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 full_page = strscat (full_page, buffer);
667 pagesize += i;
668 }
670 if (i < 0)
671 terminate (STATE_CRITICAL, "Error in recv()");
673 /* return a CRITICAL status if we couldn't read any data */
674 if (pagesize == (size_t) 0)
675 terminate (STATE_CRITICAL, "No data received %s", timestamp);
677 /* close the connection */
678 my_close ();
680 /* reset the alarm */
681 alarm (0);
683 /* leave full_page untouched so we can free it later */
684 page = full_page;
686 if (verbose)
687 printf ("Page is %d characters\n", pagesize);
689 /* find status line and null-terminate it */
690 status_line = page;
691 page += (size_t) strcspn (page, "\r\n");
692 pos = page;
693 page += (size_t) strspn (page, "\r\n");
694 status_line[pos - status_line] = 0;
695 strip (status_line);
696 if (verbose)
697 printf ("STATUS: %s\n", status_line);
699 /* find header info and null terminate it */
700 header = page;
701 while (strcspn (page, "\r\n") > 0) {
702 page += (size_t) strcspn (page, "\r\n");
703 pos = page;
704 if ((strspn (page, "\r") == 1 && strspn (page, "\r\n") >= 2) ||
705 (strspn (page, "\n") == 1 && strspn (page, "\r\n") >= 2))
706 page += (size_t) 2;
707 else
708 page += (size_t) 1;
709 }
710 page += (size_t) strspn (page, "\r\n");
711 header[pos - header] = 0;
712 if (verbose)
713 printf ("**** HEADER ****\n%s\n**** CONTENT ****\n%s\n", header, page);
715 /* make sure the status line matches the response we are looking for */
716 if (!strstr (status_line, server_expect)) {
717 if (server_port == HTTP_PORT)
718 msg = ssprintf (msg, "Invalid HTTP response received from host\n");
719 else
720 msg = ssprintf (msg,
721 "Invalid HTTP response received from host on port %d\n",
722 server_port);
723 terminate (STATE_CRITICAL, msg);
724 }
727 /* Exit here if server_expect was set by user and not default */
728 if ( server_expect_yn ) {
729 msg = ssprintf (msg, "HTTP OK: Status line output matched \"%s\"\n",
730 server_expect);
731 if (verbose)
732 printf ("%s\n",msg);
734 }
735 else {
738 /* check the return code */
739 /* server errors result in a critical state */
740 if (strstr (status_line, "500") ||
741 strstr (status_line, "501") ||
742 strstr (status_line, "502") ||
743 strstr (status_line, "503")) {
744 msg = ssprintf (msg, "HTTP CRITICAL: %s\n", status_line);
745 terminate (STATE_CRITICAL, msg);
746 }
748 /* client errors result in a warning state */
749 if (strstr (status_line, "400") ||
750 strstr (status_line, "401") ||
751 strstr (status_line, "402") ||
752 strstr (status_line, "403") ||
753 strstr (status_line, "404")) {
754 msg = ssprintf (msg, "HTTP WARNING: %s\n", status_line);
755 terminate (STATE_WARNING, msg);
756 }
758 /* check redirected page if specified */
759 if (strstr (status_line, "300") ||
760 strstr (status_line, "301") ||
761 strstr (status_line, "302") ||
762 strstr (status_line, "303") ||
763 strstr (status_line, "304")) {
764 if (onredirect == STATE_DEPENDENT) {
766 orig_url = strscpy(NULL, server_url);
767 pos = header;
768 while (pos) {
769 server_address = realloc (server_address, MAX_IPV4_HOSTLENGTH);
770 if (server_address == NULL)
