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// Copyright (C) 2010-2024 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 <util/buffer.h>
#include <dns/messagerenderer.h>
#include <dns/rdata.h>
#include <dns/rdataclass.h>
#include <string>
#include <string.h>
using namespace std;
using namespace isc::util;
// BEGIN_ISC_NAMESPACE
// BEGIN_RDATA_NAMESPACE
/// \brief Constructor.
OPT::PseudoRR::PseudoRR(uint16_t code,
boost::shared_ptr<std::vector<uint8_t> >& data) :
code_(code),
data_(data)
{
}
uint16_t
OPT::PseudoRR::getCode() const {
return (code_);
}
const uint8_t*
OPT::PseudoRR::getData() const {
return (&(*data_)[0]);
}
uint16_t
OPT::PseudoRR::getLength() const {
return (data_->size());
}
struct OPTImpl {
OPTImpl() :
rdlength_(0)
{}
uint16_t rdlength_;
std::vector<OPT::PseudoRR> pseudo_rrs_;
};
/// \brief Default constructor.
OPT::OPT() :
impl_(new OPTImpl)
{
}
/// \brief Constructor from string.
///
/// This constructor cannot be used, and always throws an exception.
///
/// \throw InvalidRdataText OPT RR cannot be constructed from text.
OPT::OPT(const std::string&) :
impl_(NULL)
{
isc_throw(InvalidRdataText, "OPT RR cannot be constructed from text");
}
/// \brief Constructor with a context of MasterLexer.
///
/// This constructor cannot be used, and always throws an exception.
///
/// \throw InvalidRdataText OPT RR cannot be constructed from text.
OPT::OPT(MasterLexer&, const Name*,
MasterLoader::Options, MasterLoaderCallbacks&) :
impl_(NULL)
{
isc_throw(InvalidRdataText, "OPT RR cannot be constructed from text");
}
OPT::OPT(InputBuffer& buffer, size_t rdata_len) :
impl_(NULL)
{
std::unique_ptr<OPTImpl> impl_ptr(new OPTImpl);
while (true) {
if (rdata_len == 0) {
break;
}
if (rdata_len < 4) {
isc_throw(InvalidRdataLength,
"Pseudo OPT RR record too short: "
<< rdata_len << " bytes");
}
const uint16_t option_code = buffer.readUint16();
const uint16_t option_length = buffer.readUint16();
rdata_len -= 4;
if (static_cast<uint16_t>(impl_ptr->rdlength_ + option_length) <
impl_ptr->rdlength_)
{
isc_throw(InvalidRdataText,
"Option length " << option_length
<< " would overflow OPT RR RDLEN (currently "
<< impl_ptr->rdlength_ << ").");
}
if (rdata_len < option_length) {
isc_throw(InvalidRdataLength, "Corrupt pseudo OPT RR record");
}
boost::shared_ptr<std::vector<uint8_t> >
option_data(new std::vector<uint8_t>(option_length));
buffer.readData(&(*option_data)[0], option_length);
impl_ptr->pseudo_rrs_.push_back(PseudoRR(option_code, option_data));
impl_ptr->rdlength_ += option_length;
rdata_len -= option_length;
}
impl_ = impl_ptr.release();
}
OPT::OPT(const OPT& other) :
Rdata(), impl_(new OPTImpl(*other.impl_))
{
}
OPT&
OPT::operator=(const OPT& source) {
if (this == &source) {
return (*this);
}
OPTImpl* newimpl = new OPTImpl(*source.impl_);
delete impl_;
impl_ = newimpl;
return (*this);
}
OPT::~OPT() {
delete impl_;
}
std::string
OPT::toText() const {
isc_throw(isc::InvalidOperation,
"OPT RRs do not have a presentation format");
}
void
OPT::toWire(OutputBuffer& buffer) const {
for (auto const& pseudo_rr : impl_->pseudo_rrs_) {
buffer.writeUint16(pseudo_rr.getCode());
const uint16_t length = pseudo_rr.getLength();
buffer.writeUint16(length);
if (length > 0) {
buffer.writeData(pseudo_rr.getData(), length);
}
}
}
void
OPT::toWire(AbstractMessageRenderer& renderer) const {
for (auto const& pseudo_rr : impl_->pseudo_rrs_) {
renderer.writeUint16(pseudo_rr.getCode());
const uint16_t length = pseudo_rr.getLength();
renderer.writeUint16(length);
if (length > 0) {
renderer.writeData(pseudo_rr.getData(), length);
}
}
}
int
OPT::compare(const Rdata&) const {
isc_throw(isc::InvalidOperation,
"It is meaningless to compare a set of OPT pseudo RRs; "
"they have unspecified order");
return (0);
}
void
OPT::appendPseudoRR(uint16_t code, const uint8_t* data, uint16_t length) {
// See if it overflows 16-bit length field. We only worry about the
// pseudo-RR length here, not the whole message length (which should
// be checked and enforced elsewhere).
if (static_cast<uint16_t>(impl_->rdlength_ + length) <
impl_->rdlength_)
{
isc_throw(isc::InvalidParameter,
"Option length " << length
<< " would overflow OPT RR RDLEN (currently "
<< impl_->rdlength_ << ").");
}
boost::shared_ptr<std::vector<uint8_t> >
option_data(new std::vector<uint8_t>(length));
if (length != 0) {
std::memcpy(&(*option_data)[0], data, length);
}
impl_->pseudo_rrs_.push_back(PseudoRR(code, option_data));
impl_->rdlength_ += length;
}
const std::vector<OPT::PseudoRR>&
OPT::getPseudoRRs() const {
return (impl_->pseudo_rrs_);
}
// END_RDATA_NAMESPACE
// END_ISC_NAMESPACE
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