plugins/check_dig.c

   1 /*****************************************************************************
   2
   3  This program is free software; you can redistribute it and/or modify
   4  it under the terms of the GNU General Public License as published by
   5  the Free Software Foundation; either version 2 of the License, or
   6  (at your option) any later version.
   7
   8  This program is distributed in the hope that it will be useful,
   9  but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11  GNU General Public License for more details.
  12
  13  You should have received a copy of the GNU General Public License
  14  along with this program; if not, write to the Free Software
  15  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  16
  17  $Id$
  18
  19 *****************************************************************************/
  20
  21 /* Hackers note:
  22  *  There are typecasts to (char *) from _("foo bar") in this file.
  23  *  They prevent compiler warnings. Never (ever), permute strings obtained
  24  *  that are typecast from (const char *) (which happens when --disable-nls)
  25  *  because on some architectures those strings are in non-writable memory */
  26
  27 const char *progname = "check_dig";
  28 const char *revision = "$Revision$";
  29 const char *copyright = "2002-2005";
  30 const char *email = "nagiosplug-devel@lists.sourceforge.net";
  31
  32 #include "common.h"
  33 #include "netutils.h"
  34 #include "utils.h"
  35 #include "runcmd.h"
  36
  37 int process_arguments (int, char **);
  38 int validate_arguments (void);
  39 void print_help (void);
  40 void print_usage (void);
  41
  42 #define UNDEFINED 0
  43 #define DEFAULT_PORT 53
  44
  45 char *query_address = NULL;
  46 char *record_type = "A";
  47 char *expected_address = NULL;
  48 char *dns_server = NULL;
  49 int verbose = FALSE;
  50 int server_port = DEFAULT_PORT;
  51 double warning_interval = UNDEFINED;
  52 double critical_interval = UNDEFINED;
  53 struct timeval tv;
  54
  55 int
  56 main (int argc, char **argv)
  57 {
  58   char *command_line;
  59   output chld_out, chld_err;
  60   char *msg = NULL;
  61   size_t i;
  62   char *t;
  63   long microsec;
  64   double elapsed_time;
  65   int result = STATE_UNKNOWN;
  66
  67   setlocale (LC_ALL, "");
  68   bindtextdomain (PACKAGE, LOCALEDIR);
  69   textdomain (PACKAGE);
  70
  71   /* Set signal handling and alarm */
  72   if (signal (SIGALRM, popen_timeout_alarm_handler) == SIG_ERR)
  73     usage_va(_("Cannot catch SIGALRM"));
  74
  75   if (process_arguments (argc, argv) == ERROR)
  76     usage_va(_("Could not parse arguments"));
  77
  78   /* get the command to run */
  79   asprintf (&command_line, "%s @%s -p %d %s -t %s",
  80             PATH_TO_DIG, dns_server, server_port, query_address, record_type);
  81
  82   alarm (timeout_interval);
  83   gettimeofday (&tv, NULL);
  84
  85   if (verbose) {
  86     printf ("%s\n", command_line);
  87     if(expected_address != NULL) {
  88       printf (_("Looking for: '%s'\n"), expected_address);
  89     } else {
  90       printf (_("Looking for: '%s'\n"), query_address);
  91     }
  92   }
  93
  94   /* run the command */
  95   if(np_runcmd(command_line, &chld_out, &chld_err, 0) != 0) {
  96     result = STATE_WARNING;
  97     msg = (char *)_("dig returned an error status");
  98   }
  99
 100   for(i = 0; i < chld_out.lines; i++) {
 101     /* the server is responding, we just got the host name... */
 102     if (strstr (chld_out.line[i], ";; ANSWER SECTION:")) {
 103
 104       /* loop through the whole 'ANSWER SECTION' */
 105       for(; i < chld_out.lines; i++) {
 106         /* get the host address */
 107         if (verbose)
 108           printf ("%s\n", chld_out.line[i]);
 109
 110         if (strstr (chld_out.line[i], (expected_address == NULL ? query_address : expected_address)) != NULL) {
 111           msg = chld_out.line[i];
 112           result = STATE_OK;
 113
 114           /* Translate output TAB -> SPACE */
 115           t = msg;
 116           while ((t = strchr(t, '\t')) != NULL) *t = ' ';
 117           break;
 118         }
 119       }
 120
 121       if (result == STATE_UNKNOWN) {
 122         msg = (char *)_("Server not found in ANSWER SECTION");
 123         result = STATE_WARNING;
 124       }
 125
 126       /* we found the answer section, so break out of the loop */
 127       break;
 128     }
 129   }
 130
 131   if (result == STATE_UNKNOWN)
 132     msg = (char *)_("No ANSWER SECTION found");
 133
 134   /* If we get anything on STDERR, at least set warning */
 135   if(chld_err.buflen > 0) {
 136     result = max_state(result, STATE_WARNING);
 137     if(!msg) for(i = 0; i < chld_err.lines; i++) {
 138       msg = strchr(chld_err.line[0], ':');
 139       if(msg) {
 140         msg++;
 141         break;
 142       }
 143     }
 144   }
 145
 146   microsec = deltime (tv);
 147   elapsed_time = (double)microsec / 1.0e6;
 148
 149   if (critical_interval > UNDEFINED && elapsed_time > critical_interval)
 150     result = STATE_CRITICAL;
 151
 152   else if (warning_interval > UNDEFINED && elapsed_time > warning_interval)
 153     result = STATE_WARNING;
 154
 155   printf ("DNS %s - %.3f seconds response time (%s)|%s\n",
 156           state_text (result), elapsed_time,
