lib::Net::DNS::UsertContributed Perl Doculib::Net::DNS::Update(3)NAMENet::DNS::Update - Create a DNS update packet
SYNOPSIS
use Net::DNS::Update;
DESCRIPTIONNet::DNS::Update is a front-end for creating
Net::DNS::Packet objects 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 and
shouldn't be used to maintain a production nameserver.
METHODS
new
$packet = new Net::DNS::Update("foo.com");
$packet = new Net::DNS::Update("foo.com", "HS");
Returns a Net::DNS::Packet 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 omitted,
the class 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
24/Aug/1997 perl 5.005, patch 03 1
lib::Net::DNS::UsertContributed Perl Doculib::Net::DNS::Update(3)
#!/usr/local/bin/perl -w
use Net::DNS;
# Create the update packet.
$update = new Net::DNS::Update("bar.com");
# Prerequisite is that no A records exist for the name.
$update->push("pre", nxrrset("foo.bar.com. A"));
# Add two A records for the name.
$update->push("update", rr_add("foo.bar.com. 86400 A 192.168.1.2"));
$update->push("update", rr_add("foo.bar.com. 86400 A 172.16.3.4"));
# Send the update to the zone's primary master.
$res = new Net::DNS::Resolver;
$res->nameservers("primary-master.bar.com");
$reply = $res->send($update);
# Did it work?
if (defined $reply) {
if ($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
$update = new Net::DNS::Update("foo.com");
$update->push("pre", yxdomain("foo.com"));
$update->push("update", rr_add("foo.com MX 10 mailhost.foo.com"));
Add a TXT record for a name that doesn't exist
$update = new Net::DNS::Update("foo.com");
$update->push("pre", nxdomain("info.foo.com"));
$update->push("update", rr_add("info.foo.com TXT 'yabba dabba doo'"));
Delete all A records for a name
24/Aug/1997 perl 5.005, patch 03 2
lib::Net::DNS::UsertContributed Perl Doculib::Net::DNS::Update(3)
$update = new Net::DNS::Update("bar.com");
$update->push("pre", yxrrset("foo.bar.com A"));
$update->push("update", rr_del("foo.bar.com A"));
Delete all RRs for a name
$update = new Net::DNS::Update("foo.com");
$update->push("pre", yxdomain("byebye.foo.com"));
$update->push("update", rr_del("byebye.foo.com"));
BUGS
This code is still under development and shouldn't be used
to maintain a production nameserver.
COPYRIGHT
Copyright (c) 1997 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.
SEE ALSO
the perl(1) manpage, the Net::DNS manpage, the
Net::DNS::Resolver manpage, the Net::DNS::Header manpage,
the Net::DNS::Packet manpage, the Net::DNS::Question
manpage, the Net::DNS::RR manpage, RFC 2136
24/Aug/1997 perl 5.005, patch 03 3
