check_tcp code cleanup from andreas plus fix to andreas' patch from sean

git-svn-id: https://nagiosplug.svn.sourceforge.net/svnroot/nagiosplug/nagiosplug/trunk@1189 f882894a-f735-0410-b71e-b25c423dba1c

1 files changed, 242 insertions, 276 deletions

diff --git a/plugins/check_tcp.c b/plugins/check_tcp.c
index 3087453..ad8b042 100644
--- a/plugins/check_tcp.c
+++ b/plugins/check_tcp.c
@@ -47,240 +47,206 @@ const char *email = "nagiosplug-devel@lists.sourceforge.net";
 #endif
 
 #ifdef HAVE_SSL
-int check_cert = FALSE;
-int days_till_exp;
-char *randbuff = "";
-SSL_CTX *ctx;
-SSL *ssl;
-X509 *server_cert;
-int connect_SSL (void);
-int check_certificate (X509 **);
+static int check_cert = FALSE;
+static int days_till_exp;
+static char *randbuff = "";
+static SSL_CTX *ctx;
+static SSL *ssl;
+static X509 *server_cert;
+static int connect_SSL (void);
+static int check_certificate (X509 **);
+# define my_recv(buf, len) ((flags & FLAG_SSL) ? SSL_read(ssl, buf, len) : read(sd, buf, len))
+#else
+# define my_recv(buf, len) read(sd, buf, len)
 #endif
 
-#define MAXBUF 1024
 
-int process_arguments (int, char **);
-int my_recv (void);
+/* int my_recv(char *, size_t); */
+static int process_arguments (int, char **);
 void print_help (void);
 void print_usage (void);
 
-char *SERVICE = NULL;
-char *SEND = NULL;
-char *EXPECT = NULL;
-char *QUIT = NULL;
-int PROTOCOL = 0;
-int PORT = 0;
-
-char timestamp[17] = "";
-int server_port = 0;
-char *server_address = NULL;
-char *server_send = NULL;
-char *server_quit = NULL;
-char **server_expect = NULL;
-size_t server_expect_count = 0;
-int maxbytes = 0;
-char **warn_codes = NULL;
-size_t warn_codes_count = 0;
-char **crit_codes = NULL;
-size_t crit_codes_count = 0;
-unsigned int delay = 0;
-double warning_time = 0;
-int check_warning_time = FALSE;
-double critical_time = 0;
-int check_critical_time = FALSE;
-int hide_output = FALSE;
-double elapsed_time = 0;
-long microsec;
-int verbose = FALSE;
-int use_ssl = FALSE;
-int sd = 0;
-char *buffer;
-int expect_mismatch_state = STATE_WARNING;
-int exact_matching = TRUE;
+#define EXPECT server_expect[0]
+static char *SERVICE = "TCP";
+static char *SEND = NULL;
+static char *QUIT = NULL;
+static int PROTOCOL = IPPROTO_TCP; /* most common is default */
+static int PORT = 0;
+
+static char timestamp[17] = "";
+static int server_port = 0;
+static char *server_address = NULL;
+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 char **warn_codes = NULL;
+static size_t warn_codes_count = 0;
+static char **crit_codes = NULL;
+static size_t crit_codes_count = 0;
+static unsigned int delay = 0;
+static double warning_time = 0;
+static double critical_time = 0;
+static double elapsed_time = 0;
+static long microsec;
+static int sd = 0;
+#define MAXBUF 1024
+static char buffer[MAXBUF];
+static int expect_mismatch_state = STATE_WARNING;
+
+#define FLAG_SSL 0x01
+#define FLAG_VERBOSE 0x02
+#define FLAG_EXACT_MATCH 0x04
+#define FLAG_TIME_WARN 0x08
+#define FLAG_TIME_CRIT 0x10
+#define FLAG_HIDE_OUTPUT 0x20
+static size_t flags = FLAG_EXACT_MATCH;
 
 int
 main (int argc, char **argv)
 {
         int result = STATE_UNKNOWN;
         int i;
-        char *status;
+        char *status = NULL;
         struct timeval tv;
+        size_t len, match = -1;
 
         setlocale (LC_ALL, "");
         bindtextdomain (PACKAGE, LOCALEDIR);
         textdomain (PACKAGE);
 
