Net::DNS::RR::OPT(3pm)User Contributed Perl DocumentatioNet::DNS::RR::OPT(3pm)NAMENet::DNS::RR::OPT - DNS OPT resource record
SYNOPSIS
use Net::DNS;
$packet = new Net::DNS::Packet( ... );
$packet->header->do(1); # extended flag
$packet->edns->size(1280); # UDP payload size
$packet->edns->option( COOKIE => $cookie );
$packet->edns->print;
;; EDNS version 0
;; flags: 8000
;; rcode: NOERROR
;; size: 1280
;; option: COOKIE => ( 7261776279746573 )
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 EDNS features are performed indirectly by operations on the objects
returned by the $packet->header and $packet->edns creator methods. The
underlying mechanisms are 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;
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
@option = $packet->edns->options;
$octets = $packet->edns->option($option_code);
$packet->edns->option( COOKIE => $cookie );
$packet->edns->option( 10 => $cookie );
When called in a list context, options() returns a list of option codes
found in the OPT record.
When called in a scalar context with a single argument, option()
returns the uninterpreted octet string corresponding to the specified
option. The method returns undef if the specified option is absent.
Options can be added or replaced by providing the (name => string)
pair. The option is deleted if the value is undefined.
When option() is called in a list context with a single argument, the
returned array provides a structured interpretation appropriate to the
specified option.
For the example above:
%hash = $packet->edns->option(10);
{
'CLIENT-COOKIE' => 'rawbytes',
'SERVER-COOKIE' => undef
};
For some options, an array is more appropriate:
@algorithms = $packet->edns->option(6);
Similar forms of array syntax may be used to construct the option
value:
$packet->edns->option( DHU => [1, 2, 4] );
$packet->edns->option( 6 => (1, 2, 4) );
$packet->edns->option( COOKIE => {'CLIENT-COOKIE' => $cookie} );
$packet->edns->option( 10 => ('CLIENT-COOKIE' => $cookie) );
COPYRIGHT
Copyright (c)2001,2002 RIPE NCC. Author Olaf M. Kolkman.
Portions Copyright (c)2012,2017 Dick Franks.
All rights reserved.
Package template (c)2009,2012 O.M.Kolkman and R.W.Franks.
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::RR, RFC6891, RFC3225
perl v5.26.0 2017-07-31 Net::DNS::RR::OPT(3pm)
