1 /****************************************************************************
2 *
3 * Program: HTTP plugin for Nagios
4 * License: GPL
5 *
6 * License Information:
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
21 *
22 * $Id$
23 *
24 *****************************************************************************/
26 #define PROGNAME "check_http"
27 #define REVISION "$Revision$"
28 #define COPYRIGHT "1999-2001"
29 #define AUTHORS "Ethan Galstad/Karl DeBisschop"
30 #define EMAIL "kdebisschop@users.sourceforge.net"
32 #include "config.h"
33 #include "common.h"
34 #include "version.h"
35 #include "netutils.h"
36 #include "utils.h"
38 #define SUMMARY "\
39 This plugin tests the HTTP service on the specified host. It can test\n\
40 normal (http) and secure (https) servers, follow redirects, search for\n\
41 strings and regular expressions, check connection times, and report on\n\
42 certificate expiration times.\n"
44 #define OPTIONS "\
45 \(-H <vhost> | -I <IP-address>) [-u <uri>] [-p <port>]\n\
46 [-w <warn time>] [-c <critical time>] [-t <timeout>] [-L]\n\
47 [-a auth] [-f <ok | warn | critcal | follow>] [-e <expect>]\n\
48 [-s string] [-r <regex> | -R <case-insensitive regex>]\n\
49 [-P string]"
51 #define LONGOPTIONS "\
52 -H, --hostname=ADDRESS\n\
53 Host name argument for servers using host headers (virtual host)\n\
54 -I, --IP-address=ADDRESS\n\
55 IP address or name (use numeric address if possible to bypass DNS lookup).\n\
56 -e, --expect=STRING\n\
57 String to expect in first (status) line of server response (default: %s)\n\
58 If specified skips all other status line logic (ex: 3xx, 4xx, 5xx processing)\n\
59 -s, --string=STRING\n\
60 String to expect in the content\n\
61 -u, --url=PATH\n\
62 URL to GET or POST (default: /)\n\
63 -p, --port=INTEGER\n\
64 Port number (default: %d)\n\
65 -P, --post=STRING\n\
66 URL encoded http POST data\n\
67 -w, --warning=INTEGER\n\
68 Response time to result in warning status (seconds)\n\
69 -c, --critical=INTEGER\n\
70 Response time to result in critical status (seconds)\n\
71 -t, --timeout=INTEGER\n\
72 Seconds before connection times out (default: %d)\n\
73 -a, --authorization=AUTH_PAIR\n\
74 Username:password on sites with basic authentication\n\
75 -L, --link=URL\n\
76 Wrap output in HTML link (obsoleted by urlize)\n\
77 -f, --onredirect=<ok|warning|critical|follow>\n\
78 How to handle redirected pages\n%s\
79 -v, --verbose\n\
80 Show details for command-line debugging (do not use with nagios server)\n\
81 -h, --help\n\
82 Print detailed help screen\n\
83 -V, --version\n\
84 Print version information\n"
86 #ifdef HAVE_SSL
87 #define SSLOPTIONS "\
88 -S, --ssl\n\
89 Connect via SSL\n\
90 -C, --certificate=INTEGER\n\
91 Minimum number of days a certificate has to be valid.\n\
92 (when this option is used the url is not checked.)\n"
93 #else
94 #define SSLOPTIONS ""
95 #endif
97 #define DESCRIPTION "\
98 This plugin will attempt to open an HTTP connection with the host. Successul\n\
99 connects return STATE_OK, refusals and timeouts return STATE_CRITICAL, other\n\
100 errors return STATE_UNKNOWN. Successful connects, but incorrect reponse\n\
101 messages from the host result in STATE_WARNING return values. If you are\n\
102 checking a virtual server that uses \"host headers\" you must supply the FQDN\n\
103 \(fully qualified domain name) as the [host_name] argument.\n"
105 #define SSLDESCRIPTION "\
106 This plugin can also check whether an SSL enabled web server is able to\n\
107 serve content (optionally within a specified time) or whether the X509 \n\
108 certificate is still valid for the specified number of days.\n\n\
109 CHECK CONTENT: check_http -w 5 -c 10 --ssl www.verisign.com\n\n\
110 When the 'www.verisign.com' server returns its content within 5 seconds, a\n\
111 STATE_OK will be returned. When the server returns its content but exceeds\n\
112 the 5-second threshold, a STATE_WARNING will be returned. When an error occurs,\n\
113 a STATE_CRITICAL will be returned.\n\n\
114 CHECK CERTIFICATE: check_http www.verisign.com -C 14\n\n\
