mirror of
https://github.com/klzgrad/naiveproxy.git
synced 2024-11-24 06:16:30 +03:00
344 lines
9.5 KiB
C++
344 lines
9.5 KiB
C++
// Copyright (c) 2013 The Chromium Authors. All rights reserved.
|
|
// Use of this source code is governed by a BSD-style license that can be
|
|
// found in the LICENSE file.
|
|
|
|
#include "net/dns/record_rdata.h"
|
|
|
|
#include <numeric>
|
|
|
|
#include "base/big_endian.h"
|
|
#include "net/dns/dns_protocol.h"
|
|
#include "net/dns/dns_response.h"
|
|
|
|
namespace net {
|
|
|
|
static const size_t kSrvRecordMinimumSize = 6;
|
|
|
|
RecordRdata::RecordRdata() {
|
|
}
|
|
|
|
SrvRecordRdata::SrvRecordRdata() : priority_(0), weight_(0), port_(0) {
|
|
}
|
|
|
|
SrvRecordRdata::~SrvRecordRdata() {}
|
|
|
|
// static
|
|
std::unique_ptr<SrvRecordRdata> SrvRecordRdata::Create(
|
|
const base::StringPiece& data,
|
|
const DnsRecordParser& parser) {
|
|
if (data.size() < kSrvRecordMinimumSize)
|
|
return std::unique_ptr<SrvRecordRdata>();
|
|
|
|
std::unique_ptr<SrvRecordRdata> rdata(new SrvRecordRdata);
|
|
|
|
base::BigEndianReader reader(data.data(), data.size());
|
|
// 2 bytes for priority, 2 bytes for weight, 2 bytes for port.
|
|
reader.ReadU16(&rdata->priority_);
|
|
reader.ReadU16(&rdata->weight_);
|
|
reader.ReadU16(&rdata->port_);
|
|
|
|
if (!parser.ReadName(data.substr(kSrvRecordMinimumSize).begin(),
|
|
&rdata->target_))
|
|
return std::unique_ptr<SrvRecordRdata>();
|
|
|
|
return rdata;
|
|
}
|
|
|
|
uint16_t SrvRecordRdata::Type() const {
|
|
return SrvRecordRdata::kType;
|
|
}
|
|
|
|
bool SrvRecordRdata::IsEqual(const RecordRdata* other) const {
|
|
if (other->Type() != Type()) return false;
|
|
const SrvRecordRdata* srv_other = static_cast<const SrvRecordRdata*>(other);
|
|
return weight_ == srv_other->weight_ &&
|
|
port_ == srv_other->port_ &&
|
|
priority_ == srv_other->priority_ &&
|
|
target_ == srv_other->target_;
|
|
}
|
|
|
|
ARecordRdata::ARecordRdata() {
|
|
}
|
|
|
|
ARecordRdata::~ARecordRdata() {
|
|
}
|
|
|
|
// static
|
|
std::unique_ptr<ARecordRdata> ARecordRdata::Create(
|
|
const base::StringPiece& data,
|
|
const DnsRecordParser& parser) {
|
|
if (data.size() != IPAddress::kIPv4AddressSize)
|
|
return std::unique_ptr<ARecordRdata>();
|
|
|
|
std::unique_ptr<ARecordRdata> rdata(new ARecordRdata);
|
|
rdata->address_ =
|
|
IPAddress(reinterpret_cast<const uint8_t*>(data.data()), data.length());
|
|
return rdata;
|
|
}
|
|
|
|
uint16_t ARecordRdata::Type() const {
|
|
return ARecordRdata::kType;
|
|
}
|
|
|
|
bool ARecordRdata::IsEqual(const RecordRdata* other) const {
|
|
if (other->Type() != Type()) return false;
|
|
const ARecordRdata* a_other = static_cast<const ARecordRdata*>(other);
|
|
return address_ == a_other->address_;
|
|
}
|
|
|
|
AAAARecordRdata::AAAARecordRdata() {
|
|
}
|
|
|
|
AAAARecordRdata::~AAAARecordRdata() {
|
|
}
|
|
|
|
// static
|
|
std::unique_ptr<AAAARecordRdata> AAAARecordRdata::Create(
|
|
const base::StringPiece& data,
|
|
const DnsRecordParser& parser) {
|
|
if (data.size() != IPAddress::kIPv6AddressSize)
|
|
return std::unique_ptr<AAAARecordRdata>();
|
|
|
|
std::unique_ptr<AAAARecordRdata> rdata(new AAAARecordRdata);
|
|
rdata->address_ =
|
|
IPAddress(reinterpret_cast<const uint8_t*>(data.data()), data.length());
|
|
return rdata;
|
|
}
|
|
|
|
uint16_t AAAARecordRdata::Type() const {
|
|
return AAAARecordRdata::kType;
|
|
}
|
|
|
|
bool AAAARecordRdata::IsEqual(const RecordRdata* other) const {
