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 *****************************************************************************/
  18
  19 #include "common.h"
  20 #include "netutils.h"
  21 #include "utils.h"
  22 #include "popen.h"
  23
  24 int process_arguments (int, char **);
  25 int validate_arguments (void);
  26 void print_help (void);
  27 void print_usage (void);
  28
  29 const char *progname = "check_dig";
  30 const char *revision = "$Revision$";
  31 const char *copyright = "2002-2003";
  32 const char *email = "nagiosplug-devel@lists.sourceforge.net";
  33
  34 enum {
  35         UNDEFINED = 0,
  36         DEFAULT_PORT = 53
  37 };
  38
  39 char *query_address = NULL;
  40 char *record_type = "A";
  41 char *expected_address = NULL;
  42 char *dns_server = NULL;
  43 int verbose = FALSE;
  44 int server_port = DEFAULT_PORT;
  45 double warning_interval = UNDEFINED;
  46 double critical_interval = UNDEFINED;
  47 struct timeval tv;
  48
  49 int
  50 main (int argc, char **argv)
  51 {
  52         char input_buffer[MAX_INPUT_BUFFER];
  53         char *command_line;
  54         char *output;
  55         long microsec;
  56         double elapsed_time;
  57         int result = STATE_UNKNOWN;
  58
  59         output = strdup ("");
  60
  61         setlocale (LC_ALL, "");
  62         bindtextdomain (PACKAGE, LOCALEDIR);
  63         textdomain (PACKAGE);
  64
  65         /* Set signal handling and alarm */
  66         if (signal (SIGALRM, popen_timeout_alarm_handler) == SIG_ERR)
  67                 usage (_("Cannot catch SIGALRM\n"));
  68
  69         if (process_arguments (argc, argv) != OK)
  70                 usage (_("Could not parse arguments\n"));
  71
  72         /* get the command to run */
  73         asprintf (&command_line, "%s @%s -p %d %s -t %s",
  74                   PATH_TO_DIG, dns_server, server_port, query_address, record_type);
  75
  76         alarm (timeout_interval);
  77         gettimeofday (&tv, NULL);
  78
  79         if (verbose) {
  80                 printf ("%s\n", command_line);
  81                 if(expected_address != NULL) {
  82                         printf ("Looking for: '%s'\n", expected_address);
  83                 } else {
  84                         printf ("Looking for: '%s'\n", query_address);
  85                 }
  86         }
  87
  88         /* run the command */
  89         child_process = spopen (command_line);
  90         if (child_process == NULL) {
  91                 printf (_("Could not open pipe: %s\n"), command_line);
  92                 return STATE_UNKNOWN;
  93         }
  94
  95         child_stderr = fdopen (child_stderr_array[fileno (child_process)], "r");
  96         if (child_stderr == NULL)
  97                 printf (_("Could not open stderr for %s\n"), command_line);
  98
  99         while (fgets (input_buffer, MAX_INPUT_BUFFER - 1, child_process)) {
 100
 101                 /* the server is responding, we just got the host name... */
 102                 if (strstr (input_buffer, ";; ANSWER SECTION:")) {
 103
 104                         /* loop through the whole 'ANSWER SECTION' */
 105                         do {
 106                                 /* get the host address */
 107                                 if (!fgets (input_buffer, MAX_INPUT_BUFFER - 1, child_process))
 108                                         break;
 109
 110                                 if (strpbrk (input_buffer, "\r\n"))
 111                                         input_buffer[strcspn (input_buffer, "\r\n")] = '\0';
 112
 113                                 if (verbose && !strstr (input_buffer, ";; "))
 114                                         printf ("%s\n", input_buffer);
 115
 116                                 if (expected_address==NULL && strstr (input_buffer, query_address) != NULL) {
 117                                         output = strdup(input_buffer);
 118                                         result = STATE_OK;
 119                                 }
 120                                 else if (expected_address != NULL && strstr (input_buffer, expected_address) != NULL) {
 121                                         output = strdup(input_buffer);
 122                                         result = STATE_OK;
 123                                 }
 124
 125                         } while (!strstr (input_buffer, ";; "));
 126
 127                         if (result == STATE_UNKNOWN) {
 128                                 asprintf (&output, _("Server not found in ANSWER SECTION"));
 129                                 result = STATE_WARNING;
