plugins/check_time.c

   1 /******************************************************************************
   2 *
   3 * CHECK_TIME.C
   4 *
   5 * Program: Network time server plugin for Nagios
   6 * License: GPL
   7 * Copyright (c) 1999 Ethan Galstad (nagios@nagios.org)
   8 * Copyright (c) 2000 Karl DeBisschop (kdebisschop@users.sourceforge.net)
   9 *
  10 * $Id$
  11 *
  12 * Description:
  13 *
  14 * This plugin will attempt to connect to the specified port
  15 * on the host.  Successul connects return STATE_OK, refusals
  16 * and timeouts return STATE_CRITICAL, other errors return
  17 * STATE_UNKNOWN.
  18 *
  19 * License Information:
  20 *
  21 * This program is free software; you can redistribute it and/or modify
  22 * it under the terms of the GNU General Public License as published by
  23 * the Free Software Foundation; either version 2 of the License, or
  24 * (at your option) any later version.
  25 *
  26 * This program is distributed in the hope that it will be useful,
  27 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  28 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  29 * GNU General Public License for more details.
  30 *
  31 * You should have received a copy of the GNU General Public License
  32 * along with this program; if not, write to the Free Software
  33 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  34 *
  35 *****************************************************************************/
  36
  37 #include "config.h"
  38 #include "common.h"
  39 #include "netutils.h"
  40 #include "utils.h"
  41
  42 const char *progname = "check_time";
  43 #define REVISION "$Revision$"
  44 #define COPYRIGHT "1999-2002"
  45 #define AUTHOR "Ethan Galstad"
  46 #define EMAIL "nagios@nagios.org"
  47 #define SUMMARY "Check time on the specified host.\n"
  48
  49 #define TIME_PORT       37
  50 #define UNIX_EPOCH      2208988800UL
  51
  52 unsigned long server_time, raw_server_time;
  53 time_t diff_time;
  54 int warning_time = 0;
  55 int check_warning_time = FALSE;
  56 int critical_time = 0;
  57 int check_critical_time = FALSE;
  58 unsigned long warning_diff = 0;
  59 int check_warning_diff = FALSE;
  60 unsigned long critical_diff = 0;
  61 int check_critical_diff = FALSE;
  62 int server_port = TIME_PORT;
  63 char *server_address = NULL;
  64
  65
  66 int process_arguments (int, char **);
  67 void print_usage (void);
  68 void print_help (void);
  69
  70
  71 int
  72 main (int argc, char **argv)
  73 {
  74         int sd;
  75         int result;
  76
  77         if (process_arguments (argc, argv) != OK)
  78                 usage ("Invalid command arguments supplied\n");
  79
  80         /* initialize alarm signal handling */
  81         signal (SIGALRM, socket_timeout_alarm_handler);
  82
  83         /* set socket timeout */
  84         alarm (socket_timeout);
  85         time (&start_time);
  86
  87         /* try to connect to the host at the given port number */
  88         if (my_tcp_connect (server_address, server_port, &sd) != STATE_OK) {
  89                 if (check_critical_time == TRUE)
  90                         result = STATE_CRITICAL;
  91                 else if (check_warning_time == TRUE)
  92                         result = STATE_WARNING;
  93                 else
  94                         result = STATE_UNKNOWN;
  95                 terminate (result,
  96                            "TIME UNKNOWN - could not connect to server %s, port %d\n",
  97                            server_address, server_port);
  98         }
  99
 100         /* watch for the connection string */
 101         result = recv (sd, (void *)&raw_server_time, sizeof (raw_server_time), 0);
 102
 103         /* close the connection */
 104         close (sd);
 105
 106         /* reset the alarm */
 107         time (&end_time);
 108         alarm (0);
 109
 110         /* return a WARNING status if we couldn't read any data */
 111         if (result <= 0) {
 112                 if (check_critical_time == TRUE)
 113                         result = STATE_CRITICAL;
 114                 else if (check_warning_time == TRUE)
 115                         result = STATE_WARNING;
 116                 else
 117                         result = STATE_UNKNOWN;
 118                 terminate (result,
 119                                                          "TIME UNKNOWN - no data on recv() from server %s, port %d\n",
 120                                                          server_address, server_port);
 121         }
 122
 123         result = STATE_OK;
 124
 125         if (check_critical_time == TRUE && (end_time - start_time) > critical_time)
 126                 result = STATE_CRITICAL;
 127         else if (check_warning_time == TRUE
 128                                          && (end_time - start_time) > warning_time) result = STATE_WARNING;
 129
 130         if (result != STATE_OK)
 131                 terminate (result, "TIME %s - %d second response time\n",
 132                                                          state_text (result), (int) (end_time - start_time));
