365 lines
9 KiB
C
365 lines
9 KiB
C
/*****************************************************************************
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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$Id: check_dig.c,v 1.40 2005/01/26 21:21:01 tonvoon Exp $
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*****************************************************************************/
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const char *progname = "check_dig";
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const char *revision = "$Revision: 1.40 $";
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const char *copyright = "2002-2004";
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const char *email = "nagiosplug-devel@lists.sourceforge.net";
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#include "common.h"
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#include "netutils.h"
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#include "utils.h"
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#include "popen.h"
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int process_arguments (int, char **);
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int validate_arguments (void);
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void print_help (void);
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void print_usage (void);
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enum {
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UNDEFINED = 0,
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DEFAULT_PORT = 53
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};
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char *query_address = NULL;
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char *record_type = "A";
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char *expected_address = NULL;
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char *dns_server = NULL;
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int verbose = FALSE;
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int server_port = DEFAULT_PORT;
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double warning_interval = UNDEFINED;
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double critical_interval = UNDEFINED;
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struct timeval tv;
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int
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main (int argc, char **argv)
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{
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char input_buffer[MAX_INPUT_BUFFER];
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char *command_line;
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char *output;
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char *t;
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long microsec;
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double elapsed_time;
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int result = STATE_UNKNOWN;
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output = strdup ("");
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setlocale (LC_ALL, "");
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bindtextdomain (PACKAGE, LOCALEDIR);
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textdomain (PACKAGE);
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/* Set signal handling and alarm */
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if (signal (SIGALRM, popen_timeout_alarm_handler) == SIG_ERR)
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usage4 (_("Cannot catch SIGALRM"));
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if (process_arguments (argc, argv) == ERROR)
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usage4 (_("Could not parse arguments"));
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/* get the command to run */
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asprintf (&command_line, "%s @%s -p %d %s -t %s",
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PATH_TO_DIG, dns_server, server_port, query_address, record_type);
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alarm (timeout_interval);
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gettimeofday (&tv, NULL);
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if (verbose) {
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printf ("%s\n", command_line);
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if(expected_address != NULL) {
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printf (_("Looking for: '%s'\n"), expected_address);
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} else {
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printf (_("Looking for: '%s'\n"), query_address);
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}
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}
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/* run the command */
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child_process = spopen (command_line);
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if (child_process == NULL) {
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printf (_("Could not open pipe: %s\n"), command_line);
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return STATE_UNKNOWN;
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}
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child_stderr = fdopen (child_stderr_array[fileno (child_process)], "r");
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if (child_stderr == NULL)
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printf (_("Could not open stderr for %s\n"), command_line);
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while (fgets (input_buffer, MAX_INPUT_BUFFER - 1, child_process)) {
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/* the server is responding, we just got the host name... */
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if (strstr (input_buffer, ";; ANSWER SECTION:")) {
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/* loop through the whole 'ANSWER SECTION' */
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do {
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/* get the host address */
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if (!fgets (input_buffer, MAX_INPUT_BUFFER - 1, child_process))
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break;
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if (strpbrk (input_buffer, "\r\n"))
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input_buffer[strcspn (input_buffer, "\r\n")] = '\0';
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if (verbose && !strstr (input_buffer, ";; "))
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printf ("%s\n", input_buffer);
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if (expected_address==NULL && strstr (input_buffer, query_address) != NULL) {
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output = strdup(input_buffer);
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result = STATE_OK;
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}
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else if (expected_address != NULL && strstr (input_buffer, expected_address) != NULL) {
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output = strdup(input_buffer);
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result = STATE_OK;
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}
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/* Translate output TAB -> SPACE */
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t = output;
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while ((t = index(t, '\t')) != NULL)
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*t = ' ';
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} while (!strstr (input_buffer, ";; "));
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if (result == STATE_UNKNOWN) {
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asprintf (&output, _("Server not found in ANSWER SECTION"));
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result = STATE_WARNING;
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}
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}
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}
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if (result == STATE_UNKNOWN) {
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asprintf (&output, _("No ANSWER SECTION found"));
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}
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while (fgets (input_buffer, MAX_INPUT_BUFFER - 1, child_stderr)) {
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/* If we get anything on STDERR, at least set warning */
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result = max_state (result, STATE_WARNING);
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printf ("%s", input_buffer);
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if (strlen (output) == 0)
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output = strdup (1 + index (input_buffer, ':'));
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}
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(void) fclose (child_stderr);
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/* close the pipe */
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if (spclose (child_process)) {
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result = max_state (result, STATE_WARNING);
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if (strlen (output) == 0)
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asprintf (&output, _("dig returned an error status"));
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}
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microsec = deltime (tv);
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elapsed_time = (double)microsec / 1.0e6;
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if (output == NULL || strlen (output) == 0)
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asprintf (&output, _(" Probably a non-existent host/domain"));
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if (critical_interval > UNDEFINED && elapsed_time > critical_interval)
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result = STATE_CRITICAL;
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else if (warning_interval > UNDEFINED && elapsed_time > warning_interval)
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result = STATE_WARNING;
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asprintf (&output, _("%.3f seconds response time (%s)"), elapsed_time, output);
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printf ("DNS %s - %s|%s\n",
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state_text (result), output,
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fperfdata("time", elapsed_time, "s",
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(warning_interval>UNDEFINED?TRUE:FALSE),
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warning_interval,
