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 asprintf (&server_url, "%s&%s", server_url, timestamp);
226 else
227 asprintf (&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 terminate (STATE_CRITICAL, "Unable to open TCP socket");
545 if ((server_cert = SSL_get_peer_certificate (ssl)) != NULL) {
546 X509_free (server_cert);
547 }
548 else {
549 printf ("ERROR: Cannot retrieve server certificate.\n");
550 return STATE_CRITICAL;
551 }
553 asprintf (&buf, "%s %s HTTP/1.0\r\n", http_method, server_url);
554 if (SSL_write (ssl, buf, strlen (buf)) == -1) {
555 ERR_print_errors_fp (stderr);
556 return STATE_CRITICAL;
557 }
559 /* optionally send the host header info (not clear if it's usable) */
560 if (strcmp (host_name, "")) {
561 asprintf (&buf, "Host: %s\r\n", host_name);
562 if (SSL_write (ssl, buf, strlen (buf)) == -1) {
563 ERR_print_errors_fp (stderr);
564 return STATE_CRITICAL;
565 }
566 }
568 /* send user agent */
569 asprintf (&buf, "User-Agent: check_http/%s (nagios-plugins %s)\r\n",
570 clean_revstring (REVISION), PACKAGE_VERSION);
571 if (SSL_write (ssl, buf, strlen (buf)) == -1) {
572 ERR_print_errors_fp (stderr);
573 return STATE_CRITICAL;
574 }
576 /* optionally send the authentication info */
577 if (strcmp (user_auth, "")) {
578 auth = base64 (user_auth, strlen (user_auth));
579 asprintf (&buf, "Authorization: Basic %s\r\n", auth);
580 if (SSL_write (ssl, buf, strlen (buf)) == -1) {
581 ERR_print_errors_fp (stderr);
582 return STATE_CRITICAL;
583 }
584 }
586 /* optionally send http POST data */
587 if (http_post_data) {
588 asprintf (&buf, "Content-Type: application/x-www-form-urlencoded\r\n");
589 if (SSL_write (ssl, buf, strlen (buf)) == -1) {
590 ERR_print_errors_fp (stderr);
591 return STATE_CRITICAL;
592 }
593 asprintf (&buf, "Content-Length: %i\r\n\r\n", strlen (http_post_data));
594 if (SSL_write (ssl, buf, strlen (buf)) == -1) {
595 ERR_print_errors_fp (stderr);
596 return STATE_CRITICAL;
597 }
598 http_post_data = strscat (http_post_data, "\r\n");
599 if (SSL_write (ssl, http_post_data, strlen (http_post_data)) == -1) {
600 ERR_print_errors_fp (stderr);
601 return STATE_CRITICAL;
602 }
603 }
605 /* send a newline so the server knows we're done with the request */
606 asprintf (&buf, "\r\n\r\n");
607 if (SSL_write (ssl, buf, strlen (buf)) == -1) {
608 ERR_print_errors_fp (stderr);
609 return STATE_CRITICAL;
610 }
612 }
613 else {
614 #endif
615 if (my_tcp_connect (server_address, server_port, &sd) != STATE_OK)
616 terminate (STATE_CRITICAL, "Unable to open TCP socket");
617 asprintf (&buf, "%s %s HTTP/1.0\r\n", http_method, server_url);
618 send (sd, buf, strlen (buf), 0);
622 /* optionally send the host header info */
623 if (strcmp (host_name, "")) {
624 asprintf (&buf, "Host: %s\r\n", host_name);
625 send (sd, buf, strlen (buf), 0);
626 }
628 /* send user agent */
629 asprintf (&buf,
630 "User-Agent: check_http/%s (nagios-plugins %s)\r\n",
631 clean_revstring (REVISION), PACKAGE_VERSION);
632 send (sd, buf, strlen (buf), 0);
634 /* optionally send the authentication info */
635 if (strcmp (user_auth, "")) {
636 auth = base64 (user_auth, strlen (user_auth));
637 asprintf (&buf, "Authorization: Basic %s\r\n", auth);
638 send (sd, buf, strlen (buf), 0);
639 }
641 /* optionally send http POST data */