115 When the certificate of 'www.verisign.com' is valid for more than 14 days, a\n\
116 STATE_OK is returned. When the certificate is still valid, but for less than\n\
117 14 days, a STATE_WARNING is returned. A STATE_CRITICAL will be returned when\n\
118 the certificate is expired.\n"
120 #ifdef HAVE_SSL_H
121 #include <rsa.h>
122 #include <crypto.h>
123 #include <x509.h>
124 #include <pem.h>
125 #include <ssl.h>
126 #include <err.h>
127 #include <rand.h>
128 #endif
130 #ifdef HAVE_OPENSSL_SSL_H
131 #include <openssl/rsa.h>
132 #include <openssl/crypto.h>
133 #include <openssl/x509.h>
134 #include <openssl/pem.h>
135 #include <openssl/ssl.h>
136 #include <openssl/err.h>
137 #include <openssl/rand.h>
138 #endif
140 #ifdef HAVE_SSL
141 int check_cert = FALSE;
142 int days_till_exp;
143 unsigned char *randbuff;
144 SSL_CTX *ctx;
145 SSL *ssl;
146 X509 *server_cert;
147 int connect_SSL (void);
148 int check_certificate (X509 **);
149 #endif
151 #ifdef HAVE_REGEX_H
152 #define REGS 2
153 #define MAX_RE_SIZE 256
154 #include <regex.h>
155 regex_t preg;
156 regmatch_t pmatch[REGS];
157 char regexp[MAX_RE_SIZE];
158 char errbuf[MAX_INPUT_BUFFER];
159 int cflags = REG_NOSUB | REG_EXTENDED | REG_NEWLINE;
160 int errcode;
161 #endif
163 #define server_type_check(server_type) \
164 (strcmp (server_type, "https") ? FALSE : TRUE)
166 #define server_port_check(use_ssl) (use_ssl ? HTTPS_PORT : HTTP_PORT)
168 #define MAX_IPV4_HOSTLENGTH 64
169 #define HDR_LOCATION "%*[Ll]%*[Oo]%*[Cc]%*[Aa]%*[Tt]%*[Ii]%*[Oo]%*[Nn]: "
170 #define URI_HTTP "%[HTPShtps]://"
171 #define URI_HOST "%[a-zA-Z0-9.-]"
172 #define URI_PORT ":%[0-9]"
173 #define URI_PATH "%[/a-zA-Z0-9._-=@,]"
175 #define HTTP_PORT 80
176 #define HTTPS_PORT 443
177 #define HTTP_EXPECT "HTTP/1."
178 #define HTTP_URL "/"
180 char timestamp[17] = "";
181 int specify_port = FALSE;
182 int server_port = HTTP_PORT;
183 char server_port_text[6] = "";
184 char server_type[6] = "http";
185 /*@null@*/ char *server_address = NULL;
186 /*@null@*/ char *host_name = NULL;
187 /*@null@*/ char *server_url = NULL;
188 int server_url_length = 0;
189 int server_expect_yn = 0;
190 char server_expect[MAX_INPUT_BUFFER] = HTTP_EXPECT;
191 char string_expect[MAX_INPUT_BUFFER] = "";
192 int warning_time = 0;
193 int check_warning_time = FALSE;
194 int critical_time = 0;
195 int check_critical_time = FALSE;
196 char user_auth[MAX_INPUT_BUFFER] = "";
197 int display_html = FALSE;
198 int onredirect = STATE_OK;
199 int use_ssl = FALSE;
200 int verbose = FALSE;
201 int sd;
202 /*@null@*/ char *http_method = NULL;
203 /*@null@*/ char *http_post_data = NULL;
204 char buffer[MAX_INPUT_BUFFER];
206 void print_usage (void);
207 void print_help (void);
208 int process_arguments (int, char **);
209 int call_getopt (int, char **);
210 static char *base64 (char *bin, int len);
211 int check_http (void);
212 int my_recv (void);
213 int my_close (void);
215 int
216 main (int argc, char **argv)
217 {
218 int result = STATE_UNKNOWN;
220 if (process_arguments (argc, argv) == ERROR)
221 usage ("check_http: could not parse arguments\n");
223 if (strstr (timestamp, ":")) {
224 if (strstr (server_url, "?"))
225 server_url = ssprintf (server_url, "%s&%s", server_url, timestamp);
226 else
227 server_url = ssprintf (server_url, "%s?%s", server_url, timestamp);
228 }
230 if (display_html == TRUE)
231 printf ("<A HREF=\"http://%s:%d%s\" target=\"_blank\">",
232 host_name, server_port, server_url);
234 /* initialize alarm signal handling, set socket timeout, start timer */
235 (void) signal (SIGALRM, socket_timeout_alarm_handler);
236 (void) alarm (socket_timeout);
237 (void) time (&start_time);
239 #ifdef HAVE_SSL
240 if (use_ssl && check_cert == TRUE) {
241 if (connect_SSL () != OK)
242 terminate (STATE_CRITICAL,
243 "HTTP CRITICAL - Could not make SSL connection\n");
244 if ((server_cert = SSL_get_peer_certificate (ssl)) != NULL) {
245 result = check_certificate (&server_cert);
246 X509_free (server_cert);
247 }
248 else {
249 printf ("ERROR: Cannot retrieve server certificate.\n");
250 result = STATE_CRITICAL;
251 }
