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