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// Copyright 2014 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "net/tools/quic/quic_simple_server.h"
#include <string.h>
#include <memory>
#include "base/bind.h"
#include "base/location.h"
#include "base/run_loop.h"
#include "base/task/single_thread_task_runner.h"
#include "base/threading/thread_task_runner_handle.h"
#include "net/base/ip_endpoint.h"
#include "net/base/net_errors.h"
#include "net/log/net_log_source.h"
#include "net/quic/address_utils.h"
#include "net/socket/udp_server_socket.h"
#include "net/third_party/quiche/src/quiche/quic/core/crypto/crypto_handshake.h"
#include "net/third_party/quiche/src/quiche/quic/core/crypto/quic_random.h"
#include "net/third_party/quiche/src/quiche/quic/core/quic_crypto_stream.h"
#include "net/third_party/quiche/src/quiche/quic/core/quic_data_reader.h"
#include "net/third_party/quiche/src/quiche/quic/core/quic_packets.h"
#include "net/third_party/quiche/src/quiche/quic/tools/quic_simple_dispatcher.h"
#include "net/tools/quic/quic_simple_server_packet_writer.h"
#include "net/tools/quic/quic_simple_server_session_helper.h"
#include "net/tools/quic/quic_simple_server_socket.h"
namespace net {
namespace {
const char kSourceAddressTokenSecret[] = "secret";
const size_t kNumSessionsToCreatePerSocketEvent = 16;
// Allocate some extra space so we can send an error if the client goes over
// the limit.
const int kReadBufferSize = 2 * quic::kMaxIncomingPacketSize;
} // namespace
QuicSimpleServer::QuicSimpleServer(
std::unique_ptr<quic::ProofSource> proof_source,
const quic::QuicConfig& config,
const quic::QuicCryptoServerConfig::ConfigOptions& crypto_config_options,
const quic::ParsedQuicVersionVector& supported_versions,
quic::QuicSimpleServerBackend* quic_simple_server_backend)
: version_manager_(supported_versions),
helper_(
new QuicChromiumConnectionHelper(&clock_,
quic::QuicRandom::GetInstance())),
alarm_factory_(new QuicChromiumAlarmFactory(
base::ThreadTaskRunnerHandle::Get().get(),
&clock_)),
config_(config),
crypto_config_options_(crypto_config_options),
crypto_config_(kSourceAddressTokenSecret,
quic::QuicRandom::GetInstance(),
std::move(proof_source),
quic::KeyExchangeSource::Default()),
read_buffer_(base::MakeRefCounted<IOBufferWithSize>(kReadBufferSize)),
quic_simple_server_backend_(quic_simple_server_backend),
connection_id_generator_(quic::kQuicDefaultConnectionIdLength) {
DCHECK(quic_simple_server_backend);
Initialize();
}
void QuicSimpleServer::Initialize() {
#if MMSG_MORE
use_recvmmsg_ = true;
#endif
// If an initial flow control window has not explicitly been set, then use a
// sensible value for a server: 1 MB for session, 64 KB for each stream.
