619 lines
16 KiB
Text
619 lines
16 KiB
Text
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#!perl
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# nagios: -epn
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package main;
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# check_rbl is a Nagios plugin to check if an SMTP server is black- or
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# white- listed
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#
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# See the INSTALL file for installation instructions
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#
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# Copyright (c) 2014, Matteo Corti <matteo@corti.li>
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# Copyright (c) 2007, ETH Zurich.
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# Copyright (c) 2010, Elan Ruusamae <glen@delfi.ee>.
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#
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# This module is free software; you can redistribute it and/or modify it
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# under the terms of GNU general public license (gpl) version 3.
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# See the LICENSE file for details.
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use strict;
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use warnings;
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use 5.00800;
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our $VERSION = '1.3.8';
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use Data::Validate::Domain qw(is_hostname);
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use Data::Validate::IP qw(is_ipv4 is_ipv6);
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use IO::Select;
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use Net::DNS;
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use Readonly;
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use English qw(-no_match_vars);
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use Data::Dumper;
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my $plugin_module = load_module( 'Monitoring::Plugin', 'Nagios::Plugin' );
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my $plugin_threshold_module =
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load_module( 'Monitoring::Plugin::Threshold', 'Nagios::Plugin::Threshold' );
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my $plugin_getopt_module =
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load_module( 'Monitoring::Plugin::Getopt', 'Nagios::Plugin::Getopt' );
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# Check which version of the monitoring plugins is available
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sub load_module {
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my @names = @_;
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my $loaded_module;
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for my $name (@names) {
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my $file = $name;
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# requires need either a bare word or a file name
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$file =~ s{::}{/}gsxm;
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$file .= '.pm';
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eval { ## no critic (ErrorHandling::RequireCheckingReturnValueOfEval)
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require $file;
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$name->import();
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};
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if ( !$EVAL_ERROR ) {
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$loaded_module = $name;
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last;
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}
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}
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if ( !$loaded_module ) {
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#<<<
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print 'CHECK_RBL: plugin not found: ' . join( ', ', @names ) . "\n"; ## no critic (RequireCheckedSyscall)
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#>>>
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exit 2;
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}
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return $loaded_module;
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}
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Readonly our $DEFAULT_TIMEOUT => 15;
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Readonly our $DEFAULT_RETRIES => 4;
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Readonly our $DEFAULT_WORKERS => 20;
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Readonly our $DEFAULT_QUERY_TIMEOUT => 15;
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# IMPORTANT: Nagios plugins could be executed using embedded perl in this case
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# the main routine would be executed as a subroutine and all the
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# declared subroutines would therefore be inner subroutines
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# This will cause all the global lexical variables not to stay shared
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# in the subroutines!
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#
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# All variables are therefore declared as package variables...
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#
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## no critic (ProhibitPackageVars)
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our ( @listed, @timeouts, $options, $plugin, $threshold, $timeouts_string, );
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##############################################################################
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# Usage : debug("some message string")
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# Purpose : write a message if the debugging option was specified
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# Returns : n/a
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# Arguments : message : message string
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# Throws : n/a
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# Comments : n/a
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# See also : n/a
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sub debug {
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# arguments
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my $message = shift;
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if ( !defined $message ) {
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$plugin->nagios_exit( $plugin_module->UNKNOWN,
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q{Internal error: not enough parameters for 'debug'} );
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}
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if ( $options && $options->debug() ) {
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## no critic (RequireCheckedSyscall)
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print "[DBG] $message\n";
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}
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return;
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}
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##############################################################################
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# Usage : verbose("some message string", $optional_verbosity_level);
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# Purpose : write a message if the verbosity level is high enough
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# Returns : n/a
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# Arguments : message : message string
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# level : options verbosity level
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# Throws : n/a
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# Comments : n/a
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# See also : n/a
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sub verbose {
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# arguments
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my $message = shift;
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my $level = shift;
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if ( !defined $message ) {
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$plugin->nagios_exit( $plugin_module->UNKNOWN,
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q{Internal error: not enough parameters for 'verbose'} );
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}
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if ( !defined $level ) {
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$level = 0;
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}
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if ( $level < $options->verbose ) {
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if ( !print $message ) {
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$plugin->nagios_exit( $plugin_module->UNKNOWN,
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'Error: cannot write to STDOUT' );
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}
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}
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return;
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}
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# the script is declared as a package so that it can be unit tested
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# but it should not be used as a module
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if ( !caller ) {
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run();
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}
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##############################################################################
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# Usage : my $res = init_dns_resolver( $retries )
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# Purpose : Initializes a new DNS resolver
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# Arguments : retries : number of retries
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# Returns : The newly created resolver
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# See also : Perl Net::DNS
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sub init_dns_resolver {
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my $retries = shift;
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my $res = Net::DNS::Resolver->new();
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if ( $res->can('force_v4') ) {
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$res->force_v4(1);
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}
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if ($retries) {
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$res->retry($retries);
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}
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return $res;
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}
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##############################################################################
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# Usage : mdns(\@addresses, $callback)
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# Purpose : Perform multiple DNS lookups in parallel
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# Returns : n/a
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# See also : Perl Net::DNS module mresolv in examples
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#
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# Resolves all IPs in C<@addresses> in parallel.
