NAME

       Net::DNS::Update - DNS dynamic update packet

SYNOPSIS

           use Net::DNS;

           $update = new Net::DNS::Update( 'example.com', 'IN' );

           $update->push( prereq => nxrrset('foo.example.com. A') );
           $update->push( update => rr_add('foo.example.com. 86400 A 192.168.1.2') );

DESCRIPTION

       Net::DNS::Update is a subclass of Net::DNS::Packet, to be used for making DNS dynamic
       updates.

       Programmers should refer to RFC2136 for dynamic update semantics.

METHODS

   new
           $update = new Net::DNS::Update;
           $update = new Net::DNS::Update( 'example.com' );
           $update = new Net::DNS::Update( '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.

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

           use Net::DNS;

           # Create the update packet.
           my $update = new Net::DNS::Update('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 $resolver = new Net::DNS::Resolver;
           $resolver->nameservers('primary-master.example.com');

           my $reply = $resolver->send($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: ', $resolver->errorstring, "\n";
           }

   Add an MX record for a name that already exists
           my $update = new Net::DNS::Update('example.com');
           $update->push( prereq => 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 = new Net::DNS::Update('example.com');
           $update->push( prereq => 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 = new Net::DNS::Update('example.com');
           $update->push( prereq => yxrrset('foo.example.com A') );
           $update->push( update => rr_del('foo.example.com A') );

   Delete all RRs for a name
           my $update = new Net::DNS::Update('example.com');
           $update->push( prereq => yxdomain('byebye.example.com') );
           $update->push( update => rr_del('byebye.example.com') );

   Perform a DNS update signed using a BIND private key file
           my $update = new Net::DNS::Update('example.com');
           $update->push( update => rr_add('foo.example.com A 10.1.2.3') );
           $update->sign_tsig( "$dir/Khmac-sha512.example.com.+165+01018.private" );
           my $reply = $resolver->send( $update );
           $reply->verify( $update ) || die $reply->verifyerr;

   Signing the DNS update using a BIND public key file
           $update->sign_tsig( "$dir/Khmac-sha512.example.com.+165+01018.key" );

   Signing the DNS update using a customised TSIG record
           $update->sign_tsig( "$dir/Khmac-sha512.example.com.+165+01018.private",
                               fudge => 60
                               );

   Another way to sign a DNS update
           my $key_name = 'tsig-key';
           my $key      = 'awwLOtRfpGE+rRKF2+DEiw==';

           my $tsig = new Net::DNS::RR("$key_name TSIG $key");
           $tsig->fudge(60);

           my $update = new Net::DNS::Update('example.com');
           $update->push( update     => rr_add('foo.example.com A 10.1.2.3') );
           $update->push( additional => $tsig );

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, Net::DNS, Net::DNS::Packet, Net::DNS::Header, Net::DNS::RR, Net::DNS::Resolver, RFC
       2136, RFC 2845