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authorEthan Galstad <egalstad@users.sourceforge.net>2002-02-28 06:42:51 (GMT)
committerEthan Galstad <egalstad@users.sourceforge.net>2002-02-28 06:42:51 (GMT)
commit44a321cb8a42d6c0ea2d96a1086a17f2134c89cc (patch)
treea1a4d9f7b92412a17ab08f34f04eec45433048b7 /plugins/check_tcp.c
parent54fd5d7022ff2d6a59bc52b8869182f3fc77a058 (diff)
downloadmonitoring-plugins-44a321cb8a42d6c0ea2d96a1086a17f2134c89cc.tar.gz
Initial revision
git-svn-id: https://nagiosplug.svn.sourceforge.net/svnroot/nagiosplug/nagiosplug/trunk@2 f882894a-f735-0410-b71e-b25c423dba1c
Diffstat (limited to 'plugins/check_tcp.c')
-rw-r--r--plugins/check_tcp.c563
1 files changed, 563 insertions, 0 deletions
diff --git a/plugins/check_tcp.c b/plugins/check_tcp.c
new file mode 100644
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1/******************************************************************************
2 *
3 * This file is part of the Nagios Plugins.
4 *
5 * Copyright (c) 1999 Ethan Galstad <nagios@nagios.org>
6 *
7 * The Nagios Plugins are free software; you can redistribute them
8 * and/or modify them under the terms of the GNU General Public
9 * License as published by the Free Software Foundation; either
10 * version 2 of the License, or (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful, but
13 * WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
20 *
21 * $Id$
22 *
23 *****************************************************************************/
24
25#define PROGRAM check_tcp
26#define DESCRIPTION "Check a TCP port"
27#define AUTHOR "Ethan Galstad"
28#define EMAIL "nagios@nagios.org"
29#define COPYRIGHTDATE "1999"
30
31#include "config.h"
32#include "common.h"
33#include "netutils.h"
34#include "utils.h"
35
36#ifdef HAVE_SSL_H
37#include <rsa.h>
38#include <crypto.h>
39#include <x509.h>
40#include <pem.h>
41#include <ssl.h>
42#include <err.h>
43#endif
44
45#ifdef HAVE_OPENSSL_SSL_H
46#include <openssl/rsa.h>
47#include <openssl/crypto.h>
48#include <openssl/x509.h>
49#include <openssl/pem.h>
50#include <openssl/ssl.h>
51#include <openssl/err.h>
52#endif
53
54#ifdef HAVE_SSL
55SSL_CTX *ctx;
56SSL *ssl;
57int connect_SSL (void);
58#endif
59
60#define TCP_PROTOCOL 1
61#define UDP_PROTOCOL 2
62
63int process_arguments (int, char **);
64void print_usage (void);
65void print_help (void);
66
67char *PROGNAME = NULL;
68char *SERVICE = NULL;
69char *SEND = NULL;
70char *EXPECT = NULL;
71char *QUIT = NULL;
72int PROTOCOL = 0;
73int PORT = 0;
74
75int server_port = 0;
76char *server_address = NULL;
77char *server_send = NULL;
78char *server_quit = NULL;
79char **server_expect = NULL;
80int server_expect_count = 0;
81char **warn_codes = NULL;
82int warn_codes_count = 0;
83char **crit_codes = NULL;
84int crit_codes_count = 0;
85int delay = 0;
86int warning_time = 0;
87int check_warning_time = FALSE;
88int critical_time = 0;
89int check_critical_time = FALSE;
90int verbose = FALSE;
91int use_ssl = FALSE;
92int sd;
93
94int
95main (int argc, char **argv)
96{
97 int result;
98 int i;
99 char buffer[MAX_INPUT_BUFFER] = "";
