NLnet Labs > Net-DNS-0.77 > Net::DNS::RR::OPT

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Module Version: 1194   Source   Latest Release: Net-DNS-0.81

NAME ^

Net::DNS::RR::OPT - DNS OPT resource record

SYNOPSIS ^

    use Net::DNS;
    $opt = new Net::DNS::RR(
        type    => "OPT",  
        flags   => 0x8000,      # extended flags
        rcode   => 0,           # extended RCODE
        size    => 1280,        # UDP payload size
        );

DESCRIPTION ^

EDNS OPT pseudo resource record.

The OPT record supports EDNS protocol extensions and is not intended to be created, accessed or modified directly by user applications.

All access to EDNS features is performed indirectly by operations on the packet header. The underlying mechanism is entirely hidden from the user.

METHODS ^

The available methods are those inherited from the base class augmented by the type-specific methods defined in this package.

Use of undocumented package features or direct access to internal data structures is discouraged and could result in program termination or other unpredictable behaviour.

version

    $version = $rr->version;
    $rr->version( $version );

The version of EDNS used by this OPT record.

size

        $size = $packet->edns->size;
        $more = $packet->edns->size(1280);

size() advertises the maximum size (octets) of UDP packet that can be reassembled in the network stack of the originating host.

rcode

        $extended_rcode   = $packet->header->rcode;
        $incomplete_rcode = $packet->edns->rcode;

The 12 bit extended RCODE. The most significant 8 bits reside in the OPT record. The least significant 4 bits can only be obtained from the packet header.

flags

        $edns_flags = $packet->edns->flags;

        $do = $packet->header->do;
        $packet->header->do(1);

16 bit field containing EDNS extended header flags.

Options

        @option = $packet->edns->options;

        $octets = $packet->edns->option($option_code);

        $packet->edns->option( NSID => 'value' );
        $packet->edns->option( 3    => 'value' );

When called in a list context, options() returns a list of option codes found in the OPT record.

When called with a single argument, option() returns the octet string corresponding to the specified option. The function value is undefined if the specified option is absent.

Options can be changed by providing an argument list containing one or more (name => value) pairs to be added or modified. The effect of such changes is cumulative. An option is deleted if the value is undefined.

COPYRIGHT ^

Copyright (c)2001,2002 RIPE NCC. Author Olaf M. Kolkman.

All Rights Reserved

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 AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS; IN NO EVENT SHALL AUTHOR BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

Portions Copyright (c)2012 Dick Franks.

Package template (c)2009,2012 O.M.Kolkman and R.W.Franks.

SEE ALSO ^

perl, Net::DNS, Net::DNS::RR, RFC6891, RFC3225

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