252 SSL_shutdown (ssl);
253 SSL_free (ssl);
254 SSL_CTX_free (ctx);
255 close (sd);
256 }
257 else {
258 result = check_http ();
259 }
260 #else
261 result = check_http ();
262 #endif
263 return result;
264 }
265 \f
268 /* process command-line arguments */
269 int
270 process_arguments (int argc, char **argv)
271 {
272 int c, i = 1;
273 char optchars[MAX_INPUT_BUFFER];
275 #ifdef HAVE_GETOPT_H
276 int option_index = 0;
277 static struct option long_options[] = {
278 STD_OPTS_LONG,
279 {"link", no_argument, 0, 'L'},
280 {"nohtml", no_argument, 0, 'n'},
281 {"ssl", no_argument, 0, 'S'},
282 {"verbose", no_argument, 0, 'v'},
283 {"post", required_argument, 0, 'P'},
284 {"IP-address", required_argument, 0, 'I'},
285 {"string", required_argument, 0, 's'},
286 {"regex", required_argument, 0, 'r'},
287 {"ereg", required_argument, 0, 'r'},
288 {"eregi", required_argument, 0, 'R'},
289 {"onredirect", required_argument, 0, 'f'},
290 {"certificate", required_argument, 0, 'C'},
291 {0, 0, 0, 0}
292 };
293 #endif
295 if (argc < 2)
296 return ERROR;
298 for (c = 1; c < argc; c++) {
299 if (strcmp ("-to", argv[c]) == 0)
300 strcpy (argv[c], "-t");
301 if (strcmp ("-hn", argv[c]) == 0)
302 strcpy (argv[c], "-H");
303 if (strcmp ("-wt", argv[c]) == 0)
304 strcpy (argv[c], "-w");
305 if (strcmp ("-ct", argv[c]) == 0)
306 strcpy (argv[c], "-c");
307 if (strcmp ("-nohtml", argv[c]) == 0)
308 strcpy (argv[c], "-n");
309 }
311 snprintf (optchars, MAX_INPUT_BUFFER, "%s%s", STD_OPTS,
312 "P:I:a:e:p:s:R:r:u:f:C:nLS");
314 while (1) {
315 #ifdef HAVE_GETOPT_H
316 c = getopt_long (argc, argv, optchars, long_options, &option_index);
317 #else
318 c = getopt (argc, argv, optchars);
319 #endif
320 if (c == -1 || c == EOF)
321 break;
323 switch (c) {
324 case '?': /* usage */
325 usage2 ("unknown argument", optarg);
326 break;
327 case 'h': /* help */
328 print_help ();
329 exit (STATE_OK);
330 break;
331 case 'V': /* version */
332 print_revision (PROGNAME, REVISION);
333 exit (STATE_OK);
334 break;
335 case 't': /* timeout period */
336 if (!is_intnonneg (optarg))
337 usage2 ("timeout interval must be a non-negative integer", optarg);
338 socket_timeout = atoi (optarg);
339 break;
340 case 'c': /* critical time threshold */
341 if (!is_intnonneg (optarg))
342 usage2 ("invalid critical threshold", optarg);
343 critical_time = atoi (optarg);
344 check_critical_time = TRUE;
345 break;
346 case 'w': /* warning time threshold */
347 if (!is_intnonneg (optarg))
348 usage2 ("invalid warning threshold", optarg);
349 warning_time = atoi (optarg);
350 check_warning_time = TRUE;
351 break;
352 case 'L': /* show html link */
353 display_html = TRUE;
354 break;
355 case 'n': /* do not show html link */
356 display_html = FALSE;
357 break;
358 case 'S': /* use SSL */
359 #ifndef HAVE_SSL
360 usage ("check_http: invalid option - SSL is not available\n");
361 #endif
362 use_ssl = TRUE;
363 if (specify_port == FALSE)
364 server_port = HTTPS_PORT;
365 break;
366 case 'C': /* warning time threshold */
367 #ifdef HAVE_SSL
368 if (!is_intnonneg (optarg))
369 usage2 ("invalid certificate expiration period", optarg);
370 days_till_exp = atoi (optarg);
371 check_cert = TRUE;
372 #else
373 usage ("check_http: invalid option - SSL is not available\n");
374 #endif
375 break;
376 case 'f': /* onredirect */
377 if (!strcmp (optarg, "follow"))
378 onredirect = STATE_DEPENDENT;
379 if (!strcmp (optarg, "unknown"))
380 onredirect = STATE_UNKNOWN;
381 if (!strcmp (optarg, "ok"))
382 onredirect = STATE_OK;
383 if (!strcmp (optarg, "warning"))
384 onredirect = STATE_WARNING;
385 if (!strcmp (optarg, "critical"))
386 onredirect = STATE_CRITICAL;
387 if (verbose)
388 printf("option f:%d \n", onredirect);
389 break;
390 /* Note: H, I, and u must be malloc'd or will fail on redirects */
391 case 'H': /* Host Name (virtual host) */
392 host_name = strscpy (host_name, optarg);
393 break;
394 case 'I': /* Server IP-address */
395 server_address = strscpy (server_address, optarg);
396 break;
397 case 'u': /* Host or server */
398 server_url = strscpy (server_url, optarg);
