1 /*****************************************************************************
2 *
3 * Nagios check_smtp plugin
4 *
5 * License: GPL
6 * Copyright (c) 2000-2007 Nagios Plugins Development Team
7 *
8 * Description:
9 *
10 * This file contains the check_smtp plugin
11 *
12 * This plugin will attempt to open an SMTP connection with the host.
13 *
14 *
15 * This program is free software: you can redistribute it and/or modify
16 * it under the terms of the GNU General Public License as published by
17 * the Free Software Foundation, either version 3 of the License, or
18 * (at your option) any later version.
19 *
20 * This program is distributed in the hope that it will be useful,
21 * but WITHOUT ANY WARRANTY; without even the implied warranty of
22 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
23 * GNU General Public License for more details.
24 *
25 * You should have received a copy of the GNU General Public License
26 * along with this program. If not, see <http://www.gnu.org/licenses/>.
27 *
28 *
29 *****************************************************************************/
31 const char *progname = "check_smtp";
32 const char *copyright = "2000-2007";
33 const char *email = "nagiosplug-devel@lists.sourceforge.net";
35 #include "common.h"
36 #include "netutils.h"
37 #include "utils.h"
38 #include "base64.h"
40 #include <ctype.h>
42 #ifdef HAVE_SSL
43 int check_cert = FALSE;
44 int days_till_exp;
45 # define my_recv(buf, len) ((use_ssl && ssl_established) ? np_net_ssl_read(buf, len) : read(sd, buf, len))
46 # define my_send(buf, len) ((use_ssl && ssl_established) ? np_net_ssl_write(buf, len) : send(sd, buf, len, 0))
47 #else /* ifndef HAVE_SSL */
48 # define my_recv(buf, len) read(sd, buf, len)
49 # define my_send(buf, len) send(sd, buf, len, 0)
50 #endif
52 enum {
53 SMTP_PORT = 25
54 };
55 #define SMTP_EXPECT "220"
56 #define SMTP_HELO "HELO "
57 #define SMTP_EHLO "EHLO "
58 #define SMTP_QUIT "QUIT\r\n"
59 #define SMTP_STARTTLS "STARTTLS\r\n"
60 #define SMTP_AUTH_LOGIN "AUTH LOGIN\r\n"
62 #ifndef HOST_MAX_BYTES
63 #define HOST_MAX_BYTES 255
64 #endif
66 #define EHLO_SUPPORTS_STARTTLS 1
68 int process_arguments (int, char **);
69 int validate_arguments (void);
70 void print_help (void);
71 void print_usage (void);
72 void smtp_quit(void);
73 int recvline(char *, size_t);
74 int recvlines(char *, size_t);
75 int my_close(void);
77 #include "regex.h"
78 char regex_expect[MAX_INPUT_BUFFER] = "";
79 regex_t preg;
80 regmatch_t pmatch[10];
81 char timestamp[20] = "";
82 char errbuf[MAX_INPUT_BUFFER];
83 int cflags = REG_EXTENDED | REG_NOSUB | REG_NEWLINE;
84 int eflags = 0;
85 int errcode, excode;
87 int server_port = SMTP_PORT;
88 char *server_address = NULL;
89 char *server_expect = NULL;
90 int smtp_use_dummycmd = 0;
91 char *mail_command = NULL;
92 char *from_arg = NULL;
93 int ncommands=0;
94 int command_size=0;
95 int nresponses=0;
96 int response_size=0;
97 char **commands = NULL;
98 char **responses = NULL;
99 char *authtype = NULL;
100 char *authuser = NULL;
101 char *authpass = NULL;
102 int warning_time = 0;
103 int check_warning_time = FALSE;
104 int critical_time = 0;
105 int check_critical_time = FALSE;
106 int verbose = 0;
107 int use_ssl = FALSE;
108 short use_ehlo = FALSE;
109 short ssl_established = 0;
110 char *localhostname = NULL;
111 int sd;
112 char buffer[MAX_INPUT_BUFFER];
113 enum {
114 TCP_PROTOCOL = 1,
115 UDP_PROTOCOL = 2,
116 };
119 int
120 main (int argc, char **argv)
121 {
122 short supports_tls=FALSE;
123 int n = 0;
