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// Copyright (C) 2010-2016 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 <exceptions/exceptions.h>
#include <util/buffer.h>
#include <util/encode/hex.h>
#include <dns/name.h>
#include <dns/messagerenderer.h>
#include <dns/master_lexer.h>
#include <dns/rdata.h>
#include <dns/rrparamregistry.h>
#include <dns/rrtype.h>
#include <boost/lexical_cast.hpp>
#include <boost/shared_ptr.hpp>
#include <algorithm>
#include <cctype>
#include <string>
#include <sstream>
#include <iomanip>
#include <ios>
#include <ostream>
#include <vector>
#include <stdint.h>
#include <string.h>
using namespace std;
using boost::lexical_cast;
using namespace isc::util;
namespace isc {
namespace dns {
namespace rdata {
uint16_t
Rdata::getLength() const {
OutputBuffer obuffer(0);
toWire(obuffer);
return (obuffer.getLength());
}
// XXX: we need to specify std:: for string to help doxygen match the
// function signature with that given in the header file.
RdataPtr
createRdata(const RRType& rrtype, const RRClass& rrclass,
const std::string& rdata_string)
{
return (RRParamRegistry::getRegistry().createRdata(rrtype, rrclass,
rdata_string));
}
RdataPtr
createRdata(const RRType& rrtype, const RRClass& rrclass,
isc::util::InputBuffer& buffer, size_t len)
{
if (len > MAX_RDLENGTH) {
isc_throw(InvalidRdataLength, "RDLENGTH too large");
}
size_t old_pos = buffer.getPosition();
RdataPtr rdata =
RRParamRegistry::getRegistry().createRdata(rrtype, rrclass, buffer,
len);
if (buffer.getPosition() - old_pos != len) {
isc_throw(InvalidRdataLength, "RDLENGTH mismatch: " <<
buffer.getPosition() - old_pos << " != " << len);
}
return (rdata);
}
RdataPtr
createRdata(const RRType& rrtype, const RRClass& rrclass, const Rdata& source)
{
return (RRParamRegistry::getRegistry().createRdata(rrtype, rrclass,
source));
}
namespace {
void
fromtextError(bool& error_issued, const MasterLexer& lexer,
MasterLoaderCallbacks& callbacks,
const MasterToken* token, const char* reason)
{
// Don't be too noisy if there are many issues for single RDATA
if (error_issued) {
return;
}
error_issued = true;
if (token == NULL) {
callbacks.error(lexer.getSourceName(), lexer.getSourceLine(),
"createRdata from text failed: " + string(reason));
return;
}
switch (token->getType()) {
case MasterToken::STRING:
case MasterToken::QSTRING:
callbacks.error(lexer.getSourceName(), lexer.getSourceLine(),
"createRdata from text failed near '" +
token->getString() + "': " + string(reason));
break;
case MasterToken::ERROR:
callbacks.error(lexer.getSourceName(), lexer.getSourceLine(),
"createRdata from text failed: " +
token->getErrorText());
break;
default:
// This case shouldn't happen based on how we use MasterLexer in
// createRdata(), so we could assert() that here. But since it
// depends on detailed behavior of other classes, we treat the case
// in a bit less harsh way.
isc_throw(Unexpected, "bug: createRdata() saw unexpected token type");
}
}
}
RdataPtr
createRdata(const RRType& rrtype, const RRClass& rrclass,
MasterLexer& lexer, const Name* origin,
MasterLoader::Options options,
MasterLoaderCallbacks& callbacks)
{
RdataPtr rdata;
bool error_issued = false;
try {
rdata = RRParamRegistry::getRegistry().createRdata(
rrtype, rrclass, lexer, origin, options, callbacks);
} catch (const MasterLexer::LexerError& error) {
fromtextError(error_issued, lexer, callbacks, &error.token_, "");
} catch (const Exception& ex) {
// Catching all isc::Exception is too broad, but right now we don't
// have better granularity. When we complete #2518 we can make this
// finer.
fromtextError(error_issued, lexer, callbacks, NULL, ex.what());
}
// Other exceptions mean a serious implementation bug or fatal system
// error; it doesn't make sense to catch and try to recover from them
// here. Just propagate.
// Consume to end of line / file.
// Call callback via fromtextError once if there was an error.
do {
const MasterToken& token = lexer.getNextToken();
switch (token.getType()) {
case MasterToken::END_OF_LINE:
return (rdata);
case MasterToken::END_OF_FILE:
callbacks.warning(lexer.getSourceName(), lexer.getSourceLine(),
"file does not end with newline");
return (rdata);
default:
rdata.reset(); // we'll return NULL
fromtextError(error_issued, lexer, callbacks, &token,
"extra input text");
// Continue until we see EOL or EOF
}
} while (true);
// We shouldn't reach here
assert(false);
return (RdataPtr()); // add explicit return to silence some compilers
}
int
compareNames(const Name& n1, const Name& n2) {
size_t len1 = n1.getLength();
size_t len2 = n2.getLength();
size_t cmplen = min(len1, len2);
for (size_t i = 0; i < cmplen; ++i) {
uint8_t c1 = tolower(n1.at(i));
uint8_t c2 = tolower(n2.at(i));
if (c1 < c2) {
return (-1);
} else if (c1 > c2) {
return (1);
}
}
return ((len1 == len2) ? 0 : (len1 < len2) ? -1 : 1);
}
namespace generic {
struct GenericImpl {
GenericImpl(const vector<uint8_t>& data) : data_(data) {}
vector<uint8_t> data_;
};
Generic::Generic(isc::util::InputBuffer& buffer, size_t rdata_len) {
if (rdata_len > MAX_RDLENGTH) {
isc_throw(InvalidRdataLength, "RDLENGTH too large");
}
vector<uint8_t> data(rdata_len);
if (rdata_len > 0) {
buffer.readData(&data[0], rdata_len);
}
impl_ = new GenericImpl(data);
}
GenericImpl*
Generic::constructFromLexer(MasterLexer& lexer) {
const MasterToken& token = lexer.getNextToken(MasterToken::STRING);
if (token.getString() != "\\#") {
isc_throw(InvalidRdataText,
"Missing the special token (\\#) for "
"unknown RDATA encoding");
}
// Initialize with an absurd value.
