BIND 10 #550: wildcard handling for memory zone: load

[BIND 10 Development]

#550: wildcard handling for memory zone: load
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           Reporter:  jinmei         |                      Owner:
               Type:  enhancement    |                     Status:  new
           Priority:  major          |                  Milestone:  A-Team-
          Component:  data source    |  Task-Backlog
          Sensitive:  0              |                   Keywords:
Add Hours to Ticket:  0              |  Estimated Number of Hours:  0
        Total Hours:  0              |                  Billable?:  1
                                     |                  Internal?:  0
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 See the analysis ticket (#506) for the big picture.

 This is a substask for the loading part:

 The basic idea is to mark the parent node of a wildcard name
 (e.g. example.com for *.example.com) in order to force the find()
 logic to perform special processing if the best match node indicates
 the existence of a wildcard node below it.
 This proces is two-fold:

  - when loading an RRset, if the owner name is a wildcard
    (e.g. *.foo.example.com) and the RR type is !NS && !NSEC3, mark
    that node as "wild". Also make sure the parent node exists in the
    tree by explicitly inserting it.
  - for any owner name, check if any of its ancestor is a wildcard. this
   is the case, e.g., when adding "foo.*.example.com", which would
   result in an empty non terminal wildcard node for name
   "*.example.com". Note: adding such a name as "foo.*.example.com" is
   almost bogus, and BIND 9 rejects loading them by default. It's
   still not prohibited by the protocol spec, however. If an ancestor
   name is a wildcard, explicitly add a rbt node for that name (to
   make sure if can find it as an exact match by find()), and treat
   its parent as described in the first bullet.

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Ticket URL: <https://bind10.isc.org/ticket/550>
BIND 10 Development <http://bind10.isc.org>
BIND 10 Development