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check_real.c

/******************************************************************************
*
* Nagios check_real plugin
*
* License: GPL
* Copyright (c) 1999-2006 nagios-plugins team
*
* Last Modified: $Date: 2007-01-28 21:46:41 +0000 (Sun, 28 Jan 2007) $
*
* Description:
*
* This file contains the check_real plugin
*
*  This plugin tests the REAL service on the specified host.
*
*
* License Information:
*
* 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: check_real.c 1590 2007-01-28 21:46:41Z hweiss $
* 
******************************************************************************/

const char *progname = "check_real";
const char *revision = "$Revision: 1590 $";
const char *copyright = "2000-2006";
const char *email = "nagiosplug-devel@lists.sourceforge.net";

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

enum {
      PORT  = 554
};

#define EXPECT    "RTSP/1."
#define URL ""

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

int server_port = PORT;
char *server_address;
char *host_name;
char *server_url = NULL;
char *server_expect;
int warning_time = 0;
int check_warning_time = FALSE;
int critical_time = 0;
int check_critical_time = FALSE;
int verbose = FALSE;



int
main (int argc, char **argv)
{
      int sd;
      int result = STATE_UNKNOWN;
      char buffer[MAX_INPUT_BUFFER];
      char *status_line = NULL;

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

      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 (my_tcp_connect (server_address, server_port, &sd) != STATE_OK)
            die (STATE_CRITICAL, _("Unable to connect to %s on port %d\n"),
                                           server_address, server_port);

      /* Part I - Server Check */

      /* send the OPTIONS request */
      sprintf (buffer, "OPTIONS rtsp://%s:%d RTSP/1.0\r\n", host_name, server_port);
      result = send (sd, buffer, strlen (buffer), 0);

      /* send the header sync */
      sprintf (buffer, "CSeq: 1\r\n");
      result = send (sd, buffer, strlen (buffer), 0);

      /* send a newline so the server knows we're done with the request */
      sprintf (buffer, "\r\n");
      result = send (sd, buffer, strlen (buffer), 0);

      /* watch for the REAL connection string */
      result = recv (sd, buffer, MAX_INPUT_BUFFER - 1, 0);

      /* return a CRITICAL status if we couldn't read any data */
      if (result == -1)
            die (STATE_CRITICAL, _("No data received from %s\n"), host_name);

      /* make sure we find the response we are looking for */
      if (!strstr (buffer, server_expect)) {
            if (server_port == PORT)
                  printf ("%s\n", _("Invalid REAL response received from host"));
            else
                  printf (_("Invalid REAL response received from host on port %d\n"),
                                          server_port);
      }
      else {
            /* else we got the REAL string, so check the return code */

            time (&end_time);

            result = STATE_OK;

            status_line = (char *) strtok (buffer, "\n");

            if (strstr (status_line, "200"))
                  result = STATE_OK;

            /* client errors result in a warning state */
            else if (strstr (status_line, "400"))
                  result = STATE_WARNING;
            else if (strstr (status_line, "401"))
                  result = STATE_WARNING;
            else if (strstr (status_line, "402"))
                  result = STATE_WARNING;
            else if (strstr (status_line, "403"))
                  result = STATE_WARNING;
            else if (strstr (status_line, "404"))
                  result = STATE_WARNING;

            /* server errors result in a critical state */
            else if (strstr (status_line, "500"))
                  result = STATE_CRITICAL;
            else if (strstr (status_line, "501"))
                  result = STATE_CRITICAL;
            else if (strstr (status_line, "502"))
                  result = STATE_CRITICAL;
            else if (strstr (status_line, "503"))
                  result = STATE_CRITICAL;

            else
                  result = STATE_UNKNOWN;
      }

      /* Part II - Check stream exists and is ok */
      if ((result == STATE_OK )&& (server_url != NULL) ) {

            /* Part I - Server Check */

            /* send the OPTIONS request */
            sprintf (buffer, "DESCRIBE rtsp://%s:%d%s RTSP/1.0\n", host_name,
                                     server_port, server_url);
            result = send (sd, buffer, strlen (buffer), 0);

            /* send the header sync */
            sprintf (buffer, "CSeq: 2\n");
            result = send (sd, buffer, strlen (buffer), 0);

            /* send a newline so the server knows we're done with the request */
            sprintf (buffer, "\n");
            result = send (sd, buffer, strlen (buffer), 0);

            /* watch for the REAL connection string */
            result = recv (sd, buffer, MAX_INPUT_BUFFER - 1, 0);

            /* return a CRITICAL status if we couldn't read any data */
            if (result == -1) {
                  printf (_("No data received from host\n"));
                  result = STATE_CRITICAL;
            }
            else {
                  /* make sure we find the response we are looking for */
                  if (!strstr (buffer, server_expect)) {
                        if (server_port == PORT)
                              printf ("%s\n", _("Invalid REAL response received from host"));
                        else
                              printf (_("Invalid REAL response received from host on port %d\n"),
                                                      server_port);
                  }
                  else {

                        /* else we got the REAL string, so check the return code */

                        time (&end_time);

                        result = STATE_OK;

                        status_line = (char *) strtok (buffer, "\n");

                        if (strstr (status_line, "200"))
                              result = STATE_OK;

                        /* client errors result in a warning state */
                        else if (strstr (status_line, "400"))
                              result = STATE_WARNING;
                        else if (strstr (status_line, "401"))
                              result = STATE_WARNING;
                        else if (strstr (status_line, "402"))
                              result = STATE_WARNING;
                        else if (strstr (status_line, "403"))
                              result = STATE_WARNING;
                        else if (strstr (status_line, "404"))
                              result = STATE_WARNING;

