1 // Copyright (C) 2010-2015 Internet Systems Consortium, Inc. ("ISC")
2 //
3 // This Source Code Form is subject to the terms of the Mozilla Public
4 // License, v. 2.0. If a copy of the MPL was not distributed with this
5 // file, You can obtain one at http://mozilla.org/MPL/2.0/.
6
7 #include <config.h>
8
9 #include <iostream>
10 #include <string>
11
12 #include <util/buffer.h>
13 #include <dns/messagerenderer.h>
14 #include <dns/name.h>
15 #include <dns/question.h>
16 #include <dns/rrclass.h>
17 #include <dns/rrtype.h>
18
19 using namespace std;
20 using namespace isc::util;
21
22 namespace isc {
23 namespace dns {
Question(InputBuffer & buffer)24 Question::Question(InputBuffer& buffer) :
25 name_(buffer), rrtype_(0), rrclass_(0)
26 {
27 // In theory, we could perform this in the member initialization list,
28 // and it would be a little bit more efficient. We don't do this, however,
29 // because the initialization ordering is crucial (type must be first)
30 // and the ordering in the initialization list depends on the appearance
31 // order of member variables. It's fragile to rely on such an implicit
32 // dependency, so we make the initialization order explicit.
33 rrtype_ = RRType(buffer);
34 rrclass_ = RRClass(buffer);
35 }
36
37 std::string
toText(bool newline) const38 Question::toText(bool newline) const {
39 std::string r(name_.toText() + " " + rrclass_.toText() + " " +
40 rrtype_.toText());
41 if (newline) {
42 r.append("\n");
43 }
44
45 return (r);
46 }
47
48 unsigned int
toWire(OutputBuffer & buffer) const49 Question::toWire(OutputBuffer& buffer) const {
50 name_.toWire(buffer);
51 rrtype_.toWire(buffer);
52 rrclass_.toWire(buffer); // number of "entries", which is always 1
53
54 return (1);
55 }
56
57 unsigned int
toWire(AbstractMessageRenderer & renderer) const58 Question::toWire(AbstractMessageRenderer& renderer) const {
59 const size_t pos0 = renderer.getLength();
60
61 renderer.writeName(name_);
62 rrtype_.toWire(renderer);
63 rrclass_.toWire(renderer);
64
65 // Make sure the renderer has a room for the question
66 if (renderer.getLength() > renderer.getLengthLimit()) {
67 renderer.trim(renderer.getLength() - pos0);
68 renderer.setTruncated();
69 return (0);
70 }
71
72 return (1); // number of "entries"
73 }
74
75 ostream&
operator <<(std::ostream & os,const Question & question)76 operator<<(std::ostream& os, const Question& question) {
77 os << question.toText();
78 return (os);
79 }
80 }
81 }
82