plugins/check_udp.c

   1 /******************************************************************************
   2
   3  This program is free software; you can redistribute it and/or modify
   4  it under the terms of the GNU General Public License as published by
   5  the Free Software Foundation; either version 2 of the License, or
   6  (at your option) any later version.
   7
   8  This program is distributed in the hope that it will be useful,
   9  but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11  GNU General Public License for more details.
  12
  13  You should have received a copy of the GNU General Public License
  14  along with this program; if not, write to the Free Software
  15  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  16
  17 *****************************************************************************/
  18
  19 const char *progname = "check_udp";
  20 const char *revision = "$Revision$";
  21 const char *copyright = "1999-2002";
  22 const char *email = "nagiosplug-devel@lists.sourceforge.net";
  23
  24 #include "common.h"
  25 #include "netutils.h"
  26 #include "utils.h"
  27
  28 /* Original Command line:
  29    check_udp <host_address> [-p port] [-s send] [-e expect] \
  30    [-wt warn_time] [-ct crit_time] [-to to_sec] */
  31 void
  32 print_usage (void)
  33 {
  34         printf (_("\
  35 Usage: %s -H <host_address> [-p port] [-w warn_time] [-c crit_time]\n\
  36     [-e expect] [-s send] [-t to_sec] [-v]\n"), progname);
  37         printf (_(UT_HLP_VRS), progname, progname);
  38 }
  39
  40 void
  41 print_help (void)
  42 {
  43         print_revision (progname, revision);
  44
  45         printf (_("Copyright (c) 1999 Ethan Galstad\n"));
  46         printf (_(COPYRIGHT), copyright, email);
  47
  48         printf (_("\
  49 This plugin tests an UDP connection with the specified host.\n\n"));
  50
  51         print_usage ();
  52
  53         printf (_(UT_HELP_VRSN));
  54
  55         printf (_(UT_HOST_PORT), 'p', "none");
  56
  57         printf (_("\
  58  -e, --expect=STRING <optional>\n\
  59     String to expect in first line of server response\n\
  60  -s, --send=STRING <optional>\n\
  61     String to send to the server when initiating the connection\n"));
  62
  63         printf (_(UT_WARN_CRIT));
  64
  65         printf (_(UT_TIMEOUT), DEFAULT_SOCKET_TIMEOUT);
  66
  67         printf (_(UT_VERBOSE));
  68
  69         printf (_("\
  70 This plugin will attempt to connect to the specified port on the host.\n\
  71 Successful connects return STATE_OK, refusals and timeouts return\n\
  72 STATE_CRITICAL, other errors return STATE_UNKNOWN.\n\n"));
  73
  74         printf(_(UT_SUPPORT));
  75 }
  76 \f
  77 int process_arguments (int, char **);
  78
  79 int warning_time = 0;
  80 int check_warning_time = FALSE;
  81 int critical_time = 0;
  82 int check_critical_time = FALSE;
  83 int verbose = FALSE;
  84 int server_port = 0;
  85 char *server_address = NULL;
  86 char *server_expect = NULL;
  87 char *server_send = "";
  88
  89 int
  90 main (int argc, char **argv)
  91 {
  92         int result;
  93         char recv_buffer[MAX_INPUT_BUFFER];
  94
  95         if (process_arguments (argc, argv) == ERROR)
  96                 usage ("\n");
  97
  98         /* initialize alarm signal handling */
  99         signal (SIGALRM, socket_timeout_alarm_handler);
 100
 101         /* set socket timeout */
 102         alarm (socket_timeout);
 103
 104         time (&start_time);
 105         result = process_udp_request (server_address, server_port, server_send,
 106                         recv_buffer, MAX_INPUT_BUFFER - 1);
 107         time (&end_time);
 108
 109         if (result != STATE_OK) {
 110                 printf ("No response from host on port %d\n", server_port);
 111                 result = STATE_CRITICAL;
 112         }
 113
 114         else {
 115
 116                 /* check to see if we got the response we wanted */
 117                 if (server_expect) {
 118                         if (!strstr (recv_buffer, server_expect)) {
 119                                 printf ("Invalid response received from host on port %d\n",
 120                                                                 server_port);
 121                                 result = STATE_CRITICAL;
 122                         }
 123                 }
 124         }
 125
 126         /* we connected, so close connection before exiting */
 127         if (result == STATE_OK) {
 128
 129                 if (check_critical_time == TRUE
 130                                 && (end_time - start_time) > critical_time) result = STATE_CRITICAL;
 131                 else if (check_warning_time == TRUE
 132                                                  && (end_time - start_time) > warning_time) result =
 133                                 STATE_WARNING;
 134
 135                 printf (_("Connection %s on port %d - %d second response time\n"),
 136                                                 (result == STATE_OK) ? _("accepted") : _("problem"), server_port,
 137                                                 (int) (end_time - start_time));
 138         }
 139
 140         /* reset the alarm */
 141         alarm (0);
 142
 143         return result;
 144 }
 145
 146
 147
 148
