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package Net::DNS::RR::NSEC; use strict; use warnings; our $VERSION = (qw$Id: NSEC.pm 1857 2021-12-07 13:38:02Z willem $)[2]; 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 qw(:type); sub _decode_rdata { ## decode rdata from wire-format octet string my $self = shift; my ( $data, $offset ) = @_; my $limit = $offset + $self->{rdlength}; ( $self->{nxtdname}, $offset ) = Net::DNS::DomainName->decode(@_); $self->{typebm} = substr $$data, $offset, $limit - $offset; return; } 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 ( $nxtdname->string(), $self->typelist ); } sub _parse_rdata { ## populate RR from rdata in argument list my $self = shift; $self->nxtdname(shift); $self->typelist(@_); return; } sub _defaults { ## specify RR attribute default values my $self = shift; $self->_parse_rdata('.'); return; } sub nxtdname { my $self = shift; $self->{nxtdname} = Net::DNS::DomainName->new(shift) if scalar @_; return $self->{nxtdname} ? $self->{nxtdname}->name : undef; } sub typelist { my $self = shift; if ( scalar(@_) || !defined(wantarray) ) { $self->{typebm} = &_type2bm; return; } my @type = &_bm2type( $self->{typebm} ); return wantarray ? (@type) : "@type"; } sub typemap { my $self = shift; my $number = typebyname(shift); my $window = $number >> 8; my $bitnum = $number & 255; my $typebm = $self->{typebm} || return; my @bitmap; my $index = 0; while ( $index < length $typebm ) { my ( $block, $size ) = unpack "\@$index C2", $typebm; $bitmap[$block] = unpack "\@$index xxa$size", $typebm; $index += $size + 2; } my @bit = split //, unpack 'B*', ( $bitmap[$window] || return ); return $bit[$bitnum]; } sub match { my $self = shift; my $name = Net::DNS::DomainName->new(shift)->canonical; return $name eq $self->{owner}->canonical; } sub covers { my $self = shift; my $name = join chr(0), reverse Net::DNS::DomainName->new(shift)->_wire; my $this = join chr(0), reverse $self->{owner}->_wire; my $next = join chr(0), reverse $self->{nxtdname}->_wire; foreach ( $name, $this, $next ) {tr /\101-\132/\141-\172/} return ( $name cmp $this ) + ( "$next\001" cmp $name ) == 2 unless $next gt $this; return ( $name cmp $this ) + ( $next cmp $name ) == 2; } sub encloser { my $self = shift; my @qname = Net::DNS::Domain->new(shift)->label; my @owner = $self->{owner}->label; my $depth = scalar(@owner); my $next; while ( scalar(@qname) > $depth ) { $next = shift @qname; } return unless defined $next; my $nextcloser = join( '.', $next, @qname ); return if lc($nextcloser) ne lc( join '.', $next, @owner ); $self->{nextcloser} = $nextcloser; $self->{wildcard} = join( '.', '*', @qname ); return $self->owner; } sub nextcloser { return shift->{nextcloser}; } sub wildcard { return shift->{wildcard}; } ######################################## 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 @_; $self->_deprecate('prefer $rr->typelist() or $rr->typemap()'); return $self->{typebm}; } sub covered { ## historical my $self = shift; # uncoverable pod return $self->covers(@_); } ######################################## 1; __END__ =head1 SYNOPSIS use Net::DNS; $rr = Net::DNS::RR->new( '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; typelist() identifies the RRset types that exist at the NSEC RR owner name. When called in scalar context, the list is interpolated into a string. =head2 typemap $exists = $rr->typemap($rrtype); typemap() returns a Boolean true value if the specified RRtype occurs in the type bitmap of the NSEC record. =head2 match $matched = $rr->match( 'example.foo' ); match() returns a Boolean true value if the canonical form of the name argument matches the canonical owner name of the NSEC RR. =head2 covers $covered = $rr->covers( 'example.foo' ); covers() returns a Boolean true value if the canonical form of the name, or one of its ancestors, falls between the owner name and the nxtdname field of the NSEC record. =head2 encloser, nextcloser, wildcard $encloser = $rr->encloser( 'example.foo' ); print "encloser: $encloser\n" if $encloser; encloser() returns the name of a provable encloser of the query name argument obtained from the NSEC RR. nextcloser() returns the next closer name, which is one label longer than the closest encloser. This is only valid after encloser() has returned a valid domain name. wildcard() returns the unexpanded wildcard name from which the next closer name was possibly synthesised. This is only valid after encloser() has returned a valid domain name. =head1 COPYRIGHT Copyright (c)2001-2005 RIPE NCC. Author Olaf M. Kolkman Portions Copyright (c)2018-2019 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>, RFC4034, RFC9077 =cut