771 terminate (STATE_UNKNOWN,
772 "HTTP UNKNOWN: could not allocate server_address");
773 if (strcspn (pos, "\r\n") > server_url_length) {
774 server_url = realloc (server_url, strcspn (pos, "\r\n"));
775 if (server_url == NULL)
776 terminate (STATE_UNKNOWN,
777 "HTTP UNKNOWN: could not allocate server_url");
778 server_url_length = strcspn (pos, "\r\n");
779 }
780 if (sscanf (pos, HDR_LOCATION URI_HTTP URI_HOST URI_PORT URI_PATH, server_type, server_address, server_port_text, server_url) == 4) {
781 host_name = strscpy (host_name, server_address);
782 use_ssl = server_type_check (server_type);
783 server_port = atoi (server_port_text);
784 check_http ();
785 }
786 else if (sscanf (pos, HDR_LOCATION URI_HTTP URI_HOST URI_PATH, server_type, server_address, server_url) == 3 ) {
787 host_name = strscpy (host_name, server_address);
788 use_ssl = server_type_check (server_type);
789 server_port = server_port_check (use_ssl);
790 check_http ();
791 }
792 else if (sscanf (pos, HDR_LOCATION URI_HTTP URI_HOST URI_PORT, server_type, server_address, server_port_text) == 3) {
793 host_name = strscpy (host_name, server_address);
794 strcpy (server_url, "/");
795 use_ssl = server_type_check (server_type);
796 server_port = atoi (server_port_text);
797 check_http ();
798 }
799 else if (sscanf (pos, HDR_LOCATION URI_HTTP URI_HOST, server_type, server_address) == 2) {
800 host_name = strscpy (host_name, server_address);
801 strcpy (server_url, "/");
802 use_ssl = server_type_check (server_type);
803 server_port = server_port_check (use_ssl);
804 check_http ();
805 }
806 else if (sscanf (pos, HDR_LOCATION URI_PATH, server_url) == 1) {
807 if ((server_url[0] != '/') && (x = strrchr(orig_url, '/'))) {
808 *x = '\0';
809 server_url = ssprintf (server_url, "%s/%s", orig_url, server_url);
810 }
811 check_http ();
812 }
813 pos += (size_t) strcspn (pos, "\r\n");
814 pos += (size_t) strspn (pos, "\r\n");
815 } /* end while (pos) */
816 printf ("HTTP UNKNOWN: Could not find redirect location - %s%s",
817 status_line, (display_html ? "</A>" : ""));
818 exit (STATE_UNKNOWN);
819 } /* end if (onredirect == STATE_DEPENDENT) */
821 else if (onredirect == STATE_UNKNOWN)
822 printf ("HTTP UNKNOWN");
823 else if (onredirect == STATE_OK)
824 printf ("HTTP ok");
825 else if (onredirect == STATE_WARNING)
826 printf ("HTTP WARNING");
827 else if (onredirect == STATE_CRITICAL)
828 printf ("HTTP CRITICAL");
829 time (&end_time);
830 msg = ssprintf (msg, ": %s - %d second response time %s%s|time=%d\n",
831 status_line, (int) (end_time - start_time), timestamp,
832 (display_html ? "</A>" : ""), (int) (end_time - start_time));
833 terminate (onredirect, msg);
834 } /* end if (strstr (status_line, "30[0-4]") */
837 } /* end else (server_expect_yn) */
840 /* check elapsed time */
841 time (&end_time);
842 msg = ssprintf (msg, "HTTP problem: %s - %d second response time %s%s|time=%d\n",
843 status_line, (int) (end_time - start_time), timestamp,
844 (display_html ? "</A>" : ""), (int) (end_time - start_time));
845 if (check_critical_time == TRUE && (end_time - start_time) > critical_time)
846 terminate (STATE_CRITICAL, msg);