642 /* written by Chris Henesy <lurker@shadowtech.org> */
643 if (http_post_data) {
644 asprintf (&buf, "Content-Type: application/x-www-form-urlencoded\r\n");
645 send (sd, buf, strlen (buf), 0);
646 asprintf (&buf, "Content-Length: %i\r\n\r\n", strlen (http_post_data));
647 send (sd, buf, strlen (buf), 0);
648 http_post_data = strscat (http_post_data, "\r\n");
649 send (sd, http_post_data, strlen (http_post_data), 0);
650 }
652 /* send a newline so the server knows we're done with the request */
653 asprintf (&buf, "\r\n\r\n");
654 send (sd, buf, strlen (buf), 0);
655 #ifdef HAVE_SSL
656 }
657 #endif
659 /* fetch the page */
660 pagesize = (size_t) 0;
661 while ((i = my_recv ()) > 0) {
662 buffer[i] = '\0';
663 full_page = strscat (full_page, buffer);
664 pagesize += i;
665 }
667 if (i < 0)
668 terminate (STATE_CRITICAL, "Error in recv()");
670 /* return a CRITICAL status if we couldn't read any data */
671 if (pagesize == (size_t) 0)
672 terminate (STATE_CRITICAL, "No data received %s", timestamp);
674 /* close the connection */
675 my_close ();
677 /* reset the alarm */
678 alarm (0);
680 /* leave full_page untouched so we can free it later */
681 page = full_page;
683 if (verbose)
684 printf ("Page is %d characters\n", pagesize);
686 /* find status line and null-terminate it */
687 status_line = page;
688 page += (size_t) strcspn (page, "\r\n");
689 pos = page;
690 page += (size_t) strspn (page, "\r\n");
691 status_line[pos - status_line] = 0;
692 strip (status_line);
693 if (verbose)
694 printf ("STATUS: %s\n", status_line);
696 /* find header info and null terminate it */
697 header = page;
698 while (strcspn (page, "\r\n") > 0) {
699 page += (size_t) strcspn (page, "\r\n");
700 pos = page;
701 if ((strspn (page, "\r") == 1 && strspn (page, "\r\n") >= 2) ||
702 (strspn (page, "\n") == 1 && strspn (page, "\r\n") >= 2))
703 page += (size_t) 2;
704 else
705 page += (size_t) 1;
706 }
707 page += (size_t) strspn (page, "\r\n");
708 header[pos - header] = 0;
709 if (verbose)
710 printf ("**** HEADER ****\n%s\n**** CONTENT ****\n%s\n", header, page);
712 /* make sure the status line matches the response we are looking for */
713 if (!strstr (status_line, server_expect)) {
714 if (server_port == HTTP_PORT)
715 asprintf (&msg, "Invalid HTTP response received from host\n");
716 else
717 asprintf (&msg,
718 "Invalid HTTP response received from host on port %d\n",
719 server_port);
720 terminate (STATE_CRITICAL, msg);
721 }
724 /* Exit here if server_expect was set by user and not default */
725 if ( server_expect_yn ) {
726 asprintf (&msg, "HTTP OK: Status line output matched \"%s\"\n",
727 server_expect);
728 if (verbose)
729 printf ("%s\n",msg);
731 }
732 else {
735 /* check the return code */
736 /* server errors result in a critical state */
737 if (strstr (status_line, "500") ||
738 strstr (status_line, "501") ||
739 strstr (status_line, "502") ||
740 strstr (status_line, "503")) {
741 terminate (STATE_CRITICAL, "HTTP CRITICAL: %s\n", status_line);
742 }
744 /* client errors result in a warning state */
745 if (strstr (status_line, "400") ||
746 strstr (status_line, "401") ||
747 strstr (status_line, "402") ||
748 strstr (status_line, "403") ||
749 strstr (status_line, "404")) {
750 terminate (STATE_WARNING, "HTTP WARNING: %s\n", status_line);
751 }
