p $more_free"
         );
 isnt( $result->output, $all_disks, "-e gives different output");
 
@@ -240,7 +244,7 @@ TODO: {
         cmp_ok( $result->return_code, '==', 3, "Invalid command line options" );
 }
 
-$result = NPTest->testCmd( 
+$result = NPTest->testCmd(
         "./check_disk -p $mountpoint_valid -w 10% -c 15%"
         );
 cmp_ok( $result->return_code, "==", 3, "Invalid options: -p must come after thresholds" );
@@ -311,8 +315,8 @@ $result = NPTest->testCmd( "./check_disk -w 0% -c 0% -C -w 0% -c 0% -p $mountpoi
 like( $result->output, '/;.*;\|/', "-C selects partitions if -p is not given");
 
 # grouping: exit crit if the sum of free megs on mp1+mp2 is less than warn/crit
-$result = NPTest->testCmd( "./check_disk -w ". ($free_mb_on_all + 1) ." -c ". ($free_mb_on_all + 1) ."-g group -p $mountpoint_valid -p $mountpoint2_valid" );
-cmp_ok( $result->return_code, '==', 2, "grouping: exit crit if the sum of free megs on mp1+mp2 is less than warn/crit");
+$result = NPTest->testCmd( "./check_disk -w ". ($free_mb_on_all + 1) ." -c ". ($free_mb_on_all + 1) ." -g group -p $mountpoint_valid -p $mountpoint2_valid" );
+cmp_ok( $result->return_code, '==', 2, "grouping: exit crit if the sum of free megs on mp1+mp2 is less than warn/crit\nInstead received: " . $result->output);
 
 # grouping: exit warning if the sum of free megs on mp1+mp2 is between -w and -c
 $result = NPTest->testCmd( "./check_disk -w ". ($free_mb_on_all + 1) ." -c ". ($free_mb_on_all - 1) ." -g group -p $mountpoint_valid -p $mountpoint2_valid" );
@@ -322,7 +326,7 @@ cmp_ok( $result->return_code, '==', 1, "grouping: exit warning if the sum of fre
 $result = NPTest->testCmd( "./check_disk -w ". ($free_mb_on_all - 1) ." -c ". ($free_mb_on_all - 1) ." -g group -p $mountpoint_valid -p $mountpoint2_valid" );
 cmp_ok( $result->return_code, '==', 0, "grouping: exit ok if the sum of free megs on mp1+mp2 is more than warn/crit");
 
-# grouping: exit unknown if group name is given after -p 
+# grouping: exit unknown if group name is given after -p
 $result = NPTest->testCmd( "./check_disk -w ". ($free_mb_on_all - 1) ." -c ". ($free_mb_on_all - 1) ." -p $mountpoint_valid -g group -p $mountpoint2_valid" );
 cmp_ok( $result->return_code, '==', 3, "Invalid options: -p must come after groupname");
 
@@ -355,17 +359,17 @@ like( $result->output, qr/$mountpoint2_valid/,"ignore: output data does have $mo
 # ignore-missing: exit okay, when fs is not accessible
 $result = NPTest->testCmd( "./check_disk --ignore-missing -w 0% -c 0% -p /bob");
 cmp_ok( $result->return_code, '==', 0, "ignore-missing: return okay for not existing filesystem /bob");
-like( $result->output, '/^DISK OK - No disks were found for provided parameters; - ignored paths: /bob;.*$/', 'Output OK');
+like( $result->output, '/^DISK OK - No disks were found for provided parameters - ignored paths: /bob;.*$/', 'Output OK');
 
 # ignore-missing: exit okay, when regex does not match
 $result = NPTest->testCmd( "./check_disk --ignore-missing -w 0% -c 0% -r /bob");
 cmp_ok( $result->return_code, '==', 0, "ignore-missing: return okay for regular expression not matching");
-like( $result->output, '/^DISK OK - No disks were found for provided parameters;.*$/', 'Output OK');
+like( $result->output, '/^DISK OK - No disks were found for provided parameters.*$/', 'Output OK');
 
