/***************************************************************************** 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 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 **); #endif enum { TCP_PROTOCOL = 1, UDP_PROTOCOL = 2, MAXBUF = 1024 }; int process_arguments (int, char **); int my_recv (void); 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; int main (int argc, char **argv) { int result = STATE_UNKNOWN; int i; char *status; struct timeval tv; 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 = UDP_PROTOCOL; PORT = 0; } else if (strstr (argv[0], "check_tcp")) { progname = strdup ("check_tcp"); SERVICE = strdup ("TCP"); SEND = NULL; EXPECT = NULL; QUIT = NULL; PROTOCOL = TCP_PROTOCOL; PORT = 0; } 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 = TCP_PROTOCOL; 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 = TCP_PROTOCOL; 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 = TCP_PROTOCOL; 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 = TCP_PROTOCOL; 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=TCP_PROTOCOL; use_ssl=TRUE; 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=TCP_PROTOCOL; use_ssl=TRUE; 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=TCP_PROTOCOL; use_ssl=TRUE; PORT=465; } else if (strstr(argv[0],"check_jabber")) { progname = strdup("check_jabber"); SERVICE = strdup("JABBER"); SEND = strdup("\n"); EXPECT = strdup("\n"); PROTOCOL=TCP_PROTOCOL; use_ssl=TRUE; 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 = TCP_PROTOCOL; use_ssl=TRUE; 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 = TCP_PROTOCOL; PORT = 119; } else { progname = strdup ("check_tcp"); usage (_("CRITICAL - Generic check_tcp called with unknown service\n")); } server_address = strdup ("127.0.0.1"); server_port = PORT; server_send = SEND; server_quit = QUIT; status = strdup (""); 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; } /* initialize alarm signal handling */ signal (SIGALRM, socket_timeout_alarm_handler); /* set socket timeout */ 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; } else if (use_ssl) result = connect_SSL (); else #endif { if (PROTOCOL == UDP_PROTOCOL) result = my_udp_connect (server_address, server_port, &sd); else /* default is TCP */ result = my_tcp_connect (server_address, server_port, &sd); } if (result == STATE_CRITICAL) return STATE_CRITICAL; if (server_send != NULL) { /* Something to send? */ asprintf (&server_send, "%s\r\n", server_send); #ifdef HAVE_SSL if (use_ssl) SSL_write(ssl, server_send, (int)strlen(server_send)); else #endif send (sd, server_send, strlen(server_send), 0); } if (delay > 0) { tv.tv_sec += delay; sleep (delay); } if (server_send || server_expect_count > 0) { 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-2] == '\r' && buffer[i-1] == '\n') break; if (maxbytes>0 && strlen(status) >= (unsigned)maxbytes) break; } /* return a CRITICAL status if we couldn't read any data */ if (strlen(status) == 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; } } } } if (server_quit != NULL) { #ifdef HAVE_SSL if (use_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); #ifdef HAVE_SSL } #endif } /* close the connection */ if (sd) close (sd); microsec = deltime (tv); elapsed_time = (double)microsec / 1.0e6; if (check_critical_time == TRUE && elapsed_time > critical_time) result = STATE_CRITICAL; else if (check_warning_time == TRUE && elapsed_time > warning_time) 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); if (hide_output == FALSE && status && strlen(status) > 0) printf (" [%s]", status); printf (" |%s\n", fperfdata ("time", elapsed_time, "s", TRUE, warning_time, TRUE, critical_time, TRUE, 0, TRUE, socket_timeout)); return result; } /* 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'}, {"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 */ verbose = TRUE; 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); check_critical_time = TRUE; break; case 'j': /* hide output */ hide_output = TRUE; 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; 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; exact_matching = FALSE; 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 = atoi (optarg); 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; use_ssl = TRUE; break; case 'S': use_ssl = TRUE; #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; } #ifdef HAVE_SSL 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; } #endif #ifdef HAVE_SSL 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 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; } 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); }