Net::DNS::Update - phpMan

Che Dong
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 original copyright notices appear in all copies and
    that both 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