 # ignore-missing: exit okay, when fs with exact match (-E) is not found
 $result = NPTest->testCmd( "./check_disk --ignore-missing -w 0% -c 0% -E -p /etc");
 cmp_ok( $result->return_code, '==', 0, "ignore-missing: return okay when exact match does not find fs");
-like( $result->output, '/^DISK OK - No disks were found for provided parameters; - ignored paths: /etc;.*$/', 'Output OK');
+like( $result->output, '/^DISK OK - No disks were found for provided parameters - ignored paths: /etc;.*$/', 'Output OK');
 
 # ignore-missing: exit okay, when checking one existing fs and one non-existing fs (regex)
 $result = NPTest->testCmd( "./check_disk --ignore-missing -w 0% -c 0% -r '/bob' -r '^/\$'");
@@ -375,4 +379,19 @@ like( $result->output, '/^DISK OK - free space: \/ .*$/', 'Output OK');
 # ignore-missing: exit okay, when checking one existing fs and one non-existing fs (path)
 $result = NPTest->testCmd( "./check_disk --ignore-missing -w 0% -c 0% -p '/bob' -p '/'");
 cmp_ok( $result->return_code, '==', 0, "ignore-missing: return okay for regular expression not matching");
-like( $result->output, '/^DISK OK - free space: / .*; - ignored paths: /bob;.*$/', 'Output OK');
\ No newline at end of file
+like( $result->output, '/^DISK OK - free space: / .*; - ignored paths: /bob;.*$/', 'Output OK');
+
+# ignore-missing: exit okay, when checking one non-existing fs (path) and one ignored
+$result = NPTest->testCmd( "./check_disk -n -w 0% -c 0% -r /dummy -i /dummy2");
+cmp_ok( $result->return_code, '==', 0, "ignore-missing: return okay for regular expression not matching");
+like( $result->output, '/^DISK OK - No disks were found for provided parameters\|$/', 'Output OK');
+
+# ignore-missing: exit okay, when regex match does not find anything
+$result = NPTest->testCmd( "./check_disk -n -e -l -w 10% -c 5% -W 10% -K 5% -r /dummy");
+cmp_ok( $result->return_code, '==', 0, "ignore-missing: return okay for regular expression not matching");
+like( $result->output, '/^DISK OK\|$/', 'Output OK');
+
+# ignore-missing: exit okay, when regex match does not find anything
+$result = NPTest->testCmd( "./check_disk -n -l -w 10% -c 5% -W 10% -K 5% -r /dummy");
+cmp_ok( $result->return_code, '==', 0, "ignore-missing: return okay for regular expression not matching");
+like( $result->output, '/^DISK OK - No disks were found for provided parameters\|$/', 'Output OK');
diff --git a/plugins/t/check_http.t b/plugins/t/check_http.t
index 1f2fbdfd..6ab4a5b6 100644
--- a/plugins/t/check_http.t
+++ b/plugins/t/check_http.t
@@ -166,10 +166,10 @@ SKIP: {
         like  ( $res->output, '/time_connect=[\d\.]+/', 'Extended Performance Data Output OK' );
         like  ( $res->output, '/time_ssl=[\d\.]+/', 'Extended Performance Data SSL Output OK' );
 
-        $res = NPTest->testCmd( "./$plugin -H www.mozilla.com -u /firefox -f follow" );
+        $res = NPTest->testCmd( "./$plugin -H monitoring-plugins.org -u /download.html -f follow" );
         is( $res->return_code, 0, "Redirection based on location is okay");
 
-        $res = NPTest->testCmd( "./$plugin -H www.mozilla.com --extended-perfdata" );
+        $res = NPTest->testCmd( "./$plugin -H monitoring-plugins.org --extended-perfdata" );
         like  ( $res->output, '/time_connect=[\d\.]+/', 'Extended Performance Data Output OK' );
 }
 
diff --git a/plugins/t/check_imap.t b/plugins/t/check_imap.t
index 7c74e564..cf2f81c8 100644
--- a/plugins/t/check_imap.t
+++ b/plugins/t/check_imap.t
@@ -25,7 +25,7 @@ $t = NPTest->testCmd( "./check_imap $host_tcp_imap -p 143 -wt 9 -ct 9 -to 10 -e
 cmp_ok( $t->return_code, '==', 0, "Check old parameter options" );
 