-        if (strstr (argv[0], "check_udp")) {
-                progname = strdup ("check_udp");
-                SERVICE = strdup ("UDP");
-                SEND = NULL;
-                EXPECT = NULL;
-                QUIT = NULL;
-                PROTOCOL = IPPROTO_UDP;
-                PORT = 0;
+        /* determine program- and service-name quickly */
+        progname = strrchr(argv[0], '/');
+        if(progname != NULL) progname++;
+        else progname = argv[0];
+
+        len = strlen(progname);
+        if(len > 6 && !memcmp(progname, "check_", 6)) {
+                SERVICE = progname + 6;
+                for(i = 0; i < len - 6; i++)
+                        SERVICE[i] = toupper(SERVICE[i]);
         }
-        else if (strstr (argv[0], "check_tcp")) {
-                progname = strdup ("check_tcp");
-                SERVICE = strdup ("TCP");
-                SEND = NULL;
-                EXPECT = NULL;
-                QUIT = NULL;
-                PROTOCOL = IPPROTO_TCP;
-                PORT = 0;
+
+        /* set up a resonable buffer at first (will be realloc()'ed if
+         * user specifies other options) */
+        server_expect = calloc(sizeof(char *), 2);
+
+        /* determine defaults for this service's protocol */
+        if (!strncmp(SERVICE, "UDP", 3)) {
+                PROTOCOL = IPPROTO_UDP;
         }
-        else if (strstr (argv[0], "check_ftp")) {
-                progname = strdup ("check_ftp");
-                SERVICE = strdup ("FTP");
-                SEND = NULL;
-                EXPECT = strdup ("220");
-                QUIT = strdup ("QUIT\r\n");
-                PROTOCOL = IPPROTO_TCP;
+        else if (!strncmp(SERVICE, "FTP", 3)) {
+                EXPECT = "220";
+                QUIT = "QUIT\r\n";
                 PORT = 21;
         }
-        else if (strstr (argv[0], "check_smtp")) {
-                progname = strdup ("check_smtp");
-                SERVICE = strdup ("SMTP");
-                SEND = NULL;
-                EXPECT = strdup ("220");
-                QUIT = strdup ("QUIT\r\n");
-                PROTOCOL = IPPROTO_TCP;
-                PORT = 25;
-        }
-        else if (strstr (argv[0], "check_pop")) {
-                progname = strdup ("check_pop");
-                SERVICE = strdup ("POP");
-                SEND = NULL;
-                EXPECT = strdup ("+OK");
-                QUIT = strdup ("QUIT\r\n");
-                PROTOCOL = IPPROTO_TCP;
+        else if (!strncmp(SERVICE, "POP", 3) || !strncmp(SERVICE, "POP3", 4)) {
+                EXPECT = "+OK";
+                QUIT = "QUIT\r\n";
                 PORT = 110;
         }
-        else if (strstr (argv[0], "check_imap")) {
-                progname = strdup ("check_imap");
-                SERVICE = strdup ("IMAP");
-                SEND = NULL;
-                EXPECT = strdup ("* OK");
-                QUIT = strdup ("a1 LOGOUT\r\n");
-                PROTOCOL = IPPROTO_TCP;
+        else if (!strncmp(SERVICE, "SMTP", 4)) {
+                EXPECT = "220";
+                QUIT = "QUIT\r\n";
+                PORT = 25;
+        }
+        else if (!strncmp(SERVICE, "IMAP", 4)) {
+                EXPECT = "* OK";
+                QUIT = "a1 LOGOUT\r\n";
                 PORT = 143;
         }
 #ifdef HAVE_SSL
-        else if (strstr(argv[0],"check_simap")) {
-                progname = strdup ("check_simap");
-                SERVICE = strdup ("SIMAP");
-                SEND=NULL;
-                EXPECT = strdup ("* OK");
-                QUIT = strdup ("a1 LOGOUT\r\n");
-                PROTOCOL=IPPROTO_TCP;
-                use_ssl=TRUE;
-                PORT=993;
+        else if (!strncmp(SERVICE, "SIMAP", 5)) {
+                EXPECT = "* OK";
+                QUIT = "a1 LOGOUT\r\n";
+                flags |= FLAG_SSL;
+                PORT = 993;
         }
-        else if (strstr(argv[0],"check_spop")) {
-                progname = strdup ("check_spop");
-                SERVICE = strdup ("SPOP");
-                SEND=NULL;
-                EXPECT = strdup ("+OK");
