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check_time.c

/*****************************************************************************
* 
* Nagios check_time plugin
* 
* License: GPL
* Copyright (c) 1999-2007 Nagios Plugins Development Team
* 
* Last Modified: $Date: 2008-05-07 11:02:42 +0100 (Wed, 07 May 2008) $
* 
* Description:
* 
* This file contains the check_time plugin
* 
* This plugin will check the time difference with the specified host.
* 
* 
* 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 3 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, see <http://www.gnu.org/licenses/>.
* 
* $Id: check_time.c 1991 2008-05-07 10:02:42Z dermoth $
* 
*****************************************************************************/

const char *progname = "check_time";
const char *revision = "$Revision: 1991 $";
const char *copyright = "1999-2007";
const char *email = "nagiosplug-devel@lists.sourceforge.net";

#include "common.h"
#include "netutils.h"
#include "utils.h"

enum {
      TIME_PORT = 37
};

#define     UNIX_EPOCH 2208988800UL

uint32_t raw_server_time;
unsigned long server_time, diff_time;
int warning_time = 0;
int check_warning_time = FALSE;
int critical_time = 0;
int check_critical_time = FALSE;
unsigned long warning_diff = 0;
int check_warning_diff = FALSE;
unsigned long critical_diff = 0;
int check_critical_diff = FALSE;
int server_port = TIME_PORT;
char *server_address = NULL;
int use_udp = FALSE;

int process_arguments (int, char **);
void print_help (void);
void print_usage (void);

int
main (int argc, char **argv)
{
      int sd;
      int result = STATE_UNKNOWN;
      time_t conntime;

      setlocale (LC_ALL, "");
      bindtextdomain (PACKAGE, LOCALEDIR);
      textdomain (PACKAGE);

      /* Parse extra opts if any */
      argv=np_extra_opts (&argc, argv, progname);

      if (process_arguments (argc, argv) == ERROR)
            usage4 (_("Could not parse arguments"));

      /* initialize alarm signal handling */
      signal (SIGALRM, socket_timeout_alarm_handler);

      /* set socket timeout */
      alarm (socket_timeout);
      time (&start_time);

      /* try to connect to the host at the given port number */
      if (use_udp) {
            result = my_udp_connect (server_address, server_port, &sd);
      } else {
            result = my_tcp_connect (server_address, server_port, &sd);
      }

      if (result != STATE_OK) {
            if (check_critical_time == TRUE)
                  result = STATE_CRITICAL;
            else if (check_warning_time == TRUE)
                  result = STATE_WARNING;
            else
                  result = STATE_UNKNOWN;
            die (result,
                       _("TIME UNKNOWN - could not connect to server %s, port %d\n"),
                       server_address, server_port);
      }

      if (use_udp) {
            if (send (sd, "", 0, 0) < 0) {
                  if (check_critical_time == TRUE)
                        result = STATE_CRITICAL;
                  else if (check_warning_time == TRUE)
                        result = STATE_WARNING;
                  else
                        result = STATE_UNKNOWN;
                  die (result, 
                    _("TIME UNKNOWN - could not send UDP request to server %s, port %d\n"),
                    server_address, server_port);
            }
      }

      /* watch for the connection string */
      result = recv (sd, (void *)&raw_server_time, sizeof (raw_server_time), 0);

      /* close the connection */
      close (sd);

      /* reset the alarm */
      time (&end_time);
      alarm (0);

