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Net::DNS::Update(3)   User Contributed Perl Documentation  Net::DNS::Update(3)

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

SYNOPSIS
	   use Net::DNS;

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

	   $update->push( prereq => nxrrset('host.example.com. AAAA') );
	   $update->push( update => rr_add('host.example.com. 86400 AAAA 2001::DB8::F00') );

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

       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 and
       update sections before performing the update.

       Arguments are the zone name and the class.  The zone and	class may be
       undefined or omitted and	default	to the default domain from the
       resolver	configuration and IN respectively.

   push
	   $ancount = $update->push( prereq => $rr );
	   $nscount = $update->push( update => $rr );
	   $arcount = $update->push( additional	=> $rr );

	   $nscount = $update->push( update => $rr1, $rr2, $rr3	);
	   $nscount = $update->push( update => @rr );

       Adds RRs	to the specified section of the	update packet.

       Returns the number of resource records in the specified section.

       Section names may be abbreviated	to the first three characters.

   unique_push
	   $ancount = $update->unique_push( prereq => $rr );
	   $nscount = $update->unique_push( update => $rr );
	   $arcount = $update->unique_push( additional => $rr );

	   $nscount = $update->unique_push( update => $rr1, $rr2, $rr3 );
	   $nscount = $update->unique_push( update => @rr );

       Adds RRs	to the specified section of the	update packet provided that
       the RRs are not already present in the same section.

       Returns the number of resource records in the specified section.

       Section names may be abbreviated	to the first three characters.

EXAMPLES
       The first example below shows a complete	program.  Subsequent examples
       show only the creation of the update packet.

       Although	the examples are presented using the string form of RRs, the
       corresponding ( name => value ) form may	also be	used.

   Add a new host
	   #!/usr/bin/perl

	   use Net::DNS;

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

	   # Prerequisite is that no address records exist for the name.
	   $update->push( pre => nxrrset('host.example.com. A')	);
	   $update->push( pre => nxrrset('host.example.com. AAAA') );

	   # Add two address records for the name.
	   $update->push( update => rr_add('host.example.com. 86400 A 192.0.2.1') );
	   $update->push( update => rr_add('host.example.com. 86400 AAAA 2001:DB8::1') );

	   # Send the update to	the zone's primary nameserver.
	   my $resolver	= Net::DNS::Resolver->new();
	   $resolver->nameservers('DNSprimary.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 =	Net::DNS::Update->new('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 does not exist
	   my $update =	Net::DNS::Update->new('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 =	Net::DNS::Update->new('example.com');
	   $update->push( prereq => yxrrset('host.example.com A') );
	   $update->push( update => rr_del('host.example.com A') );

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

   Perform DNS update signed using a key generated by BIND tsig-keygen
	   my $update =	Net::DNS::Update->new('example.com');
	   $update->push( update => rr_add('host.example.com AAAA 2001:DB8::1')	);
	   $update->sign_tsig( $key_file );
	   my $reply = $resolver->send(	$update	);
	   $reply->verify( $update ) ||	die $reply->verifyerr;

   Signing the DNS update using	a customised TSIG record
	   $update->sign_tsig( $key_file, fudge	=> 60 );

   Signing the DNS update using	private	key generated by BIND dnssec-keygen
	   $update->sign_tsig( "$dir/Khmac-sha512.example.com.+165+01018.private" );

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

   Another way to sign a DNS update
	   use Net::DNS::RR::TSIG;

	   my $tsig = create Net::DNS::RR::TSIG( $key_file );
	   $tsig->fudge(60);

	   my $update =	Net::DNS::Update->new('example.com');
	   $update->push( update     =>	rr_add('host.example.com AAAA 2001:DB8::1') );
	   $update->push( additional =>	$tsig );

COPYRIGHT
       Copyright (c)1997-2000 Michael Fuhr.

       Portions	Copyright (c)2002,2003 Chris Reinhardt.

       Portions	Copyright (c)2015 Dick Franks.

       All rights reserved.

LICENSE
       Permission to use, copy,	modify,	and distribute this software and its
       documentation for any purpose and without fee is	hereby granted,
       provided	that the above copyright notice	appear in all copies and that
       both that copyright notice and this permission notice appear in
       supporting documentation, and that the name of the author not be	used
       in advertising or publicity pertaining to distribution of the software
       without specific	prior written permission.

       THE SOFTWARE IS PROVIDED	"AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
       OR IMPLIED, INCLUDING BUT NOT LIMITED TO	THE WARRANTIES OF
       MERCHANTABILITY,	FITNESS	FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
       IN NO EVENT SHALL THE AUTHORS OR	COPYRIGHT HOLDERS BE LIABLE FOR	ANY
       CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN	ACTION OF CONTRACT,
       TORT OR OTHERWISE, ARISING FROM,	OUT OF OR IN CONNECTION	WITH THE
       SOFTWARE	OR THE USE OR OTHER DEALINGS IN	THE SOFTWARE.

SEE ALSO
       perl, Net::DNS, Net::DNS::Packet, Net::DNS::Header, Net::DNS::RR,
       Net::DNS::Resolver, RFC 2136, RFC 2845

perl v5.32.1			  2021-05-02		   Net::DNS::Update(3)

NAME | SYNOPSIS | DESCRIPTION | METHODS | EXAMPLES | COPYRIGHT | LICENSE | SEE ALSO

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