124 double elapsed_time;
125 long microsec;
126 int result = STATE_UNKNOWN;
127 char *cmd_str = NULL;
128 char *helocmd = NULL;
129 char *error_msg = "";
130 struct timeval tv;
132 setlocale (LC_ALL, "");
133 bindtextdomain (PACKAGE, LOCALEDIR);
134 textdomain (PACKAGE);
136 /* Parse extra opts if any */
137 argv=np_extra_opts (&argc, argv, progname);
139 if (process_arguments (argc, argv) == ERROR)
140 usage4 (_("Could not parse arguments"));
142 /* If localhostname not set on command line, use gethostname to set */
143 if(! localhostname){
144 localhostname = malloc (HOST_MAX_BYTES);
145 if(!localhostname){
146 printf(_("malloc() failed!\n"));
147 return STATE_CRITICAL;
148 }
149 if(gethostname(localhostname, HOST_MAX_BYTES)){
150 printf(_("gethostname() failed!\n"));
151 return STATE_CRITICAL;
152 }
153 }
154 if(use_ehlo)
155 asprintf (&helocmd, "%s%s%s", SMTP_EHLO, localhostname, "\r\n");
156 else
157 asprintf (&helocmd, "%s%s%s", SMTP_HELO, localhostname, "\r\n");
159 if (verbose)
160 printf("HELOCMD: %s", helocmd);
162 /* initialize the MAIL command with optional FROM command */
163 asprintf (&cmd_str, "%sFROM: %s%s", mail_command, from_arg, "\r\n");
165 if (verbose && smtp_use_dummycmd)
166 printf ("FROM CMD: %s", cmd_str);
168 /* initialize alarm signal handling */
169 (void) signal (SIGALRM, socket_timeout_alarm_handler);
171 /* set socket timeout */
172 (void) alarm (socket_timeout);
174 /* start timer */
175 gettimeofday (&tv, NULL);
177 /* try to connect to the host at the given port number */
178 result = my_tcp_connect (server_address, server_port, &sd);
180 if (result == STATE_OK) { /* we connected */
182 /* watch for the SMTP connection string and */
183 /* return a WARNING status if we couldn't read any data */
184 if (recvlines(buffer, MAX_INPUT_BUFFER) <= 0) {
185 printf (_("recv() failed\n"));
186 result = STATE_WARNING;
187 }
188 else {
189 if (verbose)
190 printf ("%s", buffer);
191 /* strip the buffer of carriage returns */
192 strip (buffer);
193 /* make sure we find the response we are looking for */
194 if (!strstr (buffer, server_expect)) {
195 if (server_port == SMTP_PORT)
196 printf (_("Invalid SMTP response received from host: %s\n"), buffer);
197 else
198 printf (_("Invalid SMTP response received from host on port %d: %s\n"),
199 server_port, buffer);
200 result = STATE_WARNING;
201 }
202 }
204 /* send the HELO/EHLO command */
205 send(sd, helocmd, strlen(helocmd), 0);
207 /* allow for response to helo command to reach us */
208 if (recvlines(buffer, MAX_INPUT_BUFFER) <= 0) {
209 printf (_("recv() failed\n"));
210 return STATE_WARNING;
211 } else if(use_ehlo){
212 if(strstr(buffer, "250 STARTTLS") != NULL ||
213 strstr(buffer, "250-STARTTLS") != NULL){
214 supports_tls=TRUE;
215 }
216 }
218 if(use_ssl && ! supports_tls){
219 printf(_("WARNING - TLS not supported by server\n"));
220 smtp_quit();
221 return STATE_WARNING;
222 }
224 #ifdef HAVE_SSL
225 if(use_ssl) {
226 /* send the STARTTLS command */
227 send(sd, SMTP_STARTTLS, strlen(SMTP_STARTTLS), 0);
229 recvlines(buffer, MAX_INPUT_BUFFER); /* wait for it */
230 if (!strstr (buffer, server_expect)) {
231 printf (_("Server does not support STARTTLS\n"));
232 smtp_quit();
233 return STATE_UNKNOWN;
234 }
235 result = np_net_ssl_init(sd);
236 if(result != STATE_OK) {
237 printf (_("CRITICAL - Cannot create SSL context.\n"));
238 np_net_ssl_cleanup();
239 close(sd);
240 return STATE_CRITICAL;
241 } else {
242 ssl_established = 1;
243 }
245 /*
246 * Resend the EHLO command.
