huschi.net

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 = 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.  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 = 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 does not 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)1997-2000 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 v5.26.3                      2018-02-09               Net::DNS::Update(3)