plugins/check_time.c

   1 /*****************************************************************************
   2 *
   3 * Nagios check_time plugin
   4 *
   5 * License: GPL
   6 * Copyright (c) 1999-2007 Nagios Plugins Development Team
   7 *
   8 * Last Modified: $Date$
   9 *
  10 * Description:
  11 *
  12 * This file contains the check_time plugin
  13 *
  14 * This plugin will check the time difference with the specified host.
  15 *
  16 *
  17 * This program is free software: you can redistribute it and/or modify
  18 * it under the terms of the GNU General Public License as published by
  19 * the Free Software Foundation, either version 3 of the License, or
  20 * (at your option) any later version.
  21 *
  22 * This program is distributed in the hope that it will be useful,
  23 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  24 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  25 * GNU General Public License for more details.
  26 *
  27 * You should have received a copy of the GNU General Public License
  28 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  29 *
  30 * $Id$
  31 *
  32 *****************************************************************************/
  33
  34 const char *progname = "check_time";
  35 const char *revision = "$Revision$";
  36 const char *copyright = "1999-2007";
  37 const char *email = "nagiosplug-devel@lists.sourceforge.net";
  38
  39 #include "common.h"
  40 #include "netutils.h"
  41 #include "utils.h"
  42
  43 enum {
  44         TIME_PORT = 37
  45 };
  46
  47 #define UNIX_EPOCH 2208988800UL
  48
  49 uint32_t raw_server_time;
  50 unsigned long server_time, diff_time;
  51 int warning_time = 0;
  52 int check_warning_time = FALSE;
  53 int critical_time = 0;
  54 int check_critical_time = FALSE;
  55 unsigned long warning_diff = 0;
  56 int check_warning_diff = FALSE;
  57 unsigned long critical_diff = 0;
  58 int check_critical_diff = FALSE;
  59 int server_port = TIME_PORT;
  60 char *server_address = NULL;
  61 int use_udp = FALSE;
  62
  63 int process_arguments (int, char **);
  64 void print_help (void);
  65 void print_usage (void);
  66
  67 int
  68 main (int argc, char **argv)
  69 {
  70         int sd;
  71         int result = STATE_UNKNOWN;
  72         time_t conntime;
  73
  74         setlocale (LC_ALL, "");
  75         bindtextdomain (PACKAGE, LOCALEDIR);
  76         textdomain (PACKAGE);
  77
  78         if (process_arguments (argc, argv) == ERROR)
  79                 usage4 (_("Could not parse arguments"));
  80
  81         /* initialize alarm signal handling */
  82         signal (SIGALRM, socket_timeout_alarm_handler);
  83
  84         /* set socket timeout */
  85         alarm (socket_timeout);
  86         time (&start_time);
  87
  88         /* try to connect to the host at the given port number */
  89         if (use_udp) {
  90                 result = my_udp_connect (server_address, server_port, &sd);
  91         } else {
  92                 result = my_tcp_connect (server_address, server_port, &sd);
  93         }
  94
  95         if (result != STATE_OK) {
  96                 if (check_critical_time == TRUE)
  97                         result = STATE_CRITICAL;
  98                 else if (check_warning_time == TRUE)
  99                         result = STATE_WARNING;
 100                 else
 101                         result = STATE_UNKNOWN;
 102                 die (result,
 103                            _("TIME UNKNOWN - could not connect to server %s, port %d\n"),
 104                            server_address, server_port);
 105         }
 106
 107         if (use_udp) {
 108                 if (send (sd, "", 0, 0) < 0) {
 109                         if (check_critical_time == TRUE)
 110                                 result = STATE_CRITICAL;
 111                         else if (check_warning_time == TRUE)
 112                                 result = STATE_WARNING;
 113                         else
 114                                 result = STATE_UNKNOWN;
 115                         die (result,
 116                           _("TIME UNKNOWN - could not send UDP request to server %s, port %d\n"),
 117                           server_address, server_port);
 118                 }
 119         }
 120
 121         /* watch for the connection string */
 122         result = recv (sd, (void *)&raw_server_time, sizeof (raw_server_time), 0);
 123
 124         /* close the connection */
 125         close (sd);
 126
 127         /* reset the alarm */
 128         time (&end_time);
 129         alarm (0);
 130
 131         /* return a WARNING status if we couldn't read any data */
 132         if (result <= 0) {
 133                 if (check_critical_time == TRUE)
 134                         result = STATE_CRITICAL;
 135                 else if (check_warning_time == TRUE)
 136                         result = STATE_WARNING;
 137                 else
 138                         result = STATE_UNKNOWN;
 139                 die (result,
 140                                                          _("TIME UNKNOWN - no data received from server %s, port %d\n"),
 141                                                          server_address, server_port);
 142         }
 143
 144         result = STATE_OK;
 145
 146         conntime = (end_time - start_time);
 147         if (check_critical_time == TRUE && conntime > critical_time)
 148                 result = STATE_CRITICAL;
 149         else if (check_warning_time == TRUE && conntime > warning_time)