399 server_url_length = strlen (optarg);
400 break;
401 case 'p': /* Host or server */
402 if (!is_intnonneg (optarg))
403 usage2 ("invalid port number", optarg);
404 server_port = atoi (optarg);
405 specify_port = TRUE;
406 break;
407 case 'a': /* authorization info */
408 strncpy (user_auth, optarg, MAX_INPUT_BUFFER - 1);
409 user_auth[MAX_INPUT_BUFFER - 1] = 0;
410 break;
411 case 'P': /* HTTP POST data in URL encoded format */
412 http_method = strscpy (http_method, "POST");
413 http_post_data = strscpy (http_post_data, optarg);
414 break;
415 case 's': /* string or substring */
416 strncpy (string_expect, optarg, MAX_INPUT_BUFFER - 1);
417 string_expect[MAX_INPUT_BUFFER - 1] = 0;
418 break;
419 case 'e': /* string or substring */
420 strncpy (server_expect, optarg, MAX_INPUT_BUFFER - 1);
421 server_expect[MAX_INPUT_BUFFER - 1] = 0;
422 server_expect_yn = 1;
423 break;
424 case 'R': /* regex */
425 #ifdef HAVE_REGEX_H
426 cflags = REG_ICASE;
427 #else
428 usage ("check_http: call for regex which was not a compiled option\n");
429 #endif
430 case 'r': /* regex */
431 #ifdef HAVE_REGEX_H
432 cflags |= REG_EXTENDED | REG_NOSUB | REG_NEWLINE;
433 strncpy (regexp, optarg, MAX_RE_SIZE - 1);
434 regexp[MAX_RE_SIZE - 1] = 0;
435 errcode = regcomp (&preg, regexp, cflags);
436 if (errcode != 0) {
437 (void) regerror (errcode, &preg, errbuf, MAX_INPUT_BUFFER);
438 printf ("Could Not Compile Regular Expression: %s", errbuf);
439 return ERROR;
440 }
441 #else
442 usage ("check_http: call for regex which was not a compiled option\n");
443 #endif
444 break;
445 case 'v': /* verbose */
446 verbose = TRUE;
447 break;
448 }
449 }
451 c = optind;
453 if (server_address == NULL && host_name == NULL) {
454 server_address = strscpy (NULL, argv[c]);
455 host_name = strscpy (NULL, argv[c++]);
456 }
458 if (server_address == NULL && host_name == NULL)
459 usage ("check_http: you must specify a host name\n");
461 if (server_address == NULL)
462 server_address = strscpy (NULL, host_name);
464 if (host_name == NULL)
465 host_name = strscpy (NULL, server_address);
467 if (http_method == NULL)
468 http_method = strscpy (http_method, "GET");
470 if (server_url == NULL) {
471 server_url = strscpy (NULL, "/");
472 server_url_length = strlen(HTTP_URL);
473 }
475 return TRUE;
476 }
477 \f
480 /* written by lauri alanko */
481 static char *
482 base64 (char *bin, int len)
483 {
485 char *buf = (char *) malloc ((len + 2) / 3 * 4 + 1);
486 int i = 0, j = 0;
488 char BASE64_END = '=';
489 char base64_table[64] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
491 while (j < len - 2) {
492 buf[i++] = base64_table[bin[j] >> 2];
493 buf[i++] = base64_table[((bin[j] & 3) << 4) | (bin[j + 1] >> 4)];
494 buf[i++] = base64_table[((bin[j + 1] & 15) << 2) | (bin[j + 2] >> 6)];
495 buf[i++] = base64_table[bin[j + 2] & 63];
496 j += 3;
497 }
499 switch (len - j) {
500 case 1:
501 buf[i++] = base64_table[bin[j] >> 2];
502 buf[i++] = base64_table[(bin[j] & 3) << 4];
503 buf[i++] = BASE64_END;
504 buf[i++] = BASE64_END;
505 break;
506 case 2:
507 buf[i++] = base64_table[bin[j] >> 2];
508 buf[i++] = base64_table[((bin[j] & 3) << 4) | (bin[j + 1] >> 4)];
509 buf[i++] = base64_table[(bin[j + 1] & 15) << 2];
510 buf[i++] = BASE64_END;
511 break;
512 case 0:
513 break;
514 }
516 buf[i] = '\0';
517 return buf;
518 }
519 \f
522 int
523 check_http (void)
524 {
525 char *msg = NULL;
526 char *status_line = NULL;
527 char *header = NULL;
528 char *page = NULL;
529 char *auth = NULL;
530 int i = 0;
531 size_t pagesize = 0;
532 char *full_page = NULL;
533 char *buf = NULL;
534 char *pos = NULL;
535 char *x = NULL;
536 char *orig_url = NULL;
538 /* try to connect to the host at the given port number */
539 #ifdef HAVE_SSL
540 if (use_ssl == TRUE) {
542 if (connect_SSL () != OK) {
543 msg = ssprintf (msg, "Unable to open TCP socket");
544 terminate (STATE_CRITICAL, msg);
545 }
547 if ((server_cert = SSL_get_peer_certificate (ssl)) != NULL) {
548 X509_free (server_cert);
549 }
550 else {
551 printf ("ERROR: Cannot retrieve server certificate.\n");
