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.\" ========================================================================
.\"
.IX Title "Net::DNS::Resolver::Recurse 3"
.TH Net::DNS::Resolver::Recurse 3 "2015-02-26" "perl v5.20.0" "User Contributed Perl Documentation"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
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.SH "NAME"
Net::DNS::Resolver::Recurse \- DNS recursive resolver
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\&    use Net::DNS::Resolver::Recurse;
\&
\&    $resolver = new Net::DNS::Resolver::Recurse();
\&
\&    $packet = $resolver\->query ( \*(Aqwww.example.com\*(Aq, \*(AqA\*(Aq );
\&    $packet = $resolver\->search( \*(Aqwww.example.com\*(Aq, \*(AqA\*(Aq );
\&    $packet = $resolver\->send  ( \*(Aqwww.example.com\*(Aq, \*(AqA\*(Aq );
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
This module is a subclass of Net::DNS::Resolver.
.SH "METHODS"
.IX Header "METHODS"
This module inherits almost all the methods from Net::DNS::Resolver.
Additional module-specific methods are described below.
.SS "hints"
.IX Subsection "hints"
This method specifies a list of the \s-1IP\s0 addresses used to locate
the authoritative name servers for the root (.) zone.
.PP
.Vb 1
\&    $resolver\->hints(@ip);
.Ve
.PP
If no hints are passed, the default nameserver is used to discover
the addresses of the root nameservers.
.PP
If the default nameserver not been configured correctly,
or at all, a built-in list of \s-1IP\s0 addresses is used.
.SS "query, search, send"
.IX Subsection "query, search, send"
The \fIquery()\fR, \fIsearch()\fR and \fIsend()\fR methods produce the same result
as their counterparts in Net::DNS::Resolver.
.PP
.Vb 1
\&    $packet = $resolver\->send( \*(Aqwww.example.com.\*(Aq, \*(AqA\*(Aq );
.Ve
.PP
Server-side recursion is suppressed by clearing the recurse flag
in the packet and recursive name resolution is performed explicitly.
.PP
The \fIquery()\fR and \fIsearch()\fR methods are inherited from Net::DNS::Resolver
and invoke \fIsend()\fR indirectly.
.SS "callback"
.IX Subsection "callback"
This method specifies a code reference to a subroutine,
which is then invoked at each stage of the recursive lookup.
.PP
For example to emulate dig's \f(CW\*(C`+trace\*(C'\fR function:
.PP
.Vb 2
\&    my $coderef = sub {
\&        my $packet = shift;
\&
\&        $_\->print for $packet\->additional;
\&
\&        printf ";; Received %d bytes from %s\en\en",
\&                $packet\->answersize, $packet\->answerfrom;
\&    };
\&
\&    $resolver\->callback($coderef);
.Ve
.PP
The callback subroutine is not called
for queries for missing glue records.
.SH "ACKNOWLEDGEMENT"
.IX Header "ACKNOWLEDGEMENT"
This package is an improved and compatible reimplementation of the
Net::DNS::Resolver::Recurse.pm created by Rob Brown in 2002.
.PP
The contribution of Rob Brown is gratefully acknowledged.
.SH "COPYRIGHT"
.IX Header "COPYRIGHT"
Copyright (c)2014 Dick Franks
.PP
Portions Copyright (c)2002 Rob Brown
.PP
All rights reserved.
.PP
This program is free software; you may redistribute it and/or
modify it under the same terms as Perl itself.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
Net::DNS::Resolver