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// Copyright (c) 2012 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/address_sorter.h"
#include <winsock2.h>
#include <algorithm>
#include "base/bind.h"
#include "base/location.h"
#include "base/logging.h"
#include "base/macros.h"
#include "base/memory/free_deleter.h"
#include "base/threading/worker_pool.h"
#include "base/win/windows_version.h"
#include "net/base/address_list.h"
#include "net/base/ip_endpoint.h"
#include "net/base/winsock_init.h"
namespace net {
namespace {
class AddressSorterWin : public AddressSorter {
public:
AddressSorterWin() {
EnsureWinsockInit();
}
~AddressSorterWin() override {}
// AddressSorter:
void Sort(const AddressList& list,
const CallbackType& callback) const override {
DCHECK(!list.empty());
scoped_refptr<Job> job = new Job(list, callback);
}
private:
// Executes the SIO_ADDRESS_LIST_SORT ioctl on the WorkerPool, and
// performs the necessary conversions to/from AddressList.
class Job : public base::RefCountedThreadSafe<Job> {
public:
Job(const AddressList& list, const CallbackType& callback)
: callback_(callback),
buffer_size_(sizeof(SOCKET_ADDRESS_LIST) +
list.size() * (sizeof(SOCKET_ADDRESS) +
sizeof(SOCKADDR_STORAGE))),
input_buffer_(reinterpret_cast<SOCKET_ADDRESS_LIST*>(
malloc(buffer_size_))),
output_buffer_(reinterpret_cast<SOCKET_ADDRESS_LIST*>(
malloc(buffer_size_))),
success_(false) {
input_buffer_->iAddressCount = list.size();
SOCKADDR_STORAGE* storage = reinterpret_cast<SOCKADDR_STORAGE*>(
input_buffer_->Address + input_buffer_->iAddressCount);
for (size_t i = 0; i < list.size(); ++i) {
IPEndPoint ipe = list[i];
// Addresses must be sockaddr_in6.
if (ipe.GetFamily() == ADDRESS_FAMILY_IPV4) {
ipe = IPEndPoint(ConvertIPv4NumberToIPv6Number(ipe.address().bytes()),
ipe.port());
}
struct sockaddr* addr = reinterpret_cast<struct sockaddr*>(storage + i);
socklen_t addr_len = sizeof(SOCKADDR_STORAGE);
bool result = ipe.ToSockAddr(addr, &addr_len);
DCHECK(result);
input_buffer_->Address[i].lpSockaddr = addr;
input_buffer_->Address[i].iSockaddrLength = addr_len;
}
if (!base::WorkerPool::PostTaskAndReply(
FROM_HERE,
base::Bind(&Job::Run, this),
base::Bind(&Job::OnComplete, this),
false /* task is slow */)) {
LOG(ERROR) << "WorkerPool::PostTaskAndReply failed";
OnComplete();
}
}
private:
friend class base::RefCountedThreadSafe<Job>;
~Job() {}
// Executed on the WorkerPool.
void Run() {
SOCKET sock = socket(AF_INET6, SOCK_DGRAM, IPPROTO_UDP);
if (sock == INVALID_SOCKET)
return;
DWORD result_size = 0;
int result = WSAIoctl(sock, SIO_ADDRESS_LIST_SORT, input_buffer_.get(),
buffer_size_, output_buffer_.get(), buffer_size_,
&result_size, NULL, NULL);
if (result == SOCKET_ERROR) {
LOG(ERROR) << "SIO_ADDRESS_LIST_SORT failed " << WSAGetLastError();
} else {
success_ = true;
}
closesocket(sock);
}
// Executed on the calling thread.
void OnComplete() {
AddressList list;
if (success_) {
list.reserve(output_buffer_->iAddressCount);
for (int i = 0; i < output_buffer_->iAddressCount; ++i) {
IPEndPoint ipe;
bool result =
ipe.FromSockAddr(output_buffer_->Address[i].lpSockaddr,
output_buffer_->Address[i].iSockaddrLength);
DCHECK(result) << "Unable to roundtrip between IPEndPoint and "
<< "SOCKET_ADDRESS!";
// Unmap V4MAPPED IPv6 addresses so that Happy Eyeballs works.
if (IsIPv4Mapped(ipe.address().bytes())) {
ipe = IPEndPoint(ConvertIPv4MappedToIPv4(ipe.address().bytes()),
ipe.port());
}
list.push_back(ipe);
}
}
callback_.Run(success_, list);
}
const CallbackType callback_;
const size_t buffer_size_;
scoped_ptr<SOCKET_ADDRESS_LIST, base::FreeDeleter> input_buffer_;
scoped_ptr<SOCKET_ADDRESS_LIST, base::FreeDeleter> output_buffer_;
bool success_;
DISALLOW_COPY_AND_ASSIGN(Job);
};
DISALLOW_COPY_AND_ASSIGN(AddressSorterWin);
};
// Merges |list_ipv4| and |list_ipv6| before passing it to |callback|, but
// only if |success| is true.
void MergeResults(const AddressSorter::CallbackType& callback,
const AddressList& list_ipv4,
bool success,
const AddressList& list_ipv6) {
if (!success) {
callback.Run(false, AddressList());
return;
}
AddressList list;
list.insert(list.end(), list_ipv6.begin(), list_ipv6.end());
list.insert(list.end(), list_ipv4.begin(), list_ipv4.end());
callback.Run(true, list);
}
// Wrapper for AddressSorterWin which does not sort IPv4 or IPv4-mapped
// addresses but always puts them at the end of the list. Needed because the
// SIO_ADDRESS_LIST_SORT does not support IPv4 addresses on Windows XP.
class AddressSorterWinXP : public AddressSorter {
public:
AddressSorterWinXP() {}
~AddressSorterWinXP() override {}
// AddressSorter:
void Sort(const AddressList& list,
const CallbackType& callback) const override {
AddressList list_ipv4;
AddressList list_ipv6;
for (size_t i = 0; i < list.size(); ++i) {
const IPEndPoint& ipe = list[i];
if (ipe.GetFamily() == ADDRESS_FAMILY_IPV4) {
list_ipv4.push_back(ipe);
} else {
list_ipv6.push_back(ipe);
}
}
if (!list_ipv6.empty()) {
sorter_.Sort(list_ipv6, base::Bind(&MergeResults, callback, list_ipv4));
} else {
NOTREACHED() << "Should not be called with IPv4-only addresses.";
callback.Run(true, list);
}
}
private:
AddressSorterWin sorter_;
DISALLOW_COPY_AND_ASSIGN(AddressSorterWinXP);
};
} // namespace
// static
scoped_ptr<AddressSorter> AddressSorter::CreateAddressSorter() {
if (base::win::GetVersion() < base::win::VERSION_VISTA)
return scoped_ptr<AddressSorter>(new AddressSorterWinXP());
return scoped_ptr<AddressSorter>(new AddressSorterWin());
}
} // namespace net
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