net/tools/quic/quic_server.cc

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "net/tools/quic/quic_server.h"
   6
   7 #include <errno.h>
   8 #include <features.h>
   9 #include <netinet/in.h>
  10 #include <string.h>
  11 #include <sys/epoll.h>
  12 #include <sys/socket.h>
  13
  14 #include "net/base/ip_endpoint.h"
  15 #include "net/quic/congestion_control/tcp_receiver.h"
  16 #include "net/quic/crypto/crypto_handshake.h"
  17 #include "net/quic/crypto/quic_random.h"
  18 #include "net/quic/quic_clock.h"
  19 #include "net/quic/quic_crypto_stream.h"
  20 #include "net/quic/quic_data_reader.h"
  21 #include "net/quic/quic_protocol.h"
  22 #include "net/tools/quic/quic_dispatcher.h"
  23 #include "net/tools/quic/quic_in_memory_cache.h"
  24 #include "net/tools/quic/quic_socket_utils.h"
  25
  26 #define MMSG_MORE 0
  27
  28 #ifndef SO_RXQ_OVFL
  29 #define SO_RXQ_OVFL 40
  30 #endif
  31
  32 namespace net {
  33 namespace tools {
  34
  35 namespace {
  36
  37 const int kEpollFlags = EPOLLIN | EPOLLOUT | EPOLLET;
  38 const char kSourceAddressTokenSecret[] = "secret";
  39 const uint32 kServerInitialFlowControlWindow = 100 * net::kMaxPacketSize;
  40
  41 }  // namespace
  42
  43 QuicServer::QuicServer()
  44     : port_(0),
  45       fd_(-1),
  46       packets_dropped_(0),
  47       overflow_supported_(false),
  48       use_recvmmsg_(false),
  49       crypto_config_(kSourceAddressTokenSecret, QuicRandom::GetInstance()),
  50       supported_versions_(QuicSupportedVersions()) {
  51   Initialize();
  52 }
  53
  54 QuicServer::QuicServer(const QuicConfig& config,
  55                        const QuicVersionVector& supported_versions)
  56     : port_(0),
  57       fd_(-1),
  58       packets_dropped_(0),
  59       overflow_supported_(false),
  60       use_recvmmsg_(false),
  61       config_(config),
  62       crypto_config_(kSourceAddressTokenSecret, QuicRandom::GetInstance()),
  63       supported_versions_(supported_versions) {
  64   Initialize();
  65 }
  66
  67 void QuicServer::Initialize() {
  68 #if MMSG_MORE
  69   use_recvmmsg_ = true;
  70 #endif
  71   epoll_server_.set_timeout_in_us(50 * 1000);
  72   // Initialize the in memory cache now.
  73   QuicInMemoryCache::GetInstance();
  74
  75   QuicEpollClock clock(&epoll_server_);
  76
  77   scoped_ptr<CryptoHandshakeMessage> scfg(
  78       crypto_config_.AddDefaultConfig(
  79           QuicRandom::GetInstance(), &clock,
  80           QuicCryptoServerConfig::ConfigOptions()));
  81
  82   // Set flow control options in the config.
  83   config_.SetInitialCongestionWindowToSend(kServerInitialFlowControlWindow);
  84 }
  85
  86 QuicServer::~QuicServer() {
  87 }
  88
  89 bool QuicServer::Listen(const IPEndPoint& address) {
  90   port_ = address.port();
  91   int address_family = address.GetSockAddrFamily();
  92   fd_ = socket(address_family, SOCK_DGRAM | SOCK_NONBLOCK, IPPROTO_UDP);
  93   if (fd_ < 0) {
  94     LOG(ERROR) << "CreateSocket() failed: " << strerror(errno);
  95     return false;
  96   }
  97
  98   // Enable the socket option that allows the local address to be
  99   // returned if the socket is bound to more than one address.
 100   int rc = QuicSocketUtils::SetGetAddressInfo(fd_, address_family);
 101
 102   if (rc < 0) {
 103     LOG(ERROR) << "IP detection not supported" << strerror(errno);
 104     return false;
 105   }
 106
 107   int get_overflow = 1;
 108   rc = setsockopt(
 109       fd_, SOL_SOCKET, SO_RXQ_OVFL, &get_overflow, sizeof(get_overflow));
 110
 111   if (rc < 0) {
 112     DLOG(WARNING) << "Socket overflow detection not supported";
 113   } else {
 114     overflow_supported_ = true;
 115   }
 116
 117   // These send and receive buffer sizes are sized for a single connection,
 118   // because the default usage of QuicServer is as a test server with one or
 119   // two clients.  Adjust higher for use with many clients.
