/***************************************************************************** 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 2 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, write to the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. $Id$ *****************************************************************************/ /* progname "check_tcp" changes depending on symlink called */ char *progname; const char *revision = "$Revision$"; const char *copyright = "1999-2004"; const char *email = "nagiosplug-devel@lists.sourceforge.net"; #include "common.h" #include "netutils.h" #include "utils.h" #ifdef HAVE_SSL_H # include # include # include # include # include # include #else # ifdef HAVE_OPENSSL_SSL_H # include # include # include # include # include # include # endif #endif #ifdef HAVE_SSL 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 /* int my_recv(char *, size_t); */ static int process_arguments (int, char **); void print_help (void); void print_usage (void); #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 = NULL; struct timeval tv; size_t len, match = -1; setlocale (LC_ALL, ""); bindtextdomain (PACKAGE, LOCALEDIR); textdomain (PACKAGE); /* 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]); } /* 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 (!strncmp(SERVICE, "FTP", 3)) { EXPECT = "220"; QUIT = "QUIT\r\n"; PORT = 21; } else if (!strncmp(SERVICE, "POP", 3) || !strncmp(SERVICE, "POP3", 4)) { EXPECT = "+OK"; QUIT = "QUIT\r\n"; PORT = 110; } 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 (!strncmp(SERVICE, "SIMAP", 5)) { EXPECT = "* OK"; QUIT = "a1 LOGOUT\r\n"; flags |= FLAG_SSL; PORT = 993; } else if (!strncmp(SERVICE, "SPOP", 4)) { EXPECT = "+OK"; QUIT = "QUIT\r\n"; flags |= FLAG_SSL; PORT = 995; } else if (!strncmp(SERVICE, "SSMTP", 5)) { EXPECT = "220"; QUIT = "QUIT\r\n"; flags |= FLAG_SSL; PORT = 465; } else if (!strncmp(SERVICE, "JABBER", 6)) { SEND = "\n"; EXPECT = " 0) { tv.tv_sec += delay; sleep (delay); } 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) { /* 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; /* stop reading if user-forced or data-starved */ if(i < sizeof(buffer) || (maxbytes && len >= maxbytes)) break; if (maxbytes && len >= maxbytes) break; } /* no data when expected, so return critical */ if (len == 0) die (STATE_CRITICAL, _("No data received from host\n")); /* 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 (flags & FLAG_SSL) { SSL_write (ssl, server_quit, (int)strlen(server_quit)); SSL_shutdown (ssl); SSL_free (ssl); SSL_CTX_free (ctx); } else #endif send (sd, server_quit, strlen (server_quit), 0); } /* close the connection */ if (sd) close (sd); microsec = deltime (tv); elapsed_time = (double)microsec / 1.0e6; if (flags & FLAG_TIME_CRIT && elapsed_time > critical_time) result = STATE_CRITICAL; 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); /* 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(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); 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 */ static int process_arguments (int argc, char **argv) { int c; int option = 0; static struct option longopts[] = { {"hostname", required_argument, 0, 'H'}, {"critical-time", required_argument, 0, 'c'}, {"warning-time", required_argument, 0, 'w'}, {"critical-codes", required_argument, 0, 'C'}, {"warning-codes", required_argument, 0, 'W'}, {"timeout", required_argument, 0, 't'}, {"protocol", required_argument, 0, 'P'}, {"port", required_argument, 0, 'p'}, {"send", required_argument, 0, 's'}, {"expect", required_argument, 0, 'e'}, {"maxbytes", required_argument, 0, 'm'}, {"quit", required_argument, 0, 'q'}, {"jail", required_argument, 0, 'j'}, {"delay", required_argument, 0, 'd'}, {"refuse", required_argument, 0, 'r'}, {"mismatch", required_argument, 0, 'M'}, {"use-ipv4", no_argument, 0, '4'}, {"use-ipv6", no_argument, 0, '6'}, {"verbose", no_argument, 0, 'v'}, {"version", no_argument, 