1b4bae348deba5053673fe4a095190e2435c11a5
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 time_t start_time, end_time;
181 char timestamp[10] = "";
182 int specify_port = FALSE;
183 int server_port = HTTP_PORT;
184 char server_port_text[6] = "";
185 char server_type[6] = "http";
186 char *server_address = NULL;
187 char *host_name = NULL;
188 char *server_url = NULL;
189 int server_url_length = 0;
190 int server_expect_yn = 0;
191 char server_expect[MAX_INPUT_BUFFER] = HTTP_EXPECT;
192 char string_expect[MAX_INPUT_BUFFER] = "";
193 int warning_time = 0;
194 int check_warning_time = FALSE;
195 int critical_time = 0;
196 int check_critical_time = FALSE;
197 char user_auth[MAX_INPUT_BUFFER] = "";
198 int display_html = FALSE;
199 int onredirect = STATE_OK;
200 int use_ssl = FALSE;
201 int verbose = FALSE;
202 int sd;
203 char *http_method = NULL;
204 char *http_post_data = NULL;
205 char buffer[MAX_INPUT_BUFFER];
207 void print_usage (void);
208 void print_help (void);
209 int process_arguments (int, char **);
210 int call_getopt (int, char **);
211 static char *base64 (char *bin, int len);
212 int check_http (void);
213 int my_recv (void);
214 int my_close (void);
216 int
217 main (int argc, char **argv)
218 {
219 int result = STATE_UNKNOWN;
221 if (process_arguments (argc, argv) == ERROR)
222 usage ("check_http: could not parse arguments\n");
224 if (strstr (timestamp, ":")) {
225 if (strstr (server_url, "?"))
226 sprintf (server_url, "%s&%s", server_url, timestamp);
227 else
228 sprintf (server_url, "%s?%s", server_url, timestamp);
229 }
231 if (display_html == TRUE)
232 printf ("<A HREF=\"http://%s:%d%s\" target=\"_blank\">",
233 host_name, server_port, server_url);
235 /* initialize alarm signal handling, set socket timeout, start timer */
236 signal (SIGALRM, socket_timeout_alarm_handler);
237 alarm (socket_timeout);
238 time (&start_time);
240 #ifdef HAVE_SSL
241 if (use_ssl && check_cert == TRUE) {
242 if (connect_SSL () != OK)
243 terminate (STATE_CRITICAL,
244 "HTTP CRITICAL - Could not make SSL connection\n");
245 if ((server_cert = SSL_get_peer_certificate (ssl)) != NULL) {
246 result = check_certificate (&server_cert);
247 X509_free (server_cert);
248 }
249 else {
250 printf ("ERROR: Cannot retrieve server certificate.\n");
251 result = STATE_CRITICAL;
252 }
253 SSL_shutdown (ssl);
254 SSL_free (ssl);
255 SSL_CTX_free (ctx);
256 close (sd);
257 }
258 else {
259 result = check_http ();
260 }
261 #else
262 result = check_http ();
263 #endif
264 return result;
265 }
266 \f
269 /* process command-line arguments */
270 int
271 process_arguments (int argc, char **argv)
272 {
273 int c, i = 1;
274 char optchars[MAX_INPUT_BUFFER];
276 #ifdef HAVE_GETOPT_H
277 int option_index = 0;
278 static struct option long_options[] = {
279 STD_OPTS_LONG,
280 {"link", no_argument, 0, 'L'},
281 {"nohtml", no_argument, 0, 'n'},
282 {"ssl", no_argument, 0, 'S'},
283 {"verbose", no_argument, 0, 'v'},
284 {"post", required_argument, 0, 'P'},
285 {"IP-address", required_argument, 0, 'I'},
286 {"string", required_argument, 0, 's'},
287 {"regex", required_argument, 0, 'r'},
288 {"ereg", required_argument, 0, 'r'},
289 {"eregi", required_argument, 0, 'R'},
290 {"onredirect", required_argument, 0, 'f'},
291 {"certificate", required_argument, 0, 'C'},
292 {0, 0, 0, 0}
293 };
294 #endif
296 if (argc < 2)
297 return ERROR;
299 for (c = 1; c < argc; c++) {
300 if (strcmp ("-to", argv[c]) == 0)
301 strcpy (argv[c], "-t");
302 if (strcmp ("-hn", argv[c]) == 0)
303 strcpy (argv[c], "-H");
304 if (strcmp ("-wt", argv[c]) == 0)
305 strcpy (argv[c], "-w");
