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Diffstat (limited to 'plugins/check_udp.c')
| -rw-r--r-- | plugins/check_udp.c | 315 |
1 files changed, 315 insertions, 0 deletions
diff --git a/plugins/check_udp.c b/plugins/check_udp.c new file mode 100644 index 00000000..d00ce9c3 --- /dev/null +++ b/plugins/check_udp.c @@ -0,0 +1,315 @@ +/****************************************************************************** +* +* 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 <host_address> [-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" + +#define 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 **); +int call_getopt (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 = NULL; + +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; + + 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"); + } + + c = 0; + while ((c += call_getopt (argc - c, &argv[c])) < argc) { + + if (is_option (argv[c])) + continue; + + if (server_address == NULL) { + if (argc > c) { + if (is_host (argv[c]) == FALSE) + usage ("Invalid host name/address\n"); + server_address = argv[c]; + } + else { + usage ("Host name was not supplied\n"); + } + } + } + + if (server_send == NULL) + server_send = strscpy (server_send, ""); + + return OK; +} + + + + + +int +call_getopt (int argc, char **argv) +{ + int c, i = 0; + +#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 + + 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 + + i++; + + if (c == -1 || c == EOF || c == 1) + break; + + switch (c) { + case 'H': + case 'c': + case 'w': + case 't': + case 'p': + case 'e': + case 's': + i++; + } + + switch (c) { + case '?': /* print short usage statement if args not parsable */ + printf ("%s: Unknown argument: %s\n\n", my_basename (argv[0]), optarg); + print_usage (); + exit (STATE_UNKNOWN); + case 'h': /* help */ + print_help (); + exit (STATE_OK); + case 'V': /* version */ + print_revision (my_basename (argv[0]), "$Revision$"); + 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; + } + } + return i; +} + + + + + +void +print_usage (void) +{ + printf + ("Usage: %s -H <host_address> [-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 <optional>\n" + " String to expect in first line of server response\n" + " -s, --send=STRING <optional>\n" + " String to send to the server when initiating the connection\n" + " -w, --warning=INTEGER <optional>\n" + " Response time to result in warning status (seconds)\n" + " -c, --critical=INTEGER <optional>\n" + " Response time to result in critical status (seconds)\n" + " -t, --timeout=INTEGER <optional>\n" + " Seconds before connection times out (default: %d)\n" + " -v, --verbose <optional>\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); +} |