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package Net::DNS::RR::APL; use strict; use warnings; our $VERSION = (qw$Id: APL.pm 1857 2021-12-07 13:38:02Z willem $)[2]; use base qw(Net::DNS::RR); =head1 NAME Net::DNS::RR::APL - DNS APL resource record =cut use integer; use Carp; sub _decode_rdata { ## decode rdata from wire-format octet string my $self = shift; my ( $data, $offset ) = @_; my $limit = $offset + $self->{rdlength}; my $aplist = $self->{aplist} = []; while ( $offset < $limit ) { my $xlen = unpack "\@$offset x3 C", $$data; my $size = ( $xlen & 0x7F ); my $item = bless {}, 'Net::DNS::RR::APL::Item'; $item->{negate} = $xlen - $size; @{$item}{qw(family prefix address)} = unpack "\@$offset n C x a$size", $$data; $offset += $size + 4; push @$aplist, $item; } croak('corrupt APL data') unless $offset == $limit; # more or less FUBAR return; } sub _encode_rdata { ## encode rdata as wire-format octet string my $self = shift; my @rdata; my $aplist = $self->{aplist}; foreach (@$aplist) { my $address = $_->{address}; $address =~ s/[\000]+$//; # strip trailing null octets my $xlength = ( $_->{negate} ? 0x80 : 0 ) | length($address); push @rdata, pack 'n C2 a*', @{$_}{qw(family prefix)}, $xlength, $address; } return join '', @rdata; } sub _format_rdata { ## format rdata portion of RR string. my $self = shift; my $aplist = $self->{aplist}; my @rdata = map { $_->string } @$aplist; return @rdata; } sub _parse_rdata { ## populate RR from rdata in argument list my $self = shift; $self->aplist(@_); return; } sub aplist { my $self = shift; while ( scalar @_ ) { # parse apitem strings last unless $_[0] =~ m#[!:./]#; shift =~ m#^(!?)(\d+):(.+)/(\d+)$#; my $n = $1 ? 1 : 0; my $f = $2 || 0; my $a = $3; my $p = $4 || 0; $self->aplist( negate => $n, family => $f, address => $a, prefix => $p ); } my $aplist = $self->{aplist} ||= []; if ( my %argval = @_ ) { # parse attribute=value list my $item = bless {}, 'Net::DNS::RR::APL::Item'; while ( my ( $attribute, $value ) = each %argval ) { $item->$attribute($value) unless $attribute eq 'address'; } $item->address( $argval{address} ); # address must be last push @$aplist, $item; } my @ap = @$aplist; return unless defined wantarray; return wantarray ? @ap : join ' ', map { $_->string } @ap; } ######################################## package Net::DNS::RR::APL::Item; ## no critic ProhibitMultiplePackages use Net::DNS::RR::A; use Net::DNS::RR::AAAA; my %family = qw(1 Net::DNS::RR::A 2 Net::DNS::RR::AAAA); sub negate { my $self = shift; return $self->{negate} = shift if scalar @_; return $self->{negate}; } sub family { my $self = shift; $self->{family} = 0 + shift if scalar @_; return $self->{family} || 0; } sub prefix { my $self = shift; $self->{prefix} = 0 + shift if scalar @_; return $self->{prefix} || 0; } sub address { my $self = shift; my $family = $family{$self->family} || die 'unknown address family'; return bless( {%$self}, $family )->address unless scalar @_; my $bitmask = $self->prefix; my $address = bless( {}, $family )->address(shift); return $self->{address} = pack "B$bitmask", unpack 'B*', $address; } sub string { my $self = shift; my $not = $self->{negate} ? '!' : ''; my ( $family, $address, $prefix ) = ( $self->family, $self->address, $self->prefix ); return "$not$family:$address/$prefix"; } 1; __END__ =head1 SYNOPSIS use Net::DNS; $rr = Net::DNS::RR->new('name IN APL aplist'); =head1 DESCRIPTION DNS Address Prefix List (APL) record =head1 METHODS The available methods are those inherited from the base class augmented by the type-specific methods defined in this package. Use of undocumented package features or direct access to internal data structures is discouraged and could result in program termination or other unpredictable behaviour. =head2 aplist @aplist = $rr->aplist; @aplist = $rr->aplist( '1:192.168.32.0/21', '!1:192.168.38.0/28' ); @aplist = $rr->aplist( '1:224.0.0.0/4', '2:FF00:0:0:0:0:0:0:0/8' ); @aplist = $rr->aplist( negate => 1, family => 1, address => '192.168.38.0', prefix => 28, ); Ordered, possibly empty, list of address prefix items. Additional items, if present, are appended to the existing list with neither prefix aggregation nor reordering. =head2 Net::DNS::RR::APL::Item Each element of the prefix list is a Net::DNS::RR::APL::Item object which is inextricably bound to the APL record which created it. =head2 negate $rr->negate(1); if ( $rr->negate ) { ... } Boolean attribute indicating the prefix to be an address range exclusion. =head2 family $family = $rr->family; $rr->family( $family ); Address family discriminant. =head2 prefix $prefix = $rr->prefix; $rr->prefix( $prefix ); Number of bits comprising the address prefix. =head2 address $address = $object->address; Address portion of the prefix list item. =head2 string $string = $object->string; Returns the prefix list item in the form required in zone files. =head1 COPYRIGHT Copyright (c)2008 Olaf Kolkman, NLnet Labs. Portions Copyright (c)2011,2017 Dick Franks. All rights reserved. Package template (c)2009,2012 O.M.Kolkman and R.W.Franks. =head1 LICENSE Permission to use, copy, modify, and distribute this software and its documentation for any purpose and without fee is hereby granted, provided that the original copyright notices appear in all copies and that both copyright notice and this permission notice appear in supporting documentation, and that the name of the author not be used in advertising or publicity pertaining to distribution of the software without specific prior written permission. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. =head1 SEE ALSO L<perl>, L<Net::DNS>, L<Net::DNS::RR>, RFC3123 =cut