306 if (strcmp ("-ct", argv[c]) == 0)
307 strcpy (argv[c], "-c");
308 if (strcmp ("-nohtml", argv[c]) == 0)
309 strcpy (argv[c], "-n");
310 }
312 snprintf (optchars, MAX_INPUT_BUFFER, "%s%s", STD_OPTS,
313 "P:I:a:e:p:s:R:r:u:f:C:nLS");
315 while (1) {
316 #ifdef HAVE_GETOPT_H
317 c = getopt_long (argc, argv, optchars, long_options, &option_index);
318 #else
319 c = getopt (argc, argv, optchars);
320 #endif
321 if (c == -1 || c == EOF)
322 break;
324 switch (c) {
325 case '?': /* usage */
326 usage2 ("unknown argument", optarg);
327 break;
328 case 'h': /* help */
329 print_help ();
330 exit (STATE_OK);
331 break;
332 case 'V': /* version */
333 print_revision (PROGNAME, REVISION);
334 exit (STATE_OK);
335 break;
336 case 't': /* timeout period */
337 if (!is_intnonneg (optarg))
338 usage2 ("timeout interval must be a non-negative integer", optarg);
339 socket_timeout = atoi (optarg);
340 break;
341 case 'c': /* critical time threshold */
342 if (!is_intnonneg (optarg))
343 usage2 ("invalid critical threshold", optarg);
344 critical_time = atoi (optarg);
345 check_critical_time = TRUE;
346 break;
347 case 'w': /* warning time threshold */
348 if (!is_intnonneg (optarg))
349 usage2 ("invalid warning threshold", optarg);
350 warning_time = atoi (optarg);
351 check_warning_time = TRUE;
352 break;
353 case 'L': /* show html link */
354 display_html = TRUE;
355 break;
356 case 'n': /* do not show html link */
357 display_html = FALSE;
358 break;
359 case 'S': /* use SSL */
360 #ifndef HAVE_SSL
361 usage ("check_http: invalid option - SSL is not available\n");
362 #endif
363 use_ssl = TRUE;
364 if (specify_port == FALSE)
365 server_port = HTTPS_PORT;
366 break;
367 case 'C': /* warning time threshold */
368 #ifdef HAVE_SSL
369 if (!is_intnonneg (optarg))
370 usage2 ("invalid certificate expiration period", optarg);
371 days_till_exp = atoi (optarg);
372 check_cert = TRUE;
373 #else
374 usage ("check_http: invalid option - SSL is not available\n");
375 #endif
376 break;
377 case 'f': /* onredirect */
378 if (!strcmp (optarg, "follow"))
379 onredirect = STATE_DEPENDENT;
380 if (!strcmp (optarg, "unknown"))
381 onredirect = STATE_UNKNOWN;
382 if (!strcmp (optarg, "ok"))
383 onredirect = STATE_OK;
384 if (!strcmp (optarg, "warning"))
385 onredirect = STATE_WARNING;
386 if (!strcmp (optarg, "critical"))
387 onredirect = STATE_CRITICAL;
388 if (verbose)
389 printf("option f:%d \n", onredirect);
390 break;
391 /* Note: H, I, and u must be malloc'd or will fail on redirects */
392 case 'H': /* Host Name (virtual host) */
393 host_name = strscpy (host_name, optarg);
394 break;
395 case 'I': /* Server IP-address */
396 server_address = strscpy (server_address, optarg);
397 break;
398 case 'u': /* Host or server */
399 server_url = strscpy (server_url, optarg);
400 server_url_length = strlen (optarg);
401 break;
402 case 'p': /* Host or server */
403 if (!is_intnonneg (optarg))
404 usage2 ("invalid port number", optarg);
405 server_port = atoi (optarg);
406 specify_port = TRUE;
407 break;
408 case 'a': /* authorization info */
409 strncpy (user_auth, optarg, MAX_INPUT_BUFFER - 1);
410 user_auth[MAX_INPUT_BUFFER - 1] = 0;
411 break;
412 case 'P': /* HTTP POST data in URL encoded format */
413 http_method = strscpy (http_method, "POST");
414 http_post_data = strscpy (http_post_data, optarg);
415 break;
416 case 's': /* string or substring */
417 strncpy (string_expect, optarg, MAX_INPUT_BUFFER - 1);
418 string_expect[MAX_INPUT_BUFFER - 1] = 0;
419 break;
420 case 'e': /* string or substring */
421 strncpy (server_expect, optarg, MAX_INPUT_BUFFER - 1);
422 server_expect[MAX_INPUT_BUFFER - 1] = 0;
