a43b993be87b171cac6e03d925abf4bafc724b1b
1 /******************************************************************************
3 This program is free software; you can redistribute it and/or modify
4 it under the terms of the GNU General Public License as published by
5 the Free Software Foundation; either version 2 of the License, or
6 (at your option) any later version.
8 This program is distributed in the hope that it will be useful,
9 but WITHOUT ANY WARRANTY; without even the implied warranty of
10 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 GNU General Public License for more details.
13 You should have received a copy of the GNU General Public License
14 along with this program; if not, write to the Free Software
15 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
17 ******************************************************************************/
19 const char *progname = "check_smtp";
20 const char *revision = "$Revision$";
21 const char *copyright = "2000-2003";
22 const char *email = "nagiosplug-devel@lists.sourceforge.net";
24 #include "common.h"
25 #include "netutils.h"
26 #include "utils.h"
28 enum {
29 SMTP_PORT = 25
30 };
31 const char *SMTP_EXPECT = "220";
32 const char *SMTP_HELO = "HELO ";
33 const char *SMTP_QUIT = "QUIT\r\n";
35 int process_arguments (int, char **);
36 int validate_arguments (void);
37 void print_help (void);
38 void print_usage (void);
40 #ifdef HAVE_REGEX_H
41 #include <regex.h>
42 char regex_expect[MAX_INPUT_BUFFER] = "";
43 regex_t preg;
44 regmatch_t pmatch[10];
45 char timestamp[10] = "";
46 char errbuf[MAX_INPUT_BUFFER];
47 int cflags = REG_EXTENDED | REG_NOSUB | REG_NEWLINE;
48 int eflags = 0;
49 int errcode, excode;
50 #endif
52 int server_port = SMTP_PORT;
53 char *server_address = NULL;
54 char *server_expect = NULL;
55 int smtp_use_dummycmd = 0;
56 char *mail_command = NULL;
57 char *from_arg = NULL;
58 int ncommands=0;
59 int command_size=0;
60 int nresponses=0;
61 int response_size=0;
62 char **commands = NULL;
63 char **responses = NULL;
64 int warning_time = 0;
65 int check_warning_time = FALSE;
66 int critical_time = 0;
67 int check_critical_time = FALSE;
68 int verbose = 0;
74 \f
75 int
76 main (int argc, char **argv)
77 {
78 int sd;
79 int n = 0;
80 double elapsed_time;
81 long microsec;
82 int result = STATE_UNKNOWN;
83 char buffer[MAX_INPUT_BUFFER];
84 char *cmd_str = NULL;
85 char *helocmd = NULL;
86 struct timeval tv;
88 setlocale (LC_ALL, "");
89 bindtextdomain (PACKAGE, LOCALEDIR);
90 textdomain (PACKAGE);
92 if (process_arguments (argc, argv) != OK)
93 usage (_("Invalid command arguments supplied\n"));
95 /* initialize the HELO command with the localhostname */
96 #ifndef HOST_MAX_BYTES
97 #define HOST_MAX_BYTES 255
98 #endif
99 helocmd = malloc (HOST_MAX_BYTES);
100 gethostname(helocmd, HOST_MAX_BYTES);
101 asprintf (&helocmd, "%s%s%s", SMTP_HELO, helocmd, "\r\n");
103 /* initialize the MAIL command with optional FROM command */
104 asprintf (&cmd_str, "%sFROM: %s%s", mail_command, from_arg, "\r\n");
106 if (verbose && smtp_use_dummycmd)
107 printf ("FROM CMD: %s", cmd_str);
109 /* initialize alarm signal handling */
110 (void) signal (SIGALRM, socket_timeout_alarm_handler);
