/usr/lib/nagios/plugins/check_zone_auth is in nagios-plugins-contrib 21.20170222.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
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# $Id: check_zone_auth,v 1.13 2010/07/23 15:54:08 wessels Exp $
#
# check_zone_auth
#
# nagios plugin to check that all authoritative nameservers for a zone
# have the same NS RRset and the same serial number.
#
# Can also check that the NS RRset is equal to specific nameservers
# passed on the command line.
# Copyright (c) 2008, The Measurement Factory, Inc. All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
#
# Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in the
# documentation and/or other materials provided with the distribution.
# Neither the name of The Measurement Factory nor the names of its
# contributors may be used to endorse or promote products derived
# from this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
# FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
# COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
# BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
# LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
# CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
# POSSIBILITY OF SUCH DAMAGE.
# USAGE
#
# define command {
# command_name check-zone-auth
# command_line /usr/local/libexec/nagios-local/check_zone_auth -Z $HOSTADDRESS$
# }
#
# define service {
# name dns-auth-service
# check_command check-zone-auth
# ...
# }
#
# define host {
# use dns-zone
# host_name zone.example.com
# alias ZONE example.com
# }
#
# define service {
# use dns-auth-service
# host_name zone.example.com
# }
# CONTRIBUTORS:
#
# Matt Christian
use warnings;
use strict;
use Getopt::Std;
use Net::DNS::Resolver;
use Net::DNS::Resolver::Recurse;
use Time::HiRes qw ( gettimeofday tv_interval);
use List::Util qw ( shuffle );
use vars qw( %opts @refs $zone $expected_ns_rrset $data $start $stop );
getopts('Z:N:d', \%opts);
usage() unless $opts{Z};
usage() if $opts{h};
$zone = $opts{Z};
$zone =~ s/^zone\.//;
$expected_ns_rrset = $opts{N} ? join(',', sort split(',', lc($opts{N}))) : undef;
@refs = qw (
a.root-servers.net
b.root-servers.net
c.root-servers.net
d.root-servers.net
e.root-servers.net
f.root-servers.net
g.root-servers.net
h.root-servers.net
i.root-servers.net
j.root-servers.net
k.root-servers.net
l.root-servers.net
m.root-servers.net
);
$start = [gettimeofday()];
do_recursion();
do_queries();
$stop = [gettimeofday()];
do_analyze();
sub do_recursion {
my $done = 0;
my $res = Net::DNS::Resolver->new;
do {
print STDERR "\nRECURSE\n" if $opts{d};
my $pkt;
foreach my $ns (shuffle @refs) {
print STDERR "sending query for $zone SOA to $ns\n" if $opts{d};
$res->nameserver($ns);
$res->udp_timeout(5);
$pkt = $res->send($zone, 'SOA');
last if $pkt;
}
critical("No response to seed query") unless $pkt;
critical($pkt->header->rcode . " from " . $pkt->answerfrom)
unless ($pkt->header->rcode eq 'NOERROR');
add_nslist_to_data($pkt);
@refs = ();
foreach my $rr ($pkt->authority) {
next unless ($rr->type eq 'NS');
print STDERR $rr->string, "\n" if $opts{d};
push (@refs, $rr->nsdname);
next unless names_equal($rr->name, $zone);
$done = 1;
}
} while (! $done);