-                QUIT = strdup ("QUIT\r\n");
-                PROTOCOL=IPPROTO_TCP;
-                use_ssl=TRUE;
-                PORT=995;
+        else if (!strncmp(SERVICE, "SPOP", 4)) {
+                EXPECT = "+OK";
+                QUIT = "QUIT\r\n";
+                flags |= FLAG_SSL;
+                PORT = 995;
         }
-        else if (strstr(argv[0],"check_ssmtp")) {
-                progname = strdup ("check_ssmtp");
-                SERVICE = strdup ("SSMTP");
-                SEND=NULL;
-                EXPECT = strdup ("220");
-                QUIT = strdup ("QUIT\r\n");
-                PROTOCOL=IPPROTO_TCP;
-                use_ssl=TRUE;
-                PORT=465;
+        else if (!strncmp(SERVICE, "SSMTP", 5)) {
+                EXPECT = "220";
+                QUIT = "QUIT\r\n";
+                flags |= FLAG_SSL;
+                PORT = 465;
         }
-        else if (strstr(argv[0],"check_jabber")) {
-                progname = strdup("check_jabber");
-                SERVICE = strdup("JABBER");
-                SEND = strdup("<stream:stream to=\'host\' xmlns=\'jabber:client\' xmlns:stream=\'http://etherx.jabber.org/streams\'>\n");
-                EXPECT = strdup("<?xml version=\'1.0\'?><stream:stream xmlns:stream=\'http://etherx.jabber.org/streams\'");
-                QUIT = strdup("</stream:stream>\n");
-                PROTOCOL=IPPROTO_TCP;
-                use_ssl=TRUE;
+        else if (!strncmp(SERVICE, "JABBER", 6)) {
+                SEND = "<stream:stream to=\'host\' xmlns=\'jabber:client\' xmlns:stream=\'http://etherx.jabber.org/streams\'>\n";
+                EXPECT = "<?xml version=\'1.0\'?><stream:stream xmlns:stream=\'http://etherx.jabber.org/streams\'";
+                QUIT = "</stream:stream>\n";
+                flags |= FLAG_SSL | FLAG_HIDE_OUTPUT;
                 PORT = 5222;
         }
-       else if (strstr (argv[0], "check_nntps")) {
-                progname = strdup("check_nntps");
-                SERVICE = strdup("NNTPS");
-                SEND = NULL;
-                EXPECT = NULL;
-                server_expect = realloc (server_expect, ++server_expect_count);
-                asprintf (&server_expect[server_expect_count - 1], "200");
-                server_expect = realloc (server_expect, ++server_expect_count);
-                asprintf (&server_expect[server_expect_count - 1], "201");
-                QUIT = strdup("QUIT\r\n");
-                PROTOCOL = IPPROTO_TCP;
-                use_ssl=TRUE;
+        else if (!strncmp (SERVICE, "NNTPS", 5)) {
+                server_expect_count = 2;
+                server_expect[0] = "200";
+                server_expect[1] = "201";
+                QUIT = "QUIT\r\n";
+                flags |= FLAG_SSL;
                 PORT = 563;
-}
-
+        }
 #endif
-        else if (strstr (argv[0], "check_nntp")) {
-                progname = strdup ("check_nntp");
-                SERVICE = strdup ("NNTP");
-                SEND = NULL;
-                EXPECT = NULL;
-                server_expect = realloc (server_expect, sizeof (char *) * (++server_expect_count));
-                asprintf (&server_expect[server_expect_count - 1], "200");
-                server_expect = realloc (server_expect, sizeof (char *) * (++server_expect_count));
-                asprintf (&server_expect[server_expect_count - 1], "201");
-                asprintf (&QUIT, "QUIT\r\n");
-                PROTOCOL = IPPROTO_TCP;
+        else if (!strncmp (SERVICE, "NNTP", 4)) {
+                server_expect_count = 2;
+                server_expect = malloc(sizeof(char *) * server_expect_count);
+                server_expect[0] = strdup("200");
+                server_expect[1] = strdup("201");
+                QUIT = "QUIT\r\n";
                 PORT = 119;
         }
-        else {
-                progname = strdup ("check_tcp");
+        /* fallthrough check, so it's supposed to use reverse matching */
+        else if (strcmp (SERVICE, "TCP"))
                 usage (_("CRITICAL - Generic check_tcp called with unknown service\n"));
-        }
 
