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Net::DNS::RR::OPT(3pm) User Contributed Perl Documentation Net::DNS::RR::OPT(3pm)
NAME
Net::DNS::RR::OPT - DNS OPT resource record
SYNOPSIS
use Net::DNS;
$packet = Net::DNS::Packet->new( ... );
$packet->header->do(1); # extended flag
$packet->edns->size(1280); # UDP payload size
$packet->edns->option( COOKIE => 'rawbytes' );
$packet->edns->print;
;; EDNS version 0
;; flags: 8000
;; rcode: NOERROR
;; size: 1280
;; option: COOKIE => ( 7261776279746573 )
;; DAU => ( 8, 10, 13, 14, 15, 16 )
;; DHU => ( 1, 2, 4 )
;; EXTENDED-ERROR => ( INFO-CODE => 123, EXTRA-TEXT => )
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;
$rr->version( $version );
The version of EDNS supported 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 => $octets );
$packet->edns->option( 10 => $octets );
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 => value) pair. The option is
deleted if the value is undefined.
When option() is called in a list context with a single argument, the returned values
provide a structured interpretation appropriate to the specified option.
For example:
@algorithms = $packet->edns->option('DAU');
For some options, a hash table is more convenient:
%hash_table = $packet->edns->option(15);
$info_code = $hash_table{'INFO-CODE'};
$extra_text = $hash_table{'EXTRA-TEXT'};
Similar forms of array or hash syntax may be used to construct the option value:
$packet->edns->option( DHU => [1, 2, 4] );
$packet->edns->option( EXPIRE => {'EXPIRE-TIMER' => 604800} );
COPYRIGHT
Copyright (c)2001,2002 RIPE NCC. Author Olaf M. Kolkman.
Portions Copyright (c)2012,2017-2020 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 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::RR, RFC6891, RFC3225
perl v5.32.1 2021-12-18 Net::DNS::RR::OPT(3pm)
Generated by $Id: phpMan.php,v 4.55 2007/09/05 04:42:51 chedong Exp $ Author: Che Dong
On Apache
Under GNU General Public License
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