0, 'V'}, {"help", no_argument, 0, 'h'}, #ifdef HAVE_SSL {"ssl", no_argument, 0, 'S'}, {"certificate", required_argument, 0, 'D'}, #endif {0, 0, 0, 0} }; if (argc < 2) usage4 (_("No arguments found")); /* backwards compatibility */ 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 (!is_option (argv[1])) { server_address = argv[1]; argv[1] = argv[0]; argv = &argv[1]; argc--; } while (1) { c = getopt_long (argc, argv, "+hVv46H:s:e:q:m:c:w:t:p:C:W:d:Sr:jD:M:", longopts, &option); if (c == -1 || c == EOF || c == 1) break; switch (c) { case '?': /* print short usage statement if args not parsable */ usage2 (_("Unknown argument"), optarg); case 'h': /* help */ print_help (); exit (STATE_OK); case 'V': /* version */ print_revision (progname, revision); exit (STATE_OK); case 'v': /* verbose mode */ flags |= FLAG_VERBOSE; break; case '4': address_family = AF_INET; break; case '6': #ifdef USE_IPV6 address_family = AF_INET6; #else usage4 (_("IPv6 support not available")); #endif break; case 'H': /* hostname */ if (is_host (optarg) == FALSE) usage2 (_("Invalid hostname/address"), optarg); server_address = optarg; break; case 'c': /* critical */ if (!is_intnonneg (optarg)) usage4 (_("Critical threshold must be a positive integer")); else critical_time = strtod (optarg, NULL); flags |= FLAG_TIME_CRIT; break; case 'j': /* hide output */ 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); flags |= FLAG_TIME_WARN; break; case 'C': crit_codes = realloc (crit_codes, ++crit_codes_count); crit_codes[crit_codes_count - 1] = optarg; break; case 'W': warn_codes = realloc (warn_codes, ++warn_codes_count); warn_codes[warn_codes_count - 1] = optarg; break; case 't': /* timeout */ if (!is_intpos (optarg)) usage4 (_("Timeout interval must be a positive integer")); else socket_timeout = atoi (optarg); break; case 'p': /* port */ if (!is_intpos (optarg)) usage4 (_("Port must be a positive integer")); else server_port = atoi (optarg); break; case 's': server_send = optarg; break; case 'e': /* expect string (may be repeated) */ EXPECT = NULL; flags &= ~FLAG_EXACT_MATCH; if (server_expect_count == 0) server_expect = malloc (sizeof (char *) * (++server_expect_count)); else server_expect = realloc (server_expect, sizeof (char *) * (++server_expect_count)); server_expect[server_expect_count - 1] = optarg; break; case 'm': if (!is_intpos (optarg)) usage4 (_("Maxbytes must be a positive integer")); else maxbytes = strtol (optarg, NULL, 0); case 'q': asprintf(&server_quit, "%s\r\n", optarg); break; case 'r': if (!strncmp(optarg,"ok",2)) econn_refuse_state = STATE_OK; else if (!strncmp(optarg,"warn",4)) econn_refuse_state = STATE_WARNING; else if (!strncmp(optarg,"crit",4)) econn_refuse_state = STATE_CRITICAL; else usage4 (_("Refuse must be one of ok, warn, crit")); break; case 'M': if (!strncmp(optarg,"ok",2)) expect_mismatch_state = STATE_OK; else if (!strncmp(optarg,"warn",4)) expect_mismatch_state = STATE_WARNING; else if (!strncmp(optarg,"crit",4)) expect_mismatch_state = STATE_CRITICAL; else usage4 (_("Mismatch must be one of ok, warn, crit")); break; case 'd': if (is_intpos (optarg)) delay = atoi (optarg); else usage4 (_("Delay must be a positive integer")); break; 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; flags |= FLAG_SSL; break; #endif /* fallthrough if we don't have ssl */ case 'S': #ifdef HAVE_SSL flags |= FLAG_SSL; #else die (STATE_UNKNOWN, _("Invalid option - SSL is not available")); #endif break; } } if (server_address == NULL) usage4 (_("You must provide a server address")); return TRUE; } /* SSL-specific functions */ #ifdef HAVE_SSL static int connect_SSL (void) { SSL_METHOD *meth; /* Initialize SSL context */ SSLeay_add_ssl_algorithms (); meth = SSLv23_client_method (); SSL_load_error_strings (); OpenSSL_add_all_algorithms(); if ((ctx = SSL_CTX_new (meth)) == NULL) { printf (_("CRITICAL - Cannot create SSL context.