a7d8e6f215ccda27948935b4f16e9df0620000f8
1 /******************************************************************************
2 *
3 * This program is free software; you can redistribute it and/or modify
4 * it under the terms of the GNU General Public License as published by
5 * the Free Software Foundation; either version 2 of the License, or
6 * (at your option) any later version.
7 *
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
12 *
13 * You should have received a copy of the GNU General Public License
14 * along with this program; if not, write to the Free Software
15 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
16 *
17 *****************************************************************************/
19 /* progname changes depending on symlink called */
20 char *progname = "check_tcp";
21 const char *revision = "$Revision$";
22 const char *copyright = "2002-2003";
23 const char *authors = "Nagios Plugin Development Team";
24 const char *email = "nagiosplug-devel@lists.sourceforge.net";
26 const char *summary = "\
27 This plugin tests %s connections with the specified host.\n";
29 const char *option_summary = "\
30 -H host -p port [-w warn_time] [-c crit_time] [-s send]\n\
31 [-e expect] [-W wait] [-t to_sec] [-v]\n";
33 const char *options = "\
34 -H, --hostname=ADDRESS\n\
35 Host name argument for servers using host headers (use numeric\n\
36 address if possible to bypass DNS lookup).\n\
37 -p, --port=INTEGER\n\
38 Port number\n\
39 -s, --send=STRING\n\
40 String to send to the server\n\
41 -e, --expect=STRING\n\
42 String to expect in server response\n\
43 -W, --wait=INTEGER\n\
44 Seconds to wait between sending string and polling for response\n\
45 -w, --warning=DOUBLE\n\
46 Response time to result in warning status (seconds)\n\
47 -c, --critical=DOUBLE\n\
48 Response time to result in critical status (seconds)\n\
49 -t, --timeout=INTEGER\n\
50 Seconds before connection times out (default: %d)\n\
51 -v\n\
52 Show details for command-line debugging (do not use with nagios server)\n\
53 -h, --help\n\
54 Print detailed help screen\n\
55 -V, --version\n\
56 Print version information";
58 #include "config.h"
59 #include "common.h"
60 #include "netutils.h"
61 #include "utils.h"
63 #ifdef HAVE_SSL_H
64 #include <rsa.h>
65 #include <crypto.h>
66 #include <x509.h>
67 #include <pem.h>
68 #include <ssl.h>
69 #include <err.h>
70 #endif
72 #ifdef HAVE_OPENSSL_SSL_H
73 #include <openssl/rsa.h>
74 #include <openssl/crypto.h>
75 #include <openssl/x509.h>
76 #include <openssl/pem.h>
77 #include <openssl/ssl.h>
78 #include <openssl/err.h>
79 #endif
81 #ifdef HAVE_SSL
82 SSL_CTX *ctx;
83 SSL *ssl;
84 int connect_SSL (void);
85 #endif
87 enum {
88 TCP_PROTOCOL = 1,
89 UDP_PROTOCOL = 2,
90 MAXBUF = 1024
91 };
93 int process_arguments (int, char **);
94 void print_usage (void);
95 void print_help (void);
96 int my_recv (void);
98 char *SERVICE = NULL;
99 char *SEND = NULL;
100 char *EXPECT = NULL;
101 char *QUIT = NULL;
102 int PROTOCOL = 0;
103 int PORT = 0;
105 int server_port = 0;
106 char *server_address = NULL;
107 char *server_send = NULL;
108 char *server_quit = NULL;
109 char **server_expect = NULL;
110 int server_expect_count = 0;
111 char **warn_codes = NULL;
112 int warn_codes_count = 0;
113 char **crit_codes = NULL;
114 int crit_codes_count = 0;
115 int delay = 0;
116 double warning_time = 0;
117 int check_warning_time = FALSE;
118 double critical_time = 0;
119 int check_critical_time = FALSE;
120 double elapsed_time = 0;
121 int verbose = FALSE;
122 int use_ssl = FALSE;
123 int sd = 0;
124 char *buffer = "";
126 int
127 main (int argc, char **argv)
128 {
129 int result;
130 int i;
131 char *status = "";
132 struct timeval tv;
134 if (strstr (argv[0], "check_udp")) {