247 *
248 * RFC 3207 (4.2) says: ``The client MUST discard any knowledge
249 * obtained from the server, such as the list of SMTP service
250 * extensions, which was not obtained from the TLS negotiation
251 * itself. The client SHOULD send an EHLO command as the first
252 * command after a successful TLS negotiation.'' For this
253 * reason, some MTAs will not allow an AUTH LOGIN command before
254 * we resent EHLO via TLS.
255 */
256 if (my_send(helocmd, strlen(helocmd)) <= 0) {
257 printf("%s\n", _("SMTP UNKNOWN - Cannot send EHLO command via TLS."));
258 my_close();
259 return STATE_UNKNOWN;
260 }
261 if (verbose)
262 printf(_("sent %s"), helocmd);
263 if ((n = recvlines(buffer, MAX_INPUT_BUFFER)) <= 0) {
264 printf("%s\n", _("SMTP UNKNOWN - Cannot read EHLO response via TLS."));
265 my_close();
266 return STATE_UNKNOWN;
267 }
268 if (verbose) {
269 printf("%s", buffer);
270 }
272 # ifdef USE_OPENSSL
273 if ( check_cert ) {
274 result = np_net_ssl_check_cert(days_till_exp);
275 if(result != STATE_OK){
276 printf ("%s\n", _("CRITICAL - Cannot retrieve server certificate."));
277 }
278 my_close();
279 return result;
280 }
281 # endif /* USE_OPENSSL */
282 }
283 #endif
285 /* sendmail will syslog a "NOQUEUE" error if session does not attempt
286 * to do something useful. This can be prevented by giving a command
287 * even if syntax is illegal (MAIL requires a FROM:<...> argument)
288 *
289 * According to rfc821 you can include a null reversepath in the from command
290 * - but a log message is generated on the smtp server.
291 *
292 * Use the -f option to provide a FROM address
293 */
294 if (smtp_use_dummycmd) {
295 my_send(cmd_str, strlen(cmd_str));
296 if (recvlines(buffer, MAX_INPUT_BUFFER) >= 1 && verbose)
297 printf("%s", buffer);
298 }
300 while (n < ncommands) {
301 asprintf (&cmd_str, "%s%s", commands[n], "\r\n");
302 my_send(cmd_str, strlen(cmd_str));
303 if (recvlines(buffer, MAX_INPUT_BUFFER) >= 1 && verbose)
304 printf("%s", buffer);
305 strip (buffer);
306 if (n < nresponses) {
307 cflags |= REG_EXTENDED | REG_NOSUB | REG_NEWLINE;
308 errcode = regcomp (&preg, responses[n], cflags);
309 if (errcode != 0) {
310 regerror (errcode, &preg, errbuf, MAX_INPUT_BUFFER);
311 printf (_("Could Not Compile Regular Expression"));
312 return ERROR;
313 }
314 excode = regexec (&preg, buffer, 10, pmatch, eflags);
315 if (excode == 0) {
316 result = STATE_OK;
317 }
318 else if (excode == REG_NOMATCH) {
319 result = STATE_WARNING;
320 printf (_("SMTP %s - Invalid response '%s' to command '%s'\n"), state_text (result), buffer, commands[n]);
321 }
322 else {
323 regerror (excode, &preg, errbuf, MAX_INPUT_BUFFER);
324 printf (_("Execute Error: %s\n"), errbuf);
325 result = STATE_UNKNOWN;
326 }
327 }
328 n++;
329 }
331 if (authtype != NULL) {
332 if (strcmp (authtype, "LOGIN") == 0) {
333 char *abuf;
334 int ret;
335 do {
336 if (authuser == NULL) {
337 result = STATE_CRITICAL;
338 asprintf(&error_msg, _("no authuser specified, "));
339 break;
340 }
341 if (authpass == NULL) {
342 result = STATE_CRITICAL;
343 asprintf(&error_msg, _("no authpass specified, "));
344 break;
345 }
347 /* send AUTH LOGIN */
348 my_send(SMTP_AUTH_LOGIN, strlen(SMTP_AUTH_LOGIN));
349 if (verbose)
350 printf (_("sent %s\n"), "AUTH LOGIN");
352 if ((ret = recvlines(buffer, MAX_INPUT_BUFFER)) <= 0) {