\n")); return STATE_CRITICAL; } /* Initialize alarm signal handling */ signal (SIGALRM, socket_timeout_alarm_handler); /* Set socket timeout */ alarm (socket_timeout); /* Save start time */ time (&start_time); /* Make TCP connection */ if (my_tcp_connect (server_address, server_port, &sd) == STATE_OK && was_refused == FALSE) { /* Do the SSL handshake */ if ((ssl = SSL_new (ctx)) != NULL) { SSL_set_fd (ssl, sd); if (SSL_connect(ssl) == 1) return OK; /* ERR_print_errors_fp (stderr); */ printf (_("CRITICAL - Cannot make SSL connection ")); ERR_print_errors_fp (stdout); /* printf("\n"); */ } else { printf (_("CRITICAL - Cannot initiate SSL handshake.\n")); } SSL_free (ssl); } SSL_CTX_free (ctx); close (sd); return STATE_CRITICAL; } static int check_certificate (X509 ** certificate) { ASN1_STRING *tm; int offset; struct tm stamp; int days_left; /* Retrieve timestamp of certificate */ tm = X509_get_notAfter (*certificate); /* Generate tm structure to process timestamp */ if (tm->type == V_ASN1_UTCTIME) { if (tm->length < 10) { printf (_("CRITICAL - Wrong time format in certificate.\n")); return STATE_CRITICAL; } else { stamp.tm_year = (tm->data[0] - '0') * 10 + (tm->data[1] - '0'); if (stamp.tm_year < 50) stamp.tm_year += 100; offset = 0; } } else { if (tm->length < 12) { printf (_("CRITICAL - Wrong time format in certificate.\n")); return STATE_CRITICAL; } else { stamp.tm_year = (tm->data[0] - '0') * 1000 + (tm->data[1] - '0') * 100 + (tm->data[2] - '0') * 10 + (tm->data[3] - '0'); stamp.tm_year -= 1900; offset = 2; } } stamp.tm_mon = (tm->data[2 + offset] - '0') * 10 + (tm->data[3 + offset] - '0') - 1; stamp.tm_mday = (tm->data[4 + offset] - '0') * 10 + (tm->data[5 + offset] - '0'); stamp.tm_hour = (tm->data[6 + offset] - '0') * 10 + (tm->data[7 + offset] - '0'); stamp.tm_min = (tm->data[8 + offset] - '0') * 10 + (tm->data[9 + offset] - '0'); stamp.tm_sec = 0; stamp.tm_isdst = -1; days_left = (mktime (&stamp) - time (NULL)) / 86400; snprintf (timestamp, 16, "%02d/%02d/%04d %02d:%02d", stamp.tm_mon + 1, stamp.tm_mday, stamp.tm_year + 1900, stamp.tm_hour, stamp.tm_min); if (days_left > 0 && days_left <= days_till_exp) { printf (_("Certificate expires in %d day(s) (%s).\n"), days_left, timestamp); return STATE_WARNING; } if (days_left < 0) { printf (_("Certificate expired on %s.\n"), timestamp); return STATE_CRITICAL; } if (days_left == 0) { printf (_("Certificate expires today (%s).\n"), timestamp); return STATE_WARNING; } printf (_("Certificate will expire on %s.\n"), timestamp); return STATE_OK; } #endif /* HAVE_SSL */ void print_help (void) { print_revision (progname, revision); printf ("Copyright (c) 1999 Ethan Galstad \n"); printf (COPYRIGHT, copyright, email); printf (_("This plugin tests %s connections with the specified host.\n\n"), SERVICE); print_usage (); printf (_(UT_HELP_VRSN)); printf (_(UT_HOST_PORT), 'p', "none"); printf (_(UT_IPv46)); printf (_("\ -s, --send=STRING\n\ String to send to the server\n\ -e, --expect=STRING\n\ String to expect in server response\n\ -q, --quit=STRING\n\ String to send server to initiate a clean close of the connection\n")); printf (_("\ -r, --refuse=ok|warn|crit\n\ Accept tcp refusals with states ok, warn, crit (default: crit)\n\ -M, --mismatch=ok|warn|crit\n\ Accept expected string mismatches with states ok, warn, crit (default: warn)\n\ -j, --jail\n\ Hide output from TCP socket\n\ -m, --maxbytes=INTEGER\n\ Close connection once more than this number of bytes are received\n\ -d, --delay=INTEGER\n\ Seconds to wait between sending string and polling for response\n")); #ifdef HAVE_SSL printf (_("\ -D, --certificate=INTEGER\n\ Minimum number of days a certificate has to be valid.\n\ -S, --ssl\n\ Use SSL for the connection.\n")); #endif printf (_(UT_WARN_CRIT)); printf (_(UT_TIMEOUT), DEFAULT_SOCKET_TIMEOUT); printf (_(UT_VERBOSE)); printf (_(UT_SUPPORT)); } void print_usage (void) { printf ("\ Usage: %s -H host -p port [-w ] [-c ]\n\ [-s ] [-e ] [-q ]\n\ [-m ] [-d ] [-t ]\n\ [-r ] [-M ] [-v] [-4|-6] [-j]\n\ [-D ] [-S ]\n", progname); }