847 if (check_warning_time == TRUE && (end_time - start_time) > warning_time)
848 terminate (STATE_WARNING, msg);
850 /* Page and Header content checks go here */
851 /* these checks should be last */
853 if (strlen (string_expect)) {
854 if (strstr (page, string_expect)) {
855 printf ("HTTP ok: %s - %d second response time %s%s|time=%d\n",
856 status_line, (int) (end_time - start_time),
857 timestamp, (display_html ? "</A>" : ""), (int) (end_time - start_time));
858 exit (STATE_OK);
859 }
860 else {
861 printf ("HTTP CRITICAL: string not found%s|time=%d\n",
862 (display_html ? "</A>" : ""), (int) (end_time - start_time));
863 exit (STATE_CRITICAL);
864 }
865 }
866 #ifdef HAVE_REGEX_H
867 if (strlen (regexp)) {
868 errcode = regexec (&preg, page, REGS, pmatch, 0);
869 if (errcode == 0) {
870 printf ("HTTP ok: %s - %d second response time %s%s|time=%d\n",
871 status_line, (int) (end_time - start_time),
872 timestamp, (display_html ? "</A>" : ""), (int) (end_time - start_time));
873 exit (STATE_OK);
874 }
875 else {
876 if (errcode == REG_NOMATCH) {
877 printf ("HTTP CRITICAL: pattern not found%s|time=%d\n",
878 (display_html ? "</A>" : ""), (int) (end_time - start_time));
879 exit (STATE_CRITICAL);
880 }
881 else {
882 regerror (errcode, &preg, errbuf, MAX_INPUT_BUFFER);
883 printf ("Execute Error: %s\n", errbuf);
884 exit (STATE_CRITICAL);
885 }
886 }
887 }
888 #endif
890 /* We only get here if all tests have been passed */
891 msg = ssprintf (msg, "HTTP ok: %s - %d second response time %s%s|time=%d\n",
892 status_line, (int) (end_time - start_time),
893 timestamp, (display_html ? "</A>" : ""), (int) (end_time - start_time));
894 terminate (STATE_OK, msg);
895 return STATE_UNKNOWN;
896 }
900 #ifdef HAVE_SSL
901 int connect_SSL (void)
902 {
903 SSL_METHOD *meth;
905 randbuff = strscpy (NULL, "qwertyuiopasdfghjkl");
906 RAND_seed (randbuff, strlen (randbuff));
907 /* Initialize SSL context */
908 SSLeay_add_ssl_algorithms ();
909 meth = SSLv23_client_method ();
910 SSL_load_error_strings ();
911 if ((ctx = SSL_CTX_new (meth)) == NULL) {
912 printf ("ERROR: Cannot create SSL context.\n");
913 return STATE_CRITICAL;
914 }
916 /* Initialize alarm signal handling */
917 signal (SIGALRM, socket_timeout_alarm_handler);
919 /* Set socket timeout */
920 alarm (socket_timeout);
922 /* Save start time */
923 time (&start_time);
925 /* Make TCP connection */
926 if (my_tcp_connect (server_address, server_port, &sd) == STATE_OK) {
927 /* Do the SSL handshake */
928 if ((ssl = SSL_new (ctx)) != NULL) {
929 SSL_set_cipher_list(ssl, "ALL");
930 SSL_set_fd (ssl, sd);
931 if (SSL_connect (ssl) != -1)
932 return OK;
933 ERR_print_errors_fp (stderr);
934 }
935 else {
936 printf ("ERROR: Cannot initiate SSL handshake.\n");
937 }
938 SSL_free (ssl);
939 }
941 SSL_CTX_free (ctx);
942 close (sd);
944 return STATE_CRITICAL;
945 }
946 #endif
948 #ifdef HAVE_SSL
949 int
950 check_certificate (X509 ** certificate)
951 {
952 ASN1_STRING *tm;
953 int offset;
954 struct tm stamp;
955 int days_left;
958 /* Retrieve timestamp of certificate */
959 tm = X509_get_notAfter (*certificate);
961 /* Generate tm structure to process timestamp */
962 if (tm->type == V_ASN1_UTCTIME) {