353 asprintf(&error_msg, _("recv() failed after AUTH LOGIN, "));
354 result = STATE_WARNING;
355 break;
356 }
357 if (verbose)
358 printf (_("received %s\n"), buffer);
360 if (strncmp (buffer, "334", 3) != 0) {
361 result = STATE_CRITICAL;
362 asprintf(&error_msg, _("invalid response received after AUTH LOGIN, "));
363 break;
364 }
366 /* encode authuser with base64 */
367 base64_encode_alloc (authuser, strlen(authuser), &abuf);
368 /* FIXME: abuf shouldn't have enough space to strcat a '\r\n' into it. */
369 strcat (abuf, "\r\n");
370 my_send(abuf, strlen(abuf));
371 if (verbose)
372 printf (_("sent %s\n"), abuf);
374 if ((ret = recvlines(buffer, MAX_INPUT_BUFFER)) <= 0) {
375 result = STATE_CRITICAL;
376 asprintf(&error_msg, _("recv() failed after sending authuser, "));
377 break;
378 }
379 if (verbose) {
380 printf (_("received %s\n"), buffer);
381 }
382 if (strncmp (buffer, "334", 3) != 0) {
383 result = STATE_CRITICAL;
384 asprintf(&error_msg, _("invalid response received after authuser, "));
385 break;
386 }
387 /* encode authpass with base64 */
388 base64_encode_alloc (authpass, strlen(authpass), &abuf);
389 /* FIXME: abuf shouldn't have enough space to strcat a '\r\n' into it. */
390 strcat (abuf, "\r\n");
391 my_send(abuf, strlen(abuf));
392 if (verbose) {
393 printf (_("sent %s\n"), abuf);
394 }
395 if ((ret = recvlines(buffer, MAX_INPUT_BUFFER)) <= 0) {
396 result = STATE_CRITICAL;
397 asprintf(&error_msg, _("recv() failed after sending authpass, "));
398 break;
399 }
400 if (verbose) {
401 printf (_("received %s\n"), buffer);
402 }
403 if (strncmp (buffer, "235", 3) != 0) {
404 result = STATE_CRITICAL;
405 asprintf(&error_msg, _("invalid response received after authpass, "));
406 break;
407 }
408 break;
409 } while (0);
410 } else {
411 result = STATE_CRITICAL;
412 asprintf(&error_msg, _("only authtype LOGIN is supported, "));
413 }
414 }
416 /* tell the server we're done */
417 smtp_quit();
419 /* finally close the connection */
420 close (sd);
421 }
423 /* reset the alarm */
424 alarm (0);
426 microsec = deltime (tv);
427 elapsed_time = (double)microsec / 1.0e6;
429 if (result == STATE_OK) {
430 if (check_critical_time && elapsed_time > (double) critical_time)
431 result = STATE_CRITICAL;
432 else if (check_warning_time && elapsed_time > (double) warning_time)
433 result = STATE_WARNING;
434 }
436 printf (_("SMTP %s - %s%.3f sec. response time%s%s|%s\n"),
437 state_text (result),
438 error_msg,
439 elapsed_time,
440 verbose?", ":"", verbose?buffer:"",
441 fperfdata ("time", elapsed_time, "s",
442 (int)check_warning_time, warning_time,
443 (int)check_critical_time, critical_time,
444 TRUE, 0, FALSE, 0));
446 return result;
447 }
451 /* process command-line arguments */
452 int
453 process_arguments (int argc, char **argv)
454 {
455 int c;
457 int option = 0;
458 static struct option longopts[] = {
459 {"hostname", required_argument, 0, 'H'},
460 {"expect", required_argument, 0, 'e'},
461 {"critical", required_argument, 0, 'c'},
462 {"warning", required_argument, 0, 'w'},
463 {"timeout", required_argument, 0, 't'},
464 {"port", required_argument, 0, 'p'},
465 {"from", required_argument, 0, 'f'},
466 {"fqdn", required_argument, 0, 'F'},
467 {"authtype", required_argument, 0, 'A'},
468 {"authuser", required_argument, 0, 'U'},