-        server_address = strdup ("127.0.0.1");
+        server_address = "127.0.0.1";
         server_port = PORT;
         server_send = SEND;
         server_quit = QUIT;
-        status = strdup ("");
+        status = NULL;
 
         if (process_arguments (argc, argv) == ERROR)
                 usage4 (_("Could not parse arguments"));
 
-        /* use default expect if none listed in process_arguments() */
-        if (EXPECT && server_expect_count == 0) {
-                server_expect = malloc (sizeof (char *) * (++server_expect_count));
-                server_expect[server_expect_count - 1] = EXPECT;
+        if(flags & FLAG_VERBOSE) {
+                printf("Using service %s\n", SERVICE);
+                printf("Port: %d\n", PORT);
+                printf("flags: 0x%x\n", flags);
         }
 
-        /* initialize alarm signal handling */
-        signal (SIGALRM, socket_timeout_alarm_handler);
+        if(EXPECT && !server_expect_count)
+                server_expect_count++;
 
-        /* set socket timeout */
+        /* set up the timer */
+        signal (SIGALRM, socket_timeout_alarm_handler);
         alarm (socket_timeout);
 
         /* try to connect to the host at the given port number */
         gettimeofday (&tv, NULL);
 #ifdef HAVE_SSL
-        if (use_ssl && check_cert == TRUE) {
-          if (connect_SSL () != OK)
-            die (STATE_CRITICAL,_("CRITICAL - Could not make SSL connection\n"));
-          if ((server_cert = SSL_get_peer_certificate (ssl)) != NULL) {
-            result = check_certificate (&server_cert);
-            X509_free(server_cert);
-          }
-          else {
-            printf(_("CRITICAL - Cannot retrieve server certificate.\n"));
-            result = STATE_CRITICAL;
-          }
-          SSL_shutdown (ssl);
-          SSL_free (ssl);
-          SSL_CTX_free (ctx);
-          close (sd);
-          return result;
+        if (flags & FLAG_SSL && check_cert == TRUE) {
+                if (connect_SSL () != OK)
+                        die (STATE_CRITICAL,_("CRITICAL - Could not make SSL connection\n"));
+                if ((server_cert = SSL_get_peer_certificate (ssl)) != NULL) {
+                        result = check_certificate (&server_cert);
+                        X509_free(server_cert);
+                }
+                else {
+                        printf(_("CRITICAL - Cannot retrieve server certificate.\n"));
+                        result = STATE_CRITICAL;
+                }
+
+                SSL_shutdown (ssl);
+                SSL_free (ssl);
+                SSL_CTX_free (ctx);
+                close (sd);
+                return result;
         }
-        else if (use_ssl)
+        else if (flags & FLAG_SSL)
                 result = connect_SSL ();
         else
 #endif
@@ -290,9 +256,8 @@ main (int argc, char **argv)
                 return STATE_CRITICAL;
 
         if (server_send != NULL) {              /* Something to send? */
-                asprintf (&server_send, "%s\r\n", server_send);
 #ifdef HAVE_SSL
-                if (use_ssl)
+                if (flags & FLAG_SSL)
                         SSL_write(ssl, server_send, (int)strlen(server_send));
                 else
 #endif
@@ -304,63 +269,71 @@ main (int argc, char **argv)
                 sleep (delay);
         }
 
