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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/tools/quic/quic_server.h"
#include <errno.h>
#include <features.h>
#include <netinet/in.h>
#include <string.h>
#include <sys/epoll.h>
#include <sys/socket.h>
#include <memory>
#include "net/quic/core/crypto/crypto_handshake.h"
#include "net/quic/core/crypto/quic_random.h"
#include "net/quic/core/quic_crypto_stream.h"
#include "net/quic/core/quic_data_reader.h"
#include "net/quic/core/quic_packets.h"
#include "net/quic/platform/api/quic_clock.h"
#include "net/quic/platform/api/quic_flags.h"
#include "net/quic/platform/api/quic_logging.h"
#include "net/tools/quic/platform/impl/quic_epoll_clock.h"
#include "net/tools/quic/platform/impl/quic_socket_utils.h"
#include "net/tools/quic/quic_dispatcher.h"
#include "net/tools/quic/quic_epoll_alarm_factory.h"
#include "net/tools/quic/quic_epoll_connection_helper.h"
#include "net/tools/quic/quic_http_response_cache.h"
#include "net/tools/quic/quic_packet_reader.h"
#include "net/tools/quic/quic_simple_crypto_server_stream_helper.h"
#include "net/tools/quic/quic_simple_dispatcher.h"
#ifndef SO_RXQ_OVFL
#define SO_RXQ_OVFL 40
#endif
namespace net {
namespace {
// Specifies the directory used during QuicHttpResponseCache
// construction to seed the cache. Cache directory can be
// generated using `wget -p --save-headers <url>`
std::string FLAGS_quic_response_cache_dir = "";
const int kEpollFlags = EPOLLIN | EPOLLOUT | EPOLLET;
const char kSourceAddressTokenSecret[] = "secret";
} // namespace
const size_t kNumSessionsToCreatePerSocketEvent = 16;
QuicServer::QuicServer(std::unique_ptr<ProofSource> proof_source,
QuicHttpResponseCache* response_cache)
: QuicServer(std::move(proof_source),
QuicConfig(),
QuicCryptoServerConfig::ConfigOptions(),
AllSupportedVersions(),
response_cache) {}
QuicServer::QuicServer(
std::unique_ptr<ProofSource> proof_source,
const QuicConfig& config,
const QuicCryptoServerConfig::ConfigOptions& crypto_config_options,
const QuicVersionVector& supported_versions,
QuicHttpResponseCache* response_cache)
: port_(0),
fd_(-1),
packets_dropped_(0),
overflow_supported_(false),
silent_close_(false),
config_(config),
crypto_config_(kSourceAddressTokenSecret,
QuicRandom::GetInstance(),
std::move(proof_source)),
crypto_config_options_(crypto_config_options),
version_manager_(supported_versions),
packet_reader_(new QuicPacketReader()),
response_cache_(response_cache) {
Initialize();
}
void QuicServer::Initialize() {
// 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);
}
epoll_server_.set_timeout_in_us(50 * 1000);
if (!FLAGS_quic_response_cache_dir.empty()) {
response_cache_->InitializeFromDirectory(FLAGS_quic_response_cache_dir);
}
QuicEpollClock clock(&epoll_server_);
std::unique_ptr<CryptoHandshakeMessage> scfg(crypto_config_.AddDefaultConfig(
QuicRandom::GetInstance(), &clock, crypto_config_options_));
}
QuicServer::~QuicServer() {}
bool QuicServer::CreateUDPSocketAndListen(const QuicSocketAddress& address) {
fd_ = QuicSocketUtils::CreateUDPSocket(address, &overflow_supported_);
if (fd_ < 0) {
QUIC_LOG(ERROR) << "CreateSocket() failed: " << strerror(errno);
return false;
}
sockaddr_storage addr = address.generic_address();
int rc = bind(fd_, reinterpret_cast<sockaddr*>(&addr), sizeof(addr));
if (rc < 0) {
QUIC_LOG(ERROR) << "Bind failed: " << strerror(errno);
return false;
}
QUIC_LOG(INFO) << "Listening on " << address.ToString();
port_ = address.port();
if (port_ == 0) {
QuicSocketAddress address;
if (address.FromSocket(fd_) != 0) {
QUIC_LOG(ERROR) << "Unable to get self address. Error: "
<< strerror(errno);
}
port_ = address.port();
}
epoll_server_.RegisterFD(fd_, this, kEpollFlags);
dispatcher_.reset(CreateQuicDispatcher());
dispatcher_->InitializeWithWriter(CreateWriter(fd_));
return true;
}
QuicDefaultPacketWriter* QuicServer::CreateWriter(int fd) {
return new QuicDefaultPacketWriter(fd);
}
QuicDispatcher* QuicServer::CreateQuicDispatcher() {
QuicEpollAlarmFactory alarm_factory(&epoll_server_);
return new QuicSimpleDispatcher(
config_, &crypto_config_, &version_manager_,
std::unique_ptr<QuicEpollConnectionHelper>(new QuicEpollConnectionHelper(
&epoll_server_, QuicAllocator::BUFFER_POOL)),
std::unique_ptr<QuicCryptoServerStream::Helper>(
new QuicSimpleCryptoServerStreamHelper(QuicRandom::GetInstance())),
std::unique_ptr<QuicEpollAlarmFactory>(
new QuicEpollAlarmFactory(&epoll_server_)),
response_cache_);
}
void QuicServer::WaitForEvents() {
epoll_server_.WaitForEventsAndExecuteCallbacks();
}
void QuicServer::Shutdown() {
if (!silent_close_) {
// Before we shut down the epoll server, give all active sessions a chance
// to notify clients that they're closing.
dispatcher_->Shutdown();
}
close(fd_);
fd_ = -1;
}
void QuicServer::OnEvent(int fd, EpollEvent* event) {
DCHECK_EQ(fd, fd_);
event->out_ready_mask = 0;
if (event->in_events & EPOLLIN) {
QUIC_DVLOG(1) << "EPOLLIN";
if (FLAGS_quic_reloadable_flag_quic_limit_num_new_sessions_per_epoll_loop) {
dispatcher_->ProcessBufferedChlos(kNumSessionsToCreatePerSocketEvent);
}
bool more_to_read = true;
while (more_to_read) {
more_to_read = packet_reader_->ReadAndDispatchPackets(
fd_, port_, QuicEpollClock(&epoll_server_), dispatcher_.get(),
overflow_supported_ ? &packets_dropped_ : nullptr);
}
if (FLAGS_quic_reloadable_flag_quic_limit_num_new_sessions_per_epoll_loop &&
dispatcher_->HasChlosBuffered()) {
// Register EPOLLIN event to consume buffered CHLO(s).
event->out_ready_mask |= EPOLLIN;
}
}
if (event->in_events & EPOLLOUT) {
dispatcher_->OnCanWrite();
if (dispatcher_->HasPendingWrites()) {
event->out_ready_mask |= EPOLLOUT;
}
}
if (event->in_events & EPOLLERR) {
}
}
} // namespace net
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