112 /* set socket timeout */
113 (void) alarm (socket_timeout);
115 /* start timer */
116 gettimeofday (&tv, NULL);
118 /* try to connect to the host at the given port number */
119 result = my_tcp_connect (server_address, server_port, &sd);
121 if (result == STATE_OK) { /* we connected */
123 /* watch for the SMTP connection string and */
124 /* return a WARNING status if we couldn't read any data */
125 if (recv (sd, buffer, MAX_INPUT_BUFFER - 1, 0) == -1) {
126 printf (_("recv() failed\n"));
127 result = STATE_WARNING;
128 }
129 else {
130 if (verbose)
131 printf ("%s", buffer);
132 /* strip the buffer of carriage returns */
133 strip (buffer);
134 /* make sure we find the response we are looking for */
135 if (!strstr (buffer, server_expect)) {
136 if (server_port == SMTP_PORT)
137 printf (_("Invalid SMTP response received from host\n"));
138 else
139 printf (_("Invalid SMTP response received from host on port %d\n"),
140 server_port);
141 result = STATE_WARNING;
142 }
143 }
145 /* send the HELO command */
146 send(sd, helocmd, strlen(helocmd), 0);
148 /* allow for response to helo command to reach us */
149 recv(sd, buffer, MAX_INPUT_BUFFER-1, 0);
151 /* sendmail will syslog a "NOQUEUE" error if session does not attempt
152 * to do something useful. This can be prevented by giving a command
153 * even if syntax is illegal (MAIL requires a FROM:<...> argument)
154 *
155 * According to rfc821 you can include a null reversepath in the from command
156 * - but a log message is generated on the smtp server.
157 *
158 * You can disable sending mail_command with '--nocommand'
159 * Use the -f option to provide a FROM address
160 */
161 if (smtp_use_dummycmd) {
162 send(sd, cmd_str, strlen(cmd_str), 0);
163 recv(sd, buffer, MAX_INPUT_BUFFER-1, 0);
164 if (verbose)
165 printf("%s", buffer);
166 }
168 while (n < ncommands) {
169 asprintf (&cmd_str, "%s%s", commands[n], "\r\n");
170 send(sd, cmd_str, strlen(cmd_str), 0);
171 recv(sd, buffer, MAX_INPUT_BUFFER-1, 0);
172 if (verbose)
173 printf("%s", buffer);
174 strip (buffer);
175 if (n < nresponses) {
176 #ifdef HAVE_REGEX_H
177 cflags |= REG_EXTENDED | REG_NOSUB | REG_NEWLINE;
178 //strncpy (regex_expect, responses[n], sizeof (regex_expect) - 1);
179 //regex_expect[sizeof (regex_expect) - 1] = '\0';
180 errcode = regcomp (&preg, responses[n], cflags);
181 if (errcode != 0) {
182 regerror (errcode, &preg, errbuf, MAX_INPUT_BUFFER);
183 printf (_("Could Not Compile Regular Expression"));
184 return ERROR;
185 }
186 excode = regexec (&preg, buffer, 10, pmatch, eflags);
187 if (excode == 0) {
188 result = STATE_OK;
189 }
190 else if (excode == REG_NOMATCH) {
191 result = STATE_WARNING;
192 printf (_("SMTP %s - Invalid response '%s' to command '%s'\n"), state_text (result), buffer, commands[n]);
193 }
194 else {
195 regerror (excode, &preg, errbuf, MAX_INPUT_BUFFER);
196 printf (_("Execute Error: %s\n"), errbuf);
197 result = STATE_UNKNOWN;
198 }
199 #else
200 if (strstr(buffer, responses[n])!=buffer) {
201 result = STATE_WARNING;
202 printf (_("SMTP %s - Invalid response '%s' to command '%s'\n"), state_text (result), buffer, commands[n]);
203 }
204 #endif
205 }
206 n++;
207 }
209 /* tell the server we're done */