 133
 134         server_time = ntohl (raw_server_time) - UNIX_EPOCH;
 135         if (server_time > end_time)
 136                 diff_time = server_time - end_time;
 137         else
 138                 diff_time = end_time - server_time;
 139
 140         if (check_critical_diff == TRUE && diff_time > critical_diff)
 141                 result = STATE_CRITICAL;
 142         else if (check_warning_diff == TRUE && diff_time > warning_diff)
 143                 result = STATE_WARNING;
 144
 145         printf ("TIME %s - %lu second time difference\n", state_text (result),
 146                                         diff_time);
 147         return result;
 148 }
 149
 150
 151
 152
 153
 154
 155 /* process command-line arguments */
 156 int
 157 process_arguments (int argc, char **argv)
 158 {
 159         int c;
 160
 161         int option_index = 0;
 162         static struct option long_options[] = {
 163                 {"hostname", required_argument, 0, 'H'},
 164                 {"warning-variance", required_argument, 0, 'w'},
 165                 {"critical-variance", required_argument, 0, 'c'},
 166                 {"warning-connect", required_argument, 0, 'W'},
 167                 {"critical-connect", required_argument, 0, 'C'},
 168                 {"port", required_argument, 0, 'p'},
 169                 {"timeout", required_argument, 0, 't'},
 170                 {"version", no_argument, 0, 'V'},
 171                 {"help", no_argument, 0, 'h'},
 172                 {0, 0, 0, 0}
 173         };
 174
 175         if (argc < 2)
 176                 usage ("\n");
 177
 178         for (c = 1; c < argc; c++) {
 179                 if (strcmp ("-to", argv[c]) == 0)
 180                         strcpy (argv[c], "-t");
 181                 else if (strcmp ("-wd", argv[c]) == 0)
 182                         strcpy (argv[c], "-w");
 183                 else if (strcmp ("-cd", argv[c]) == 0)
 184                         strcpy (argv[c], "-c");
 185                 else if (strcmp ("-wt", argv[c]) == 0)
 186                         strcpy (argv[c], "-W");
 187                 else if (strcmp ("-ct", argv[c]) == 0)
 188                         strcpy (argv[c], "-C");
 189         }
 190
 191         while (1) {
 192                 c = getopt_long (argc, argv, "hVH:w:c:W:C:p:t:", long_options,
 193                                                                          &option_index);
 194
 195                 if (c == -1 || c == EOF)
 196                         break;
 197
 198                 switch (c) {
 199                 case '?':                                                                       /* print short usage statement if args not parsable */
 200                         usage3 ("Unknown argument", optopt);
 201                 case 'h':                                                                       /* help */
 202                         print_help ();
 203                         exit (STATE_OK);
 204                 case 'V':                                                                       /* version */
 205                         print_revision (progname, REVISION);
 206                         exit (STATE_OK);
 207                 case 'H':                                                                       /* hostname */
 208                         if (is_host (optarg) == FALSE)
 209                                 usage ("Invalid host name/address\n");
 210                         server_address = optarg;
 211                         break;
 212                 case 'w':                                                                       /* warning-variance */
 213                         if (is_intnonneg (optarg)) {
 214                                 warning_diff = strtoul (optarg, NULL, 10);
 215                                 check_warning_diff = TRUE;
 216                         }
 217                         else if (strspn (optarg, "0123456789:,") > 0) {
 218                                 if (sscanf (optarg, "%lu%*[:,]%d", &warning_diff, &warning_time) == 2) {
 219                                         check_warning_diff = TRUE;
 220                                         check_warning_time = TRUE;
 221                                 }
 222                                 else {
 223                                         usage ("Warning thresholds must be a nonnegative integer\n");
 224                                 }
 225                         }
 226                         else {
 227                                 usage ("Warning threshold must be a nonnegative integer\n");
 228                         }
 229                         break;
 230                 case 'c':                                                                       /* critical-variance */
 231                         if (is_intnonneg (optarg)) {
 232                                 critical_diff = strtoul (optarg, NULL, 10);
 233                                 check_critical_diff = TRUE;
 234                         }
