Net::DNS::RR - DNS Resource Record class

CWuse Net::DNS::RR

CWNet::DNS::RR is the base class for DNS Resource Record (RR) objects. See also the manual pages for each RR type.

WARNING!!! Don't assume the RR objects you receive from a query are of a particular type always check an object's type before calling any of its methods. If you call an unknown method, you'll get a nasty warning message and CWNet::DNS::RR will return CWundef to the caller.

 $a     = Net::DNS::RR->new("foo.example.com. 86400 A 10.1.2.3");
 $mx    = Net::DNS::RR->new("example.com. 7200 MX 10 mailhost.example.com.");
 $cname = Net::DNS::RR->new("www.example.com 300 IN CNAME www1.example.com");
 $txt   = Net::DNS::RR->new("baz.example.com 3600 HS TXT 'text record'");

Returns a CWNet::DNS::RR object of the appropriate type and initialized from the string passed by the user. The format of the string is that used in zone files, and is compatible with the string returned by CWNet::DNS::RR->string.

The name and RR type are required; all other information is optional. If omitted, the TTL defaults to 0 and the RR class defaults to IN. Omitting the optional fields is useful for creating the empty RDATA sections required for certain dynamic update operations. See the CWNet::DNS::Update manual page for additional examples.

All names must be fully qualified. The trailing dot (.) is optional.

 $rr = Net::DNS::RR->new(
         name    => "foo.example.com",
         ttl     => 86400,
         class   => "IN",
         type    => "A",
         address => "10.1.2.3",
 );

 $rr = Net::DNS::RR->new(
         name => "foo.example.com",
         type => "A",
 );

Returns an RR object of the appropriate type, or a CWNet::DNS::RR object if the type isn't implemented. See the manual pages for each RR type to see what fields the type requires.

The CWName and CWType fields are required; all others are optional. If omitted, CWTTL defaults to 0 and CWClass defaults to IN. Omitting the optional fields is useful for creating the empty RDATA sections required for certain dynamic update operations.

The fields are case-insensitive, but starting each with uppercase is recommended.

    $rr->print;

Prints the record to the standard output. Calls the string method to get the RR's string representation.

    print $rr->string, "\n";

Returns a string representation of the RR. Calls the rdatastr method to get the RR-specific data.

    $s = $rr->rdatastr;

Returns a string containing RR-specific data. Subclasses will need to implement this method.

    $name = $rr->name;

Returns the record's domain name.

    $type = $rr->type;

Returns the record's type.

    $class = $rr->class;

Returns the record's class.

    $ttl = $rr->ttl;

Returns the record's time-to-live (TTL).

    $rdlength = $rr->rdlength;

Returns the length of the record's data section.

    $rdata = $rr->rdata

Returns the record's data section as binary data.

This version of CWNet::DNS::RR does little sanity checking on user-created RR objects.

Copyright (c) 1997-2002 Michael Fuhr.

Portions Copyright (c) 2002-2004 Chris Reinhardt.

Portions Copyright (c) 2005 Olaf Kolkman

All rights reserved. This program is free software; you may redistribute it and/or modify it under the same terms as Perl itself.

EDNS0 extensions by Olaf Kolkman.

perl(1), Net::DNS, Net::DNS::Resolver, Net::DNS::Packet, Net::DNS::Update, Net::DNS::Header, Net::DNS::Question, RFC 1035 Section 4.1.3