 157           msg ? msg : _("Probably a non-existent host/domain"),
 158           fperfdata("time", elapsed_time, "s",
 159                     (warning_interval>UNDEFINED?TRUE:FALSE),
 160                     warning_interval,
 161                     (critical_interval>UNDEFINED?TRUE:FALSE),
 162             critical_interval,
 163             TRUE, 0, FALSE, 0));
 164   return result;
 165 }
 166
 167
 168
 169 /* process command-line arguments */
 170 int
 171 process_arguments (int argc, char **argv)
 172 {
 173   int c;
 174
 175   int option = 0;
 176   static struct option longopts[] = {
 177     {"hostname", required_argument, 0, 'H'},
 178     {"query_address", required_argument, 0, 'l'},
 179     {"warning", required_argument, 0, 'w'},
 180     {"critical", required_argument, 0, 'c'},
 181     {"timeout", required_argument, 0, 't'},
 182     {"verbose", no_argument, 0, 'v'},
 183     {"version", no_argument, 0, 'V'},
 184     {"help", no_argument, 0, 'h'},
 185     {"record_type", required_argument, 0, 'T'},
 186     {"expected_address", required_argument, 0, 'a'},
 187     {0, 0, 0, 0}
 188   };
 189
 190   if (argc < 2)
 191     return ERROR;
 192
 193   while (1) {
 194     c = getopt_long (argc, argv, "hVvt:l:H:w:c:T:a:", longopts, &option);
 195
 196     if (c == -1 || c == EOF)
 197       break;
 198
 199     switch (c) {
 200     case 'h':                 /* help */
 201       print_help ();
 202       exit (STATE_OK);
 203     case 'V':                 /* version */
 204       print_revision (progname, revision);
 205       exit (STATE_OK);
 206     case 'H':                 /* hostname */
 207       host_or_die(optarg);
 208       dns_server = optarg;
 209       break;
 210     case 'p':                 /* server port */
 211       if (is_intpos (optarg)) {
 212         server_port = atoi (optarg);
 213       }
 214       else {
 215         usage_va(_("Port must be a positive integer - %s"), optarg);
 216       }
 217       break;
 218     case 'l':                 /* address to lookup */
 219       query_address = optarg;
 220       break;
 221     case 'w':                 /* warning */
 222       if (is_nonnegative (optarg)) {
 223         warning_interval = strtod (optarg, NULL);
 224       }
 225       else {
 226         usage_va(_("Warning interval must be a positive integer - %s"), optarg);
 227       }
 228       break;
 229     case 'c':                 /* critical */
 230       if (is_nonnegative (optarg)) {
 231         critical_interval = strtod (optarg, NULL);
 232       }
 233       else {
 234         usage_va(_("Critical interval must be a positive integer - %s"), optarg);
 235       }
 236       break;
 237     case 't':                 /* timeout */
 238       if (is_intnonneg (optarg)) {
 239         timeout_interval = atoi (optarg);
 240       }
 241       else {
 242         usage_va(_("Timeout interval must be a positive integer - %s"), optarg);
 243       }
 244       break;
 245     case 'v':                 /* verbose */
 246       verbose = TRUE;
 247       break;
 248     case 'T':
 249       record_type = optarg;
 250       break;
 251     case 'a':
 252       expected_address = optarg;
 253       break;
 254     default:                  /* usage_va */
 255       usage_va(_("Unknown argument - %s"), optarg);
 256     }
 257   }
 258
 259   c = optind;
 260   if (dns_server == NULL) {
 261     if (c < argc) {
 262       host_or_die(argv[c]);
 263       dns_server = argv[c];
 264     }
 265     else {
 266       dns_server = strdup ("127.0.0.1");
 267     }
 268   }
 269
 270   return validate_arguments ();
 271 }
 272
 273
 274
 275 int
 276 validate_arguments (void)
 277 {
 278   return OK;
 279 }
 280
 281
 282
 283 void
 284 print_help (void)
 285 {
 286   char *myport;
 287
 288   asprintf (&myport, "%d", DEFAULT_PORT);
 289
 290   print_revision (progname, revision);
 291
 292   printf ("Copyright (c) 2000 Karl DeBisschop <kdebisschop@users.sourceforge.net>\n");
 293   printf (COPYRIGHT, copyright, email);
 294
 295   printf (_("This plugin test the DNS service on the specified host using dig"));
 296
 297   printf ("\n\n");
 298
 299   print_usage ();
 300
 301   printf (_(UT_HELP_VRSN));
 302
 303   printf (_(UT_HOST_PORT), 'P', myport);
 304
 305   printf ("-l, --lookup=STRING");
 306
 307   printf ("\n");
 308
 309   printf (_("machine name to lookup"));
 310
 311   printf ("\n");
 312
 313   printf ("-T, --record_type=STRING");
 314
 315   printf ("\n");
 316
 317   printf (_("record type to lookup (default: A)"));
 318
 319   printf ("\n");
 320
 321   printf ("-a, --expected_address=STRING");
 322
 323   printf ("\n");
 324
 325   printf (_("an address expected to be in the answer section.if not set, uses whatever was in -l"));
 326
 327   printf ("\n");
 328
 329   printf (_(UT_WARN_CRIT));
 330
 331   printf (_(UT_TIMEOUT), DEFAULT_SOCKET_TIMEOUT);
 332
 333   printf (_(UT_VERBOSE));
 334
 335   printf (_(UT_SUPPORT));
 336 }
 337
 338
 339
 340 void
 341 print_usage (void)
 342 {
 343   printf (_("Usage:"));
 344   printf ("%s -H host -l lookup [-p <server port>] [-T <query type>]", progname);
 345   printf ("          [-w <warning interval>] [-c <critical interval>] [-t <timeout>]");
 346   printf ("          [-a <expected answer address>] [-v]\n");
 347 }