Страницы справочника OS X

Эта страница руководства для  версии 10.9 Mac OS X

Читать страницы руководства

Net::DNS::Resolver::Recurse(3)       User Contributed Perl Documentation      Net::DNS::Resolver::Recurse(3)



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 932 2011-10-26 12:40:48Z willem $



perl v5.16.2                                     2012-01-27                   Net::DNS::Resolver::Recurse(3)