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#!/usr/bin/perl # $Id: check_zone 1815 2020-10-14 21:55:18Z willem $ =head1 NAME check_zone - Check a DNS zone for errors =head1 SYNOPSIS C<check_zone> [ C<-r> ] I<domain> [ I<class> ] =head1 DESCRIPTION Checks a DNS zone for errors. Current checks are: =over 4 =item * Checks that all A records have corresponding PTR records. =item * Checks that hosts listed in NS, MX, and CNAME records have A records. =back =head1 OPTIONS =over 4 =item C<-r> Perform a recursive check on subdomains. =back =head1 AUTHOR Michael Fuhr <mike@fuhr.org> =head1 SEE ALSO L<perl(1)>, L<axfr>, L<check_soa>, L<mresolv>, L<mx>, L<perldig>, L<Net::DNS> =cut use strict; use warnings; use vars qw($opt_r); use Getopt::Std; use File::Basename; use IO::Socket; use Net::DNS; getopts("r"); die "Usage: ", basename($0), " [ -r ] domain [ class ]\n" unless (@ARGV >= 1) && (@ARGV <= 2); check_domain(@ARGV); exit; sub check_domain { my ($domain, $class) = @_; $class ||= "IN"; print "-" x 70, "\n"; print "$domain (class $class)\n"; print "\n"; my $res = Net::DNS::Resolver->new; $res->defnames(0); $res->retry(2); my $nspack = $res->query($domain, "NS", $class); unless (defined($nspack)) { warn "Couldn't find nameservers for $domain: ", $res->errorstring, "\n"; return; } print "nameservers (will request zone from first available):\n"; my $ns; foreach my $ns (grep { $_->type eq "NS" } $nspack->answer) { print "\t", $ns->nsdname, "\n"; } print "\n"; $res->nameservers(map { $_->nsdname } grep { $_->type eq "NS" } $nspack->answer); my @zone = $res->axfr($domain, $class); unless (@zone) { warn "Zone transfer failed: ", $res->errorstring, "\n"; return; } print "checking PTR records\n"; check_ptr($domain, $class, @zone); print "\n"; print "checking NS records\n"; check_ns($domain, $class, @zone); print "\n"; print "checking MX records\n"; check_mx($domain, $class, @zone); print "\n"; print "checking CNAME records\n"; check_cname($domain, $class, @zone); print "\n"; if ($opt_r) { print "checking subdomains\n\n"; my %subdomains; foreach (grep { $_->type eq "NS" and $_->name ne $domain } @zone) { $subdomains{$_->name} = 1; } foreach (sort keys %subdomains) { check_domain($_, $class); } } return; } sub check_ptr { my ($domain, $class, @zone) = @_; my $res = Net::DNS::Resolver->new; my $rr; foreach my $rr (grep { $_->type eq "A" } @zone) { my $host = $rr->name; my $addr = $rr->address; my $ans = $res->send($addr, "A", $class); print "\t$host ($addr) has no PTR record\n" if ($ans->header->ancount < 1); } return; } sub check_ns { my ($domain, $class, @zone) = @_; my $res = Net::DNS::Resolver->new; my $rr; foreach my $rr (grep { $_->type eq "NS" } @zone) { my $ans = $res->send($rr->nsdname, "A", $class); print "\t", $rr->nsdname, " has no A record\n" if ($ans->header->ancount < 1); } return; } sub check_mx { my ($domain, $class, @zone) = @_; my $res = Net::DNS::Resolver->new; my $rr; foreach my $rr (grep { $_->type eq "MX" } @zone) { my $ans = $res->send($rr->exchange, "A", $class); print "\t", $rr->exchange, " has no A record\n" if ($ans->header->ancount < 1); } return; } sub check_cname { my ($domain, $class, @zone) = @_; my $res = Net::DNS::Resolver->new; my $rr; foreach my $rr (grep { $_->type eq "CNAME" } @zone) { my $ans = $res->send($rr->cname, "A", $class); print "\t", $rr->cname, " has no A record\n" if ($ans->header->ancount < 1); } return; }