|
|
if (other->Type() != Type()) return false;
|
|
const AAAARecordRdata* a_other = static_cast<const AAAARecordRdata*>(other);
|
|
return address_ == a_other->address_;
|
|
}
|
|
|
|
CnameRecordRdata::CnameRecordRdata() {
|
|
}
|
|
|
|
CnameRecordRdata::~CnameRecordRdata() {
|
|
}
|
|
|
|
// static
|
|
std::unique_ptr<CnameRecordRdata> CnameRecordRdata::Create(
|
|
const base::StringPiece& data,
|
|
const DnsRecordParser& parser) {
|
|
std::unique_ptr<CnameRecordRdata> rdata(new CnameRecordRdata);
|
|
|
|
if (!parser.ReadName(data.begin(), &rdata->cname_))
|
|
return std::unique_ptr<CnameRecordRdata>();
|
|
|
|
return rdata;
|
|
}
|
|
|
|
uint16_t CnameRecordRdata::Type() const {
|
|
return CnameRecordRdata::kType;
|
|
}
|
|
|
|
bool CnameRecordRdata::IsEqual(const RecordRdata* other) const {
|
|
if (other->Type() != Type()) return false;
|
|
const CnameRecordRdata* cname_other =
|
|
static_cast<const CnameRecordRdata*>(other);
|
|
return cname_ == cname_other->cname_;
|
|
}
|
|
|
|
PtrRecordRdata::PtrRecordRdata() {
|
|
}
|
|
|
|
PtrRecordRdata::~PtrRecordRdata() {
|
|
}
|
|
|
|
// static
|
|
std::unique_ptr<PtrRecordRdata> PtrRecordRdata::Create(
|
|
const base::StringPiece& data,
|
|
const DnsRecordParser& parser) {
|
|
std::unique_ptr<PtrRecordRdata> rdata(new PtrRecordRdata);
|
|
|
|
if (!parser.ReadName(data.begin(), &rdata->ptrdomain_))
|
|
return std::unique_ptr<PtrRecordRdata>();
|
|
|
|
return rdata;
|
|
}
|
|
|
|
uint16_t PtrRecordRdata::Type() const {
|
|
return PtrRecordRdata::kType;
|
|
}
|
|
|
|
bool PtrRecordRdata::IsEqual(const RecordRdata* other) const {
|
|
if (other->Type() != Type()) return false;
|
|
const PtrRecordRdata* ptr_other = static_cast<const PtrRecordRdata*>(other);
|
|
return ptrdomain_ == ptr_other->ptrdomain_;
|
|
}
|
|
|
|
TxtRecordRdata::TxtRecordRdata() {
|
|
}
|
|
|
|
TxtRecordRdata::~TxtRecordRdata() {
|
|
}
|
|
|
|
// static
|
|
std::unique_ptr<TxtRecordRdata> TxtRecordRdata::Create(
|
|
const base::StringPiece& data,
|
|
const DnsRecordParser& parser) {
|
|
std::unique_ptr<TxtRecordRdata> rdata(new TxtRecordRdata);
|
|
|
|
for (size_t i = 0; i < data.size(); ) {
|
|
uint8_t length = data[i];
|
|
|
|
if (i + length >= data.size())
|
|
return std::unique_ptr<TxtRecordRdata>();
|
|
|
|
rdata->texts_.push_back(data.substr(i + 1, length).as_string());
|
|
|
|
// Move to the next string.
|
|
i += length + 1;
|
|
}
|
|
|
|
return rdata;
|
|
}
|
|
|
|
uint16_t TxtRecordRdata::Type() const {
|
|
return TxtRecordRdata::kType;
|
|
}
|
|
|
|
bool TxtRecordRdata::IsEqual(const RecordRdata* other) const {
|
|
if (other->Type() != Type()) return false;
|
|
const TxtRecordRdata* txt_other = static_cast<const TxtRecordRdata*>(other);
|
|
return texts_ == txt_other->texts_;
|
|
}
|
|
|
|
NsecRecordRdata::NsecRecordRdata() {
|
|
}
|
|
|
|
NsecRecordRdata::~NsecRecordRdata() {
|
|
}
|
|
|
|
// static
|
|
std::unique_ptr<NsecRecordRdata> NsecRecordRdata::Create(
|
|
const base::StringPiece& data,
|
|
const DnsRecordParser& parser) {
|
|
std::unique_ptr<NsecRecordRdata> rdata(new NsecRecordRdata);
|
|
|
|
// Read the "next domain". This part for the NSEC record format is
|
|
// ignored for mDNS, since it has no semantic meaning.
|
|
unsigned next_domain_length = parser.ReadName(data.data(), NULL);
|
|
|
|
// If we did not succeed in getting the next domain or the data length
|
|
// is too short for reading the bitmap header, return.