753 /* check redirected page if specified */
754 if (strstr (status_line, "300") ||
755 strstr (status_line, "301") ||
756 strstr (status_line, "302") ||
757 strstr (status_line, "303") ||
758 strstr (status_line, "304")) {
759 if (onredirect == STATE_DEPENDENT) {
761 orig_url = strscpy(NULL, server_url);
762 pos = header;
763 while (pos) {
764 server_address = realloc (server_address, MAX_IPV4_HOSTLENGTH);
765 if (server_address == NULL)
766 terminate (STATE_UNKNOWN,
767 "HTTP UNKNOWN: could not allocate server_address");
768 if (strcspn (pos, "\r\n") > server_url_length) {
769 server_url = realloc (server_url, strcspn (pos, "\r\n"));
770 if (server_url == NULL)
771 terminate (STATE_UNKNOWN,
772 "HTTP UNKNOWN: could not allocate server_url");
773 server_url_length = strcspn (pos, "\r\n");
774 }
775 if (sscanf (pos, HDR_LOCATION URI_HTTP URI_HOST URI_PORT URI_PATH, server_type, server_address, server_port_text, server_url) == 4) {
776 host_name = strscpy (host_name, server_address);
777 use_ssl = server_type_check (server_type);
778 server_port = atoi (server_port_text);
779 check_http ();
780 }
781 else if (sscanf (pos, HDR_LOCATION URI_HTTP URI_HOST URI_PATH, server_type, server_address, server_url) == 3 ) {
782 host_name = strscpy (host_name, server_address);
783 use_ssl = server_type_check (server_type);
784 server_port = server_port_check (use_ssl);
785 check_http ();
786 }
787 else if (sscanf (pos, HDR_LOCATION URI_HTTP URI_HOST URI_PORT, server_type, server_address, server_port_text) == 3) {
788 host_name = strscpy (host_name, server_address);
789 strcpy (server_url, "/");
790 use_ssl = server_type_check (server_type);
791 server_port = atoi (server_port_text);
792 check_http ();
793 }
794 else if (sscanf (pos, HDR_LOCATION URI_HTTP URI_HOST, server_type, server_address) == 2) {
795 host_name = strscpy (host_name, server_address);
796 strcpy (server_url, "/");
797 use_ssl = server_type_check (server_type);
798 server_port = server_port_check (use_ssl);
799 check_http ();
800 }
801 else if (sscanf (pos, HDR_LOCATION URI_PATH, server_url) == 1) {
802 if ((server_url[0] != '/') && (x = strrchr(orig_url, '/'))) {
803 *x = '\0';
804 asprintf (&server_url, "%s/%s", orig_url, server_url);
805 }
806 check_http ();
807 }
808 pos += (size_t) strcspn (pos, "\r\n");
809 pos += (size_t) strspn (pos, "\r\n");
810 } /* end while (pos) */
811 printf ("HTTP UNKNOWN: Could not find redirect location - %s%s",
812 status_line, (display_html ? "</A>" : ""));
813 exit (STATE_UNKNOWN);
814 } /* end if (onredirect == STATE_DEPENDENT) */
816 else if (onredirect == STATE_UNKNOWN)
817 printf ("HTTP UNKNOWN");
818 else if (onredirect == STATE_OK)
819 printf ("HTTP ok");
820 else if (onredirect == STATE_WARNING)
821 printf ("HTTP WARNING");
822 else if (onredirect == STATE_CRITICAL)
823 printf ("HTTP CRITICAL");
824 time (&end_time);
825 asprintf (&msg, ": %s - %d second response time %s%s|time=%d\n",
826 status_line, (int) (end_time - start_time), timestamp,
827 (display_html ? "</A>" : ""), (int) (end_time - start_time));
828 terminate (onredirect, msg);
829 } /* end if (strstr (status_line, "30[0-4]") */
832 } /* end else (server_expect_yn) */
835 /* check elapsed time */
836 time (&end_time);
837 asprintf (&msg, "HTTP problem: %s - %d second response time %s%s|time=%d\n",