135 asprintf (&progname, "check_udp");
136 asprintf (&SERVICE, "UDP");
137 SEND = NULL;
138 EXPECT = NULL;
139 QUIT = NULL;
140 PROTOCOL = UDP_PROTOCOL;
141 PORT = 0;
142 }
143 else if (strstr (argv[0], "check_tcp")) {
144 asprintf (&progname, "check_tcp");
145 asprintf (&SERVICE, "TCP");
146 SEND = NULL;
147 EXPECT = NULL;
148 QUIT = NULL;
149 PROTOCOL = TCP_PROTOCOL;
150 PORT = 0;
151 }
152 else if (strstr (argv[0], "check_ftp")) {
153 asprintf (&progname, "check_ftp");
154 asprintf (&SERVICE, "FTP");
155 SEND = NULL;
156 asprintf (&EXPECT, "220");
157 asprintf (&QUIT, "QUIT\r\n");
158 PROTOCOL = TCP_PROTOCOL;
159 PORT = 21;
160 }
161 else if (strstr (argv[0], "check_smtp")) {
162 asprintf (&progname, "check_smtp");
163 asprintf (&SERVICE, "SMTP");
164 SEND = NULL;
165 asprintf (&EXPECT, "220");
166 asprintf (&QUIT, "QUIT\r\n");
167 PROTOCOL = TCP_PROTOCOL;
168 PORT = 25;
169 }
170 else if (strstr (argv[0], "check_pop")) {
171 asprintf (&progname, "check_pop");
172 asprintf (&SERVICE, "POP");
173 SEND = NULL;
174 asprintf (&EXPECT, "+OK");
175 asprintf (&QUIT, "QUIT\r\n");
176 PROTOCOL = TCP_PROTOCOL;
177 PORT = 110;
178 }
179 else if (strstr (argv[0], "check_imap")) {
180 asprintf (&progname, "check_imap");
181 asprintf (&SERVICE, "IMAP");
182 SEND = NULL;
183 asprintf (&EXPECT, "* OK");
184 asprintf (&QUIT, "a1 LOGOUT\r\n");
185 PROTOCOL = TCP_PROTOCOL;
186 PORT = 143;
187 }
188 #ifdef HAVE_SSL
189 else if (strstr(argv[0],"check_simap")) {
190 asprintf (&progname, "check_simap");
191 asprintf (&SERVICE, "SIMAP");
192 SEND=NULL;
193 asprintf (&EXPECT, "* OK");
194 asprintf (&QUIT, "a1 LOGOUT\r\n");
195 PROTOCOL=TCP_PROTOCOL;
196 use_ssl=TRUE;
197 PORT=993;
198 }
199 else if (strstr(argv[0],"check_spop")) {
200 asprintf (&progname, "check_spop");
201 asprintf (&SERVICE, "SPOP");
202 SEND=NULL;
203 asprintf (&EXPECT, "+OK");
204 asprintf (&QUIT, "QUIT\r\n");
205 PROTOCOL=TCP_PROTOCOL;
206 use_ssl=TRUE;
207 PORT=995;
208 }
209 #endif
210 else if (strstr (argv[0], "check_nntp")) {
211 asprintf (&progname, "check_nntp");
212 asprintf (&SERVICE, "NNTP");
213 SEND = NULL;
214 EXPECT = NULL;
215 server_expect = realloc (server_expect, ++server_expect_count);
216 asprintf (&server_expect[server_expect_count - 1], "200");
217 server_expect = realloc (server_expect, ++server_expect_count);
218 asprintf (&server_expect[server_expect_count - 1], "201");
219 asprintf (&QUIT, "QUIT\r\n");
220 PROTOCOL = TCP_PROTOCOL;
221 PORT = 119;
222 }
223 else {
224 usage ("ERROR: Generic check_tcp called with unknown service\n");
225 }
227 asprintf (&server_address, "127.0.0.1");
228 server_port = PORT;
229 server_send = SEND;
230 server_quit = QUIT;
232 if (process_arguments (argc, argv) == ERROR)
233 usage ("Could not parse arguments\n");
235 /* use default expect if none listed in process_arguments() */
236 if (EXPECT && server_expect_count == 0) {
237 server_expect = malloc (++server_expect_count);
238 server_expect[server_expect_count - 1] = EXPECT;
239 }
241 /* initialize alarm signal handling */
242 signal (SIGALRM, socket_timeout_alarm_handler);
244 /* set socket timeout */
245 alarm (socket_timeout);
247 /* try to connect to the host at the given port number */
248 gettimeofday (&tv, NULL);
249 #ifdef HAVE_SSL
250 if (use_ssl)
251 result = connect_SSL ();
252 else
253 #endif
254 {
255 if (PROTOCOL == UDP_PROTOCOL)
256 result = my_udp_connect (server_address, server_port, &sd);
257 else
258 /* default is TCP */
259 result = my_tcp_connect (server_address, server_port, &sd);
260 }
262 if (result == STATE_CRITICAL)
263 return STATE_CRITICAL;
265 if (server_send != NULL) { /* Something to send? */
266 asprintf (&server_send, "%s\r\n", server_send);
267 #ifdef HAVE_SSL
268 if (use_ssl)
269 SSL_write(ssl, server_send, strlen (server_send));
