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 *****************************************************************************/
25 #define REVISION "$Revision$"
26 #define DESCRIPTION "Check a TCP port"
27 #define AUTHOR "Ethan Galstad"
28 #define EMAIL "nagios@nagios.org"
29 #define COPYRIGHTDATE "2002"
31 #include "config.h"
32 #include "common.h"
33 #include "netutils.h"
34 #include "utils.h"
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
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
54 #ifdef HAVE_SSL
55 SSL_CTX *ctx;
56 SSL *ssl;
57 int connect_SSL (void);
58 #endif
60 enum {
61 TCP_PROTOCOL = 1,
62 UDP_PROTOCOL = 2,
63 MAXBUF = 1024
64 };
66 int process_arguments (int, char **);
67 void print_usage (void);
68 void print_help (void);
69 int my_recv (void);
71 char *progname = "check_tcp";
72 char *SERVICE = NULL;
73 char *SEND = NULL;
74 char *EXPECT = NULL;
75 char *QUIT = NULL;
76 int PROTOCOL = 0;
77 int PORT = 0;
79 int server_port = 0;
80 char *server_address = NULL;
81 char *server_send = NULL;
82 char *server_quit = NULL;
83 char **server_expect = NULL;
84 int server_expect_count = 0;
85 char **warn_codes = NULL;
86 int warn_codes_count = 0;
87 char **crit_codes = NULL;
88 int crit_codes_count = 0;
89 int delay = 0;
90 double warning_time = 0;
91 int check_warning_time = FALSE;
92 double critical_time = 0;
93 int check_critical_time = FALSE;
94 double elapsed_time = 0;
95 int verbose = FALSE;
96 int use_ssl = FALSE;
97 int sd = 0;
98 char *buffer = "";
100 int
101 main (int argc, char **argv)
102 {
103 int result;
104 int i;
105 char *status = "";
106 struct timeval tv;
108 if (strstr (argv[0], "check_udp")) {
109 asprintf (&progname, "check_udp");
110 asprintf (&SERVICE, "UDP");
111 SEND = NULL;
112 EXPECT = NULL;
113 QUIT = NULL;
114 PROTOCOL = UDP_PROTOCOL;
115 PORT = 0;
116 }
117 else if (strstr (argv[0], "check_tcp")) {
118 asprintf (&progname, "check_tcp");
119 asprintf (&SERVICE, "TCP");
120 SEND = NULL;
121 EXPECT = NULL;
122 QUIT = NULL;
123 PROTOCOL = TCP_PROTOCOL;
124 PORT = 0;
125 }
126 else if (strstr (argv[0], "check_ftp")) {
127 asprintf (&progname, "check_ftp");
128 asprintf (&SERVICE, "FTP");
129 SEND = NULL;
130 asprintf (&EXPECT, "220");
131 asprintf (&QUIT, "QUIT\r\n");
132 PROTOCOL = TCP_PROTOCOL;
133 PORT = 21;
134 }
135 else if (strstr (argv[0], "check_smtp")) {
136 asprintf (&progname, "check_smtp");
137 asprintf (&SERVICE, "SMTP");
138 SEND = NULL;
139 asprintf (&EXPECT, "220");
140 asprintf (&QUIT, "QUIT\r\n");
141 PROTOCOL = TCP_PROTOCOL;
142 PORT = 25;
143 }
144 else if (strstr (argv[0], "check_pop")) {
145 asprintf (&progname, "check_pop");
146 asprintf (&SERVICE, "POP");
147 SEND = NULL;
148 asprintf (&EXPECT, "+OK");
149 asprintf (&QUIT, "QUIT\r\n");
150 PROTOCOL = TCP_PROTOCOL;
151 PORT = 110;
152 }
153 else if (strstr (argv[0], "check_imap")) {
154 asprintf (&progname, "check_imap");
155 asprintf (&SERVICE, "IMAP");
156 SEND = NULL;
157 asprintf (&EXPECT, "* OK");
158 asprintf (&QUIT, "a1 LOGOUT\r\n");
159 PROTOCOL = TCP_PROTOCOL;
160 PORT = 143;
161 }
162 #ifdef HAVE_SSL
163 else if (strstr(argv[0],"check_simap")) {
164 asprintf (&progname, "check_simap");
165 asprintf (&SERVICE, "SIMAP");
166 SEND=NULL;
167 asprintf (&EXPECT, "* OK");
168 asprintf (&QUIT, "a1 LOGOUT\r\n");
169 PROTOCOL=TCP_PROTOCOL;
170 use_ssl=TRUE;
171 PORT=993;
172 }
173 else if (strstr(argv[0],"check_spop")) {
174 asprintf (&progname, "check_spop");
175 asprintf (&SERVICE, "SPOP");
