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more pedantic compiler warnings
[nagiosplug.git] / plugins / check_smtp.c
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 int server_port = SMTP_PORT;
41 char *server_address = NULL;
42 char *server_expect = NULL;
43 int smtp_use_dummycmd = 1;
44 char *mail_command;
45 char *from_arg;
46 int warning_time = 0;
47 int check_warning_time = FALSE;
48 int critical_time = 0;
49 int check_critical_time = FALSE;
50 int verbose = 0;
56 \f
57 int
58 main (int argc, char **argv)
59 {
60         int sd;
61         double elapsed_time;
62         int result = STATE_UNKNOWN;
63         char buffer[MAX_INPUT_BUFFER];
64         char *from_str = NULL;
65         char *helocmd = NULL;
66         struct timeval tv;
68         if (process_arguments (argc, argv) != OK)
69                 usage (_("Invalid command arguments supplied\n"));
71         /* initialize the HELO command with the localhostname */
72 #ifndef HOST_MAX_BYTES
73 #define HOST_MAX_BYTES 255
74 #endif
75         helocmd = malloc (HOST_MAX_BYTES);
76         gethostname(helocmd, HOST_MAX_BYTES);
77         asprintf (&helocmd, "%s%s%s", SMTP_HELO, helocmd, "\r\n");
79         /* initialize the MAIL command with optional FROM command  */
80         asprintf (&from_str, "%sFROM: %s%s", mail_command, from_arg, "\r\n");
82         if (verbose)
83                 printf ("FROMCMD: %s\n", from_str);
84         
85         /* initialize alarm signal handling */
86         (void) signal (SIGALRM, socket_timeout_alarm_handler);
88         /* set socket timeout */
89         (void) alarm (socket_timeout);
91         /* start timer */
92         gettimeofday (&tv, NULL);
94         /* try to connect to the host at the given port number */
95         result = my_tcp_connect (server_address, server_port, &sd);
97         /* we connected, so close connection before exiting */
98         if (result == STATE_OK) {
100                 /* watch for the SMTP connection string and */
101                 /* return a WARNING status if we couldn't read any data */
102                 if (recv (sd, buffer, MAX_INPUT_BUFFER - 1, 0) == -1) {
103                         printf (_("recv() failed\n"));
104                         result = STATE_WARNING;
105                 }
106                 else {
107                         /* strip the buffer of carriage returns */
108                         strip (buffer);
109                         /* make sure we find the response we are looking for */
110                         if (!strstr (buffer, server_expect)) {
111                                 if (server_port == SMTP_PORT)
112                                         printf (_("Invalid SMTP response received from host\n"));
113                                 else
114                                         printf (_("Invalid SMTP response received from host on port %d\n"),
115                                                                         server_port);
116                                 result = STATE_WARNING;
117                         }
118                 }
120                 /* send the HELO command */
121                 send(sd, helocmd, strlen(helocmd), 0);
123                 /* allow for response to helo command to reach us */
124                 recv(sd, buffer, MAX_INPUT_BUFFER-1, 0);
125                                 
126                 /* sendmail will syslog a "NOQUEUE" error if session does not attempt
127                  * to do something useful. This can be prevented by giving a command
128                  * even if syntax is illegal (MAIL requires a FROM:<...> argument)
129                  *
130                  * According to rfc821 you can include a null reversepath in the from command
131                  * - but a log message is generated on the smtp server.
