Net::DNS::Resolver::Recurse (3)

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NAME

Net::DNS::Resolver::Recurse - DNS recursive resolver

SYNOPSIS

    use Net::DNS::Resolver::Recurse;

    $resolver = new Net::DNS::Resolver::Recurse();

    $packet = $resolver->query ( 'www.example.com', 'A' );
    $packet = $resolver->search( 'www.example.com', 'A' );
    $packet = $resolver->send  ( 'www.example.com', 'A' );

DESCRIPTION

This module is a subclass of Net::DNS::Resolver.

METHODS

This module inherits almost all the methods from Net::DNS::Resolver. Additional module-specific methods are described below.

hints

This method specifies a list of the addresses used to locate the authoritative name servers for the root (.) zone.

    $resolver->hints(@ip);

If no hints are passed, the default nameserver is used to discover the addresses of the root nameservers.

If the default nameserver not been configured correctly, or at all, a built-in list of

addresses is used.

query, search, send

The query(), search() and send() methods produce the same result as their counterparts in Net::DNS::Resolver.

    $packet = $resolver->send( 'www.example.com.', 'A' );

Server-side recursion is suppressed by clearing the recurse flag in the packet and recursive name resolution is performed explicitly.

The query() and search() methods are inherited from Net::DNS::Resolver and invoke send() indirectly.

callback

This method specifies a code reference to a subroutine, which is then invoked at each stage of the recursive lookup.

For example to emulate dig's "+trace" function:

    my $coderef = sub {
        my $packet = shift;

        $_->print for $packet->additional;

        printf ";; Received %d bytes from %s\n\n",
                $packet->answersize, $packet->answerfrom;
    };

    $resolver->callback($coderef);

The callback subroutine is not called for queries for missing glue records.

ACKNOWLEDGEMENT

This package is an improved and compatible reimplementation of the Net::DNS::Resolver::Recurse.pm created by Rob Brown in 2002.

The contribution of Rob Brown is gratefully acknowledged.

COPYRIGHT

Copyright (c)2014 Dick Franks

Portions Copyright (c)2002 Rob Brown

All rights reserved.

This program is free software; you may redistribute it and/or modify it under the same terms as Perl itself.

SEE ALSO

Net::DNS::Resolver