1Net::DNS::Resolver::RecUusresre(C3o)ntributed Perl DocumNeentt:a:tDiNoSn::Resolver::Recurse(3)
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NAME

6       Net::DNS::Resolver::Recurse - Perform recursive dns lookups
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SYNOPSIS

9         use Net::DNS::Resolver::Recurse;
10         my $res = Net::DNS::Resolver::Recurse->new;
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DESCRIPTION

13       This module is a sub class of Net::DNS::Resolver. So the methods for
14       Net::DNS::Resolver still work for this module as well.  There are just
15       a couple methods added:
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17       hints
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19       Initialize the hint servers.  Recursive queries need a starting name
20       server to work off of. This method takes a list of IP addresses to use
21       as the starting servers.  These name servers should be authoritative
22       for the root (.) zone.
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24         $res->hints(@ips);
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26       If no hints are passed, the default nameserver is asked for the hints.
27       Normally these IPs can be obtained from the following location:
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29         ftp://ftp.internic.net/domain/named.root
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31       recursion_callback
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33       This method is takes a code reference, which is then invoked each time
34       a packet is received during the recursive lookup.  For example to emu‐
35       late dig's "+trace" function:
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37        $res->recursion_callback(sub {
38            my $packet = shift;
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40            $_->print for $packet->additional;
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42            printf(";; Received %d bytes from %s\n\n",
43                $packet->answersize,
44                $packet->answerfrom
45            );
46        });
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48       query_dorecursion
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50       This method is much like the normal query() method except it disables
51       the recurse flag in the packet and explicitly performs the recursion.
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53         $packet = $res->query_dorecursion( "www.netscape.com.", "A");
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IPv6 transport

56       If the appropriate IPv6 libraries are installed the recursive resolver
57       will randomly choose between IPv6 and IPv4 addresses of the nameservers
58       it encounters during recursion.
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60       If you want to force IPv4 transport use the force_v4() method. Also see
61       the IPv6 transport notes in the Net::DNS::Resolver documentation.
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AUTHOR

64       Rob Brown, bbb@cpan.org
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SEE ALSO

67       Net::DNS::Resolver,
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70       Copyright (c) 2002, Rob Brown.  All rights reserved.  Portions Copy‐
71       right (c) 2005, Olaf M Kolkman.
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73       This module is free software; you can redistribute it and/or modify it
74       under the same terms as Perl itself.
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76       $Id: Recurse.pm 591 2006-05-22 21:32:38Z olaf $
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80perl v5.8.8                       2007-08-01    Net::DNS::Resolver::Recurse(3)
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