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package Net::DNS::RR::MX;
#
# $Id: MX.pm 564 2006-02-20 09:34:26Z olaf $
#
use strict;
BEGIN {
eval { require bytes; }
}
use vars qw(@ISA $VERSION);
@ISA = qw(Net::DNS::RR);
$VERSION = (qw$LastChangedRevision: 564 $)[1];
# Highest preference sorted first.
__PACKAGE__->set_rrsort_func("preference",
sub {
my ($a,$b)=($Net::DNS::a,$Net::DNS::b);
$a->{'preference'} <=> $b->{'preference'}
}
);
__PACKAGE__->set_rrsort_func("default_sort",
__PACKAGE__->get_rrsort_func("preference")
);
sub new {
my ($class, $self, $data, $offset) = @_;
if ($self->{"rdlength"} > 0) {
($self->{"preference"}) = unpack("\@$offset n", $$data);
$offset += Net::DNS::INT16SZ();
($self->{"exchange"}) = Net::DNS::Packet::dn_expand($data, $offset);
}
return bless $self, $class;
}
sub new_from_string {
my ($class, $self, $string) = @_;
if ($string && ($string =~ /^(\d+)\s+(\S+)$/)) {
$self->{"preference"} = $1;
$self->{"exchange"} = $2;
$self->{"exchange"} =~ s/\.+$//;;
}
return bless $self, $class;
}
sub rdatastr {
my $self = shift;
return defined $self->{"preference"}
? "$self->{preference} $self->{exchange}."
: '';
}
sub rr_rdata {
my ($self, $packet, $offset) = @_;
my $rdata = "";
if (exists $self->{"preference"}) {
$rdata .= pack("n", $self->{"preference"});
$rdata .= $packet->dn_comp($self->{"exchange"},
$offset + length $rdata);
}
return $rdata;
}
sub _canonicalRdata {
my ($self) = @_;
my $rdata = "";
if (exists $self->{"preference"}) {
$rdata .= pack("n", $self->{"preference"});
$rdata .= $self->_name2wire($self->{"exchange"})
}
return $rdata;
}
1;
__END__
=head1 NAME
Net::DNS::RR::MX - DNS MX resource record
=head1 SYNOPSIS
C<use Net::DNS::RR>;
=head1 DESCRIPTION
Class for DNS Mail Exchanger (MX) resource records.
=head1 METHODS
=head2 preference
print "preference = ", $rr->preference, "\n";
Returns the preference for this mail exchange.
=head2 exchange
print "exchange = ", $rr->exchange, "\n";
Returns name of this mail exchange.
=head1 COPYRIGHT
Copyright (c) 1997-2002 Michael Fuhr.
Portions Copyright (c) 2002-2004 Chris Reinhardt.
Portions Copyright (c) 2005 Olaf Kolkman NLnet Labs.
All rights reserved. This program is free software; you may redistribute
it and/or modify it under the same terms as Perl itself.
=head1 SEE ALSO
L<perl(1)>, L<Net::DNS>, L<Net::DNS::Resolver>, L<Net::DNS::Packet>,
L<Net::DNS::Header>, L<Net::DNS::Question>, L<Net::DNS::RR>,
RFC 1035 Section 3.3.9
=cut
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