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      1 /*
      2  * libjingle
      3  * Copyright 2004--2005, 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 _ASYNCSOCKET_H_
     29 #define _ASYNCSOCKET_H_
     30 
     31 #include "talk/base/sigslot.h"
     32 
     33 namespace talk_base {
     34   class SocketAddress;
     35 }
     36 
     37 namespace buzz {
     38 
     39 class AsyncSocket {
     40 public:
     41   enum State {
     42     STATE_CLOSED = 0,      //!< Socket is not open.
     43     STATE_CLOSING,         //!< Socket is closing but can have buffered data
     44     STATE_CONNECTING,      //!< In the process of
     45     STATE_OPEN,            //!< Socket is connected
     46 #if defined(FEATURE_ENABLE_SSL)
     47     STATE_TLS_CONNECTING,  //!< Establishing TLS connection
     48     STATE_TLS_OPEN,        //!< TLS connected
     49 #endif
     50   };
     51 
     52   enum Error {
     53     ERROR_NONE = 0,         //!< No error
     54     ERROR_WINSOCK,          //!< Winsock error
     55     ERROR_DNS,              //!< Couldn't resolve host name
     56     ERROR_WRONGSTATE,       //!< Call made while socket is in the wrong state
     57 #if defined(FEATURE_ENABLE_SSL)
     58     ERROR_SSL,              //!< Something went wrong with OpenSSL
     59 #endif
     60   };
     61 
     62   virtual ~AsyncSocket() {}
     63   virtual State state() = 0;
     64   virtual Error error() = 0;
     65   virtual int GetError() = 0;    // winsock error code
     66 
     67   virtual bool Connect(const talk_base::SocketAddress& addr) = 0;
     68   virtual bool Read(char * data, size_t len, size_t* len_read) = 0;
     69   virtual bool Write(const char * data, size_t len) = 0;
     70   virtual bool Close() = 0;
     71 #if defined(FEATURE_ENABLE_SSL)
     72   // We allow matching any passed domain.  This allows us to avoid
     73   // handling the valuable certificates for logins into proxies.  If
     74   // both names are passed as empty, we do not require a match.
     75   virtual bool StartTls(const std::string & domainname) = 0;
     76 #endif
     77 
     78   sigslot::signal0<> SignalConnected;
     79   sigslot::signal0<> SignalSSLConnected;
     80   sigslot::signal0<> SignalClosed;
     81   sigslot::signal0<> SignalRead;
     82   sigslot::signal0<> SignalError;
     83 };
     84 
     85 }
     86 
     87 #endif
     88