BIND 10 #2059: ZoneFinder::Context::getSynthesizedCNAME

[BIND 10 Development]

#2059: ZoneFinder::Context::getSynthesizedCNAME
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            Reporter:  jinmei        |                        Owner:
                Type:  task          |                       Status:  new
            Priority:  medium        |                    Milestone:  Next-
           Component:  data source   |  Sprint-Proposed
           Sensitive:  0             |                     Keywords:
         Sub-Project:  DNS           |              Defect Severity:  N/A
Estimated Difficulty:  0             |  Feature Depending on Ticket:
         Total Hours:  0             |          Add Hours to Ticket:  0
                                     |                    Internal?:  0
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 See #2056 for background.  This is another one of such things,
 referring to trac1607exp branch:

 {{{#!cpp
     // Called for DNAME case.  (Somehow) construct the synthesized CNAME
     // for the qname with the DNAME.  Return Rcode of NOERROR() normally,
     // but YXDOMAIN() if CNAME cannot be constructed because the name
 would
     // be too long.
     //
     // Default version: extract the DNAME RDATA, construct the synthesized
     //   cname by splitting and concatinating labels, create a new
 standard
     //   CNAME RRset and sets its (only) RDATA to the created cname.
     // Optimized in-memory version: construct the synthesized cname
     //   essentially same way, but possibly more efficiently exploiting
 the
     //   internal representation of the in-memory RDATA (without involving
     //   expensive name splitting and concatinating).  To avoid resource
     //   allocation it might use some pool of "free (and empty)" internal
     //   RRset.
 }}}

 And in this ticket we'll only need to do the "default version".  It
 should be essentially straightforward refactoring.

-- 
Ticket URL: <http://bind10.isc.org/ticket/2059>
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