                        /* server errors result in a critical state */
                        else if (strstr (status_line, "500"))
                              result = STATE_CRITICAL;
                        else if (strstr (status_line, "501"))
                              result = STATE_CRITICAL;
                        else if (strstr (status_line, "502"))
                              result = STATE_CRITICAL;
                        else if (strstr (status_line, "503"))
                              result = STATE_CRITICAL;

                        else
                              result = STATE_UNKNOWN;
                  }
            }
      }

      /* Return results */
      if (result == STATE_OK) {

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

            /* Put some HTML in here to create a dynamic link */
            printf (_("REAL %s - %d second response time\n"),
                                    state_text (result),
                                    (int) (end_time - start_time));
      }
      else
            printf ("%s\n", status_line);

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

      /* reset the alarm */
      alarm (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'},
            {"IPaddress", required_argument, 0, 'I'},
            {"expect", required_argument, 0, 'e'},
            {"url", required_argument, 0, 'u'},
            {"port", required_argument, 0, 'p'},
            {"critical", required_argument, 0, 'c'},
            {"warning", required_argument, 0, 'w'},
            {"timeout", required_argument, 0, 't'},
            {"verbose", no_argument, 0, 'v'},
            {"version", no_argument, 0, 'V'},
            {"help", no_argument, 0, 'h'},
            {0, 0, 0, 0}
      };

      if (argc < 2)
            return ERROR;

      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");
      }

      while (1) {
            c = getopt_long (argc, argv, "+hvVI:H:e:u:p:w:c:t:", longopts,
                                                       &option);

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

            switch (c) {
            case 'I':                                                   /* hostname */
            case 'H':                                                   /* hostname */
                  if (server_address)
                        break;
                  else if (is_host (optarg))
                        server_address = optarg;
                  else
                        usage2 (_("Invalid hostname/address"), optarg);
                  break;
            case 'e':                                                   /* string to expect in response header */
                  server_expect = optarg;
                  break;
            case 'u':                                                   /* server URL */
                  server_url = optarg;
                  break;
            case 'p':                                                   /* port */
                  if (is_intpos (optarg)) {
                        server_port = atoi (optarg);
                  }
                  else {
                        usage4 (_("Port must be a positive integer"));
                  }
                  break;
            case 'w':                                                   /* warning time threshold */
                  if (is_intnonneg (optarg)) {
                        warning_time = atoi (optarg);
                        check_warning_time = TRUE;
                  }
                  else {
                        usage4 (_("Warning time must be a positive integer"));
                  }
                  break;
            case 'c':                                                   /* critical time threshold */
                  if (is_intnonneg (optarg)) {
                        critical_time = atoi (optarg);
                        check_critical_time = TRUE;
                  }
                  else {
                        usage4 (_("Critical time must be a positive integer"));
                  }
                  break;
            case 'v':                                                   /* verbose */
                  verbose = TRUE;
                  break;
            case 't':                                                   /* timeout */
                  if (is_intnonneg (optarg)) {
                        socket_timeout = atoi (optarg);
                  }
                  else {
                        usage4 (_("Timeout interval must be a positive integer"));
                  }
                  break;
            case 'V':                                                   /* version */
                  print_revision (progname, revision);
                  exit (STATE_OK);
            case 'h':                                                   /* help */
                  print_help ();
                  exit (STATE_OK);
            case '?':                                                   /* usage */
                  usage5 ();
            }
      }

      c = optind;
      if (server_address==NULL && argc>c) {
            if (is_host (argv[c])) {
                  server_address = argv[c++];
            }
            else {
                  usage2 (_("Invalid hostname/address"), argv[c]);
            }
      }

      if (server_address==NULL)
            usage4 (_("You must provide a server to check"));

      if (host_name==NULL)
            host_name = strdup (server_address);

      if (server_expect == NULL)
            server_expect = strdup(EXPECT);

      return validate_arguments ();
}



int
validate_arguments (void)
{
      return OK;
}



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

      print_revision (progname, revision);

      printf ("Copyright (c) 1999 Pedro Leite <leite@cic.ua.pt>\n");
      printf (COPYRIGHT, copyright, email);

      printf ("%s\n", _("This plugin tests the REAL service on the specified host."));

  printf ("\n\n");

      print_usage ();

      printf (_(UT_HELP_VRSN));

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

      printf (" %s\n", "-u, --url=STRING");
  printf ("    %s\n", _("Connect to this url"));
  printf (" %s\n", "-e, --expect=STRING");
  printf (_("String to expect in first line of server response (default: %s)\n"),
             EXPECT);

      printf (_(UT_WARN_CRIT));

      printf (_(UT_TIMEOUT), DEFAULT_SOCKET_TIMEOUT);

      printf (_(UT_VERBOSE));

      printf ("%s\n", _("This plugin will attempt to open an RTSP connection with the host."));
  printf ("%s\n", _("Successul connects return STATE_OK, refusals and timeouts return"));
  printf ("%s\n", _("STATE_CRITICAL, other errors return STATE_UNKNOWN.  Successful connects,"));
  printf ("%s\n", _("but incorrect reponse messages from the host result in STATE_WARNING return"));
  printf ("%s\n", _("values."));

      printf (_(UT_SUPPORT));
}



void
print_usage (void)
{
  printf (_("Usage:"));
      printf ("%s -H host [-e expect] [-p port] [-w warn] [-c crit] [-t timeout] [-v]\n", progname);
}

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