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package Net::DNS::RR::NSEC; # # $Id: NSEC.pm 1406 2015-10-05 08:25:49Z willem $ # use vars qw($VERSION); $VERSION = (qw$LastChangedRevision: 1406 $)[1]; use strict; use base qw(Net::DNS::RR); =head1 NAME Net::DNS::RR::NSEC - DNS NSEC resource record =cut use integer; use Net::DNS::DomainName; use Net::DNS::Parameters; sub _decode_rdata { ## decode rdata from wire-format octet string my $self = shift; my ( $data, $offset ) = @_; my $limit = $offset + $self->{rdlength}; ( $self->{nxtdname}, $offset ) = decode Net::DNS::DomainName(@_); $self->{typebm} = substr $$data, $offset, $limit - $offset; } sub _encode_rdata { ## encode rdata as wire-format octet string my $self = shift; my $nxtdname = $self->{nxtdname} || return ''; join '', $nxtdname->encode(), $self->{typebm}; } sub _format_rdata { ## format rdata portion of RR string. my $self = shift; my $nxtdname = $self->{nxtdname} || return ''; my @rdata = ( $nxtdname->string(), $self->typelist ); } sub _parse_rdata { ## populate RR from rdata in argument list my $self = shift; $self->nxtdname(shift); $self->typelist(@_); } sub nxtdname { my $self = shift; $self->{nxtdname} = new Net::DNS::DomainName(shift) if scalar @_; $self->{nxtdname}->name if $self->{nxtdname}; } sub typelist { my $self = shift; $self->{typebm} = &_type2bm if scalar @_; my @type = defined wantarray ? &_bm2type( $self->{typebm} ) : (); return wantarray ? (@type) : "@type"; } ######################################## sub _type2bm { my @typearray; foreach my $typename ( map split(), @_ ) { my $number = typebyname($typename); my $window = $number >> 8; my $bitnum = $number & 255; my $octet = $bitnum >> 3; my $bit = $bitnum & 7; $typearray[$window][$octet] |= 0x80 >> $bit; } my $bitmap = ''; my $window = 0; foreach (@typearray) { if ( my $pane = $typearray[$window] ) { my @content = map $_ || 0, @$pane; $bitmap .= pack 'CC C*', $window, scalar(@content), @content; } $window++; } return $bitmap; } sub _bm2type { my @typelist; my $bitmap = shift || return @typelist; my $index = 0; my $limit = length $bitmap; while ( $index < $limit ) { my ( $block, $size ) = unpack "\@$index C2", $bitmap; my $typenum = $block << 8; foreach my $octet ( unpack "\@$index xxC$size", $bitmap ) { my $i = $typenum += 8; my @name; while ($octet) { --$i; unshift @name, typebyval($i) if $octet & 1; $octet = $octet >> 1; } push @typelist, @name; } $index += $size + 2; } return @typelist; } sub typebm { ## historical my $self = shift; # uncoverable pod $self->{typebm} = shift if scalar @_; return $self->{typebm}; } 1; __END__ =head1 SYNOPSIS use Net::DNS; $rr = new Net::DNS::RR('name NSEC nxtdname typelist'); =head1 DESCRIPTION Class for DNSSEC NSEC resource records. =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 nxtdname $nxtdname = $rr->nxtdname; $rr->nxtdname( $nxtdname ); The Next Domain field contains the next owner name (in the canonical ordering of the zone) that has authoritative data or contains a delegation point NS RRset. =head2 typelist @typelist = $rr->typelist; $typelist = $rr->typelist; The Type List identifies the RRset types that exist at the NSEC RR owner name. When called in scalar context, the list is interpolated into a string. =head1 COPYRIGHT Copyright (c)2001-2005 RIPE NCC. Author Olaf M. Kolkman 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 above copyright notice appear in all copies and that both that 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>, RFC4034, RFC3755 =cut