1 /* 2 * libjingle 3 * Copyright 2004--2010, Google Inc. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions are met: 7 * 8 * 1. Redistributions of source code must retain the above copyright notice, 9 * this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright notice, 11 * this list of conditions and the following disclaimer in the documentation 12 * and/or other materials provided with the distribution. 13 * 3. The name of the author may not be used to endorse or promote products 14 * derived from this software without specific prior written permission. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED 17 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 18 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO 19 * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 20 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 21 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 22 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 23 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 24 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 25 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 26 */ 27 28 #ifndef TALK_BASE_ASYNCTCPSOCKET_H_ 29 #define TALK_BASE_ASYNCTCPSOCKET_H_ 30 31 #include "talk/base/asyncpacketsocket.h" 32 #include "talk/base/scoped_ptr.h" 33 #include "talk/base/socketfactory.h" 34 35 namespace talk_base { 36 37 // Simulates UDP semantics over TCP. Send and Recv packet sizes 38 // are preserved, and drops packets silently on Send, rather than 39 // buffer them in user space. 40 class AsyncTCPSocketBase : public AsyncPacketSocket { 41 public: 42 AsyncTCPSocketBase(AsyncSocket* socket, bool listen, size_t max_packet_size); 43 virtual ~AsyncTCPSocketBase(); 44 45 // Pure virtual methods to send and recv data. 46 virtual int Send(const void *pv, size_t cb, DiffServCodePoint dscp) = 0; 47 virtual void ProcessInput(char* data, size_t* len) = 0; 48 // Signals incoming connection. 49 virtual void HandleIncomingConnection(AsyncSocket* socket) = 0; 50 51 virtual SocketAddress GetLocalAddress() const; 52 virtual SocketAddress GetRemoteAddress() const; 53 virtual int SendTo(const void *pv, size_t cb, const SocketAddress& addr, 54 DiffServCodePoint dscp); 55 virtual int Close(); 56 57 virtual State GetState() const; 58 virtual int GetOption(Socket::Option opt, int* value); 59 virtual int SetOption(Socket::Option opt, int value); 60 virtual int GetError() const; 61 virtual void SetError(int error); 62 63 protected: 64 // Binds and connects |socket| and creates AsyncTCPSocket for 65 // it. Takes ownership of |socket|. Returns NULL if bind() or 66 // connect() fail (|socket| is destroyed in that case). 67 static AsyncSocket* ConnectSocket(AsyncSocket* socket, 68 const SocketAddress& bind_address, 69 const SocketAddress& remote_address); 70 virtual int SendRaw(const void* pv, size_t cb); 71 int FlushOutBuffer(); 72 // Add data to |outbuf_|. 73 void AppendToOutBuffer(const void* pv, size_t cb); 74 75 // Helper methods for |outpos_|. IsOutBufferEmpty()76 bool IsOutBufferEmpty() const { return outpos_ == 0; } ClearOutBuffer()77 void ClearOutBuffer() { outpos_ = 0; } 78 79 private: 80 // Called by the underlying socket 81 void OnConnectEvent(AsyncSocket* socket); 82 void OnReadEvent(AsyncSocket* socket); 83 void OnWriteEvent(AsyncSocket* socket); 84 void OnCloseEvent(AsyncSocket* socket, int error); 85 86 scoped_ptr<AsyncSocket> socket_; 87 bool listen_; 88 char* inbuf_, * outbuf_; 89 size_t insize_, inpos_, outsize_, outpos_; 90 91 DISALLOW_EVIL_CONSTRUCTORS(AsyncTCPSocketBase); 92 }; 93 94 class AsyncTCPSocket : public AsyncTCPSocketBase { 95 public: 96 // Binds and connects |socket| and creates AsyncTCPSocket for 97 // it. Takes ownership of |socket|. Returns NULL if bind() or 98 // connect() fail (|socket| is destroyed in that case). 99 static AsyncTCPSocket* Create(AsyncSocket* socket, 100 const SocketAddress& bind_address, 101 const SocketAddress& remote_address); 102 AsyncTCPSocket(AsyncSocket* socket, bool listen); ~AsyncTCPSocket()103 virtual ~AsyncTCPSocket() {} 104 105 virtual int Send(const void* pv, size_t cb, DiffServCodePoint dscp); 106 virtual void ProcessInput(char* data, size_t* len); 107 virtual void HandleIncomingConnection(AsyncSocket* socket); 108 109 private: 110 DISALLOW_EVIL_CONSTRUCTORS(AsyncTCPSocket); 111 }; 112 113 } // namespace talk_base 114 115 #endif // TALK_BASE_ASYNCTCPSOCKET_H_ 116