openssladapter.h

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#ifndef UTILS_BASE_OPENSSLADAPTER_H_
#define UTILS_BASE_OPENSSLADAPTER_H_

#include <string>
#include "ssladapter.h"

typedef struct ssl_st SSL;
typedef struct ssl_ctx_st SSL_CTX;
typedef struct x509_store_ctx_st X509_STORE_CTX;

namespace utils_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 utils_base

#endif // UTILS_BASE_OPENSSLADAPTER_H_