423 server_expect_yn = 1;
424 break;
425 case 'R': /* regex */
426 #ifdef HAVE_REGEX_H
427 cflags = REG_ICASE;
428 #else
429 usage ("check_http: call for regex which was not a compiled option\n");
430 #endif
431 case 'r': /* regex */
432 #ifdef HAVE_REGEX_H
433 cflags |= REG_EXTENDED | REG_NOSUB | REG_NEWLINE;
434 strncpy (regexp, optarg, MAX_INPUT_BUFFER - 1);
435 regexp[MAX_INPUT_BUFFER - 1] = 0;
436 errcode = regcomp (&preg, regexp, cflags);
437 if (errcode != 0) {
438 regerror (errcode, &preg, errbuf, MAX_INPUT_BUFFER);
439 printf ("Could Not Compile Regular Expression: %s", errbuf);
440 return ERROR;
441 }
442 #else
443 usage ("check_http: call for regex which was not a compiled option\n");
444 #endif
445 break;
446 case 'v': /* verbose */
447 verbose = TRUE;
448 break;
449 }
450 }
452 c = optind;
454 if (server_address == NULL && host_name == NULL) {
455 server_address = strscpy (NULL, argv[c]);
456 host_name = strscpy (NULL, argv[c++]);
457 }
459 if (server_address == NULL && host_name == NULL)
460 usage ("check_http: you must specify a host name\n");
462 if (server_address == NULL)
463 server_address = strscpy (NULL, host_name);
465 if (host_name == NULL)
466 host_name = strscpy (NULL, server_address);
468 if (http_method == NULL)
469 http_method = strscpy (http_method, "GET");
471 if (server_url == NULL) {
472 server_url = strscpy (NULL, "/");
473 server_url_length = strlen(HTTP_URL);
474 }
476 return TRUE;
477 }
478 \f
481 /* written by lauri alanko */
482 static char *
483 base64 (char *bin, int len)
484 {
486 char *buf = (char *) malloc ((len + 2) / 3 * 4 + 1);
487 int i = 0, j = 0;
489 char BASE64_END = '=';
490 char base64_table[64] = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
491 "abcdefghijklmnopqrstuvwxyz"
492 "0123456789+/";
494 while (j < len - 2) {
495 buf[i++] = base64_table[bin[j] >> 2];
496 buf[i++] = base64_table[((bin[j] & 3) << 4) | (bin[j + 1] >> 4)];
497 buf[i++] = base64_table[((bin[j + 1] & 15) << 2) | (bin[j + 2] >> 6)];
498 buf[i++] = base64_table[bin[j + 2] & 63];
499 j += 3;
500 }
502 switch (len - j) {
503 case 1:
504 buf[i++] = base64_table[bin[j] >> 2];
505 buf[i++] = base64_table[(bin[j] & 3) << 4];
506 buf[i++] = BASE64_END;
507 buf[i++] = BASE64_END;
508 break;
509 case 2:
510 buf[i++] = base64_table[bin[j] >> 2];
511 buf[i++] = base64_table[((bin[j] & 3) << 4) | (bin[j + 1] >> 4)];
512 buf[i++] = base64_table[(bin[j + 1] & 15) << 2];
513 buf[i++] = BASE64_END;
514 break;
515 case 0:
516 break;
517 }
519 buf[i] = '\0';
520 return buf;
521 }
522 \f
525 int
526 check_http (void)
527 {
528 char *msg = NULL;
529 char *status_line = NULL;
530 char *header = NULL;
531 char *page = NULL;
532 char *auth = NULL;
533 int i = 0;
534 size_t pagesize = 0;
535 char *full_page = NULL;
536 char *pos = 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 sprintf (buffer, "%s %s HTTP/1.0\r\n", http_method, server_url);
556 if (SSL_write (ssl, buffer, strlen (buffer)) == -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 sprintf (buffer, "Host: %s\r\n", host_name);
564 if (SSL_write (ssl, buffer, strlen (buffer)) == -1) {
565 ERR_print_errors_fp (stderr);
566 return STATE_CRITICAL;
567 }
568 }
570 /* send user agent */
571 sprintf (buffer, "User-Agent: check_http/%s (nagios-plugins %s)\r\n",
572 clean_revstring (REVISION), PACKAGE_VERSION);
573 if (SSL_write (ssl, buffer, strlen (buffer)) == -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 sprintf (buffer, "Authorization: Basic %s\r\n", auth);
582 if (SSL_write (ssl, buffer, strlen (buffer)) == -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 sprintf (buffer, "Content-Type: application/x-www-form-urlencoded\r\n");