132                  *
133                  * You can disable sending mail_command with '--nocommand'
134                  * Use the -f option to provide a FROM address
135                  */
136                 if (smtp_use_dummycmd) {
138                         send(sd, from_str, strlen(from_str), 0);
140                         /* allow for response to mail_command to reach us */
141                         recv(sd, buffer, MAX_INPUT_BUFFER-1, 0);
143                         if (verbose) 
144                                 printf(_("DUMMYCMD: %s\n%s\n"),from_str,buffer);
146                 } /* smtp_use_dummycmd */
148                 /* tell the server we're done */
149                 send (sd, SMTP_QUIT, strlen (SMTP_QUIT), 0);
151                 /* finally close the connection */
152                 close (sd);
153         }
155         /* reset the alarm */
156         alarm (0);
158         elapsed_time = delta_time (tv);
160         if (check_critical_time && elapsed_time > (double) critical_time)
161                 result = STATE_CRITICAL;
162         else if (check_warning_time && elapsed_time > (double) warning_time)
163                 result = STATE_WARNING;
165         if (verbose)
166                 printf (_("SMTP %s - %.3f sec. response time, %s|time=%.3f\n"),
167                         state_text (result), elapsed_time, buffer, elapsed_time);
168         else
169                 printf (_("SMTP %s - %.3f second response time|time=%.3f\n"),
170                         state_text (result), elapsed_time, elapsed_time);
172         return result;
179 \f
180 /* process command-line arguments */
181 int
182 process_arguments (int argc, char **argv)
184         int c;
186         int option_index = 0;
187         static struct option long_options[] = {
188                 {"hostname", required_argument, 0, 'H'},
189                 {"expect", required_argument, 0, 'e'},
190                 {"critical", required_argument, 0, 'c'},
191                 {"warning", required_argument, 0, 'w'},
192                 {"timeout", required_argument, 0, 't'},
193                 {"port", required_argument, 0, 'p'},
194                 {"from", required_argument, 0, 'f'},
195                 {"command", required_argument, 0, 'C'},
196                 {"nocommand", required_argument, 0, 'n'},
197                 {"verbose", no_argument, 0, 'v'},
198                 {"version", no_argument, 0, 'V'},
199                 {"use-ipv4", no_argument, 0, '4'},
200                 {"use-ipv6", no_argument, 0, '6'},
201                 {"help", no_argument, 0, 'h'},
202                 {0, 0, 0, 0}
203         };
205         if (argc < 2)
206                 return ERROR;
208         for (c = 1; c < argc; c++) {
209                 if (strcmp ("-to", argv[c]) == 0)
210                         strcpy (argv[c], "-t");
211                 else if (strcmp ("-wt", argv[c]) == 0)
212                         strcpy (argv[c], "-w");
213                 else if (strcmp ("-ct", argv[c]) == 0)
214                         strcpy (argv[c], "-c");
215         }
217         while (1) {
218                 c = getopt_long (argc, argv, "+hVv46t:p:f:e:c:w:H:C:",
219                                  long_options, &option_index);
221                 if (c == -1 || c == EOF)
222                         break;
224                 switch (c) {
225                 case 'H':                                                                       /* hostname */
226                         if (is_host (optarg)) {
227                                 server_address = optarg;
228                         }
229                         else {
230                                 usage (_("Invalid host name\n"));
231                         }
232                         break;
233                 case 'p':                                                                       /* port */
234                         if (is_intpos (optarg))
235                                 server_port = atoi (optarg);
236                         else
237                                 usage (_("Server port must be a positive integer\n"));
238                         break;
239                 case 'f':                                                                       /* from argument */
240                         from_arg = optarg;
241                         break;
242                 case 'e':                                                                       /* server expect string on 220  */
243                         server_expect = optarg;
244                         break;
245                 case 'C':                                                                       /* server expect string on 220  */
246                         mail_command = optarg;
247                         smtp_use_dummycmd = 1;
248                         break;
249                 case 'n':                                                                       /* server expect string on 220  */
250                         smtp_use_dummycmd = 0;
251                         break;
