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#!/usr/bin/perl -Wall
#
# 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
#
#
# check_traceroute is designed to generate and alarm if a traceroute exceeds
# a certain number of hops. This is useful in cases where a multi-homed
# network looses a connection and can still ping the remote end because
# traffic is being re-routed out through the redundent connection.
#
# check_traceroute v0.1
# By mp@xmission.com
#
# Thanks to Sebastian Hetze, Linux Information Systems AG who wrote the
# excellent check_apache plugin, which this plugin was modeled after.
#
#############################################################################
use strict;
use Net::Traceroute;
use Getopt::Long;
my $version = "v0.1";
my $opt_v;
my $opt_t=undef; #for usage () unless ($opt_t) to work right
my $opt_help;
my $opt_w;
my $opt_c;
my %ERRORS = ('UNKNOWN' , '-1',
'OK' , '0',
'WARNING', '1',
'CRITICAL', '2');
# Set this to whatever you like, but make sure you don't hang Nagios
# for too long.
my $timeout = "30";
GetOptions
("v" => \$opt_v, "t=s" => \$opt_t,
"help" => \$opt_help, "h" => \$opt_help,
"w=i" => \$opt_w, "c=i" => \$opt_c
);
if ($opt_v) {
print "\nThis is check_traceroute version $version\n";
print "\n";
print "Please report errors to mp\@xmission\.com";
print "\n\n";
}
#subs
sub print_help () {
print "\n\nThis is check_traceroute.pl. It is designed to send an alert\n";
print "to Nagios if a route to a particular destination exceeds a\n";
print "certain number of hops.\n\n";
print "Usage:\n";
print "\n";
print "--help Display this help.\n";
print "-v Display the version number of check_traceroute.\n";
print "-t Host that you wish to traceroute to.\n";
print "-w Number of hops before Nagios generates a WARNING.\n";
print "-c Number of hops before Nagios generates a CRITICAL.\n";
}
sub usage() {
print "check_traceroute -t <host> [-w <warning>] [-c <critical>]\n";
}
sub do_check() {
if ($opt_t) {
unless ($opt_w && $opt_c) {die "You must specify thresholds using -c and -w\n";}
my $tr = Net::Traceroute->new(host=>"$opt_t") || die "Can't init traceroute!\n";
if($tr->found) {
my $hops = $tr->hops;
if($hops > $opt_w) {
print "Warning: $opt_t is $hops hops away!\n";
exit $ERRORS{'WARNING'};
}
elsif($hops > $opt_c) {
print "Critical: $opt_t is $hops hops away!\n";
exit $ERRORS{'CRITICAL'};
}
else {
print "OK: $opt_t is $hops hops away\n";
exit $ERRORS{'OK'};
}
}
else {
print "Couldn't locate host $opt_t!\n";
exit $ERRORS{'UNKNOWN'};
}
}
}
# Must be placed at the end for -Wall to compile cleanly, blech
if ($opt_help) {
print_help();
}
usage() unless ($opt_t);
#timeoutes
$SIG{'ALRM'} = sub {
print ("ERROR: No response from $opt_t (timeout) in $timeout seconds\n");
exit $ERRORS{"UNKNOWN"};
};
alarm($timeout);
do_check();
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