text: /*
   * libjingle
   * Copyright 2004--2005, Google Inc.
   *
   * Redistribution and use in source and binary forms, with or without 
   * modification, are permitted provided that the following conditions are met:
   *
   *  1. Redistributions of source code must retain the above copyright notice, 
   *     this list of conditions and the following disclaimer.
   *  2. Redistributions in binary form must reproduce the above copyright notice,
   *     this list of conditions and the following disclaimer in the documentation
   *     and/or other materials provided with the distribution.
   *  3. The name of the author may not be used to endorse or promote products 
   *     derived from this software without specific prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
   * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 
   * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
   * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 
   * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
   * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
   * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
   * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 
   * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 
   * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   */
  
  #ifndef TALK_BASE_OPENSSLADAPTER_H__
  #define TALK_BASE_OPENSSLADAPTER_H__
  
  #include <string>
  #include "talk/base/ssladapter.h"
  
  typedef struct ssl_st SSL;
  typedef struct ssl_ctx_st SSL_CTX;
  typedef struct x509_store_ctx_st X509_STORE_CTX;
  
  namespace talk_base {
  
  ///////////////////////////////////////////////////////////////////////////////
  
  class OpenSSLAdapter : public SSLAdapter {
  public:
    OpenSSLAdapter(AsyncSocket* socket);
    virtual ~OpenSSLAdapter();
  
    virtual int StartSSL(const char* hostname, bool restartable);
    virtual int Send(const void* pv, size_t cb);
    virtual int Recv(void* pv, size_t cb);
    virtual int Close();
  
    // Note that the socket returns ST_CONNECTING while SSL is being negotiated.
    virtual ConnState GetState() const;
  
  protected:
    virtual void OnConnectEvent(AsyncSocket* socket);
    virtual void OnReadEvent(AsyncSocket* socket);
    virtual void OnWriteEvent(AsyncSocket* socket);
    virtual void OnCloseEvent(AsyncSocket* socket, int err);
  
  private:
    enum SSLState {
      SSL_NONE, SSL_WAIT, SSL_CONNECTING, SSL_CONNECTED, SSL_ERROR
    };
  
    int BeginSSL();
    int ContinueSSL();
    void Error(const char* context, int err, bool signal = true);
    void Cleanup();
  
    bool SSLPostConnectionCheck(SSL* ssl, const char* host);
  #if _DEBUG
    static void SSLInfoCallback(const SSL* s, int where, int ret);
  #endif  // !_DEBUG
    static int SSLVerifyCallback(int ok, X509_STORE_CTX* store);
  
    static SSL_CTX* SetupSSLContext();
  
    SSLState state_;
    bool ssl_read_needs_write_;
    bool ssl_write_needs_read_;
    // If true, socket will retain SSL configuration after Close.
    bool restartable_; 
  
    SSL* ssl_;
    SSL_CTX* ssl_ctx_;
    std::string ssl_host_name_;
  };
  
  /////////////////////////////////////////////////////////////////////////////
  
  } // namespace talk_base
  
  #endif // TALK_BASE_OPENSSLADAPTER_H__
  