552 return STATE_CRITICAL;
553 }
555 buf = ssprintf (buf, "%s %s HTTP/1.0\r\n", http_method, server_url);
556 if (SSL_write (ssl, buf, strlen (buf)) == -1) {
557 ERR_print_errors_fp (stderr);
558 return STATE_CRITICAL;
559 }
561 /* optionally send the host header info (not clear if it's usable) */
562 if (strcmp (host_name, "")) {
563 buf = ssprintf (buf, "Host: %s\r\n", host_name);
564 if (SSL_write (ssl, buf, strlen (buf)) == -1) {
565 ERR_print_errors_fp (stderr);
566 return STATE_CRITICAL;
567 }
568 }
570 /* send user agent */
571 buf = ssprintf (buf, "User-Agent: check_http/%s (nagios-plugins %s)\r\n",
572 clean_revstring (REVISION), PACKAGE_VERSION);
573 if (SSL_write (ssl, buf, strlen (buf)) == -1) {
574 ERR_print_errors_fp (stderr);
575 return STATE_CRITICAL;
576 }
578 /* optionally send the authentication info */
579 if (strcmp (user_auth, "")) {
580 auth = base64 (user_auth, strlen (user_auth));
581 buf = ssprintf (buf, "Authorization: Basic %s\r\n", auth);
582 if (SSL_write (ssl, buf, strlen (buf)) == -1) {
583 ERR_print_errors_fp (stderr);
584 return STATE_CRITICAL;
585 }
586 }
588 /* optionally send http POST data */
589 if (http_post_data) {
590 buf = ssprintf (buf, "Content-Type: application/x-www-form-urlencoded\r\n");
591 if (SSL_write (ssl, buf, strlen (buf)) == -1) {
592 ERR_print_errors_fp (stderr);
593 return STATE_CRITICAL;
594 }
595 buf = ssprintf (buf, "Content-Length: %i\r\n\r\n", strlen (http_post_data));
596 if (SSL_write (ssl, buf, strlen (buf)) == -1) {
597 ERR_print_errors_fp (stderr);
598 return STATE_CRITICAL;
599 }
600 http_post_data = strscat (http_post_data, "\r\n");
601 if (SSL_write (ssl, http_post_data, strlen (http_post_data)) == -1) {
602 ERR_print_errors_fp (stderr);
603 return STATE_CRITICAL;
604 }
605 }
607 /* send a newline so the server knows we're done with the request */
608 buf = ssprintf (buf, "\r\n\r\n");
609 if (SSL_write (ssl, buf, strlen (buf)) == -1) {
610 ERR_print_errors_fp (stderr);
611 return STATE_CRITICAL;
612 }
614 }
615 else {
616 #endif
617 if (my_tcp_connect (server_address, server_port, &sd) != STATE_OK) {
618 msg = ssprintf (msg, "Unable to open TCP socket");
619 terminate (STATE_CRITICAL, msg);
620 }
621 buf = ssprintf (buf, "%s %s HTTP/1.0\r\n", http_method, server_url);
622 send (sd, buf, strlen (buf), 0);
626 /* optionally send the host header info */
627 if (strcmp (host_name, "")) {
628 buf = ssprintf (buf, "Host: %s\r\n", host_name);
629 send (sd, buf, strlen (buf), 0);
630 }
632 /* send user agent */
633 buf = ssprintf (buf,
634 "User-Agent: check_http/%s (nagios-plugins %s)\r\n",
635 clean_revstring (REVISION), PACKAGE_VERSION);
636 send (sd, buf, strlen (buf), 0);
638 /* optionally send the authentication info */
639 if (strcmp (user_auth, "")) {
640 auth = base64 (user_auth, strlen (user_auth));
641 buf = ssprintf (buf, "Authorization: Basic %s\r\n", auth);
642 send (sd, buf, strlen (buf), 0);
643 }
645 /* optionally send http POST data */
646 /* written by Chris Henesy <lurker@shadowtech.org> */
647 if (http_post_data) {
648 buf = ssprintf (buf, "Content-Type: application/x-www-form-urlencoded\r\n");
649 send (sd, buf, strlen (buf), 0);
650 buf = ssprintf (buf, "Content-Length: %i\r\n\r\n", strlen (http_post_data));
651 send (sd, buf, strlen (buf), 0);
652 http_post_data = strscat (http_post_data, "\r\n");
653 send (sd, http_post_data, strlen (http_post_data), 0);
654 }
656 /* send a newline so the server knows we're done with the request */
657 buf = ssprintf (buf, "\r\n\r\n");
658 send (sd, buf, strlen (buf), 0);
659 #ifdef HAVE_SSL
660 }
661 #endif
663 /* fetch the page */
664 pagesize = (size_t) 0;
665 while ((i = my_recv ()) > 0) {
666 buffer[i] = "\0";
667 full_page = strscat (full_page, buffer);
668 pagesize += i;
669 }
671 if (i < 0)
672 terminate (STATE_CRITICAL, "Error in recv()");
674 /* return a CRITICAL status if we couldn't read any data */
675 if (pagesize == (size_t) 0)
676 terminate (STATE_CRITICAL, "No data received %s", timestamp);
678 /* close the connection */
679 my_close ();
681 /* reset the alarm */
682 alarm (0);