270 else
271 #endif
272 send (sd, server_send, strlen (server_send), 0);
273 }
275 if (delay > 0) {
276 tv.tv_sec += delay;
277 sleep (delay);
278 }
280 if (server_send || server_expect_count > 0) {
282 buffer = malloc (MAXBUF);
283 memset (buffer, '\0', MAXBUF);
284 /* watch for the expect string */
285 while ((i = my_recv ()) > 0) {
286 buffer[i] = '\0';
287 asprintf (&status, "%s%s", status, buffer);
288 if (buffer[i-2] == '\r' && buffer[i-1] == '\n')
289 break;
290 }
292 /* return a CRITICAL status if we couldn't read any data */
293 if (status == NULL)
294 terminate (STATE_CRITICAL, "No data received from host\n");
296 strip (status);
298 if (status && verbose)
299 printf ("%s\n", status);
301 if (server_expect_count > 0) {
302 for (i = 0;; i++) {
303 if (verbose)
304 printf ("%d %d\n", i, server_expect_count);
305 if (i >= server_expect_count)
306 terminate (STATE_WARNING, "Invalid response from host\n");
307 if (strstr (status, server_expect[i]))
308 break;
309 }
310 }
311 }
313 if (server_quit != NULL)
314 #ifdef HAVE_SSL
315 if (use_ssl) {
316 SSL_write (ssl, QUIT, strlen (QUIT));
317 SSL_shutdown (ssl);
318 SSL_free (ssl);
319 SSL_CTX_free (ctx);
320 }
321 else
322 #endif
323 send (sd, server_quit, strlen (server_quit), 0);
325 /* close the connection */
326 if (sd)
327 close (sd);
329 elapsed_time = delta_time (tv);
331 if (check_critical_time == TRUE && elapsed_time > critical_time)
332 result = STATE_CRITICAL;
333 else if (check_warning_time == TRUE && elapsed_time > warning_time)
334 result = STATE_WARNING;
336 /* reset the alarm */
337 alarm (0);
339 printf
340 ("%s %s - %7.3f second response time on port %d",
341 SERVICE,
342 state_text (result), elapsed_time, server_port);
344 if (status && strlen(status) > 0)
345 printf (" [%s]", status);
347 printf ("|time=%7.3f\n", elapsed_time);
349 return result;
350 }
358 /* process command-line arguments */
359 int
360 process_arguments (int argc, char **argv)
361 {
362 int c;
364 int option_index = 0;
365 static struct option long_options[] = {
366 {"hostname", required_argument, 0, 'H'},
367 {"critical-time", required_argument, 0, 'c'},
368 {"warning-time", required_argument, 0, 'w'},
369 {"critical-codes", required_argument, 0, 'C'},
370 {"warning-codes", required_argument, 0, 'W'},
371 {"timeout", required_argument, 0, 't'},
372 {"protocol", required_argument, 0, 'P'},
373 {"port", required_argument, 0, 'p'},
374 {"send", required_argument, 0, 's'},
375 {"expect", required_argument, 0, 'e'},
376 {"quit", required_argument, 0, 'q'},
377 {"delay", required_argument, 0, 'd'},
378 {"verbose", no_argument, 0, 'v'},
379 {"version", no_argument, 0, 'V'},
380 {"help", no_argument, 0, 'h'},
381 {0, 0, 0, 0}
382 };
384 if (argc < 2)
385 usage ("No arguments found\n");
387 /* backwards compatibility */
388 for (c = 1; c < argc; c++) {
389 if (strcmp ("-to", argv[c]) == 0)
390 strcpy (argv[c], "-t");
391 else if (strcmp ("-wt", argv[c]) == 0)
392 strcpy (argv[c], "-w");
393 else if (strcmp ("-ct", argv[c]) == 0)
394 strcpy (argv[c], "-c");
395 }
397 if (!is_option (argv[1])) {
398 server_address = argv[1];
399 argv[1] = argv[0];
400 argv = &argv[1];
401 argc--;
402 }
404 while (1) {
405 c = getopt_long (argc, argv, "+hVvH:s:e:q:c:w:t:p:C:W:d:S", long_options,
406 &option_index);
408 if (c == -1 || c == EOF || c == 1)
409 break;
411 switch (c) {
412 case '?': /* print short usage statement if args not parsable */
413 printf ("%s: Unknown argument: %s\n\n", progname, optarg);
414 print_usage ();
415 exit (STATE_UNKNOWN);
416 case 'h': /* help */
417 print_help ();
418 exit (STATE_OK);
419 case 'V': /* version */
420 print_revision (progname, "$Revision$");
421 exit (STATE_OK);
422 case 'v': /* verbose mode */
423 verbose = TRUE;
