afb1a681d01da37f2bb75e1b71d03062ae84d185
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 *****************************************************************************/
18 #include "config.h"
19 #include "common.h"
20 #include "netutils.h"
21 #include "utils.h"
23 #ifdef HAVE_SSL_H
24 # include <rsa.h>
25 # include <crypto.h>
26 # include <x509.h>
27 # include <pem.h>
28 # include <ssl.h>
29 # include <err.h>
30 #else
31 # ifdef HAVE_OPENSSL_SSL_H
32 # include <openssl/rsa.h>
33 # include <openssl/crypto.h>
34 # include <openssl/x509.h>
35 # include <openssl/pem.h>
36 # include <openssl/ssl.h>
37 # include <openssl/err.h>
38 # endif
39 #endif
41 #ifdef HAVE_SSL
42 SSL_CTX *ctx;
43 SSL *ssl;
44 int connect_SSL (void);
45 #endif
47 enum {
48 TCP_PROTOCOL = 1,
49 UDP_PROTOCOL = 2,
50 MAXBUF = 1024
51 };
53 int process_arguments (int, char **);
54 void print_usage (void);
55 void print_help (void);
56 int my_recv (void);
58 char *SERVICE = NULL;
59 char *SEND = NULL;
60 char *EXPECT = NULL;
61 char *QUIT = NULL;
62 int PROTOCOL = 0;
63 int PORT = 0;
65 int server_port = 0;
66 char *server_address = NULL;
67 char *server_send = NULL;
68 char *server_quit = NULL;
69 char **server_expect = NULL;
70 int server_expect_count = 0;
71 int maxbytes = 0;
72 char **warn_codes = NULL;
73 int warn_codes_count = 0;
74 char **crit_codes = NULL;
75 int crit_codes_count = 0;
76 int delay = 0;
77 double warning_time = 0;
78 int check_warning_time = FALSE;
79 double critical_time = 0;
80 int check_critical_time = FALSE;
81 double elapsed_time = 0;
82 int verbose = FALSE;
83 int use_ssl = FALSE;
84 int sd = 0;
85 char *buffer = "";
87 /* progname changes depending on symlink called */
88 char *progname = "check_tcp";
89 const char *revision = "$Revision$";
90 const char *copyright = "2002-2003";
91 const char *authors = "Nagios Plugin Development Team";
92 const char *email = "nagiosplug-devel@lists.sourceforge.net";
94 int
95 main (int argc, char **argv)
96 {
97 int result;
98 int i;
99 char *status = "";
100 struct timeval tv;
102 setlocale (LC_ALL, "");
103 bindtextdomain (PACKAGE, LOCALEDIR);
104 textdomain (PACKAGE);
106 if (strstr (argv[0], "check_udp")) {
107 progname = strdup ("check_udp");
108 SERVICE = strdup ("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 = strdup ("check_tcp");
117 SERVICE = strdup ("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 = strdup ("check_ftp");
126 SERVICE = strdup ("FTP");
127 SEND = NULL;
128 EXPECT = strdup ("220");
129 QUIT = strdup ("QUIT\r\n");
130 PROTOCOL = TCP_PROTOCOL;
131 PORT = 21;
132 }
133 else if (strstr (argv[0], "check_smtp")) {
134 progname = strdup ("check_smtp");
135 SERVICE = strdup ("SMTP");
136 SEND = NULL;
137 EXPECT = strdup ("220");
138 QUIT = strdup ("QUIT\r\n");
139 PROTOCOL = TCP_PROTOCOL;
140 PORT = 25;
141 }
142 else if (strstr (argv[0], "check_pop")) {
143 progname = strdup ("check_pop");
144 SERVICE = strdup ("POP");
145 SEND = NULL;
146 EXPECT = strdup ("+OK");
147 QUIT = strdup ("QUIT\r\n");
148 PROTOCOL = TCP_PROTOCOL;
149 PORT = 110;
150 }
151 else if (strstr (argv[0], "check_imap")) {
152 progname = strdup ("check_imap");
153 SERVICE = strdup ("IMAP");
154 SEND = NULL;
155 EXPECT = strdup ("* OK");
156 QUIT = strdup ("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 = strdup ("check_simap");
163 SERVICE = strdup ("SIMAP");
164 SEND=NULL;
165 EXPECT = strdup ("* OK");
166 QUIT = strdup ("a1 LOGOUT\r\n");
167 PROTOCOL=TCP_PROTOCOL;
168 use_ssl=TRUE;
169 PORT=993;
170 }
171 else if (strstr(argv[0],"check_spop")) {
172 progname = strdup ("check_spop");
173 SERVICE = strdup ("SPOP");
174 SEND=NULL;
175 EXPECT = strdup ("+OK");
176 QUIT = strdup ("QUIT\r\n");
177 PROTOCOL=TCP_PROTOCOL;
178 use_ssl=TRUE;
179 PORT=995;
180 }