const uint32_t kInitialSessionFlowControlWindow = 1 * 1024 * 1024; // 1 MB
const uint32_t kInitialStreamFlowControlWindow = 64 * 1024; // 64 KB
if (config_.GetInitialStreamFlowControlWindowToSend() ==
quic::kMinimumFlowControlSendWindow) {
config_.SetInitialStreamFlowControlWindowToSend(
kInitialStreamFlowControlWindow);
}
if (config_.GetInitialSessionFlowControlWindowToSend() ==
quic::kMinimumFlowControlSendWindow) {
config_.SetInitialSessionFlowControlWindowToSend(
kInitialSessionFlowControlWindow);
}
std::unique_ptr<quic::CryptoHandshakeMessage> scfg(
crypto_config_.AddDefaultConfig(helper_->GetRandomGenerator(),
helper_->GetClock(),
crypto_config_options_));
}
QuicSimpleServer::~QuicSimpleServer() = default;
bool QuicSimpleServer::CreateUDPSocketAndListen(
const quic::QuicSocketAddress& address) {
return Listen(ToIPEndPoint(address));
}
void QuicSimpleServer::HandleEventsForever() {
base::RunLoop().Run();
}
bool QuicSimpleServer::Listen(const IPEndPoint& address) {
socket_ = CreateQuicSimpleServerSocket(address, &server_address_);
if (socket_ == nullptr)
return false;
dispatcher_ = std::make_unique<quic::QuicSimpleDispatcher>(
&config_, &crypto_config_, &version_manager_,
std::unique_ptr<quic::QuicConnectionHelperInterface>(helper_),
std::make_unique<QuicSimpleServerSessionHelper>(
quic::QuicRandom::GetInstance()),
std::unique_ptr<quic::QuicAlarmFactory>(alarm_factory_),
quic_simple_server_backend_, quic::kQuicDefaultConnectionIdLength,
connection_id_generator_);
QuicSimpleServerPacketWriter* writer =
new QuicSimpleServerPacketWriter(socket_.get(), dispatcher_.get());
dispatcher_->InitializeWithWriter(writer);
StartReading();
return true;
}
void QuicSimpleServer::Shutdown() {
DVLOG(1) << "QuicSimpleServer is shutting down";
// Before we shut down the epoll server, give all active sessions a chance to
// notify clients that they're closing.
dispatcher_->Shutdown();
if (!socket_) {
return;
}
socket_->Close();
socket_.reset();
}
void QuicSimpleServer::StartReading() {
if (synchronous_read_count_ == 0) {
// Only process buffered packets once per message loop.
dispatcher_->ProcessBufferedChlos(kNumSessionsToCreatePerSocketEvent);
}
if (read_pending_) {
return;
}
read_pending_ = true;
int result = socket_->RecvFrom(
read_buffer_.get(), read_buffer_->size(), &client_address_,
base::BindOnce(&QuicSimpleServer::OnReadComplete,
base::Unretained(this)));
if (result == ERR_IO_PENDING) {
synchronous_read_count_ = 0;
if (dispatcher_->HasChlosBuffered()) {
// No more packets to read, so yield before processing buffered packets.
base::ThreadTaskRunnerHandle::Get()->PostTask(
FROM_HERE, base::BindOnce(&QuicSimpleServer::StartReading,
weak_factory_.GetWeakPtr()));
}
return;
}
if (++synchronous_read_count_ > 32) {
synchronous_read_count_ = 0;
// Schedule the processing through the message loop to 1) prevent infinite
// recursion and 2) avoid blocking the thread for too long.
base::ThreadTaskRunnerHandle::Get()->PostTask(
FROM_HERE, base::BindOnce(&QuicSimpleServer::OnReadComplete,
weak_factory_.GetWeakPtr(), result));
} else {
OnReadComplete(result);
}
}
void QuicSimpleServer::OnReadComplete(int result) {
read_pending_ = false;
if (result > 0) {
quic::QuicReceivedPacket packet(read_buffer_->data(), result,
helper_->GetClock()->Now(), false);
dispatcher_->ProcessPacket(ToQuicSocketAddress(server_address_),
ToQuicSocketAddress(client_address_), packet);
} else {
LOG(ERROR) << "QuicSimpleServer read failed: " << ErrorToString(result);
// Do not act on ERR_MSG_TOO_BIG as that indicates that we received a UDP
// packet whose payload is larger than our receive buffer. Do not act on 0
// as that indicates that we received a UDP packet with an empty payload.
// In both cases, the socket should still be usable.
// Also do not act on ERR_CONNECTION_RESET as this is happening when the
// network service restarts on Windows.
if (result != ERR_MSG_TOO_BIG && result != ERR_CONNECTION_RESET &&
result != 0) {
Shutdown();
return;
}
}
StartReading();
}
} // namespace net
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