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package Net::DNS::RR::TKEY;
#
# $Id: TKEY.pm 388 2005-06-22 10:06:05Z olaf $
#
use strict;
BEGIN {
eval { require bytes; }
}
use vars qw(@ISA $VERSION);
use Digest::HMAC_MD5;
use MIME::Base64;
@ISA = qw(Net::DNS::RR);
$VERSION = (qw$LastChangedRevision: 388 $)[1];
sub new {
my ($class, $self, $data, $offset) = @_;
# if we have some data then we are parsing an incoming TKEY packet
# see RFC2930 for the packet format
if ($self->{"rdlength"} > 0) {
($self->{"algorithm"}, $offset) = Net::DNS::Packet::dn_expand($data, $offset);
@{$self}{qw(inception expiration)} = unpack("\@$offset NN", $$data);
$offset += Net::DNS::INT32SZ() + Net::DNS::INT32SZ();
@{$self}{qw(inception expiration)} = unpack("\@$offset nn", $$data);
$offset += Net::DNS::INT16SZ() + Net::DNS::INT16SZ();
my ($key_len) = unpack("\@$offset n", $$data);
$offset += Net::DNS::INT16SZ();
$self->{"key"} = substr($$data, $offset, $key_len);
$offset += $key_len;
my ($other_len) = unpack("\@$offset n", $$data);
$offset += Net::DNS::INT16SZ();
$self->{"other_data"} = substr($$data, $offset, $other_len);
$offset += $other_len;
}
return bless $self, $class;
}
sub new_from_string {
my ($class, $self, $string) = @_;
if ($string && ($string =~ /^(.*)$/)) {
$self->{"key"} = $1;
}
$self->{"algorithm"} = "gss.microsoft.com";
$self->{"inception"} = time;
$self->{"expiration"} = time + 24*60*60;
$self->{"mode"} = 3; # GSSAPI
$self->{"error"} = 0;
$self->{"other_len"} = 0;
$self->{"other_data"} = "";
return bless $self, $class;
}
sub error {
my $self = shift;
my $rcode;
my $error = $self->{"error"};
if (defined($error)) {
$rcode = $Net::DNS::rcodesbyval{$error} || $error;
}
return $rcode;
}
sub rdatastr {
my $self = shift;
my $error = $self->error;
$error = "UNDEFINED" unless defined $error;
my $rdatastr;
if (exists $self->{"algorithm"}) {
$rdatastr = "$self->{algorithm}. $error";
if ($self->{"other_len"} && defined($self->{"other_data"})) {
$rdatastr .= " $self->{other_data}";
}
} else {
$rdatastr = '';
}
return $rdatastr;
}
sub rr_rdata {
my ($self, $packet, $offset) = @_;
my $rdata = "";
$packet->{"compnames"} = {};
$rdata .= $packet->dn_comp($self->{"algorithm"}, 0);
$rdata .= pack("N", $self->{"inception"});
$rdata .= pack("N", $self->{"expiration"});
$rdata .= pack("n", $self->{"mode"});
$rdata .= pack("n", 0); # error
$rdata .= pack("n", length($self->{"key"}));
$rdata .= $self->{"key"};
$rdata .= pack("n", length($self->{"other_data"}));
$rdata .= $self->{"other_data"};
return $rdata;
}
1;
__END__
=head1 NAME
Net::DNS::RR::TKEY - DNS TKEY resource record
=head1 SYNOPSIS
C<use Net::DNS::RR>;
=head1 DESCRIPTION
Class for DNS TKEY resource records.
=head1 METHODS
=head2 algorithm
$rr->algorithm($algorithm_name);
print "algorithm = ", $rr->algorithm, "\n";
Gets or sets the domain name that specifies the name of the algorithm.
The default algorithm is gss.microsoft.com
=head2 inception
$rr->inception(time);
print "inception = ", $rr->inception, "\n";
Gets or sets the inception time as the number of seconds since 1 Jan 1970
00:00:00 UTC.
The default inception time is the current time.
=head2 expiration
$rr->expiration(time);
print "expiration = ", $rr->expiration, "\n";
Gets or sets the expiration time as the number of seconds since 1 Jan 1970
00:00:00 UTC.
The default expiration time is the current time plus 1 day.
=head2 mode
$rr->mode(3);
print "mode = ", $rr->mode, "\n";
Sets the key mode (see rfc2930). The default is 3 which corresponds to GSSAPI
=head2 error
print "error = ", $rr->error, "\n";
Returns the RCODE covering TKEY processing. See RFC 2930 for details.
=head2 other_len
print "other len = ", $rr->other_len, "\n";
Returns the length of the Other Data. Should be zero.
=head2 other_data
print "other data = ", $rr->other_data, "\n";
Returns the Other Data. This field should be empty.
=head1 BUGS
This code has not been extensively tested. Use with caution on
production systems. See http://samba.org/ftp/samba/tsig-gss/ for an
example usage.
=head1 COPYRIGHT
Copyright (c) 2000 Andrew Tridgell. All rights reserved. This program
is free software; you can redistribute it and/or modify it under
the same terms as Perl itself.
=head1 ACKNOWLEDGMENT
The Net::DNS::RR::TKEY module is based on the TSIG module by Michael
Fuhr and Chris Turbeville.
=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 2845
=cut
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