/usr/lib/nagios/plugins/check_rbl is in nagios-plugins-contrib 9.20140106.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
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# nagios: -epn
package main;
# check_rbl is a Nagios plugin to check if an SMTP server is black- or
# white- listed
#
# See the INSTALL file for installation instructions
#
# Copyright (c) 2007, ETH Zurich.
# Copyright (c) 2010, Elan Ruusamae <glen@delfi.ee>.
#
# This module is free software; you can redistribute it and/or modify it
# under the terms of GNU general public license (gpl) version 3.
# See the LICENSE file for details.
#
# RCS information
# enable substitution with:
# $ svn propset svn:keywords "Id Revision HeadURL Source Date"
#
# $Id: check_rbl 1344 2013-09-26 06:26:05Z corti $
# $Revision: 1344 $
# $HeadURL: https://svn.id.ethz.ch/nagios_plugins/check_rbl/check_rbl $
# $Date: 2013-09-26 08:26:05 +0200 (Thu, 26 Sep 2013) $
use strict;
use warnings;
use 5.00800;
use IO::Select;
use Nagios::Plugin 0.31;
use Nagios::Plugin::Getopt;
use Nagios::Plugin::Threshold;
use Net::DNS;
use Readonly;
our $VERSION = '1.3.1';
Readonly our $DEFAULT_RETRIES => 4;
Readonly our $DEFAULT_WORKERS => 20;
Readonly our $DEFAULT_QUERY_TIMEOUT => 15;
# IMPORTANT: Nagios plugins could be executed using embedded perl in this case
# the main routine would be executed as a subroutine and all the
# declared subroutines would therefore be inner subroutines
# This will cause all the global lexical variables not to stay shared
# in the subroutines!
#
# All variables are therefore declared as package variables...
#
## no critic (ProhibitPackageVars)
our ( @listed, @timeouts, $ip, $options, $plugin, $threshold, $res,
$timeouts_string, );
# the script is declared as a package so that it can be unit tested
# but it should not be used as a module
if ( !caller ) {
run();
}
##############################################################################
# subroutines
##############################################################################
# Usage : verbose("some message string", $optional_verbosity_level);
# Purpose : write a message if the verbosity level is high enough
# Returns : n/a
# Arguments : message : message string
# level : options verbosity level
# Throws : n/a
# Comments : n/a
# See also : n/a
sub verbose {
# arguments
my $message = shift;
my $level = shift;
if ( !defined $message ) {
$plugin->nagios_exit( UNKNOWN,
q{Internal error: not enough parameters for 'verbose'} );
}
if ( !defined $level ) {
$level = 0;
}
if ( $level < $options->verbose ) {
if ( !print $message ) {
$plugin->nagios_exit( UNKNOWN, 'Error: cannot write to STDOUT' );
}
}
return;
}
##############################################################################
# Usage : mdns(\@addresses, $callback)
# Purpose : Perform multiple DNS lookups in parallel
# Returns : n/a
# See also : Perl Net::DNS module mresolv in examples
#
# Resolves all IPs in C<@addresses> in parallel.
# If answer is found C<$callback> is called with arguments as: $name, $host.
#
# Author: Elan Ruusamae <glen@delfi.ee>, (c) 1999-2010
## no critic (ProhibitExcessComplexity)
sub mdns {
my ( $data, $callback ) = @_;
# number of requests to have outstanding at any time
my $workers = $options->workers();
# timeout per query (seconds)
my $timeout = $options->get('query-timeout');
my $debug = $options->debug();
my $sel = IO::Select->new();
my $eof = 0;
my @addrs = @{$data};
my %addrs;