 $t = NPTest->testCmd( "./check_imap $host_nonresponsive" );
-cmp_ok( $t->return_code, '==', 2, "Get error with non reponsive host" );
+cmp_ok( $t->return_code, '==', 2, "Get error with non responsive host" );
 
 $t = NPTest->testCmd( "./check_imap $hostname_invalid" );
 cmp_ok( $t->return_code, '==', 2, "Invalid hostname" );
diff --git a/plugins/t/check_ssh.t b/plugins/t/check_ssh.t
index a5cd23ce..907d33a8 100644
--- a/plugins/t/check_ssh.t
+++ b/plugins/t/check_ssh.t
@@ -8,34 +8,116 @@ use strict;
 use Test::More;
 use NPTest;
 
+my $res;
+
 # Required parameters
-my $ssh_host           = getTestParameter("NP_SSH_HOST", "A host providing SSH service", "localhost");
-my $host_nonresponsive = getTestParameter("NP_HOST_NONRESPONSIVE", "The hostname of system not responsive to network requests", "10.0.0.1" );
-my $hostname_invalid   = getTestParameter("NP_HOSTNAME_INVALID", "An invalid (not known to DNS) hostname", "nosuchhost" );
+my $ssh_host           = getTestParameter("NP_SSH_HOST",
+                                          "A host providing SSH service",
+                                          "localhost");
+
+my $host_nonresponsive = getTestParameter("NP_HOST_NONRESPONSIVE",
+                                          "The hostname of system not responsive to network requests",
+                                          "10.0.0.1" );
+
+my $hostname_invalid   = getTestParameter("NP_HOSTNAME_INVALID",
+                                          "An invalid (not known to DNS) hostname",
+                                          "nosuchhost" );
+
+
+plan tests => 14 + 6;
+
+SKIP: {
+        skip "SSH_HOST must be defined", 6 unless $ssh_host;
+        my $result = NPTest->testCmd(
+                "./check_ssh -H $ssh_host"
+                );
+        cmp_ok($result->return_code, '==', 0, "Exit with return code 0 (OK)");
+        like($result->output, '/^SSH OK - /', "Status text if command returned none (OK)");
+
+
+        $result = NPTest->testCmd(
+                "./check_ssh -H $host_nonresponsive -t 2"
+                );
+        cmp_ok($result->return_code, '==', 2, "Exit with return code 0 (OK)");
+        like($result->output, '/^CRITICAL - Socket timeout after 2 seconds/', "Status text if command returned none (OK)");
+
+
+
+        $result = NPTest->testCmd(
+                "./check_ssh -H $hostname_invalid -t 2"
+                );
+        cmp_ok($result->return_code, '==', 3, "Exit with return code 0 (OK)");
+        like($result->output, '/^check_ssh: Invalid hostname/', "Status text if command returned none (OK)");
+
 
+}
+SKIP: {
 
-plan skip_all => "SSH_HOST must be defined" unless $ssh_host;
-plan tests    => 6;
+        skip "No netcat available", 14 unless (system("which nc > /dev/null") == 0);
 
+        # netcat on linux (on debian) will just keep the socket open if not advised otherwise
+        # therefore we add -q to close it after two seconds after receiving the EOF from input
+        my $nc_flags = "-l 5003 -N";
+        #A valid protocol version control string has the form
+        #       SSH-protoversion-softwareversion SP comments CR LF
+        #
+        # where `comments` is optional, protoversion is the SSH protocol version and
+        # softwareversion is an arbitrary string representing the server software version
+        open(NC, "echo 'SSH-2.0-nagiosplug.ssh.0.1' | nc ${nc_flags}|");
+        sleep 0.1;
+        $res = NPTest->testCmd( "./check_ssh -H localhost -p 5003" );
+        cmp_ok( $res->return_code, '==', 0, "Got SSH protocol version control string");
+        like( $res->output, '/^SSH OK - nagiosplug.ssh.0.1 \(protocol 2.0\)/', "Output OK");
+        close NC;
 