      /* return a WARNING status if we couldn't read any data */
      if (result <= 0) {
            if (check_critical_time == TRUE)
                  result = STATE_CRITICAL;
            else if (check_warning_time == TRUE)
                  result = STATE_WARNING;
            else
                  result = STATE_UNKNOWN;
            die (result,
                                           _("TIME UNKNOWN - no data received from server %s, port %d\n"),
                                           server_address, server_port);
      }

      result = STATE_OK;

      conntime = (end_time - start_time);
      if (check_critical_time == TRUE && conntime > critical_time)
            result = STATE_CRITICAL;
      else if (check_warning_time == TRUE && conntime > warning_time)
            result = STATE_WARNING;

      if (result != STATE_OK)
            die (result, _("TIME %s - %d second response time|%s\n"),
                 state_text (result), (int)conntime,
                 perfdata ("time", (long)conntime, "s",
                           check_warning_time, (long)warning_time,
                           check_critical_time, (long)critical_time,
                           TRUE, 0, FALSE, 0));

      server_time = ntohl (raw_server_time) - UNIX_EPOCH;
      if (server_time > (unsigned long)end_time)
            diff_time = server_time - (unsigned long)end_time;
      else
            diff_time = (unsigned long)end_time - server_time;

      if (check_critical_diff == TRUE && diff_time > critical_diff)
            result = STATE_CRITICAL;
      else if (check_warning_diff == TRUE && diff_time > warning_diff)
            result = STATE_WARNING;

      printf (_("TIME %s - %lu second time difference|%s %s\n"),
              state_text (result), diff_time,
              perfdata ("time", (long)conntime, "s",
                        check_warning_time, (long)warning_time,
                        check_critical_time, (long)critical_time,
                        TRUE, 0, FALSE, 0),
              perfdata ("offset", diff_time, "s",
                        check_warning_diff, warning_diff,
                        check_critical_diff, critical_diff,
                        TRUE, 0, FALSE, 0));
      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'},
            {"warning-variance", required_argument, 0, 'w'},
            {"critical-variance", required_argument, 0, 'c'},
            {"warning-connect", required_argument, 0, 'W'},
            {"critical-connect", required_argument, 0, 'C'},
            {"port", required_argument, 0, 'p'},
            {"udp", no_argument, 0, 'u'},
            {"timeout", required_argument, 0, 't'},
            {"version", no_argument, 0, 'V'},
            {"help", no_argument, 0, 'h'},
            {0, 0, 0, 0}
      };

      if (argc < 2)
            usage ("\n");

      for (c = 1; c < argc; c++) {
            if (strcmp ("-to", argv[c]) == 0)
                  strcpy (argv[c], "-t");
            else if (strcmp ("-wd", argv[c]) == 0)
                  strcpy (argv[c], "-w");
            else if (strcmp ("-cd", argv[c]) == 0)
                  strcpy (argv[c], "-c");
            else if (strcmp ("-wt", argv[c]) == 0)
                  strcpy (argv[c], "-W");
            else if (strcmp ("-ct", argv[c]) == 0)
                  strcpy (argv[c], "-C");
      }

      while (1) {
            c = getopt_long (argc, argv, "hVH:w:c:W:C:p:t:u", longopts,
                                                       &option);

            if (c == -1 || c == EOF)
                  break;