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# If answer is found C<$callback> is called with arguments as: $name, $host.
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#
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# Author: Elan Ruusamae <glen@delfi.ee>, (c) 1999-2010
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sub mdns {
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my ( $data, $callback ) = @_;
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# number of requests to have outstanding at any time
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my $workers = $options ? $options->workers() : 1;
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# timeout per query (seconds)
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my $timeout = $options ? $options->get('query-timeout') : $DEFAULT_TIMEOUT;
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my $res = init_dns_resolver( $options ? $options->retry() : 0 );
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my $sel = IO::Select->new();
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my $eof = 0;
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my @addrs = @{$data};
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my %addrs;
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while (1) {
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#----------------------------------------------------------------------
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# Read names until we've filled our quota of outstanding requests.
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#----------------------------------------------------------------------
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while ( !$eof && $sel->count() < $workers ) {
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my $name = shift @addrs;
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if ( !defined $name ) {
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debug('reading...EOF.');
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$eof = 1;
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last;
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}
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debug("reading...$name");
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my $sock = $res->bgsend($name);
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if ( !defined $sock ) {
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verbose 'DNS query error: ' . $res->errorstring;
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verbose "Skipping $name";
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}
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else {
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# we store in a hash the query we made, as parsing it back from
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# response gives different ip for ips with multiple hosts
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$addrs{$sock} = $name;
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$sel->add($sock);
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debug( "name = $name, outstanding = " . $sel->count() );
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}
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}
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#----------------------------------------------------------------------
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# Wait for any replies. Remove any replies from the outstanding pool.
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#----------------------------------------------------------------------
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my @ready;
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my $timed_out = 1;
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debug('waiting for replies');
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@ready = $sel->can_read($timeout);
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while (@ready) {
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$timed_out = 0;
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debug( 'replies received: ' . scalar @ready );
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foreach my $sock (@ready) {
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debug('handling a reply');
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my $addr = $addrs{$sock};
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delete $addrs{$sock};
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$sel->remove($sock);
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my $ans = $res->bgread($sock);
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debug Dumper $ans;
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my $host;
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if ($ans) {
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foreach my $rr ( $ans->answer ) {
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debug('Processing answer');
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## no critic(ProhibitDeepNests)
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if ( !( $rr->type eq 'A' ) ) {
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next;
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}
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$host = $rr->address;
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debug("host = $host");
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# take just the first answer
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last;
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}
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}
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else {
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debug( 'no answer: ' . $res->errorstring() );
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}
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if ( defined $host ) {
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debug("callback( $addr, $host )");
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}
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else {
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debug("callback( $addr, <undefined> )");
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}
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&{$callback}( $addr, $host );
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}
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@ready = $sel->can_read(0);
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}
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#----------------------------------------------------------------------
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# If we timed out waiting for replies, remove all entries from the
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# outstanding pool.
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#----------------------------------------------------------------------
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if ($timed_out) {
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debug('timeout: clearing the outstanding pool.');
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foreach my $sock ( $sel->handles() ) {
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my $addr = $addrs{$sock};
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delete $addrs{$sock};
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$sel->remove($sock);
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# callback for hosts that timed out
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&{$callback}( $addr, q{} );
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}
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}
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debug( 'outstanding = ' . $sel->count() . ", eof = $eof" );
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#----------------------------------------------------------------------
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# We're done if there are no outstanding queries and we've read EOF.
