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 *****************************************************************************/
37 #include "config.h"
38 #include "common.h"
39 #include "netutils.h"
40 #include "utils.h"
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"
49 #define TIME_PORT 37
50 #define UNIX_EPOCH 2208988800UL
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;
66 int process_arguments (int, char **);
67 void print_usage (void);
68 void print_help (void);
71 int
72 main (int argc, char **argv)
73 {
74 int sd;
75 int result;
77 if (process_arguments (argc, argv) != OK)
78 usage ("Invalid command arguments supplied\n");
80 /* initialize alarm signal handling */
81 signal (SIGALRM, socket_timeout_alarm_handler);
83 /* set socket timeout */
84 alarm (socket_timeout);
85 time (&start_time);
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 }
100 /* watch for the connection string */
101 result = recv (sd, (void *)&raw_server_time, sizeof (raw_server_time), 0);
103 /* close the connection */
104 close (sd);
106 /* reset the alarm */
107 time (&end_time);
108 alarm (0);
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 }
123 result = STATE_OK;
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;
130 if (result != STATE_OK)
131 terminate (result, "TIME %s - %d second response time\n",
132 state_text (result), (int) (end_time - start_time));
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;
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;
145 printf ("TIME %s - %lu second time difference\n", state_text (result),
146 diff_time);
147 return result;
148 }
155 /* process command-line arguments */
156 int
157 process_arguments (int argc, char **argv)
158 {
159 int c;
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 };
175 if (argc < 2)
176 usage ("\n");
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 }
191 while (1) {
192 c = getopt_long (argc, argv, "hVH:w:c:W:C:p:t:", long_options,
193 &option_index);
195 if (c == -1 || c == EOF)
196 break;
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 }
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 }
286 return OK;
287 }
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 }
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 }