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/******************************************************************************
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* Program: UDP port plugin for Nagios
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* Copyright (c) 1999 Ethan Galstad (nagios@nagios.org)
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* Last Modified: $Date: 2003/03/07 06:40:33 $
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* Command line: CHECK_UDP <host_address> [-p port] [-s send] [-e expect] \
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* [-wt warn_time] [-ct crit_time] [-to to_sec]
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* This plugin will attempt to connect to the specified port
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* on the host. Successul connects return STATE_OK, refusals
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* and timeouts return STATE_CRITICAL, other errors return
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* License Information:
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*****************************************************************************/
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const char *progname = "check_udp";
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int check_warning_time = FALSE;
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int critical_time = 0;
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int check_critical_time = FALSE;
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int process_arguments (int, char **);
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void print_usage (void);
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void print_help (void);
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char *server_address = NULL;
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char *server_expect = NULL;
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char *server_send = "";
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main (int argc, char **argv)
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char recv_buffer[MAX_INPUT_BUFFER];
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if (process_arguments (argc, argv) == ERROR)
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/* initialize alarm signal handling */
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signal (SIGALRM, socket_timeout_alarm_handler);
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/* set socket timeout */
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alarm (socket_timeout);
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process_udp_request (server_address, server_port, server_send,
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recv_buffer, MAX_INPUT_BUFFER - 1);
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if (result != STATE_OK) {
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printf ("No response from host on port %d\n", server_port);
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result = STATE_CRITICAL;
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/* check to see if we got the response we wanted */
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if (!strstr (recv_buffer, server_expect)) {
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printf ("Invalid response received from host on port %d\n",
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result = STATE_CRITICAL;
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/* we connected, so close connection before exiting */
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if (result == STATE_OK) {
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if (check_critical_time == TRUE
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&& (end_time - start_time) > critical_time) result = STATE_CRITICAL;
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else if (check_warning_time == TRUE
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&& (end_time - start_time) > warning_time) result =
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printf ("Connection %s on port %d - %d second response time\n",
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(result == STATE_OK) ? "accepted" : "problem", server_port,
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(int) (end_time - start_time));
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/* reset the alarm */
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/* process command-line arguments */
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process_arguments (int argc, char **argv)
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int option_index = 0;
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static struct option long_options[] = {
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{"hostname", required_argument, 0, 'H'},
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{"critical", required_argument, 0, 'c'},
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{"warning", required_argument, 0, 'w'},
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{"timeout", required_argument, 0, 't'},
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{"port", required_argument, 0, 'p'},
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{"expect", required_argument, 0, 'e'},
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{"send", required_argument, 0, 's'},
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{"verbose", no_argument, 0, 'v'},
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{"version", no_argument, 0, 'V'},
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{"help", no_argument, 0, 'h'},
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for (c = 1; c < argc; c++) {
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if (strcmp ("-to", argv[c]) == 0)
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strcpy (argv[c], "-t");
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else if (strcmp ("-wt", argv[c]) == 0)
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strcpy (argv[c], "-w");
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else if (strcmp ("-ct", argv[c]) == 0)
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strcpy (argv[c], "-c");
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c = getopt_long (argc, argv, "+hVvH:e:s:c:w:t:p:", long_options, &option_index);
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c = getopt (argc, argv, "+hVvH:e:s:c:w:t:p:");
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if (c == -1 || c == EOF || c == 1)
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case '?': /* print short usage statement if args not parsable */
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printf ("%s: Unknown argument: %s\n\n", progname, optarg);
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exit (STATE_UNKNOWN);
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case 'V': /* version */
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print_revision (progname, "$Revision: 1.4.2.1 $");
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case 'v': /* verbose mode */
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case 'H': /* hostname */
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if (is_host (optarg) == FALSE)
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usage ("Invalid host name/address\n");
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server_address = optarg;
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case 'c': /* critical */
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if (!is_intnonneg (optarg))
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usage ("Critical threshold must be a nonnegative integer\n");
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critical_time = atoi (optarg);
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check_critical_time = TRUE;
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case 'w': /* warning */
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if (!is_intnonneg (optarg))
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usage ("Warning threshold must be a nonnegative integer\n");
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warning_time = atoi (optarg);
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check_warning_time = TRUE;
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case 't': /* timeout */
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if (!is_intnonneg (optarg))
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usage ("Timeout interval must be a nonnegative integer\n");
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socket_timeout = atoi (optarg);
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if (!is_intnonneg (optarg))
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usage ("Serevr port must be a nonnegative integer\n");
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server_port = atoi (optarg);
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case 'e': /* expect */
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server_expect = optarg;
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server_send = optarg;
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if (server_address == NULL && c < argc && argv[c]) {
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if (is_host (argv[c]) == FALSE)
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usage ("Invalid host name/address\n");
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server_address = argv[c++];
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if (server_address == NULL)
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usage ("Host name was not supplied\n");
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("Usage: %s -H <host_address> [-p port] [-w warn_time] [-c crit_time]\n"
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" [-e expect] [-s send] [-t to_sec] [-v]\n", progname);
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print_revision (progname, "$Revision: 1.4.2.1 $");
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("Copyright (c) 1999 Ethan Galstad (nagios@nagios.org)\n\n"
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"This plugin tests an UDP connection with the specified host.\n\n");
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" -H, --hostname=ADDRESS\n"
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" Host name argument for servers using host headers (use numeric\n"
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" address if possible to bypass DNS lookup).\n"
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" -p, --port=INTEGER\n"
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" -e, --expect=STRING <optional>\n"
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" String to expect in first line of server response\n"
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" -s, --send=STRING <optional>\n"
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" String to send to the server when initiating the connection\n"
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" -w, --warning=INTEGER <optional>\n"
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" Response time to result in warning status (seconds)\n"
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" -c, --critical=INTEGER <optional>\n"
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" Response time to result in critical status (seconds)\n"
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" -t, --timeout=INTEGER <optional>\n"
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" Seconds before connection times out (default: %d)\n"
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" -v, --verbose <optional>\n"
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" Show details for command-line debugging (do not use with nagios server)\n"
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" Print detailed help screen and exit\n"
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" Print version information and exit\n", DEFAULT_SOCKET_TIMEOUT);
added
removed
plugins/check_udp.c
