henrike@webrtc.org | f7795df | 2014-05-13 18:00:26 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 2004 The WebRTC Project Authors. All rights reserved. |
| 3 | * |
| 4 | * Use of this source code is governed by a BSD-style license |
| 5 | * that can be found in the LICENSE file in the root of the source |
| 6 | * tree. An additional intellectual property rights grant can be found |
| 7 | * in the file PATENTS. All contributing project authors may |
| 8 | * be found in the AUTHORS file in the root of the source tree. |
| 9 | */ |
| 10 | |
| 11 | #include "webrtc/base/asynctcpsocket.h" |
| 12 | |
| 13 | #include <string.h> |
| 14 | |
| 15 | #include "webrtc/base/byteorder.h" |
| 16 | #include "webrtc/base/common.h" |
| 17 | #include "webrtc/base/logging.h" |
| 18 | |
| 19 | #if defined(WEBRTC_POSIX) |
| 20 | #include <errno.h> |
| 21 | #endif // WEBRTC_POSIX |
| 22 | |
| 23 | namespace rtc { |
| 24 | |
| 25 | static const size_t kMaxPacketSize = 64 * 1024; |
| 26 | |
| 27 | typedef uint16 PacketLength; |
| 28 | static const size_t kPacketLenSize = sizeof(PacketLength); |
| 29 | |
| 30 | static const size_t kBufSize = kMaxPacketSize + kPacketLenSize; |
| 31 | |
| 32 | static const int kListenBacklog = 5; |
| 33 | |
| 34 | // Binds and connects |socket| |
| 35 | AsyncSocket* AsyncTCPSocketBase::ConnectSocket( |
| 36 | rtc::AsyncSocket* socket, |
| 37 | const rtc::SocketAddress& bind_address, |
| 38 | const rtc::SocketAddress& remote_address) { |
| 39 | rtc::scoped_ptr<rtc::AsyncSocket> owned_socket(socket); |
| 40 | if (socket->Bind(bind_address) < 0) { |
| 41 | LOG(LS_ERROR) << "Bind() failed with error " << socket->GetError(); |
| 42 | return NULL; |
| 43 | } |
| 44 | if (socket->Connect(remote_address) < 0) { |
| 45 | LOG(LS_ERROR) << "Connect() failed with error " << socket->GetError(); |
| 46 | return NULL; |
| 47 | } |
| 48 | return owned_socket.release(); |
| 49 | } |
| 50 | |
| 51 | AsyncTCPSocketBase::AsyncTCPSocketBase(AsyncSocket* socket, bool listen, |
| 52 | size_t max_packet_size) |
| 53 | : socket_(socket), |
| 54 | listen_(listen), |
| 55 | insize_(max_packet_size), |
| 56 | inpos_(0), |
| 57 | outsize_(max_packet_size), |
| 58 | outpos_(0) { |
| 59 | inbuf_ = new char[insize_]; |
| 60 | outbuf_ = new char[outsize_]; |
| 61 | |
| 62 | ASSERT(socket_.get() != NULL); |
| 63 | socket_->SignalConnectEvent.connect( |
| 64 | this, &AsyncTCPSocketBase::OnConnectEvent); |
| 65 | socket_->SignalReadEvent.connect(this, &AsyncTCPSocketBase::OnReadEvent); |
| 66 | socket_->SignalWriteEvent.connect(this, &AsyncTCPSocketBase::OnWriteEvent); |
| 67 | socket_->SignalCloseEvent.connect(this, &AsyncTCPSocketBase::OnCloseEvent); |
| 68 | |
| 69 | if (listen_) { |
| 70 | if (socket_->Listen(kListenBacklog) < 0) { |
| 71 | LOG(LS_ERROR) << "Listen() failed with error " << socket_->GetError(); |
| 72 | } |
| 73 | } |
| 74 | } |
| 75 | |
| 76 | AsyncTCPSocketBase::~AsyncTCPSocketBase() { |
| 77 | delete [] inbuf_; |
| 78 | delete [] outbuf_; |
| 79 | } |
| 80 | |
| 81 | SocketAddress AsyncTCPSocketBase::GetLocalAddress() const { |
| 82 | return socket_->GetLocalAddress(); |
| 83 | } |
| 84 | |
| 85 | SocketAddress AsyncTCPSocketBase::GetRemoteAddress() const { |
| 86 | return socket_->GetRemoteAddress(); |
| 87 | } |
| 88 | |
| 89 | int AsyncTCPSocketBase::Close() { |
| 90 | return socket_->Close(); |