591 if (SSL_write (ssl, buffer, strlen (buffer)) == -1) {
592 ERR_print_errors_fp (stderr);
593 return STATE_CRITICAL;
594 }
595 sprintf (buffer, "Content-Length: %i\r\n\r\n", strlen (http_post_data));
596 if (SSL_write (ssl, buffer, strlen (buffer)) == -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 sprintf (buffer, "\r\n\r\n");
609 if (SSL_write (ssl, buffer, strlen (buffer)) == -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 sprintf (buffer, "%s %s HTTP/1.0\r\n", http_method, server_url);
622 send (sd, buffer, strlen (buffer), 0);
626 /* optionally send the host header info */
627 if (strcmp (host_name, "")) {
628 sprintf (buffer, "Host: %s\r\n", host_name);
629 send (sd, buffer, strlen (buffer), 0);
630 }
632 /* send user agent */
633 sprintf (buffer,
634 "User-Agent: check_http/%s (nagios-plugins %s)\r\n",
635 clean_revstring (REVISION), PACKAGE_VERSION);
636 send (sd, buffer, strlen (buffer), 0);
638 /* optionally send the authentication info */
639 if (strcmp (user_auth, "")) {
640 auth = base64 (user_auth, strlen (user_auth));
641 sprintf (buffer, "Authorization: Basic %s\r\n", auth);
642 send (sd, buffer, strlen (buffer), 0);
643 }
645 /* optionally send http POST data */
646 /* written by Chris Henesy <lurker@shadowtech.org> */
647 if (http_post_data) {
648 sprintf (buffer, "Content-Type: application/x-www-form-urlencoded\r\n");
649 send (sd, buffer, strlen (buffer), 0);
650 sprintf (buffer, "Content-Length: %i\r\n\r\n", strlen (http_post_data));
651 send (sd, buffer, strlen (buffer), 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 sprintf (buffer, "\r\n\r\n");
658 send (sd, buffer, strlen (buffer), 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 pos = header;
767 while (pos) {
768 server_address = realloc (server_address, MAX_IPV4_HOSTLENGTH);
769 if (server_address == NULL)
770 terminate (STATE_UNKNOWN,
771 "HTTP UNKNOWN: could not allocate server_address");
772 if (strspn (pos, "\r\n") > server_url_length) {
773 server_url = realloc (server_url, strspn (pos, "\r\n"));
774 if (server_url == NULL)
775 terminate (STATE_UNKNOWN,
776 "HTTP UNKNOWN: could not allocate server_url");
777 server_url_length = strspn (pos, "\r\n");
778 }
779 if (sscanf (pos, HDR_LOCATION URI_HTTP URI_HOST URI_PORT URI_PATH, server_type, server_address, server_port_text, server_url) == 4) {
780 host_name = strscpy (host_name, server_address);
781 use_ssl = server_type_check (server_type);
782 server_port = atoi (server_port_text);
783 check_http ();
784 }
785 else if (sscanf (pos, HDR_LOCATION URI_HTTP URI_HOST URI_PATH, server_type, server_address, server_url) == 3 ) {
786 host_name = strscpy (host_name, server_address);
787 use_ssl = server_type_check (server_type);
788 server_port = server_port_check (use_ssl);
789 check_http ();
790 }
791 else if (sscanf (pos, HDR_LOCATION URI_HTTP URI_HOST URI_PORT, server_type, server_address, server_port_text) == 3) {
792 host_name = strscpy (host_name, server_address);
793 strcpy (server_url, "/");
794 use_ssl = server_type_check (server_type);
795 server_port = atoi (server_port_text);
796 check_http ();
797 }
798 else if (sscanf (pos, HDR_LOCATION URI_HTTP URI_HOST, server_type, server_address) == 2) {
799 host_name = strscpy (host_name, server_address);
800 strcpy (server_url, "/");
801 use_ssl = server_type_check (server_type);
802 server_port = server_port_check (use_ssl);
803 check_http ();
804 }
805 else if (sscanf (pos, HDR_LOCATION URI_PATH, server_url) == 1) {
