src/net/quic/quic_server.cc

   1 // Copyright 2014 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/quic/quic_server.h"
   6
   7 #include <string.h>
   8
   9 #include "net/base/ip_endpoint.h"
  10 #include "net/base/net_errors.h"
  11 #include "net/quic/congestion_control/tcp_receiver.h"
  12 #include "net/quic/crypto/crypto_handshake.h"
  13 #include "net/quic/crypto/quic_random.h"
  14 #include "net/quic/quic_crypto_stream.h"
  15 #include "net/quic/quic_data_reader.h"
  16 #include "net/quic/quic_dispatcher.h"
  17 #include "net/quic/quic_in_memory_cache.h"
  18 #include "net/quic/quic_protocol.h"
  19 #include "net/quic/quic_server_packet_writer.h"
  20 #include "net/udp/udp_server_socket.h"
  21
  22 namespace net {
  23
  24 namespace {
  25
  26 const char kSourceAddressTokenSecret[] = "secret";
  27
  28 // Allocate some extra space so we can send an error if the client goes over
  29 // the limit.
  30 const int kReadBufferSize = 2 * kMaxPacketSize;
  31
  32 } // namespace
  33
  34 QuicServer::QuicServer(const QuicConfig& config,
  35                        const QuicVersionVector& supported_versions)
  36     : helper_(base::MessageLoop::current()->message_loop_proxy().get(),
  37               &clock_,
  38               QuicRandom::GetInstance()),
  39       config_(config),
  40       crypto_config_(kSourceAddressTokenSecret, QuicRandom::GetInstance()),
  41       supported_versions_(supported_versions),
  42       read_pending_(false),
  43       synchronous_read_count_(0),
  44       read_buffer_(new IOBufferWithSize(kReadBufferSize)),
  45       weak_factory_(this) {
  46   Initialize();
  47 }
  48
  49 void QuicServer::Initialize() {
  50   // Initialize the in memory cache now.
  51   QuicInMemoryCache::GetInstance();
  52
  53   scoped_ptr<CryptoHandshakeMessage> scfg(
  54       crypto_config_.AddDefaultConfig(
  55           helper_.GetRandomGenerator(), helper_.GetClock(),
  56           QuicCryptoServerConfig::ConfigOptions()));
  57 }
  58
  59 QuicServer::~QuicServer() {
  60 }
  61
  62 int QuicServer::Listen(const IPEndPoint& address) {
  63   scoped_ptr<UDPServerSocket> socket(
  64       new UDPServerSocket(&net_log_, NetLog::Source()));
  65
  66   socket->AllowAddressReuse();
  67
  68   int rc = socket->Listen(address);
  69   if (rc < 0) {
  70     LOG(ERROR) << "Listen() failed: " << ErrorToString(rc);
  71     return rc;
  72   }
  73
  74   // These send and receive buffer sizes are sized for a single connection,
  75   // because the default usage of QuicServer is as a test server with one or
  76   // two clients.  Adjust higher for use with many clients.
  77   rc = socket->SetReceiveBufferSize(TcpReceiver::kReceiveWindowTCP);
  78   if (rc < 0) {
  79     LOG(ERROR) << "SetReceiveBufferSize() failed: " << ErrorToString(rc);
  80     return rc;
  81   }
  82
  83   rc = socket->SetSendBufferSize(20 * kMaxPacketSize);
  84   if (rc < 0) {
  85     LOG(ERROR) << "SetSendBufferSize() failed: " << ErrorToString(rc);
  86     return rc;
  87   }
  88
  89   rc = socket->GetLocalAddress(&server_address_);
  90   if (rc < 0) {
  91     LOG(ERROR) << "GetLocalAddress() failed: " << ErrorToString(rc);
  92     return rc;
  93   }
  94
  95   DVLOG(1) << "Listening on " << server_address_.ToString();
  96
  97   socket_.swap(socket);
  98
  99   dispatcher_.reset(
 100       new QuicDispatcher(config_,
 101                          crypto_config_,
 102                          supported_versions_,
 103                          new QuicDispatcher::DefaultPacketWriterFactory(),
 104                          &helper_));
 105   QuicServerPacketWriter* writer = new QuicServerPacketWriter(
 106       socket_.get(),
 107       dispatcher_.get());
 108   dispatcher_->Initialize(writer);
 109
 110   StartReading();
 111
 112   return OK;
 113 }
 114
 115 void QuicServer::Shutdown() {
 116   // Before we shut down the epoll server, give all active sessions a chance to
 117   // notify clients that they're closing.
 118   dispatcher_->Shutdown();
 119
 120   socket_->Close();
 121   socket_.reset();
 122 }
 123
 124 void QuicServer::StartReading() {
 125   if (read_pending_) {
 126     return;
 127   }
 128   read_pending_ = true;
 129
 130   int result = socket_->RecvFrom(
 131       read_buffer_.get(),
 132       read_buffer_->size(),
 133       &client_address_,
 134       base::Bind(&QuicServer::OnReadComplete, base::Unretained(this)));
 135
 136   if (result == ERR_IO_PENDING) {
 137     synchronous_read_count_ = 0;
 138     return;
 139   }
 140
 141   if (++synchronous_read_count_ > 32) {
 142     synchronous_read_count_ = 0;
 143     // Schedule the processing through the message loop to 1) prevent infinite
 144     // recursion and 2) avoid blocking the thread for too long.
 145     base::MessageLoop::current()->PostTask(
 146         FROM_HERE,
 147         base::Bind(&QuicServer::OnReadComplete,
 148                    weak_factory_.GetWeakPtr(),
 149                    result));
 150   } else {
 151     OnReadComplete(result);
 152   }
 153 }
 154
 155 void QuicServer::OnReadComplete(int result) {
 156   read_pending_ = false;
 157   if (result == 0)
 158     result = ERR_CONNECTION_CLOSED;
 159
 160   if (result < 0) {
 161     LOG(ERROR) << "QuicServer read failed: " << ErrorToString(result);
 162     Shutdown();
 163     return;
 164   }
 165
 166   QuicEncryptedPacket packet(read_buffer_->data(), result, false);
 167   dispatcher_->ProcessPacket(server_address_, client_address_, packet);
 168
 169   StartReading();
 170 }
 171
 172 }  // namespace net