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Net::DNS::RR - DNS Resource Record class
use Net::DNS::RR
Net::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 Net::DNS::RR
will return undef
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 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.
$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.
$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 = $rr->rdata
Returns the record's data section as binary data.
As of version 0.55 there is functionality to help you sort RR arrays. The sorting is done by Net::DNS::rrsort(), see the the Net::DNS manpage documentation. This package provides class methods to set the sorting functions used for a particular RR based on a particular attribute.
Net::DNS::RR::SRV->set_rrsort_func(``priority'', sub { my ($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.
This version of Net::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), the Net::DNS manpage, the Net::DNS::Resolver manpage, the Net::DNS::Packet manpage, the Net::DNS::Update manpage, the Net::DNS::Header manpage, the Net::DNS::Question manpage, RFC 1035 Section 4.1.3