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net::dns::resolver::recurse(3) [mojave man page]

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

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: 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 ", $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( "", "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, 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: 1096 2012-12-28 13:35:15Z willem $ perl v5.18.2 2014-01-16 Net::DNS::Resolver::Recurse(3)

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Mail::DKIM::DNS(3)					User Contributed Perl Documentation					Mail::DKIM::DNS(3)

Mail::DKIM::DNS - performs DNS queries for Mail::DKIM DESCRIPTION
This is the module that performs DNS queries for Mail::DKIM. CONFIGURATION
This module has a couple configuration settings that the caller may want to use to customize the behavior of this module. $Mail::DKIM::DNS::TIMEOUT This global variable specifies the maximum amount of time (in seconds) to wait for a single DNS query to complete. The default is 10. Mail::DKIM::DNS::resolver() Use this global subroutine to get or replace the instance of Net::DNS::Resolver that Mail::DKIM uses. If set to undef (the default), then a brand new default instance of Net::DNS::Resolver will be created the first time a DNS query is needed. You will call this subroutine if you want to specify non-default options to Net::DNS::Resolver, such as different timeouts, or to enable use of a persistent socket. For example: # first, construct a custom DNS resolver my $res = Net::DNS::Resolver->new( udp_timeout => 3, tcp_timeout => 3, retry => 2, ); $res->udppacketsize(1240); $res->persistent_udp(1); # then, tell Mail::DKIM to use this resolver Mail::DKIM::DNS::resolver($res); Mail::DKIM::DNS::enable_EDNS0() This is a convenience subroutine that will construct an appropriate DNS resolver that uses EDNS0 (Extension mechanisms for DNS) to support large DNS replies, and configure Mail::DKIM to use it. (As such, it should NOT be used in conjunction with the resolver() subroutine described above.) Mail::DKIM::DNS::enable_EDNS0(); Use of EDNS0 is recommended, since it reduces the need for falling back to TCP when dealing with large DNS packets. However, it is not enabled by default because some Internet firewalls which do deep inspection of packets are not able to process EDNS0-enabled packets. When there is a firewall on a path to a DNS resolver, the EDNS0 feature should be specifically tested before enabling. AUTHOR
Copyright (C) 2006-2007, 2012-2013 by Messiah College This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself, either Perl version 5.8.6 or, at your option, any later version of Perl 5 you may have available. perl v5.18.2 2013-02-07 Mail::DKIM::DNS(3)
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