|
|
if (next_domain_length == 0 || data.length() < next_domain_length + 2)
|
|
return std::unique_ptr<NsecRecordRdata>();
|
|
|
|
struct BitmapHeader {
|
|
uint8_t block_number; // The block number should be zero.
|
|
uint8_t length; // Bitmap length in bytes. Between 1 and 32.
|
|
};
|
|
|
|
const BitmapHeader* header = reinterpret_cast<const BitmapHeader*>(
|
|
data.data() + next_domain_length);
|
|
|
|
// The block number must be zero in mDns-specific NSEC records. The bitmap
|
|
// length must be between 1 and 32.
|
|
if (header->block_number != 0 || header->length == 0 || header->length > 32)
|
|
return std::unique_ptr<NsecRecordRdata>();
|
|
|
|
base::StringPiece bitmap_data = data.substr(next_domain_length + 2);
|
|
|
|
// Since we may only have one block, the data length must be exactly equal to
|
|
// the domain length plus bitmap size.
|
|
if (bitmap_data.length() != header->length)
|
|
return std::unique_ptr<NsecRecordRdata>();
|
|
|
|
rdata->bitmap_.insert(rdata->bitmap_.begin(),
|
|
bitmap_data.begin(),
|
|
bitmap_data.end());
|
|
|
|
return rdata;
|
|
}
|
|
|
|
uint16_t NsecRecordRdata::Type() const {
|
|
return NsecRecordRdata::kType;
|
|
}
|
|
|
|
bool NsecRecordRdata::IsEqual(const RecordRdata* other) const {
|
|
if (other->Type() != Type())
|
|
return false;
|
|
const NsecRecordRdata* nsec_other =
|
|
static_cast<const NsecRecordRdata*>(other);
|
|
return bitmap_ == nsec_other->bitmap_;
|
|
}
|
|
|
|
bool NsecRecordRdata::GetBit(unsigned i) const {
|
|
unsigned byte_num = i/8;
|
|
if (bitmap_.size() < byte_num + 1)
|
|
return false;
|
|
|
|
unsigned bit_num = 7 - i % 8;
|
|
return (bitmap_[byte_num] & (1 << bit_num)) != 0;
|
|
}
|
|
|
|
OptRecordRdata::OptRecordRdata() {}
|
|
|
|
OptRecordRdata::~OptRecordRdata() {}
|
|
|
|
// static
|
|
std::unique_ptr<OptRecordRdata> OptRecordRdata::Create(
|
|
const base::StringPiece& data,
|
|
const DnsRecordParser& parser) {
|
|
std::unique_ptr<OptRecordRdata> rdata(new OptRecordRdata);
|
|
rdata->buf_.assign(data.begin(), data.end());
|
|
|
|
base::BigEndianReader reader(data.data(), data.size());
|
|
while (reader.remaining() > 0) {
|
|
uint16_t opt_code, opt_data_size;
|
|
base::StringPiece opt_data;
|
|
|
|
if (!(reader.ReadU16(&opt_code) && reader.ReadU16(&opt_data_size) &&
|
|
reader.ReadPiece(&opt_data, opt_data_size))) {
|
|
return std::unique_ptr<OptRecordRdata>();
|
|
}
|
|
rdata->opts_.push_back(Opt(opt_code, opt_data));
|
|
}
|
|
|
|
return rdata;
|
|
}
|
|
|
|
uint16_t OptRecordRdata::Type() const {
|
|
return OptRecordRdata::kType;
|
|
}
|
|
|
|
bool OptRecordRdata::IsEqual(const RecordRdata* other) const {
|
|
if (other->Type() != Type())
|
|
return false;
|
|
const OptRecordRdata* opt_other = static_cast<const OptRecordRdata*>(other);
|
|
return opt_other->opts_ == opts_;
|
|
}
|
|
|
|
void OptRecordRdata::AddOpt(const Opt& opt) {
|
|
base::StringPiece opt_data = opt.data();
|
|
|
|
// Resize buffer to accommodate new OPT.
|
|
const size_t orig_rdata_size = buf_.size();
|
|
buf_.resize(orig_rdata_size + Opt::kHeaderSize + opt_data.size());
|
|
|
|
// Start writing from the end of the existing rdata.
|
|
base::BigEndianWriter writer(buf_.data() + orig_rdata_size, buf_.size());
|
|
bool success = writer.WriteU16(opt.code()) &&
|
|
writer.WriteU16(opt_data.size()) &&
|
|
writer.WriteBytes(opt_data.data(), opt_data.size());
|
|
DCHECK(success);
|
|
|
|
opts_.push_back(opt);
|
|
}
|
|
|
|
OptRecordRdata::Opt::Opt(uint16_t code, base::StringPiece data) : code_(code) {
|
|
data.CopyToString(&data_);
|
|
}
|
|
|
|
bool OptRecordRdata::Opt::operator==(const OptRecordRdata::Opt& other) const {
|
|
return code_ == other.code_ && data_ == other.data_;
|
|
}
|
|
|
|
} // namespace net
|