Net::DNS::RR::NSEC3(3pm)

1RR::NSEC3(3)          User Contributed Perl Documentation         RR::NSEC3(3)
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NAME

6       Net::DNS::RR::NSEC3 - DNS NSEC3 resource record
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SYNOPSIS

9       "use Net::DNS::RR;"
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DESCRIPTION

12       Class for DNS Address (NSEC3) resource records.
13
14       The NSEC3 Resource Record (RR) provides authenticated denial of
15       existence for DNS Resource Record Sets.  The NSEC3 RR lists RR types
16       present at the NSEC3 RR's original ownername.  It includes the next
17       hashed ownername in the hash order of the zone.  The complete set of
18       NSEC3 RRs in a zone indicates which RRsets exist for the original
19       ownername of the RRset and form a chain of hashed ownernames in the
20       zone.
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METHODS

23   ownername
24       Returns the hashed value of the original owner name as contained in the
25       first label of the ownername of the record.
26
27          The owner name for the NSEC3 RR is the base32 encoding of the hashed
28          owner name prepended as a single label to the name of the zone.
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30       In other words the name(name) method returns the result of the
31       ownername() method prepended to the name of the containing zone.
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33   optout
34       Reads and sets the opt-out attribute.
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36   flags
37       Reads and sets the flag field.
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39   hashalgo
40       Reads and sets the hashalgo (hash algorithm) attribute.
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42   hnxtname
43       Reads and sets the hnxtname (hashed next ownername) attribute.
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45   typelist  (inhereted from NSEC)
46           print "typelist" = ", $rr->typelist, "\n";
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48       Returns a string with the list of qtypes for which data exists for this
49       particular label.
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51   typebm  (inhereted from NSEC)
52           print "typebm" = " unpack("B*", $rr->typebm), "\n";
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54       Same as the typelist but now in a representation  bitmap as in
55       specified in the RFC. This is not the kind of method you will need on
56       daily basis.
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58   covered, matched
59           print "covered" if $rr->covered{'example.foo'}
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61       covered returns a nonzero value when the the domain name provided as
62       argument is covered as defined in the NSEC3 specification:
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64          To cover:  An NSEC3 RR is said to "cover" a name if the hash of the
65             name or "next closer" name falls between the owner name and the
66             next hashed owner name of the NSEC3.  In other words, if it proves
67             the nonexistence of the name, either directly or by proving the
68             nonexistence of an ancestor of the name.
69
70       Similarly ismatched returns a nonzero value when the domainname in the
71       argument matches as defined in the NSEC3 specification:
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73          To match: An NSEC3 RR is said to "match" a name if the owner name
74             of the NSEC3 RR is the same as the hashed owner name of that
75             name.
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Functions

78   name2hash
79       Takes the hash identifyer (numeric), a fullyqualfied domain name, the
80       number of iterations and a binary salt to compute the hash value used
81       in the NSEC3 calculations.
82
83           $hashalg=Net::DNS::SEC->digtype("SHA1");
84           $salt=pack("H*","aabbccdd");
85           $iterations=12;
86           $name="*.x.w.example";
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88           $hashedname= Net::DNS::RR::NSEC3::name2hash($hashalg,$name,$iterations,$salt);
89           print $hashedname;
90       results in:
91           92pqneegtaue7pjatc3l3qnk738c6v5m
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93       Normally the salt and itterations would be fetched from an NSEC3PARAM
94       record.
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COPYRIGHT

97       Copyright (c) 2007, 2008  NLnet Labs.  Author Olaf M. Kolkman
98       <olaf@net-dns.org>
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100       All Rights Reserved
101
102       Permission to use, copy, modify, and distribute this software and its
103       documentation for any purpose and without fee is hereby granted,
104       provided that the above copyright notice appear in all copies and that
105       both that copyright notice and this permission notice appear in
106       supporting documentation, and that the name of the author not be used
107       in advertising or publicity pertaining to distribution of the software
108       without specific, written prior permission.
109
110       THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
111       INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS; IN NO
112       EVENT SHALL AUTHOR BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL
113       DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
114       PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
115       ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF
116       THIS SOFTWARE.
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118       Based on, and contains, code by Copyright (c) 1997 Michael Fuhr.
119
120       Acknowledgements to Roy Arends who made a test version for this class
121       and whose code I've looked at before writing this module.
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NAME

SYNOPSIS

DESCRIPTION

METHODS

Functions

COPYRIGHT

SEE ALSO