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RR
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package Net::DNS::RR::SVCB; use strict; use warnings; our $VERSION = (qw$Id: SVCB.pm 1838 2021-05-02 12:35:14Z willem $)[2]; use base qw(Net::DNS::RR); =head1 NAME Net::DNS::RR::SVCB - DNS SVCB resource record =cut use integer; use Carp; use MIME::Base64; use Net::DNS::DomainName; use Net::DNS::RR::A; use Net::DNS::RR::AAAA; use Net::DNS::Text; sub _decode_rdata { ## decode rdata from wire-format octet string my $self = shift; my ( $data, $offset ) = @_; my $rdata = substr $$data, $offset, $self->{rdlength}; $self->{SvcPriority} = unpack( 'n', $rdata ); my $index; ( $self->{TargetName}, $index ) = Net::DNS::DomainName->decode( \$rdata, 2 ); my $params = $self->{SvcParams} = []; my $limit = length($rdata) - 3; while ( $index < $limit ) { my ( $key, $size ) = unpack( "\@$index n2", $rdata ); push @$params, ( $key, substr $rdata, $index + 4, $size ); $index += ( $size + 4 ); } die 'corrupt RDATA in ' . $self->type unless $index == length($rdata); return; } sub _encode_rdata { ## encode rdata as wire-format octet string my $self = shift; my @packed = pack 'n a*', $self->{SvcPriority}, $self->{TargetName}->encode; my $params = $self->{SvcParams} || []; my @params = @$params; while (@params) { my $key = shift @params; my $val = shift @params; push @packed, pack( 'n2a*', $key, length($val), $val ); } return join '', @packed; } sub _format_rdata { ## format rdata portion of RR string. my $self = shift; my $priority = $self->{SvcPriority}; my $params = $self->{SvcParams} || []; return ( $priority, $self->{TargetName}->string ) unless scalar @$params; my @rdata = unpack 'H4', pack 'n', $priority; my $target = $self->{TargetName}->encode(); my $length = 2 + length $target; my @target = split /(\S{32})/, unpack 'H*', $target; push @rdata, $length > 18 ? "\t; $priority\n" : (), @target; push @rdata, join '', "\t; ", $self->{TargetName}->string, "\n" if $length > 3; my @params = @$params; while (@params) { my $key = shift @params; my $val = shift @params; push @rdata, "\n"; push @rdata, "; key$key=...\n" if $key > 15; push @rdata, unpack 'H4H4', pack( 'n2', $key, length $val ); push @rdata, split /(\S{32})/, unpack 'H*', $val; $length += 4 + length $val; } return ( "\\# $length", @rdata ); } sub _parse_rdata { ## populate RR from rdata in argument list my $self = shift; $self->svcpriority(shift); $self->targetname(shift); while ( my $svcparam = shift ) { for ($svcparam) { my @value = ''; if (/=(.*)$/) { local $_ = length($1) ? $1 : shift; s/^(["'])(.*)\1$/$2/; # strip paired quotes s/\\,/\\044/g; # disguise escaped comma @value = ( $svcparam =~ /^key/i ) ? $_ : split /,/; } s/[-]/_/g; # extract identifier m/^([^=]+)/; $self->$1(@value); } } return; } sub _post_parse { ## parser post processing my $self = shift; my $params = $self->{SvcParams} || return; my %params = @$params; $self->key0(undef); # ruse to force sorting of SvcParams if ( defined $params{0} ) { my %unique; foreach ( grep { !$unique{$_}++ } unpack 'n*', $params{0} ) { croak( $self->type . qq[: unexpected "key0" in mandatory list] ) if $unique{0}; croak( $self->type . qq[: duplicate "key$_" in mandatory list] ) if --$unique{$_}; croak( $self->type . qq[: mandatory "key$_" not defined] ) unless defined $params{$_}; } $self->mandatory( keys %unique ); # sort mandatory key list } return; } sub _defaults { ## specify RR attribute default values my $self = shift; $self->_parse_rdata(qw(0 .)); return; } sub svcpriority { my $self = shift; # uncoverable pod $self->{SvcPriority} = 0 + shift if scalar @_; return $self->{SvcPriority} || 0; } sub targetname { my $self = shift; # uncoverable pod $self->{TargetName} = Net::DNS::DomainName->new(shift) if scalar @_; my $target = $self->{TargetName} ? $self->{TargetName}->name : return; return $target unless $self->{SvcPriority}; return ( $target eq '.' ) ? $self->owner : $target; } ######################################## use constant ASCII => chr(65) eq 'A'; my %escape = do { ## precalculated ASCII escape table my %table = map { ( chr($_) => chr($_) ) } ( 0 .. 255 ); foreach my $codepoint ( 0 .. 32, 92, 127 .. 255 ) { # numerical escape my $ddd = sprintf( '%03u', $codepoint ); $ddd =~ tr [0-9] [\060-\071]; # transliterate non-ASCII $table{pack( 'C', $codepoint )} = pack 'C a3', 92, $ddd; } foreach my $codepoint ( 34, 44 ) { # character escape $table{pack( 'C', $codepoint )} = pack 'C2', 92, $codepoint; } %table; }; sub _presentation { ## render octet string(s) in presentation format return () unless scalar @_; local $_ = join '', map { $escape{$_} } split( //, join '', @_ ); # partial transliteration for non-ASCII character encodings tr [\040-\176\000-\377] [ !"