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 #ifdef HAVE_GETOPT_H
162 int option_index = 0;
163 static struct option long_options[] = {
164 {"hostname", required_argument, 0, 'H'},
165 {"warning-variance", required_argument, 0, 'w'},
166 {"critical-variance", required_argument, 0, 'c'},
167 {"warning-connect", required_argument, 0, 'W'},
168 {"critical-connect", required_argument, 0, 'C'},
169 {"port", required_argument, 0, 'p'},
170 {"timeout", required_argument, 0, 't'},
171 {"version", no_argument, 0, 'V'},
172 {"help", no_argument, 0, 'h'},
173 {0, 0, 0, 0}
174 };
175 #endif
177 if (argc < 2)
178 usage ("\n");
180 for (c = 1; c < argc; c++) {
181 if (strcmp ("-to", argv[c]) == 0)
182 strcpy (argv[c], "-t");
183 else if (strcmp ("-wd", argv[c]) == 0)
184 strcpy (argv[c], "-w");
185 else if (strcmp ("-cd", argv[c]) == 0)
186 strcpy (argv[c], "-c");
187 else if (strcmp ("-wt", argv[c]) == 0)
188 strcpy (argv[c], "-W");
189 else if (strcmp ("-ct", argv[c]) == 0)
190 strcpy (argv[c], "-C");
191 }
193 while (1) {
194 #ifdef HAVE_GETOPT_H
195 c =
196 getopt_long (argc, argv, "hVH:w:c:W:C:p:t:", long_options,
197 &option_index);
198 #else
199 c = getopt (argc, argv, "hVH:w:c:W:C:p:t:");
200 #endif
202 if (c == -1 || c == EOF)
203 break;
205 switch (c) {
206 case '?': /* print short usage statement if args not parsable */
207 usage3 ("Unknown argument", optopt);
208 case 'h': /* help */
209 print_help ();
210 exit (STATE_OK);
211 case 'V': /* version */
212 print_revision (progname, REVISION);
213 exit (STATE_OK);
214 case 'H': /* hostname */
215 if (is_host (optarg) == FALSE)
216 usage ("Invalid host name/address\n");
217 server_address = optarg;
218 break;
219 case 'w': /* warning-variance */
220 if (is_intnonneg (optarg)) {
221 warning_diff = strtoul (optarg, NULL, 10);
222 check_warning_diff = TRUE;
223 }
224 else if (strspn (optarg, "0123456789:,") > 0) {
225 if (sscanf (optarg, "%lu%*[:,]%d", &warning_diff, &warning_time) == 2) {
226 check_warning_diff = TRUE;
227 check_warning_time = TRUE;
228 }
229 else {
230 usage ("Warning thresholds must be a nonnegative integer\n");
231 }
232 }
233 else {
234 usage ("Warning threshold must be a nonnegative integer\n");
235 }
236 break;
237 case 'c': /* critical-variance */
238 if (is_intnonneg (optarg)) {
239 critical_diff = strtoul (optarg, NULL, 10);
240 check_critical_diff = TRUE;
241 }
242 else if (strspn (optarg, "0123456789:,") > 0) {
243 if (sscanf (optarg, "%lu%*[:,]%d", &critical_diff, &critical_time) ==
244 2) {
245 check_critical_diff = TRUE;
246 check_critical_time = TRUE;
247 }
248 else {
249 usage ("Critical thresholds must be a nonnegative integer\n");
250 }
251 }
252 else {
253 usage ("Critical threshold must be a nonnegative integer\n");
254 }
255 break;
256 case 'W': /* warning-connect */
257 if (!is_intnonneg (optarg))
258 usage ("Warning threshold must be a nonnegative integer\n");
259 warning_time = atoi (optarg);
260 check_warning_time = TRUE;
261 break;
262 case 'C': /* critical-connect */
263 if (!is_intnonneg (optarg))
264 usage ("Critical threshold must be a nonnegative integer\n");
265 critical_time = atoi (optarg);
266 check_critical_time = TRUE;
267 break;
268 case 'p': /* port */
269 if (!is_intnonneg (optarg))
270 usage ("Serevr port must be a nonnegative integer\n");
271 server_port = atoi (optarg);
272 break;
273 case 't': /* timeout */
274 if (!is_intnonneg (optarg))
275 usage ("Timeout interval must be a nonnegative integer\n");
276 socket_timeout = atoi (optarg);
277 break;
278 }
279 }
281 c = optind;
282 if (server_address == NULL) {
283 if (argc > c) {
284 if (is_host (argv[c]) == FALSE)
285 usage ("Invalid host name/address\n");
286 server_address = argv[c];
287 }
288 else {
289 usage ("Host name was not supplied\n");
290 }
291 }
293 return OK;
294 }
300 void
301 print_usage (void)
302 {
303 printf
304 ("Usage:\n"
305 " %s -H <host_address> [-p port] [-w variance] [-c variance]\n"
306 " [-W connect_time] [-C connect_time] [-t timeout]\n"
307 " %s (-h | --help) for detailed help\n"
308 " %s (-V | --version) for version information\n",
309 progname, progname, progname);
310 }
316 void
317 print_help (void)
318 {
319 print_revision (progname, REVISION);
320 printf
321 ("Copyright (c) %s %s <%s>\n\n%s\n",
322 COPYRIGHT, AUTHOR, EMAIL, SUMMARY);
323 print_usage ();
324 printf
325 ("Options:\n"
326 " -H, --hostname=ADDRESS\n"
327 " Host name argument for servers using host headers (use numeric\n"
328 " address if possible to bypass DNS lookup).\n"
329 " -w, --warning-variance=INTEGER\n"
330 " Time difference (sec.) necessary to result in a warning status\n"
331 " -c, --critical-variance=INTEGER\n"
332 " Time difference (sec.) necessary to result in a critical status\n"
333 " -W, --warning-connect=INTEGER\n"
334 " Response time (sec.) necessary to result in warning status\n"
335 " -C, --critical-connect=INTEGER\n"
336 " Response time (sec.) necessary to result in critical status\n"
337 " -t, --timeout=INTEGER\n"
338 " Seconds before connection times out (default: %d)\n"
339 " -p, --port=INTEGER\n"
340 " Port number (default: %d)\n"
341 " -h, --help\n"
342 " Print detailed help screen\n"
343 " -V, --version\n"
344 " Print version information\n\n", DEFAULT_SOCKET_TIMEOUT, TIME_PORT);
345 support ();
346 }