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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 "net/base/ip_endpoint.h"
#include "net/base/sockaddr_storage.h"
#include "net/quic/crypto/crypto_handshake.h"
#include "net/quic/crypto/quic_random.h"
#include "net/quic/quic_clock.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_epoll_clock.h"
#include "net/tools/quic/quic_epoll_connection_helper.h"
#include "net/tools/quic/quic_in_memory_cache.h"
#include "net/tools/quic/quic_packet_reader.h"
#include "net/tools/quic/quic_socket_utils.h"
#ifndef SO_RXQ_OVFL
#define SO_RXQ_OVFL 40
#endif
namespace net {
namespace {
// Specifies the directory used during QuicInMemoryCache
// construction to seed the cache. Cache directory can be
// generated using `wget -p --save-headers <url>`
std::string FLAGS_quic_in_memory_cache_dir = "";
const int kEpollFlags = EPOLLIN | EPOLLOUT | EPOLLET;
const char kSourceAddressTokenSecret[] = "secret";
} // namespace
QuicServer::QuicServer(ProofSource* proof_source)
: QuicServer(proof_source,
QuicConfig(),
QuicCryptoServerConfig::ConfigOptions(),
QuicSupportedVersions()) {}
QuicServer::QuicServer(
ProofSource* proof_source,
const QuicConfig& config,
const QuicCryptoServerConfig::ConfigOptions& crypto_config_options,
const QuicVersionVector& supported_versions)
: port_(0),
fd_(-1),
packets_dropped_(0),
overflow_supported_(false),
config_(config),
crypto_config_(kSourceAddressTokenSecret,
QuicRandom::GetInstance(),
proof_source),
crypto_config_options_(crypto_config_options),
supported_versions_(supported_versions),
packet_reader_(new QuicPacketReader()) {
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_in_memory_cache_dir.empty()) {
QuicInMemoryCache::GetInstance()->InitializeFromDirectory(
FLAGS_quic_in_memory_cache_dir);
}
QuicEpollClock clock(&epoll_server_);
scoped_ptr<CryptoHandshakeMessage> scfg(crypto_config_.AddDefaultConfig(
QuicRandom::GetInstance(), &clock, crypto_config_options_));
}
QuicServer::~QuicServer() {}
bool QuicServer::CreateUDPSocketAndListen(const IPEndPoint& address) {
fd_ = QuicSocketUtils::CreateUDPSocket(address, &overflow_supported_);
if (fd_ < 0) {
LOG(ERROR) << "CreateSocket() failed: " << strerror(errno);
return false;
}
sockaddr_storage raw_addr;
socklen_t raw_addr_len = sizeof(raw_addr);
CHECK(address.ToSockAddr(reinterpret_cast<sockaddr*>(&raw_addr),
&raw_addr_len));
int rc =
bind(fd_, reinterpret_cast<const sockaddr*>(&raw_addr), sizeof(raw_addr));
if (rc < 0) {
LOG(ERROR) << "Bind failed: " << strerror(errno);
return false;
}
DVLOG(1) << "Listening on " << address.ToString();
if (port_ == 0) {
SockaddrStorage storage;
IPEndPoint server_address;
if (getsockname(fd_, storage.addr, &storage.addr_len) != 0 ||
!server_address.FromSockAddr(storage.addr, storage.addr_len)) {
LOG(ERROR) << "Unable to get self address. Error: " << strerror(errno);
return false;
}
port_ = server_address.port();
DVLOG(1) << "Kernel assigned port is " << 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() {
return new QuicDispatcher(config_, &crypto_config_, supported_versions_,
new QuicEpollConnectionHelper(
&epoll_server_, QuicAllocator::BUFFER_POOL));
}
void QuicServer::WaitForEvents() {
epoll_server_.WaitForEventsAndExecuteCallbacks();
}
void QuicServer::Shutdown() {
// 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) {
DVLOG(1) << "EPOLLIN";
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 (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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