838 status_line, (int) (end_time - start_time), timestamp,
839 (display_html ? "</A>" : ""), (int) (end_time - start_time));
840 if (check_critical_time == TRUE && (end_time - start_time) > critical_time)
841 terminate (STATE_CRITICAL, msg);
842 if (check_warning_time == TRUE && (end_time - start_time) > warning_time)
843 terminate (STATE_WARNING, msg);
845 /* Page and Header content checks go here */
846 /* these checks should be last */
848 if (strlen (string_expect)) {
849 if (strstr (page, string_expect)) {
850 printf ("HTTP ok: %s - %d second response time %s%s|time=%d\n",
851 status_line, (int) (end_time - start_time),
852 timestamp, (display_html ? "</A>" : ""), (int) (end_time - start_time));
853 exit (STATE_OK);
854 }
855 else {
856 printf ("HTTP CRITICAL: string not found%s|time=%d\n",
857 (display_html ? "</A>" : ""), (int) (end_time - start_time));
858 exit (STATE_CRITICAL);
859 }
860 }
861 #ifdef HAVE_REGEX_H
862 if (strlen (regexp)) {
863 errcode = regexec (&preg, page, REGS, pmatch, 0);
864 if (errcode == 0) {
865 printf ("HTTP ok: %s - %d second response time %s%s|time=%d\n",
866 status_line, (int) (end_time - start_time),
867 timestamp, (display_html ? "</A>" : ""), (int) (end_time - start_time));
868 exit (STATE_OK);
869 }
870 else {
871 if (errcode == REG_NOMATCH) {
872 printf ("HTTP CRITICAL: pattern not found%s|time=%d\n",
873 (display_html ? "</A>" : ""), (int) (end_time - start_time));
874 exit (STATE_CRITICAL);
875 }
876 else {
877 regerror (errcode, &preg, errbuf, MAX_INPUT_BUFFER);
878 printf ("Execute Error: %s\n", errbuf);
879 exit (STATE_CRITICAL);
880 }
881 }
882 }
883 #endif
885 /* We only get here if all tests have been passed */
886 asprintf (&msg, "HTTP ok: %s - %d second response time %s%s|time=%d\n",
887 status_line, (int) (end_time - start_time),
888 timestamp, (display_html ? "</A>" : ""), (int) (end_time - start_time));
889 terminate (STATE_OK, msg);
890 return STATE_UNKNOWN;
891 }
895 #ifdef HAVE_SSL
896 int connect_SSL (void)
897 {
898 SSL_METHOD *meth;
900 randbuff = strscpy (NULL, "qwertyuiopasdfghjkl");
901 RAND_seed (randbuff, strlen (randbuff));
902 /* Initialize SSL context */
903 SSLeay_add_ssl_algorithms ();
904 meth = SSLv23_client_method ();
905 SSL_load_error_strings ();
906 if ((ctx = SSL_CTX_new (meth)) == NULL) {
907 printf ("ERROR: Cannot create SSL context.\n");
908 return STATE_CRITICAL;
909 }
911 /* Initialize alarm signal handling */
912 signal (SIGALRM, socket_timeout_alarm_handler);
914 /* Set socket timeout */
915 alarm (socket_timeout);
917 /* Save start time */
918 time (&start_time);
920 /* Make TCP connection */
921 if (my_tcp_connect (server_address, server_port, &sd) == STATE_OK) {
922 /* Do the SSL handshake */
923 if ((ssl = SSL_new (ctx)) != NULL) {
924 SSL_set_cipher_list(ssl, "ALL");
925 SSL_set_fd (ssl, sd);
926 if (SSL_connect (ssl) != -1)
927 return OK;
928 ERR_print_errors_fp (stderr);
929 }
930 else {
931 printf ("ERROR: Cannot initiate SSL handshake.\n");
932 }
933 SSL_free (ssl);
934 }
936 SSL_CTX_free (ctx);
937 close (sd);
939 return STATE_CRITICAL;
940 }
941 #endif
943 #ifdef HAVE_SSL
944 int
945 check_certificate (X509 ** certificate)
946 {
947 ASN1_STRING *tm;
948 int offset;
949 struct tm stamp;
950 int days_left;
953 /* Retrieve timestamp of certificate */
