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// Copyright (C) 2010-2015 Internet Systems Consortium, Inc. ("ISC")
//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at http://mozilla.org/MPL/2.0/.
#include <config.h>
#include <string>
#include <sstream>
#include <ostream>
#include <exceptions/exceptions.h>
#include <dns/rcode.h>
using namespace std;
namespace isc {
namespace dns {
namespace {
// This diagram shows the wire-format representation of the 12-bit extended
// form RCODEs and its relationship with implementation specific parameters.
//
// 0 3 11 15
// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
// |UNUSED | EXTENDED-RCODE | RCODE |
// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
// <= EXTRCODE_SHIFT (4 bits)
const unsigned int EXTRCODE_SHIFT = 4;
const unsigned int RCODE_MASK = 0x000f;
// EDNS-extended RCODEs are 12-bit unsigned integers. 0xfff is the highest.
const uint16_t MAX_RCODE = 0xfff;
const char* const rcodetext[] = {
"NOERROR",
"FORMERR",
"SERVFAIL",
"NXDOMAIN",
"NOTIMP",
"REFUSED",
"YXDOMAIN",
"YXRRSET",
"NXRRSET",
"NOTAUTH",
"NOTZONE",
"RESERVED11",
"RESERVED12",
"RESERVED13",
"RESERVED14",
"RESERVED15",
"BADVERS"
};
}
Rcode::Rcode(const uint16_t code) : code_(code) {
if (code_ > MAX_RCODE) {
isc_throw(OutOfRange, "Rcode is too large to construct");
}
}
Rcode::Rcode(const uint8_t code, const uint8_t extended_code) :
code_((extended_code << EXTRCODE_SHIFT) | (code & RCODE_MASK))
{
if (code > RCODE_MASK) {
isc_throw(OutOfRange,
"Base Rcode is too large to construct: "
<< static_cast<unsigned int>(code));
}
}
uint8_t
Rcode::getExtendedCode() const {
return (code_ >> EXTRCODE_SHIFT);
}
string
Rcode::toText() const {
if (code_ < sizeof(rcodetext) / sizeof (const char*)) {
return (rcodetext[code_]);
}
ostringstream oss;
oss << code_;
return (oss.str());
}
ostream&
operator<<(std::ostream& os, const Rcode& rcode) {
return (os << rcode.toText());
}
}
}
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