-my $result = NPTest->testCmd(
-    "./check_ssh -H $ssh_host"
-    );
-cmp_ok($result->return_code, '==', 0, "Exit with return code 0 (OK)");
-like($result->output, '/^SSH OK - /', "Status text if command returned none (OK)");
+        open(NC, "echo 'SSH-2.0-3.2.9.1' | nc ${nc_flags}|");
+        sleep 0.1;
+        $res = NPTest->testCmd( "./check_ssh -H localhost -p 5003" );
+        cmp_ok( $res->return_code, "==", 0, "Got SSH protocol version control string with non-alpha softwareversion string");
+        like( $res->output, '/^SSH OK - 3.2.9.1 \(protocol 2.0\)/', "Output OK for non-alpha softwareversion string");
+        close NC;
 
+        open(NC, "echo 'SSH-2.0-nagiosplug.ssh.0.1 this is a comment' | nc ${nc_flags} |");
+        sleep 0.1;
+        $res = NPTest->testCmd( "./check_ssh -H localhost -p 5003 -r nagiosplug.ssh.0.1" );
+        cmp_ok( $res->return_code, '==', 0, "Got SSH protocol version control string, and parsed comment appropriately");
+        like( $res->output, '/^SSH OK - nagiosplug.ssh.0.1 \(protocol 2.0\)/', "Output OK");
+        close NC;
 
-$result = NPTest->testCmd(
-    "./check_ssh -H $host_nonresponsive -t 2"
-    );
-cmp_ok($result->return_code, '==', 2, "Exit with return code 0 (OK)");
-like($result->output, '/^CRITICAL - Socket timeout after 2 seconds/', "Status text if command returned none (OK)");
+        open(NC, "echo 'SSH-' | nc ${nc_flags}|");
+        sleep 0.1;
+        $res = NPTest->testCmd( "./check_ssh -H localhost -p 5003" );
+        cmp_ok( $res->return_code, '==', 2, "Got invalid SSH protocol version control string");
+        like( $res->output, '/^SSH CRITICAL/', "Output OK");
+        close NC;
 
+        open(NC, "echo '' | nc ${nc_flags}|");
+        sleep 0.1;
+        $res = NPTest->testCmd( "./check_ssh -H localhost -p 5003" );
+        cmp_ok( $res->return_code, '==', 2, "No version control string received");
+        like( $res->output, '/^SSH CRITICAL - No version control string received/', "Output OK");
+        close NC;
 
+        open(NC, "echo 'Not a version control string' | nc ${nc_flags}|");
+        sleep 0.1;
+        $res = NPTest->testCmd( "./check_ssh -H localhost -p 5003" );
+        cmp_ok( $res->return_code, '==', 2, "No version control string received");
+        like( $res->output, '/^SSH CRITICAL - No version control string received/', "Output OK");
+        close NC;
 
-$result = NPTest->testCmd(
-    "./check_ssh -H $hostname_invalid -t 2"
-    );
-cmp_ok($result->return_code, '==', 3, "Exit with return code 0 (OK)");
-like($result->output, '/^check_ssh: Invalid hostname/', "Status text if command returned none (OK)");
 
+        #RFC 4253 permits servers to send any number of data lines prior to sending the protocol version control string
+        open(NC, "{ echo 'AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA'; sleep 0.5;
+                echo 'BBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBB'; sleep 0.5;
+                echo 'CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC'; sleep 0.2;
+                echo 'DDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDD'; sleep 0.3;
+                printf 'EEEEEEEEEEEEEEEEEE'; sleep 0.2;
+                printf 'EEEEEEEEEEEEEEEEEE\n'; sleep 0.2;
+                echo 'Some\nPrepended\nData\nLines\n'; sleep 0.2;
+                echo 'SSH-2.0-nagiosplug.ssh.0.2';} | nc ${nc_flags}|");
+        sleep 0.1;
+        $res = NPTest->testCmd( "./check_ssh -H localhost -p 5003" );
+        cmp_ok( $res->return_code, '==', 0, "Got delayed SSH protocol version control string");
+        like( $res->output, '/^SSH OK - nagiosplug.ssh.0.2 \(protocol 2.0\)/', "Output OK");
+        close NC;
+}
diff --git a/plugins/t/check_swap.t b/plugins/t/check_swap.t
index de9e0f05..18780386 100644
--- a/plugins/t/check_swap.t
+++ b/plugins/t/check_swap.t
@@ -5,7 +5,7 @@
 #
 
 use strict;
-use Test::More tests => 8;
+use Test::More tests => 14;
 use NPTest;
 
 my $successOutput = '/^SWAP OK - [0-9]+\% free \([0-9]+MB out of [0-9]+MB\)/';
@@ -14,6 +14,10 @@ my $warnOutput    = '/^SWAP WARNING - [0-9]+\% free \([0-9]+MB out of [0-9]+MB\)
 
 my $result;
 
