380 lines
10 KiB
C
380 lines
10 KiB
C
/*****************************************************************************
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*
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* Monitoring check_dig plugin
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*
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* License: GPL
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* Copyright (c) 2002-2008 Monitoring Plugins Development Team
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*
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* Description:
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*
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* This file contains the check_dig plugin
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*
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*
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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 3 of the License, or
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* (at your option) any later version.
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*
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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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*
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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, see <http://www.gnu.org/licenses/>.
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*
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*
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*****************************************************************************/
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/* Hackers note:
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* There are typecasts to (char *) from _("foo bar") in this file.
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* They prevent compiler warnings. Never (ever), permute strings obtained
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* that are typecast from (const char *) (which happens when --disable-nls)
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* because on some architectures those strings are in non-writable memory */
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const char *progname = "check_dig";
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const char *copyright = "2002-2008";
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const char *email = "devel@monitoring-plugins.org";
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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 "runcmd.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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#define UNDEFINED 0
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#define DEFAULT_PORT 53
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#define DEFAULT_TRIES 2
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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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char *dig_args = "";
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char *query_transport = "";
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bool verbose = false;
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int server_port = DEFAULT_PORT;
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int number_tries = DEFAULT_TRIES;
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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 *command_line;
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output chld_out, chld_err;
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char *msg = NULL;
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size_t i;
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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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int timeout_interval_dig;
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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, runcmd_timeout_alarm_handler) == SIG_ERR)
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usage_va(_("Cannot catch SIGALRM"));
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/* Parse extra opts if any */
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argv=np_extra_opts (&argc, argv, progname);
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if (process_arguments (argc, argv) == ERROR)
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usage_va(_("Could not parse arguments"));
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/* dig applies the timeout to each try, so we need to work around this */
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timeout_interval_dig = timeout_interval / number_tries + number_tries;
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/* get the command to run */
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xasprintf (&command_line, "%s %s %s -p %d @%s %s %s +retry=%d +time=%d",
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PATH_TO_DIG, dig_args, query_transport, server_port, dns_server, query_address, record_type, number_tries, timeout_interval_dig);
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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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if(np_runcmd(command_line, &chld_out, &chld_err, 0) != 0) {
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result = STATE_WARNING;
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msg = (char *)_("dig returned an error status");
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}
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for(i = 0; i < chld_out.lines; i++) {
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/* the server is responding, we just got the host name... */
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if (strstr (chld_out.line[i], ";; ANSWER SECTION:")) {
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/* loop through the whole 'ANSWER SECTION' */
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for(; i < chld_out.lines; i++) {
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/* get the host address */
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if (verbose)
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printf ("%s\n", chld_out.line[i]);
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if (strcasestr (chld_out.line[i], (expected_address == NULL ? query_address : expected_address)) != NULL) {
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msg = chld_out.line[i];
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result = STATE_OK;
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/* Translate output TAB -> SPACE */
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t = msg;
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while ((t = strchr(t, '\t')) != NULL) *t = ' ';
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break;
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}
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}
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if (result == STATE_UNKNOWN) {
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msg = (char *)_("Server not found in ANSWER SECTION");
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result = STATE_WARNING;
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}
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/* we found the answer section, so break out of the loop */
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break;
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}
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}
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if (result == STATE_UNKNOWN) {
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msg = (char *)_("No ANSWER SECTION found");
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result = STATE_CRITICAL;
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}
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/* If we get anything on STDERR, at least set warning */
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if(chld_err.buflen > 0) {
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result = max_state(result, STATE_WARNING);
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if(!msg) for(i = 0; i < chld_err.lines; i++) {
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msg = strchr(chld_err.line[0], ':');
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if(msg) {
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msg++;
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break;
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}
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}
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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 (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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printf ("DNS %s - %.3f seconds response time (%s)|%s\n",
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state_text (result), elapsed_time,
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msg ? msg : _("Probably a non-existent host/domain"),
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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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{"dig-arguments", required_argument, 0, 'A'},
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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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{"port", required_argument, 0, 'p'},
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{"use-ipv4", no_argument, 0, '4'},
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{"use-ipv6", no_argument, 0, '6'},
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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:p:a:A:46", 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 'h': /* help */
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print_help ();
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exit (STATE_UNKNOWN);
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case 'V': /* version */
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print_revision (progname, NP_VERSION);
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exit (STATE_UNKNOWN);
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case 'H': /* hostname */
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host_or_die(optarg);
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dns_server = optarg;
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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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usage_va(_("Port must be a positive integer - %s"), 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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usage_va(_("Warning interval must be a positive integer - %s"), 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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usage_va(_("Critical interval must be a positive integer - %s"), 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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usage_va(_("Timeout interval must be a positive integer - %s"), optarg);
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}
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break;
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case 'A': /* dig arguments */
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dig_args = strdup(optarg);
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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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case '4':
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query_transport = "-4";
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break;
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case '6':
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query_transport = "-6";
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break;
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default: /* usage5 */
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usage5();
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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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host_or_die(argv[c]);
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dns_server = argv[c];
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}
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else {
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if (strcmp(query_transport,"-6") == 0)
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dns_server = strdup("::1");
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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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if (query_address != NULL)
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return OK;
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else
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return ERROR;
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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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xasprintf (&myport, "%d", DEFAULT_PORT);
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print_revision (progname, NP_VERSION);
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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 (_("This plugin tests the DNS service on the specified host using dig"));
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printf ("\n\n");
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print_usage ();
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printf (UT_HELP_VRSN);
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printf (UT_EXTRA_OPTS);
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printf (UT_HOST_PORT, 'p', myport);
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printf (" %s\n","-4, --use-ipv4");
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printf (" %s\n",_("Force dig to only use IPv4 query transport"));
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printf (" %s\n","-6, --use-ipv6");
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printf (" %s\n",_("Force dig to only use IPv6 query transport"));
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printf (" %s\n","-l, --query_address=STRING");
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printf (" %s\n",_("Machine name to lookup"));
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printf (" %s\n","-T, --record_type=STRING");
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printf (" %s\n",_("Record type to lookup (default: A)"));
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printf (" %s\n","-a, --expected_address=STRING");
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printf (" %s\n",_("An address expected to be in the answer section. If not set, uses whatever"));
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printf (" %s\n",_("was in -l"));
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printf (" %s\n","-A, --dig-arguments=STRING");
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printf (" %s\n",_("Pass STRING as argument(s) to dig"));
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printf (UT_WARN_CRIT);
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printf (UT_CONN_TIMEOUT, DEFAULT_SOCKET_TIMEOUT);
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printf (UT_VERBOSE);
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printf ("\n");
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printf ("%s\n", _("Examples:"));
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printf (" %s\n", "check_dig -H DNSSERVER -l www.example.com -A \"+tcp\"");
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printf (" %s\n", "This will send a tcp query to DNSSERVER for www.example.com");
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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 ("%s\n", _("Usage:"));
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printf ("%s -l <query_address> [-H <host>] [-p <server port>]\n", progname);
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printf (" [-T <query type>] [-w <warning interval>] [-c <critical interval>]\n");
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printf (" [-t <timeout>] [-a <expected answer address>] [-v]\n");
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}
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