469 {"authpass", required_argument, 0, 'P'},
470 {"command", required_argument, 0, 'C'},
471 {"response", required_argument, 0, 'R'},
472 {"verbose", no_argument, 0, 'v'},
473 {"version", no_argument, 0, 'V'},
474 {"use-ipv4", no_argument, 0, '4'},
475 {"use-ipv6", no_argument, 0, '6'},
476 {"help", no_argument, 0, 'h'},
477 {"starttls",no_argument,0,'S'},
478 {"certificate",required_argument,0,'D'},
479 {0, 0, 0, 0}
480 };
482 if (argc < 2)
483 return ERROR;
485 for (c = 1; c < argc; c++) {
486 if (strcmp ("-to", argv[c]) == 0)
487 strcpy (argv[c], "-t");
488 else if (strcmp ("-wt", argv[c]) == 0)
489 strcpy (argv[c], "-w");
490 else if (strcmp ("-ct", argv[c]) == 0)
491 strcpy (argv[c], "-c");
492 }
494 while (1) {
495 c = getopt_long (argc, argv, "+hVv46t:p:f:e:c:w:H:C:R:SD:F:A:U:P:",
496 longopts, &option);
498 if (c == -1 || c == EOF)
499 break;
501 switch (c) {
502 case 'H': /* hostname */
503 if (is_host (optarg)) {
504 server_address = optarg;
505 }
506 else {
507 usage2 (_("Invalid hostname/address"), optarg);
508 }
509 break;
510 case 'p': /* port */
511 if (is_intpos (optarg))
512 server_port = atoi (optarg);
513 else
514 usage4 (_("Port must be a positive integer"));
515 break;
516 case 'F':
517 /* localhostname */
518 localhostname = strdup(optarg);
519 break;
520 case 'f': /* from argument */
521 from_arg = optarg;
522 smtp_use_dummycmd = 1;
523 break;
524 case 'A':
525 authtype = optarg;
526 use_ehlo = TRUE;
527 break;
528 case 'U':
529 authuser = optarg;
530 break;
531 case 'P':
532 authpass = optarg;
533 break;
534 case 'e': /* server expect string on 220 */
535 server_expect = optarg;
536 break;
537 case 'C': /* commands */
538 if (ncommands >= command_size) {
539 command_size+=8;
540 commands = realloc (commands, sizeof(char *) * command_size);
541 if (commands == NULL)
542 die (STATE_UNKNOWN,
543 _("Could not realloc() units [%d]\n"), ncommands);
544 }
545 commands[ncommands] = (char *) malloc (sizeof(char) * 255);
546 strncpy (commands[ncommands], optarg, 255);
547 ncommands++;
548 break;
549 case 'R': /* server responses */
550 if (nresponses >= response_size) {
551 response_size += 8;
552 responses = realloc (responses, sizeof(char *) * response_size);
553 if (responses == NULL)
554 die (STATE_UNKNOWN,
555 _("Could not realloc() units [%d]\n"), nresponses);
556 }
557 responses[nresponses] = (char *) malloc (sizeof(char) * 255);
558 strncpy (responses[nresponses], optarg, 255);
559 nresponses++;
560 break;
561 case 'c': /* critical time threshold */
562 if (is_intnonneg (optarg)) {
563 critical_time = atoi (optarg);
564 check_critical_time = TRUE;
565 }
566 else {
567 usage4 (_("Critical time must be a positive integer"));
568 }
569 break;
570 case 'w': /* warning time threshold */
571 if (is_intnonneg (optarg)) {
572 warning_time = atoi (optarg);
573 check_warning_time = TRUE;
574 }
575 else {
576 usage4 (_("Warning time must be a positive integer"));
577 }
578 break;
579 case 'v': /* verbose */
580 verbose++;
581 break;
582 case 't': /* timeout */
583 if (is_intnonneg (optarg)) {
584 socket_timeout = atoi (optarg);
585 }
586 else {
587 usage4 (_("Timeout interval must be a positive integer"));
588 }
589 break;
590 case 'S':
591 /* starttls */
592 use_ssl = TRUE;
593 use_ehlo = TRUE;
594 break;
595 case 'D':
596 /* Check SSL cert validity */