100 char *status = NULL;
101 char *output = NULL;
102 char *ptr = NULL;
103
104 if (strstr (argv[0], "check_udp")) {
105 PROGNAME = strscpy (PROGNAME, "check_udp");
106 SERVICE = strscpy (SERVICE, "UDP");
107 SEND = NULL;
108 EXPECT = NULL;
109 QUIT = NULL;
110 PROTOCOL = UDP_PROTOCOL;
111 PORT = 0;
112 }
113 else if (strstr (argv[0], "check_tcp")) {
114 PROGNAME = strscpy (PROGNAME, "check_tcp");
115 SERVICE = strscpy (SERVICE, "TCP");
116 SEND = NULL;
117 EXPECT = NULL;
118 QUIT = NULL;
119 PROTOCOL = TCP_PROTOCOL;
120 PORT = 0;
121 }
122 else if (strstr (argv[0], "check_ftp")) {
123 PROGNAME = strscpy (PROGNAME, "check_ftp");
124 SERVICE = strscpy (SERVICE, "FTP");
125 SEND = NULL;
126 EXPECT = strscpy (EXPECT, "220");
127 QUIT = strscpy (QUIT, "QUIT\r\n");
128 PROTOCOL = TCP_PROTOCOL;
129 PORT = 21;
130 }
131 else if (strstr (argv[0], "check_smtp")) {
132 PROGNAME = strscpy (PROGNAME, "check_smtp");
133 SERVICE = strscpy (SERVICE, "SMTP");
134 SEND = NULL;
135 EXPECT = strscpy (EXPECT, "220");
136 QUIT = strscpy (QUIT, "QUIT\r\n");
137 PROTOCOL = TCP_PROTOCOL;
138 PORT = 25;
139 }
140 else if (strstr (argv[0], "check_pop")) {
141 PROGNAME = strscpy (PROGNAME, "check_pop");
142 SERVICE = strscpy (SERVICE, "POP");
143 SEND = NULL;
144 EXPECT = strscpy (EXPECT, "110");
145 QUIT = strscpy (QUIT, "QUIT\r\n");
146 PROTOCOL = TCP_PROTOCOL;
147 PORT = 110;
148 }
149 else if (strstr (argv[0], "check_imap")) {
150 PROGNAME = strscpy (PROGNAME, "check_imap");
151 SERVICE = strscpy (SERVICE, "IMAP");
152 SEND = NULL;
153 EXPECT = strscpy (EXPECT, "* OK");
154 QUIT = strscpy (QUIT, "a1 LOGOUT\r\n");
155 PROTOCOL = TCP_PROTOCOL;
156 PORT = 143;
157 }
158#ifdef HAVE_SSL
159 else if (strstr(argv[0],"check_simap")) {
160 PROGNAME=strscpy(PROGNAME,"check_simap");
161 SERVICE=strscpy(SERVICE,"SIMAP");
162 SEND=NULL;
163 EXPECT=strscpy(EXPECT,"* OK");
164 QUIT=strscpy(QUIT,"a1 LOGOUT\n");
165 PROTOCOL=TCP_PROTOCOL;
166 use_ssl=TRUE;
167 PORT=993;
168 }
169#endif
170 else if (strstr (argv[0], "check_nntp")) {
171 PROGNAME = strscpy (PROGNAME, "check_nntp");
172 SERVICE = strscpy (SERVICE, "NNTP");
173 SEND = NULL;
174 EXPECT = NULL;
175 server_expect = realloc (server_expect, ++server_expect_count);
176 server_expect[server_expect_count - 1] = strscpy (EXPECT, "200");
177 server_expect = realloc (server_expect, ++server_expect_count);
178 server_expect[server_expect_count - 1] = strscpy (NULL, "201");
179 QUIT = strscpy (QUIT, "QUIT\r\n");
180 PROTOCOL = TCP_PROTOCOL;
181 PORT = 119;
182 }
183 else {
184 usage ("ERROR: Generic check_tcp called with unknown service\n");
185 }
186
187 server_address = strscpy (NULL, "127.0.0.1");
188 server_port = PORT;
189 server_send = SEND;
190 server_quit = QUIT;
191
192 if (process_arguments (argc, argv) == ERROR)
193 usage ("Could not parse arguments\n");
194
195 /* use default expect if none listed in process_arguments() */
196 if (EXPECT && server_expect_count == 0) {
197 server_expect = malloc (1);
198 server_expect[server_expect_count - 1] = EXPECT;
199 }
200
201 /* initialize alarm signal handling */
