/****************************************************************************** * * CHECK_UDP.C * * Program: UDP port plugin for Nagios * License: GPL * Copyright (c) 1999 Ethan Galstad (nagios@nagios.org) * * Last Modified: $Date$ * * Command line: CHECK_UDP [-p port] [-s send] [-e expect] \ * [-wt warn_time] [-ct crit_time] [-to to_sec] * * Description: * * This plugin will attempt to connect to the specified port * on the host. Successul connects return STATE_OK, refusals * and timeouts return STATE_CRITICAL, other errors return * STATE_UNKNOWN. * * License Information: * * 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 2 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, write to the Free Software * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. * *****************************************************************************/ #include "config.h" #include "common.h" #include "netutils.h" #include "utils.h" const char *progname = "check_udp"; int warning_time = 0; int check_warning_time = FALSE; int critical_time = 0; int check_critical_time = FALSE; int process_arguments (int, char **); void print_usage (void); void print_help (void); int verbose = FALSE; int server_port = 0; char *server_address = NULL; char *server_expect = NULL; char *server_send = ""; int main (int argc, char **argv) { int result; char recv_buffer[MAX_INPUT_BUFFER]; if (process_arguments (argc, argv) == ERROR) usage ("\n"); /* initialize alarm signal handling */ signal (SIGALRM, socket_timeout_alarm_handler); /* set socket timeout */ alarm (socket_timeout); time (&start_time); result = process_udp_request (server_address, server_port, server_send, recv_buffer, MAX_INPUT_BUFFER - 1); time (&end_time); if (result != STATE_OK) { printf ("No response from host on port %d\n", server_port); result = STATE_CRITICAL; } else { /* check to see if we got the response we wanted */ if (server_expect) { if (!strstr (recv_buffer, server_expect)) { printf ("Invalid response received from host on port %d\n", server_port); result = STATE_CRITICAL; } } } /* we connected, so close connection before exiting */ if (result == STATE_OK) { if (check_critical_time == TRUE && (end_time - start_time) > critical_time) result = STATE_CRITICAL; else if (check_warning_time == TRUE && (end_time - start_time) > warning_time) result = STATE_WARNING; printf ("Connection %s on port %d - %d second response time\n", (result == STATE_OK) ? "accepted" : "problem", server_port, (int) (end_time - start_time)); } /* reset the alarm */ alarm (0); return result; } /* process command-line arguments */ int process_arguments (int argc, char **argv) { int c; #ifdef HAVE_GETOPT_H int option_index = 0; static struct option long_options[] = { {"hostname", required_argument, 0, 'H'}, {"critical", required_argument, 0, 'c'}, {"warning", required_argument, 0, 'w'}, {"timeout", required_argument, 0, 't'}, {"port", required_argument, 0, 'p'}, {"expect", required_argument, 0, 'e'}, {"send", required_argument, 0, 's'}, {"verbose", no_argument, 0, 'v'}, {"version", no_argument, 0, 'V'}, {"help", no_argument, 0, 'h'}, {0, 0, 0, 0} }; #endif if (argc < 2) usage ("\n"); for (c = 1; c < argc; c++) { if (strcmp ("-to", argv[c]) == 0) strcpy (argv[c], "-t"); else if (strcmp ("-wt", argv[c]) == 0) strcpy (argv[c], "-w"); else if (strcmp ("-ct", argv[c]) == 0) strcpy (argv[c], "-c"); } while (1) { #ifdef HAVE_GETOPT_H c = getopt_long (argc, argv, "+hVvH:e:s:c:w:t:p:", long_options, &option_index); #else c = getopt (argc, argv, "+hVvH:e:s:c:w:t:p:"); #endif if (c == -1 || c == EOF || c == 1) break; switch (c) { case '?': /* print short usage statement if args not parsable */ printf ("%s: Unknown argument: %s\n\n", progname, optarg); print_usage (); exit (STATE_UNKNOWN); case 'h': /* help */ print_help (); exit (STATE_OK); case 'V': /* version */ print_revision (progname, "$Revision$"); exit (STATE_OK); case 'v': /* verbose mode */ verbose = TRUE; break; case 'H': /* hostname */ if (is_host (optarg) == FALSE) usage ("Invalid host name/address\n"); server_address = optarg; break; case 'c': /* critical */ if (!is_intnonneg (optarg)) usage ("Critical threshold must be a nonnegative integer\n"); critical_time = atoi (optarg); check_critical_time = TRUE; break; case 'w': /* warning */ if (!is_intnonneg (optarg)) usage ("Warning threshold must be a nonnegative integer\n"); warning_time = atoi (optarg); check_warning_time = TRUE; break; case 't': /* timeout */ if (!is_intnonneg (optarg)) usage ("Timeout interval must be a nonnegative integer\n"); socket_timeout = atoi (optarg); break; case 'p': /* port */ if (!is_intnonneg (optarg)) usage ("Serevr port must be a nonnegative integer\n"); server_port = atoi (optarg); break; case 'e': /* expect */ server_expect = optarg; break; case 's': /* send */ server_send = optarg; break; } } c = optind; if (server_address == NULL && c < argc && argv[c]) { if (is_host (argv[c]) == FALSE) usage ("Invalid host name/address\n"); server_address = argv[c++]; } if (server_address == NULL) usage ("Host name was not supplied\n"); return c; } void print_usage (void) { printf ("Usage: %s -H [-p port] [-w warn_time] [-c crit_time]\n" " [-e expect] [-s send] [-t to_sec] [-v]\n", progname); } void print_help (void) { print_revision (progname, "$Revision$"); printf ("Copyright (c) 1999 Ethan Galstad (nagios@nagios.org)\n\n" "This plugin tests an UDP connection with the specified host.\n\n"); print_usage (); printf ("Options:\n" " -H, --hostname=ADDRESS\n" " Host name argument for servers using host headers (use numeric\n" " address if possible to bypass DNS lookup).\n" " -p, --port=INTEGER\n" " Port number\n" " -e, --expect=STRING \n" " String to expect in first line of server response\n" " -s, --send=STRING \n" " String to send to the server when initiating the connection\n" " -w, --warning=INTEGER \n" " Response time to result in warning status (seconds)\n" " -c, --critical=INTEGER \n" " Response time to result in critical status (seconds)\n" " -t, --timeout=INTEGER \n" " Seconds before connection times out (default: %d)\n" " -v, --verbose \n" " Show details for command-line debugging (do not use with nagios server)\n" " -h, --help\n" " Print detailed help screen and exit\n" " -V, --version\n" " Print version information and exit\n", DEFAULT_SOCKET_TIMEOUT); }