+$result = NPTest->testCmd( "./check_swap" );                                    # Always OK
+cmp_ok( $result->return_code, "==", 0, "Always OK" );
+like( $result->output, $successOutput, "Right output" );
+
 $result = NPTest->testCmd( "./check_swap -w 1048576 -c 1048576" );              # 1 MB free
 cmp_ok( $result->return_code, "==", 0, "At least 1MB free" );
 like( $result->output, $successOutput, "Right output" );
@@ -29,3 +33,11 @@ like( $result->output, $failureOutput, "Right output" );
 $result = NPTest->testCmd( "./check_swap -w 100% -c 1%" );                      # 100% (always warn)
 cmp_ok( $result->return_code, "==", 1, 'Get warning because not 100% free' );
 like( $result->output, $warnOutput, "Right output" );
+
+$result = NPTest->testCmd( "./check_swap -w 100%" );                            # 100% (single threshold, always warn)
+cmp_ok( $result->return_code, "==", 1, 'Get warning because not 100% free' );
+like( $result->output, $warnOutput, "Right output" );
+
+$result = NPTest->testCmd( "./check_swap -c 100%" );                            # 100% (single threshold, always critical)
+cmp_ok( $result->return_code, "==", 2, 'Get critical because not 100% free' );
+like( $result->output, $failureOutput, "Right output" );
diff --git a/plugins/t/check_users.t b/plugins/t/check_users.t
index 088f3b52..21c3e53d 100644
--- a/plugins/t/check_users.t
+++ b/plugins/t/check_users.t
@@ -2,7 +2,7 @@
 #
 # Logged in Users Tests via check_users
 #
-# Trick: This ckeck requires at least 1 user logged in. These commands should
+# Trick: This check requires at least 1 user logged in. These commands should
 #        leave a session open forever in the background:
 #
 #   $ ssh -tt localhost </dev/null >/dev/null 2>/dev/null &
@@ -13,10 +13,11 @@ use Test;
 use NPTest;
 
 use vars qw($tests);
-BEGIN {$tests = 8; plan tests => $tests}
+BEGIN {$tests = 12; plan tests => $tests}
 
 my $successOutput = '/^USERS OK - [0-9]+ users currently logged in/';
 my $failureOutput = '/^USERS CRITICAL - [0-9]+ users currently logged in/';
+my $wrongOptionOutput = '/Usage:/';
 
 my $t;
 
@@ -24,6 +25,8 @@ $t += checkCmd( "./check_users 1000 1000", 0, $successOutput );
 $t += checkCmd( "./check_users    0    0", 2, $failureOutput );
 $t += checkCmd( "./check_users -w 0:1000 -c 0:1000", 0, $successOutput );
 $t += checkCmd( "./check_users -w 0:0 -c 0:0", 2, $failureOutput );
+$t += checkCmd( "./check_users -w 0:1000", 3, $wrongOptionOutput);
+$t += checkCmd( "./check_users", 3, $wrongOptionOutput);
 
 exit(0) if defined($Test::Harness::VERSION);
 exit($tests - $t);
diff --git a/plugins/tests/check_curl.t b/plugins/tests/check_curl.t
index 72f2b7c2..eaa9f518 100755
--- a/plugins/tests/check_curl.t
+++ b/plugins/tests/check_curl.t
@@ -9,7 +9,7 @@
 # Country Name (2 letter code) [AU]:DE
 # State or Province Name (full name) [Some-State]:Bavaria
 # Locality Name (eg, city) []:Munich
-# Organization Name (eg, company) [Internet Widgits Pty Ltd]:Monitoring Plugins
+# Organization Name (eg, company) [Internet Widgets Pty Ltd]:Monitoring Plugins
 # Organizational Unit Name (eg, section) []:
 # Common Name (e.g. server FQDN or YOUR name) []:Monitoring Plugins
 # Email Address []:devel@monitoring-plugins.org
@@ -21,7 +21,7 @@ use FindBin qw($Bin);
 