176 SEND=NULL;
177 asprintf (&EXPECT, "+OK");
178 asprintf (&QUIT, "QUIT\r\n");
179 PROTOCOL=TCP_PROTOCOL;
180 use_ssl=TRUE;
181 PORT=995;
182 }
183 #endif
184 else if (strstr (argv[0], "check_nntp")) {
185 asprintf (&progname, "check_nntp");
186 asprintf (&SERVICE, "NNTP");
187 SEND = NULL;
188 EXPECT = NULL;
189 server_expect = realloc (server_expect, ++server_expect_count);
190 asprintf (&server_expect[server_expect_count - 1], "200");
191 server_expect = realloc (server_expect, ++server_expect_count);
192 asprintf (&server_expect[server_expect_count - 1], "201");
193 asprintf (&QUIT, "QUIT\r\n");
194 PROTOCOL = TCP_PROTOCOL;
195 PORT = 119;
196 }
197 else {
198 usage ("ERROR: Generic check_tcp called with unknown service\n");
199 }
201 asprintf (&server_address, "127.0.0.1");
202 server_port = PORT;
203 server_send = SEND;
204 server_quit = QUIT;
206 if (process_arguments (argc, argv) == ERROR)
207 usage ("Could not parse arguments\n");
209 /* use default expect if none listed in process_arguments() */
210 if (EXPECT && server_expect_count == 0) {
211 server_expect = malloc (++server_expect_count);
212 server_expect[server_expect_count - 1] = EXPECT;
213 }
215 /* initialize alarm signal handling */
216 signal (SIGALRM, socket_timeout_alarm_handler);
218 /* set socket timeout */
219 alarm (socket_timeout);
221 /* try to connect to the host at the given port number */
222 gettimeofday (&tv, NULL);
223 #ifdef HAVE_SSL
224 if (use_ssl)
225 result = connect_SSL ();
226 else
227 #endif
228 {
229 if (PROTOCOL == UDP_PROTOCOL)
230 result = my_udp_connect (server_address, server_port, &sd);
231 else
232 /* default is TCP */
233 result = my_tcp_connect (server_address, server_port, &sd);
234 }
236 if (result == STATE_CRITICAL)
237 return STATE_CRITICAL;
239 if (server_send != NULL) { /* Something to send? */
240 asprintf (&server_send, "%s\r\n", server_send);
241 #ifdef HAVE_SSL
242 if (use_ssl)
243 SSL_write(ssl, server_send, strlen (server_send));
244 else
245 #endif
246 send (sd, server_send, strlen (server_send), 0);
247 }
249 if (delay > 0) {
250 tv.tv_sec += delay;
251 sleep (delay);
252 }
254 if (server_send || server_expect_count > 0) {
256 buffer = malloc (MAXBUF);
257 memset (buffer, '\0', MAXBUF);
258 /* watch for the expect string */
259 while ((i = my_recv ()) > 0) {
260 buffer[i] = '\0';
261 asprintf (&status, "%s%s", status, buffer);
262 if (buffer[i-2] == '\r' && buffer[i-1] == '\n')
263 break;
264 }
266 /* return a CRITICAL status if we couldn't read any data */
267 if (status == NULL)
268 terminate (STATE_CRITICAL, "No data received from host\n");
270 strip (status);
272 if (status && verbose)
273 printf ("%s\n", status);
275 if (server_expect_count > 0) {
276 for (i = 0;; i++) {
277 if (verbose)
278 printf ("%d %d\n", i, server_expect_count);
279 if (i >= server_expect_count)
280 terminate (STATE_WARNING, "Invalid response from host\n");
281 if (strstr (status, server_expect[i]))
282 break;
283 }
284 }
285 }
287 if (server_quit != NULL)
288 #ifdef HAVE_SSL
289 if (use_ssl) {
290 SSL_write (ssl, QUIT, strlen (QUIT));
291 SSL_shutdown (ssl);
292 SSL_free (ssl);
293 SSL_CTX_free (ctx);
294 }
295 else
296 #endif
297 send (sd, server_quit, strlen (server_quit), 0);
299 /* close the connection */
300 if (sd)
301 close (sd);
303 elapsed_time = delta_time (tv);
305 if (check_critical_time == TRUE && elapsed_time > critical_time)
306 result = STATE_CRITICAL;
307 else if (check_warning_time == TRUE && elapsed_time > warning_time)