uint32_t rdlen = 65536;
try {
rdlen = lexer.getNextToken(MasterToken::NUMBER).getNumber();
} catch (const MasterLexer::LexerError&) {
isc_throw(InvalidRdataLength,
"Unknown RDATA length is invalid");
}
if (rdlen > 65535) {
isc_throw(InvalidRdataLength,
"Unknown RDATA length is out of range: " << rdlen);
}
vector<uint8_t> data;
if (rdlen > 0) {
string hex_txt;
string hex_part;
// Whitespace is allowed within hex data, so read to the end of input.
while (true) {
const MasterToken& token =
lexer.getNextToken(MasterToken::STRING, true);
if ((token.getType() == MasterToken::END_OF_FILE) ||
(token.getType() == MasterToken::END_OF_LINE)) {
// Unget the last read token as createRdata() expects us
// to leave it at the end-of-line or end-of-file when we
// return.
lexer.ungetToken();
break;
}
token.getString(hex_part);
hex_txt.append(hex_part);
}
try {
isc::util::encode::decodeHex(hex_txt, data);
} catch (const isc::BadValue& ex) {
isc_throw(InvalidRdataText,
"Invalid hex encoding of generic RDATA: " << ex.what());
}
}
if (data.size() != rdlen) {
isc_throw(InvalidRdataLength,
"Size of unknown RDATA hex data doesn't match RDLENGTH: "
<< data.size() << " vs. " << rdlen);
}
return (new GenericImpl(data));
}
Generic::Generic(const std::string& rdata_string) :
impl_(NULL)
{
// We use unique_ptr here because if there is an exception in this
// constructor, the destructor is not called and there could be a
// leak of the GenericImpl that constructFromLexer() returns.
std::unique_ptr<GenericImpl> impl_ptr;
try {
std::istringstream ss(rdata_string);
MasterLexer lexer;
lexer.pushSource(ss);
impl_ptr.reset(constructFromLexer(lexer));
if (lexer.getNextToken().getType() != MasterToken::END_OF_FILE) {
isc_throw(InvalidRdataText, "extra input text for unknown RDATA: "
<< rdata_string);
}
} catch (const MasterLexer::LexerError& ex) {
isc_throw(InvalidRdataText, "Failed to construct unknown RDATA "
"from '" << rdata_string << "': " << ex.what());
}
impl_ = impl_ptr.release();
}
Generic::Generic(MasterLexer& lexer, const Name*,
MasterLoader::Options,
MasterLoaderCallbacks&) :
impl_(constructFromLexer(lexer))
{
}
Generic::~Generic() {
delete impl_;
}
Generic::Generic(const Generic& source) :
Rdata(), impl_(new GenericImpl(*source.impl_))
{}
Generic&
// Our check is better than the usual if (this == &source),
// but cppcheck doesn't recognize it.
// cppcheck-suppress operatorEqToSelf
Generic::operator=(const Generic& source) {
if (impl_ == source.impl_) {
return (*this);
}
GenericImpl* newimpl = new GenericImpl(*source.impl_);
delete impl_;
impl_ = newimpl;
return (*this);
}
namespace {
class UnknownRdataDumper {
public:
UnknownRdataDumper(ostringstream& oss) : oss_(&oss) {}
void operator()(const unsigned char d)
{
*oss_ << setw(2) << static_cast<unsigned int>(d);
}
private:
ostringstream* oss_;
};
}
string
Generic::toText() const {
ostringstream oss;
oss << "\\# " << impl_->data_.size() << " ";
oss.fill('0');
oss << right << hex;
for_each(impl_->data_.begin(), impl_->data_.end(), UnknownRdataDumper(oss));
return (oss.str());
}
void
Generic::toWire(isc::util::OutputBuffer& buffer) const {
buffer.writeData(&impl_->data_[0], impl_->data_.size());
}
void
Generic::toWire(AbstractMessageRenderer& renderer) const {
renderer.writeData(&impl_->data_[0], impl_->data_.size());
}
namespace {
inline int
compare_internal(const GenericImpl& lhs, const GenericImpl& rhs) {
size_t this_len = lhs.data_.size();
size_t other_len = rhs.data_.size();
size_t len = (this_len < other_len) ? this_len : other_len;
int cmp;
// TODO: is there a need to check len - should we just assert?
// (Depends if it is possible for rdata to have zero length)
if ((len != 0) &&
((cmp = memcmp(&lhs.data_[0], &rhs.data_[0], len)) != 0)) {
return (cmp);
} else {
return ((this_len == other_len) ? 0 :
(this_len < other_len) ? -1 : 1);
}
}
}
int
Generic::compare(const Rdata& other) const {
const Generic& other_rdata = dynamic_cast<const Generic&>(other);
return (compare_internal(*impl_, *other_rdata.impl_));
}
std::ostream&
operator<<(std::ostream& os, const Generic& rdata) {
return (os << rdata.toText());
}
} // end of namespace generic
} // end of namespace rdata
}
}
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