963 if (tm->length < 10) {
964 printf ("ERROR: Wrong time format in certificate.\n");
965 return STATE_CRITICAL;
966 }
967 else {
968 stamp.tm_year = (tm->data[0] - '0') * 10 + (tm->data[1] - '0');
969 if (stamp.tm_year < 50)
970 stamp.tm_year += 100;
971 offset = 0;
972 }
973 }
974 else {
975 if (tm->length < 12) {
976 printf ("ERROR: Wrong time format in certificate.\n");
977 return STATE_CRITICAL;
978 }
979 else {
980 stamp.tm_year =
981 (tm->data[0] - '0') * 1000 + (tm->data[1] - '0') * 100 +
982 (tm->data[2] - '0') * 10 + (tm->data[3] - '0');
983 stamp.tm_year -= 1900;
984 offset = 2;
985 }
986 }
987 stamp.tm_mon =
988 (tm->data[2 + offset] - '0') * 10 + (tm->data[3 + offset] - '0') - 1;
989 stamp.tm_mday =
990 (tm->data[4 + offset] - '0') * 10 + (tm->data[5 + offset] - '0');
991 stamp.tm_hour =
992 (tm->data[6 + offset] - '0') * 10 + (tm->data[7 + offset] - '0');
993 stamp.tm_min =
994 (tm->data[8 + offset] - '0') * 10 + (tm->data[9 + offset] - '0');
995 stamp.tm_sec = 0;
996 stamp.tm_isdst = -1;
998 days_left = (mktime (&stamp) - time (NULL)) / 86400;
999 snprintf
1000 (timestamp, 16, "%02d/%02d/%04d %02d:%02d",
1001 stamp.tm_mon + 1,
1002 stamp.tm_mday, stamp.tm_year + 1900, stamp.tm_hour, stamp.tm_min);
1004 if (days_left > 0 && days_left <= days_till_exp) {
1005 printf ("Certificate expires in %d day(s) (%s).\n", days_left, timestamp);
1006 return STATE_WARNING;
1007 }
1008 if (days_left < 0) {
1009 printf ("Certificate expired on %s.\n", timestamp);
1010 return STATE_CRITICAL;
1011 }
1013 if (days_left == 0) {
1014 printf ("Certificate expires today (%s).\n", timestamp);
1015 return STATE_WARNING;
1016 }
1018 printf ("Certificate will expire on %s.\n", timestamp);
1020 return STATE_OK;
1021 }
1022 #endif
1023 \f
1026 int
1027 my_recv (void)
1028 {
1029 int i;
1030 #ifdef HAVE_SSL
1031 if (use_ssl) {
1032 i = SSL_read (ssl, buffer, MAX_INPUT_BUFFER - 1);
1033 }
1034 else {
1035 i = recv (sd, buffer, MAX_INPUT_BUFFER - 1, 0);
1036 }
1037 #else
1038 i = recv (sd, buffer, MAX_INPUT_BUFFER - 1, 0);
1039 #endif
1040 return i;
1041 }
1044 int
1045 my_close (void)
1046 {
1047 #ifdef HAVE_SSL
1048 if (use_ssl == TRUE) {
1049 SSL_shutdown (ssl);
1050 SSL_free (ssl);
1051 SSL_CTX_free (ctx);
1052 return 0;
1053 }
1054 else {
1055 #endif
1056 return close (sd);
1057 #ifdef HAVE_SSL
1058 }
1059 #endif
1060 }
1061 \f
1064 void
1065 print_help (void)
1066 {
1067 print_revision (PROGNAME, REVISION);
1068 printf
1069 ("Copyright (c) %s %s <%s>\n\n%s\n",
1070 COPYRIGHT, AUTHORS, EMAIL, SUMMARY);
1071 print_usage ();
1072 printf ("NOTE: One or both of -H and -I must be specified\n");
1073 printf ("\nOptions:\n" LONGOPTIONS "\n", HTTP_EXPECT, HTTP_PORT,
1074 DEFAULT_SOCKET_TIMEOUT, SSLOPTIONS);
1075 #ifdef HAVE_SSL
1076 printf (SSLDESCRIPTION);
1077 #endif
1078 }
1081 void
1082 print_usage (void)
1083 {
1084 printf ("Usage:\n" " %s %s\n"
1085 #ifdef HAVE_GETOPT_H
1086 " %s (-h | --help) for detailed help\n"
1087 " %s (-V | --version) for version information\n",
1088 #else
1089 " %s -h for detailed help\n"
1090 " %s -V for version information\n",
1091 #endif
1092 PROGNAME, OPTIONS, PROGNAME, PROGNAME);
1093 }