 $ENV{'LC_TIME'} = "C";
 
-my $common_tests = 73;
+my $common_tests = 75;
 my $ssl_only_tests = 8;
 # Check that all dependent modules are available
 eval "use HTTP::Daemon 6.01;";
@@ -178,6 +178,11 @@ sub run_server {
                                 $c->send_basic_header;
                                 $c->send_crlf;
                                 $c->send_response(HTTP::Response->new( 200, 'OK', undef, 'redirected' ));
+                        } elsif ($r->url->path eq "/redirect_rel") {
+                                $c->send_basic_header(302);
+                                $c->send_header("Location", "/redirect2" );
+                                $c->send_crlf;
+                                $c->send_response('moved to /redirect2');
                         } elsif ($r->url->path eq "/redir_timeout") {
                                 $c->send_redirect( "/timeout" );
                         } elsif ($r->url->path eq "/timeout") {
@@ -471,9 +476,12 @@ sub run_common_tests {
         is( $result->return_code, 0, $cmd);
         like( $result->output, '/^HTTP OK: HTTP/1.1 200 OK - \d+ bytes in [\d\.]+ second/', "Output correct: ".$result->output );
 
-  # These tests may block
-        print "ALRM\n";
+        $cmd = "$command -f follow -u /redirect_rel -s redirected";
+        $result = NPTest->testCmd( $cmd );
+        is( $result->return_code, 0, $cmd);
+        like( $result->output, '/^HTTP OK: HTTP/1.1 200 OK - \d+ bytes in [\d\.]+ second/', "Output correct: ".$result->output );
 
+        # These tests may block
         # stickyport - on full urlS port is set back to 80 otherwise
         $cmd = "$command -f stickyport -u /redir_external -t 5 -s redirected";
         eval {
diff --git a/plugins/tests/check_http.t b/plugins/tests/check_http.t
index 6078b274..6eaf85b2 100755
--- a/plugins/tests/check_http.t
+++ b/plugins/tests/check_http.t
@@ -13,7 +13,7 @@ use IO::Socket::INET;
 
 $ENV{'LC_TIME'} = "C";
 
-my $common_tests = 71;
+my $common_tests = 73;
 my $virtual_port_tests = 8;
 my $ssl_only_tests = 12;
 my $chunked_encoding_special_tests = 1;
@@ -199,6 +199,11 @@ sub run_server {
                                         $c->send_basic_header;
                                         $c->send_crlf;
                                         $c->send_response(HTTP::Response->new( 200, 'OK', undef, 'redirected' ));
+                        } elsif ($r->url->path eq "/redirect_rel") {
+                                $c->send_basic_header(302);
+                                $c->send_header("Location", "/redirect2" );
+                                $c->send_crlf;
+                                $c->send_response('moved to /redirect2');
                                 } elsif ($r->url->path eq "/redir_timeout") {
                                         $c->send_redirect( "/timeout" );
                                 } elsif ($r->url->path eq "/timeout") {
@@ -515,6 +520,11 @@ sub run_common_tests {
         is( $result->return_code, 0, $cmd);
         like( $result->output, '/^HTTP OK: HTTP/1.1 200 OK - \d+ bytes in [\d\.]+ second/', "Output correct: ".$result->output );
 
+        $cmd = "$command -f follow -u /redirect_rel -s redirected";
+        $result = NPTest->testCmd( $cmd );
+        is( $result->return_code, 0, $cmd);
+        like( $result->output, '/^HTTP OK: HTTP/1.1 200 OK - \d+ bytes in [\d\.]+ second/', "Output correct: ".$result->output );
+
   # These tests may block
         print "ALRM\n";
 
diff --git a/plugins/utils.c b/plugins/utils.c
index b4214c61..77d6a6f9 100644
--- a/plugins/utils.c
+++ b/plugins/utils.c
@@ -23,13 +23,15 @@
 *****************************************************************************/
 
 #include "common.h"
-#include "utils.h"
+#include "./utils.h"
 #include "utils_base.h"
 #include <stdarg.h>
 #include <limits.h>
 #include <string.h>
 #include <errno.h>
 