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(critical_interval>UNDEFINED?TRUE:FALSE),
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critical_interval,
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TRUE, 0, FALSE, 0));
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return result;
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}
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/* process command-line arguments */
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int
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process_arguments (int argc, char **argv)
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{
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int c;
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int option = 0;
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static struct option longopts[] = {
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{"hostname", required_argument, 0, 'H'},
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{"query_address", required_argument, 0, 'l'},
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{"warning", required_argument, 0, 'w'},
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{"critical", required_argument, 0, 'c'},
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{"timeout", required_argument, 0, 't'},
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{"verbose", no_argument, 0, 'v'},
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{"version", no_argument, 0, 'V'},
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{"help", no_argument, 0, 'h'},
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{"record_type", required_argument, 0, 'T'},
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{"expected_address", required_argument, 0, 'a'},
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{0, 0, 0, 0}
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};
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if (argc < 2)
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return ERROR;
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while (1) {
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c = getopt_long (argc, argv, "hVvt:l:H:w:c:T:a:", longopts, &option);
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if (c == -1 || c == EOF)
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break;
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switch (c) {
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case '?': /* help */
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usage2 (_("Unknown argument"), optarg);
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case 'h': /* help */
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print_help ();
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exit (STATE_OK);
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case 'V': /* version */
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print_revision (progname, revision);
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exit (STATE_OK);
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case 'H': /* hostname */
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if (is_host (optarg)) {
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dns_server = optarg;
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}
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else {
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usage2 (_("Invalid hostname/address"), optarg);
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}
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break;
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case 'p': /* server port */
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if (is_intpos (optarg)) {
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server_port = atoi (optarg);
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}
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else {
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usage2 (_("Port must be a positive integer"), optarg);
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}
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break;
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case 'l': /* address to lookup */
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query_address = optarg;
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break;
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case 'w': /* warning */
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if (is_nonnegative (optarg)) {
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warning_interval = strtod (optarg, NULL);
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}
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else {
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usage2 (_("Warning interval must be a positive integer"), optarg);
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}
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break;
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case 'c': /* critical */
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if (is_nonnegative (optarg)) {
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critical_interval = strtod (optarg, NULL);
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}
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else {
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usage2 (_("Critical interval must be a positive integer"), optarg);
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}
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break;
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case 't': /* timeout */
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if (is_intnonneg (optarg)) {
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timeout_interval = atoi (optarg);
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}
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else {
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usage2 (_("Timeout interval must be a positive integer"), optarg);
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}
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break;
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case 'v': /* verbose */
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verbose = TRUE;
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break;
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case 'T':
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record_type = optarg;
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break;
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case 'a':
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expected_address = optarg;
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break;
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}
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}
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c = optind;
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if (dns_server == NULL) {
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if (c < argc) {
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if (is_host (argv[c])) {
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dns_server = argv[c];
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}
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else {
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usage2 (_("Invalid hostname/address"), argv[c]);
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}
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}
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else {
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dns_server = strdup ("127.0.0.1");
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}
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}
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return validate_arguments ();
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}
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int
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validate_arguments (void)
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{
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return OK;
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}
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void
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print_help (void)
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{
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char *myport;
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asprintf (&myport, "%d", DEFAULT_PORT);
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print_revision (progname, revision);
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printf ("Copyright (c) 2000 Karl DeBisschop <kdebisschop@users.sourceforge.net>\n");
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printf (COPYRIGHT, copyright, email);
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printf (_("Test the DNS service on the specified host using dig\n\n"));
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print_usage ();
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printf (_(UT_HELP_VRSN));
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printf (_(UT_HOST_PORT), 'P', myport);
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printf (_("\
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-l, --lookup=STRING\n\
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machine name to lookup\n"));
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printf (_("\
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-T, --record_type=STRING\n\
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record type to lookup (default: A)\n"));
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printf (_("\
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-a, --expected_address=STRING\n\
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an address expected to be in the answer section.\n\
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if not set, uses whatever was in -l\n"));
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printf (_(UT_WARN_CRIT));
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printf (_(UT_TIMEOUT), DEFAULT_SOCKET_TIMEOUT);
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printf (_(UT_VERBOSE));
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printf (_(UT_SUPPORT));
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}
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void
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print_usage (void)
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{
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printf ("\
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Usage: %s -H host -l lookup [-p <server port>] [-T <query type>]\n\
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[-w <warning interval>] [-c <critical interval>] [-t <timeout>]\n\
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[-a <expected answer address>] [-v]\n", progname);
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}
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