Net::DNS::Update - Create a DNS update packet
use Net::DNS::Update;
Net::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.
Net::DNS::Update
Net::DNS::Packet
WARNING: This code is still under development and shouldn't be used to maintain a production nameserver.
$packet = new Net::DNS::Update; $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.
push
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.
Net::DNS
The first example below shows a complete program; subsequent examples show only the creation of the update packet.
#!/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"; }
$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"));
$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'"));
$update = new Net::DNS::Update("bar.com"); $update->push("pre", yxrrset("foo.bar.com A")); $update->push("update", rr_del("foo.bar.com A"));
$update = new Net::DNS::Update("foo.com"); $update->push("pre", yxdomain("byebye.foo.com")); $update->push("update", rr_del("byebye.foo.com"));
This code is still under development and shouldn't be used to maintain a production nameserver.
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.
perl(1), Net::DNS, Net::DNS::Resolver, Net::DNS::Header, Net::DNS::Packet, Net::DNS::Question, Net::DNS::RR, RFC 2136
To install Net::DNS, copy and paste the appropriate command in to your terminal.
cpanm
cpanm Net::DNS
CPAN shell
perl -MCPAN -e shell install Net::DNS
For more information on module installation, please visit the detailed CPAN module installation guide.