}
sub do_queries {
#
# Net::DNS::Resolver::Recurse has some less-than-desirable
# properties. For one it seems to generate many more queries
# than necessary. Also it seems to have a tough time when
# IPv6 is involved. For now this is disabled in favor
# of a custom, simple recursor
#
# my $recres = Net::DNS::Resolver::Recurse->new;
# $recres->recursion_callback(sub {
# my $p = shift;
# #
# # This debugging below is commented out because it
# # generates a 'Variable "%opts" may be unavailable'
# # warning when ePN (embedded perl nagios) is in use.
# #
# #print STDERR $p->string if $opts{d};
# add_nslist_to_data($p);
# });
# my $seed = $recres->query_dorecursion($zone, 'SOA');
# critical("No response to seed query") unless $seed;
# $recres = undef;
#
# critical($seed->header->rcode . " from " . $seed->answerfrom)
# unless ($seed->header->rcode eq 'NOERROR');
# print STDERR $seed->string if $opts{d};
# add_nslist_to_data($seed);
my $n;
do {
$n = 0;
foreach my $ns (keys %$data) {
next if $data->{$ns}->{done};
print STDERR "\nQUERY $ns\n" if $opts{d};
my $pkt = send_query($zone, 'SOA', $ns);
add_nslist_to_data($pkt);
$data->{$ns}->{queries}->{SOA} = $pkt;
if ($pkt && $pkt->header->nscount == 0) {
my $ns_pkt = send_query($zone, 'NS', $ns);
add_nslist_to_data($ns_pkt);
$data->{$ns}->{queries}->{NS} = $ns_pkt;
}
print STDERR "done with $ns\n" if $opts{d};
$data->{$ns}->{done} = 1;
$n++;
}
} while ($n);
}
sub do_analyze {
my $maxserial = 0;
my $nscount = 0;
foreach my $ns (keys %$data) {
print STDERR "\nANALYZE $ns\n" if $opts{d};
my $soa_pkt = $data->{$ns}->{queries}->{SOA};
critical("No response from $ns") unless $soa_pkt;
print STDERR $soa_pkt->string if $opts{d};
critical($soa_pkt->header->rcode . " from $ns")
unless ($soa_pkt->header->rcode eq 'NOERROR');
critical("$ns is lame") unless $soa_pkt->header->ancount;
my $serial = soa_serial($soa_pkt);
$maxserial = $serial if ($serial > $maxserial);
$nscount++;
}
warning("No nameservers found. Is '$zone' a zone?") if ($nscount < 1);
warning("Only one auth NS") if ($nscount < 2);
if ($expected_ns_rrset) {
my $got_ns_rrset = join(',', sort keys %$data);
critical("Unexpected NS RRset: $got_ns_rrset")
unless $expected_ns_rrset eq $got_ns_rrset;
}
foreach my $ns (keys %$data) {
my $soa_pkt = $data->{$ns}->{queries}->{SOA};
my $ns_pkt = $data->{$ns}->{queries}->{NS};
# see if this nameserver lists all nameservers
#
my %all_ns;
foreach my $data_ns (keys %$data) { $all_ns{$data_ns} = 1; }
foreach my $soa_ns (get_nslist($soa_pkt)) { delete $all_ns{$soa_ns}; }
foreach my $ns_ns (get_nslist($ns_pkt)) { delete $all_ns{$ns_ns}; }
if (keys %all_ns) {
warning("$ns does not include " .
join(',', keys %all_ns) .
" in NS RRset");
}
warning("$ns claims is it not authoritative") unless $soa_pkt->header->aa;
my $serial = soa_serial($soa_pkt);
warning("$ns serial ($serial) is less than the maximum ($maxserial)") if ($serial < $maxserial);
}
success("$nscount nameservers, serial $maxserial");
}
sub add_nslist_to_data {
my $pkt = shift;
foreach my $ns (get_nslist($pkt)) {
print STDERR "adding NS $ns\n" if $opts{d};
$data->{$ns}->{done} |= 0;
}
}
sub soa_serial {
my $pkt = shift;
foreach my $rr ($pkt->answer) {
next unless ($rr->type eq 'SOA');
next unless ($rr->name eq $zone);
return $rr->serial;
}
return 0;
}
sub success {
output('OK', shift);
exit(0);
}
sub warning {
output('WARNING', shift);
exit(1);
}
sub critical {
output('CRITICAL', shift);
exit(2);
}
sub output {
my $state = shift;
my $msg = shift;
$stop = [gettimeofday()] unless $stop;
my $latency = tv_interval($start, $stop);
printf "ZONE %s: %s; (%.2fs) |time=%.6fs;;;0.000000\n",
$state,
$msg,
$latency,
$latency;
}
sub usage {
print STDERR "usage: $0 -Z zone [-N ns1,ns2,ns3]\n";
print STDERR "\t-Z specifies the zone to test\n";
print STDERR "\t-N optionally specifies the expected NS RRset\n";
exit 3;
}
sub send_query {
my $qname = shift;
my $qtype = shift;
my $server = shift;
my $res = Net::DNS::Resolver->new;
$res->nameserver($server) if $server;
return $res->send($qname, $qtype);
}
sub get_nslist {
my $pkt = shift;
return () unless $pkt;
my @nslist = ();
foreach my $rr ($pkt->authority) {
next unless ($rr->type eq 'NS');
next unless names_equal($rr->name, $zone);
push(@nslist, lc($rr->nsdname));
}
return @nslist if @nslist;
#
# look for NS records in answer section too
#
foreach my $rr ($pkt->answer) {
next unless ($rr->type eq 'NS');
next unless names_equal($rr->name, $zone);
push(@nslist, lc($rr->nsdname));
}
return @nslist;
}
sub names_equal {
my $a = shift;
my $b = shift;
$a =~ s/\.$//;
$b =~ s/\.$//;
lc($a) eq lc($b);
}
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