308 result = STATE_WARNING;
310 /* reset the alarm */
311 alarm (0);
313 printf
314 ("%s %s - %7.3f second response time on port %d",
315 SERVICE,
316 state_text (result), elapsed_time, server_port);
318 if (status && strlen(status) > 0)
319 printf (" [%s]", status);
321 printf ("|time=%7.3f\n", elapsed_time);
323 return result;
324 }
332 /* process command-line arguments */
333 int
334 process_arguments (int argc, char **argv)
335 {
336 int c;
338 int option_index = 0;
339 static struct option long_options[] = {
340 {"hostname", required_argument, 0, 'H'},
341 {"critical-time", required_argument, 0, 'c'},
342 {"warning-time", required_argument, 0, 'w'},
343 {"critical-codes", required_argument, 0, 'C'},
344 {"warning-codes", required_argument, 0, 'W'},
345 {"timeout", required_argument, 0, 't'},
346 {"protocol", required_argument, 0, 'P'},
347 {"port", required_argument, 0, 'p'},
348 {"send", required_argument, 0, 's'},
349 {"expect", required_argument, 0, 'e'},
350 {"quit", required_argument, 0, 'q'},
351 {"delay", required_argument, 0, 'd'},
352 {"verbose", no_argument, 0, 'v'},
353 {"version", no_argument, 0, 'V'},
354 {"help", no_argument, 0, 'h'},
355 {0, 0, 0, 0}
356 };
358 if (argc < 2)
359 usage ("No arguments found\n");
361 /* backwards compatibility */
362 for (c = 1; c < argc; c++) {
363 if (strcmp ("-to", argv[c]) == 0)
364 strcpy (argv[c], "-t");
365 else if (strcmp ("-wt", argv[c]) == 0)
366 strcpy (argv[c], "-w");
367 else if (strcmp ("-ct", argv[c]) == 0)
368 strcpy (argv[c], "-c");
369 }
371 if (!is_option (argv[1])) {
372 server_address = argv[1];
373 argv[1] = argv[0];
374 argv = &argv[1];
375 argc--;
376 }
378 while (1) {
379 c = getopt_long (argc, argv, "+hVvH:s:e:q:c:w:t:p:C:W:d:S", long_options,
380 &option_index);
382 if (c == -1 || c == EOF || c == 1)
383 break;
385 switch (c) {
386 case '?': /* print short usage statement if args not parsable */
387 printf ("%s: Unknown argument: %s\n\n", progname, optarg);
388 print_usage ();
389 exit (STATE_UNKNOWN);
390 case 'h': /* help */
391 print_help ();
392 exit (STATE_OK);
393 case 'V': /* version */
394 print_revision (progname, "$Revision$");
395 exit (STATE_OK);
396 case 'v': /* verbose mode */
397 verbose = TRUE;
398 break;
399 case 'H': /* hostname */
400 if (is_host (optarg) == FALSE)
401 usage2 ("invalid host name or address", optarg);
402 server_address = optarg;
403 break;
404 case 'c': /* critical */
405 if (!is_intnonneg (optarg))
406 usage ("Critical threshold must be a nonnegative integer\n");
407 critical_time = strtod (optarg, NULL);
408 check_critical_time = TRUE;
409 break;
410 case 'w': /* warning */
411 if (!is_intnonneg (optarg))
412 usage ("Warning threshold must be a nonnegative integer\n");
413 warning_time = strtod (optarg, NULL);
414 check_warning_time = TRUE;
415 break;
416 case 'C':
417 crit_codes = realloc (crit_codes, ++crit_codes_count);
418 crit_codes[crit_codes_count - 1] = optarg;
419 break;
420 case 'W':
421 warn_codes = realloc (warn_codes, ++warn_codes_count);
422 warn_codes[warn_codes_count - 1] = optarg;
423 break;
424 case 't': /* timeout */
425 if (!is_intpos (optarg))
426 usage ("Timeout interval must be a positive integer\n");
427 socket_timeout = atoi (optarg);
428 break;
429 case 'p': /* port */
430 if (!is_intpos (optarg))
431 usage ("Server port must be a positive integer\n");
432 server_port = atoi (optarg);
433 break;
434 case 's':
435 server_send = optarg;
436 break;
