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#!/usr/bin/env perl
HideShow 60 lines of Pod
=head1 NAME
B<zonewalk> - recursive DNS zone walk
=head1 SYNOPSIS
B<zonewalk> [-d] [-4] [-6] [-l] [-s server] B<zone> 
=head1 DESCRIPTION
This script walks the given zone recursively and prints all the DWIM resource records.
As a convenience, if you specify an ip address as startzone the reverse zone is fetched, e.g.
  134.60         does the zonewalk for 60.134.in-addr.arpa
  2001:07c0:0900 does the zonewalk for 0.0.9.0.0.c.7.0.1.0.0.2.ip6.arpa
The server option is optional. If you don't specify the server, default servers are used, as defined by the resolver config file.
Keep in mind that the server must be authoritative for the zones and the client must be allowed to fetch the zones from the authoritative server via AXFR.
=head1 OPTIONS
=over 4
=item B<-d>
  Enable debug messages
=item B<-4>
  Print A records, no AAAA records
=item B<-6>
  Print AAAA records, no A records
=item B<-l>
  Long zone listing, print all resource records instead of DWIM
=item B<-s server>
  DNS server for zone transfers, must be authoritative or authorized
=back
=head1 ARGUMENTS
Define the DNS start zone.
=head1 LIMITATIONS
If IPv6 addresses are given, abbreviated forms are not allowed, .e.g.
  2001:07c0:0900     allowed
  2001:7c0:900   not allowed
=cut
use strict;
use warnings;
use feature qw(switch);
use App::DNS::Zonewalk qw();
use Getopt::Long qw(GetOptions);
use Pod::Usage qw(pod2usage);
our $VERSION = '0.05';
our $debug;
our $v4;
our $v6;
our $long_listing;
our $server;
our $start_zone;
handle_options();
my $rec_zone_listing = run_raxfr($start_zone);
print_rec_zone($rec_zone_listing);
exit;
###############################################################
#                         end of main
###############################################################
#
# check cmdline flags and args
#
sub handle_options {
    GetOptions(
        'debug|d'    => \$debug,
        '4'          => \$v4,
        '6'          => \$v6,
        'long|l'     => \$long_listing,
        'server|s=s' => \$server,
      )
      or pod2usage(
        -exitval => 2,
        -verbose => 1,
      );
    # get the start zone from cmdline
    $start_zone = lc shift @ARGV
      or pod2usage(
        -exitval => 2,
        -verbose => 1,
        -message => 'missing zone',
      );
    # #####################
    # convenience function
    # #####################
    #
    # check for IPv4 address as start zone, build reverse zone
    if ( Net::DNS::Resolver::Base::_ip_is_ipv4($start_zone) ) {
        my @octets = split( /\./, $start_zone );
        $start_zone = join( '.', reverse @octets );
        $start_zone .= '.in-addr.arpa';
    }
    # check for IPv6 address as start zone, build reverse zone
    elsif ( Net::DNS::Resolver::Base::_ip_is_ipv6($start_zone) ) {
        # this simple algo works only for fully expanded IPv6 addresses
        $start_zone =~ s/://g;
        my @octets = split( //, $start_zone );
        $start_zone = join( '.', reverse @octets );
        $start_zone .= '.ip6.arpa';
    }
    return 1;
}
#
# create a Net::DNS::Resolver object and do a raxfr() fro start zone
# return an array-ref of Net::DNS::RR objects from zone walk
#
sub run_raxfr {
    my $zone = shift;
    my $resolver = App::DNS::Zonewalk->new(
        retrans     => 1,
        retry       => 1,
        tcp_timeout => 3,
        debug       => $debug,
        $server ? ( nameservers => [$server] ) : (),
    );
    my $rec_zone_listing = $resolver->raxfr($zone);
    unless (@$rec_zone_listing) {
        warn "Cannot fetch '$zone': ", $resolver->errorstring, "\n";
        exit 1;
    }
    return $rec_zone_listing;
}
#
# print A, AAAA or PTR records as default
# only when requested (-l) do a full RR listing
#
sub print_rec_zone {
    my ($zone) = @_;
    foreach my $rr (@$zone) {
        if ($long_listing) {
            $rr->print;
            next;
        }
        # was this a reverse_zone walk, just print the PTR records
        if ( $start_zone =~ m/ .* \.in-addr\.arpa $ | .* \.ip6\.arpa $/ix )
        {
            printf "%-30s %s\n", $rr->name, $rr->ptrdname
              if $rr->type eq 'PTR';
            next;
        }
        given ( $rr->type ) {
            when ('A') {
                printf "%-15s %s\n", $rr->address, $rr->name unless $v6;
            }
            when ('AAAA') {
                printf "%-40s %s\n", $rr->address, $rr->name unless $v4;
            }
        }
    }
}
HideShow 46 lines of Pod
=head1 AUTHOR
Karl Gaissmaier, C<< <gaissmai(at)cpan.org> >>
=head1 BUGS
Please report any bugs or feature requests to C<bug-app-dns-zonewalk at rt.cpan.org>, or through
the web interface at L<http://rt.cpan.org/NoAuth/ReportBug.html?Queue=App-DNS-Zonewalk>.  I will be notified, and then you'll
automatically be notified of progress on your bug as I make changes.
=head1 SUPPORT
You can look for information at:
=over 4
=item * RT: CPAN's request tracker (report bugs here)
L<http://rt.cpan.org/NoAuth/Bugs.html?Dist=App-DNS-Zonewalk>
=item * AnnoCPAN: Annotated CPAN documentation
L<http://annocpan.org/dist/App-DNS-Zonewalk>
=item * CPAN Ratings
L<http://cpanratings.perl.org/d/App-DNS-Zonewalk>
=item * Search CPAN
L<http://search.cpan.org/dist/App-DNS-Zonewalk/>
=back
=head1 LICENSE AND COPYRIGHT
Copyright 2012 Karl Gaissmaier.
This program is free software; you can redistribute it and/or modify it
under the terms of either: the GNU General Public License as published
by the Free Software Foundation; or the Artistic License.
See http://dev.perl.org/licenses/ for more information.
=cut
# vim: sw=2 ft=perl