-        if (server_send || server_expect_count > 0) {
+        if(flags & FLAG_VERBOSE) {
+                printf("server_expect_count: %d\n", server_expect_count);
+                for(i = 0; i < server_expect_count; i++)
+                        printf("\t%d: %s\n", i, server_expect[i]);
+        }
+
+        /* if(len) later on, we know we have a non-NULL response */
+        len = 0;
+        if (server_expect_count) {
 
-                buffer = malloc (MAXBUF);
-                memset (buffer, '\0', MAXBUF);
                 /* watch for the expect string */
-                while ((i = my_recv ()) > 0) {
-                        buffer[i] = '\0';
-                        asprintf (&status, "%s%s", status, buffer);
-                        if (buffer[i-1] == '\n') {
-                                if (buffer[i-2] == '\r' || i < MAXBUF-1)
-                                        break;
-                        }
-                        if (maxbytes>0 && strlen(status) >= (unsigned)maxbytes)
+                while ((i = my_recv(buffer, sizeof(buffer))) > 0) {
+                        status = realloc(status, len + i + 1);
+                        memcpy(&status[len], buffer, i);
+                        len += i;
+
+                        /* stop reading if user-forced or data-starved */
+                        if(i < sizeof(buffer) || (maxbytes && len >= maxbytes))
+                                break;
+
+                        if (maxbytes && len >= maxbytes)
                                 break;
                 }
 
-                /* return a CRITICAL status if we couldn't read any data */
-                if (strlen(status) == 0)
+                /* no data when expected, so return critical */
+                if (len == 0)
                         die (STATE_CRITICAL, _("No data received from host\n"));
 
-                strip (status);
-
-                if (status && verbose)
-                        printf ("%s\n", status);
-
-                if (server_expect_count > 0) {
-                        for (i = 0;; i++) {
-                                if (verbose)
-                                        printf ("%d %d\n", i, (int)server_expect_count);
-                                if (i >= (int)server_expect_count)
-                                        die (expect_mismatch_state, _("Unexpected response from host: %s\n"), status);
-                                /* default expect gets exact matching */
-                                if (exact_matching) {
-                                        if (strncmp(status, server_expect[i], strlen(server_expect[i])) == 0)
-                                                break;
-                                } else {
-                                        if (strstr (status, server_expect[i]))
-                                                break;
-                                }
+                /* force null-termination and strip whitespace from end of output */
+                status[len--] = '\0';
+                /* print raw output if we're debugging */
+                if(flags & FLAG_VERBOSE)
+                        printf("received %d bytes from host\n#-raw-recv-------#\n%s\n#-raw-recv-------#\n",
+                               len + 1, status);
+                while(isspace(status[len])) status[len--] = '\0';
+
+                for (i = 0; i < server_expect_count; i++) {
+                        match = -2;             /* tag it so we know if we tried and failed */
+                        if (flags & FLAG_VERBOSE)
+                                printf ("looking for [%s] %s [%s]\n", server_expect[i],
+                                        (flags & FLAG_EXACT_MATCH) ? "in beginning of" : "anywhere in",
+                                        status);
+
+                        /* match it. math first in short-circuit */
+                        if ((flags & FLAG_EXACT_MATCH && !strncmp(status, server_expect[i], strlen(server_expect[i]))) ||
+                            (!(flags & FLAG_EXACT_MATCH) && strstr(status, server_expect[i])))
+                        {
+                                if(flags & FLAG_VERBOSE) puts("found it");
+                                match = i;
+                                break;
                         }
                 }
         }
 
         if (server_quit != NULL) {
 #ifdef HAVE_SSL
-                if (use_ssl) {
+                if (flags & FLAG_SSL) {
                         SSL_write (ssl, server_quit, (int)strlen(server_quit));
                         SSL_shutdown (ssl);
                         SSL_free (ssl);
                         SSL_CTX_free (ctx);
                 }
-                else {
+                else
 #endif
                         send (sd, server_quit, strlen (server_quit), 0);
-#ifdef HAVE_SSL
-                }
-#endif
         }
 