+#include <stdbool.h>
+
 #include <arpa/inet.h>
 
 extern void print_usage (void);
@@ -147,98 +149,107 @@ print_revision (const char *command_name, const char *revision)
                  command_name, revision, PACKAGE, VERSION);
 }
 
-int
-is_numeric (char *number)
-{
+bool is_numeric (char *number) {
         char tmp[1];
         float x;
 
         if (!number)
-                return FALSE;
+                return false;
         else if (sscanf (number, "%f%c", &x, tmp) == 1)
-                return TRUE;
+                return true;
         else
-                return FALSE;
+                return false;
 }
 
-int
-is_positive (char *number)
-{
+bool is_positive (char *number) {
         if (is_numeric (number) && atof (number) > 0.0)
-                return TRUE;
+                return true;
         else
-                return FALSE;
+                return false;
 }
 
-int
-is_negative (char *number)
-{
+bool is_negative (char *number) {
         if (is_numeric (number) && atof (number) < 0.0)
-                return TRUE;
+                return true;
         else
-                return FALSE;
+                return false;
 }
 
-int
-is_nonnegative (char *number)
-{
+bool is_nonnegative (char *number) {
         if (is_numeric (number) && atof (number) >= 0.0)
-                return TRUE;
+                return true;
         else
-                return FALSE;
+                return false;
 }
 
-int
-is_percentage (char *number)
-{
+bool is_percentage (char *number) {
         int x;
         if (is_numeric (number) && (x = atof (number)) >= 0 && x <= 100)
-                return TRUE;
+                return true;
         else
-                return FALSE;
+                return false;
 }
 
-int
-is_integer (char *number)
-{
+bool is_percentage_expression (const char str[]) {
+        if (!str) {
+                return false;
+        }
+
+        size_t len = strlen(str);
+
+        if (str[len-1] != '%') {
+                return false;
+        }
+
+        char *foo = calloc(sizeof(char), len + 1);
+
+        if (!foo) {
+                die (STATE_UNKNOWN, _("calloc failed \n"));
+        }
+
+        strcpy(foo, str);
+        foo[len-1] = '\0';
+
+        bool result = is_numeric(foo);
+
+        free(foo);
+
+        return result;
+}
+
+bool is_integer (char *number) {
         long int n;
 
         if (!number || (strspn (number, "-0123456789 ") != strlen (number)))
-                return FALSE;
+                return false;
 
         n = strtol (number, NULL, 10);
 
         if (errno != ERANGE && n >= INT_MIN && n <= INT_MAX)
-                return TRUE;
+                return true;
         else
-                return FALSE;
+                return false;
 }
 
-int
-is_intpos (char *number)
-{
+bool is_intpos (char *number) {
         if (is_integer (number) && atoi (number) > 0)
-                return TRUE;
+                return true;
         else
-                return FALSE;
+                return false;
 }
 
-int
-is_intneg (char *number)
-{
+bool is_intneg (char *number) {
         if (is_integer (number) && atoi (number) < 0)
-                return TRUE;
+                return true;
         else
-                return FALSE;
+                return false;
 }
 
-int
-is_intnonneg (char *number)
-{
+bool is_intnonneg (char *number) {
         if (is_integer (number) && atoi (number) >= 0)
-                return TRUE;
+                return true;
         else
-                return FALSE;
+                return false;
 }
 
 /*
@@ -246,19 +257,27 @@ is_intnonneg (char *number)
  * On success the number will be written to the _target_ address, if _target_ is not set
  * to NULL.
  */
-int is_int64(char *number, int64_t *target) {
+bool is_int64(char *number, int64_t *target) {
         errno = 0;
-        uint64_t tmp = strtoll(number, NULL, 10);
+        char *endptr = { 0 };
+
+        int64_t tmp = strtoll(number, &endptr, 10);
         if (errno != 0) {
+                return false;
+        }
+
+        if (*endptr == '\0') {
                 return 0;
         }
+
         if (tmp < INT64_MIN || tmp > INT64_MAX) {
-                return 0;
+                return false;
         }
+
         if (target != NULL) {
                 *target = tmp;
         }
-        return 1;
+        return true;
 }
 