684 /* leave full_page untouched so we can free it later */
685 page = full_page;
687 if (verbose)
688 printf ("Page is %d characters\n", pagesize);
690 /* find status line and null-terminate it */
691 status_line = page;
692 page += (size_t) strcspn (page, "\r\n");
693 pos = page;
694 page += (size_t) strspn (page, "\r\n");
695 status_line[pos - status_line] = 0;
696 strip (status_line);
697 if (verbose)
698 printf ("STATUS: %s\n", status_line);
700 /* find header info and null terminate it */
701 header = page;
702 while (strcspn (page, "\r\n") > 0) {
703 page += (size_t) strcspn (page, "\r\n");
704 pos = page;
705 if ((strspn (page, "\r") == 1 && strspn (page, "\r\n") >= 2) ||
706 (strspn (page, "\n") == 1 && strspn (page, "\r\n") >= 2))
707 page += (size_t) 2;
708 else
709 page += (size_t) 1;
710 }
711 page += (size_t) strspn (page, "\r\n");
712 header[pos - header] = 0;
713 if (verbose)
714 printf ("**** HEADER ****\n%s\n**** CONTENT ****\n%s\n", header, page);
716 /* make sure the status line matches the response we are looking for */
717 if (!strstr (status_line, server_expect)) {
718 if (server_port == HTTP_PORT)
719 msg = ssprintf (msg, "Invalid HTTP response received from host\n");
720 else
721 msg = ssprintf (msg,
722 "Invalid HTTP response received from host on port %d\n",
723 server_port);
724 terminate (STATE_CRITICAL, msg);
725 }
728 /* Exit here if server_expect was set by user and not default */
729 if ( server_expect_yn ) {
730 msg = ssprintf (msg, "HTTP OK: Status line output matched \"%s\"\n",
731 server_expect);
732 if (verbose)
733 printf ("%s\n",msg);
735 }
736 else {
739 /* check the return code */
740 /* server errors result in a critical state */
741 if (strstr (status_line, "500") ||
742 strstr (status_line, "501") ||
743 strstr (status_line, "502") ||
744 strstr (status_line, "503")) {
745 msg = ssprintf (msg, "HTTP CRITICAL: %s\n", status_line);
746 terminate (STATE_CRITICAL, msg);
747 }
749 /* client errors result in a warning state */
750 if (strstr (status_line, "400") ||
751 strstr (status_line, "401") ||
752 strstr (status_line, "402") ||
753 strstr (status_line, "403") ||
754 strstr (status_line, "404")) {
755 msg = ssprintf (msg, "HTTP WARNING: %s\n", status_line);
756 terminate (STATE_WARNING, msg);
757 }
759 /* check redirected page if specified */
760 if (strstr (status_line, "300") ||
761 strstr (status_line, "301") ||
762 strstr (status_line, "302") ||
763 strstr (status_line, "303") ||
764 strstr (status_line, "304")) {
765 if (onredirect == STATE_DEPENDENT) {
767 orig_url = strscpy(NULL, server_url);
768 pos = header;
769 while (pos) {
770 server_address = realloc (server_address, MAX_IPV4_HOSTLENGTH);
771 if (server_address == NULL)
772 terminate (STATE_UNKNOWN,
773 "HTTP UNKNOWN: could not allocate server_address");
774 if (strcspn (pos, "\r\n") > server_url_length) {
775 server_url = realloc (server_url, strcspn (pos, "\r\n"));
776 if (server_url == NULL)
777 terminate (STATE_UNKNOWN,
778 "HTTP UNKNOWN: could not allocate server_url");
779 server_url_length = strcspn (pos, "\r\n");
780 }
781 if (sscanf (pos, HDR_LOCATION URI_HTTP URI_HOST URI_PORT URI_PATH, server_type, server_address, server_port_text, server_url) == 4) {
782 host_name = strscpy (host_name, server_address);
783 use_ssl = server_type_check (server_type);
784 server_port = atoi (server_port_text);
785 check_http ();
786 }
787 else if (sscanf (pos, HDR_LOCATION URI_HTTP URI_HOST URI_PATH, server_type, server_address, server_url) == 3 ) {
788 host_name = strscpy (host_name, server_address);
789 use_ssl = server_type_check (server_type);
790 server_port = server_port_check (use_ssl);
791 check_http ();
792 }
793 else if (sscanf (pos, HDR_LOCATION URI_HTTP URI_HOST URI_PORT, server_type, server_address, server_port_text) == 3) {
794 host_name = strscpy (host_name, server_address);
795 strcpy (server_url, "/");
796 use_ssl = server_type_check (server_type);
797 server_port = atoi (server_port_text);
798 check_http ();
799 }
800 else if (sscanf (pos, HDR_LOCATION URI_HTTP URI_HOST, server_type, server_address) == 2) {
