net/tools/quic/quic_client.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_client.h"
   6
   7 #include <errno.h>
   8 #include <netinet/in.h>
   9 #include <string.h>
  10 #include <sys/epoll.h>
  11 #include <sys/socket.h>
  12 #include <unistd.h>
  13
  14 #include "base/logging.h"
  15 #include "net/quic/congestion_control/tcp_receiver.h"
  16 #include "net/quic/crypto/quic_random.h"
  17 #include "net/quic/quic_connection.h"
  18 #include "net/quic/quic_data_reader.h"
  19 #include "net/quic/quic_protocol.h"
  20 #include "net/quic/quic_server_id.h"
  21 #include "net/tools/balsa/balsa_headers.h"
  22 #include "net/tools/epoll_server/epoll_server.h"
  23 #include "net/tools/quic/quic_epoll_connection_helper.h"
  24 #include "net/tools/quic/quic_socket_utils.h"
  25 #include "net/tools/quic/quic_spdy_client_stream.h"
  26
  27 #ifndef SO_RXQ_OVFL
  28 #define SO_RXQ_OVFL 40
  29 #endif
  30
  31 namespace net {
  32 namespace tools {
  33
  34 const int kEpollFlags = EPOLLIN | EPOLLOUT | EPOLLET;
  35
  36 QuicClient::QuicClient(IPEndPoint server_address,
  37                        const QuicServerId& server_id,
  38                        const QuicVersionVector& supported_versions,
  39                        bool print_response,
  40                        EpollServer* epoll_server)
  41     : server_address_(server_address),
  42       server_id_(server_id),
  43       local_port_(0),
  44       epoll_server_(epoll_server),
  45       fd_(-1),
  46       helper_(CreateQuicConnectionHelper()),
  47       initialized_(false),
  48       packets_dropped_(0),
  49       overflow_supported_(false),
  50       supported_versions_(supported_versions),
  51       print_response_(print_response) {
  52 }
  53
  54 QuicClient::QuicClient(IPEndPoint server_address,
  55                        const QuicServerId& server_id,
  56                        const QuicVersionVector& supported_versions,
  57                        bool print_response,
  58                        const QuicConfig& config,
  59                        EpollServer* epoll_server)
  60     : server_address_(server_address),
  61       server_id_(server_id),
  62       config_(config),
  63       local_port_(0),
  64       epoll_server_(epoll_server),
  65       fd_(-1),
  66       helper_(CreateQuicConnectionHelper()),
  67       initialized_(false),
  68       packets_dropped_(0),
  69       overflow_supported_(false),
  70       supported_versions_(supported_versions),
  71       print_response_(print_response) {
  72 }
  73
  74 QuicClient::~QuicClient() {
  75   if (connected()) {
  76     session()->connection()->SendConnectionClosePacket(
  77         QUIC_PEER_GOING_AWAY, "");
  78   }
  79   if (fd_ > 0) {
  80     epoll_server_->UnregisterFD(fd_);
  81   }
  82 }
  83
  84 bool QuicClient::Initialize() {
  85   DCHECK(!initialized_);
  86
  87   epoll_server_->set_timeout_in_us(50 * 1000);
  88
  89   if (!CreateUDPSocket()) {
  90     return false;
  91   }
  92
  93   epoll_server_->RegisterFD(fd_, this, kEpollFlags);
  94   initialized_ = true;
  95   return true;
  96 }
  97
  98 QuicClient::DummyPacketWriterFactory::DummyPacketWriterFactory(
  99     QuicPacketWriter* writer)
 100     : writer_(writer) {}
 101
 102 QuicClient::DummyPacketWriterFactory::~DummyPacketWriterFactory() {}
 103
 104 QuicPacketWriter* QuicClient::DummyPacketWriterFactory::Create(
 105     QuicConnection* /*connection*/) const {