 150                 result = STATE_WARNING;
 151
 152         if (result != STATE_OK)
 153                 die (result, _("TIME %s - %d second response time|%s\n"),
 154                      state_text (result), (int)conntime,
 155                      perfdata ("time", (long)conntime, "s",
 156                                check_warning_time, (long)warning_time,
 157                                check_critical_time, (long)critical_time,
 158                                TRUE, 0, FALSE, 0));
 159
 160         server_time = ntohl (raw_server_time) - UNIX_EPOCH;
 161         if (server_time > (unsigned long)end_time)
 162                 diff_time = server_time - (unsigned long)end_time;
 163         else
 164                 diff_time = (unsigned long)end_time - server_time;
 165
 166         if (check_critical_diff == TRUE && diff_time > critical_diff)
 167                 result = STATE_CRITICAL;
 168         else if (check_warning_diff == TRUE && diff_time > warning_diff)
 169                 result = STATE_WARNING;
 170
 171         printf (_("TIME %s - %lu second time difference|%s %s\n"),
 172                 state_text (result), diff_time,
 173                 perfdata ("time", (long)conntime, "s",
 174                           check_warning_time, (long)warning_time,
 175                           check_critical_time, (long)critical_time,
 176                           TRUE, 0, FALSE, 0),
 177                 perfdata ("offset", diff_time, "s",
 178                           check_warning_diff, warning_diff,
 179                           check_critical_diff, critical_diff,
 180                           TRUE, 0, FALSE, 0));
 181         return result;
 182 }
 183
 184
 185
 186 /* process command-line arguments */
 187 int
 188 process_arguments (int argc, char **argv)
 189 {
 190         int c;
 191
 192         int option = 0;
 193         static struct option longopts[] = {
 194                 {"hostname", required_argument, 0, 'H'},
 195                 {"warning-variance", required_argument, 0, 'w'},
 196                 {"critical-variance", required_argument, 0, 'c'},
 197                 {"warning-connect", required_argument, 0, 'W'},
 198                 {"critical-connect", required_argument, 0, 'C'},
 199                 {"port", required_argument, 0, 'p'},
 200                 {"udp", no_argument, 0, 'u'},
 201                 {"timeout", required_argument, 0, 't'},
 202                 {"version", no_argument, 0, 'V'},
 203                 {"help", no_argument, 0, 'h'},
 204                 {0, 0, 0, 0}
 205         };
 206
 207         if (argc < 2)
 208                 usage ("\n");
 209
 210         for (c = 1; c < argc; c++) {
 211                 if (strcmp ("-to", argv[c]) == 0)
 212                         strcpy (argv[c], "-t");
 213                 else if (strcmp ("-wd", argv[c]) == 0)
 214                         strcpy (argv[c], "-w");
 215                 else if (strcmp ("-cd", argv[c]) == 0)
 216                         strcpy (argv[c], "-c");
 217                 else if (strcmp ("-wt", argv[c]) == 0)
 218                         strcpy (argv[c], "-W");
 219                 else if (strcmp ("-ct", argv[c]) == 0)
 220                         strcpy (argv[c], "-C");
 221         }
 222
 223         while (1) {
 224                 c = getopt_long (argc, argv, "hVH:w:c:W:C:p:t:u", longopts,
 225                                                                          &option);
 226
 227                 if (c == -1 || c == EOF)
 228                         break;
 229
 230                 switch (c) {
 231                 case '?':                                                                       /* print short usage statement if args not parsable */
 232                         usage5 ();
 233                 case 'h':                                                                       /* help */
 234                         print_help ();
 235                         exit (STATE_OK);
 236                 case 'V':                                                                       /* version */
 237                         print_revision (progname, revision);
 238                         exit (STATE_OK);
 239                 case 'H':                                                                       /* hostname */
 240                         if (is_host (optarg) == FALSE)
 241                                 usage2 (_("Invalid hostname/address"), optarg);
 242                         server_address = optarg;
 243                         break;
 244                 case 'w':                                                                       /* warning-variance */
 245                         if (is_intnonneg (optarg)) {
 246                                 warning_diff = strtoul (optarg, NULL, 10);
 247                                 check_warning_diff = TRUE;
 248                         }
 249                         else if (strspn (optarg, "0123456789:,") > 0) {
 250                                 if (sscanf (optarg, "%lu%*[:,]%d", &warning_diff, &warning_time) == 2) {
 251                                         check_warning_diff = TRUE;
 252                                         check_warning_time = TRUE;
 253                                 }
 254                                 else {
 255                                         usage4 (_("Warning thresholds must be a positive integer"));
 256                                 }