         /* close the connection */
@@ -370,37 +343,53 @@ main (int argc, char **argv)
         microsec = deltime (tv);
         elapsed_time = (double)microsec / 1.0e6;
 
-        if (check_critical_time == TRUE && elapsed_time > critical_time)
+        if (flags & FLAG_TIME_CRIT && elapsed_time > critical_time)
                 result = STATE_CRITICAL;
-        else if (check_warning_time == TRUE && elapsed_time > warning_time)
+        else if (flags & FLAG_TIME_WARN && elapsed_time > warning_time)
+                result = STATE_WARNING;
+
+        /* did we get the response we hoped? */
+        if(match == -2 && result != STATE_CRITICAL)
                 result = STATE_WARNING;
 
         /* reset the alarm */
         alarm (0);
 
-        printf
-                (_("%s %s%s - %.3f second response time on port %d"),
-                 SERVICE,
-                 state_text (result),
-                 (was_refused) ? " (refused)" : "",
-                 elapsed_time, server_port);
+        /* this is a bit stupid, because we don't want to print the
+         * response time (which can look ok to the user) if we didn't get
+         * the response we were looking for. if-else */
+        printf(_("%s %s - "), SERVICE, state_text(result));
 
-        if (hide_output == FALSE && status && strlen(status) > 0)
-                printf (" [%s]", status);
+        if(match == -2 && len && !(flags & FLAG_HIDE_OUTPUT))
+                printf("Unexpected response from host: %s", status);
+        else
+                printf("%.3f second response time on port %d",
+                       elapsed_time, server_port);
 
-        printf (" |%s\n", fperfdata ("time", elapsed_time, "s",
-                TRUE, warning_time,
-                TRUE, critical_time,
-                TRUE, 0,
-                TRUE, socket_timeout));
+        if (match != -2 && !(flags & FLAG_HIDE_OUTPUT) && len)
+                printf (" [%s]", status);
 
+        /* perf-data doesn't apply when server doesn't talk properly,
+         * so print all zeroes on warn and crit */
+        if(match == -2)
+                printf ("|time=%fs;0.0;0.0;0.0;0.0", elapsed_time);
+        else
+                printf("|%s",
+                                fperfdata ("time", elapsed_time, "s",
+                                   TRUE, warning_time,
+                                   TRUE, critical_time,
+                                   TRUE, 0,
+                                   TRUE, socket_timeout)
+                      );
+
+        putchar('\n');
         return result;
 }
 
 
 