            switch (c) {
            case '?':                                                   /* print short usage statement if args not parsable */
                  usage5 ();
            case 'h':                                                   /* help */
                  print_help ();
                  exit (STATE_OK);
            case 'V':                                                   /* version */
                  print_revision (progname, revision);
                  exit (STATE_OK);
            case 'H':                                                   /* hostname */
                  if (is_host (optarg) == FALSE)
                        usage2 (_("Invalid hostname/address"), optarg);
                  server_address = optarg;
                  break;
            case 'w':                                                   /* warning-variance */
                  if (is_intnonneg (optarg)) {
                        warning_diff = strtoul (optarg, NULL, 10);
                        check_warning_diff = TRUE;
                  }
                  else if (strspn (optarg, "0123456789:,") > 0) {
                        if (sscanf (optarg, "%lu%*[:,]%d", &warning_diff, &warning_time) == 2) {
                              check_warning_diff = TRUE;
                              check_warning_time = TRUE;
                        }
                        else {
                              usage4 (_("Warning thresholds must be a positive integer"));
                        }
                  }
                  else {
                        usage4 (_("Warning threshold must be a positive integer"));
                  }
                  break;
            case 'c':                                                   /* critical-variance */
                  if (is_intnonneg (optarg)) {
                        critical_diff = strtoul (optarg, NULL, 10);
                        check_critical_diff = TRUE;
                  }
                  else if (strspn (optarg, "0123456789:,") > 0) {
                        if (sscanf (optarg, "%lu%*[:,]%d", &critical_diff, &critical_time) ==
                                    2) {
                              check_critical_diff = TRUE;
                              check_critical_time = TRUE;
                        }
                        else {
                              usage4 (_("Critical thresholds must be a positive integer"));
                        }
                  }
                  else {
                        usage4 (_("Critical threshold must be a positive integer"));
                  }
                  break;
            case 'W':                                                   /* warning-connect */
                  if (!is_intnonneg (optarg))
                        usage4 (_("Warning threshold must be a positive integer"));
                  else
                        warning_time = atoi (optarg);
                  check_warning_time = TRUE;
                  break;
            case 'C':                                                   /* critical-connect */
                  if (!is_intnonneg (optarg))
                        usage4 (_("Critical threshold must be a positive integer"));
                  else
                        critical_time = atoi (optarg);
                  check_critical_time = TRUE;
                  break;
            case 'p':                                                   /* port */
                  if (!is_intnonneg (optarg))
                        usage4 (_("Port must be a positive integer"));
                  else
                        server_port = atoi (optarg);
                  break;
            case 't':                                                   /* timeout */
                  if (!is_intnonneg (optarg))
                        usage2 (_("Timeout interval must be a positive integer"), optarg);
                  else
                        socket_timeout = atoi (optarg);
                  break;
            case 'u':                                                   /* udp */
                  use_udp = TRUE;
            }
      }

      c = optind;
      if (server_address == NULL) {
            if (argc > c) {
                  if (is_host (argv[c]) == FALSE)
                        usage2 (_("Invalid hostname/address"), optarg);
                  server_address = argv[c];
            }
            else {
                  usage4 (_("Hostname was not supplied"));
            }
      }

      return OK;
}



void
print_help (void)
{
      char *myport;
      asprintf (&myport, "%d", TIME_PORT);

      print_revision (progname, revision);

      printf ("Copyright (c) 1999 Ethan Galstad\n");
      printf (COPYRIGHT, copyright, email);

      printf ("%s\n", _("This plugin will check the time on the specified host."));

  printf ("\n\n");

      print_usage ();

      printf (_(UT_HELP_VRSN));
      printf (_(UT_EXTRA_OPTS));

      printf (_(UT_HOST_PORT), 'p', myport);

      printf (" %s\n", "-u, --udp");
  printf ("   %s\n", _("Use UDP to connect, not TCP"));
  printf (" %s\n", "-w, --warning-variance=INTEGER");
  printf ("   %s\n", _("Time difference (sec.) necessary to result in a warning status"));
  printf (" %s\n", "-c, --critical-variance=INTEGER");
  printf ("   %s\n", _("Time difference (sec.) necessary to result in a critical status"));
  printf (" %s\n", "-W, --warning-connect=INTEGER");
  printf ("   %s\n", _("Response time (sec.) necessary to result in warning status"));
  printf (" %s\n", "-C, --critical-connect=INTEGER");
  printf ("   %s\n", _("Response time (sec.) necessary to result in critical status"));

      printf (_(UT_TIMEOUT), DEFAULT_SOCKET_TIMEOUT);

#ifdef NP_EXTRA_OPTS
      printf ("\n");
      printf ("%s\n", _("Notes:"));
      printf (_(UT_EXTRA_OPTS_NOTES));
#endif

      printf (_(UT_SUPPORT));
}



void
print_usage (void)
{
  printf (_("Usage:"));
      printf ("%s -H <host_address> [-p port] [-u] [-w variance] [-c variance]\n",progname);
  printf (" [-W connect_time] [-C connect_time] [-t timeout]\n");
}

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