| 91 | } |
| 92 | |
| 93 | AsyncTCPSocket::State AsyncTCPSocketBase::GetState() const { |
| 94 | switch (socket_->GetState()) { |
| 95 | case Socket::CS_CLOSED: |
| 96 | return STATE_CLOSED; |
| 97 | case Socket::CS_CONNECTING: |
| 98 | if (listen_) { |
| 99 | return STATE_BOUND; |
| 100 | } else { |
| 101 | return STATE_CONNECTING; |
| 102 | } |
| 103 | case Socket::CS_CONNECTED: |
| 104 | return STATE_CONNECTED; |
| 105 | default: |
| 106 | ASSERT(false); |
| 107 | return STATE_CLOSED; |
| 108 | } |
| 109 | } |
| 110 | |
| 111 | int AsyncTCPSocketBase::GetOption(Socket::Option opt, int* value) { |
| 112 | return socket_->GetOption(opt, value); |
| 113 | } |
| 114 | |
| 115 | int AsyncTCPSocketBase::SetOption(Socket::Option opt, int value) { |
| 116 | return socket_->SetOption(opt, value); |
| 117 | } |
| 118 | |
| 119 | int AsyncTCPSocketBase::GetError() const { |
| 120 | return socket_->GetError(); |
| 121 | } |
| 122 | |
| 123 | void AsyncTCPSocketBase::SetError(int error) { |
| 124 | return socket_->SetError(error); |
| 125 | } |
| 126 | |
| 127 | int AsyncTCPSocketBase::SendTo(const void *pv, size_t cb, |
| 128 | const SocketAddress& addr, |
| 129 | const rtc::PacketOptions& options) { |
| 130 | if (addr == GetRemoteAddress()) |
| 131 | return Send(pv, cb, options); |
| 132 | |
| 133 | ASSERT(false); |
| 134 | socket_->SetError(ENOTCONN); |
| 135 | return -1; |
| 136 | } |
| 137 | |
| 138 | int AsyncTCPSocketBase::SendRaw(const void * pv, size_t cb) { |
| 139 | if (outpos_ + cb > outsize_) { |
| 140 | socket_->SetError(EMSGSIZE); |
| 141 | return -1; |
| 142 | } |
| 143 | |
| 144 | memcpy(outbuf_ + outpos_, pv, cb); |
| 145 | outpos_ += cb; |
| 146 | |
| 147 | return FlushOutBuffer(); |
| 148 | } |
| 149 | |
| 150 | int AsyncTCPSocketBase::FlushOutBuffer() { |
| 151 | int res = socket_->Send(outbuf_, outpos_); |
| 152 | if (res <= 0) { |
| 153 | return res; |
| 154 | } |
| 155 | if (static_cast<size_t>(res) <= outpos_) { |
| 156 | outpos_ -= res; |
| 157 | } else { |
| 158 | ASSERT(false); |
| 159 | return -1; |
| 160 | } |
| 161 | if (outpos_ > 0) { |
| 162 | memmove(outbuf_, outbuf_ + res, outpos_); |
| 163 | } |
| 164 | return res; |
| 165 | } |
| 166 | |
| 167 | void AsyncTCPSocketBase::AppendToOutBuffer(const void* pv, size_t cb) { |
| 168 | ASSERT(outpos_ + cb < outsize_); |
| 169 | memcpy(outbuf_ + outpos_, pv, cb); |
| 170 | outpos_ += cb; |
| 171 | } |
| 172 | |
| 173 | void AsyncTCPSocketBase::OnConnectEvent(AsyncSocket* socket) { |
| 174 | SignalConnect(this); |
| 175 | } |
| 176 | |
| 177 | void AsyncTCPSocketBase::OnReadEvent(AsyncSocket* socket) { |
| 178 | ASSERT(socket_.get() == socket); |
| 179 | |
| 180 | if (listen_) { |
| 181 | rtc::SocketAddress address; |
| 182 | rtc::AsyncSocket* new_socket = socket->Accept(&address); |
| 183 | if (!new_socket) { |
| 184 | // TODO: Do something better like forwarding the error |
| 185 | // to the user. |
| 186 | LOG(LS_ERROR) << "TCP accept failed with error " << socket_->GetError(); |
| 187 | return; |
| 188 | } |
| 189 | |
| 190 | HandleIncomingConnection(new_socket); |
| 191 | |
| 192 | // Prime a read event in case data is waiting. |
| 193 | new_socket->SignalReadEvent(new_socket); |
| 194 | } else { |
| 195 | int len = socket_->Recv(inbuf_ + inpos_, insize_ - inpos_); |
| 196 | if (len < 0) { |
| 197 | // TODO: Do something better like forwarding the error to the user. |
