NAME¶
Net::DNS::Update - Create a DNS update packet
SYNOPSIS¶
"use Net::DNS::Update;"
DESCRIPTION¶
"Net::DNS::Update" is a subclass of "Net::DNS::Packet", to
be used for making DNS dynamic updates. Programmers should refer to RFC 2136
for the semantics of dynamic updates.
WARNING: This code is still under development. Please use with caution on
production nameservers.
METHODS¶
new¶
$packet = Net::DNS::Update->new;
$packet = Net::DNS::Update->new('example.com');
$packet = Net::DNS::Update->new('example.com', 'HS');
Returns a "Net::DNS::Update" object suitable for performing a DNS
dynamic update. Specifically, it creates a packet with the header opcode set
to UPDATE and the zone record type to SOA (per RFC 2136, Section 2.3).
Programs must use the "push" method to add RRs to the prerequisite,
update, and additional sections before performing the update.
Arguments are the zone name and the class. If the zone is omitted, the default
domain will be taken from the resolver configuration. If the class is omitted,
it defaults to IN.
Future versions of "Net::DNS" may provide a simpler interface for
making dynamic updates.
EXAMPLES¶
The first example below shows a complete program; subsequent examples show only
the creation of the update packet.
Add a new host¶
#!/usr/bin/perl -w
use Net::DNS;
use strict;
# Create the update packet.
my $update = Net::DNS::Update->new('example.com');
# Prerequisite is that no A records exist for the name.
$update->push(pre => nxrrset('foo.example.com. A'));
# Add two A records for the name.
$update->push(update => rr_add('foo.example.com. 86400 A 192.168.1.2'));
$update->push(update => rr_add('foo.example.com. 86400 A 172.16.3.4'));
# Send the update to the zone's primary master.
my $res = Net::DNS::Resolver->new;
$res->nameservers('primary-master.example.com');
my $reply = $res->send($update);
# Did it work?
if ($reply) {
if ($reply->header->rcode eq 'NOERROR') {
print "Update succeeded\n";
} else {
print 'Update failed: ', $reply->header->rcode, "\n";
}
} else {
print 'Update failed: ', $res->errorstring, "\n";
}
Add an MX record for a name that already exists¶
my $update = Net::DNS::Update->new('example.com');
$update->push(pre => yxdomain('example.com'));
$update->push(update => rr_add('example.com MX 10 mailhost.example.com'));
Add a TXT record for a name that doesn't exist¶
my $update = Net::DNS::Update->new('example.com');
$update->push(pre => nxdomain('info.example.com'));
$update->push(update => rr_add('info.example.com TXT "yabba dabba doo"'));
Delete all A records for a name¶
my $update = Net::DNS::Update->new('example.com');
$update->push(pre => yxrrset('foo.example.com A'));
$update->push(update => rr_del('foo.example.com A'));
Delete all RRs for a name¶
my $update = Net::DNS::Update->new('example.com');
$update->push(pre => yxdomain('byebye.example.com'));
$update->push(update => rr_del('byebye.example.com'));
my $key_name = 'tsig-key';
my $key = 'awwLOtRfpGE+rRKF2+DEiw==';
my $update = Net::DNS::Update->new('example.com');
$update->push(update => rr_add('foo.example.com A 10.1.2.3'));
$update->push(update => rr_add('bar.example.com A 10.4.5.6'));
$update->sign_tsig($key_name, $key);
my $key_name = 'tsig-key';
my $key = 'awwLOtRfpGE+rRKF2+DEiw==';
my $update = Net::DNS::Update->new('example.com');
$update->push(update => rr_add('foo.example.com A 10.1.2.3'));
$update->push(update => rr_add('bar.example.com A 10.4.5.6'));
$update->push(additional => Net::DNS::RR->new("$key_name TSIG $key"));
my $key_name = 'tsig-key';
my $key = 'awwLOtRfpGE+rRKF2+DEiw==';
my $tsig = Net::DNS::RR->new("$key_name TSIG $key");
$tsig->fudge(60);
my $update = Net::DNS::Update->new('example.com');
$update->push(update => rr_add('foo.example.com A 10.1.2.3'));
$update->push(update => rr_add('bar.example.com A 10.4.5.6'));
$update->push(additional => $tsig);
BUGS¶
This code is still under development. Please use with caution on production
nameservers.
COPYRIGHT¶
Copyright (c) 1997-2002 Michael Fuhr.
Portions Copyright (c) 2002-2004 Chris Reinhardt.
All rights reserved. This program is free software; you may redistribute it
and/or modify it under the same terms as Perl itself.
SEE ALSO¶
perl(1), Net::DNS, Net::DNS::Resolver, Net::DNS::Header,
Net::DNS::Packet, Net::DNS::Question, Net::DNS::RR, RFC 2136, RFC 2845