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Sourcecode: nagios-plugins version File versions

check_dig.c

/*****************************************************************************

 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_dig.c,v 1.40 2005/01/26 21:21:01 tonvoon Exp $
 
*****************************************************************************/

const char *progname = "check_dig";
const char *revision = "$Revision: 1.40 $";
const char *copyright = "2002-2004";
const char *email = "nagiosplug-devel@lists.sourceforge.net";

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

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

enum {
      UNDEFINED = 0,
      DEFAULT_PORT = 53
};

char *query_address = NULL;
char *record_type = "A";
char *expected_address = NULL;
char *dns_server = NULL;
int verbose = FALSE;
int server_port = DEFAULT_PORT;
double warning_interval = UNDEFINED;
double critical_interval = UNDEFINED;
struct timeval tv;

int
main (int argc, char **argv)
{
      char input_buffer[MAX_INPUT_BUFFER];
      char *command_line;
      char *output;
      char *t;
      long microsec;
      double elapsed_time;
      int result = STATE_UNKNOWN;

      output = strdup ("");

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

      /* Set signal handling and alarm */
      if (signal (SIGALRM, popen_timeout_alarm_handler) == SIG_ERR)
            usage4 (_("Cannot catch SIGALRM"));

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

      /* get the command to run */
      asprintf (&command_line, "%s @%s -p %d %s -t %s",
                PATH_TO_DIG, dns_server, server_port, query_address, record_type);

      alarm (timeout_interval);
      gettimeofday (&tv, NULL);

      if (verbose) {
            printf ("%s\n", command_line);
            if(expected_address != NULL) {
                  printf (_("Looking for: '%s'\n"), expected_address);
            } else {
                  printf (_("Looking for: '%s'\n"), query_address);
            }
      }

      /* run the command */
      child_process = spopen (command_line);
      if (child_process == NULL) {
            printf (_("Could not open pipe: %s\n"), command_line);
            return STATE_UNKNOWN;
      }

      child_stderr = fdopen (child_stderr_array[fileno (child_process)], "r");
      if (child_stderr == NULL)
            printf (_("Could not open stderr for %s\n"), command_line);

      while (fgets (input_buffer, MAX_INPUT_BUFFER - 1, child_process)) {

            /* the server is responding, we just got the host name... */
            if (strstr (input_buffer, ";; ANSWER SECTION:")) {

                  /* loop through the whole 'ANSWER SECTION' */
                  do {
                        /* get the host address */
                        if (!fgets (input_buffer, MAX_INPUT_BUFFER - 1, child_process))
                              break;

                        if (strpbrk (input_buffer, "\r\n"))
                              input_buffer[strcspn (input_buffer, "\r\n")] = '\0';

                        if (verbose && !strstr (input_buffer, ";; ")) 
                              printf ("%s\n", input_buffer); 

                        if (expected_address==NULL && strstr (input_buffer, query_address) != NULL) {
                              output = strdup(input_buffer);
                              result = STATE_OK;
                        }
                        else if (expected_address != NULL && strstr (input_buffer, expected_address) != NULL) {
                              output = strdup(input_buffer);
                                      result = STATE_OK;
                        }

                        /* Translate output TAB -> SPACE */
                        t = output;
                        while ((t = index(t, '\t')) != NULL) 
                              *t = ' ';

                  } while (!strstr (input_buffer, ";; "));

                  if (result == STATE_UNKNOWN) {
                        asprintf (&output, _("Server not found in ANSWER SECTION"));
                              result = STATE_WARNING;
                        }
            }

      }

      if (result == STATE_UNKNOWN) {
            asprintf (&output, _("No ANSWER SECTION found"));
      }

      while (fgets (input_buffer, MAX_INPUT_BUFFER - 1, child_stderr)) {
            /* If we get anything on STDERR, at least set warning */
            result = max_state (result, STATE_WARNING);
            printf ("%s", input_buffer);
            if (strlen (output) == 0)
                  output = strdup (1 + index (input_buffer, ':'));
      }

      (void) fclose (child_stderr);

