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       1                 :            : // Copyright (C) 2010  Internet Systems Consortium, Inc. ("ISC")
       2                 :            : //
       3                 :            : // Permission to use, copy, modify, and/or distribute this software for any
       4                 :            : // purpose with or without fee is hereby granted, provided that the above
       5                 :            : // copyright notice and this permission notice appear in all copies.
       6                 :            : //
       7                 :            : // THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
       8                 :            : // REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
       9                 :            : // AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
      10                 :            : // INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
      11                 :            : // LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
      12                 :            : // OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
      13                 :            : // PERFORMANCE OF THIS SOFTWARE.
      14                 :            : 
      15                 :            : #include <iostream>
      16                 :            : #include <string>
      17                 :            : 
      18                 :            : #include <util/buffer.h>
      19                 :            : #include <dns/messagerenderer.h>
      20                 :            : #include <dns/name.h>
      21                 :            : #include <dns/question.h>
      22                 :            : #include <dns/rrclass.h>
      23                 :            : #include <dns/rrtype.h>
      24                 :            : 
      25                 :            : using namespace std;
      26                 :            : using namespace isc::util;
      27                 :            : 
      28                 :            : namespace isc {
      29                 :            : namespace dns {
      30                 :          8 : Question::Question(InputBuffer& buffer) :
      31                 :          8 :     name_(buffer), rrtype_(0), rrclass_(0)
      32                 :            : {
      33                 :            :     // In theory, we could perform this in the member initialization list,
      34                 :            :     // and it would be a little bit more efficient.  We don't do this, however,
      35                 :            :     // because the initialization ordering is crucial (type must be first)
      36                 :            :     // and the ordering in the initialization list depends on the appearance
      37                 :            :     // order of member variables.  It's fragile to rely on such an implicit
      38                 :            :     // dependency, so we make the initialization order explicit.
      39         [ +  - ]:          6 :     rrtype_ = RRType(buffer);
      40         [ +  + ]:          6 :     rrclass_ = RRClass(buffer);
      41                 :          4 : }
      42                 :            : 
      43                 :            : string
      44                 :        559 : Question::toText() const {
      45                 :        559 :     return (name_.toText() + " " + rrclass_.toText() + " " +
      46 [ +  - ][ +  - ]:       1118 :             rrtype_.toText() + "\n");
         [ +  - ][ +  - ]
         [ +  - ][ +  - ]
                 [ +  - ]
      47                 :            : }
      48                 :            : 
      49                 :            : unsigned int
      50                 :          4 : Question::toWire(OutputBuffer& buffer) const {
      51                 :          4 :     name_.toWire(buffer);
      52                 :          4 :     rrtype_.toWire(buffer);
      53                 :          4 :     rrclass_.toWire(buffer);    // number of "entries", which is always 1
      54                 :            : 
      55                 :          4 :     return (1);
      56                 :            : }
      57                 :            : 
      58                 :            : unsigned int
      59                 :        913 : Question::toWire(AbstractMessageRenderer& renderer) const {
      60                 :        913 :     const size_t pos0 = renderer.getLength();
      61                 :            : 
      62                 :        913 :     renderer.writeName(name_);
      63                 :        913 :     rrtype_.toWire(renderer);
      64                 :        913 :     rrclass_.toWire(renderer);
      65                 :            : 
      66                 :            :     // Make sure the renderer has a room for the question
      67         [ +  + ]:        913 :     if (renderer.getLength() > renderer.getLengthLimit()) {
      68                 :          6 :         renderer.trim(renderer.getLength() - pos0);
      69                 :          6 :         renderer.setTruncated();
      70                 :        913 :         return (0);
      71                 :            :     }
      72                 :            : 
      73                 :            :     return (1);                 // number of "entries"
      74                 :            : }
      75                 :            : 
      76                 :            : ostream&
      77                 :          1 : operator<<(std::ostream& os, const Question& question) {
      78         [ +  - ]:          1 :     os << question.toText();
      79                 :          1 :     return (os);
      80                 :            : }
      81                 :            : }
      82                 :        137 : }