181 #endif
182 else if (strstr (argv[0], "check_nntp")) {
183 progname = strdup ("check_nntp");
184 SERVICE = strdup ("NNTP");
185 SEND = NULL;
186 EXPECT = NULL;
187 server_expect = realloc (server_expect, ++server_expect_count);
188 asprintf (&server_expect[server_expect_count - 1], "200");
189 server_expect = realloc (server_expect, ++server_expect_count);
190 asprintf (&server_expect[server_expect_count - 1], "201");
191 asprintf (&QUIT, "QUIT\r\n");
192 PROTOCOL = TCP_PROTOCOL;
193 PORT = 119;
194 }
195 else {
196 usage ("ERROR: Generic check_tcp called with unknown service\n");
197 }
199 server_address = strdup ("127.0.0.1");
200 server_port = PORT;
201 server_send = SEND;
202 server_quit = QUIT;
204 if (process_arguments (argc, argv) == ERROR)
205 usage ("Could not parse arguments\n");
207 /* use default expect if none listed in process_arguments() */
208 if (EXPECT && server_expect_count == 0) {
209 server_expect = malloc (++server_expect_count);
210 server_expect[server_expect_count - 1] = EXPECT;
211 }
213 /* initialize alarm signal handling */
214 signal (SIGALRM, socket_timeout_alarm_handler);
216 /* set socket timeout */
217 alarm (socket_timeout);
219 /* try to connect to the host at the given port number */
220 gettimeofday (&tv, NULL);
221 #ifdef HAVE_SSL
222 if (use_ssl)
223 result = connect_SSL ();
224 else
225 #endif
226 {
227 if (PROTOCOL == UDP_PROTOCOL)
228 result = my_udp_connect (server_address, server_port, &sd);
229 else
230 /* default is TCP */
231 result = my_tcp_connect (server_address, server_port, &sd);
232 }
234 if (result == STATE_CRITICAL)
235 return STATE_CRITICAL;
237 if (server_send != NULL) { /* Something to send? */
238 asprintf (&server_send, "%s\r\n", server_send);
239 #ifdef HAVE_SSL
240 if (use_ssl)
241 SSL_write(ssl, server_send, strlen (server_send));
242 else
243 #endif
244 send (sd, server_send, strlen (server_send), 0);
245 }
247 if (delay > 0) {
248 tv.tv_sec += delay;
249 sleep (delay);
250 }
252 if (server_send || server_expect_count > 0) {
254 buffer = malloc (MAXBUF);
255 memset (buffer, '\0', MAXBUF);
256 /* watch for the expect string */
257 while ((i = my_recv ()) > 0) {
258 buffer[i] = '\0';
259 asprintf (&status, "%s%s", status, buffer);
260 if (buffer[i-2] == '\r' && buffer[i-1] == '\n')
261 break;
262 if (maxbytes>0 && strlen(status) >= (unsigned)maxbytes)
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, server_quit, strlen (server_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);
298 #ifdef HAVE_SSL
299 }
300 #endif
301 }
303 /* close the connection */
304 if (sd)
305 close (sd);
307 elapsed_time = delta_time (tv);
309 if (check_critical_time == TRUE && elapsed_time > critical_time)
310 result = STATE_CRITICAL;
311 else if (check_warning_time == TRUE && elapsed_time > warning_time)
312 result = STATE_WARNING;
314 /* reset the alarm */
315 alarm (0);
317 printf
318 ("%s %s%s - %.3f second response time on port %d",
319 SERVICE,
320 state_text (result),
321 (was_refused) ? " (refused)" : "",
322 elapsed_time, server_port);
324 if (status && strlen(status) > 0)
325 printf (" [%s]", status);
327 printf ("|time=%.3f\n", elapsed_time);
329 return result;
330 }
331 \f
335 /* process command-line arguments */
336 int
337 process_arguments (int argc, char **argv)
338 {
339 int c;
341 int option_index = 0;
342 static struct option long_options[] = {
343 {"hostname", required_argument, 0, 'H'},
344 {"critical-time", required_argument, 0, 'c'},
345 {"warning-time", required_argument, 0, 'w'},
346 {"critical-codes", required_argument, 0, 'C'},
347 {"warning-codes", required_argument, 0, 'W'},
348 {"timeout", required_argument, 0, 't'},
349 {"protocol", required_argument, 0, 'P'},
350 {"port", required_argument, 0, 'p'},
351 {"send", required_argument, 0, 's'},