 /*
@@ -266,40 +285,45 @@ int is_int64(char *number, int64_t *target) {
  * On success the number will be written to the _target_ address, if _target_ is not set
  * to NULL.
  */
-int is_uint64(char *number, uint64_t *target) {
+bool is_uint64(char *number, uint64_t *target) {
         errno = 0;
-        uint64_t tmp = strtoll(number, NULL, 10);
+        char *endptr = { 0 };
+        unsigned long long tmp = strtoull(number, &endptr, 10);
+
         if (errno != 0) {
-                return 0;
+                return false;
         }
-        if (tmp < 0 || tmp > UINT64_MAX) {
-                return 0;
+
+        if (*endptr != '\0') {
+                return false;
+        }
+
+        if (tmp > UINT64_MAX) {
+                return false;
         }
+
         if (target != NULL) {
-                *target = tmp;
+                *target = (uint64_t)tmp;
         }
-        return 1;
+
+        return true;
 }
 
-int
-is_intpercent (char *number)
-{
+bool is_intpercent (char *number) {
         int i;
         if (is_integer (number) && (i = atoi (number)) >= 0 && i <= 100)
-                return TRUE;
+                return true;
         else
-                return FALSE;
+                return false;
 }
 
-int
-is_option (char *str)
-{
+bool is_option (char *str) {
         if (!str)
-                return FALSE;
+                return false;
         else if (strspn (str, "-") == 1 || strspn (str, "-") == 2)
-                return TRUE;
+                return true;
         else
-                return FALSE;
+                return false;
 }
 
 #ifdef NEED_GETTIMEOFDAY
@@ -804,19 +828,3 @@ char *sperfdata_int (const char *label,
 
         return data;
 }
-
-int
-open_max (void)
-{
-        errno = 0;
-        if (maxfd > 0)
-                return(maxfd);
-
-        if ((maxfd = sysconf (_SC_OPEN_MAX)) < 0) {
-                if (errno == 0)
-                        maxfd = DEFAULT_MAXFD;   /* it's indeterminate */
-        else
-                die (STATE_UNKNOWN, _("sysconf error for _SC_OPEN_MAX\n"));
-        }
-        return(maxfd);
-}
diff --git a/plugins/utils.h b/plugins/utils.h
index c76b3216..f939e337 100644
--- a/plugins/utils.h
+++ b/plugins/utils.h
@@ -16,6 +16,8 @@ suite of plugins. */
 /* now some functions etc are being defined in ../lib/utils_base.c */
 #include "utils_base.h"
 
+#include <stdbool.h>
+
 
 #ifdef NP_EXTRA_OPTS
 /* Include extra-opts functions if compiled in */
@@ -34,21 +36,22 @@ extern time_t start_time, end_time;
 
 /* Test input types */
 
-int is_integer (char *);
-int is_intpos (char *);
-int is_intneg (char *);
-int is_intnonneg (char *);
-int is_intpercent (char *);
-int is_uint64(char *number, uint64_t *target);
-int is_int64(char *number, int64_t *target);
+bool is_integer (char *);
+bool is_intpos (char *);
+bool is_intneg (char *);
+bool is_intnonneg (char *);
+bool is_intpercent (char *);
+bool is_uint64(char *number, uint64_t *target);
+bool is_int64(char *number, int64_t *target);
 
-int is_numeric (char *);
-int is_positive (char *);
-int is_negative (char *);
-int is_nonnegative (char *);
-int is_percentage (char *);
+bool is_numeric (char *);
+bool is_positive (char *);
+bool is_negative (char *);
+bool is_nonnegative (char *);
+bool is_percentage (char *);
+bool is_percentage_expression (const char[]);
 
-int is_option (char *);
+bool is_option (char *);
 
 /* Generalized timer that will do milliseconds if available */
 #ifndef HAVE_STRUCT_TIMEVAL
@@ -106,8 +109,6 @@ char *sperfdata (const char *, double, const char *, char *, char *,
 char *sperfdata_int (const char *, int, const char *, char *, char *,
                      int, int, int, int);
 
-int open_max (void);
-
 /* The idea here is that, although not every plugin will use all of these, 
    most will or should.  Therefore, for consistency, these very common 
    options should have only these meanings throughout the overall suite */