801 host_name = strscpy (host_name, server_address);
802 strcpy (server_url, "/");
803 use_ssl = server_type_check (server_type);
804 server_port = server_port_check (use_ssl);
805 check_http ();
806 }
807 else if (sscanf (pos, HDR_LOCATION URI_PATH, server_url) == 1) {
808 if ((server_url[0] != '/') && (x = strrchr(orig_url, '/'))) {
809 *x = '\0';
810 server_url = ssprintf (server_url, "%s/%s", orig_url, server_url);
811 }
812 check_http ();
813 }
814 pos += (size_t) strcspn (pos, "\r\n");
815 pos += (size_t) strspn (pos, "\r\n");
816 } /* end while (pos) */
817 printf ("HTTP UNKNOWN: Could not find redirect location - %s%s",
818 status_line, (display_html ? "</A>" : ""));
819 exit (STATE_UNKNOWN);
820 } /* end if (onredirect == STATE_DEPENDENT) */
822 else if (onredirect == STATE_UNKNOWN)
823 printf ("HTTP UNKNOWN");
824 else if (onredirect == STATE_OK)
825 printf ("HTTP ok");
826 else if (onredirect == STATE_WARNING)
827 printf ("HTTP WARNING");
828 else if (onredirect == STATE_CRITICAL)
829 printf ("HTTP CRITICAL");
830 time (&end_time);
831 msg = ssprintf (msg, ": %s - %d second response time %s%s|time=%d\n",
832 status_line, (int) (end_time - start_time), timestamp,
833 (display_html ? "</A>" : ""), (int) (end_time - start_time));
834 terminate (onredirect, msg);
835 } /* end if (strstr (status_line, "30[0-4]") */
838 } /* end else (server_expect_yn) */
841 /* check elapsed time */
842 time (&end_time);
843 msg = ssprintf (msg, "HTTP problem: %s - %d second response time %s%s|time=%d\n",
844 status_line, (int) (end_time - start_time), timestamp,
845 (display_html ? "</A>" : ""), (int) (end_time - start_time));
846 if (check_critical_time == TRUE && (end_time - start_time) > critical_time)
847 terminate (STATE_CRITICAL, msg);
848 if (check_warning_time == TRUE && (end_time - start_time) > warning_time)
849 terminate (STATE_WARNING, msg);
851 /* Page and Header content checks go here */
852 /* these checks should be last */
854 if (strlen (string_expect)) {
855 if (strstr (page, string_expect)) {
856 printf ("HTTP ok: %s - %d second response time %s%s|time=%d\n",
857 status_line, (int) (end_time - start_time),
858 timestamp, (display_html ? "</A>" : ""), (int) (end_time - start_time));
859 exit (STATE_OK);
860 }
861 else {
862 printf ("HTTP CRITICAL: string not found%s|time=%d\n",
863 (display_html ? "</A>" : ""), (int) (end_time - start_time));
864 exit (STATE_CRITICAL);
865 }
866 }
867 #ifdef HAVE_REGEX_H
868 if (strlen (regexp)) {
869 errcode = regexec (&preg, page, REGS, pmatch, 0);
870 if (errcode == 0) {
871 printf ("HTTP ok: %s - %d second response time %s%s|time=%d\n",
872 status_line, (int) (end_time - start_time),
873 timestamp, (display_html ? "</A>" : ""), (int) (end_time - start_time));
874 exit (STATE_OK);
875 }
876 else {
877 if (errcode == REG_NOMATCH) {
878 printf ("HTTP CRITICAL: pattern not found%s|time=%d\n",
879 (display_html ? "</A>" : ""), (int) (end_time - start_time));
880 exit (STATE_CRITICAL);
881 }
882 else {
883 regerror (errcode, &preg, errbuf, MAX_INPUT_BUFFER);
884 printf ("Execute Error: %s\n", errbuf);
885 exit (STATE_CRITICAL);
886 }
887 }
888 }
889 #endif
891 /* We only get here if all tests have been passed */
892 msg = ssprintf (msg, "HTTP ok: %s - %d second response time %s%s|time=%d\n",
893 status_line, (int) (end_time - start_time),
894 timestamp, (display_html ? "</A>" : ""), (int) (end_time - start_time));
895 terminate (STATE_OK, msg);
896 return STATE_UNKNOWN;
897 }
901 #ifdef HAVE_SSL
902 int connect_SSL (void)
903 {
904 SSL_METHOD *meth;
906 randbuff = strscpy (NULL, "qwertyuiopasdfghjkl");
907 RAND_seed (randbuff, strlen (randbuff));
908 /* Initialize SSL context */
909 SSLeay_add_ssl_algorithms ();
910 meth = SSLv23_client_method ();
911 SSL_load_error_strings ();
912 if ((ctx = SSL_CTX_new (meth)) == NULL) {
913 printf ("ERROR: Cannot create SSL context.\n");
914 return STATE_CRITICAL;
915 }
917 /* Initialize alarm signal handling */
918 signal (SIGALRM, socket_timeout_alarm_handler);
920 /* Set socket timeout */