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#----------------------------------------------------------------------
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last if ( $sel->count() == 0 ) && $eof;
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}
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return;
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}
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##############################################################################
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# Usage : validate( $hostname );
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# Purpose : check if an IP address or host name is valid
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# Returns : the IP address corresponding to $hostname
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# Arguments : n/a
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# Throws : an UNKNOWN error if the argument is not valid
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# Comments : n/a
|
||
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# See also : n/a
|
||
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sub validate {
|
||
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my $hostname = shift;
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my $ip = $hostname;
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debug("validate($hostname, $ip)");
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if ( !is_ipv4($hostname) && !is_ipv6($hostname) ) {
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if ( is_hostname($hostname) ) {
|
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mdns(
|
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[$hostname],
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sub {
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|
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my ( $addr, $host ) = @_;
|
||
|
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$ip = $host;
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||
|
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}
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);
|
||
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|
||
|
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if ( !$ip ) {
|
||
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$plugin->nagios_exit( $plugin_module->UNKNOWN,
|
||
|
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'Cannot resolve ' . $hostname );
|
||
|
|
}
|
||
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|
||
|
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}
|
||
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|
||
|
|
if ( !$ip ) {
|
||
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$plugin->nagios_exit( $plugin_module->UNKNOWN,
|
||
|
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'Cannot resolve ' . $options->host );
|
||
|
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}
|
||
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|
||
|
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}
|
||
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|
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|
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return $ip;
|
||
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|
||
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}
|
||
|
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|
||
|
|
##############################################################################
|
||
|
|
# Usage : run();
|
||
|
|
# Purpose : main method
|
||
|
|
# Returns : n/a
|
||
|
|
# Arguments : n/a
|
||
|
|
# Throws : n/a
|
||
|
|
# Comments : n/a
|
||
|
|
# See also : n/a
|
||
|
|
sub run {
|
||
|
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|
||
|
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################################################################################
|
||
|
|
# Initialization
|
||
|
|
|
||
|
|
$plugin = $plugin_module->new( shortname => 'CHECK_RBL' );
|
||
|
|
|
||
|
|
my $time = time;
|
||
|
|
|
||
|
|
########################
|
||
|
|
# Command line arguments
|
||
|
|
|
||
|
|
$options = $plugin_getopt_module->new(
|
||
|
|
usage => 'Usage: %s [OPTIONS]',
|
||
|
|
version => $VERSION,
|
||
|
|
url => 'http://matteocorti.github.io/check_rbl/',
|
||
|
|
blurb => 'Check SMTP black- or white- listing status',
|
||
|
|
);
|
||
|
|
|
||
|
|
$options->arg(
|
||
|
|
spec => 'critical|c=i',
|
||
|
|
help => 'Number of blacklisting servers for a critical warning',
|
||
|
|
required => 0,
|
||
|
|
default => 1,
|
||
|
|
);
|
||
|
|
|
||
|
|
$options->arg(
|
||
|
|
spec => 'warning|w=i',
|
||
|
|
help => 'Number of blacklisting servers for a warning',
|
||
|
|
required => 0,
|
||
|
|
default => 1,
|
||
|
|
);
|
||
|
|
|
||
|
|
$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( $plugin_module->UNKNOWN,
|
||
|
|
'critical has to be greater or equal warning' );
|
||
|
|
}
|
||
|
|
|
||
|
|
my $ip = validate( $options->host );
|
||
|
|
|
||
|
|
my @servers = @{ $options->server };
|
||
|
|
|
||
|
|
verbose 'Using ' . $options->timeout . " as global script timeout\n";
|
||
|
|
alarm $options->timeout;
|
||
|
|
|
||
|
|
################
|
||
|
|
# Set the limits
|
||
|
|
|
||
|
|
# see https://nagios-plugins.org/doc/guidelines.html#THRESHOLDFORMAT
|
||
|
|
$threshold = $plugin_threshold_module->set_thresholds(
|
||
|
|
warning => $options->warning - 1,
|
||
|
|
critical => $options->critical - 1,
|
||
|
|
);
|
||
|
|
|
||
|
|
################################################################################
|
||
|
|
|
||
|
|
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 ) = @_;
|
||
|
|
|
||
|
|
if ( defined $host ) {
|
||
|
|
|
||
|
|
debug("callback( $addr, $host )");
|
||
|
|
|
||
|
|
}
|
||
|
|
else {
|
||
|
|
|
||
|
|
debug("callback( $addr, <undefined> )");
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
# 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;
|