597 #ifdef USE_OPENSSL
598 if (!is_intnonneg (optarg))
599 usage2 ("Invalid certificate expiration period",optarg);
600 days_till_exp = atoi (optarg);
601 check_cert = TRUE;
602 #else
603 usage (_("SSL support not available - install OpenSSL and recompile"));
604 #endif
605 break;
606 case '4':
607 address_family = AF_INET;
608 break;
609 case '6':
610 #ifdef USE_IPV6
611 address_family = AF_INET6;
612 #else
613 usage4 (_("IPv6 support not available"));
614 #endif
615 break;
616 case 'V': /* version */
617 print_revision (progname, NP_VERSION);
618 exit (STATE_OK);
619 case 'h': /* help */
620 print_help ();
621 exit (STATE_OK);
622 case '?': /* help */
623 usage5 ();
624 }
625 }
627 c = optind;
628 if (server_address == NULL) {
629 if (argv[c]) {
630 if (is_host (argv[c]))
631 server_address = argv[c];
632 else
633 usage2 (_("Invalid hostname/address"), argv[c]);
634 }
635 else {
636 asprintf (&server_address, "127.0.0.1");
637 }
638 }
640 if (server_expect == NULL)
641 server_expect = strdup (SMTP_EXPECT);
643 if (mail_command == NULL)
644 mail_command = strdup("MAIL ");
646 if (from_arg==NULL)
647 from_arg = strdup(" ");
649 return validate_arguments ();
650 }
654 int
655 validate_arguments (void)
656 {
657 return OK;
658 }
661 void
662 smtp_quit(void)
663 {
664 int bytes;
666 my_send(SMTP_QUIT, strlen(SMTP_QUIT));
667 if (verbose)
668 printf(_("sent %s\n"), "QUIT");
670 /* read the response but don't care about problems */
671 bytes = recvlines(buffer, MAX_INPUT_BUFFER);
672 if (verbose) {
673 if (bytes < 0)
674 printf(_("recv() failed after QUIT."));
675 else if (bytes == 0)
676 printf(_("Connection reset by peer."));
677 else {
678 buffer[bytes] = '\0';
679 printf(_("received %s\n"), buffer);
680 }
681 }
682 }
685 /*
686 * Receive one line, copy it into buf and nul-terminate it. Returns the
687 * number of bytes written to buf (excluding the '\0') or 0 on EOF or <0 on
688 * error.
689 *
690 * TODO: Reading one byte at a time is very inefficient. Replace this by a
691 * function which buffers the data, move that to netutils.c and change
692 * check_smtp and other plugins to use that. Also, remove (\r)\n.
693 */
694 int
695 recvline(char *buf, size_t bufsize)
696 {
697 int result;
698 unsigned i;
700 for (i = result = 0; i < bufsize - 1; i++) {
701 if ((result = my_recv(&buf[i], 1)) != 1)
702 break;
703 if (buf[i] == '\n') {
704 buf[++i] = '\0';
705 return i;
706 }
707 }
708 return (result == 1 || i == 0) ? -2 : result; /* -2 if out of space */
709 }
712 /*
713 * Receive one or more lines, copy them into buf and nul-terminate it. Returns
714 * the number of bytes written to buf (excluding the '\0') or 0 on EOF or <0 on
715 * error. Works for all protocols which format multiline replies as follows:
716 *
717 * ``The format for multiline replies requires that every line, except the last,
718 * begin with the reply code, followed immediately by a hyphen, `-' (also known
719 * as minus), followed by text. The last line will begin with the reply code,
720 * followed immediately by <SP>, optionally some text, and <CRLF>. As noted
721 * above, servers SHOULD send the <SP> if subsequent text is not sent, but
722 * clients MUST be prepared for it to be omitted.'' (RFC 2821, 4.2.1)
723 *
724 * TODO: Move this to netutils.c. Also, remove \r and possibly the final \n.
