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 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"
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 #define TCP_PROTOCOL 1
61 #define UDP_PROTOCOL 2
63 int process_arguments (int, char **);
64 void print_usage (void);
65 void print_help (void);
67 char *PROGNAME = NULL;
68 char *SERVICE = NULL;
69 char *SEND = NULL;
70 char *EXPECT = NULL;
71 char *QUIT = NULL;
72 int PROTOCOL = 0;
73 int PORT = 0;
75 int server_port = 0;
76 char *server_address = NULL;
77 char *server_send = NULL;
78 char *server_quit = NULL;
79 char **server_expect = NULL;
80 int server_expect_count = 0;
81 char **warn_codes = NULL;
82 int warn_codes_count = 0;
83 char **crit_codes = NULL;
84 int crit_codes_count = 0;
85 int delay = 0;
86 double warning_time = 0;
87 int check_warning_time = FALSE;
88 double critical_time = 0;
89 int check_critical_time = FALSE;
90 double elapsed_time = 0;
91 int verbose = FALSE;
92 int use_ssl = FALSE;
93 int sd;
95 int
96 main (int argc, char **argv)
97 {
98 int result;
99 int i;
100 char buffer[MAX_INPUT_BUFFER] = "";
101 char *status = NULL;
102 char *output = NULL;
103 char *ptr = NULL;
104 struct timeval tv;
106 if (strstr (argv[0], "check_udp")) {
107 PROGNAME = strscpy (PROGNAME, "check_udp");
108 SERVICE = strscpy (SERVICE, "UDP");
109 SEND = NULL;
110 EXPECT = NULL;
111 QUIT = NULL;
112 PROTOCOL = UDP_PROTOCOL;
113 PORT = 0;
114 }
115 else if (strstr (argv[0], "check_tcp")) {
116 PROGNAME = strscpy (PROGNAME, "check_tcp");
117 SERVICE = strscpy (SERVICE, "TCP");
118 SEND = NULL;
119 EXPECT = NULL;
120 QUIT = NULL;
121 PROTOCOL = TCP_PROTOCOL;
122 PORT = 0;
123 }
124 else if (strstr (argv[0], "check_ftp")) {
125 PROGNAME = strscpy (PROGNAME, "check_ftp");
126 SERVICE = strscpy (SERVICE, "FTP");
127 SEND = NULL;
128 EXPECT = strscpy (EXPECT, "220");
129 QUIT = strscpy (QUIT, "QUIT\r\n");
130 PROTOCOL = TCP_PROTOCOL;
131 PORT = 21;
132 }
133 else if (strstr (argv[0], "check_smtp")) {
134 PROGNAME = strscpy (PROGNAME, "check_smtp");
135 SERVICE = strscpy (SERVICE, "SMTP");
136 SEND = NULL;
137 EXPECT = strscpy (EXPECT, "220");
138 QUIT = strscpy (QUIT, "QUIT\r\n");
139 PROTOCOL = TCP_PROTOCOL;
140 PORT = 25;
141 }
142 else if (strstr (argv[0], "check_pop")) {
143 PROGNAME = strscpy (PROGNAME, "check_pop");
144 SERVICE = strscpy (SERVICE, "POP");
145 SEND = NULL;
146 EXPECT = strscpy (EXPECT, "110");
147 QUIT = strscpy (QUIT, "QUIT\r\n");
148 PROTOCOL = TCP_PROTOCOL;
149 PORT = 110;
150 }
151 else if (strstr (argv[0], "check_imap")) {
152 PROGNAME = strscpy (PROGNAME, "check_imap");
153 SERVICE = strscpy (SERVICE, "IMAP");
154 SEND = NULL;
155 EXPECT = strscpy (EXPECT, "* OK");
156 QUIT = strscpy (QUIT, "a1 LOGOUT\r\n");
157 PROTOCOL = TCP_PROTOCOL;
158 PORT = 143;
159 }
160 #ifdef HAVE_SSL
161 else if (strstr(argv[0],"check_simap")) {
162 PROGNAME=strscpy(PROGNAME,"check_simap");
163 SERVICE=strscpy(SERVICE,"SIMAP");
164 SEND=NULL;
165 EXPECT=strscpy(EXPECT,"* OK");
166 QUIT=strscpy(QUIT,"a1 LOGOUT\n");
167 PROTOCOL=TCP_PROTOCOL;
168 use_ssl=TRUE;
169 PORT=993;
170 }
171 #endif
172 else if (strstr (argv[0], "check_nntp")) {
173 PROGNAME = strscpy (PROGNAME, "check_nntp");
174 SERVICE = strscpy (SERVICE, "NNTP");
175 SEND = NULL;
176 EXPECT = NULL;
177 server_expect = realloc (server_expect, ++server_expect_count);