 106   return writer_;
 107 }
 108
 109
 110 bool QuicClient::CreateUDPSocket() {
 111   int address_family = server_address_.GetSockAddrFamily();
 112   fd_ = socket(address_family, SOCK_DGRAM | SOCK_NONBLOCK, IPPROTO_UDP);
 113   if (fd_ < 0) {
 114     LOG(ERROR) << "CreateSocket() failed: " << strerror(errno);
 115     return false;
 116   }
 117
 118   int get_overflow = 1;
 119   int rc = setsockopt(fd_, SOL_SOCKET, SO_RXQ_OVFL, &get_overflow,
 120                       sizeof(get_overflow));
 121   if (rc < 0) {
 122     DLOG(WARNING) << "Socket overflow detection not supported";
 123   } else {
 124     overflow_supported_ = true;
 125   }
 126
 127   if (!QuicSocketUtils::SetReceiveBufferSize(fd_,
 128                                              TcpReceiver::kReceiveWindowTCP)) {
 129     return false;
 130   }
 131
 132   if (!QuicSocketUtils::SetSendBufferSize(fd_,
 133                                           TcpReceiver::kReceiveWindowTCP)) {
 134     return false;
 135   }
 136
 137   rc = QuicSocketUtils::SetGetAddressInfo(fd_, address_family);
 138   if (rc < 0) {
 139     LOG(ERROR) << "IP detection not supported" << strerror(errno);
 140     return false;
 141   }
 142
 143   if (bind_to_address_.size() != 0) {
 144     client_address_ = IPEndPoint(bind_to_address_, local_port_);
 145   } else if (address_family == AF_INET) {
 146     IPAddressNumber any4;
 147     CHECK(net::ParseIPLiteralToNumber("0.0.0.0", &any4));
 148     client_address_ = IPEndPoint(any4, local_port_);
 149   } else {
 150     IPAddressNumber any6;
 151     CHECK(net::ParseIPLiteralToNumber("::", &any6));
 152     client_address_ = IPEndPoint(any6, local_port_);
 153   }
 154
 155   sockaddr_storage raw_addr;
 156   socklen_t raw_addr_len = sizeof(raw_addr);
 157   CHECK(client_address_.ToSockAddr(reinterpret_cast<sockaddr*>(&raw_addr),
 158                            &raw_addr_len));
 159   rc = bind(fd_,
 160             reinterpret_cast<const sockaddr*>(&raw_addr),
 161             sizeof(raw_addr));
 162   if (rc < 0) {
 163     LOG(ERROR) << "Bind failed: " << strerror(errno);
 164     return false;
 165   }
 166
 167   SockaddrStorage storage;
 168   if (getsockname(fd_, storage.addr, &storage.addr_len) != 0 ||
 169       !client_address_.FromSockAddr(storage.addr, storage.addr_len)) {
 170     LOG(ERROR) << "Unable to get self address.  Error: " << strerror(errno);
 171   }
 172
 173   return true;
 174 }
 175
 176 bool QuicClient::Connect() {
 177   if (!StartConnect()) {
 178     return false;
 179   }
 180   while (EncryptionBeingEstablished()) {
 181     WaitForEvents();
 182   }
 183   return session_->connection()->connected();
 184 }
 185
 186 bool QuicClient::StartConnect() {
 187   DCHECK(initialized_);
 188   DCHECK(!connected());
 189
 190   QuicPacketWriter* writer = CreateQuicPacketWriter();
 191
 192   DummyPacketWriterFactory factory(writer);
 193
 194   session_.reset(new QuicClientSession(
 195       config_,
 196       new QuicConnection(GenerateConnectionId(),
 197                          server_address_,
 198                          helper_.get(),
 199                          factory,
 200                          /* owns_writer= */ false,
 201                          /* is_server= */ false,
 202                          supported_versions_)));
 203
 204   // Reset |writer_| after |session_| so that the old writer outlives the old
 205   // session.
