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 $