      /* close the pipe */
      if (spclose (child_process)) {
            result = max_state (result, STATE_WARNING);
            if (strlen (output) == 0)
                  asprintf (&output, _("dig returned an error status"));
      }

      microsec = deltime (tv);
      elapsed_time = (double)microsec / 1.0e6;

      if (output == NULL || strlen (output) == 0)
            asprintf (&output, _(" Probably a non-existent host/domain"));

      if (critical_interval > UNDEFINED && elapsed_time > critical_interval)
            result = STATE_CRITICAL;

      else if (warning_interval > UNDEFINED && elapsed_time > warning_interval)
            result = STATE_WARNING;

      asprintf (&output, _("%.3f seconds response time (%s)"), elapsed_time, output);

      printf ("DNS %s - %s|%s\n",
              state_text (result), output,
              fperfdata("time", elapsed_time, "s",
                       (warning_interval>UNDEFINED?TRUE:FALSE),
                       warning_interval,
                       (critical_interval>UNDEFINED?TRUE:FALSE),
                       critical_interval,
                                                       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'},
            {"query_address", required_argument, 0, 'l'},
            {"warning", required_argument, 0, 'w'},
            {"critical", required_argument, 0, 'c'},
            {"timeout", required_argument, 0, 't'},
            {"verbose", no_argument, 0, 'v'},
            {"version", no_argument, 0, 'V'},
            {"help", no_argument, 0, 'h'},
            {"record_type", required_argument, 0, 'T'},
            {"expected_address", required_argument, 0, 'a'},
            {0, 0, 0, 0}
      };

      if (argc < 2)
            return ERROR;

      while (1) {
            c = getopt_long (argc, argv, "hVvt:l:H:w:c:T:a:", longopts, &option);

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

            switch (c) {
            case '?':                                                   /* help */
                  usage2 (_("Unknown argument"), optarg);
            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)) {
                        dns_server = optarg;
                  }
                  else {
                        usage2 (_("Invalid hostname/address"), optarg);
                  }
                  break;
            case 'p':                 /* server port */
                  if (is_intpos (optarg)) {
                        server_port = atoi (optarg);
                  }
                  else {
                        usage2 (_("Port must be a positive integer"), optarg);
                  }
                  break;
            case 'l':                                                   /* address to lookup */
                  query_address = optarg;
                  break;
            case 'w':                                                   /* warning */
                  if (is_nonnegative (optarg)) {
                        warning_interval = strtod (optarg, NULL);
                  }
                  else {
                        usage2 (_("Warning interval must be a positive integer"), optarg);
                  }
                  break;
            case 'c':                                                   /* critical */
                  if (is_nonnegative (optarg)) {
                        critical_interval = strtod (optarg, NULL);
                  }
                  else {
                        usage2 (_("Critical interval must be a positive integer"), optarg);
                  }
                  break;
            case 't':                                                   /* timeout */
                  if (is_intnonneg (optarg)) {
                        timeout_interval = atoi (optarg);
                  }
                  else {
                        usage2 (_("Timeout interval must be a positive integer"), optarg);
                  }
                  break;
            case 'v':                                                   /* verbose */
                  verbose = TRUE;
                  break;
            case 'T':
                  record_type = optarg;
                  break;
            case 'a':
                  expected_address = optarg;
                  break;
            }
      }

      c = optind;
      if (dns_server == NULL) {
            if (c < argc) {
                  if (is_host (argv[c])) {
                        dns_server = argv[c];
                  }
                  else {
                        usage2 (_("Invalid hostname/address"), argv[c]);
                  }
            }
            else {
                  dns_server = strdup ("127.0.0.1");
            }
      }

      return validate_arguments ();
}



int
validate_arguments (void)
{
      return OK;
}



void
print_help (void)
{
      char *myport;

      asprintf (&myport, "%d", DEFAULT_PORT);

      print_revision (progname, revision);

      printf ("Copyright (c) 2000 Karl DeBisschop <kdebisschop@users.sourceforge.net>\n");
      printf (COPYRIGHT, copyright, email);

      printf (_("Test the DNS service on the specified host using dig\n\n"));

      print_usage ();

      printf (_(UT_HELP_VRSN));

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

      printf (_("\
 -l, --lookup=STRING\n\
   machine name to lookup\n"));

        printf (_("\
 -T, --record_type=STRING\n\
   record type to lookup (default: A)\n"));

        printf (_("\
 -a, --expected_address=STRING\n\
   an address expected to be in the answer section.\n\
   if not set, uses whatever was in -l\n"));

      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 -l lookup [-p <server port>] [-T <query type>]\n\
                  [-w <warning interval>] [-c <critical interval>] [-t <timeout>]\n\
                  [-a <expected answer address>] [-v]\n", progname);
}

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