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 msg = ssprintf (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 msg = ssprintf (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 msg = ssprintf (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;
951 /* int result = STATE_OK; */
952 /* char timestamp[14]; */
955 /* Retrieve timestamp of certificate */
956 tm = X509_get_notAfter (*certificate);
958 /* Generate tm structure to process timestamp */
959 if (tm->type == V_ASN1_UTCTIME) {
960 if (tm->length < 10) {
961 printf ("ERROR: Wrong time format in certificate.\n");
962 return STATE_CRITICAL;
963 }
964 else {
965 stamp.tm_year = (tm->data[0] - '0') * 10 + (tm->data[1] - '0');
966 if (stamp.tm_year < 50)
967 stamp.tm_year += 100;
968 offset = 0;
969 }
970 }
971 else {
972 if (tm->length < 12) {
973 printf ("ERROR: Wrong time format in certificate.\n");
974 return STATE_CRITICAL;
975 }
976 else {
977 stamp.tm_year =
978 (tm->data[0] - '0') * 1000 + (tm->data[1] - '0') * 100 +
979 (tm->data[2] - '0') * 10 + (tm->data[3] - '0');
980 stamp.tm_year -= 1900;
981 offset = 2;
982 }
983 }
984 stamp.tm_mon =
985 (tm->data[2 + offset] - '0') * 10 + (tm->data[3 + offset] - '0') - 1;
986 stamp.tm_mday =
987 (tm->data[4 + offset] - '0') * 10 + (tm->data[5 + offset] - '0');
988 stamp.tm_hour =
989 (tm->data[6 + offset] - '0') * 10 + (tm->data[7 + offset] - '0');
990 stamp.tm_min =
991 (tm->data[8 + offset] - '0') * 10 + (tm->data[9 + offset] - '0');
992 stamp.tm_sec = 0;
993 stamp.tm_isdst = -1;
995 days_left = (mktime (&stamp) - time (NULL)) / 86400;
996 sprintf
997 (timestamp, "%02d/%02d/%04d %02d:%02d",
998 stamp.tm_mon + 1,
999 stamp.tm_mday, stamp.tm_year + 1900, stamp.tm_hour, stamp.tm_min);
1001 if (days_left > 0 && days_left <= days_till_exp) {
1002 printf ("Certificate expires in %d day(s) (%s).\n", days_left, timestamp);
1003 return STATE_WARNING;
1004 }
1005 if (days_left < 0) {
1006 printf ("Certificate expired on %s.\n", timestamp);
1007 return STATE_CRITICAL;
1008 }
1010 if (days_left == 0) {
1011 printf ("Certificate expires today (%s).\n", timestamp);
1012 return STATE_WARNING;
1013 }
1015 printf ("Certificate will expire on %s.\n", timestamp);
1017 return STATE_OK;
1018 }
1019 #endif
1020 \f
1023 int
1024 my_recv (void)
1025 {
1026 int i;
1027 #ifdef HAVE_SSL
1028 if (use_ssl) {
1029 i = SSL_read (ssl, buffer, MAX_INPUT_BUFFER - 1);
1030 }
1031 else {
1032 i = recv (sd, buffer, MAX_INPUT_BUFFER - 1, 0);
1033 }
1034 #else
1035 i = recv (sd, buffer, MAX_INPUT_BUFFER - 1, 0);
1036 #endif
1037 return i;
1038 }
1041 int
1042 my_close (void)
1043 {
1044 #ifdef HAVE_SSL
1045 if (use_ssl == TRUE) {
1046 SSL_shutdown (ssl);
1047 SSL_free (ssl);
1048 SSL_CTX_free (ctx);
1049 return 0;
1050 }
1051 else {
1052 #endif
1053 return close (sd);
1054 #ifdef HAVE_SSL
1055 }
1056 #endif
1057 }
1058 \f
1061 void
1062 print_help (void)
1063 {
1064 print_revision (PROGNAME, REVISION);
1065 printf
1066 ("Copyright (c) %s %s <%s>\n\n%s\n",
1067 COPYRIGHT, AUTHORS, EMAIL, SUMMARY);
1068 print_usage ();
1069 printf ("NOTE: One or both of -H and -I must be specified\n");
1070 printf ("\nOptions:\n" LONGOPTIONS "\n", HTTP_EXPECT, HTTP_PORT,
1071 DEFAULT_SOCKET_TIMEOUT, SSLOPTIONS);
1072 #ifdef HAVE_SSL
1073 printf (SSLDESCRIPTION);
1074 #endif
1075 }
1078 void
1079 print_usage (void)
1080 {
1081 printf ("Usage:\n" " %s %s\n"
1082 #ifdef HAVE_GETOPT_H
1083 " %s (-h | --help) for detailed help\n"
1084 " %s (-V | --version) for version information\n",
1085 #else
1086 " %s -h for detailed help\n"
1087 " %s -V for version information\n",
1088 #endif
1089 PROGNAME, OPTIONS, PROGNAME, PROGNAME);
1090 }