 130                         }
 131
 132                 }
 133
 134         }
 135
 136         if (result == STATE_UNKNOWN) {
 137                 asprintf (&output, _("No ANSWER SECTION found"));
 138         }
 139
 140         while (fgets (input_buffer, MAX_INPUT_BUFFER - 1, child_stderr)) {
 141                 /* If we get anything on STDERR, at least set warning */
 142                 result = max_state (result, STATE_WARNING);
 143                 printf ("%s", input_buffer);
 144                 if (strlen (output) == 0)
 145                         output = strdup (1 + index (input_buffer, ':'));
 146         }
 147
 148         (void) fclose (child_stderr);
 149
 150         /* close the pipe */
 151         if (spclose (child_process)) {
 152                 result = max_state (result, STATE_WARNING);
 153                 if (strlen (output) == 0)
 154                         asprintf (&output, _("dig returned error status"));
 155         }
 156
 157         microsec = deltime (tv);
 158         elapsed_time = (double)microsec / 1.0e6;
 159
 160         if (output == NULL || strlen (output) == 0)
 161                 asprintf (&output, _(" Probably a non-existent host/domain"));
 162
 163         if (critical_interval > UNDEFINED && elapsed_time > critical_interval)
 164                 result = STATE_CRITICAL;
 165
 166         else if (warning_interval > UNDEFINED && elapsed_time > warning_interval)
 167                 result = STATE_WARNING;
 168
 169         asprintf (&output, _("%.3f seconds response time (%s)"), elapsed_time, output);
 170
 171         printf ("DNS %s - %s|%s\n",
 172                 state_text (result), output,
 173                 fperfdata("time", elapsed_time, "s",
 174                          (warning_interval>UNDEFINED?TRUE:FALSE),
 175                          warning_interval,
 176                          (critical_interval>UNDEFINED?TRUE:FALSE),
 177                          critical_interval,
 178                                                                          TRUE, 0, FALSE, 0));
 179         return result;
 180 }
 181
 182
 183
 184
 185
 186 \f
 187 /* process command-line arguments */
 188 int
 189 process_arguments (int argc, char **argv)
 190 {
 191         int c;
 192
 193         int option = 0;
 194         static struct option longopts[] = {
 195                 {"hostname", required_argument, 0, 'H'},
 196                 {"query_address", required_argument, 0, 'l'},
 197                 {"warning", required_argument, 0, 'w'},
 198                 {"critical", required_argument, 0, 'c'},
 199                 {"timeout", required_argument, 0, 't'},
 200                 {"verbose", no_argument, 0, 'v'},
 201                 {"version", no_argument, 0, 'V'},
 202                 {"help", no_argument, 0, 'h'},
 203                 {"record_type", required_argument, 0, 'T'},
 204                 {"expected_address", required_argument, 0, 'a'},
 205                 {0, 0, 0, 0}
 206         };
 207
 208         if (argc < 2)
 209                 return ERROR;
 210
 211         while (1) {
 212                 c = getopt_long (argc, argv, "hVvt:l:H:w:c:T:a:", longopts, &option);
 213
 214                 if (c == -1 || c == EOF)
 215                         break;
 216
 217                 switch (c) {
 218                 case '?':                                                                       /* help */
 219                         usage3 (_("Unknown argument"), optopt);
 220                 case 'h':                                                                       /* help */
 221                         print_help ();
 222                         exit (STATE_OK);
 223                 case 'V':                                                                       /* version */
 224                         print_revision (progname, "$Revision$");
 225                         exit (STATE_OK);
 226                 case 'H':                                                                       /* hostname */
 227                         if (is_host (optarg)) {
 228                                 dns_server = optarg;
 229                         }
 230                         else {
 231                                 usage2 (_("Invalid host name"), optarg);
 232                         }
 233                         break;
 234                 case 'p':                 /* server port */
 235                         if (is_intpos (optarg)) {
 236                                 server_port = atoi (optarg);
 237                         }
 238                         else {
