dataconnectionconfiguration.java

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/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *  http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

package org.apache.ftpserver;

import java.net.InetAddress;

import org.apache.ftpserver.ssl.SslConfiguration;

/**
 * Data connection configuration interface.
 *
 * @author The Apache MINA Project ([e-mail])
 * @version $Rev: 729474 $, $Date: 2008-12-26 11:09:07 +0100 (Fri, 26 Dec 2008) $
 */
public interface DataConnectionConfiguration {

    /**
     * Get the maximum idle time in seconds.
     * @return The maximum idle time
     */
    int getIdleTime();

    /**
     * Is active data connection enabled?
     * @return true if active data connections are enabled
     */
    boolean isActiveEnabled();

    /**
     * Check the PORT IP with the client IP?
     * @return true if the PORT IP is verified
     */
    boolean isActiveIpCheck();

    /**
     * Get the active data connection local host.
     * @return The {@link InetAddress} for active connections
     */
    String getActiveLocalAddress();

    /**
     * Get the active data connection local port.
     * @return The active data connection local port
     */
    int getActiveLocalPort();

    /**
     * Get passive server address. null, if not set in the configuration.
     * @return The {@link InetAddress} used for passive connections
     */
    String getPassiveAddress();

    /**
     * Get the passive address that will be returned to clients on the PASV
     * command.
     * 
     * @return The passive address to be returned to clients, null if not
     *         configured.
     */
    String getPassiveExernalAddress();

    /**
     * Get the passive ports to be used for data connections. Ports can be
     * defined as single ports, closed or open ranges. Multiple definitions can
     * be separated by commas, for example:
     * <ul>
     * <li>2300 : only use port 2300 as the passive port</li>
     * <li>2300-2399 : use all ports in the range</li>
     * <li>2300- : use all ports larger than 2300</li>
     * <li>2300, 2305, 2400- : use 2300 or 2305 or any port larger than 2400</li>
     * </ul>
     * 
     * Defaults to using any available port
     * 
     * @return The passive ports string
     */
    String getPassivePorts();

    /**
     * Request a passive port. Will block until a port is available
     * @return A free passive part
     */
    int requestPassivePort();

    /**
     * Release passive port.
     * @param port The port to be released
     */
    void releasePassivePort(int port);

    /**
     * Get SSL configuration for this data connection.
     * @return The {@link SslConfiguration}
     */
    SslConfiguration getSslConfiguration();
    
    /**
     * @return True if SSL is mandatory for the data channel
     */
    boolean isImplicitSsl();
}