437 case 'e': /* expect string (may be repeated) */
438 EXPECT = NULL;
439 if (server_expect_count == 0)
440 server_expect = malloc (++server_expect_count);
441 else
442 server_expect = realloc (server_expect, ++server_expect_count);
443 server_expect[server_expect_count - 1] = optarg;
444 break;
445 case 'q':
446 server_quit = optarg;
447 break;
448 case 'd':
449 if (is_intpos (optarg))
450 delay = atoi (optarg);
451 else
452 usage ("Delay must be a positive integer\n");
453 break;
454 case 'S':
455 #ifndef HAVE_SSL
456 terminate (STATE_UNKNOWN,
457 "SSL support not available. Install OpenSSL and recompile.");
458 #endif
459 use_ssl = TRUE;
460 break;
461 }
462 }
464 if (server_address == NULL)
465 usage ("You must provide a server address\n");
467 return OK;
468 }
474 void
475 print_usage (void)
476 {
477 printf
478 ("Usage: %s -H host -p port [-w warn_time] [-c crit_time] [-s send]\n"
479 " [-e expect] [-W wait] [-t to_sec] [-v]\n", progname);
480 }
486 void
487 print_help (void)
488 {
489 print_revision (progname, "$Revision$");
490 printf
491 ("Copyright (c) 1999 Ethan Galstad (nagios@nagios.org)\n\n"
492 "This plugin tests %s connections with the specified host.\n\n",
493 SERVICE);
494 print_usage ();
495 printf
496 ("Options:\n"
497 " -H, --hostname=ADDRESS\n"
498 " Host name argument for servers using host headers (use numeric\n"
499 " address if possible to bypass DNS lookup).\n"
500 " -p, --port=INTEGER\n"
501 " Port number\n"
502 " -s, --send=STRING\n"
503 " String to send to the server\n"
504 " -e, --expect=STRING\n"
505 " String to expect in server response"
506 " -W, --wait=INTEGER\n"
507 " Seconds to wait between sending string and polling for response\n"
508 " -w, --warning=DOUBLE\n"
509 " Response time to result in warning status (seconds)\n"
510 " -c, --critical=DOUBLE\n"
511 " Response time to result in critical status (seconds)\n"
512 " -t, --timeout=INTEGER\n"
513 " Seconds before connection times out (default: %d)\n"
514 " -v"
515 " Show details for command-line debugging (do not use with nagios server)\n"
516 " -h, --help\n"
517 " Print detailed help screen\n"
518 " -V, --version\n"
519 " Print version information\n", DEFAULT_SOCKET_TIMEOUT);
520 }
523 #ifdef HAVE_SSL
524 int
525 connect_SSL (void)
526 {
527 SSL_METHOD *meth;
529 /* Initialize SSL context */
530 SSLeay_add_ssl_algorithms ();
531 meth = SSLv2_client_method ();
532 SSL_load_error_strings ();
533 if ((ctx = SSL_CTX_new (meth)) == NULL)
534 {
535 printf ("ERROR: Cannot create SSL context.\n");
536 return STATE_CRITICAL;
537 }
539 /* Initialize alarm signal handling */
540 signal (SIGALRM, socket_timeout_alarm_handler);
542 /* Set socket timeout */
543 alarm (socket_timeout);
545 /* Save start time */
546 time (&start_time);
548 /* Make TCP connection */
549 if (my_tcp_connect (server_address, server_port, &sd) == STATE_OK)
550 {
551 /* Do the SSL handshake */
552 if ((ssl = SSL_new (ctx)) != NULL)
553 {
554 SSL_set_fd (ssl, sd);
555 if (SSL_connect (ssl) != -1)
556 return OK;
557 ERR_print_errors_fp (stderr);
558 }
559 else
560 {
561 printf ("ERROR: Cannot initiate SSL handshake.\n");
562 }
563 SSL_free (ssl);
564 }
566 SSL_CTX_free (ctx);
567 close (sd);
569 return STATE_CRITICAL;
570 }
571 #endif
575 int
576 my_recv (void)
577 {
578 int i;
580 #ifdef HAVE_SSL
581 if (use_ssl) {
582 i = SSL_read (ssl, buffer, MAXBUF - 1);
583 }
584 else {
585 #endif
586 i = read (sd, buffer, MAXBUF - 1);
587 #ifdef HAVE_SSL
588 }
589 #endif
591 return i;
592 }