 206   if (writer_.get() != writer) {
 207     writer_.reset(writer);
 208   }
 209   session_->InitializeSession(server_id_, &crypto_config_);
 210   return session_->CryptoConnect();
 211 }
 212
 213 bool QuicClient::EncryptionBeingEstablished() {
 214   return !session_->IsEncryptionEstablished() &&
 215       session_->connection()->connected();
 216 }
 217
 218 void QuicClient::Disconnect() {
 219   DCHECK(initialized_);
 220
 221   if (connected()) {
 222     session()->connection()->SendConnectionClose(QUIC_PEER_GOING_AWAY);
 223   }
 224   epoll_server_->UnregisterFD(fd_);
 225   close(fd_);
 226   fd_ = -1;
 227   initialized_ = false;
 228 }
 229
 230 void QuicClient::SendRequestsAndWaitForResponse(
 231     const base::CommandLine::StringVector& args) {
 232   for (size_t i = 0; i < args.size(); ++i) {
 233     BalsaHeaders headers;
 234     headers.SetRequestFirstlineFromStringPieces("GET", args[i], "HTTP/1.1");
 235     QuicSpdyClientStream* stream = CreateReliableClientStream();
 236     DCHECK(stream != nullptr);
 237     stream->SendRequest(headers, "", true);
 238     stream->set_visitor(this);
 239   }
 240
 241   while (WaitForEvents()) {}
 242 }
 243
 244 QuicSpdyClientStream* QuicClient::CreateReliableClientStream() {
 245   if (!connected()) {
 246     return nullptr;
 247   }
 248
 249   return session_->CreateOutgoingDataStream();
 250 }
 251
 252 void QuicClient::WaitForStreamToClose(QuicStreamId id) {
 253   DCHECK(connected());
 254
 255   while (connected() && !session_->IsClosedStream(id)) {
 256     epoll_server_->WaitForEventsAndExecuteCallbacks();
 257   }
 258 }
 259
 260 void QuicClient::WaitForCryptoHandshakeConfirmed() {
 261   DCHECK(connected());
 262
 263   while (connected() && !session_->IsCryptoHandshakeConfirmed()) {
 264     epoll_server_->WaitForEventsAndExecuteCallbacks();
 265   }
 266 }
 267
 268 bool QuicClient::WaitForEvents() {
 269   DCHECK(connected());
 270
 271   epoll_server_->WaitForEventsAndExecuteCallbacks();
 272   return session_->num_active_requests() != 0;
 273 }
 274
 275 void QuicClient::OnEvent(int fd, EpollEvent* event) {
 276   DCHECK_EQ(fd, fd_);
 277
 278   if (event->in_events & EPOLLIN) {
 279     while (connected() && ReadAndProcessPacket()) {
 280     }
 281   }
 282   if (connected() && (event->in_events & EPOLLOUT)) {
 283     writer_->SetWritable();
 284     session_->connection()->OnCanWrite();
 285   }
 286   if (event->in_events & EPOLLERR) {
 287     DVLOG(1) << "Epollerr";
 288   }
 289 }
 290
 291 void QuicClient::OnClose(QuicDataStream* stream) {
 292   QuicSpdyClientStream* client_stream =
 293       static_cast<QuicSpdyClientStream*>(stream);
 294   if (response_listener_.get() != nullptr) {
 295     response_listener_->OnCompleteResponse(
 296         stream->id(), client_stream->headers(), client_stream->data());
 297   }
 298
 299   if (!print_response_) {
 300     return;
 301   }
 302
 303   const BalsaHeaders& headers = client_stream->headers();
 304   printf("%s\n", headers.first_line().as_string().c_str());
 305   for (BalsaHeaders::const_header_lines_iterator i =
 306            headers.header_lines_begin();
 307        i != headers.header_lines_end(); ++i) {
 308     printf("%s: %s\n", i->first.as_string().c_str(),
 309            i->second.as_string().c_str());
 310   }
 311   printf("%s\n", client_stream->data().c_str());
 312 }
 313
 314 bool QuicClient::connected() const {
 315   return session_.get() && session_->connection() &&
 316       session_->connection()->connected();
 317 }
 318
 319 QuicConnectionId QuicClient::GenerateConnectionId() {
 320   return QuicRandom::GetInstance()->RandUint64();
 321 }
 322
 323 QuicEpollConnectionHelper* QuicClient::CreateQuicConnectionHelper() {
 324   return new QuicEpollConnectionHelper(epoll_server_);
 325 }
 326
 327 QuicPacketWriter* QuicClient::CreateQuicPacketWriter() {
 328   return new QuicDefaultPacketWriter(fd_);
 329 }
 330
 331 int QuicClient::ReadPacket(char* buffer,
 332                            int buffer_len,
 333                            IPEndPoint* server_address,
 334                            IPAddressNumber* client_ip) {
 335   return QuicSocketUtils::ReadPacket(
 336       fd_, buffer, buffer_len,
 337       overflow_supported_ ? &packets_dropped_ : nullptr, client_ip,
 338       server_address);
 339 }
 340
 341 bool QuicClient::ReadAndProcessPacket() {
 342   // Allocate some extra space so we can send an error if the server goes over
 343   // the limit.
 344   char buf[2 * kMaxPacketSize];
 345
 346   IPEndPoint server_address;
 347   IPAddressNumber client_ip;
 348
 349   int bytes_read = ReadPacket(buf, arraysize(buf), &server_address, &client_ip);
 350
 351   if (bytes_read < 0) {
 352     return false;
 353   }
 354
 355   QuicEncryptedPacket packet(buf, bytes_read, false);
 356
 357   IPEndPoint client_address(client_ip, client_address_.port());
 358   session_->connection()->ProcessUdpPacket(
 359       client_address, server_address, packet);
 360   return true;
 361 }
 362
 363 }  // namespace tools
 364 }  // namespace net