352 {"expect", required_argument, 0, 'e'},
353 {"maxbytes", required_argument, 0, 'm'},
354 {"quit", required_argument, 0, 'q'},
355 {"delay", required_argument, 0, 'd'},
356 {"refuse", required_argument, 0, 'r'},
357 {"use-ipv4", no_argument, 0, '4'},
358 {"use-ipv6", no_argument, 0, '6'},
359 {"verbose", no_argument, 0, 'v'},
360 {"version", no_argument, 0, 'V'},
361 {"help", no_argument, 0, 'h'},
362 {0, 0, 0, 0}
363 };
365 if (argc < 2)
366 usage ("No arguments found\n");
368 /* backwards compatibility */
369 for (c = 1; c < argc; c++) {
370 if (strcmp ("-to", argv[c]) == 0)
371 strcpy (argv[c], "-t");
372 else if (strcmp ("-wt", argv[c]) == 0)
373 strcpy (argv[c], "-w");
374 else if (strcmp ("-ct", argv[c]) == 0)
375 strcpy (argv[c], "-c");
376 }
378 if (!is_option (argv[1])) {
379 server_address = argv[1];
380 argv[1] = argv[0];
381 argv = &argv[1];
382 argc--;
383 }
385 while (1) {
386 c = getopt_long (argc, argv, "+hVv46H:s:e:q:m:c:w:t:p:C:W:d:Sr:",
387 long_options, &option_index);
389 if (c == -1 || c == EOF || c == 1)
390 break;
392 switch (c) {
393 case '?': /* print short usage statement if args not parsable */
394 printf ("%s: Unknown argument: %s\n\n", progname, optarg);
395 print_usage ();
396 exit (STATE_UNKNOWN);
397 case 'h': /* help */
398 print_help ();
399 exit (STATE_OK);
400 case 'V': /* version */
401 print_revision (progname, "$Revision$");
402 exit (STATE_OK);
403 case 'v': /* verbose mode */
404 verbose = TRUE;
405 break;
406 case '4':
407 address_family = AF_INET;
408 break;
409 case '6':
410 #ifdef USE_IPV6
411 address_family = AF_INET6;
412 #else
413 usage ("IPv6 support not available\n");
414 #endif
415 break;
416 case 'H': /* hostname */
417 if (is_host (optarg) == FALSE)
418 usage2 ("invalid host name or address", optarg);
419 server_address = optarg;
420 break;
421 case 'c': /* critical */
422 if (!is_intnonneg (optarg))
423 usage ("Critical threshold must be a nonnegative integer\n");
424 critical_time = strtod (optarg, NULL);
425 check_critical_time = TRUE;
426 break;
427 case 'w': /* warning */
428 if (!is_intnonneg (optarg))
429 usage ("Warning threshold must be a nonnegative integer\n");
430 warning_time = strtod (optarg, NULL);
431 check_warning_time = TRUE;
432 break;
433 case 'C':
434 crit_codes = realloc (crit_codes, ++crit_codes_count);
435 crit_codes[crit_codes_count - 1] = optarg;
436 break;
437 case 'W':
438 warn_codes = realloc (warn_codes, ++warn_codes_count);
439 warn_codes[warn_codes_count - 1] = optarg;
440 break;
441 case 't': /* timeout */
442 if (!is_intpos (optarg))
443 usage ("Timeout interval must be a positive integer\n");
444 socket_timeout = atoi (optarg);
445 break;
446 case 'p': /* port */
447 if (!is_intpos (optarg))
448 usage ("Server port must be a positive integer\n");
449 server_port = atoi (optarg);
450 break;
451 case 's':
452 server_send = optarg;
453 break;
454 case 'e': /* expect string (may be repeated) */
455 EXPECT = NULL;
456 if (server_expect_count == 0)
457 server_expect = malloc (++server_expect_count);
458 else
459 server_expect = realloc (server_expect, ++server_expect_count);
460 server_expect[server_expect_count - 1] = optarg;
461 break;
462 case 'm':
463 if (!is_intpos (optarg))
464 usage ("Maxbytes must be a positive integer\n");
465 maxbytes = atoi (optarg);
466 case 'q':
467 server_quit = optarg;
468 break;
469 case 'r':
470 if (!strncmp(optarg,"ok",2))
471 econn_refuse_state = STATE_OK;
472 else if (!strncmp(optarg,"warn",4))
473 econn_refuse_state = STATE_WARNING;
474 else if (!strncmp(optarg,"crit",4))
475 econn_refuse_state = STATE_CRITICAL;
476 else
477 usage ("Refuse mut be one of ok, warn, crit\n");
478 break;
479 case 'd':
480 if (is_intpos (optarg))
481 delay = atoi (optarg);