 149 /* process command-line arguments */
 150 int
 151 process_arguments (int argc, char **argv)
 152 {
 153         int c;
 154
 155         int option_index = 0;
 156         static struct option long_options[] = {
 157                 {"hostname", required_argument, 0, 'H'},
 158                 {"critical", required_argument, 0, 'c'},
 159                 {"warning", required_argument, 0, 'w'},
 160                 {"timeout", required_argument, 0, 't'},
 161                 {"port", required_argument, 0, 'p'},
 162                 {"expect", required_argument, 0, 'e'},
 163                 {"send", required_argument, 0, 's'},
 164                 {"verbose", no_argument, 0, 'v'},
 165                 {"version", no_argument, 0, 'V'},
 166                 {"help", no_argument, 0, 'h'},
 167                 {0, 0, 0, 0}
 168         };
 169
 170         if (argc < 2)
 171                 usage ("\n");
 172
 173         for (c = 1; c < argc; c++) {
 174                 if (strcmp ("-to", argv[c]) == 0)
 175                         strcpy (argv[c], "-t");
 176                 else if (strcmp ("-wt", argv[c]) == 0)
 177                         strcpy (argv[c], "-w");
 178                 else if (strcmp ("-ct", argv[c]) == 0)
 179                         strcpy (argv[c], "-c");
 180         }
 181
 182         while (1) {
 183                 c = getopt_long (argc, argv, "+hVvH:e:s:c:w:t:p:", long_options, &option_index);
 184
 185                 if (c == -1 || c == EOF || c == 1)
 186                         break;
 187
 188                 switch (c) {
 189                 case '?':                                                                       /* print short usage statement if args not parsable */
 190                         printf (_("%s: Unknown argument: %s\n\n"), progname, optarg);
 191                         print_usage ();
 192                         exit (STATE_UNKNOWN);
 193                 case 'h':                                                                       /* help */
 194                         print_help ();
 195                         exit (STATE_OK);
 196                 case 'V':                                                                       /* version */
 197                         print_revision (progname, revision);
 198                         exit (STATE_OK);
 199                 case 'v':                                                                       /* verbose mode */
 200                         verbose = TRUE;
 201                         break;
 202                 case 'H':                                                                       /* hostname */
 203                         if (is_host (optarg) == FALSE)
 204                                 usage (_("Invalid host name/address\n"));
 205                         server_address = optarg;
 206                         break;
 207                 case 'c':                                                                       /* critical */
 208                         if (!is_intnonneg (optarg))
 209                                 usage (_("Critical threshold must be a nonnegative integer\n"));
 210                         critical_time = atoi (optarg);
 211                         check_critical_time = TRUE;
 212                         break;
 213                 case 'w':                                                                       /* warning */
 214                         if (!is_intnonneg (optarg))
 215                                 usage (_("Warning threshold must be a nonnegative integer\n"));
 216                         warning_time = atoi (optarg);
 217                         check_warning_time = TRUE;
 218                         break;
 219                 case 't':                                                                       /* timeout */
 220                         if (!is_intnonneg (optarg))
 221                                 usage (_("Timeout interval must be a nonnegative integer\n"));
 222                         socket_timeout = atoi (optarg);
 223                         break;
 224                 case 'p':                                                                       /* port */
 225                         if (!is_intnonneg (optarg))
 226                                 usage (_("Server port must be a nonnegative integer\n"));
 227                         server_port = atoi (optarg);
 228                         break;
 229                 case 'e':                                                                       /* expect */
 230                         server_expect = optarg;
 231                         break;
 232                 case 's':                                                                       /* send */
 233                         server_send = optarg;
 234                         break;
 235                 }
 236         }
 237
 238         c = optind;
 239         if (server_address == NULL && c < argc && argv[c]) {
 240                 if (is_host (argv[c]) == FALSE)
 241                         usage (_("Invalid host name/address\n"));
 242                 server_address = argv[c++];
 243         }
 244
 245         if (server_address == NULL)
 246                 usage (_("Host name was not supplied\n"));
 247
 248         return c;
 249 }