while (1) {
#----------------------------------------------------------------------
# Read names until we've filled our quota of outstanding requests.
#----------------------------------------------------------------------
while ( !$eof && $sel->count() < $workers ) {
if ($debug) {
## no critic (RequireCheckedSyscall)
print 'DEBUG: reading...';
}
my $name = shift @addrs;
if ( !defined $name ) {
if ($debug) {
## no critic (RequireCheckedSyscall)
print "EOF.\n";
}
$eof = 1;
last;
}
if ($debug) {
## no critic (RequireCheckedSyscall)
print "NAME: $name\n";
}
my $sock = $res->bgsend($name);
if ( !defined $sock ) {
verbose 'DNS query error: ' . $res->errorstring;
verbose "Skipping $name";
}
else {
# we store in a hash the query we made, as parsing it back from
# response gives different ip for ips with multiple hosts
$addrs{$sock} = $name;
$sel->add($sock);
if ($debug) {
## no critic (RequireCheckedSyscall)
print "DEBUG: name = $name, outstanding = ", $sel->count(),
"\n";
}
}
}
#----------------------------------------------------------------------
# Wait for any replies. Remove any replies from the outstanding pool.
#----------------------------------------------------------------------
my @ready;
my $timed_out = 1;
if ($debug) {
## no critic (RequireCheckedSyscall)
print "DEBUG: waiting for replies\n";
}
@ready = $sel->can_read($timeout);
while (@ready) {
$timed_out = 0;
if ($debug) {
## no critic (RequireCheckedSyscall)
print 'DEBUG: replies received: ', scalar @ready, "\n";
}
foreach my $sock (@ready) {
if ($debug) {
## no critic (RequireCheckedSyscall)
print "DEBUG: handling a reply\n";
}
my $addr = $addrs{$sock};
delete $addrs{$sock};
$sel->remove($sock);
my $ans = $res->bgread($sock);
my $host;
if ($ans) {
foreach my $rr ( $ans->answer ) {
## no critic(ProhibitDeepNests)
if ( !( $rr->type eq 'A' ) ) {
next;
}
$host = $rr->address;
# take just the first answer
last;
}
}
else {
if ($debug) {
## no critic (RequireCheckedSyscall)
print 'DEBUG: no answer: ' . $res->errorstring() . "\n";
}
}
&{$callback}( $addr, $host );
}
@ready = $sel->can_read(0);
}
#----------------------------------------------------------------------
# If we timed out waiting for replies, remove all entries from the
# outstanding pool.
#----------------------------------------------------------------------
if ($timed_out) {
if ($debug) {
## no critic (RequireCheckedSyscall)
print "DEBUG: timeout: clearing the outstanding pool.\n";
}
foreach my $sock ( $sel->handles() ) {
my $addr = $addrs{$sock};
delete $addrs{$sock};
$sel->remove($sock);
# callback for hosts that timed out
&{$callback}( $addr, q{} );
}
}
if ($debug) {
## no critic (RequireCheckedSyscall)
print 'DEBUG: outstanding = ', $sel->count(), ", eof = $eof\n";
