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package Net::DNS::Question;
use strict;
use vars qw($VERSION $AUTOLOAD);
use Carp;
use Net::DNS;
# $Id: Question.pm,v 1.7 2001/02/07 05:14:27 mfuhr Exp mfuhr $
$VERSION = $Net::DNS::VERSION;
=head1 NAME
Net::DNS::Question - DNS question class
=head1 SYNOPSIS
C<use Net::DNS::Question>
=head1 DESCRIPTION
A C<Net::DNS::Question> object represents a record in the
question section of a DNS packet.
=head1 METHODS
=head2 new
$question = Net::DNS::Question->new("example.com", "MX", "IN");
Creates a question object from the domain, type, and class passed
as arguments.
=cut
sub new {
my $class = shift;
my %self = (
"qname" => undef,
"qtype" => undef,
"qclass" => undef,
);
my ($qname, $qtype, $qclass) = @_;
$qname = "" if !defined($qname);
$qtype = defined($qtype) ? uc($qtype) : "ANY";
$qclass = defined($qclass) ? uc($qclass) : "ANY";
# Check if the caller has the type and class reversed.
if ((!exists $Net::DNS::typesbyname{$qtype} ||
!exists $Net::DNS::classesbyname{$qclass})
&& exists $Net::DNS::classesbyname{$qtype}
&& exists $Net::DNS::typesbyname{$qclass}) {
($qtype, $qclass) = ($qclass, $qtype);
}
$qname =~ s/^\.+//;
$qname =~ s/\.+$//;
$self{"qname"} = $qname;
$self{"qtype"} = $qtype;
$self{"qclass"} = $qclass;
bless \%self, $class;
}
#
# Some people have reported that Net::DNS dies because AUTOLOAD picks up
# calls to DESTROY.
#
sub DESTROY {}
=head2 qname, zname
print "qname = ", $question->qname, "\n";
print "zname = ", $question->zname, "\n";
Returns the domain name. In dynamic update packets, this field is
known as C<zname> and refers to the zone name.
=head2 qtype, ztype
print "qtype = ", $question->qtype, "\n";
print "ztype = ", $question->ztype, "\n";
Returns the record type. In dymamic update packets, this field is
known as C<ztype> and refers to the zone type (must be SOA).
=head2 qclass, zclass
print "qclass = ", $question->qclass, "\n";
print "zclass = ", $question->zclass, "\n";
Returns the record class. In dynamic update packets, this field is
known as C<zclass> and refers to the zone's class.
=cut
sub AUTOLOAD {
my $self = shift;
my $name = $AUTOLOAD;
$name =~ s/.*://;
Carp::confess "$name: no such method" unless exists $self->{$name};
return $self->{$name};
}
sub zname { my $self = shift; $self->qname(@_); }
sub ztype { my $self = shift; $self->qtype(@_); }
sub zclass { my $self = shift; $self->qclass(@_); }
=head2 print
$question->print;
Prints the question record on the standard output.
=cut
sub print {
my $self = shift;
print $self->string, "\n";
}
=head2 string
print $qr->string, "\n";
Returns a string representation of the question record.
=cut
sub string {
my $self = shift;
return "$self->{qname}.\t$self->{qclass}\t$self->{qtype}";
}
=head2 data
$qdata = $question->data($packet, $offset);
Returns the question record in binary format suitable for inclusion
in a DNS packet.
Arguments are a C<Net::DNS::Packet> object and the offset within
that packet's data where the C<Net::DNS::Question> record is to
be stored. This information is necessary for using compressed
domain names.
=cut
sub data {
my ($self, $packet, $offset) = @_;
my $data = $packet->dn_comp($self->{"qname"}, $offset);
$data .= pack("n", $Net::DNS::typesbyname{uc($self->{"qtype"})});
$data .= pack("n", $Net::DNS::classesbyname{uc($self->{"qclass"})});
return $data;
}
=head1 COPYRIGHT
Copyright (c) 1997-2000 Michael Fuhr. All rights reserved. This
program is free software; you can 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::Update>, L<Net::DNS::Header>, L<Net::DNS::RR>,
RFC 1035 Section 4.1.2
=cut
1;
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