Net::DNS::Domain(3) User Contributed Perl Documentation Net::DNS::Domain(3)
NAME
Net::DNS::Domain - DNS domains
SYNOPSIS
use Net::DNS::Domain;
$domain = Net::DNS::Domain->new('example.com');
$name = $domain->name;
DESCRIPTION
The Net::DNS::Domain module implements a class of abstract DNS domain
objects with associated class and instance methods.
Each domain object instance represents a single DNS domain which has a
fixed identity throughout its lifetime.
Internally, the primary representation is a (possibly empty) list of
ASCII domain name labels, and optional link to an origin domain object
topologically closer to the DNS root.
The computational expense of Unicode character-set conversion is
partially mitigated by use of caches.
METHODS
new
$object = Net::DNS::Domain->new('example.com');
Creates a domain object which represents the DNS domain specified by
the character string argument. The argument consists of a sequence of
labels delimited by dots.
A character preceded by \ represents itself, without any special
interpretation.
Arbitrary 8-bit codes can be represented by \ followed by exactly three
decimal digits. Character code points are ASCII, irrespective of the
character coding scheme employed by the underlying platform.
Argument string literals should be delimited by single quotes to avoid
escape sequences being interpreted as octal character codes by the Perl
compiler.
The character string presentation format follows the conventions for
zone files described in RFC1035.
Users should be aware that non-ASCII domain names will be transcoded to
NFC before encoding, which is an irreversible process.
name
$name = $domain->name;
Returns the domain name as a character string corresponding to the
"common interpretation" to which RFC1034, 3.1, paragraph 9 alludes.
Character escape sequences are used to represent a dot inside a domain
name label and the escape character itself.
Any non-printable code point is represented using the appropriate
numerical escape sequence.
fqdn
@fqdn = $domain->fqdn;
Returns a character string containing the fully qualified domain name,
including the trailing dot.
xname
$xname = $domain->xname;
Interprets an extended name containing Unicode domain name labels
encoded as Punycode A-labels.
If decoding is not possible, the ACE encoded name is returned.
label
@label = $domain->label;
Identifies the domain by means of a list of domain labels.
string
$string = $object->string;
Returns a character string containing the fully qualified domain name
as it appears in a zone file.
Characters which are recognised by RFC1035 zone file syntax are
represented by the appropriate escape sequence.
origin
$create = Net::DNS::Domain->origin( $ORIGIN );
$result = &$create( sub{ Net::DNS::RR->new( 'mx MX 10 a' ); } );
$expect = Net::DNS::RR->new( "mx.$ORIGIN. MX 10 a.$ORIGIN." );
Class method which returns a reference to a subroutine wrapper which
executes a given constructor in a dynamically scoped context where
relative names become descendents of the specified $ORIGIN.
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)2009-2011,2017 Dick Franks.
All rights reserved.
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(1), Net::LibIDN2(3), Net::DNS(3), RFC1034, RFC1035, RFC5891,
Unicode Technical Report #16
perl v5.30.3 2020-11-18 Net::DNS::Domain(3)
net-dns 1.290.0 - Generated Sat Nov 21 13:44:49 CST 2020