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/******************************************************************************
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* Program: Nagios process plugin for Nagios
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* Copyright (c) 1999 Ethan Galstad (nagios@nagios.org)
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* $Id: check_nagios.c,v 1.4 2003/01/13 12:15:16 kdebisschop Exp $
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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_nagios";
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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 *status_log = NULL;
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char *process_string = NULL;
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int expire_minutes = 0;
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main (int argc, char **argv)
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int result = STATE_UNKNOWN;
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char input_buffer[MAX_INPUT_BUFFER];
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unsigned long latest_entry_time = 0L;
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unsigned long temp_entry_time = 0L;
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if (process_arguments (argc, argv) == ERROR)
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usage ("Could not parse arguments\n");
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/* Set signal handling and alarm */
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if (signal (SIGALRM, timeout_alarm_handler) == SIG_ERR) {
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printf ("Cannot catch SIGALRM");
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/* handle timeouts gracefully... */
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alarm (timeout_interval);
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/* open the status log */
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fp = fopen (status_log, "r");
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printf ("Error: Cannot open status log for reading!\n");
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return STATE_CRITICAL;
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/* get the date/time of the last item updated in the log */
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while (fgets (input_buffer, MAX_INPUT_BUFFER - 1, fp)) {
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temp_ptr = strtok (input_buffer, "]");
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(temp_ptr == NULL) ? 0L : strtoul (temp_ptr + 1, NULL, 10);
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if (temp_entry_time > latest_entry_time)
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latest_entry_time = temp_entry_time;
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/* run the command to check for the Nagios process.. */
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child_process = spopen (PS_RAW_COMMAND);
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if (child_process == NULL) {
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printf ("Could not open pipe: %s\n", PS_RAW_COMMAND);
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child_stderr = fdopen (child_stderr_array[fileno (child_process)], "r");
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if (child_stderr == NULL) {
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printf ("Could not open stderr for %s\n", PS_RAW_COMMAND);
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/* count the number of matching Nagios processes... */
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while (fgets (input_buffer, MAX_INPUT_BUFFER - 1, child_process)) {
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if (!strstr(input_buffer, argv[0]) && strstr(input_buffer, process_string))
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/* If we get anything on stderr, at least set warning */
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while (fgets (input_buffer, MAX_INPUT_BUFFER - 1, child_stderr))
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result = max_state (result, STATE_WARNING);
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(void) fclose (child_stderr);
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if (spclose (child_process))
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result = max_state (result, STATE_WARNING);
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/* reset the alarm handler */
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if (proc_entries == 0) {
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printf ("Could not locate a running Nagios process!\n");
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return STATE_CRITICAL;
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time (¤t_time);
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if ((current_time - latest_entry_time) > (expire_minutes * 60))
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result = STATE_WARNING;
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("Nagios %s: located %d process%s, status log updated %d second%s ago\n",
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(result == STATE_OK) ? "ok" : "problem", proc_entries,
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(proc_entries == 1) ? "" : "es",
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(int) (current_time - latest_entry_time),
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((int) (current_time - latest_entry_time) == 1) ? "" : "s");
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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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{"filename", required_argument, 0, 'F'},
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{"expires", required_argument, 0, 'e'},
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{"command", required_argument, 0, 'C'},
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{"version", no_argument, 0, 'V'},
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{"help", no_argument, 0, 'h'},
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if (!is_option (argv[1])) {
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status_log = argv[1];
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if (is_intnonneg (argv[2]))
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expire_minutes = atoi (argv[2]);
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terminate (STATE_UNKNOWN,
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"Expiration time must be an integer (seconds)\nType '%s -h' for additional help\n",
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process_string = argv[3];
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c = getopt_long (argc, argv, "+hVF:C:e:", long_options, &option_index);
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c = getopt (argc, argv, "+hVF:C:e:");
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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: %c\n\n", progname, optopt);
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exit (STATE_UNKNOWN);
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case 'V': /* version */
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print_revision (progname, "$Revision: 1.4 $");
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case 'F': /* hostname */
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case 'C': /* hostname */
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process_string = optarg;
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case 'e': /* hostname */
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if (is_intnonneg (optarg))
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expire_minutes = atoi (optarg);
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terminate (STATE_UNKNOWN,
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"Expiration time must be an integer (seconds)\nType '%s -h' for additional help\n",
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if (status_log == NULL)
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terminate (STATE_UNKNOWN,
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"You must provide the status_log\nType '%s -h' for additional help\n",
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else if (process_string == NULL)
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terminate (STATE_UNKNOWN,
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"You must provide a process string\nType '%s -h' for additional help\n",
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("Usage: %s -F <status log file> -e <expire_minutes> -C <process_string>\n",
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print_revision (progname, "$Revision: 1.4 $");
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("Copyright (c) 2000 Ethan Galstad/Karl DeBisschop\n\n"
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"This plugin attempts to check the status of the Nagios process on the local\n"
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"machine. The plugin will check to make sure the Nagios status log is no older\n"
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"than the number of minutes specified by the <expire_minutes> option. It also\n"
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"uses the /bin/ps command to check for a process matching whatever you specify\n"
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"by the <process_string> argument.\n");
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"-F, --filename=FILE\n"
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" Name of the log file to check\n"
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"-e, --expires=INTEGER\n"
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" Seconds aging afterwhich logfile is condsidered stale\n"
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"-C, --command=STRING\n"
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" Command to search for in process table\n"
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" Print this help screen\n"
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" Print version information\n\n"
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" ./check_nagios -F /usr/local/nagios/var/status.log -e 5 -C /usr/local/nagios/bin/nagios\n");
added
removed
plugins/check_nagios.c
