From e3ec1428d5cb530bdf09fc0d75477977c17a1a12 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?P=C3=A1ll=20Gu=C3=B0j=C3=B3n=20Sigur=C3=B0sson?= Date: Wed, 3 Mar 2010 21:42:19 +0000 Subject: [PATCH] check_bl added (check blacklist) --- check_bl/trunk/COPYING | 280 ++++++++++++++++++++++++++++++++++++++++ check_bl/trunk/README | 44 +++++++ check_bl/trunk/check_bl | 160 +++++++++++++++++++++++ 3 files changed, 484 insertions(+) create mode 100644 check_bl/trunk/COPYING create mode 100644 check_bl/trunk/README create mode 100755 check_bl/trunk/check_bl diff --git a/check_bl/trunk/COPYING b/check_bl/trunk/COPYING new file mode 100644 index 0000000..960fe74 --- /dev/null +++ b/check_bl/trunk/COPYING @@ -0,0 +1,280 @@ + GNU GENERAL PUBLIC LICENSE + Version 2, June 1991 + + Copyright (C) 1989, 1991 Free Software Foundation, Inc. + 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + Everyone is permitted to copy and distribute verbatim copies + of this license document, but changing it is not allowed. + + Preamble + + The licenses for most software are designed to take away your +freedom to share and change it. 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Licensed under the GNU GPL v2.0 or later (at your option). For +full copyright and warranty details, please see the COPYING file included in +this package. + +By Sam Bashton, Bashton Ltd - sam@bashton.com www.bashton.com + +Comments, bug reports etc are welcome. + +Pre-Requisites +-------------- + +- Working Nagios install +- Perl 5 (tested with Perl 5.6.1 and 5.8) +- Net::DNS Perl library and associated dependencies + +Installation +------------ + +- Copy to your nagios plugins directory (possibly /usr/lib/nagios/plugins) +- Add the following to your checkcommands.cfg: + +define command{ + command_name check_bl + command_line $USER1$/check_bl -H $HOSTADDRESS$ -B sbl-xbl.spamhaus.or +g,bl.spamcop.net,t1.dnsbl.net.au +} + +- Alter your services.cfg to include a check against the check_bl command + +Variables +--------- + +check_bl requires the following variables: + +-H host : Hostname to check +-B blacklist1,blacklist2 : Comma separated list of blacklists to check against + +The following optional variable is also available: + +-c critnum : Number of blacklists the server must be listed in before the status is 'critical'. By default, any listing is regarded as critical. diff --git a/check_bl/trunk/check_bl b/check_bl/trunk/check_bl new file mode 100755 index 0000000..f0632d2 --- /dev/null +++ b/check_bl/trunk/check_bl @@ -0,0 +1,160 @@ +#!/usr/bin/perl -w +# +# check_bl plugin for nagios +# $Revision: 1.0 $ +# +# Nagios plugin designed to warn you if you mail servers appear in one of the +# many anti-spam 'blacklists' +# +# By Sam Bashton, Bashton Ltd +# bashton.com/content/nagios-plugins +# +# 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 + +use strict; +use lib "/usr/lib/nagios/plugins"; +use utils qw($TIMEOUT %ERRORS &print_revision &support); +use Net::DNS; +use vars qw($PROGNAME); +my ($verbose,$host),; +my ($opt_V,$opt_h,$opt_B,$opt_H,$opt_c); +$opt_V = $opt_h = $opt_B = $opt_H = $opt_c = ''; +my $state = 'UNKNOWN'; +sub print_help(); +sub print_usage(); + +$PROGNAME = "check_bl"; + +$ENV{'BASH_ENV'}=''; +$ENV{'ENV'}=''; +$ENV{'PATH'}=''; +$ENV{'LC_ALL'}='C'; + +use Getopt::Long; +Getopt::Long::Configure('bundling'); +GetOptions( + "V" => \$opt_V, "version" => \$opt_V, + "h" => \$opt_h, "help" => \$opt_h, + "H=s" => \$opt_H, "hostname=s" => \$opt_H, + "B=s" => \$opt_B, "blacklists=s" => \$opt_B, + "c=s" => \$opt_c, "critical=s" => \$opt_c +); + +# -h means display verbose help screen +if ($opt_h) { print_help(); exit $ERRORS{'OK'}; } + +# -V means display version number +if ($opt_V) { + print_revision($PROGNAME,'$Revision: 1.0 $ '); + exit $ERRORS{'OK'}; +} + +# First check the hostname is OK.. +unless ($opt_H) { print_usage(); exit $ERRORS{'UNKNOWN'}; } + +if (! utils::is_hostname($opt_H)){ + print "$opt_H is not a valid host name\n"; + print_usage(); + exit $ERRORS{"UNKNOWN"}; +}else{ + if ($opt_H =~ /[a-zA-Z]/ ) + # If the host contains letters we assume it's a hostname, not an IP + { + $host = lookup($opt_H); + } + else { $host = $opt_H } +} + + +# $opt_c is a count of the blacklists a mail server is in, +# after which state will be CRITICAL rather than WARNING +# By default any listing is CRITICAL +my $critcount = 0; +if ($opt_c) { $critcount = $opt_c }; + +# $opt_B is a comma seperated list of blacklists +$opt_B = shift unless ($opt_B); +unless ($opt_B) { print_usage(); exit -1 } +my @bls = split(/,/, $opt_B); + + +# Just in case of problems, let's not hang Nagios +$SIG{'ALRM'} = sub { + print ("ERROR: No response from BL server (alarm)\n"); + exit $ERRORS{"UNKNOWN"}; +}; +alarm($TIMEOUT); + +my %listed; # Hash of blacklists we're listed in. +foreach(@bls) +{ + if (blcheck($host,$_)) { $listed{$_} = 1 } +} + +if (scalar(keys(%listed)) == 0) { $state = 'OK' } +elsif (scalar(keys(%listed)) < $critcount) { $state = 'WARNING' } +else { $state = 'CRITICAL' } + +if (%listed) +{ + print "Listed at"; + foreach (keys(%listed)) { print " $_" } + print "\n"; +} +else { print "Not black-listed\n" } + +exit $ERRORS{$state}; + + +######## Subroutines ========================== + + +sub print_help() { + print_revision($PROGNAME,'$Revision: 1.0 $ '); + print "\n"; + support(); +} + +sub print_usage () { + print "Usage: \n"; + print " $PROGNAME -H host -B [blacklist1],[blacklist2] [-c critnum]\n"; + print " $PROGNAME [-h | --help]\n"; + print " $PROGNAME [-V | --version]\n"; +} + +sub blcheck +{ + my ($ip, $bl) = @_; + my $lookupip = $ip; + $lookupip =~ + s/([0-9]{1,3})\.([0-9]{1,3})\.([0-9]{1,3})\.([0-9]{1,3})/$4.$3.$2.$1.$bl/; + if (lookup($lookupip)) { return 1 } + else { return 0 } +} + +sub lookup +{ + my $tolookup = shift; + my $res = Net::DNS::Resolver->new; + my $query = $res->search($tolookup); + if ($query) + { + foreach my $rr ($query->answer) + { + next unless $rr->type eq "A"; # We're not interested in TXT records + return $rr->address; + } + } +}