202 signal (SIGALRM, socket_timeout_alarm_handler);
203
204 /* set socket timeout */
205 alarm (socket_timeout);
206
207 /* try to connect to the host at the given port number */
208 time (&start_time);
209#ifdef HAVE_SSL
210 if (use_ssl)
211 result = connect_SSL ();
212 else
213#endif
214 {
215 if (PROTOCOL == UDP_PROTOCOL)
216 result = my_udp_connect (server_address, server_port, &sd);
217 else /* default is TCP */
218 result = my_tcp_connect (server_address, server_port, &sd);
219 }
220
221 if (result == STATE_CRITICAL)
222 return STATE_CRITICAL;
223
224 if (server_send != NULL) { /* Something to send? */
225 snprintf (buffer, MAX_INPUT_BUFFER - 1, "%s\r\n", server_send);
226 buffer[MAX_INPUT_BUFFER - 1] = 0;
227#ifdef HAVE_SSL
228 if (use_ssl)
229 SSL_write(ssl,buffer,strlen(buffer));
230 else
231#endif
232 send (sd, buffer, strlen (buffer), 0);
233 }
234
235 if (delay > 0) {
236 start_time = start_time + delay;
237 sleep (delay);
238 }
239
240 if (server_send || server_expect_count > 0) {
241
242 /* watch for the expect string */
243#ifdef HAVE_SSL
244 if (use_ssl && SSL_read (ssl, buffer, MAX_INPUT_BUFFER - 1)>=0)
245 status = strscat(status,buffer);
246 else
247#endif
248 {
249 if (recv (sd, buffer, MAX_INPUT_BUFFER - 1, 0) >= 0)
250 status = strscat (status, buffer);
251 }
252 strip (status);
253
254 /* return a CRITICAL status if we couldn't read any data */
255 if (status == NULL)
256 terminate (STATE_CRITICAL, "No data received from host\n");
257
258 if (status && verbose)
259 printf ("%s\n", status);
260
261 if (server_expect_count > 0) {
262 for (i = 0;; i++) {
263 printf ("%d %d\n", i, server_expect_count);
264 if (i >= server_expect_count)
265 terminate (STATE_WARNING, "Invalid response from host\n");
266 if (strstr (status, server_expect[i]))
267 break;
268 }
269 }
270 }
271
272 if (server_quit)
273#ifdef HAVE_SSL
274 if (use_ssl) {
275 SSL_write (ssl, QUIT, strlen (QUIT));
276 SSL_shutdown (ssl);
277 SSL_free (ssl);
278 SSL_CTX_free (ctx);
279 }
280 else
281#endif
282 send (sd, server_quit, strlen (server_quit), 0);
283
284 /* close the connection */
285 close (sd);
286
287 time (&end_time);
288
289 if (check_critical_time == TRUE && (end_time - start_time) > critical_time)
290 result = STATE_CRITICAL;
291 else if (check_warning_time == TRUE
292 && (end_time - start_time) > warning_time) result = STATE_WARNING;
293
294 /* reset the alarm */
295 alarm (0);
296
297 printf
298 ("%s %s - %d second response time on port %d",
299 SERVICE,
300 state_text (result), (int) (end_time - start_time), server_port);
301
302 if (status)
303 printf (" [%s]\n", status);
304 else
305 printf ("\n");
306
307 return result;
308}
309
310
311
312
313
314
315
316/* process command-line arguments */
317int
318process_arguments (int argc, char **argv)
319{
320 int c;
321
322#ifdef HAVE_GETOPT_H
323 int option_index = 0;
324 static struct option long_options[] = {
325 {"hostname", required_argument, 0, 'H'},
326 {"critical-time", required_argument, 0, 'c'},
327 {"warning-time", required_argument, 0, 'w'},
