Net::DNS::RR::OPT3pm
Dns opt resource record
Usage
use Net::DNS;my $packet = Net::DNS::Packet->new( ... );$packet->header->do(1); # extended header flag$packet->edns->UDPsize(1232); # UDP payload size$packet->edns->option( 'NSID' => {'OPTION-DATA' => 'rawbytes'} );$packet->edns->option( 'DAU' => [8, 10, 13, 14, 15, 16] );$packet->edns->option( 'TCP-KEEPALIVE' => 200 );$packet->edns->option( 'EXTENDED-ERROR' => {'INFO-CODE' => 123} );$packet->edns->option( '65023' => {'BASE16' => '076578616d706c6500'} );$packet->edns->print;;; { "EDNS-VERSION": 0,;; "FLAGS": 32768,;; "RCODE": 0,;; "UDPSIZE": 1232,;; "OPTIONS": [;; {"NSID": "7261776279746573"},;; {"DAU": [ 8, 10, 13, 14, 15, 16 ]},;; {"TCP-KEEPALIVE": {"TIMEOUT": 200}},;; {"EXTENDED-ERROR": {"INFO-CODE": 123, "EXTRA-TEXT": ""}},;; {"65023": {"BASE16": "076578616d706c6500"}} ];; }
Overview
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, or should be, 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 = $packet->edns->version;The version of EDNS supported by this OPT record.
UDPsize
$size = $packet->edns->UDPsize;$packet->edns->UDPsize($size);
UDPsize() 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;The 12 bit extended RCODE. The most significant 8 bits are obtained from the OPT record. The least significant 4 bits reside in the packet header.
flags
$do = $packet->header->do;$packet->header->do(1);$edns_flags = $packet->edns->flags;
16 bit field containing EDNS extended header flags.
options
my @options = $packet->edns->options;When called in a list context, options() returns a list of option codes found in the OPT record.
option
my $octets = $packet->edns->option('COOKIE');my $base16 = unpack 'H*', $octets;
When called in a scalar context with a single argument, option() returns the value of the specified option as an uninterpreted octet string. The method returns undef if the option is absent.
$packet->edns->option( 'COOKIE' => {'OPTION-DATA' => $octets} );$packet->edns->option( '10' => {'BASE16' => $base16} );
An option can be added or replaced by providing the (name,value) pair. The option is deleted if the value is undefined.
my ($structure) = $packet->edns->option("DAU");my $array = $$structure{"DAU"};my @algorithms = @$array;my ($structure) = $packet->edns->option(15);my $table = $$structure{"EXTENDED-ERROR"};my $info_code = $$table{'INFO-CODE'};my $extra_text = $$table{'EXTRA-TEXT'};
When called in a list context with a single argument, option() returns a structured representation of the specified option.
Similar forms of array or hash syntax may be used to construct the option value:
$packet->edns->option( 'DAU' => [8, 10, 13, 14, 15, 16] );$packet->edns->option( 'EXTENDED-ERROR' => {'INFO-CODE' => 123,'EXTRA-TEXT' => ""} );
Releases
12 releases since Debian 3.1 (Sarge); the text changed 11 times.