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Manual Reference Pages  -  NET::DNS::TOOLKIT::RR::NS (3)

.ds Aq ’

NAME

Net::DNS::ToolKit::RR::NS - Resource Record Handler

CONTENTS

SYNOPSIS



  DO NOT use Net::DNS::ToolKit::RR::NS
  DO NOT require Net::DNS::ToolKit::RR::NS

  Net::DNS::ToolKit::RR::NS is autoloaded by
  class Net::DNS::ToolKit::RR and its methods
  are instantiated in a special manner.

  use Net::DNS::ToolKit::RR;
  ($get,$put,$parse) = new Net::DNS::ToolKit::RR;

  ($newoff,$name,$type,$class,$ttl,$rdlength,
        $nsdname) = $get->NS(\$buffer,$offset);

  Note: the $get->NS method is normally called
  via:  @stuff = $get->next(\$buffer,$offset);

  ($newoff,@dnptrs)=$put->NS(\$buffer,$offset,\@dnptrs,
        $name,$type,$class,$ttl,$nsdname);

  $NAME,$TYPE,$CLASS,$TTL,$rdlength,$NSDNAME)
    = $parse->NS($name,$type,$class,$ttl,$rdlength,
        $nsdname);



DESCRIPTION

<B>Net::DNS::ToolKit::RR:NSB> appends an NS resource record to a DNS packet under construction, recovers an NS resource record from a packet being decoded, and converts the numeric/binary portions of the resource record to human readable form.



  Description from RFC1035.txt

  3.2.1. Format

  All RRs have the same top level format shown below:

                                    1  1  1  1  1  1
      0  1  2  3  4  5  6  7  8  9  0  1  2  3  4  5
    +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
    |                      NAME                     |
    +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
    |                      TYPE                     |
    +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
    |                     CLASS                     |
    +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
    |                      TTL                      |
    +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
    |                   RDLENGTH                    |
    +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--|
    |                     RDATA                     |
    +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+

  NAME  an owner name, i.e., the name of the node to which this
        resource record pertains.

  TYPE  two octets containing one of the RR TYPE codes.

  CLASS two octets containing one of the RR CLASS codes.

  TTL   a 32 bit signed integer that specifies the time interval
        that the resource record may be cached before the source
        of the information should again be consulted.  Zero
        values are interpreted to mean that the RR can only be
        used for the transaction in progress, and should not be
        cached.  For example, SOA records are always distributed
        with a zero TTL to prohibit caching.  Zero values can
        also be used for extremely volatile data.

  RDLENGTH an unsigned 16 bit integer that specifies the length
        in octets of the RDATA field.

  RDATA a variable length string of octets that describes the
        resource.  The format of this information varies
        according to the TYPE and CLASS of the resource record.

  3.3.11. NS RDATA format

    +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
    /                   NSDNAME                     /
    /                                               /
    +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+

  where:

  NSDNAME A <domain-name> which specifies a host which should be
        authoritative for the specified class and domain.



NS records cause both the usual additional section processing to locate a type A record, and, when used in a referral, a special search of the zone in which they reside for glue information.

The NS RR states that the named host should be expected to have a zone starting at owner name of the specified class. Note that the class may not indicate the protocol family which should be used to communicate with the host, although it is typically a strong hint. For example, hosts which are name servers for either Internet (IN) or Hesiod (HS) class information are normally queried using IN class protocols.
o @stuff = $get->NS(\$buffer,$offset);



  Get the contents of the resource record.

  USE: @stuff = $get->next(\$buffer,$offset);

  where: @stuff = (
  $newoff $name,$type,$class,$ttl,$rdlength,
  $nsdname );



All except the last item, <B>B>$nsdname<B>B>, is provided by the class loader, <B>Net::DNS::ToolKit::RRB>. The code in this method knows how to retrieve <B>B>$nsdname<B>B>.



  input:        pointer to buffer,
                offset into buffer
  returns:      offset to next resource,
                @common RR elements,
                NS Domain Name



o ($newoff,@dnptrs)=$put->NS(\$buffer,$offset,\@dnptrs,
        $name,$type,$class,$ttl,$nsdname);

Append an NS record to $buffer.



  where @common = (
        $name,$type,$class,$ttl);



The method will insert the $rdlength and $nsdname, then pass through the updated pointer to the array of compressed names

The class loader, <B>Net::DNS::ToolKit::RRB>, inserts the @common elements and returns updated @dnptrs. This module knows how to insert its RDATA and calculate the $rdlength.



  input:        pointer to buffer,
                offset (normally end of buffer),
                pointer to compressed name array,
                @common RR elements,
                NS Domain Name
  output:       offset to next RR,
                new compressed name pointer array,
           or   empty list () on error.



o (@COMMON,$NSDNAME) = $parse->NS(@common,$nsdname);

Converts binary/numeric field data into human readable form. The common RR elements are supplied by the class loader, <B>Net::DNS::ToolKit::RRB>. For NS RR’s, this returns $nsdname terminated with ’.’



  input:        NS Domain Name
  returns:      NS Domain Name.



DEPENDENCIES



        Net::DNS::ToolKit
        Net::DNS::Codes



EXPORT



        none



AUTHOR

Michael Robinton <michael@bizsystems.com>

COPYRIGHT



    Copyright 2003 - 2011, Michael Robinton <michael@bizsystems.com>



Michael Robinton <michael@bizsystems.com>

All rights reserved.

This program is free software; you can redistribute it and/or modify it under the terms of either:



  a) the GNU General Public License as published by the Free
  Software Foundation; either version 2, or (at your option) any
  later version, or

  b) the "Artistic License" which comes with this distribution.



This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See either the GNU General Public License or the Artistic License for more details.

You should have received a copy of the Artistic License with this distribution, in the file named Artistic. If not, I’ll be glad to provide one.

You should also have received a copy of the GNU General Public License along with this program in the file named Copying. If not, write to the



        Free Software Foundation, Inc.                       
        59 Temple Place, Suite 330
        Boston, MA  02111-1307, USA



or visit their web page on the internet at:



        http://www.gnu.org/copyleft/gpl.html.



See also:

Net::DNS::Codes(3), Net::DNS::ToolKit(3)
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