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// Copyright 2012 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifdef UNSAFE_BUFFERS_BUILD
// TODO(crbug.com/40284755): Remove this and spanify to fix the errors.
#pragma allow_unsafe_buffers
#endif
#include "net/dns/address_sorter.h"
#include <winsock2.h>
#include <algorithm>
#include <utility>
#include <vector>
#include "base/functional/bind.h"
#include "base/location.h"
#include "base/logging.h"
#include "base/memory/free_deleter.h"
#include "base/task/thread_pool.h"
#include "net/base/ip_address.h"
#include "net/base/ip_endpoint.h"
#include "net/base/winsock_init.h"
namespace net {
namespace {
class AddressSorterWin : public AddressSorter {
public:
AddressSorterWin() {
EnsureWinsockInit();
}
AddressSorterWin(const AddressSorterWin&) = delete;
AddressSorterWin& operator=(const AddressSorterWin&) = delete;
~AddressSorterWin() override {}
// AddressSorter:
void Sort(const std::vector<IPEndPoint>& endpoints,
CallbackType callback) const override {
DCHECK(!endpoints.empty());
Job::Start(endpoints, std::move(callback));
}
private:
// Executes the SIO_ADDRESS_LIST_SORT ioctl asynchronously, and
// performs the necessary conversions to/from `std::vector<IPEndPoint>`.
class Job : public base::RefCountedThreadSafe<Job> {
public:
static void Start(const std::vector<IPEndPoint>& endpoints,
CallbackType callback) {
auto job = base::WrapRefCounted(new Job(endpoints, std::move(callback)));
base::ThreadPool::PostTaskAndReply(
FROM_HERE,
{base::MayBlock(), base::TaskShutdownBehavior::CONTINUE_ON_SHUTDOWN},
base::BindOnce(&Job::Run, job),
base::BindOnce(&Job::OnComplete, job));
}
Job(const Job&) = delete;
Job& operator=(const Job&) = delete;
private:
friend class base::RefCountedThreadSafe<Job>;
Job(const std::vector<IPEndPoint>& endpoints, CallbackType callback)
: callback_(std::move(callback)),
buffer_size_((sizeof(SOCKET_ADDRESS_LIST) +
base::CheckedNumeric<DWORD>(endpoints.size()) *
(sizeof(SOCKET_ADDRESS) + sizeof(SOCKADDR_STORAGE)))
.ValueOrDie<DWORD>()),
input_buffer_(
reinterpret_cast<SOCKET_ADDRESS_LIST*>(malloc(buffer_size_))),
output_buffer_(
reinterpret_cast<SOCKET_ADDRESS_LIST*>(malloc(buffer_size_))) {
input_buffer_->iAddressCount = base::checked_cast<INT>(endpoints.size());
SOCKADDR_STORAGE* storage = reinterpret_cast<SOCKADDR_STORAGE*>(
input_buffer_->Address + input_buffer_->iAddressCount);
for (size_t i = 0; i < endpoints.size(); ++i) {
IPEndPoint ipe = endpoints[i];
// Addresses must be sockaddr_in6.
if (ipe.address().IsIPv4()) {
ipe = IPEndPoint(ConvertIPv4ToIPv4MappedIPv6(ipe.address()),
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;
}
}
~Job() {}
// Executed asynchronously in ThreadPool.
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, nullptr, nullptr);
if (result == SOCKET_ERROR) {
LOG(ERROR) << "SIO_ADDRESS_LIST_SORT failed " << WSAGetLastError();
} else {
success_ = true;
}
closesocket(sock);
}
// Executed on the calling thread.
void OnComplete() {
std::vector<IPEndPoint> sorted;
if (success_) {
sorted.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 (ipe.address().IsIPv4MappedIPv6()) {
ipe = IPEndPoint(ConvertIPv4MappedIPv6ToIPv4(ipe.address()),
ipe.port());
}
sorted.push_back(ipe);
}
}
std::move(callback_).Run(success_, std::move(sorted));
}
CallbackType callback_;
const DWORD buffer_size_;
std::unique_ptr<SOCKET_ADDRESS_LIST, base::FreeDeleter> input_buffer_;
std::unique_ptr<SOCKET_ADDRESS_LIST, base::FreeDeleter> output_buffer_;
bool success_ = false;
};
};
} // namespace
// static
std::unique_ptr<AddressSorter> AddressSorter::CreateAddressSorter() {
return std::make_unique<AddressSorterWin>();
}
} // namespace net
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