1 /*****************************************************************************
2 *
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.
7 *
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.
12 *
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.
16 *
17 *****************************************************************************/
19 #include "config.h"
20 #include "common.h"
21 #include "netutils.h"
22 #include "utils.h"
23 #include "popen.h"
25 int process_arguments (int, char **);
26 int validate_arguments (void);
27 void print_help (void);
28 void print_usage (void);
30 const char *progname = "check_dig";
31 const char *revision = "$Revision$";
32 const char *copyright = "2002-2003";
33 const char *email = "nagiosplug-devel@lists.sourceforge.net";
35 enum {
36 DEFAULT_PORT = 53
37 };
39 void
40 print_usage (void)
41 {
42 printf (_("\
43 Usage: %s -H host -l lookup [-p <server port>] [-w <warning interval>]\n\
44 [-c <critical interval>] [-t <timeout>] [-v]\n"),
45 progname);
46 printf (" %s (-h|--help)\n", progname);
47 printf (" %s (-V|--version)\n", progname);
48 }
50 void
51 print_help (void)
52 {
53 char *myport;
55 asprintf (&myport, "%d", DEFAULT_PORT);
57 print_revision (progname, revision);
59 printf (_(COPYRIGHT), copyright, email);
61 printf (_("Test the DNS service on the specified host using dig\n\n"));
63 print_usage ();
65 printf (_(UT_HELP_VRSN));
67 printf (_(UT_HOST_PORT), 'P', myport);
69 printf (_("\
70 -l, --lookup=STRING\n\
71 machine name to lookup\n"));
73 printf (_(UT_WARN_CRIT));
75 printf (_(UT_TIMEOUT), DEFAULT_SOCKET_TIMEOUT);
77 printf (_(UT_VERBOSE));
79 support ();
80 }
81 \f
83 char *query_address = NULL;
84 char *dns_server = NULL;
85 int verbose = FALSE;
86 int server_port = DEFAULT_PORT;
87 int warning_interval = -1;
88 int critical_interval = -1;
91 int
92 main (int argc, char **argv)
93 {
94 char input_buffer[MAX_INPUT_BUFFER];
95 char *command_line = NULL;
96 char *output = "";
97 int result = STATE_UNKNOWN;
99 /* Set signal handling and alarm */
100 if (signal (SIGALRM, popen_timeout_alarm_handler) == SIG_ERR)
101 usage (_("Cannot catch SIGALRM\n"));
103 if (process_arguments (argc, argv) != OK)
104 usage (_("Could not parse arguments\n"));
106 /* get the command to run */
107 asprintf (&command_line, "%s @%s -p %d %s",
108 PATH_TO_DIG, dns_server, server_port, query_address);
110 alarm (timeout_interval);
111 time (&start_time);
113 if (verbose)
114 printf ("%s\n", command_line);
115 /* run the command */
116 child_process = spopen (command_line);
117 if (child_process == NULL) {
118 printf (_("Could not open pipe: %s\n"), command_line);
119 return STATE_UNKNOWN;
120 }
122 child_stderr = fdopen (child_stderr_array[fileno (child_process)], "r");
123 if (child_stderr == NULL)
124 printf (_("Could not open stderr for %s\n"), command_line);
126 while (fgets (input_buffer, MAX_INPUT_BUFFER - 1, child_process)) {
128 /* the server is responding, we just got the host name... */
129 if (strstr (input_buffer, ";; ANSWER SECTION:")) {
131 /* get the host address */
132 if (!fgets (input_buffer, MAX_INPUT_BUFFER - 1, child_process))
133 break;
135 if (strpbrk (input_buffer, "\r\n"))
136 input_buffer[strcspn (input_buffer, "\r\n")] = '\0';
138 if (strstr (input_buffer, query_address) == input_buffer) {
139 asprintf (&output, input_buffer);
140 result = STATE_OK;
141 }
142 else {
143 asprintf (&output, _("Server not found in ANSWER SECTION"));
144 result = STATE_WARNING;
145 }
