/*
 * Copyright (C) 2003 Sun Microsystems, Inc.
 * Copyright (C) 2003-2010 Martin Koegler
 *
 * This is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This software is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this software; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307,
 * USA.
 */

package com.iiordanov.bVNC;

import java.net.Socket;

import javax.net.ssl.SSLContext;
import javax.net.ssl.SSLSocket;
import javax.net.ssl.SSLSocketFactory;

import android.util.Log;

public abstract class TLSTunnelBase {

private static final String TAG = "TLSTunnelBase";

public TLSTunnelBase (Socket sock_) {
    sock = sock_;
  }

  protected void initContext (SSLContext sc) throws java.security.GeneralSecurityException {
    sc.init (null, null, null);
  }

  public void setup (RfbProto cc) throws Exception {
    try {
      SSLSocketFactory sslfactory;
      SSLSocket sslsock;
      SSLContext sc = SSLContext.getInstance ("TLS");
      Log.i(TAG, "Generating TLS context");
      initContext (sc);
      Log.i(TAG, "Doing TLS handshake");
      sslfactory = sc.getSocketFactory ();
      sslsock = (SSLSocket) sslfactory.createSocket (sock,
						     sock.getInetAddress().
						     getHostName(),
						     sock.getPort(), true);

      sslsock.setTcpNoDelay(true);
      sslsock.setSoTimeout(Constants.SOCKET_CONN_TIMEOUT);

      setParam (sslsock);

      sslsock.setSoTimeout(0);

      /* Not necessary - just ensures that we know what cipher
       * suite we are using for the output of toString()
       */
      sslsock.startHandshake ();

      Log.i(TAG, "TLS done");
      
      cc.setStreams (sslsock.getInputStream(), sslsock.getOutputStream());
    }
    catch (java.io.IOException e) {
      throw new Exception("TLS handshake failed " + e.toString ());
    }
    catch (java.security.GeneralSecurityException e) {
      throw new Exception("TLS handshake failed " + e.toString ());
    }
  }

  protected abstract void setParam (SSLSocket sock) throws Exception;

  Socket sock;

}