/***************************************************************************** * * Monitoring check_dig plugin * * License: GPL * Copyright (c) 2002-2008 Monitoring Plugins Development Team * * Description: * * This file contains the check_dig plugin * * * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program. If not, see . * * *****************************************************************************/ /* Hackers note: * There are typecasts to (char *) from _("foo bar") in this file. * They prevent compiler warnings. Never (ever), permute strings obtained * that are typecast from (const char *) (which happens when --disable-nls) * because on some architectures those strings are in non-writable memory */ const char *progname = "check_dig"; const char *copyright = "2002-2008"; const char *email = "devel@monitoring-plugins.org"; #include "common.h" #include "netutils.h" #include "utils.h" #include "runcmd.h" int process_arguments (int, char **); int validate_arguments (void); void print_help (void); void print_usage (void); #define UNDEFINED 0 #define DEFAULT_PORT 53 #define DEFAULT_TRIES 3 char *query_address = NULL; char *record_type = "A"; char *expected_address = NULL; char *dns_server = NULL; char *dig_args = ""; char *query_transport = ""; int verbose = FALSE; int server_port = DEFAULT_PORT; int number_tries = DEFAULT_TRIES; double warning_interval = UNDEFINED; double critical_interval = UNDEFINED; struct timeval tv; int main (int argc, char **argv) { char *command_line; output chld_out, chld_err; char *msg = NULL; size_t i; char *t; long microsec; double elapsed_time; int result = STATE_UNKNOWN; setlocale (LC_ALL, ""); bindtextdomain (PACKAGE, LOCALEDIR); textdomain (PACKAGE); /* Set signal handling and alarm */ if (signal (SIGALRM, runcmd_timeout_alarm_handler) == SIG_ERR) usage_va(_("Cannot catch SIGALRM")); /* Parse extra opts if any */ argv=np_extra_opts (&argc, argv, progname); if (process_arguments (argc, argv) == ERROR) usage_va(_("Could not parse arguments")); /* dig applies the timeout to each try, so we need to work around this */ int timeout_interval_dig = ceil((double) timeout_interval / (double) number_tries); /* get the command to run */ xasprintf (&command_line, "%s @%s -p %d %s -t %s %s %s +tries=%d +time=%d", PATH_TO_DIG, dns_server, server_port, query_address, record_type, dig_args, query_transport, number_tries, timeout_interval_dig); alarm (timeout_interval); gettimeofday (&tv, NULL); if (verbose) { printf ("%s\n", command_line); if(expected_address != NULL) { printf (_("Looking for: '%s'\n"), expected_address); } else { printf (_("Looking for: '%s'\n"), query_address); } } /* run the command */ if(np_runcmd(command_line, &chld_out, &chld_err, 0) != 0) { result = STATE_WARNING; msg = (char *)_("dig returned an error status"); } for(i = 0; i < chld_out.lines; i++) { /* the server is responding, we just got the host name... */ if (strstr (chld_out.line[i], ";; ANSWER SECTION:")) { /* loop through the whole 'ANSWER SECTION' */ for(; i < chld_out.lines; i++) { /* get the host address */ if (verbose) printf ("%s\n", chld_out.line[i]); if (strstr (chld_out.line[i], (expected_address == NULL ? query_address : expected_address)) != NULL) { msg = chld_out.line[i]; result = STATE_OK; /* Translate output TAB -> SPACE */ t = msg; while ((t = strchr(t, '\t')) != NULL) *t = ' '; break; } } if (result == STATE_UNKNOWN) { msg = (char *)_("Server not found in ANSWER SECTION"); result = STATE_WARNING; } /* we found the answer section, so break out of the loop */ break; } } if (result == STATE_UNKNOWN) { msg = (char *)_("No ANSWER SECTION found"); result = STATE_CRITICAL; } /* If we get anything on STDERR, at least set warning */ if(chld_err.buflen > 0) { result = max_state(result, STATE_WARNING); if(!msg) for(i = 0; i < chld_err.lines; i++) { msg = strchr(chld_err.line[0], ':'); if(msg) { msg++; break; } } } microsec = deltime (tv); elapsed_time = (double)microsec / 1.0e6; if (critical_interval > UNDEFINED && elapsed_time > critical_interval) result = STATE_CRITICAL; else if (warning_interval > UNDEFINED && elapsed_time > warning_interval) result = STATE_WARNING; printf ("DNS %s - %.3f seconds response time (%s)|%s\n", state_text (result), elapsed_time, msg ? msg : _("Probably a non-existent host/domain"), fperfdata("time", elapsed_time, "s", (warning_interval>UNDEFINED?TRUE:FALSE), warning_interval, (critical_interval>UNDEFINED?TRUE:FALSE), critical_interval, TRUE, 0, FALSE, 0)); return result; } /* process command-line arguments */ int process_arguments (int argc, char **argv) { int c; int option = 0; static struct option longopts[] = { {"hostname", required_argument, 0, 'H'}, {"query_address", required_argument, 0, 'l'}, {"warning", required_argument, 0, 'w'}, {"critical", required_argument, 0, 'c'}, {"timeout", required_argument, 0, 't'}, {"dig-arguments", required_argument, 0, 'A'}, {"verbose", no_argument, 0, 'v'}, {"version", no_argument, 0, 'V'}, {"help", no_argument, 0, 'h'}, {"record_type", required_argument, 0, 'T'}, {"expected_address", required_argument, 0, 'a'}, {"port", required_argument, 0, 'p'}, {"use-ipv4", no_argument, 0, '4'}, {"use-ipv6", no_argument, 0, '6'}, {0, 0, 0, 0} }; if (argc < 2) return ERROR; while (1) { c = getopt_long (argc, argv, "hVvt:l:H:w:c:T:p:a:A:46", longopts, &option); if (c == -1 || c == EOF) break; switch (c) { case 'h': /* help */ print_help (); exit (STATE_OK); case 'V': /* version */ print_revision (progname, NP_VERSION); exit (STATE_OK); case 'H': /* hostname */ host_or_die(optarg); dns_server = optarg; break; case 'p': /* server port */ if (is_intpos (optarg)) { server_port = atoi (optarg); } else { usage_va(_("Port must be a positive integer - %s"), optarg); } break; case 'l': /* address to lookup */ query_address = optarg; break; case 'w': /* warning */ if (is_nonnegative (optarg)) { warning_interval = strtod (optarg, NULL); } else { usage_va(_("Warning interval must be a positive integer - %s"), optarg); } break; case 'c': /* critical */ if (is_nonnegative (optarg)) { critical_interval = strtod (optarg, NULL); } else { usage_va(_("Critical interval must be a positive integer - %s"), optarg); } break; case 't': /* timeout */ if (is_intnonneg (optarg)) { timeout_interval = atoi (optarg); } else { usage_va(_("Timeout interval must be a positive integer - %s"), optarg); } break; case 'A': /* dig arguments */ dig_args = strdup(optarg); break; case 'v': /* verbose */ verbose = TRUE; break; case 'T': record_type = optarg; break; case 'a': expected_address = optarg; break; case '4': query_transport = "-4"; break; case '6': query_transport = "-6"; break; default: /* usage5 */ usage5(); } } c = optind; if (dns_server == NULL) { if (c < argc) { host_or_die(argv[c]); dns_server = argv[c]; } else { dns_server = strdup ("127.0.0.1"); } } return validate_arguments (); } int validate_arguments (void) { if (query_address != NULL) return OK; else return ERROR; } void print_help (void) { char *myport; xasprintf (&myport, "%d", DEFAULT_PORT); print_revision (progname, NP_VERSION); printf ("Copyright (c) 2000 Karl DeBisschop \n"); printf (COPYRIGHT, copyright, email); printf (_("This plugin test the DNS service on the specified host using dig")); printf ("\n\n"); print_usage (); printf (UT_HELP_VRSN); printf (UT_EXTRA_OPTS); printf (UT_HOST_PORT, 'p', myport); printf (" %s\n","-4, --use-ipv4"); printf (" %s\n",_("Force dig to only use IPv4 query transport")); printf (" %s\n","-6, --use-ipv6"); printf (" %s\n",_("Force dig to only use IPv6 query transport")); printf (" %s\n","-l, --query_address=STRING"); printf (" %s\n",_("Machine name to lookup")); printf (" %s\n","-T, --record_type=STRING"); printf (" %s\n",_("Record type to lookup (default: A)")); printf (" %s\n","-a, --expected_address=STRING"); printf (" %s\n",_("An address expected to be in the answer section. If not set, uses whatever")); printf (" %s\n",_("was in -l")); printf (" %s\n","-A, --dig-arguments=STRING"); printf (" %s\n",_("Pass STRING as argument(s) to dig")); printf (UT_WARN_CRIT); printf (UT_CONN_TIMEOUT, DEFAULT_SOCKET_TIMEOUT); printf (UT_VERBOSE); printf ("\n"); printf ("%s\n", _("Examples:")); printf (" %s\n", "check_dig -H DNSSERVER -l www.example.com -A \"+tcp\""); printf (" %s\n", "This will send a tcp query to DNSSERVER for www.example.com"); printf (UT_SUPPORT); } void print_usage (void) { printf ("%s\n", _("Usage:")); printf ("%s -l [-H ] [-p ]\n", progname); printf (" [-T ] [-w ] [-c ]\n"); printf (" [-t ] [-a ] [-v]\n"); }