954 tm = X509_get_notAfter (*certificate);
956 /* Generate tm structure to process timestamp */
957 if (tm->type == V_ASN1_UTCTIME) {
958 if (tm->length < 10) {
959 printf ("ERROR: Wrong time format in certificate.\n");
960 return STATE_CRITICAL;
961 }
962 else {
963 stamp.tm_year = (tm->data[0] - '0') * 10 + (tm->data[1] - '0');
964 if (stamp.tm_year < 50)
965 stamp.tm_year += 100;
966 offset = 0;
967 }
968 }
969 else {
970 if (tm->length < 12) {
971 printf ("ERROR: Wrong time format in certificate.\n");
972 return STATE_CRITICAL;
973 }
974 else {
975 stamp.tm_year =
976 (tm->data[0] - '0') * 1000 + (tm->data[1] - '0') * 100 +
977 (tm->data[2] - '0') * 10 + (tm->data[3] - '0');
978 stamp.tm_year -= 1900;
979 offset = 2;
980 }
981 }
982 stamp.tm_mon =
983 (tm->data[2 + offset] - '0') * 10 + (tm->data[3 + offset] - '0') - 1;
984 stamp.tm_mday =
985 (tm->data[4 + offset] - '0') * 10 + (tm->data[5 + offset] - '0');
986 stamp.tm_hour =
987 (tm->data[6 + offset] - '0') * 10 + (tm->data[7 + offset] - '0');
988 stamp.tm_min =
989 (tm->data[8 + offset] - '0') * 10 + (tm->data[9 + offset] - '0');
990 stamp.tm_sec = 0;
991 stamp.tm_isdst = -1;
993 days_left = (mktime (&stamp) - time (NULL)) / 86400;
994 snprintf
995 (timestamp, 16, "%02d/%02d/%04d %02d:%02d",
996 stamp.tm_mon + 1,
997 stamp.tm_mday, stamp.tm_year + 1900, stamp.tm_hour, stamp.tm_min);
999 if (days_left > 0 && days_left <= days_till_exp) {
1000 printf ("Certificate expires in %d day(s) (%s).\n", days_left, timestamp);
1001 return STATE_WARNING;
1002 }
1003 if (days_left < 0) {
1004 printf ("Certificate expired on %s.\n", timestamp);
1005 return STATE_CRITICAL;
1006 }
1008 if (days_left == 0) {
1009 printf ("Certificate expires today (%s).\n", timestamp);
1010 return STATE_WARNING;
1011 }
1013 printf ("Certificate will expire on %s.\n", timestamp);
1015 return STATE_OK;
1016 }
1017 #endif
1018 \f
1021 int
1022 my_recv (void)
1023 {
1024 int i;
1025 #ifdef HAVE_SSL
1026 if (use_ssl) {
1027 i = SSL_read (ssl, buffer, MAX_INPUT_BUFFER - 1);
1028 }
1029 else {
1030 i = recv (sd, buffer, MAX_INPUT_BUFFER - 1, 0);
1031 }
1032 #else
1033 i = recv (sd, buffer, MAX_INPUT_BUFFER - 1, 0);
1034 #endif
1035 return i;
1036 }
1039 int
1040 my_close (void)
1041 {
1042 #ifdef HAVE_SSL
1043 if (use_ssl == TRUE) {
1044 SSL_shutdown (ssl);
1045 SSL_free (ssl);
1046 SSL_CTX_free (ctx);
1047 return 0;
1048 }
1049 else {
1050 #endif
1051 return close (sd);
1052 #ifdef HAVE_SSL
1053 }
1054 #endif
1055 }
1056 \f
1059 void
1060 print_help (void)
1061 {
1062 print_revision (PROGNAME, REVISION);
1063 printf
1064 ("Copyright (c) %s %s <%s>\n\n%s\n",
1065 COPYRIGHT, AUTHORS, EMAIL, SUMMARY);
1066 print_usage ();
1067 printf ("NOTE: One or both of -H and -I must be specified\n");
1068 printf ("\nOptions:\n" LONGOPTIONS "\n", HTTP_EXPECT, HTTP_PORT,
1069 DEFAULT_SOCKET_TIMEOUT, SSLOPTIONS);
1070 #ifdef HAVE_SSL
1071 printf (SSLDESCRIPTION);
1072 #endif
1073 }
1076 void
1077 print_usage (void)
1078 {
1079 printf ("Usage:\n" " %s %s\n"
1080 #ifdef HAVE_GETOPT_H
1081 " %s (-h | --help) for detailed help\n"
1082 " %s (-V | --version) for version information\n",
1083 #else
1084 " %s -h for detailed help\n"
1085 " %s -V for version information\n",
1086 #endif
1087 PROGNAME, OPTIONS, PROGNAME, PROGNAME);
1088 }