328 {"critical-codes", required_argument, 0, 'C'},
329 {"warning-codes", required_argument, 0, 'W'},
330 {"timeout", required_argument, 0, 't'},
331 {"protocol", required_argument, 0, 'P'},
332 {"port", required_argument, 0, 'p'},
333 {"send", required_argument, 0, 's'},
334 {"expect", required_argument, 0, 'e'},
335 {"quit", required_argument, 0, 'q'},
336 {"delay", required_argument, 0, 'd'},
337 {"verbose", no_argument, 0, 'v'},
338 {"version", no_argument, 0, 'V'},
339 {"help", no_argument, 0, 'h'},
340 {0, 0, 0, 0}
341 };
342#endif
343
344 if (argc < 2)
345 usage ("No arguments found\n");
346
347 /* backwards compatibility */
348 for (c = 1; c < argc; c++) {
349 if (strcmp ("-to", argv[c]) == 0)
350 strcpy (argv[c], "-t");
351 else if (strcmp ("-wt", argv[c]) == 0)
352 strcpy (argv[c], "-w");
353 else if (strcmp ("-ct", argv[c]) == 0)
354 strcpy (argv[c], "-c");
355 }
356
357 if (!is_option (argv[1])) {
358 server_address = argv[1];
359 argv[1] = argv[0];
360 argv = &argv[1];
361 argc--;
362 }
363
364 while (1) {
365#ifdef HAVE_GETOPT_H
366 c =
367 getopt_long (argc, argv, "+hVvH:s:e:q:c:w:t:p:C:W:d:S", long_options,
368 &option_index);
369#else
370 c = getopt (argc, argv, "+hVvH:s:e:q:c:w:t:p:C:W:d:S");
371#endif
372
373 if (c == -1 || c == EOF || c == 1)
374 break;
375
376 switch (c) {
377 case '?': /* print short usage statement if args not parsable */
378 printf ("%s: Unknown argument: %s\n\n", my_basename (argv[0]), optarg);
379 print_usage ();
380 exit (STATE_UNKNOWN);
381 case 'h': /* help */
382 print_help ();
383 exit (STATE_OK);
384 case 'V': /* version */
385 print_revision (PROGNAME, "$Revision$");
386 exit (STATE_OK);
387 case 'v': /* verbose mode */
388 verbose = TRUE;
389 break;
390 case 'H': /* hostname */
391 if (is_host (optarg) == FALSE)
392 usage ("Invalid host name/address\n");
393 server_address = optarg;
394 break;
395 case 'c': /* critical */
396 if (!is_intnonneg (optarg))
397 usage ("Critical threshold must be a nonnegative integer\n");
398 critical_time = atoi (optarg);
399 check_critical_time = TRUE;
400 break;
401 case 'w': /* warning */
402 if (!is_intnonneg (optarg))
403 usage ("Warning threshold must be a nonnegative integer\n");
404 warning_time = atoi (optarg);
405 check_warning_time = TRUE;
406 break;
407 case 'C':
408 crit_codes = realloc (crit_codes, ++crit_codes_count);
409 crit_codes[crit_codes_count - 1] = optarg;
410 break;
411 case 'W':
412 warn_codes = realloc (warn_codes, ++warn_codes_count);
413 warn_codes[warn_codes_count - 1] = optarg;
414 break;
415 case 't': /* timeout */
416 if (!is_intpos (optarg))
417 usage ("Timeout interval must be a positive integer\n");
418 socket_timeout = atoi (optarg);
419 break;
420 case 'p': /* port */
421 if (!is_intpos (optarg))
422 usage ("Server port must be a positive integer\n");
423 server_port = atoi (optarg);
424 break;
425 case 's':
426 server_send = optarg;
427 break;
428 case 'e':
429 EXPECT = NULL;
430 if (server_expect_count == 0)
431 server_expect = malloc (++server_expect_count);
432 else
433 server_expect = realloc (server_expect, ++server_expect_count);
