Skip site navigation (1)Skip section navigation (2)

FreeBSD Manual Pages


home | help
Net::DNS::ToolKit::RR:User3Contributed Perl DocumeNet::DNS::ToolKit::RR::RP(3)

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

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

	 Net::DNS::ToolKit::RR::RP 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;

	       $rname,$tname) =	$get->RP(\$buffer,$offset);

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


	   = $parse->XYZ($name,$type,$class,$ttl,$rdlength,

       Net::DNS::ToolKit::RR:RP	appends	an RP resource record to a DNS packet
       under construction, recovers an RP 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 and RFC1183.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.

	 RFC1183 2.2. The Responsible Person RR
					   1  1	 1  1  1  1
	     0	1  2  3	 4  5  6  7  8	9  0  1	 2  3  4  5
	   |			 RNAME			   |
	   |			 TNAME			   |

	  Both RDATA fields are	required in all	RP RRs.

	  The first field, RNAME, is a domain name that	specifies the
	  mailbox for the responsible person.  Its format in master files uses
	  the DNS convention for mailbox encoding, identical to	that used for
	  the RNAME mailbox field in the SOA RR.  The root domain name (just
	  ".") may be specified	for <mbox-dname> to indicate that no mailbox is

	  The second field, TNAME, is a	domain name for	which TXT RR's
	  exist.  A subsequent query can be performed to retrieve the
	  associated TXT resource records at <txt-dname>.  This	provides a
	  level	of indirection so that the entity can be referred to from
	  multiple places in the DNS.  The root	domain name (just ".") may be
	  specified for	<txt-dname> to indicate	that the TXT_DNAME is absent,
	  and no associated TXT	RR exists.

	  The format of	the RP RR is class insensitive.	 RP records cause no
	  additional section processing.

       o   @stuff = $get->RP(\$buffer,$offset);

	     Get the contents of the resource record.

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

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

	   All except the last item, $cname, is	provided by the	class loader,
	   Net::DNS::ToolKit::RR. The code in this method knows	how to
	   retrieve $cname.

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

       o   ($newoff,@dnptrs)=$put->RP(\$buffer,$offset,\@dnptrs,

	   Append an RP	record to $buffer.

	     where @common = (

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

	   The class loader, Net::DNS::ToolKit::RR, 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,
	     output:	   offset to next RR,
			   new compressed name pointer array,
		      or   empty list () on error.

       o   (@COMMON,$RP) = $parse->RP(@common,$rname,$tname);

	   Converts binary/numeric field data into human readable form.	The
	   common RR elements are supplied by the class	loader,
	   Net::DNS::ToolKit::RR.  For RP RR's,	this returns the $cname
	   terminated with '.'




       Michael Robinton	<>

	   Copyright 2003 - 2011, Michael Robinton <>

       Michael Robinton	<>

       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
       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

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

       or visit	their web page on the internet at:

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

perl v5.32.0			  2011-11-05	  Net::DNS::ToolKit::RR::RP(3)


Want to link to this manual page? Use this URL:

home | help