 257                         }
 258                         else {
 259                                 usage4 (_("Warning threshold must be a positive integer"));
 260                         }
 261                         break;
 262                 case 'c':                                                                       /* critical-variance */
 263                         if (is_intnonneg (optarg)) {
 264                                 critical_diff = strtoul (optarg, NULL, 10);
 265                                 check_critical_diff = TRUE;
 266                         }
 267                         else if (strspn (optarg, "0123456789:,") > 0) {
 268                                 if (sscanf (optarg, "%lu%*[:,]%d", &critical_diff, &critical_time) ==
 269                                                 2) {
 270                                         check_critical_diff = TRUE;
 271                                         check_critical_time = TRUE;
 272                                 }
 273                                 else {
 274                                         usage4 (_("Critical thresholds must be a positive integer"));
 275                                 }
 276                         }
 277                         else {
 278                                 usage4 (_("Critical threshold must be a positive integer"));
 279                         }
 280                         break;
 281                 case 'W':                                                                       /* warning-connect */
 282                         if (!is_intnonneg (optarg))
 283                                 usage4 (_("Warning threshold must be a positive integer"));
 284                         else
 285                                 warning_time = atoi (optarg);
 286                         check_warning_time = TRUE;
 287                         break;
 288                 case 'C':                                                                       /* critical-connect */
 289                         if (!is_intnonneg (optarg))
 290                                 usage4 (_("Critical threshold must be a positive integer"));
 291                         else
 292                                 critical_time = atoi (optarg);
 293                         check_critical_time = TRUE;
 294                         break;
 295                 case 'p':                                                                       /* port */
 296                         if (!is_intnonneg (optarg))
 297                                 usage4 (_("Port must be a positive integer"));
 298                         else
 299                                 server_port = atoi (optarg);
 300                         break;
 301                 case 't':                                                                       /* timeout */
 302                         if (!is_intnonneg (optarg))
 303                                 usage2 (_("Timeout interval must be a positive integer"), optarg);
 304                         else
 305                                 socket_timeout = atoi (optarg);
 306                         break;
 307                 case 'u':                                                                       /* udp */
 308                         use_udp = TRUE;
 309                 }
 310         }
 311
 312         c = optind;
 313         if (server_address == NULL) {
 314                 if (argc > c) {
 315                         if (is_host (argv[c]) == FALSE)
 316                                 usage2 (_("Invalid hostname/address"), optarg);
 317                         server_address = argv[c];
 318                 }
 319                 else {
 320                         usage4 (_("Hostname was not supplied"));
 321                 }
 322         }
 323
 324         return OK;
 325 }
 326
 327
 328
 329 void
 330 print_help (void)
 331 {
 332         char *myport;
 333         asprintf (&myport, "%d", TIME_PORT);
 334
 335         print_revision (progname, revision);
 336
 337         printf ("Copyright (c) 1999 Ethan Galstad\n");
 338         printf (COPYRIGHT, copyright, email);
 339
 340         printf ("%s\n", _("This plugin will check the time on the specified host."));
 341
 342   printf ("\n\n");
 343
 344         print_usage ();
 345
 346         printf (_(UT_HELP_VRSN));
 347
 348         printf (_(UT_HOST_PORT), 'p', myport);
 349
 350         printf (" %s\n", "-u, --udp");
 351   printf ("   %s\n", _("Use UDP to connect, not TCP"));
 352   printf (" %s\n", "-w, --warning-variance=INTEGER");
 353   printf ("   %s\n", _("Time difference (sec.) necessary to result in a warning status"));
 354   printf (" %s\n", "-c, --critical-variance=INTEGER");
 355   printf ("   %s\n", _("Time difference (sec.) necessary to result in a critical status"));
 356   printf (" %s\n", "-W, --warning-connect=INTEGER");
 357   printf ("   %s\n", _("Response time (sec.) necessary to result in warning status"));
 358   printf (" %s\n", "-C, --critical-connect=INTEGER");
 359   printf ("   %s\n", _("Response time (sec.) necessary to result in critical status"));
 360
 361         printf (_(UT_TIMEOUT), DEFAULT_SOCKET_TIMEOUT);
 362         printf (_(UT_SUPPORT));
 363 }
 364
 365
 366
 367 void
 368 print_usage (void)
 369 {
 370   printf (_("Usage:"));
 371         printf ("%s -H <host_address> [-p port] [-u] [-w variance] [-c variance]\n",progname);
 372   printf (" [-W connect_time] [-C connect_time] [-t timeout]\n");
 373 }