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

.ds Aq ’

NAME

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

CONTENTS

SYNOPSIS



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

  Net::DNS::ToolKit::RR::TXT 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,
        $textdata) = $get->TXT(\$buffer,$offset);

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

  ($newoff,@dnptrs)=$put->TXT(\$buffer,$offset,\@dnptrs,
        $name,$type,$class,$ttl,$textdata,$textdata,$textdata,...);

  $NAME,$TYPE,$CLASS,$TTL,$rdlength,$textdata)
    = $parse->TXT($name,$type,$class,$ttl,$rdlength,
        $textdata);



DESCRIPTION

<B>Net::DNS::ToolKit::RR:TXTB> appends an TXT resource record to a DNS packet under construction, recovers an TXT 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.

    3.3.14. TXT RDATA format

    +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
    /                   TXT-DATA                    /
    +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+

    where:

    TXT-DATA One or more <character-string>s.



TXT RRs are used to hold descriptive text. The semantics of the text depends on the domain where it is found.

Note: Each character string consists of up to 255 characters.
o @stuff = $get->TXT(\$buffer,$offset);



  Get the contents of the resource record.

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

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



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



  input:        pointer to buffer,
                offset into buffer
  returns:      offset to next resource,
                @common RR elements,
                text string(s)



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

Append a TXT record to $buffer.



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



The method will insert the $rdlength and $textdata, 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,
                text string(s) =< 255 characters.
  output:       offset to next RR,
                new compressed name pointer array,
           or   empty list () on error.

  Note: Double quotes embedded in the text
        should be escaped. i.e. \"



o (@COMMON,@textdata) = $parse->TXT(@common,@textdata);

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 TXT RR’s, this returns the text strings, each surrounded by double quotes.



  input:        text string(s)
  returns:      "text string(s)"



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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perl v5.20.3 NET::DNS::TOOLKIT::RR::TXT (3) 2013-04-21

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