210 send (sd, SMTP_QUIT, strlen (SMTP_QUIT), 0);
212 /* finally close the connection */
213 close (sd);
214 }
216 /* reset the alarm */
217 alarm (0);
219 microsec = deltime (tv);
220 elapsed_time = (double)microsec / 1.0e6;
222 if (result == STATE_OK)
223 if (check_critical_time && elapsed_time > (double) critical_time)
224 result = STATE_CRITICAL;
225 else if (check_warning_time && elapsed_time > (double) warning_time)
226 result = STATE_WARNING;
228 printf (_("SMTP %s - %.3f sec. response time%s%s|%s\n"),
229 state_text (result), elapsed_time,
230 verbose?", ":"", verbose?buffer:"",
231 fperfdata ("time", elapsed_time, "s",
232 (int)check_warning_time, warning_time,
233 (int)check_critical_time, critical_time,
234 TRUE, 0, FALSE, 0));
236 return result;
237 }
243 \f
244 /* process command-line arguments */
245 int
246 process_arguments (int argc, char **argv)
247 {
248 int c;
250 int option = 0;
251 static struct option longopts[] = {
252 {"hostname", required_argument, 0, 'H'},
253 {"expect", required_argument, 0, 'e'},
254 {"critical", required_argument, 0, 'c'},
255 {"warning", required_argument, 0, 'w'},
256 {"timeout", required_argument, 0, 't'},
257 {"port", required_argument, 0, 'p'},
258 {"from", required_argument, 0, 'f'},
259 {"command", required_argument, 0, 'C'},
260 {"response", required_argument, 0, 'R'},
261 {"nocommand", required_argument, 0, 'n'},
262 {"verbose", no_argument, 0, 'v'},
263 {"version", no_argument, 0, 'V'},
264 {"use-ipv4", no_argument, 0, '4'},
265 {"use-ipv6", no_argument, 0, '6'},
266 {"help", no_argument, 0, 'h'},
267 {0, 0, 0, 0}
268 };
270 if (argc < 2)
271 return ERROR;
273 for (c = 1; c < argc; c++) {
274 if (strcmp ("-to", argv[c]) == 0)
275 strcpy (argv[c], "-t");
276 else if (strcmp ("-wt", argv[c]) == 0)
277 strcpy (argv[c], "-w");
278 else if (strcmp ("-ct", argv[c]) == 0)
279 strcpy (argv[c], "-c");
280 }
282 while (1) {
283 c = getopt_long (argc, argv, "+hVv46t:p:f:e:c:w:H:C:R:",
284 longopts, &option);
286 if (c == -1 || c == EOF)
287 break;
289 switch (c) {
290 case 'H': /* hostname */
291 if (is_host (optarg)) {
292 server_address = optarg;
293 }
294 else {
295 usage (_("Invalid host name\n"));
296 }
297 break;
298 case 'p': /* port */
299 if (is_intpos (optarg))
300 server_port = atoi (optarg);
301 else
302 usage (_("Server port must be a positive integer\n"));
303 break;
304 case 'f': /* from argument */
305 from_arg = optarg;
306 smtp_use_dummycmd = 1;
307 break;
308 case 'e': /* server expect string on 220 */
309 server_expect = optarg;
310 break;
311 case 'C': /* commands */
312 if (ncommands >= command_size) {
313 commands = realloc (commands, command_size+8);
314 if (commands == NULL)
315 die (STATE_UNKNOWN,
316 _("Could not realloc() units [%d]\n"), ncommands);
317 }
318 commands[ncommands] = optarg;
319 ncommands++;
320 break;
321 case 'R': /* server responses */
322 if (nresponses >= response_size) {
323 responses = realloc (responses, response_size+8);
324 if (responses == NULL)
325 die (STATE_UNKNOWN,
326 _("Could not realloc() units [%d]\n"), nresponses);
327 }
328 responses[nresponses] = optarg;
329 nresponses++;
330 break;
331 case 'c': /* critical time threshold */
332 if (is_intnonneg (optarg)) {
