Kea  2.1.7-git
rcode.cc
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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 <string>
10 #include <sstream>
11 #include <ostream>
12 
13 #include <exceptions/exceptions.h>
14 
15 #include <dns/rcode.h>
16 
17 using namespace std;
18 
19 namespace isc {
20 namespace dns {
21 namespace {
22 // This diagram shows the wire-format representation of the 12-bit extended
23 // form RCODEs and its relationship with implementation specific parameters.
24 //
25 // 0 3 11 15
26 // +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
27 // |UNUSED | EXTENDED-RCODE | RCODE |
28 // +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
29 // <= EXTRCODE_SHIFT (4 bits)
30 const unsigned int EXTRCODE_SHIFT = 4;
31 const unsigned int RCODE_MASK = 0x000f;
32 
33 
34 // EDNS-extended RCODEs are 12-bit unsigned integers. 0xfff is the highest.
35 const uint16_t MAX_RCODE = 0xfff;
36 
37 const char* const rcodetext[] = {
38  "NOERROR",
39  "FORMERR",
40  "SERVFAIL",
41  "NXDOMAIN",
42  "NOTIMP",
43  "REFUSED",
44  "YXDOMAIN",
45  "YXRRSET",
46  "NXRRSET",
47  "NOTAUTH",
48  "NOTZONE",
49  "RESERVED11",
50  "RESERVED12",
51  "RESERVED13",
52  "RESERVED14",
53  "RESERVED15",
54  "BADVERS"
55 };
56 }
57 
58 Rcode::Rcode(const uint16_t code) : code_(code) {
59  if (code_ > MAX_RCODE) {
60  isc_throw(OutOfRange, "Rcode is too large to construct");
61  }
62 }
63 
64 Rcode::Rcode(const uint8_t code, const uint8_t extended_code) :
65  code_((extended_code << EXTRCODE_SHIFT) | (code & RCODE_MASK))
66 {
67  if (code > RCODE_MASK) {
69  "Base Rcode is too large to construct: "
70  << static_cast<unsigned int>(code));
71  }
72 }
73 
74 uint8_t
76  return (code_ >> EXTRCODE_SHIFT);
77 }
78 
79 string
80 Rcode::toText() const {
81  if (code_ < sizeof(rcodetext) / sizeof (const char*)) {
82  return (rcodetext[code_]);
83  }
84 
85  ostringstream oss;
86  oss << code_;
87  return (oss.str());
88 }
89 
90 ostream&
91 operator<<(std::ostream& os, const Rcode& rcode) {
92  return (os << rcode.toText());
93 }
94 }
95 }
ostream & operator<<(std::ostream &os, const EDNS &edns)
Insert the EDNS as a string into stream.
Definition: edns.cc:172
STL namespace.
DNS Response Codes (RCODEs) class.
Definition: rcode.h:40
#define isc_throw(type, stream)
A shortcut macro to insert known values into exception arguments.
Rcode(const uint16_t code)
Constructor from the code value.
Definition: rcode.cc:58
std::string toText() const
Convert the Rcode to a string.
Definition: rcode.cc:80
uint8_t getExtendedCode() const
Returns the upper 8-bit of the Rcode code value.
Definition: rcode.cc:75
Defines the logger used by the top-level component of kea-lfc.
uint16_t code_
A generic exception that is thrown if a parameter given to a method would refer to or modify out-of-r...