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.\" ========================================================================
.\"
.IX Title "Net::DNS::Resolver::Recurse 3"
.TH Net::DNS::Resolver::Recurse 3 "2016-05-27" "perl v5.16.3" "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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.nh
.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 of nameservers to
be used to discover the addresses of the root nameservers.
.PP
.Vb 1
\&    $resolver\->hints(@ip);
.Ve
.PP
If no hints are passed, the priming query is directed to nameservers
drawn from a built-in list of \s-1IP\s0 addresses.
.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
query packets 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;
\&
\&        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,
whose contribution is gratefully acknowledged.
.SH "COPYRIGHT"
.IX Header "COPYRIGHT"
Copyright (c)2014 Dick Franks.
.PP
Portions Copyright (c)2002 Rob Brown.
.PP
All rights reserved.
.SH "LICENSE"
.IX Header "LICENSE"
Permission to use, copy, modify, and distribute this software and its
documentation for any purpose and without fee is hereby granted, provided
that the above copyright notice appear in all copies and that both that
copyright notice and this permission notice appear in supporting
documentation, and that the name of the author not be used in advertising
or publicity pertaining to distribution of the software without specific
prior written permission.
.PP
\&\s-1THE SOFTWARE IS PROVIDED \*(L"AS IS\*(R", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
DEALINGS IN THE SOFTWARE.\s0
.SH "SEE ALSO"
.IX Header "SEE ALSO"
Net::DNS::Resolver