424 break;
425 case 'H': /* hostname */
426 if (is_host (optarg) == FALSE)
427 usage2 ("invalid host name or address", optarg);
428 server_address = optarg;
429 break;
430 case 'c': /* critical */
431 if (!is_intnonneg (optarg))
432 usage ("Critical threshold must be a nonnegative integer\n");
433 critical_time = strtod (optarg, NULL);
434 check_critical_time = TRUE;
435 break;
436 case 'w': /* warning */
437 if (!is_intnonneg (optarg))
438 usage ("Warning threshold must be a nonnegative integer\n");
439 warning_time = strtod (optarg, NULL);
440 check_warning_time = TRUE;
441 break;
442 case 'C':
443 crit_codes = realloc (crit_codes, ++crit_codes_count);
444 crit_codes[crit_codes_count - 1] = optarg;
445 break;
446 case 'W':
447 warn_codes = realloc (warn_codes, ++warn_codes_count);
448 warn_codes[warn_codes_count - 1] = optarg;
449 break;
450 case 't': /* timeout */
451 if (!is_intpos (optarg))
452 usage ("Timeout interval must be a positive integer\n");
453 socket_timeout = atoi (optarg);
454 break;
455 case 'p': /* port */
456 if (!is_intpos (optarg))
457 usage ("Server port must be a positive integer\n");
458 server_port = atoi (optarg);
459 break;
460 case 's':
461 server_send = optarg;
462 break;
463 case 'e': /* expect string (may be repeated) */
464 EXPECT = NULL;
465 if (server_expect_count == 0)
466 server_expect = malloc (++server_expect_count);
467 else
468 server_expect = realloc (server_expect, ++server_expect_count);
469 server_expect[server_expect_count - 1] = optarg;
470 break;
471 case 'q':
472 server_quit = optarg;
473 break;
474 case 'd':
475 if (is_intpos (optarg))
476 delay = atoi (optarg);
477 else
478 usage ("Delay must be a positive integer\n");
479 break;
480 case 'S':
481 #ifndef HAVE_SSL
482 terminate (STATE_UNKNOWN,
483 "SSL support not available. Install OpenSSL and recompile.");
484 #endif
485 use_ssl = TRUE;
486 break;
487 }
488 }
490 if (server_address == NULL)
491 usage ("You must provide a server address\n");
493 return OK;
494 }
496 void
497 print_help (void)
498 {
499 print_revision (progname, revision);
500 printf ("Copyright (c) %s %s\n\t<%s>\n\n",
501 copyright, authors, email);
502 printf (summary, SERVICE);
503 print_usage ();
504 printf ("\nOptions:\n");
505 printf (options, DEFAULT_SOCKET_TIMEOUT);
506 support ();
507 }
509 void
510 print_usage (void)
511 {
512 printf
513 ("Usage: %s %s\n"
514 " %s (-h|--help)\n"
515 " %s (-V|--version)\n", progname, option_summary, progname, progname);
516 }
518 #ifdef HAVE_SSL
519 int
520 connect_SSL (void)
521 {
522 SSL_METHOD *meth;
524 /* Initialize SSL context */
525 SSLeay_add_ssl_algorithms ();
526 meth = SSLv2_client_method ();
527 SSL_load_error_strings ();
528 if ((ctx = SSL_CTX_new (meth)) == NULL)
529 {
530 printf ("ERROR: Cannot create SSL context.\n");
531 return STATE_CRITICAL;
532 }
534 /* Initialize alarm signal handling */
535 signal (SIGALRM, socket_timeout_alarm_handler);
537 /* Set socket timeout */
538 alarm (socket_timeout);
540 /* Save start time */
541 time (&start_time);
543 /* Make TCP connection */
544 if (my_tcp_connect (server_address, server_port, &sd) == STATE_OK)
545 {
546 /* Do the SSL handshake */
547 if ((ssl = SSL_new (ctx)) != NULL)
548 {
549 SSL_set_fd (ssl, sd);
550 if (SSL_connect (ssl) != -1)
551 return OK;
552 ERR_print_errors_fp (stderr);
553 }
554 else
555 {
556 printf ("ERROR: Cannot initiate SSL handshake.\n");
557 }
558 SSL_free (ssl);
559 }
561 SSL_CTX_free (ctx);
562 close (sd);
564 return STATE_CRITICAL;
565 }
566 #endif
570 int
571 my_recv (void)
572 {
573 int i;
575 #ifdef HAVE_SSL
576 if (use_ssl) {
577 i = SSL_read (ssl, buffer, MAXBUF - 1);
578 }
579 else {
580 #endif
581 i = read (sd, buffer, MAXBUF - 1);
582 #ifdef HAVE_SSL
583 }
584 #endif
586 return i;
587 }