921 alarm (socket_timeout);
923 /* Save start time */
924 time (&start_time);
926 /* Make TCP connection */
927 if (my_tcp_connect (server_address, server_port, &sd) == STATE_OK) {
928 /* Do the SSL handshake */
929 if ((ssl = SSL_new (ctx)) != NULL) {
930 SSL_set_cipher_list(ssl, "ALL");
931 SSL_set_fd (ssl, sd);
932 if (SSL_connect (ssl) != -1)
933 return OK;
934 ERR_print_errors_fp (stderr);
935 }
936 else {
937 printf ("ERROR: Cannot initiate SSL handshake.\n");
938 }
939 SSL_free (ssl);
940 }
942 SSL_CTX_free (ctx);
943 close (sd);
945 return STATE_CRITICAL;
946 }
947 #endif
949 #ifdef HAVE_SSL
950 int
951 check_certificate (X509 ** certificate)
952 {
953 ASN1_STRING *tm;
954 int offset;
955 struct tm stamp;
956 int days_left;
959 /* Retrieve timestamp of certificate */
960 tm = X509_get_notAfter (*certificate);
962 /* Generate tm structure to process timestamp */
963 if (tm->type == V_ASN1_UTCTIME) {
964 if (tm->length < 10) {
965 printf ("ERROR: Wrong time format in certificate.\n");
966 return STATE_CRITICAL;
967 }
968 else {
969 stamp.tm_year = (tm->data[0] - '0') * 10 + (tm->data[1] - '0');
970 if (stamp.tm_year < 50)
971 stamp.tm_year += 100;
972 offset = 0;
973 }
974 }
975 else {
976 if (tm->length < 12) {
977 printf ("ERROR: Wrong time format in certificate.\n");
978 return STATE_CRITICAL;
979 }
980 else {
981 stamp.tm_year =
982 (tm->data[0] - '0') * 1000 + (tm->data[1] - '0') * 100 +
983 (tm->data[2] - '0') * 10 + (tm->data[3] - '0');
984 stamp.tm_year -= 1900;
985 offset = 2;
986 }
987 }
988 stamp.tm_mon =
989 (tm->data[2 + offset] - '0') * 10 + (tm->data[3 + offset] - '0') - 1;
990 stamp.tm_mday =
991 (tm->data[4 + offset] - '0') * 10 + (tm->data[5 + offset] - '0');
992 stamp.tm_hour =
993 (tm->data[6 + offset] - '0') * 10 + (tm->data[7 + offset] - '0');
994 stamp.tm_min =
995 (tm->data[8 + offset] - '0') * 10 + (tm->data[9 + offset] - '0');
996 stamp.tm_sec = 0;
997 stamp.tm_isdst = -1;
999 days_left = (mktime (&stamp) - time (NULL)) / 86400;
1000 snprintf
1001 (timestamp, 16, "%02d/%02d/%04d %02d:%02d",
1002 stamp.tm_mon + 1,
1003 stamp.tm_mday, stamp.tm_year + 1900, stamp.tm_hour, stamp.tm_min);
1005 if (days_left > 0 && days_left <= days_till_exp) {
1006 printf ("Certificate expires in %d day(s) (%s).\n", days_left, timestamp);
1007 return STATE_WARNING;
1008 }
1009 if (days_left < 0) {
1010 printf ("Certificate expired on %s.\n", timestamp);
1011 return STATE_CRITICAL;
1012 }
1014 if (days_left == 0) {
1015 printf ("Certificate expires today (%s).\n", timestamp);
1016 return STATE_WARNING;
1017 }
1019 printf ("Certificate will expire on %s.\n", timestamp);
1021 return STATE_OK;
1022 }
1023 #endif
1024 \f
1027 int
1028 my_recv (void)
1029 {
1030 int i;
1031 #ifdef HAVE_SSL
1032 if (use_ssl) {
1033 i = SSL_read (ssl, buffer, MAX_INPUT_BUFFER - 1);
1034 }
1035 else {
1036 i = recv (sd, buffer, MAX_INPUT_BUFFER - 1, 0);
1037 }
1038 #else
1039 i = recv (sd, buffer, MAX_INPUT_BUFFER - 1, 0);
1040 #endif
1041 return i;
1042 }
1045 int
1046 my_close (void)
1047 {
1048 #ifdef HAVE_SSL
1049 if (use_ssl == TRUE) {
1050 SSL_shutdown (ssl);
1051 SSL_free (ssl);
1052 SSL_CTX_free (ctx);
1053 return 0;
1054 }
1055 else {
1056 #endif
1057 return close (sd);
1058 #ifdef HAVE_SSL
1059 }
1060 #endif
1061 }
1062 \f
1065 void
1066 print_help (void)
1067 {
1068 print_revision (PROGNAME, REVISION);
1069 printf
1070 ("Copyright (c) %s %s <%s>\n\n%s\n",
1071 COPYRIGHT, AUTHORS, EMAIL, SUMMARY);
1072 print_usage ();
1073 printf ("NOTE: One or both of -H and -I must be specified\n");
1074 printf ("\nOptions:\n" LONGOPTIONS "\n", HTTP_EXPECT, HTTP_PORT,
1075 DEFAULT_SOCKET_TIMEOUT, SSLOPTIONS);
1076 #ifdef HAVE_SSL
1077 printf (SSLDESCRIPTION);
1078 #endif
1079 }
1082 void
1083 print_usage (void)
1084 {
1085 printf ("Usage:\n" " %s %s\n"
1086 #ifdef HAVE_GETOPT_H
1087 " %s (-h | --help) for detailed help\n"
1088 " %s (-V | --version) for version information\n",
1089 #else
1090 " %s -h for detailed help\n"
1091 " %s -V for version information\n",
1092 #endif
1093 PROGNAME, OPTIONS, PROGNAME, PROGNAME);
1094 }