root/net/dns/record_rdata.cc

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DEFINITIONS

This source file includes following definitions.
  1. port_
  2. Create
  3. Type
  4. IsEqual
  5. Create
  6. Type
  7. IsEqual
  8. Create
  9. Type
  10. IsEqual
  11. Create
  12. Type
  13. IsEqual
  14. Create
  15. Type
  16. IsEqual
  17. Create
  18. Type
  19. IsEqual
  20. Create
  21. Type
  22. IsEqual
  23. GetBit

// 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 "base/big_endian.h"
#include "net/base/dns_util.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
scoped_ptr<SrvRecordRdata> SrvRecordRdata::Create(
    const base::StringPiece& data,
    const DnsRecordParser& parser) {
  if (data.size() < kSrvRecordMinimumSize) return scoped_ptr<SrvRecordRdata>();

  scoped_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 scoped_ptr<SrvRecordRdata>();

  return rdata.Pass();
}

uint16 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
scoped_ptr<ARecordRdata> ARecordRdata::Create(
    const base::StringPiece& data,
    const DnsRecordParser& parser) {
  if (data.size() != kIPv4AddressSize)
    return scoped_ptr<ARecordRdata>();

  scoped_ptr<ARecordRdata> rdata(new ARecordRdata);

  rdata->address_.resize(kIPv4AddressSize);
  for (unsigned i = 0; i < kIPv4AddressSize; ++i) {
    rdata->address_[i] = data[i];
  }

  return rdata.Pass();
}

uint16 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
scoped_ptr<AAAARecordRdata> AAAARecordRdata::Create(
    const base::StringPiece& data,
    const DnsRecordParser& parser) {
  if (data.size() != kIPv6AddressSize)
    return scoped_ptr<AAAARecordRdata>();

  scoped_ptr<AAAARecordRdata> rdata(new AAAARecordRdata);

  rdata->address_.resize(kIPv6AddressSize);
  for (unsigned i = 0; i < kIPv6AddressSize; ++i) {
    rdata->address_[i] = data[i];
  }

  return rdata.Pass();
}

uint16 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
scoped_ptr<CnameRecordRdata> CnameRecordRdata::Create(
    const base::StringPiece& data,
    const DnsRecordParser& parser) {
  scoped_ptr<CnameRecordRdata> rdata(new CnameRecordRdata);

  if (!parser.ReadName(data.begin(), &rdata->cname_))
    return scoped_ptr<CnameRecordRdata>();

  return rdata.Pass();
}

uint16 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
scoped_ptr<PtrRecordRdata> PtrRecordRdata::Create(
    const base::StringPiece& data,
    const DnsRecordParser& parser) {
  scoped_ptr<PtrRecordRdata> rdata(new PtrRecordRdata);

  if (!parser.ReadName(data.begin(), &rdata->ptrdomain_))
    return scoped_ptr<PtrRecordRdata>();

  return rdata.Pass();
}

uint16 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
scoped_ptr<TxtRecordRdata> TxtRecordRdata::Create(
    const base::StringPiece& data,
    const DnsRecordParser& parser) {
  scoped_ptr<TxtRecordRdata> rdata(new TxtRecordRdata);

  for (size_t i = 0; i < data.size(); ) {
    uint8 length = data[i];

    if (i + length >= data.size())
      return scoped_ptr<TxtRecordRdata>();

    rdata->texts_.push_back(data.substr(i + 1, length).as_string());

    // Move to the next string.
    i += length + 1;
  }

  return rdata.Pass();
}

uint16 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
scoped_ptr<NsecRecordRdata> NsecRecordRdata::Create(
    const base::StringPiece& data,
    const DnsRecordParser& parser) {
  scoped_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 scoped_ptr<NsecRecordRdata>();

  struct BitmapHeader {
    uint8 block_number;  // The block number should be zero.
    uint8 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 scoped_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 scoped_ptr<NsecRecordRdata>();

  rdata->bitmap_.insert(rdata->bitmap_.begin(),
                        bitmap_data.begin(),
                        bitmap_data.end());

  return rdata.Pass();
}

uint16 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;
}

}  // namespace net

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