| 198 | if (!socket_->IsBlocking()) { |
| 199 | LOG(LS_ERROR) << "Recv() returned error: " << socket_->GetError(); |
| 200 | } |
| 201 | return; |
| 202 | } |
| 203 | |
| 204 | inpos_ += len; |
| 205 | |
| 206 | ProcessInput(inbuf_, &inpos_); |
| 207 | |
| 208 | if (inpos_ >= insize_) { |
| 209 | LOG(LS_ERROR) << "input buffer overflow"; |
| 210 | ASSERT(false); |
| 211 | inpos_ = 0; |
| 212 | } |
| 213 | } |
| 214 | } |
| 215 | |
| 216 | void AsyncTCPSocketBase::OnWriteEvent(AsyncSocket* socket) { |
| 217 | ASSERT(socket_.get() == socket); |
| 218 | |
| 219 | if (outpos_ > 0) { |
| 220 | FlushOutBuffer(); |
| 221 | } |
| 222 | |
| 223 | if (outpos_ == 0) { |
| 224 | SignalReadyToSend(this); |
| 225 | } |
| 226 | } |
| 227 | |
| 228 | void AsyncTCPSocketBase::OnCloseEvent(AsyncSocket* socket, int error) { |
| 229 | SignalClose(this, error); |
| 230 | } |
| 231 | |
| 232 | // AsyncTCPSocket |
| 233 | // Binds and connects |socket| and creates AsyncTCPSocket for |
| 234 | // it. Takes ownership of |socket|. Returns NULL if bind() or |
| 235 | // connect() fail (|socket| is destroyed in that case). |
| 236 | AsyncTCPSocket* AsyncTCPSocket::Create( |
| 237 | AsyncSocket* socket, |
| 238 | const SocketAddress& bind_address, |
| 239 | const SocketAddress& remote_address) { |
| 240 | return new AsyncTCPSocket(AsyncTCPSocketBase::ConnectSocket( |
| 241 | socket, bind_address, remote_address), false); |
| 242 | } |
| 243 | |
| 244 | AsyncTCPSocket::AsyncTCPSocket(AsyncSocket* socket, bool listen) |
| 245 | : AsyncTCPSocketBase(socket, listen, kBufSize) { |
| 246 | } |
| 247 | |
| 248 | int AsyncTCPSocket::Send(const void *pv, size_t cb, |
| 249 | const rtc::PacketOptions& options) { |
| 250 | if (cb > kBufSize) { |
| 251 | SetError(EMSGSIZE); |
| 252 | return -1; |
| 253 | } |
| 254 | |
| 255 | // If we are blocking on send, then silently drop this packet |
| 256 | if (!IsOutBufferEmpty()) |
| 257 | return static_cast<int>(cb); |
| 258 | |
| 259 | PacketLength pkt_len = HostToNetwork16(static_cast<PacketLength>(cb)); |
| 260 | AppendToOutBuffer(&pkt_len, kPacketLenSize); |
| 261 | AppendToOutBuffer(pv, cb); |
| 262 | |
| 263 | int res = FlushOutBuffer(); |
| 264 | if (res <= 0) { |
| 265 | // drop packet if we made no progress |
| 266 | ClearOutBuffer(); |
| 267 | return res; |
| 268 | } |
| 269 | |
| 270 | // We claim to have sent the whole thing, even if we only sent partial |
| 271 | return static_cast<int>(cb); |
| 272 | } |
| 273 | |
| 274 | void AsyncTCPSocket::ProcessInput(char * data, size_t* len) { |
| 275 | SocketAddress remote_addr(GetRemoteAddress()); |
| 276 | |
| 277 | while (true) { |
| 278 | if (*len < kPacketLenSize) |
| 279 | return; |
| 280 | |
| 281 | PacketLength pkt_len = rtc::GetBE16(data); |
| 282 | if (*len < kPacketLenSize + pkt_len) |
| 283 | return; |
| 284 | |
| 285 | SignalReadPacket(this, data + kPacketLenSize, pkt_len, remote_addr, |
| 286 | CreatePacketTime(0)); |
| 287 | |
| 288 | *len -= kPacketLenSize + pkt_len; |
| 289 | if (*len > 0) { |
| 290 | memmove(data, data + kPacketLenSize + pkt_len, *len); |
| 291 | } |
| 292 | } |
| 293 | } |
| 294 | |
| 295 | void AsyncTCPSocket::HandleIncomingConnection(AsyncSocket* socket) { |
| 296 | SignalNewConnection(this, new AsyncTCPSocket(socket, false)); |
| 297 | } |
| 298 | |
| 299 | } // namespace rtc |