#$%&'()*+,\-./0-9:;<=>?@A-Z\[\\\]^_`a-z{|}~?] unless ASCII; return $_; } sub _base64 { return map { _presentation( MIME::Base64::decode($_) ) } @_; } sub _integer16 { return _presentation( map { pack( 'n', $_ ) } @_ ); } sub _ipv4 { return _presentation( map { bless( {}, 'Net::DNS::RR::A' )->address($_) } @_ ); } sub _ipv6 { return _presentation( map { bless( {}, 'Net::DNS::RR::AAAA' )->address($_) } @_ ); } sub _string { return _presentation( map { Net::DNS::Text->new($_)->encode() } @_ ); } my %keybyname = ( mandatory => 0, alpn => 1, 'no-default-alpn' => 2, port => 3, ipv4hint => 4, ech => 5, echconfig => 5, # draft-ietf-dnsop-svcb-https compatible ipv6hint => 6, ); sub mandatory { ## mandatory=key1,port,... my ( $self, @arg ) = grep {defined} @_; my @keys = map { $keybyname{lc $_} || ( /(\d+)$/ ? $1 : croak qq["$_" unknown] ) } @arg; return $self->key0( _integer16( sort { $a <=> $b } @keys ) ); } sub alpn { ## alpn=h3,h2,... my $self = shift; return $self->key1( _string(@_) ); } sub no_default_alpn { ## no-default-alpn return shift->key2( map {''} @_ ); # uncoverable pod } sub port { ## port=1234 my $self = shift; return $self->key3( _integer16(@_) ); } sub ipv4hint { ## ipv4hint=192.0.2.1,... my $self = shift; return $self->key4( _ipv4(@_) ); } sub ech { ## ech=base64string my $self = shift; return $self->key5( _base64(@_) ); } sub echconfig { ## echconfig=base64string $_[0]->_deprecate(qq[please use "ech"]); # uncoverable pod return &ech; } sub ipv6hint { ## ipv6hint=2001:DB8::1,... my $self = shift; return $self->key6( _ipv6(@_) ); } our $AUTOLOAD; sub AUTOLOAD { ## Dynamic constructor/accessor methods my $self = shift; my ($method) = reverse split /::/, $AUTOLOAD; my $default = join '::', 'SUPER', $method; return $self->$default(@_) unless $method =~ /^key[0]*(\d+)$/i; my $key = $1; my $params = $self->{SvcParams} || []; my %params = @$params; if ( scalar @_ ) { my $arg = shift; # keyNN($value); croak 'unexpected number of arguments' if scalar @_; delete $params{$key}; $params{$key} = Net::DNS::Text->new("$arg")->raw if defined $arg; $self->{SvcParams} = [map { ( $_, $params{$_} ) } sort { $a <=> $b } keys %params]; } my $value = $params{$key}; return defined($value) ? _presentation($value) : $value; } 1; __END__ =head1 SYNOPSIS use Net::DNS; $rr = Net::DNS::RR->new('name HTTPS SvcPriority TargetName alpn=h3,...'); =head1 DESCRIPTION DNS Service Binding (SVCB) resource record Service binding and parameter specification via the DNS (SVCB and HTTPS RRs) =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 SvcPriority $svcpriority = $rr->svcpriority; $rr->svcpriority( $svcpriority ); The priority of this record (relative to others, with lower values preferred). A value of 0 indicates AliasMode. =head2 TargetName $rr->targetname( $targetname ); $effecivetarget = $rr->targetname; The domain name of either the alias target (for AliasMode) or the alternative endpoint (for ServiceMode). For AliasMode SVCB RRs, a TargetName of "." indicates that the service is not available or does not exist. For ServiceMode SVCB RRs, a TargetName of "." indicates that the owner name of this record must be used as the effective TargetName. =head2 mandatory, alpn, no-default-alpn, port, ipv4hint, ech, ipv6hint $rr = Net::DNS::RR->new( 'svc.example. SVCB 1 svc.example. port=1234' ); $rr->port(1234); $string = $rr->port(); # \004\210 $rr->key3($string); Constructor methods for mnemonic SvcParams defined in draft-ietf-dnsop-svcb-https-02. When invoked without arguments, the methods return the presentation format value for the underlying key. The behaviour with undefined arguments is not specified. =head2 keyNN $keynn = $rr->keyNN; $rr->keyNN( $keynn ); $rr->keyNN( undef ); Generic constructor and accessor methods for SvcParams. The key index NN is a decimal integer in the range 0 .. 65534. The method argument and returned value are both presentation format strings. The method returns the undefined value if the key is not present. The specified key will be deleted if the value is undefined. =head1 COPYRIGHT Copyright (c)2020-2021 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 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>, draft-ietf-dnsop-svcb-https-02 =cut
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