178 server_expect[server_expect_count - 1] = strscpy (EXPECT, "200");
179 server_expect = realloc (server_expect, ++server_expect_count);
180 server_expect[server_expect_count - 1] = strscpy (NULL, "201");
181 QUIT = strscpy (QUIT, "QUIT\r\n");
182 PROTOCOL = TCP_PROTOCOL;
183 PORT = 119;
184 }
185 else {
186 usage ("ERROR: Generic check_tcp called with unknown service\n");
187 }
189 server_address = strscpy (NULL, "127.0.0.1");
190 server_port = PORT;
191 server_send = SEND;
192 server_quit = QUIT;
194 if (process_arguments (argc, argv) == ERROR)
195 usage ("Could not parse arguments\n");
197 /* use default expect if none listed in process_arguments() */
198 if (EXPECT && server_expect_count == 0) {
199 server_expect = malloc (1);
200 server_expect[server_expect_count - 1] = EXPECT;
201 }
203 /* initialize alarm signal handling */
204 signal (SIGALRM, socket_timeout_alarm_handler);
206 /* set socket timeout */
207 alarm (socket_timeout);
209 /* try to connect to the host at the given port number */
210 gettimeofday (&tv, NULL);
211 #ifdef HAVE_SSL
212 if (use_ssl)
213 result = connect_SSL ();
214 else
215 #endif
216 {
217 if (PROTOCOL == UDP_PROTOCOL)
218 result = my_udp_connect (server_address, server_port, &sd);
219 else /* default is TCP */
220 result = my_tcp_connect (server_address, server_port, &sd);
221 }
223 if (result == STATE_CRITICAL)
224 return STATE_CRITICAL;
226 if (server_send != NULL) { /* Something to send? */
227 snprintf (buffer, MAX_INPUT_BUFFER - 1, "%s\r\n", server_send);
228 buffer[MAX_INPUT_BUFFER - 1] = 0;
229 #ifdef HAVE_SSL
230 if (use_ssl)
231 SSL_write(ssl,buffer,strlen(buffer));
232 else
233 #endif
234 send (sd, buffer, strlen (buffer), 0);
235 }
237 if (delay > 0) {
238 tv.tv_sec += delay;
239 sleep (delay);
240 }
242 if (server_send || server_expect_count > 0) {
244 asprintf (&status, "");
246 /* watch for the expect string */
247 #ifdef HAVE_SSL
248 if (use_ssl && SSL_read (ssl, buffer, MAX_INPUT_BUFFER - 1)>=0)
249 asprintf (&status, "%s%s", status, buffer);
250 else
251 #endif
252 {
253 if (recv (sd, buffer, MAX_INPUT_BUFFER - 1, 0) >= 0)
254 asprintf (&status, "%s%s", status, buffer);
255 }
256 strip (status);
258 /* return a CRITICAL status if we couldn't read any data */
259 if (status == NULL)
260 terminate (STATE_CRITICAL, "No data received from host\n");
262 if (status && verbose)
263 printf ("%s\n", status);
265 if (server_expect_count > 0) {
266 for (i = 0;; i++) {
267 if (verbose)
268 printf ("%d %d\n", i, server_expect_count);
269 if (i >= server_expect_count)
270 terminate (STATE_WARNING, "Invalid response from host\n");
271 if (strstr (status, server_expect[i]))
272 break;
273 }
274 }
275 }
277 if (server_quit)
278 #ifdef HAVE_SSL
279 if (use_ssl) {
280 SSL_write (ssl, QUIT, strlen (QUIT));
281 SSL_shutdown (ssl);
282 SSL_free (ssl);
283 SSL_CTX_free (ctx);
284 }
285 else
286 #endif
287 send (sd, server_quit, strlen (server_quit), 0);
289 /* close the connection */
290 close (sd);
292 elapsed_time = delta_time (tv);
294 if (check_critical_time == TRUE && elapsed_time > critical_time)
295 result = STATE_CRITICAL;
296 else if (check_warning_time == TRUE && elapsed_time > warning_time)
297 result = STATE_WARNING;
299 /* reset the alarm */
300 alarm (0);
302 printf
303 ("%s %s - %7.3f second response time on port %d",
304 SERVICE,