 239                                 usage2 (_("Server port must be a nonnegative integer"), optarg);
 240                         }
 241                         break;
 242                 case 'l':                                                                       /* address to lookup */
 243                         query_address = optarg;
 244                         break;
 245                 case 'w':                                                                       /* warning */
 246                         if (is_nonnegative (optarg)) {
 247                                 warning_interval = strtod (optarg, NULL);
 248                         }
 249                         else {
 250                                 usage2 (_("Warning interval must be a nonnegative integer"), optarg);
 251                         }
 252                         break;
 253                 case 'c':                                                                       /* critical */
 254                         if (is_nonnegative (optarg)) {
 255                                 critical_interval = strtod (optarg, NULL);
 256                         }
 257                         else {
 258                                 usage2 (_("Critical interval must be a nonnegative integer"), optarg);
 259                         }
 260                         break;
 261                 case 't':                                                                       /* timeout */
 262                         if (is_intnonneg (optarg)) {
 263                                 timeout_interval = atoi (optarg);
 264                         }
 265                         else {
 266                                 usage2 (_("Time interval must be a nonnegative integer"), optarg);
 267                         }
 268                         break;
 269                 case 'v':                                                                       /* verbose */
 270                         verbose = TRUE;
 271                         break;
 272                 case 'T':
 273                         record_type = optarg;
 274                         break;
 275                 case 'a':
 276                         expected_address = optarg;
 277                         break;
 278                 }
 279         }
 280
 281         c = optind;
 282         if (dns_server == NULL) {
 283                 if (c < argc) {
 284                         if (is_host (argv[c])) {
 285                                 dns_server = argv[c];
 286                         }
 287                         else {
 288                                 usage2 (_("Invalid host name"), argv[c]);
 289                         }
 290                 }
 291                 else {
 292                         dns_server = strdup ("127.0.0.1");
 293                 }
 294         }
 295
 296         return validate_arguments ();
 297 }
 298
 299
 300
 301
 302
 303 int
 304 validate_arguments (void)
 305 {
 306         return OK;
 307 }
 308
 309
 310
 311
 312
 313
 314 \f
 315 void
 316 print_help (void)
 317 {
 318         char *myport;
 319
 320         asprintf (&myport, "%d", DEFAULT_PORT);
 321
 322         print_revision (progname, revision);
 323
 324         printf (_("Copyright (c) 2000 Karl DeBisschop <kdebisschop@users.sourceforge.net>\n"));
 325         printf (_(COPYRIGHT), copyright, email);
 326
 327         printf (_("Test the DNS service on the specified host using dig\n\n"));
 328
 329         print_usage ();
 330
 331         printf (_(UT_HELP_VRSN));
 332
 333         printf (_(UT_HOST_PORT), 'P', myport);
 334
 335         printf (_("\
 336  -l, --lookup=STRING\n\
 337    machine name to lookup\n"));
 338
 339         printf (_("\
 340  -T, --record_type=STRING\n\
 341    record type to lookup (default: A)\n"));
 342
 343         printf (_("\
 344  -a, --expected_address=STRING\n\
 345    an address expected to be in the asnwer section.\n\
 346    if not set, uses whatever was in -l\n"));
 347
 348         printf (_(UT_WARN_CRIT));
 349
 350         printf (_(UT_TIMEOUT), DEFAULT_SOCKET_TIMEOUT);
 351
 352         printf (_(UT_VERBOSE));
 353
 354         printf (_(UT_SUPPORT));
 355 }
 356
 357
 358
 359
 360 void
 361 print_usage (void)
 362 {
 363         printf (_("\
 364 Usage: %s -H host -l lookup [-p <server port>] [-T <query type>]\n\
 365          [-w <warning interval>] [-c <critical interval>] [-t <timeout>]\n\
 366          [-a <expected answer address>] [-v]\n"),
 367                 progname);
 368         printf ("       %s (-h|--help)\n", progname);
 369         printf ("       %s (-V|--version)\n", progname);
 370 }