//License/*** * Java TelnetD library (embeddable telnet daemon) * Copyright (c) 2000-2005 Dieter Wimberger  * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions are * met: * Redistributions of source code must retain the above copyright notice, * this list of conditions and the following disclaimer. * 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. * * Neither the name of the author nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. *   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER AND CONTRIBUTORS ``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 REGENTS OR CONTRIBUTORS 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. ***/
package net.wimpi.telnetd.net;

import java.net.InetAddress;
import java.util.Properties;

/**
 * Interface defining a generic IP level connection
 * filter.<br>
 * Due to the fact that this task depends heavily on
 * application context, I chose a very generic way
 * of applying IP level connection filtering.
 * <br><br>
 * Implementations should consider following issues:
 * <ul>
 * <li>performance
 * <li>administration (maybe via an admin shell)
 * <li>logging denials
 * </ul>
 *
 * @author Dieter Wimberger
 * @version 2.0 (16/07/2006)
 */
public interface ConnectionFilter {

  /**
   * Initializes this <tt>ConnectionFilter</tt>.
   *
   * @param props the properties of the listener that instantiated
   *              this <tt>ConnectionFilter</tt>.
   */
  public void initialize(Properties props);

  /**
   * Tests if a given ip address is allowed to connect.
   *
   * @param ip the address to be tested.
   * @return true if allowed to connect, false otherwise.
   */
  public boolean isAllowed(InetAddress ip);

}//interface ConnectionFilter