305 state_text (result), elapsed_time, server_port);
307 if (status)
308 printf (" [%s]", status);
310 printf ("|time=%7.3f\n", elapsed_time);
312 return result;
313 }
321 /* process command-line arguments */
322 int
323 process_arguments (int argc, char **argv)
324 {
325 int c;
327 #ifdef HAVE_GETOPT_H
328 int option_index = 0;
329 static struct option long_options[] = {
330 {"hostname", required_argument, 0, 'H'},
331 {"critical-time", required_argument, 0, 'c'},
332 {"warning-time", required_argument, 0, 'w'},
333 {"critical-codes", required_argument, 0, 'C'},
334 {"warning-codes", required_argument, 0, 'W'},
335 {"timeout", required_argument, 0, 't'},
336 {"protocol", required_argument, 0, 'P'},
337 {"port", required_argument, 0, 'p'},
338 {"send", required_argument, 0, 's'},
339 {"expect", required_argument, 0, 'e'},
340 {"quit", required_argument, 0, 'q'},
341 {"delay", required_argument, 0, 'd'},
342 {"verbose", no_argument, 0, 'v'},
343 {"version", no_argument, 0, 'V'},
344 {"help", no_argument, 0, 'h'},
345 {0, 0, 0, 0}
346 };
347 #endif
349 if (argc < 2)
350 usage ("No arguments found\n");
352 /* backwards compatibility */
353 for (c = 1; c < argc; c++) {
354 if (strcmp ("-to", argv[c]) == 0)
355 strcpy (argv[c], "-t");
356 else if (strcmp ("-wt", argv[c]) == 0)
357 strcpy (argv[c], "-w");
358 else if (strcmp ("-ct", argv[c]) == 0)
359 strcpy (argv[c], "-c");
360 }
362 if (!is_option (argv[1])) {
363 server_address = argv[1];
364 argv[1] = argv[0];
365 argv = &argv[1];
366 argc--;
367 }
369 while (1) {
370 #ifdef HAVE_GETOPT_H
371 c =
372 getopt_long (argc, argv, "+hVvH:s:e:q:c:w:t:p:C:W:d:S", long_options,
373 &option_index);
374 #else
375 c = getopt (argc, argv, "+hVvH:s:e:q:c:w:t:p:C:W:d:S");
376 #endif
378 if (c == -1 || c == EOF || c == 1)
379 break;
381 switch (c) {
382 case '?': /* print short usage statement if args not parsable */
383 printf ("%s: Unknown argument: %s\n\n", my_basename (argv[0]), optarg);
384 print_usage ();
385 exit (STATE_UNKNOWN);
386 case 'h': /* help */
387 print_help ();
388 exit (STATE_OK);
389 case 'V': /* version */
390 print_revision (PROGNAME, "$Revision$");
391 exit (STATE_OK);
392 case 'v': /* verbose mode */
393 verbose = TRUE;
394 break;
395 case 'H': /* hostname */
396 if (is_host (optarg) == FALSE)
397 usage ("Invalid host name/address\n");
398 server_address = optarg;
399 break;
400 case 'c': /* critical */
401 if (!is_intnonneg (optarg))
402 usage ("Critical threshold must be a nonnegative integer\n");
403 critical_time = strtod (optarg, NULL);
404 check_critical_time = TRUE;
405 break;
406 case 'w': /* warning */
407 if (!is_intnonneg (optarg))
408 usage ("Warning threshold must be a nonnegative integer\n");
409 warning_time = strtod (optarg, NULL);
410 check_warning_time = TRUE;
411 break;
412 case 'C':
413 crit_codes = realloc (crit_codes, ++crit_codes_count);
414 crit_codes[crit_codes_count - 1] = optarg;
415 break;
416 case 'W':
417 warn_codes = realloc (warn_codes, ++warn_codes_count);
418 warn_codes[warn_codes_count - 1] = optarg;
419 break;
420 case 't': /* timeout */
421 if (!is_intpos (optarg))
422 usage ("Timeout interval must be a positive integer\n");
423 socket_timeout = atoi (optarg);
424 break;
425 case 'p': /* port */
426 if (!is_intpos (optarg))
427 usage ("Server port must be a positive integer\n");