252                 case 'c':                                                                       /* critical time threshold */
253                         if (is_intnonneg (optarg)) {
254                                 critical_time = atoi (optarg);
255                                 check_critical_time = TRUE;
256                         }
257                         else {
258                                 usage (_("Critical time must be a nonnegative integer\n"));
259                         }
260                         break;
261                 case 'w':                                                                       /* warning time threshold */
262                         if (is_intnonneg (optarg)) {
263                                 warning_time = atoi (optarg);
264                                 check_warning_time = TRUE;
265                         }
266                         else {
267                                 usage (_("Warning time must be a nonnegative integer\n"));
268                         }
269                         break;
270                 case 'v':                                                                       /* verbose */
271                         verbose++;
272                         break;
273                 case 't':                                                                       /* timeout */
274                         if (is_intnonneg (optarg)) {
275                                 socket_timeout = atoi (optarg);
276                         }
277                         else {
278                                 usage (_("Time interval must be a nonnegative integer\n"));
279                         }
280                         break;
281                 case '4':
282                         address_family = AF_INET;
283                         break;
284                 case '6':
285 #ifdef USE_IPV6
286                         address_family = AF_INET6;
287 #else
288                         usage (_("IPv6 support not available\n"));
289 #endif
290                         break;
291                 case 'V':                                                                       /* version */
292                         print_revision (progname, revision);
293                         exit (STATE_OK);
294                 case 'h':                                                                       /* help */
295                         print_help ();
296                         exit (STATE_OK);
297                 case '?':                                                                       /* help */
298                         usage (_("Invalid argument\n"));
299                 }
300         }
302         c = optind;
303         if (server_address == NULL) {
304                 if (argv[c]) {
305                         if (is_host (argv[c]))
306                                 server_address = argv[c];
307                         else
308                                 usage (_("Invalid host name"));
309                 }
310                 else {
311                         asprintf (&server_address, "127.0.0.1");
312                 }
313         }
315         if (server_expect == NULL)
316                 server_expect = strdup (SMTP_EXPECT);
318         if (mail_command == NULL)
319                 mail_command = strdup("MAIL ");
321         if (from_arg==NULL)
322                 from_arg = strdup(" ");
324         return validate_arguments ();
331 int
332 validate_arguments (void)
334         return OK;
341 \f
342 void
343 print_help (void)
345         char *myport;
346         asprintf (&myport, "%d", SMTP_PORT);
348         print_revision (progname, revision);
350         printf (_("Copyright (c) 1999-2001 Ethan Galstad <nagios@nagios.org>\n"));
351         printf (_(COPYRIGHT), copyright, email);
353         printf(_("\
354 This plugin will attempt to open an SMTP connection with the host.\n\n"));
356         print_usage ();
358         printf (_(UT_HELP_VRSN));
360         printf (_(UT_HOST_PORT), 'p', myport);
362         printf (_(UT_IPv46));
364         printf (_("\
365  -e, --expect=STRING\n\
366    String to expect in first line of server response (default: '%s')\n\
367  -n, nocommand\n\
368    Suppress SMTP command\n\
369  -C, --command=STRING\n\
370    SMTP command (default: '%s')\n\
371  -f, --from=STRING\n\
372    FROM-address to include in MAIL command, required by Exchange 2000\n\
373    (default: '%s')\n"), SMTP_EXPECT, mail_command, from_arg);
375         printf (_(UT_WARN_CRIT));
377         printf (_(UT_TIMEOUT), DEFAULT_SOCKET_TIMEOUT);
379         printf (_(UT_VERBOSE));
381         printf(_("\n\
382 Successul connects return STATE_OK, refusals and timeouts return\n\
383 STATE_CRITICAL, other errors return STATE_UNKNOWN.  Successful\n\
384 connects, but incorrect reponse messages from the host result in\n\
385 STATE_WARNING return values.\n"));
387         printf (_(UT_SUPPORT));
394 void
395 print_usage (void)
397         printf ("\
398 Usage: %s -H host [-p port] [-e expect] [-C command] [-f from addr]\n\
399   [-w warn] [-c crit] [-t timeout] [-n] [-v] [-4|-6]\n", progname);
400         printf (_(UT_HLP_VRS), progname, progname);
403