725 */
726 int
727 recvlines(char *buf, size_t bufsize)
728 {
729 int result, i;
731 for (i = 0; /* forever */; i += result)
732 if (!((result = recvline(buf + i, bufsize - i)) > 3 &&
733 isdigit((int)buf[i]) &&
734 isdigit((int)buf[i + 1]) &&
735 isdigit((int)buf[i + 2]) &&
736 buf[i + 3] == '-'))
737 break;
739 return (result <= 0) ? result : result + i;
740 }
743 int
744 my_close (void)
745 {
746 #ifdef HAVE_SSL
747 np_net_ssl_cleanup();
748 #endif
749 return close(sd);
750 }
753 void
754 print_help (void)
755 {
756 char *myport;
757 asprintf (&myport, "%d", SMTP_PORT);
759 print_revision (progname, NP_VERSION);
761 printf ("Copyright (c) 1999-2001 Ethan Galstad <nagios@nagios.org>\n");
762 printf (COPYRIGHT, copyright, email);
764 printf("%s\n", _("This plugin will attempt to open an SMTP connection with the host."));
766 printf ("\n\n");
768 print_usage ();
770 printf (_(UT_HELP_VRSN));
771 printf (_(UT_EXTRA_OPTS));
773 printf (_(UT_HOST_PORT), 'p', myport);
775 printf (_(UT_IPv46));
777 printf (" %s\n", "-e, --expect=STRING");
778 printf (_(" String to expect in first line of server response (default: '%s')\n"), SMTP_EXPECT);
779 printf (" %s\n", "-C, --command=STRING");
780 printf (" %s\n", _("SMTP command (may be used repeatedly)"));
781 printf (" %s\n", "-R, --command=STRING");
782 printf (" %s\n", _("Expected response to command (may be used repeatedly)"));
783 printf (" %s\n", "-f, --from=STRING");
784 printf (" %s\n", _("FROM-address to include in MAIL command, required by Exchange 2000")),
785 #ifdef HAVE_SSL
786 printf (" %s\n", "-D, --certificate=INTEGER");
787 printf (" %s\n", _("Minimum number of days a certificate has to be valid."));
788 printf (" %s\n", "-S, --starttls");
789 printf (" %s\n", _("Use STARTTLS for the connection."));
790 #endif
792 printf (" %s\n", "-A, --authtype=STRING");
793 printf (" %s\n", _("SMTP AUTH type to check (default none, only LOGIN supported)"));
794 printf (" %s\n", "-U, --authuser=STRING");
795 printf (" %s\n", _("SMTP AUTH username"));
796 printf (" %s\n", "-P, --authpass=STRING");
797 printf (" %s\n", _("SMTP AUTH password"));
799 printf (_(UT_WARN_CRIT));
801 printf (_(UT_TIMEOUT), DEFAULT_SOCKET_TIMEOUT);
803 printf (_(UT_VERBOSE));
805 printf("\n");
806 printf ("%s\n", _("Successul connects return STATE_OK, refusals and timeouts return"));
807 printf ("%s\n", _("STATE_CRITICAL, other errors return STATE_UNKNOWN. Successful"));
808 printf ("%s\n", _("connects, but incorrect reponse messages from the host result in"));
809 printf ("%s\n", _("STATE_WARNING return values."));
811 #ifdef NP_EXTRA_OPTS
812 printf ("\n");
813 printf ("%s\n", _("Notes:"));
814 printf (_(UT_EXTRA_OPTS_NOTES));
815 #endif
817 printf (_(UT_SUPPORT));
818 }
822 void
823 print_usage (void)
824 {
825 printf (_("Usage:"));
826 printf ("%s -H host [-p port] [-e expect] [-C command] [-f from addr]", progname);
827 printf ("[-A authtype -U authuser -P authpass] [-w warn] [-c crit] [-t timeout]\n");
828 printf ("[-S] [-D days] [-v] [-4|-6]\n");
829 }