}
#----------------------------------------------------------------------
# We're done if there are no outstanding queries and we've read EOF.
#----------------------------------------------------------------------
last if ( $sel->count() == 0 ) && $eof;
}
return;
}
##############################################################################
# Usage : run();
# Purpose : main method
# Returns : n/a
# Arguments : n/a
# Throws : n/a
# Comments : n/a
# See also : n/a
sub run {
################################################################################
# Initialization
$plugin = Nagios::Plugin->new( shortname => 'CHECK_RBL' );
my $time = time;
########################
# Command line arguments
$options = Nagios::Plugin::Getopt->new(
usage => 'Usage: %s [OPTIONS]',
version => $VERSION,
url => 'https://trac.id.ethz.ch/projects/nagios_plugins',
blurb => 'Check SMTP blakl- or white- isting status',
);
$options->arg(
spec => 'critical|c=i',
help => 'Number of blacklisting servers for a critical warning',
required => 0,
default => 0,
);
$options->arg(
spec => 'warning|w=i',
help => 'Number of blacklisting servers for a warning',
required => 0,
default => 0,
);
$options->arg(
spec => 'debug|d',
help => 'Prints debugging information',
required => 0,
default => 0,
);
$options->arg(
spec => 'server|s=s@',
help => 'RBL server',
required => 1,
);
$options->arg(
spec => 'host|H=s',
help => 'SMTP server to check',
required => 1,
);
$options->arg(
spec => 'retry|r=i',
help => 'Number of times to try a DNS query (default is 4) ',
required => 0,
default => $DEFAULT_RETRIES,
);
$options->arg(
spec => 'workers=i',
help => 'Number of parallel checks',
required => 0,
default => $DEFAULT_WORKERS,
);
$options->arg(
spec => 'whitelistings|wl',
help => 'Check whitelistings instead of blacklistings',
required => 0,
default => 0,
);
$options->arg(
spec => 'query-timeout=i',
help => 'Timeout of the RBL queries',
required => 0,
default => $DEFAULT_QUERY_TIMEOUT,
);
$options->getopts();
###############
# Sanity checks
if ( $options->critical < $options->warning ) {
$plugin->nagios_exit( UNKNOWN,
'critical has to be greater or equal warning' );
}
$res = Net::DNS::Resolver->new();
if ( $res->can('force_v4') ) {
$res->force_v4(1);
}
$res->retry( $options->retry() );
$ip = $options->host;
if ( $ip =~ m/[[:lower:]]/mxs ) {
mdns(
[ $options->host ],
sub {
my ( $addr, $host ) = @_;
$ip = $host;
}
);
}
if ( !$ip ) {
$plugin->nagios_exit( UNKNOWN, 'Cannot resolve ' . $options->host );
}
verbose 'Using ' . $options->timeout . " as global script timeout\n";
alarm $options->timeout;
################
# Set the limits
$threshold = Nagios::Plugin::Threshold->set_thresholds(
warning => $options->warning,
critical => $options->critical,
);
################################################################################
my @servers = @{ $options->server };
my $nservers = scalar @servers;
verbose 'Checking ' . $options->host . " ($ip) on $nservers server(s)\n";
# build address lists
my @addrs;
foreach my $server (@servers) {
( my $local_ip = $ip ) =~
s/(\d{1,3}) [.] (\d{1,3}) [.] (\d{1,3}) [.] (\d{1,3})/$4.$3.$2.$1.$server/mxs;
push @addrs, $local_ip;
}
mdns(
\@addrs,
sub {
my ( $addr, $host ) = @_;
# extract RBL we checked
$addr =~ s/^(?:\d+[.]){4}//mxs;
if ( defined $host ) {
if ( $host eq q{} ) {
push @timeouts, $addr;
}
else {
verbose "listed in $addr as $host\n";
if ( !$options->get('whitelistings') ) {
push @listed, $addr;
}
}
}
else {
verbose "not listed in $addr\n";
if ( $options->get('whitelistings') ) {
push @listed, $addr;
}
}
}
);
my $total = scalar @listed;
my $status;
if ( $options->get('whitelistings') ) {
$status =
$options->host
. " NOT WHITELISTED on $total "
. ( ( $total == 1 ) ? 'server' : 'servers' )
. " of $nservers";
}
else {
$status =
$options->host
. " BLACKLISTED on $total "
. ( ( $total == 1 ) ? 'server' : 'servers' )
. " of $nservers";
}
# append timeout info, but do not account these in status
if (@timeouts) {
$timeouts_string = scalar @timeouts;
$status =
" ($timeouts_string server"
. ( ( $timeouts_string > 1 ) ? 's' : q{} )
. ' timed out: '
. join( ', ', @timeouts ) . ')';
}
if ( $total > 0 ) {
$status .= " (@listed)";
}
$plugin->add_perfdata(
label => 'servers',
value => $total,
uom => q{},
threshold => $threshold,
);
$plugin->add_perfdata(
label => 'time',
value => time - $time,
uom => q{s},
);
$plugin->nagios_exit( $threshold->get_status($total), $status );
return;
}
1;
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