1 files changed, 380 insertions, 0 deletions
diff --git a/plugins/check_dig.c b/plugins/check_dig.c
new file mode 100644
index 0000000..5d85ae2
--- /dev/null
+++ b/plugins/check_dig.c
@@ -0,0 +1,380 @@
+/*****************************************************************************
+* 
+* Monitoring check_dig plugin
+* 
+* License: GPL
+* Copyright (c) 2002-2008 Monitoring Plugins Development Team
+* 
+* Description:
+* 
+* This file contains the check_dig plugin
+* 
+* 
+* 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/>.
+* 
+* 
+*****************************************************************************/
+
+/* Hackers note:
+ *  There are typecasts to (char *) from _("foo bar") in this file.
+ *  They prevent compiler warnings. Never (ever), permute strings obtained
+ *  that are typecast from (const char *) (which happens when --disable-nls)
+ *  because on some architectures those strings are in non-writable memory */
+
+const char *progname = "check_dig";
+const char *copyright = "2002-2008";
+const char *email = "devel@monitoring-plugins.org";
+
+#include "common.h"
+#include "netutils.h"
+#include "utils.h"
+#include "runcmd.h"
+
+int process_arguments (int, char **);
+int validate_arguments (void);
+void print_help (void);
+void print_usage (void);
+
+#define UNDEFINED 0
+#define DEFAULT_PORT 53
+#define DEFAULT_TRIES 2
+
+char *query_address = NULL;
+char *record_type = "A";
+char *expected_address = NULL;
+char *dns_server = NULL;
+char *dig_args = "";
+char *query_transport = "";
+int verbose = FALSE;
+int server_port = DEFAULT_PORT;
+int number_tries = DEFAULT_TRIES;
+double warning_interval = UNDEFINED;
+double critical_interval = UNDEFINED;
+struct timeval tv;
+
+int
+main (int argc, char **argv)
+{
+  char *command_line;
+  output chld_out, chld_err;
+  char *msg = NULL;
+  size_t i;
+  char *t;
+  long microsec;
+  double elapsed_time;
+  int result = STATE_UNKNOWN;
+  int timeout_interval_dig;
+
+  setlocale (LC_ALL, "");
+  bindtextdomain (PACKAGE, LOCALEDIR);
+  textdomain (PACKAGE);
+
+  /* Set signal handling and alarm */
+  if (signal (SIGALRM, runcmd_timeout_alarm_handler) == SIG_ERR)
+    usage_va(_("Cannot catch SIGALRM"));
+
+  /* Parse extra opts if any */
+  argv=np_extra_opts (&argc, argv, progname);
+
+  if (process_arguments (argc, argv) == ERROR)
+    usage_va(_("Could not parse arguments"));
+
+  /* dig applies the timeout to each try, so we need to work around this */
+  timeout_interval_dig = timeout_interval / number_tries + number_tries;
+
+  /* get the command to run */
+  xasprintf (&command_line, "%s %s %s -p %d @%s %s %s +retry=%d +time=%d",
+            PATH_TO_DIG, dig_args, query_transport, server_port, dns_server, query_address, record_type, number_tries, timeout_interval_dig);
+
+  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 */
+  if(np_runcmd(command_line, &chld_out, &chld_err, 0) != 0) {
+    result = STATE_WARNING;
+    msg = (char *)_("dig returned an error status");
+  }
+
+  for(i = 0; i < chld_out.lines; i++) {
+    /* the server is responding, we just got the host name... */
+    if (strstr (chld_out.line[i], ";; ANSWER SECTION:")) {
+
+      /* loop through the whole 'ANSWER SECTION' */
+      for(; i < chld_out.lines; i++) {
+        /* get the host address */
+        if (verbose)
+          printf ("%s\n", chld_out.line[i]);
+
+        if (strcasestr (chld_out.line[i], (expected_address == NULL ? query_address : expected_address)) != NULL) {
+          msg = chld_out.line[i];
+          result = STATE_OK;
+
+          /* Translate output TAB -> SPACE */
+          t = msg;
+          while ((t = strchr(t, '\t')) != NULL) *t = ' ';
+          break;
+        }
+      }
+
+      if (result == STATE_UNKNOWN) {
+        msg = (char *)_("Server not found in ANSWER SECTION");
+        result = STATE_WARNING;
+      }
+
+      /* we found the answer section, so break out of the loop */
+      break;
+    }
+  }
+
+  if (result == STATE_UNKNOWN) {
+    msg = (char *)_("No ANSWER SECTION found");
+    result = STATE_CRITICAL;
+  }
+
+  /* If we get anything on STDERR, at least set warning */
+  if(chld_err.buflen > 0) {
+    result = max_state(result, STATE_WARNING);
+    if(!msg) for(i = 0; i < chld_err.lines; i++) {
+      msg = strchr(chld_err.line[0], ':');
+      if(msg) {
+        msg++;
+        break;
+      }
+    }
+  }
+
+  microsec = deltime (tv);
+  elapsed_time = (double)microsec / 1.0e6;
+
+  if (critical_interval > UNDEFINED && elapsed_time > critical_interval)
+    result = STATE_CRITICAL;
+
+  else if (warning_interval > UNDEFINED && elapsed_time > warning_interval)
+    result = STATE_WARNING;
+
+  printf ("DNS %s - %.3f seconds response time (%s)|%s\n",
+          state_text (result), elapsed_time,
+          msg ? msg : _("Probably a non-existent host/domain"),
