RR::NSEC3(3)

NAME
Net::DNS::RR::NSEC3 - DNS NSEC3 resource record

SYNOPSIS
    use Net::DNS;
    $rr = new Net::DNS::RR('name NSEC3 algorithm flags iterations salt hnxtname');

DESCRIPTION
Class for DNSSEC NSEC3 resource records.

The NSEC3 Resource Record (RR) provides authenticated denial of existence for DNS Resource Record Sets.

The NSEC3 RR lists RR types present at the original owner name of the NSEC3 RR. It includes the next hashed owner name in the hash order of the zone. The complete set of NSEC3 RRs in a zone indicates which RRSets exist for the original owner name of the RR and form a chain of hashed owner names in the zone.

METHODS
The available methods are those inherited from the base class augmented by the type-specific methods defined in this package.

Use of undocumented package features or direct access to internal data structures is discouraged and could result in program termination or other unpredictable behaviour.

  algorithm
    $algorithm = $rr->algorithm;
    $rr->algorithm( $algorithm );

The Hash Algorithm field is represented as an unsigned decimal integer. The value has a maximum of 255.

algorithm() may also be invoked as a class method or simple function to perform mnemonic and numeric code translation.

  flags
    $flags = $rr->flags;
    $rr->flags( $flags );

The Flags field is represented as an unsigned decimal integer. The value has a maximum value of 255.

  iterations
    $iterations = $rr->iterations;
    $rr->iterations( $iterations );

The Iterations field is represented as an unsigned decimal integer. The value is between 0 and 65535, inclusive.

  salt
    $salt = $rr->salt;
    $rr->salt( $salt );

The Salt field is represented as a contiguous sequence of hexadecimal digits. A "-" (unquoted) is used in string format to indicate that the salt field is absent.

  saltbin
    $saltbin = $rr->saltbin;
    $rr->saltbin( $saltbin );

The Salt field as a sequence of octets.

  hnxtname
    $hnxtname = $rr->hnxtname;
    $rr->hnxtname( $hnxtname );

The Next Hashed Owner Name field points to the next node that has authoritative data or contains a delegation point NS RRset.

  typelist
    @typelist = $rr->typelist;
    $typelist = $rr->typelist;
    $rr->typelist( @typelist );

The Type List identifies the RRset types that exist at the NSEC RR owner name. When called in scalar context, the list is interpolated into a string.

  covered, matched
    print "covered" if $rr->covered{'example.foo'}

covered() returns a nonzero value when the the domain name provided as argument is covered as defined in the NSEC3 specification:

   To cover:  An NSEC3 RR is said to "cover" a name if the hash of the
      name or "next closer" name falls between the owner name and the
      next hashed owner name of the NSEC3.  In other words, if it proves
      the nonexistence of the name, either directly or by proving the
      nonexistence of an ancestor of the name.

Similarly matched() returns a nonzero value when the domainname in the argument matches as defined in the NSEC3 specification:

   To match: An NSEC3 RR is said to "match" a name if the owner name
      of the NSEC3 RR is the same as the hashed owner name of that
      name.

  optout
    $rr->optout(0);
    $rr->optout(1);

    if ( $rr->optout ) {
        ...
    }

Boolean Opt Out flag.

COPYRIGHT
Copyright (c)2007,2008 NLnet Labs. Author Olaf M. Kolkman

All Rights Reserved

Permission to use, copy, modify, and distribute this software and its documentation for any purpose and without fee is hereby granted, provided that the above copyright notice appear in all copies and that both that copyright notice and this permission notice appear in supporting documentation, and that the name of the author not be used in advertising or publicity pertaining to distribution of the software without specific prior written permission.

THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS; IN NO EVENT SHALL AUTHOR BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

Package template (c)2009,2012 O.M.Kolkman and R.W.Franks.

SEE ALSO
perl, Net::DNS, Net::DNS::RR, RFC5155

Hash Algorithms <http://www.iana.org/assignments/dnssec-nsec3-parameters>