147 continue;
148 }
150 }
152 if (result != STATE_OK) {
153 asprintf (&output, _("No ANSWER SECTION found"));
154 }
156 while (fgets (input_buffer, MAX_INPUT_BUFFER - 1, child_stderr)) {
157 /* If we get anything on STDERR, at least set warning */
158 result = max_state (result, STATE_WARNING);
159 printf ("%s", input_buffer);
160 if (strlen (output) == 0)
161 asprintf (&output, 1 + index (input_buffer, ':'));
162 }
164 (void) fclose (child_stderr);
166 /* close the pipe */
167 if (spclose (child_process)) {
168 result = max_state (result, STATE_WARNING);
169 if (strlen (output) == 0)
170 asprintf (&output, _("dig returned error status"));
171 }
173 (void) time (&end_time);
175 if (output == NULL || strlen (output) == 0)
176 asprintf (&output, _(" Probably a non-existent host/domain"));
178 if (result == STATE_OK)
179 printf (_("DNS OK - %d seconds response time (%s)\n"),
180 (int) (end_time - start_time), output);
181 else if (result == STATE_WARNING)
182 printf (_("DNS WARNING - %s\n"), output);
183 else if (result == STATE_CRITICAL)
184 printf (_("DNS CRITICAL - %s\n"), output);
185 else
186 printf (_("DNS problem - %s\n"), output);
188 return result;
189 }
191 /* process command-line arguments */
192 int
193 process_arguments (int argc, char **argv)
194 {
195 int c;
197 int option_index = 0;
198 static struct option long_options[] = {
199 {"hostname", required_argument, 0, 'H'},
200 {"query_address", required_argument, 0, 'e'},
201 {"verbose", no_argument, 0, 'v'},
202 {"version", no_argument, 0, 'V'},
203 {"help", no_argument, 0, 'h'},
204 {0, 0, 0, 0}
205 };
207 if (argc < 2)
208 return ERROR;
210 while (1) {
211 c = getopt_long (argc, argv, "hVvt:l:H:", long_options, &option_index);
213 if (c == -1 || c == EOF)
214 break;
216 switch (c) {
217 case '?': /* help */
218 usage3 (_("Unknown argument"), optopt);
219 case 'h': /* help */
220 print_help ();
221 exit (STATE_OK);
222 case 'V': /* version */
223 print_revision (progname, "$Revision$");
224 exit (STATE_OK);
225 case 'H': /* hostname */
226 if (is_host (optarg)) {
227 dns_server = optarg;
228 }
229 else {
230 usage2 (_("Invalid host name"), optarg);
231 }
232 break;
233 case 'p':
234 if (is_intpos (optarg)) {
235 server_port = atoi (optarg);
236 }
237 else {
238 usage2 (_("Server port must be a nonnegative integer\n"), optarg);
239 }
240 break;
241 case 'l': /* username */
242 query_address = optarg;
243 break;
244 case 'w': /* timeout */
245 if (is_intnonneg (optarg)) {
246 warning_interval = atoi (optarg);
247 }
248 else {
249 usage2 (_("Warning interval must be a nonnegative integer\n"), optarg);
250 }
251 break;
252 case 'c': /* timeout */
253 if (is_intnonneg (optarg)) {
254 critical_interval = atoi (optarg);
255 }
256 else {
257 usage2 (_("Critical interval must be a nonnegative integer\n"), optarg);
258 }
259 break;
260 case 't': /* timeout */
261 if (is_intnonneg (optarg)) {
262 timeout_interval = atoi (optarg);
263 }
264 else {
265 usage2 (_("Time interval must be a nonnegative integer\n"), optarg);
266 }
267 break;
268 case 'v': /* verbose */
269 verbose = TRUE;
270 break;
271 }
272 }
274 c = optind;
275 if (dns_server == NULL) {
276 if (c < argc) {
277 if (is_host (argv[c])) {
278 dns_server = argv[c];
279 }
280 else {
281 usage2 (_("Invalid host name"), argv[c]);
282 }
283 }
284 else {
285 dns_server = strdup ("127.0.0.1");
286 }
287 }
289 return validate_arguments ();
290 }
296 int
297 validate_arguments (void)
298 {
299 return OK;
300 }
301 \f