NAME

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

SYNOPSIS

       use Net::DNS;

           $rr = new Net::DNS::RR('example.com IN A 192.0.2.99');

           $rr = new Net::DNS::RR(
                   name    => 'example.com'
                   type    => 'A',
                   address => '192.0.2.99'
                   );

DESCRIPTION

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

METHODS

       WARNING!!!  Do not assume the RR objects you receive from a query are of a particular type
       -- always check the object type before calling any of its methods.  If you call an unknown
       method, you will get an error message and execution will be terminated.

   new (from string)
        $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 "Net::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 "Net::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
       "Net::DNS::Update" manual page for additional examples.

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

   new (from hash)
        $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 "Net::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 "Name" and "Type" fields are required; all others are optional.  If omitted, "TTL"
       defaults to 0 and "Class" 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.

   decode
           ($rrobj, $offset) = Net::DNS::RR->decode(\$data, $offset);

       Decodes a DNS resource record at the specified location within a DNS packet.  The first
       argument is a reference to the packet data.  The second argument is the offset within the
       packet where the resource record begins.

       Returns a Net::DNS::RR object and the offset of the next location in the packet.

       Decoding is aborted if the object could not be created (e.g., corrupt or insufficient
       data).

   print
           $rr->print;

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

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

       Returns a string representation of the RR.  Calls the rdatastr method to get the RR-
       specific data. Domain names arereturned in RFC1035 format, i.e. all non letter, digit,
       hyphen characters are represented as \DDD. Besides, all domain names are expanded to fully
       qualified domain names, with trailing dot.  This is in contrast to accessor methods of
       individual data elements in RR objects, like name, which will not return the trailing dot.

   rdatastr
           $s = $rr->rdatastr;

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

   name
           $name = $rr->name;

       Returns the record's domain name.

   type
           $type = $rr->type;

       Returns the record's type.

   class
           $class = $rr->class;

       Returns the record's class.

   ttl
           $ttl = $rr->ttl;

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

   rdlength
           $rdlength = $rr->rdlength;

       Returns the length of the record's data section.

   rdata
           $rdata = $rr->rdata

       Returns the record's data section as binary data.

Sorting of RR arrays

       As of version 0.55 there is functionality to help you sort RR arrays. The sorting is done
       by Net::DNS::rrsort(), see the Net::DNS documentation. This package provides class methods
       to set the sorting functions used for a particular RR based on a particular attribute.

   set_rrsort_func
       Net::DNS::RR::SRV->set_rrsort_func("priority",                       sub {
                              my ($a,$b)=($Net::DNS::a,$Net::DNS::b);
       $a->priority <=> $b->priority                        ||                        $b->weight
       <=> $a->weight
                            }

       Net::DNS::RR::SRV->set_rrsort_func("default_sort",                       sub {
                              my ($a,$b)=($Net::DNS::a,$Net::DNS::b);
       $a->priority <=> $b->priority                        ||                        $b->weight
       <=> $a->weight
                            }

       set_rrsort_func needs to be called as a class method. The first argument is the attribute
       name on which the sorting will need to take place. If you specify "default_sort" than that
       is the sort algorithm that will be used in the case that rrsort() is called without an RR
       attribute as argument.

       The second argument is a reference to a function that uses the variables $a and $b global
       to the "from Net::DNS"(!!)package for the sorting. During the sorting $a and $b will
       contain references to objects from the class you called the set_prop_sort from. In other
       words, you can rest assured that the above sorting function will only get
       Net::DNS::RR::SRV objects.

       The above example is the sorting function that actually is implemented in SRV.

BUGS

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

COPYRIGHT

       Copyright (c)1997-2002 Michael Fuhr.

       Portions Copyright (c)2002-2004 Chris Reinhardt.

       Portions Copyright (c)2005-2007 Olaf Kolkman

       Portions Copyright (c)2007 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.

       EDNS0 extensions by Olaf Kolkman.

SEE ALSO

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