contrib/check_traceroute-pure_perl.pl

   1 #!/usr/bin/perl -Wall
   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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  16 #
  17 #
  18 # check_traceroute is designed to generate and alarm if a traceroute exceeds
  19 # a certain number of hops. This is useful in cases where a multi-homed
  20 # network looses a connection and can still ping the remote end because
  21 # traffic is being re-routed out through the redundent connection.
  22 #
  23 # check_traceroute v0.1
  24 # By mp@xmission.com
  25 #
  26 # Thanks to Sebastian Hetze, Linux Information Systems AG who wrote the
  27 # excellent check_apache plugin, which this plugin was modeled after.
  28 #
  29 #############################################################################
  30
  31 use strict;
  32 use Net::Traceroute;
  33 use Getopt::Long;
  34
  35 my $version = "v0.1";
  36 my $opt_v;
  37 my $opt_t=undef; #for usage () unless ($opt_t) to work right
  38 my $opt_help;
  39 my $opt_w;
  40 my $opt_c;
  41
  42 my %ERRORS = ('UNKNOWN' , '-1',
  43               'OK' , '0',
  44               'WARNING', '1',
  45               'CRITICAL', '2');
  46 # Set this to whatever you like, but make sure you don't hang Nagios
  47 # for too long.
  48 my $timeout = "30";
  49
  50 GetOptions
  51         ("v"   => \$opt_v, "t=s"        => \$opt_t,
  52         "help"  => \$opt_help, "h"      => \$opt_help,
  53         "w=i"   => \$opt_w, "c=i"       => \$opt_c
  54         );
  55
  56 if ($opt_v) {
  57         print "\nThis is check_traceroute version $version\n";
  58         print "\n";
  59         print "Please report errors to mp\@xmission\.com";
  60         print "\n\n";
  61         }
  62
  63 #subs
  64 sub print_help () {
  65         print "\n\nThis is check_traceroute.pl. It is designed to send an alert\n";
  66         print "to Nagios if a route to a particular destination exceeds a\n";
  67         print "certain number of hops.\n\n";
  68         print "Usage:\n";
  69         print "\n";
  70         print "--help Display this help.\n";
  71         print "-v Display the version number of check_traceroute.\n";
  72         print "-t Host that you wish to traceroute to.\n";
  73         print "-w Number of hops before Nagios generates a WARNING.\n";
  74         print "-c Number of hops before Nagios generates a CRITICAL.\n";
  75         }
  76
  77 sub usage() {
  78         print "check_traceroute -t <host> [-w <warning>] [-c <critical>]\n";
  79         }
  80
  81 sub do_check() {
  82         if ($opt_t) {
  83                 unless ($opt_w && $opt_c) {die "You must specify thresholds using -c and -w\n";}
  84                 my $tr = Net::Traceroute->new(host=>"$opt_t") || die "Can't init traceroute!\n";
  85                 if($tr->found) {
  86                         my $hops = $tr->hops;
  87                         if($hops > $opt_w) {
  88                                 print "Warning: $opt_t is $hops hops away!\n";
  89                                 exit $ERRORS{'WARNING'};
  90                         }
  91                         elsif($hops > $opt_c) {
  92                                 print "Critical: $opt_t is $hops hops away!\n";
  93                                 exit $ERRORS{'CRITICAL'};
  94                         }
  95                         else {
  96                                 print "OK: $opt_t is $hops hops away\n";
  97                                 exit $ERRORS{'OK'};
  98                                 }
  99                 }
 100                 else {
 101                         print "Couldn't locate host $opt_t!\n";
 102                         exit $ERRORS{'UNKNOWN'};
 103                 }
 104         }
 105         }
 106
 107 # Must be placed at the end for -Wall to compile cleanly, blech
 108 if ($opt_help) {
 109         print_help();
 110         }
 111 usage() unless ($opt_t);
 112 #timeoutes
 113 $SIG{'ALRM'} = sub {
 114      print ("ERROR: No response from $opt_t (timeout) in $timeout seconds\n");
 115           exit $ERRORS{"UNKNOWN"};
 116           };
 117           alarm($timeout);
 118 do_check();
 119