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// Copyright 2014 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/tools/quic/quic_simple_server.h"
#include <string.h>
#include "base/location.h"
#include "base/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/socket/udp_server_socket.h"
#include "net/third_party/quic/core/crypto/crypto_handshake.h"
#include "net/third_party/quic/core/crypto/quic_random.h"
#include "net/third_party/quic/core/quic_crypto_stream.h"
#include "net/third_party/quic/core/quic_data_reader.h"
#include "net/third_party/quic/core/quic_packets.h"
#include "net/third_party/quic/core/tls_server_handshaker.h"
#include "net/third_party/quic/tools/quic_simple_dispatcher.h"
#include "net/tools/quic/quic_simple_per_connection_packet_writer.h"
#include "net/tools/quic/quic_simple_server_packet_writer.h"
#include "net/tools/quic/quic_simple_server_session_helper.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::kMaxPacketSize;
} // 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::TlsServerHandshaker::CreateSslCtx()),
read_pending_(false),
synchronous_read_count_(0),
read_buffer_(new IOBufferWithSize(kReadBufferSize)),
quic_simple_server_backend_(quic_simple_server_backend),
weak_factory_(this) {
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;
int QuicSimpleServer::Listen(const IPEndPoint& address) {
std::unique_ptr<UDPServerSocket> socket(
new UDPServerSocket(&net_log_, NetLogSource()));
socket->AllowAddressReuse();
int rc = socket->Listen(address);
if (rc < 0) {
LOG(ERROR) << "Listen() failed: " << ErrorToString(rc);
return rc;
}
// These send and receive buffer sizes are sized for a single connection,
// because the default usage of QuicSimpleServer is as a test server with
// one or two clients. Adjust higher for use with many clients.
rc = socket->SetReceiveBufferSize(
static_cast<int32_t>(quic::kDefaultSocketReceiveBuffer));
if (rc < 0) {
LOG(ERROR) << "SetReceiveBufferSize() failed: " << ErrorToString(rc);
return rc;
}
rc = socket->SetSendBufferSize(20 * quic::kMaxPacketSize);
if (rc < 0) {
LOG(ERROR) << "SetSendBufferSize() failed: " << ErrorToString(rc);
return rc;
}
rc = socket->GetLocalAddress(&server_address_);
if (rc < 0) {
LOG(ERROR) << "GetLocalAddress() failed: " << ErrorToString(rc);
return rc;
}
DVLOG(1) << "Listening on " << server_address_.ToString();
socket_.swap(socket);
dispatcher_.reset(new quic::QuicSimpleDispatcher(
config_, &crypto_config_, &version_manager_,
std::unique_ptr<quic::QuicConnectionHelperInterface>(helper_),
std::unique_ptr<quic::QuicCryptoServerStream::Helper>(
new QuicSimpleServerSessionHelper(quic::QuicRandom::GetInstance())),
std::unique_ptr<quic::QuicAlarmFactory>(alarm_factory_),
quic_simple_server_backend_));
QuicSimpleServerPacketWriter* writer =
new QuicSimpleServerPacketWriter(socket_.get(), dispatcher_.get());
dispatcher_->InitializeWithWriter(writer);
StartReading();
return OK;
}
void QuicSimpleServer::Shutdown() {
// 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::Bind(&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::Bind(&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::Bind(&QuicSimpleServer::OnReadComplete,
weak_factory_.GetWeakPtr(), result));
} else {
OnReadComplete(result);
}
}
void QuicSimpleServer::OnReadComplete(int result) {
read_pending_ = false;
if (result == 0)
result = ERR_CONNECTION_CLOSED;
if (result < 0) {
LOG(ERROR) << "QuicSimpleServer read failed: " << ErrorToString(result);
Shutdown();
return;
}
quic::QuicReceivedPacket packet(read_buffer_->data(), result,
helper_->GetClock()->Now(), false);
dispatcher_->ProcessPacket(
quic::QuicSocketAddress(quic::QuicSocketAddressImpl(server_address_)),
quic::QuicSocketAddress(quic::QuicSocketAddressImpl(client_address_)),
packet);
StartReading();
}
} // namespace net
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