+          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'},
+    {"dig-arguments", required_argument, 0, 'A'},
+    {"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'},
+    {"port", required_argument, 0, 'p'},
+    {"use-ipv4", no_argument, 0, '4'},
+    {"use-ipv6", no_argument, 0, '6'},
+    {0, 0, 0, 0}
+  };
+
+  if (argc < 2)
+    return ERROR;
+
+  while (1) {
+    c = getopt_long (argc, argv, "hVvt:l:H:w:c:T:p:a:A:46", longopts, &option);
+
+    if (c == -1 || c == EOF)
+      break;
+
+    switch (c) {
+    case 'h':                 /* help */
+      print_help ();
+      exit (STATE_UNKNOWN);
+    case 'V':                 /* version */
+      print_revision (progname, NP_VERSION);
+      exit (STATE_UNKNOWN);
+    case 'H':                 /* hostname */
+      host_or_die(optarg);
+      dns_server = optarg;
+      break;
+    case 'p':                 /* server port */
+      if (is_intpos (optarg)) {
+        server_port = atoi (optarg);
+      }
+      else {
+        usage_va(_("Port must be a positive integer - %s"), optarg);
+      }
+      break;
+    case 'l':                 /* address to lookup */
+      query_address = optarg;
+      break;
+    case 'w':                 /* warning */
+      if (is_nonnegative (optarg)) {
+        warning_interval = strtod (optarg, NULL);
+      }
+      else {
+        usage_va(_("Warning interval must be a positive integer - %s"), optarg);
+      }
+      break;
+    case 'c':                 /* critical */
+      if (is_nonnegative (optarg)) {
+        critical_interval = strtod (optarg, NULL);
+      }
+      else {
+        usage_va(_("Critical interval must be a positive integer - %s"), optarg);
+      }
+      break;
+    case 't':                 /* timeout */
+      if (is_intnonneg (optarg)) {
+        timeout_interval = atoi (optarg);
+      }
+      else {
+        usage_va(_("Timeout interval must be a positive integer - %s"), optarg);
+      }
+      break;
+    case 'A':                 /* dig arguments */
+      dig_args = strdup(optarg);
+      break;
+    case 'v':                 /* verbose */
+      verbose = TRUE;
+      break;
+    case 'T':
+      record_type = optarg;
+      break;
+    case 'a':
+      expected_address = optarg;
+      break;
+    case '4':
+      query_transport = "-4";
+      break;
+    case '6':
+      query_transport = "-6";
+      break;
+    default:                  /* usage5 */
+      usage5();
+    }
+  }
+
+  c = optind;
+  if (dns_server == NULL) {
+    if (c < argc) {
+      host_or_die(argv[c]);
+      dns_server = argv[c];
+    }
+    else {
+      if (strcmp(query_transport,"-6") == 0)
+        dns_server = strdup("::1");
+      else
+        dns_server = strdup ("127.0.0.1");
+    }
+  }
+
+  return validate_arguments ();
+}
+
+
+
+int
+validate_arguments (void)
+{
+  if (query_address != NULL)
+    return OK;
+  else
+    return ERROR;
+}
+
+
+
+void
+print_help (void)
+{
+  char *myport;
+
+  xasprintf (&myport, "%d", DEFAULT_PORT);
+
+  print_revision (progname, NP_VERSION);
+
+  printf ("Copyright (c) 2000 Karl DeBisschop <kdebisschop@users.sourceforge.net>\n");
+  printf (COPYRIGHT, copyright, email);
+
+  printf (_("This plugin tests the DNS service on the specified host using dig"));
+
+  printf ("\n\n");
+
+  print_usage ();
+
+  printf (UT_HELP_VRSN);
+
+  printf (UT_EXTRA_OPTS);
+
+  printf (UT_HOST_PORT, 'p', myport);
+
+  printf (" %s\n","-4, --use-ipv4");
+  printf ("    %s\n",_("Force dig to only use IPv4 query transport"));
+  printf (" %s\n","-6, --use-ipv6");
+  printf ("    %s\n",_("Force dig to only use IPv6 query transport"));
+  printf (" %s\n","-l, --query_address=STRING");
+  printf ("    %s\n",_("Machine name to lookup"));
+  printf (" %s\n","-T, --record_type=STRING");
+  printf ("    %s\n",_("Record type to lookup (default: A)"));
+  printf (" %s\n","-a, --expected_address=STRING");
+  printf ("    %s\n",_("An address expected to be in the answer section. If not set, uses whatever"));
+  printf ("    %s\n",_("was in -l"));
+  printf (" %s\n","-A, --dig-arguments=STRING");
+  printf ("    %s\n",_("Pass STRING as argument(s) to dig"));
+  printf (UT_WARN_CRIT);
+  printf (UT_CONN_TIMEOUT, DEFAULT_SOCKET_TIMEOUT);
+  printf (UT_VERBOSE);
+
+  printf ("\n");
+  printf ("%s\n", _("Examples:"));
+  printf (" %s\n", "check_dig -H DNSSERVER -l www.example.com -A \"+tcp\"");
+  printf (" %s\n", "This will send a tcp query to DNSSERVER for www.example.com");
+
+  printf (UT_SUPPORT);
+}
+
+
+
+void
+print_usage (void)
+{
+  printf ("%s\n", _("Usage:"));
+  printf ("%s -l <query_address> [-H <host>] [-p <server port>]\n", progname);
+  printf (" [-T <query type>] [-w <warning interval>] [-c <critical interval>]\n");
+  printf (" [-t <timeout>] [-a <expected answer address>] [-v]\n");
+}