Net::DNS::Text(3) User Contributed Perl Documentation Net::DNS::Text(3)NAME
Net::DNS::Text - Domain Name System text representation
SYNOPSIS
use Net::DNS::Text;
$object = new Net::DNS::Text('example');
$string = $object->string;
$object = decode Net::DNS::Text( $data, $offset );
( $object, $next ) = decode Net::DNS::Text( $data, $offset );
$data = $object->encode;
$text = $object->value;
DESCRIPTION
The "Net::DNS::Text" module implements a class of text objects with associated class and instance methods.
Each text object instance has a fixed identity throughout its lifetime.
METHODS
new
$object = new Net::DNS::Text('example');
Creates a text object which encapsulates a single character string component of a resource record.
Arbitrary single-byte characters can be represented by followed by exactly three decimal digits. Such characters are devoid of any
special meaning.
A character preceded by represents itself, without any special interpretation.
decode
$object = decode Net::DNS::Text( $buffer, $offset );
( $object, $next ) = decode Net::DNS::Text( $buffer, $offset );
Creates a text object which represents the decoded data at the indicated offset within the data buffer.
The argument list consists of a reference to a scalar containing the wire-format data and offset of the text data.
The returned offset value indicates the start of the next item in the data buffer.
encode
$data = $object->encode;
Returns the wire-format encoded representation of the text object suitable for inclusion in a DNS packet buffer.
value
$value = $text->value;
Character string representation of the text object.
string
$string = $text->string;
Conditionally quoted zone file representation of the text object.
BUGS
Coding strategy is intended to avoid creating unnecessary argument lists and stack frames. This improves efficiency at the expense of code
readability.
Platform specific character coding features are conditionally compiled into the code.
COPYRIGHT
Copyright (c)2009-2011 Dick Franks.
All rights reserved.
This program is free software; you may redistribute it and/or modify it under the same terms as Perl itself.
SEE ALSO
perl, Net::DNS, RFC1035, RFC3629, Unicode Technical Report #16
perl v5.16.3 2012-12-28 Net::DNS::Text(3)
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Net::DNS::DomainName(3) User Contributed Perl Documentation Net::DNS::DomainName(3)NAME
Net::DNS::DomainName - DNS domain name wire representation
SYNOPSIS
use Net::DNS::DomainName;
$object = new Net::DNS::DomainName('example.com');
$name = $object->name;
$data = $object->encode;
( $object, $next ) = decode Net::DNS::DomainName( $data, $offset );
DESCRIPTION
The Net::DNS::DomainName module implements the concrete representation of DNS domain names used within DNS packets.
Net::DNS::DomainName defines methods for encoding and decoding wire format octet strings as defined in RFC1035. All other behaviour,
including the new() constructor, is inherited from Net::DNS::Domain.
The Net::DNS::DomainName1035 and Net::DNS::DomainName2535 packages implement disjoint domain name subtypes which provide the name
compression and canonicalisation specified by RFC1035 and RFC2535. These are necessary to meet the backward compatibility requirements
introduced by RFC3597.
METHODS
new
$object = new Net::DNS::DomainName('example.com');
Creates a domain name object which identifies the domain specified by the character string argument.
decode
$object = decode Net::DNS::DomainName( $buffer, $offset, $hash );
( $object, $next ) = decode Net::DNS::DomainName( $buffer, $offset, $hash );
Creates a domain name object which represents the DNS domain name identified by the wire-format data at the indicated offset within the
data buffer.
The argument list consists of a reference to a scalar containing the wire-format data and specified offset. The optional reference to a
hash table provides improved efficiency of decoding compressed names by exploiting already cached compression pointers.
The returned offset value indicates the start of the next item in the data buffer.
encode
$data = $object->encode;
Returns the wire-format representation of the domain name suitable for inclusion in a DNS packet buffer.
Net::DNS::DomainName1035
Net::DNS::DomainName1035 implements a subclass of domain name objects which are to be encoded using the compressed wire format defined in
RFC1035.
use Net::DNS::DomainName;
$object = new Net::DNS::DomainName1035('compressible.example.com');
$data = $object->encode( $offset, $hash );
( $object, $next ) = decode Net::DNS::DomainName1035( $data, $offset );
Note that RFC3597 implies that the RR types defined in RFC1035 section 3.3 are the only types eligible for compression.
encode
$data = $object->encode( $offset, $hash );
Returns the wire-format representation of the domain name suitable for inclusion in a DNS packet buffer.
The optional arguments are the offset within the packet data where the domain name is to be stored and a reference to a hash table used to
index compressed names within the packet.
If the hash reference is undefined, encode() returns the lowercase uncompressed canonical representation defined in RFC2535(8.1).
Net::DNS::DomainName2535
Net::DNS::DomainName2535 implements a subclass of domain name objects which are to be encoded using uncompressed wire format.
Note that RFC3597, and latterly RFC4034, specifies that the lower case canonical encoding defined in RFC2535 is to be used for RR types
defined prior to RFC3597.
use Net::DNS::DomainName;
$object = new Net::DNS::DomainName2535('incompressible.example.com');
$data = $object->encode( $offset, $hash );
( $object, $next ) = decode Net::DNS::DomainName2535( $data, $offset );
encode
$data = $object->encode( $offset, $hash );
Returns the uncompressed wire-format representation of the domain name suitable for inclusion in a DNS packet buffer.
If the hash reference is undefined, encode() returns the lowercase canonical form defined in RFC2535(8.1).
COPYRIGHT
Copyright (c)2009-2011 Dick Franks.
All rights reserved.
This program is free software; you may redistribute it and/or modify it under the same terms as Perl itself.
SEE ALSO
perl, Net::DNS, Net::DNS::Domain, RFC1035, RFC2535, RFC3597, RFC4034
perl v5.16.2 2012-01-27 Net::DNS::DomainName(3)