428 server_port = atoi (optarg);
429 break;
430 case 's':
431 server_send = optarg;
432 break;
433 case 'e': /* expect string (may be repeated) */
434 EXPECT = NULL;
435 if (server_expect_count == 0)
436 server_expect = malloc (++server_expect_count);
437 else
438 server_expect = realloc (server_expect, ++server_expect_count);
439 server_expect[server_expect_count - 1] = optarg;
440 break;
441 case 'q':
442 server_quit = optarg;
443 break;
444 case 'd':
445 if (is_intpos (optarg))
446 delay = atoi (optarg);
447 else
448 usage ("Delay must be a positive integer\n");
449 break;
450 case 'S':
451 #ifndef HAVE_SSL
452 terminate (STATE_UNKNOWN,
453 "SSL support not available. Install OpenSSL and recompile.");
454 #endif
455 use_ssl = TRUE;
456 break;
457 }
458 }
460 if (server_address == NULL)
461 usage ("You must provide a server address\n");
463 return OK;
464 }
470 void
471 print_usage (void)
472 {
473 printf
474 ("Usage: %s -H host -p port [-w warn_time] [-c crit_time] [-s send]\n"
475 " [-e expect] [-W wait] [-t to_sec] [-v]\n", PROGNAME);
476 }
482 void
483 print_help (void)
484 {
485 print_revision (PROGNAME, "$Revision$");
486 printf
487 ("Copyright (c) 1999 Ethan Galstad (nagios@nagios.org)\n\n"
488 "This plugin tests %s connections with the specified host.\n\n",
489 SERVICE);
490 print_usage ();
491 printf
492 ("Options:\n"
493 " -H, --hostname=ADDRESS\n"
494 " Host name argument for servers using host headers (use numeric\n"
495 " address if possible to bypass DNS lookup).\n"
496 " -p, --port=INTEGER\n"
497 " Port number\n"
498 " -s, --send=STRING\n"
499 " String to send to the server\n"
500 " -e, --expect=STRING\n"
501 " String to expect in server response"
502 " -W, --wait=INTEGER\n"
503 " Seconds to wait between sending string and polling for response\n"
504 " -w, --warning=DOUBLE\n"
505 " Response time to result in warning status (seconds)\n"
506 " -c, --critical=DOUBLE\n"
507 " Response time to result in critical status (seconds)\n"
508 " -t, --timeout=INTEGER\n"
509 " Seconds before connection times out (default: %d)\n"
510 " -v"
511 " Show details for command-line debugging (do not use with nagios server)\n"
512 " -h, --help\n"
513 " Print detailed help screen\n"
514 " -V, --version\n"
515 " Print version information\n", DEFAULT_SOCKET_TIMEOUT);
516 }
519 #ifdef HAVE_SSL
520 int
521 connect_SSL (void)
522 {
523 SSL_METHOD *meth;
525 /* Initialize SSL context */
526 SSLeay_add_ssl_algorithms ();
527 meth = SSLv2_client_method ();
528 SSL_load_error_strings ();
529 if ((ctx = SSL_CTX_new (meth)) == NULL)
530 {
531 printf ("ERROR: Cannot create SSL context.\n");
532 return STATE_CRITICAL;
533 }
535 /* Initialize alarm signal handling */
536 signal (SIGALRM, socket_timeout_alarm_handler);
538 /* Set socket timeout */
539 alarm (socket_timeout);
541 /* Save start time */
542 time (&start_time);
544 /* Make TCP connection */
545 if (my_tcp_connect (server_address, server_port, &sd) == STATE_OK)
546 {
547 /* Do the SSL handshake */
548 if ((ssl = SSL_new (ctx)) != NULL)
549 {
550 SSL_set_fd (ssl, sd);
551 if (SSL_connect (ssl) != -1)
552 return OK;
553 ERR_print_errors_fp (stderr);
554 }
555 else
556 {
557 printf ("ERROR: Cannot initiate SSL handshake.\n");
558 }
559 SSL_free (ssl);
560 }
562 SSL_CTX_free (ctx);
563 close (sd);
565 return STATE_CRITICAL;
566 }
567 #endif