 235                         else if (strspn (optarg, "0123456789:,") > 0) {
 236                                 if (sscanf (optarg, "%lu%*[:,]%d", &critical_diff, &critical_time) ==
 237                                                 2) {
 238                                         check_critical_diff = TRUE;
 239                                         check_critical_time = TRUE;
 240                                 }
 241                                 else {
 242                                         usage ("Critical thresholds must be a nonnegative integer\n");
 243                                 }
 244                         }
 245                         else {
 246                                 usage ("Critical threshold must be a nonnegative integer\n");
 247                         }
 248                         break;
 249                 case 'W':                                                                       /* warning-connect */
 250                         if (!is_intnonneg (optarg))
 251                                 usage ("Warning threshold must be a nonnegative integer\n");
 252                         warning_time = atoi (optarg);
 253                         check_warning_time = TRUE;
 254                         break;
 255                 case 'C':                                                                       /* critical-connect */
 256                         if (!is_intnonneg (optarg))
 257                                 usage ("Critical threshold must be a nonnegative integer\n");
 258                         critical_time = atoi (optarg);
 259                         check_critical_time = TRUE;
 260                         break;
 261                 case 'p':                                                                       /* port */
 262                         if (!is_intnonneg (optarg))
 263                                 usage ("Serevr port must be a nonnegative integer\n");
 264                         server_port = atoi (optarg);
 265                         break;
 266                 case 't':                                                                       /* timeout */
 267                         if (!is_intnonneg (optarg))
 268                                 usage ("Timeout interval must be a nonnegative integer\n");
 269                         socket_timeout = atoi (optarg);
 270                         break;
 271                 }
 272         }
 273
 274         c = optind;
 275         if (server_address == NULL) {
 276                 if (argc > c) {
 277                         if (is_host (argv[c]) == FALSE)
 278                                 usage ("Invalid host name/address\n");
 279                         server_address = argv[c];
 280                 }
 281                 else {
 282                         usage ("Host name was not supplied\n");
 283                 }
 284         }
 285
 286         return OK;
 287 }
 288
 289
 290
 291
 292
 293 void
 294 print_usage (void)
 295 {
 296         printf
 297                 ("Usage:\n"
 298                  " %s -H <host_address> [-p port] [-w variance] [-c variance]\n"
 299                  "           [-W connect_time] [-C connect_time] [-t timeout]\n"
 300                  " %s (-h | --help) for detailed help\n"
 301                  " %s (-V | --version) for version information\n",
 302                  progname, progname, progname);
 303 }
 304
 305
 306
 307
 308
 309 void
 310 print_help (void)
 311 {
 312         print_revision (progname, REVISION);
 313         printf
 314                 ("Copyright (c) %s %s <%s>\n\n%s\n",
 315                  COPYRIGHT, AUTHOR, EMAIL, SUMMARY);
 316         print_usage ();
 317         printf
 318                 ("Options:\n"
 319                  " -H, --hostname=ADDRESS\n"
 320                  "    Host name argument for servers using host headers (use numeric\n"
 321                  "    address if possible to bypass DNS lookup).\n"
 322                  " -w, --warning-variance=INTEGER\n"
 323                  "    Time difference (sec.) necessary to result in a warning status\n"
 324                  " -c, --critical-variance=INTEGER\n"
 325                  "    Time difference (sec.) necessary to result in a critical status\n"
 326                  " -W, --warning-connect=INTEGER\n"
 327                  "    Response time (sec.) necessary to result in warning status\n"
 328                  " -C, --critical-connect=INTEGER\n"
 329                  "    Response time (sec.) necessary to result in critical status\n"
 330                  " -t, --timeout=INTEGER\n"
 331                  "    Seconds before connection times out (default: %d)\n"
 332                  " -p, --port=INTEGER\n"
 333                  "    Port number (default: %d)\n"
 334                  " -h, --help\n"
 335                  "    Print detailed help screen\n"
 336                  " -V, --version\n"
 337                  "    Print version information\n\n", DEFAULT_SOCKET_TIMEOUT, TIME_PORT);
 338         support ();
 339 }