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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/thread_task_runner_handle.h"
#include "net/base/ip_endpoint.h"
#include "net/base/net_errors.h"
#include "net/quic/crypto/crypto_handshake.h"
#include "net/quic/crypto/quic_random.h"
#include "net/quic/quic_crypto_stream.h"
#include "net/quic/quic_data_reader.h"
#include "net/quic/quic_protocol.h"
#include "net/tools/quic/quic_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/udp/udp_server_socket.h"
namespace net {
namespace {
const char kSourceAddressTokenSecret[] = "secret";
// Allocate some extra space so we can send an error if the client goes over
// the limit.
const int kReadBufferSize = 2 * kMaxPacketSize;
class SimpleQuicDispatcher : public QuicDispatcher {
public:
SimpleQuicDispatcher(const QuicConfig& config,
const QuicCryptoServerConfig* crypto_config,
const QuicVersionVector& supported_versions,
QuicConnectionHelperInterface* helper)
: QuicDispatcher(config, crypto_config, supported_versions, helper) {}
protected:
QuicServerSessionBase* CreateQuicSession(
QuicConnectionId connection_id,
const IPEndPoint& client_address) override {
QuicServerSessionBase* session =
QuicDispatcher::CreateQuicSession(connection_id, client_address);
static_cast<QuicSimplePerConnectionPacketWriter*>(
session->connection()->writer())
->set_connection(session->connection());
return session;
}
QuicPacketWriter* CreatePerConnectionWriter() override {
return new QuicSimplePerConnectionPacketWriter(
static_cast<QuicSimpleServerPacketWriter*>(writer()));
}
};
} // namespace
QuicSimpleServer::QuicSimpleServer(ProofSource* proof_source,
const QuicConfig& config,
const QuicVersionVector& supported_versions)
: helper_(
new QuicChromiumConnectionHelper(base::ThreadTaskRunnerHandle::Get()
.get(),
&clock_,
QuicRandom::GetInstance())),
config_(config),
crypto_config_(kSourceAddressTokenSecret,
QuicRandom::GetInstance(),
proof_source),
supported_versions_(supported_versions),
read_pending_(false),
synchronous_read_count_(0),
read_buffer_(new IOBufferWithSize(kReadBufferSize)),
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() ==
kMinimumFlowControlSendWindow) {
config_.SetInitialStreamFlowControlWindowToSend(
kInitialStreamFlowControlWindow);
}
if (config_.GetInitialSessionFlowControlWindowToSend() ==
kMinimumFlowControlSendWindow) {
config_.SetInitialSessionFlowControlWindowToSend(
kInitialSessionFlowControlWindow);
}
scoped_ptr<CryptoHandshakeMessage> scfg(crypto_config_.AddDefaultConfig(
helper_->GetRandomGenerator(), helper_->GetClock(),
QuicCryptoServerConfig::ConfigOptions()));
}
QuicSimpleServer::~QuicSimpleServer() {}
int QuicSimpleServer::Listen(const IPEndPoint& address) {
scoped_ptr<UDPServerSocket> socket(
new UDPServerSocket(&net_log_, NetLog::Source()));
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>(kDefaultSocketReceiveBuffer));
if (rc < 0) {
LOG(ERROR) << "SetReceiveBufferSize() failed: " << ErrorToString(rc);
return rc;
}
rc = socket->SetSendBufferSize(20 * 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 SimpleQuicDispatcher(config_, &crypto_config_,
supported_versions_, helper_));
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();
socket_->Close();
socket_.reset();
}
void QuicSimpleServer::StartReading() {
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;
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;
}
QuicEncryptedPacket packet(read_buffer_->data(), result, false);
dispatcher_->ProcessPacket(server_address_, client_address_, packet);
StartReading();
}
} // namespace net
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