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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 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.	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::Packet" object suitable for performing a DNS dynamic update.  Specif-
       ically, 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 cre-
       ation 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 (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

	   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 production nameservers.

COPYRIGHT
       Copyright (c) 1997-2002 Michael Fuhr.  All rights reserved.  This program is free soft-
       ware; you can 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::Ques-
       tion, Net::DNS::RR, RFC 2136, RFC 2845

perl v5.8.0				    2002-05-30			      Net::DNS::Update(3)
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