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Net::DNS::Update(3) User Contributed Perl Documentation Net::DNS::Update(3)
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 cau-
tion 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 mak-
ing 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'));
Perform a signed update
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);
Another way to perform a signed update
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"));
Perform a signed update with a customized TSIG record
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 pro-
duction 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 redis-
tribute 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
perl v5.8.8 2006-09-18 Net::DNS::Update(3)
Man(1) output converted with
man2html and wrapped by fishsponge
This page was generated on Sat Sep 8 16:39:23 GMT 2007
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