482 else
483 usage ("Delay must be a positive integer\n");
484 break;
485 case 'S':
486 #ifndef HAVE_SSL
487 terminate (STATE_UNKNOWN,
488 "SSL support not available. Install OpenSSL and recompile.");
489 #endif
490 use_ssl = TRUE;
491 break;
492 }
493 }
495 if (server_address == NULL)
496 usage ("You must provide a server address\n");
498 return OK;
499 }
500 \f
504 void
505 print_help (void)
506 {
507 print_revision (progname, revision);
509 printf ("Copyright (c) %s %s\n\t<%s>\n\n", copyright, authors, email);
511 printf (_("\
512 This plugin tests %s connections with the specified host.\n"), SERVICE);
514 print_usage ();
516 printf ("\nOptions:\n");
518 printf (_("\
519 -H, --hostname=ADDRESS\n\
520 Host name argument for servers using host headers (use numeric\n\
521 address if possible to bypass DNS lookup).\n\
522 -p, --port=INTEGER\n\
523 Port number\n\
524 -4, --use-ipv4\n\
525 Use IPv4 connection\n\
526 -6, --use-ipv6\n\
527 Use IPv6 connection\n"));
529 printf (_("\
530 -s, --send=STRING\n\
531 String to send to the server\n\
532 -e, --expect=STRING\n\
533 String to expect in server response\n\
534 -q, --quit=STRING\n\
535 String to send server to initiate a clean close of the connection\n"));
537 printf (_("\
538 -r, --refuse=ok|warn|crit\n\
539 Accept tcp refusals with states ok, warn, crit (default: crit)\n\
540 -m, --maxbytes=INTEGER\n\
541 Close connection once more than this number of bytes are received\n\
542 -d, --delay=INTEGER\n\
543 Seconds to wait between sending string and polling for response\n\
544 -w, --warning=DOUBLE\n\
545 Response time to result in warning status (seconds)\n\
546 -c, --critical=DOUBLE\n\
547 Response time to result in critical status (seconds)\n"));
549 printf (_("\
550 -t, --timeout=INTEGER\n\
551 Seconds before connection times out (default: %d)\n\
552 -v, --verbose\n\
553 Show details for command-line debugging (Nagios may truncate output)\n\
554 -h, --help\n\
555 Print detailed help screen\n\
556 -V, --version\n\
557 Print version information\n\n"),
558 DEFAULT_SOCKET_TIMEOUT);
560 support ();
561 }
563 void
564 print_usage (void)
565 {
566 printf ("Usage: %s %s\n", progname, _("\
567 -H host -p port [-w warn_time] [-c crit_time] [-s send_string]\n\
568 [-e expect_string] [-q quit_string] [-m maxbytes] [-d delay]\n\
569 [-t to_sec] [-r refuse_state] [-v] [-4|-6]\n"));
570 printf (" %s (-h|--help)\n", progname);
571 printf (" %s (-V|--version)\n", progname);
572 }
573 \f
577 #ifdef HAVE_SSL
578 int
579 connect_SSL (void)
580 {
581 SSL_METHOD *meth;
583 /* Initialize SSL context */
584 SSLeay_add_ssl_algorithms ();
585 meth = SSLv2_client_method ();
586 SSL_load_error_strings ();
587 if ((ctx = SSL_CTX_new (meth)) == NULL)
588 {
589 printf ("ERROR: Cannot create SSL context.\n");
590 return STATE_CRITICAL;
591 }
593 /* Initialize alarm signal handling */
594 signal (SIGALRM, socket_timeout_alarm_handler);
596 /* Set socket timeout */
597 alarm (socket_timeout);
599 /* Save start time */
600 time (&start_time);
602 /* Make TCP connection */
603 if (my_tcp_connect (server_address, server_port, &sd) == STATE_OK && was_refused == FALSE)
604 {
605 /* Do the SSL handshake */
606 if ((ssl = SSL_new (ctx)) != NULL)
607 {
608 SSL_set_fd (ssl, sd);
609 if (SSL_connect (ssl) != -1)
610 return OK;
611 ERR_print_errors_fp (stderr);
612 }
613 else
614 {
615 printf ("ERROR: Cannot initiate SSL handshake.\n");
616 }
617 SSL_free (ssl);
618 }
620 SSL_CTX_free (ctx);
621 close (sd);
623 return STATE_CRITICAL;
624 }
625 #endif
629 int
630 my_recv (void)
631 {
632 int i;
634 #ifdef HAVE_SSL
635 if (use_ssl) {
636 i = SSL_read (ssl, buffer, MAXBUF - 1);
637 }
638 else {
639 #endif
640 i = read (sd, buffer, MAXBUF - 1);
641 #ifdef HAVE_SSL
642 }
643 #endif
645 return i;
646 }