Michael Robinton > Net-DNS-ToolKit-0.48 > Net::DNS::ToolKit::RR::SOA

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NAME ^

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

SYNOPSIS ^

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

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

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

  ($newoff,@dnptrs)=$put->SOA(\$buffer,$offset,\@dnptrs,
     $name,$type,$class,$ttl,
     $mname,$rname,$serial,$refresh,$retry,$expire,$min);

  $NAME,$TYPE,$CLASS,$TTL,$rdlength,
  $MNAME,$RNAME,$serial,$refresh,$retry,$expire,$min) 
    = $parse->SOA($name,$type,$class,$ttl,$rdlength,
      $mname,$rname,$serial,$refresh,$retry,$expire,$min);

DESCRIPTION ^

Net::DNS::ToolKit::RR:SOA appends an SOA resource record to a DNS packet under construction, recovers an SOA 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.

    3.3.13. SOA RDATA format

    +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
    /                     MNAME                     /
    /                                               /
    +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
    /                     RNAME                     /
    +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
    |                    SERIAL                     |
    |                                               |
    +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
    |                    REFRESH                    |
    |                                               |
    +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
    |                     RETRY                     |
    |                                               |
    +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
    |                    EXPIRE                     |
    |                                               |
    +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
    |                    MINIMUM                    |
    |                                               |
    +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+

    where:

    MNAME The <domain-name> of the name server that was
        the original or primary source of data for this 
        zone.

    RNAME A <domain-name> which specifies the mailbox of
        the person responsible for this zone.

    SERIAL The unsigned 32 bit version number of the 
        original copy of the zone.  Zone transfers 
        preserve this value.  This value wraps and 
        should be compared using sequence space 
        arithmetic.

    REFRESH A 32 bit time interval before the zone 
        should be refreshed.

    RETRY A 32 bit time interval that should elapse 
        before a failed refresh should be retried.

    EXPIRE A 32 bit time value that specifies the upper 
        limit on the time interval that can elapse 
        before the zone is no longer authoritative.

    MINIMUM The unsigned 32 bit minimum TTL field that
        should be exported with any RR from this zone.

SOA records cause no additional section processing.

All times are in units of seconds.

Most of these fields are pertinent only for name server maintenance operations. However, MINIMUM is used in all query operations that retrieve RRs from a zone. Whenever a RR is sent in a response to a query, the TTL field is set to the maximum of the TTL field from the RR and the MINIMUM field in the appropriate SOA. Thus MINIMUM is a lower bound on the TTL field for all RRs in a zone. Note that this use of MINIMUM should occur when the RRs are copied into the response and not when the zone is loaded from a master file or via a zone transfer. The reason for this provison is to allow future dynamic update facilities to change the SOA RR with known semantics.

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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