src/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       server_id_.is_https()));
 204
 205   // Reset |writer_| after |session_| so that the old writer outlives the old
 206   // session.
 207   if (writer_.get() != writer) {
 208     writer_.reset(writer);
 209   }
 210   session_->InitializeSession(server_id_, &crypto_config_);
 211   return session_->CryptoConnect();
 212 }
 213
 214 bool QuicClient::EncryptionBeingEstablished() {
 215   return !session_->IsEncryptionEstablished() &&
 216       session_->connection()->connected();
 217 }
 218
 219 void QuicClient::Disconnect() {
 220   DCHECK(initialized_);
 221
 222   if (connected()) {
 223     session()->connection()->SendConnectionClose(QUIC_PEER_GOING_AWAY);
 224   }
 225   epoll_server_->UnregisterFD(fd_);
 226   close(fd_);
 227   fd_ = -1;
 228   initialized_ = false;
 229 }
 230
 231 void QuicClient::SendRequestsAndWaitForResponse(
 232     const base::CommandLine::StringVector& args) {
 233   for (size_t i = 0; i < args.size(); ++i) {
 234     BalsaHeaders headers;
 235     headers.SetRequestFirstlineFromStringPieces("GET", args[i], "HTTP/1.1");
 236     QuicSpdyClientStream* stream = CreateReliableClientStream();
 237     DCHECK(stream != nullptr);
 238     stream->SendRequest(headers, "", true);
 239     stream->set_visitor(this);
 240   }
 241
 242   while (WaitForEvents()) {}
 243 }
 244
 245 QuicSpdyClientStream* QuicClient::CreateReliableClientStream() {
 246   if (!connected()) {
 247     return nullptr;
 248   }
 249
 250   return session_->CreateOutgoingDataStream();
 251 }
 252
 253 void QuicClient::WaitForStreamToClose(QuicStreamId id) {
 254   DCHECK(connected());
 255
 256   while (connected() && !session_->IsClosedStream(id)) {
 257     epoll_server_->WaitForEventsAndExecuteCallbacks();
 258   }
 259 }
 260
 261 void QuicClient::WaitForCryptoHandshakeConfirmed() {
 262   DCHECK(connected());
 263
 264   while (connected() && !session_->IsCryptoHandshakeConfirmed()) {
 265     epoll_server_->WaitForEventsAndExecuteCallbacks();
 266   }
 267 }
 268
 269 bool QuicClient::WaitForEvents() {
 270   DCHECK(connected());
 271
 272   epoll_server_->WaitForEventsAndExecuteCallbacks();
 273   return session_->num_active_requests() != 0;
 274 }
 275
 276 void QuicClient::OnEvent(int fd, EpollEvent* event) {
 277   DCHECK_EQ(fd, fd_);
 278
 279   if (event->in_events & EPOLLIN) {
 280     while (connected() && ReadAndProcessPacket()) {
 281     }
 282   }
 283   if (connected() && (event->in_events & EPOLLOUT)) {
 284     writer_->SetWritable();
 285     session_->connection()->OnCanWrite();
 286   }
 287   if (event->in_events & EPOLLERR) {
 288     DVLOG(1) << "Epollerr";
 289   }
 290 }
 291
 292 void QuicClient::OnClose(QuicDataStream* stream) {
 293   QuicSpdyClientStream* client_stream =
 294       static_cast<QuicSpdyClientStream*>(stream);
 295   if (response_listener_.get() != nullptr) {
 296     response_listener_->OnCompleteResponse(
 297         stream->id(), client_stream->headers(), client_stream->data());
 298   }
 299
 300   if (!print_response_) {
 301     return;
 302   }
 303
 304   const BalsaHeaders& headers = client_stream->headers();
 305   printf("%s\n", headers.first_line().as_string().c_str());
 306   for (BalsaHeaders::const_header_lines_iterator i =
 307            headers.header_lines_begin();
 308        i != headers.header_lines_end(); ++i) {
 309     printf("%s: %s\n", i->first.as_string().c_str(),
 310            i->second.as_string().c_str());
 311   }
 312   printf("%s\n", client_stream->data().c_str());
 313 }
 314
 315 bool QuicClient::connected() const {
 316   return session_.get() && session_->connection() &&
 317       session_->connection()->connected();
 318 }
 319
 320 QuicConnectionId QuicClient::GenerateConnectionId() {
 321   return QuicRandom::GetInstance()->RandUint64();
 322 }
 323
 324 QuicEpollConnectionHelper* QuicClient::CreateQuicConnectionHelper() {
 325   return new QuicEpollConnectionHelper(epoll_server_);
 326 }
 327
 328 QuicPacketWriter* QuicClient::CreateQuicPacketWriter() {
 329   return new QuicDefaultPacketWriter(fd_);
 330 }
 331
 332 int QuicClient::ReadPacket(char* buffer,
 333                            int buffer_len,
 334                            IPEndPoint* server_address,
 335                            IPAddressNumber* client_ip) {
 336   return QuicSocketUtils::ReadPacket(
 337       fd_, buffer, buffer_len,
 338       overflow_supported_ ? &packets_dropped_ : nullptr, client_ip,
 339       server_address);
 340 }
 341
 342 bool QuicClient::ReadAndProcessPacket() {
 343   // Allocate some extra space so we can send an error if the server goes over
 344   // the limit.
 345   char buf[2 * kMaxPacketSize];
 346
 347   IPEndPoint server_address;
 348   IPAddressNumber client_ip;
 349
 350   int bytes_read = ReadPacket(buf, arraysize(buf), &server_address, &client_ip);
 351
 352   if (bytes_read < 0) {
 353     return false;
 354   }
 355
 356   QuicEncryptedPacket packet(buf, bytes_read, false);
 357
 358   IPEndPoint client_address(client_ip, client_address_.port());
 359   session_->connection()->ProcessUdpPacket(
 360       client_address, server_address, packet);
 361   return true;
 362 }
 363
 364 }  // namespace tools
 365 }  // namespace net