 /* process command-line arguments */
-int
+static int
 process_arguments (int argc, char **argv)
 {
         int c;
@@ -472,7 +461,7 @@ process_arguments (int argc, char **argv)
                         print_revision (progname, revision);
                         exit (STATE_OK);
                 case 'v':                 /* verbose mode */
-                        verbose = TRUE;
+                        flags |= FLAG_VERBOSE;
                         break;
                 case '4':
                         address_family = AF_INET;
@@ -494,17 +483,17 @@ process_arguments (int argc, char **argv)
                                 usage4 (_("Critical threshold must be a positive integer"));
                         else
                                 critical_time = strtod (optarg, NULL);
-                        check_critical_time = TRUE;
+                        flags |= FLAG_TIME_CRIT;
                         break;
                 case 'j':                 /* hide output */
-                        hide_output = TRUE;
+                        flags |= FLAG_HIDE_OUTPUT;
                         break;
                 case 'w':                 /* warning */
                         if (!is_intnonneg (optarg))
                                 usage4 (_("Warning threshold must be a positive integer"));
                         else
                                 warning_time = strtod (optarg, NULL);
-                        check_warning_time = TRUE;
+                        flags |= FLAG_TIME_WARN;
                         break;
                 case 'C':
                         crit_codes = realloc (crit_codes, ++crit_codes_count);
@@ -531,7 +520,7 @@ process_arguments (int argc, char **argv)
                         break;
                 case 'e': /* expect string (may be repeated) */
                         EXPECT = NULL;
-                        exact_matching = FALSE;
+                        flags &= ~FLAG_EXACT_MATCH;
                         if (server_expect_count == 0)
                                 server_expect = malloc (sizeof (char *) * (++server_expect_count));
                         else
@@ -542,7 +531,7 @@ process_arguments (int argc, char **argv)
                         if (!is_intpos (optarg))
                                 usage4 (_("Maxbytes must be a positive integer"));
                         else
-                                maxbytes = atoi (optarg);
+                                maxbytes = strtol (optarg, NULL, 0);
                 case 'q':
                         asprintf(&server_quit, "%s\r\n", optarg);
                         break;
@@ -572,16 +561,19 @@ process_arguments (int argc, char **argv)
                         else
                                 usage4 (_("Delay must be a positive integer"));
                         break;
-                 case 'D': /* Check SSL cert validity - days 'til certificate expiration */
+                case 'D': /* Check SSL cert validity - days 'til certificate expiration */
 #ifdef HAVE_SSL
                         if (!is_intnonneg (optarg))
                                 usage2 (_("Invalid certificate expiration period"), optarg);
                         days_till_exp = atoi (optarg);
                         check_cert = TRUE;
-                        use_ssl = TRUE;
+                        flags |= FLAG_SSL;
                         break;
+#endif
+                        /* fallthrough if we don't have ssl */
                 case 'S':
-                        use_ssl = TRUE;
+#ifdef HAVE_SSL
+                        flags |= FLAG_SSL;
 #else
                         die (STATE_UNKNOWN, _("Invalid option - SSL is not available"));
 #endif
@@ -596,9 +588,9 @@ process_arguments (int argc, char **argv)
 }
 
 
-
+/* SSL-specific functions */
 #ifdef HAVE_SSL
-int
+static int
 connect_SSL (void)
 {
   SSL_METHOD *meth;
@@ -649,12 +641,8 @@ connect_SSL (void)
 
   return STATE_CRITICAL;
 }
-#endif
-
-
 
-#ifdef HAVE_SSL
-int
+static int
 check_certificate (X509 ** certificate)
 {
   ASN1_STRING *tm;
@@ -727,29 +715,7 @@ check_certificate (X509 ** certificate)
 
         return STATE_OK;
 }
-#endif
-
-
-
-int
-my_recv (void)
-{
-        int i;
-
-#ifdef HAVE_SSL
-        if (use_ssl) {
-                i = SSL_read (ssl, buffer, MAXBUF - 1);
-        }
-        else {
-#endif
-                i = read (sd, buffer, MAXBUF - 1);
-#ifdef HAVE_SSL
-        }
-#endif
-
-        return i;
-}
-
+#endif /* HAVE_SSL */
 
 
 void
@@ -809,7 +775,6 @@ print_help (void)
 }
 
 
-
 void
 print_usage (void)
 {
@@ -818,5 +783,6 @@ Usage: %s -H host -p port [-w <warning time>] [-c <critical time>]\n\
                   [-s <send string>] [-e <expect string>] [-q <quit string>]\n\
                   [-m <maximum bytes>] [-d <delay>] [-t <timeout seconds>]\n\
                   [-r <refuse state>] [-M <mismatch state>] [-v] [-4|-6] [-j]\n\
-                  [-D <days to cert expiry>] [-S <use SSL>]\n", progname);                
+                  [-D <days to cert expiry>] [-S <use SSL>]\n", progname);
 }
+