333 critical_time = atoi (optarg);
334 check_critical_time = TRUE;
335 }
336 else {
337 usage (_("Critical time must be a nonnegative integer\n"));
338 }
339 break;
340 case 'w': /* warning time threshold */
341 if (is_intnonneg (optarg)) {
342 warning_time = atoi (optarg);
343 check_warning_time = TRUE;
344 }
345 else {
346 usage (_("Warning time must be a nonnegative integer\n"));
347 }
348 break;
349 case 'v': /* verbose */
350 verbose++;
351 break;
352 case 't': /* timeout */
353 if (is_intnonneg (optarg)) {
354 socket_timeout = atoi (optarg);
355 }
356 else {
357 usage (_("Time interval must be a nonnegative integer\n"));
358 }
359 break;
360 case '4':
361 address_family = AF_INET;
362 break;
363 case '6':
364 #ifdef USE_IPV6
365 address_family = AF_INET6;
366 #else
367 usage (_("IPv6 support not available\n"));
368 #endif
369 break;
370 case 'V': /* version */
371 print_revision (progname, revision);
372 exit (STATE_OK);
373 case 'h': /* help */
374 print_help ();
375 exit (STATE_OK);
376 case '?': /* help */
377 usage (_("Invalid argument\n"));
378 }
379 }
381 c = optind;
382 if (server_address == NULL) {
383 if (argv[c]) {
384 if (is_host (argv[c]))
385 server_address = argv[c];
386 else
387 usage (_("Invalid host name"));
388 }
389 else {
390 asprintf (&server_address, "127.0.0.1");
391 }
392 }
394 if (server_expect == NULL)
395 server_expect = strdup (SMTP_EXPECT);
397 if (mail_command == NULL)
398 mail_command = strdup("MAIL ");
400 if (from_arg==NULL)
401 from_arg = strdup(" ");
403 return validate_arguments ();
404 }
410 int
411 validate_arguments (void)
412 {
413 return OK;
414 }
420 \f
421 void
422 print_help (void)
423 {
424 char *myport;
425 asprintf (&myport, "%d", SMTP_PORT);
427 print_revision (progname, revision);
429 printf (_("Copyright (c) 1999-2001 Ethan Galstad <nagios@nagios.org>\n"));
430 printf (_(COPYRIGHT), copyright, email);
432 printf(_("\
433 This plugin will attempt to open an SMTP connection with the host.\n\n"));
435 print_usage ();
437 printf (_(UT_HELP_VRSN));
439 printf (_(UT_HOST_PORT), 'p', myport);
441 printf (_(UT_IPv46));
443 printf (_("\
444 -e, --expect=STRING\n\
445 String to expect in first line of server response (default: '%s')\n\
446 -n, nocommand\n\
447 Suppress SMTP command\n\
448 -C, --command=STRING\n\
449 SMTP command (may be used repeatedly)\n\
450 -R, --command=STRING\n\
451 Expected response to command (may be used repeatedly)\n\
452 -f, --from=STRING\n\
453 FROM-address to include in MAIL command, required by Exchange 2000\n"),
454 SMTP_EXPECT);
456 printf (_(UT_WARN_CRIT));
458 printf (_(UT_TIMEOUT), DEFAULT_SOCKET_TIMEOUT);
460 printf (_(UT_VERBOSE));
462 printf(_("\n\
463 Successul connects return STATE_OK, refusals and timeouts return\n\
464 STATE_CRITICAL, other errors return STATE_UNKNOWN. Successful\n\
465 connects, but incorrect reponse messages from the host result in\n\
466 STATE_WARNING return values.\n"));
468 printf (_(UT_SUPPORT));
469 }
475 void
476 print_usage (void)
477 {
478 printf ("\
479 Usage: %s -H host [-p port] [-e expect] [-C command] [-f from addr]\n\
480 [-w warn] [-c crit] [-t timeout] [-n] [-v] [-4|-6]\n", progname);
481 printf (_(UT_HLP_VRS), progname, progname);
482 }