163 lines
3.8 KiB
Perl
163 lines
3.8 KiB
Perl
package Net::DNS::RR::MX;
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use strict;
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use warnings;
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our $VERSION = (qw$Id: MX.pm 1945 2023-11-22 08:02:31Z willem $)[2];
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use base qw(Net::DNS::RR);
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=head1 NAME
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Net::DNS::RR::MX - DNS MX resource record
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=cut
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use integer;
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use Net::DNS::DomainName;
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sub _decode_rdata { ## decode rdata from wire-format octet string
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my ( $self, $data, $offset, @opaque ) = @_;
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$self->{preference} = unpack( "\@$offset n", $$data );
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$self->{exchange} = Net::DNS::DomainName1035->decode( $data, $offset + 2, @opaque );
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return;
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}
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sub _encode_rdata { ## encode rdata as wire-format octet string
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my ( $self, @argument ) = @_;
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my ( $offset, @opaque ) = @argument;
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my $exchange = $self->{exchange};
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return pack 'n a*', $self->preference, $exchange->encode( $offset + 2, @opaque );
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}
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sub _format_rdata { ## format rdata portion of RR string.
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my $self = shift;
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my $exchange = $self->{exchange};
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return join ' ', $self->preference, $exchange->string;
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}
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sub _parse_rdata { ## populate RR from rdata in argument list
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my ( $self, @argument ) = @_;
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for (qw(preference exchange)) { $self->$_( shift @argument ) }
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return;
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}
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sub _defaults { ## specify RR attribute default values
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my $self = shift;
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$self->preference(10);
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return;
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}
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sub preference {
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my ( $self, @value ) = @_;
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for (@value) { $self->{preference} = 0 + $_ }
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return $self->{preference} || 0;
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}
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sub exchange {
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my ( $self, @value ) = @_;
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for (@value) { $self->{exchange} = Net::DNS::DomainName1035->new($_) }
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return $self->{exchange} ? $self->{exchange}->name : undef;
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}
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my $function = sub { ## sort RRs in numerically ascending order.
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return $Net::DNS::a->{'preference'} <=> $Net::DNS::b->{'preference'};
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};
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__PACKAGE__->set_rrsort_func( 'preference', $function );
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__PACKAGE__->set_rrsort_func( 'default_sort', $function );
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1;
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__END__
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=head1 SYNOPSIS
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use Net::DNS;
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$rr = Net::DNS::RR->new('name MX preference exchange');
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=head1 DESCRIPTION
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DNS Mail Exchanger (MX) resource record
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=head1 METHODS
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The available methods are those inherited from the base class augmented
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by the type-specific methods defined in this package.
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Use of undocumented package features or direct access to internal data
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structures is discouraged and could result in program termination or
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other unpredictable behaviour.
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=head2 preference
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$preference = $rr->preference;
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$rr->preference( $preference );
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A 16 bit integer which specifies the preference
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given to this RR among others at the same owner.
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Lower values are preferred.
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=head2 exchange
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$exchange = $rr->exchange;
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$rr->exchange( $exchange );
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A domain name which specifies a host willing
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to act as a mail exchange for the owner name.
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=head1 COPYRIGHT
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Copyright (c)1997 Michael Fuhr.
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Portions Copyright (c)2005 Olaf Kolkman, NLnet Labs.
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All rights reserved.
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Package template (c)2009,2012 O.M.Kolkman and R.W.Franks.
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=head1 LICENSE
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Permission to use, copy, modify, and distribute this software and its
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documentation for any purpose and without fee is hereby granted, provided
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that the original copyright notices appear in all copies and that both
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copyright notice and this permission notice appear in supporting
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documentation, and that the name of the author not be used in advertising
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or publicity pertaining to distribution of the software without specific
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prior written permission.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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DEALINGS IN THE SOFTWARE.
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=head1 SEE ALSO
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L<perl> L<Net::DNS> L<Net::DNS::RR>
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L<RFC1035(3.3.9)|https://tools.ietf.org/html/rfc1035>
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=cut
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