net::dns::resolver::recurse(3opnmt)
NAME
Net::DNS::Resolver::Recurse - Perform recursive dns lookups
SYNOPSIS
use Net::DNS::Resolver::Recurse; my $res = Net::DNS::Resolver::Recurse->new;
DESCRIPTION
- This module is a sub class of Net::DNS::Resolver. So the methods for
Net::DNS::Resolver still work for this module as well. There are just a couple methods added: - hints
- Initialize the hint servers. Recursive queries need a starting name
server to work off of. This method takes a list of IP addresses to use as the starting servers. These name servers should be authoritative
for the root (.) zone.
$res->hints(@ips); - If no hints are passed, the default nameserver is asked for the hints.
Normally these IPs can be obtained from the following location:
ftp://ftp.internic.net/domain/named.root - recursion_callback
- This method is takes a code reference, which is then invoked each time
a packet is received during the recursive lookup. For example to
emulate dig's "+trace" function:
$res->recursion_callback(sub {my $packet = shift;$_->print for $packet->additional;printf(";; Received %d bytes from %s\n\n",$packet->answersize,
$packet->answerfrom);}); - query_dorecursion
- This method is much like the normal query() method except it disables
the recurse flag in the packet and explicitly performs the recursion.
$packet = $res->query_dorecursion( "www.netscape.com.", "A");
IPv6 transport
If the appropriate IPv6 libraries are installed the recursive resolver
will randomly choose between IPv6 and IPv4 addresses of the nameservers
it encounters during recursion.
If you want to force IPv4 transport use the force_v4() method. Also see
the IPv6 transport notes in the Net::DNS::Resolver documentation.
AUTHOR
Rob Brown, bbb@cpan.org
SEE ALSO
Net::DNS::Resolver,
COPYRIGHT
Copyright (c) 2002, Rob Brown. All rights reserved. Portions
Copyright (c) 2005, Olaf M Kolkman.
This module is free software; you can redistribute it and/or modify it
under the same terms as Perl itself.
- $Id: Recurse.pm 740 2008-12-17 23:20:53Z olaf $