434 server_expect[server_expect_count - 1] = optarg;
435 break;
436 case 'q':
437 server_quit = optarg;
438 break;
439 case 'd':
440 if (is_intpos (optarg))
441 delay = atoi (optarg);
442 else
443 usage ("Delay must be a positive integer\n");
444 break;
445 case 'S':
446#ifndef HAVE_SSL
447 terminate (STATE_UNKNOWN,
448 "SSL support not available. Install OpenSSL and recompile.");
449#endif
450 use_ssl = TRUE;
451 break;
452 }
453 }
454
455 if (server_address == NULL)
456 usage ("You must provide a server address\n");
457
458 return OK;
459}
460
461
462
463
464
465void
466print_usage (void)
467{
468 printf
469 ("Usage: %s -H host -p port [-w warn_time] [-c crit_time] [-s send]\n"
470 " [-e expect] [-W wait] [-t to_sec] [-v]\n", PROGNAME);
471}
472
473
474
475
476
477void
478print_help (void)
479{
480 print_revision (PROGNAME, "$Revision$");
481 printf
482 ("Copyright (c) 1999 Ethan Galstad (nagios@nagios.org)\n\n"
483 "This plugin tests %s connections with the specified host.\n\n",
484 SERVICE);
485 print_usage ();
486 printf
487 ("Options:\n"
488 " -H, --hostname=ADDRESS\n"
489 " Host name argument for servers using host headers (use numeric\n"
490 " address if possible to bypass DNS lookup).\n"
491 " -p, --port=INTEGER\n"
492 " Port number\n"
493 " -s, --send=STRING\n"
494 " String to send to the server\n"
495 " -e, --expect=STRING\n"
496 " String to expect in server response"
497 " -W, --wait=INTEGER\n"
498 " Seconds to wait between sending string and polling for response\n"
499 " -w, --warning=INTEGER\n"
500 " Response time to result in warning status (seconds)\n"
501 " -c, --critical=INTEGER\n"
502 " Response time to result in critical status (seconds)\n"
503 " -t, --timeout=INTEGER\n"
504 " Seconds before connection times out (default: %d)\n"
505 " -v"
506 " Show details for command-line debugging (do not use with nagios server)\n"
507 " -h, --help\n"
508 " Print detailed help screen\n"
509 " -V, --version\n"
510 " Print version information\n", DEFAULT_SOCKET_TIMEOUT);
511}
512
513
514#ifdef HAVE_SSL
515int
516connect_SSL (void)
517{
518 SSL_METHOD *meth;
519
520 /* Initialize SSL context */
521 SSLeay_add_ssl_algorithms ();
522 meth = SSLv2_client_method ();
523 SSL_load_error_strings ();
524 if ((ctx = SSL_CTX_new (meth)) == NULL)
525 {
526 printf ("ERROR: Cannot create SSL context.\n");
527 return STATE_CRITICAL;
528 }
529
530 /* Initialize alarm signal handling */
531 signal (SIGALRM, socket_timeout_alarm_handler);
532
533 /* Set socket timeout */
534 alarm (socket_timeout);
535
536 /* Save start time */
537 time (&start_time);
538
539 /* Make TCP connection */
540 if (my_tcp_connect (server_address, server_port, &sd) == STATE_OK)
541 {
542 /* Do the SSL handshake */
543 if ((ssl = SSL_new (ctx)) != NULL)
544 {
545 SSL_set_fd (ssl, sd);
546 if (SSL_connect (ssl) != -1)
547 return OK;
548 ERR_print_errors_fp (stderr);
549 }
550 else
551 {
552 printf ("ERROR: Cannot initiate SSL handshake.\n");
553 }
554 SSL_free (ssl);
555 }
556
557 SSL_CTX_free (ctx);
558 close (sd);
559
560 return STATE_CRITICAL;
561}
562#endif
563