contrib/check_sockets.pl

   1 #! /usr/bin/perl
   2 # ------------------------------------------------------------------------------
   3 # File Name:            check_sockets.pl
   4 # Author:               Richard Mayhew - South Africa
   5 # Date:                 2000/07/11
   6 # Version:              1.0
   7 # Description:          This script will check to see how may open sockets
   8 #                       a server has and waron respectivly
   9 # Email:                netsaint@splash.co.za
  10 # ------------------------------------------------------------------------------
  11 # Copyright 1999 (c) Richard Mayhew
  12 # Credits go to Ethan Galstad for coding Nagios
  13 # If any changes are made to this script, please mail me a copy of the
  14 # changes :)
  15 # Some code taken from Charlie Cook (check_disk.pl)
  16 # License GPL
  17 #
  18 # ------------------------------------------------------------------------------
  19 # Date          Author          Reason
  20 # ----          ------          ------
  21 # 1999/09/20    RM              Creation
  22 # 1999/09/20    TP              Changed script to use strict, more secure by
  23 #                               specifying $ENV variables. The bind command is
  24 #                               still insecure through.  Did most of my work
  25 #                               with perl -wT and 'use strict'
  26 #
  27 # ------------------------------------------------------------------------------
  28
  29 # -----------------------------------------------------------------[ Require ]--
  30 require 5.004;
  31 # --------------------------------------------------------------------[ Uses ]--
  32 use Socket;
  33 use strict;
  34 # --------------------------------------------------------------[ Enviroment ]--
  35 $ENV{'PATH'}='/bin:/sbin:/usr/bin:/usr/sbin';
  36 $ENV{BASH_ENV} = "";
  37 # ------------------------------------------------------------------[ Global ]--
  38 my $TIMEOUT = 20;
  39 my %ERRORS = (
  40         'UNKNOWN', '-1',
  41         'OK', '0',
  42         'WARNING', '1',
  43         'CRITICAL', '2');
  44 # --------------------------------------------------------------[ connection ]--
  45 sub connection
  46 {
  47         my ($in_total,$in_warn,$in_crit,$in_high) = @_;
  48         my $state;
  49         my $answer;
  50
  51         $in_total =~ s/\ //g;
  52         if ($in_total >= 0) {
  53
  54                 if ($in_total > $in_crit) {
  55                         $state = "CRITICAL";
  56                         $answer = "Critical Number Of Sockets Connected : $in_total (Limit = $in_crit)\n";
  57
  58                 } elsif ($in_total > $in_warn) {
  59                         $state = "WARNING";
  60                         $answer = "Warning Number Of Sockets Connected : $in_total (Limit = $in_warn)\n";
  61
  62                 } else {
  63                         if ($in_high ne "") {
  64                         $answer = "Sockets OK - Current Sockets: $in_total : $in_high\n";
  65                         }
  66                         if ($in_high eq "") {
  67                         $answer = "Sockets OK - Current Sockets: $in_total\n";
  68                         }
  69                         $state = "OK";
  70                         }
  71
  72         } else {
  73                 $state = "UNKNOWN";
  74                 $answer = "Something is Really WRONG! Sockets Is A Negative Figure!\n";
  75         }
  76
  77         print $answer;
  78         exit $ERRORS{$state};
  79 }
  80
  81 # -------------------------------------------------------------------[ usage ]--
  82 sub usage
  83 {
  84         print "Minimum arguments not supplied!\n";
  85         print "\n";
  86         print "Perl Check Sockets plugin for Nagios\n";
  87         print "Copyright (c) 2000 Richard Mayhew\n";
  88         print "\n";
  89         print "Usage: check_sockets.pl <type> <warn> <crit>\n";
  90         print "\n";
  91         print "<type> = TOTAL, TCP, UDP, RAW.\n";
  92         print "<warn> = Number of sockets connected at which a warning message will be generated.[Default = 256]\n";
  93         print "<crit> = Number of sockets connected at which a critical message will be generated.[Default = 512]\n";
  94         exit $ERRORS{"UNKNOWN"};
  95
  96 }
  97
  98 # ====================================================================[ MAIN ]==
  99 MAIN:
 100 {
 101         my $type = shift || &usage;
 102         my $warn = shift || 256;
 103         my $crit = shift || 512;
 104         my $data;
 105         my @data;
 106         my $line;
 107         my $data1;
 108         my $data2;
 109         my $data3;
 110         my $junk;
 111         my $total1;
 112         my $total2;
 113         $type = uc $type;
 114         if ($type eq "TOTAL") {
 115         $type = "sockets";
 116         }
 117
 118         # Just in case of problems, let's not hang Nagios
 119         $SIG{'ALRM'} = sub {
 120                 print "Somthing is Taking a Long Time, Increase Your TIMEOUT (Currently Set At $TIMEOUT Seconds)\n";
 121                 exit $ERRORS{"UNKNOWN"};
 122         };
 123
 124         $data = `/bin/cat /proc/net/sockstat`;
 125         @data = split("\n",$data);
 126         alarm($TIMEOUT);
 127         my $output = "";
 128         my $high;
 129
 130
 131         foreach $line (@data) {
 132                 if ($line =~ /$type/) {
 133                 ($data1,$data2,$data3) = split(" ",$line,3);
 134
 135                         if ($data3 =~ /highest/){
 136                         ($total1,$junk,$total2) = split(" ",$data3,3);
 137                         $output = $total1;
 138                         $high = $total2;
 139                         }
 140                         else {$output = $data3;}
 141         alarm(0);
 142         connection($output,$warn,$crit,$high);
 143                 }
 144         }
 145 }