 120   if (!QuicSocketUtils::SetReceiveBufferSize(fd_,
 121                                              TcpReceiver::kReceiveWindowTCP)) {
 122     return false;
 123   }
 124
 125   if (!QuicSocketUtils::SetSendBufferSize(fd_,
 126                                           TcpReceiver::kReceiveWindowTCP)) {
 127     return false;
 128   }
 129
 130   sockaddr_storage raw_addr;
 131   socklen_t raw_addr_len = sizeof(raw_addr);
 132   CHECK(address.ToSockAddr(reinterpret_cast<sockaddr*>(&raw_addr),
 133                            &raw_addr_len));
 134   rc = bind(fd_,
 135             reinterpret_cast<const sockaddr*>(&raw_addr),
 136             sizeof(raw_addr));
 137   if (rc < 0) {
 138     LOG(ERROR) << "Bind failed: " << strerror(errno);
 139     return false;
 140   }
 141
 142   DVLOG(1) << "Listening on " << address.ToString();
 143   if (port_ == 0) {
 144     SockaddrStorage storage;
 145     IPEndPoint server_address;
 146     if (getsockname(fd_, storage.addr, &storage.addr_len) != 0 ||
 147         !server_address.FromSockAddr(storage.addr, storage.addr_len)) {
 148       LOG(ERROR) << "Unable to get self address.  Error: " << strerror(errno);
 149       return false;
 150     }
 151     port_ = server_address.port();
 152     DVLOG(1) << "Kernel assigned port is " << port_;
 153   }
 154
 155   epoll_server_.RegisterFD(fd_, this, kEpollFlags);
 156   dispatcher_.reset(CreateQuicDispatcher());
 157   dispatcher_->Initialize(fd_);
 158
 159   return true;
 160 }
 161
 162 QuicDispatcher* QuicServer::CreateQuicDispatcher() {
 163   return new QuicDispatcher(
 164       config_,
 165       crypto_config_,
 166       supported_versions_,
 167       new QuicDispatcher::DefaultPacketWriterFactory(),
 168       &epoll_server_);
 169 }
 170
 171 void QuicServer::WaitForEvents() {
 172   epoll_server_.WaitForEventsAndExecuteCallbacks();
 173 }
 174
 175 void QuicServer::Shutdown() {
 176   // Before we shut down the epoll server, give all active sessions a chance to
 177   // notify clients that they're closing.
 178   dispatcher_->Shutdown();
 179
 180   close(fd_);
 181   fd_ = -1;
 182 }
 183
 184 void QuicServer::OnEvent(int fd, EpollEvent* event) {
 185   DCHECK_EQ(fd, fd_);
 186   event->out_ready_mask = 0;
 187
 188   if (event->in_events & EPOLLIN) {
 189     DVLOG(1) << "EPOLLIN";
 190     bool read = true;
 191     while (read) {
 192         read = ReadAndDispatchSinglePacket(
 193             fd_, port_, dispatcher_.get(),
 194             overflow_supported_ ? &packets_dropped_ : nullptr);
 195     }
 196   }
 197   if (event->in_events & EPOLLOUT) {
 198     dispatcher_->OnCanWrite();
 199     if (dispatcher_->HasPendingWrites()) {
 200       event->out_ready_mask |= EPOLLOUT;
 201     }
 202   }
 203   if (event->in_events & EPOLLERR) {
 204   }
 205 }
 206
 207 /* static */
 208 bool QuicServer::ReadAndDispatchSinglePacket(int fd,
 209                                              int port,
 210                                              ProcessPacketInterface* processor,
 211                                              uint32* packets_dropped) {
 212   // Allocate some extra space so we can send an error if the client goes over
 213   // the limit.
 214   char buf[2 * kMaxPacketSize];
 215
 216   IPEndPoint client_address;
 217   IPAddressNumber server_ip;
 218   int bytes_read =
 219       QuicSocketUtils::ReadPacket(fd, buf, arraysize(buf),
 220                                   packets_dropped,
 221                                   &server_ip, &client_address);
 222
 223   if (bytes_read < 0) {
 224     return false;  // We failed to read.
 225   }
 226
 227   QuicEncryptedPacket packet(buf, bytes_read, false);
 228
 229   IPEndPoint server_address(server_ip, port);
 230   processor->ProcessPacket(server_address, client_address, packet);
 231
 232   return true;
 233 }
 234
 235 }  // namespace tools
 236 }  // namespace net