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The MockFtpServer project provides mock/dummy FTP server implementations for testing FTP client code. Two FTP Server implementations are provided, each at a different level of abstraction. FakeFtpServer provides a higher-level abstraction. You define a virtual file system, including directories and files, as well as a set of valid user accounts and credentials. The FakeFtpServer then responds with appropriate replies and reply codes based on that configuration. StubFtpServer, on the other hand, is a lower-level "stub" implementation. You configure the individual FTP server commands to return custom data or reply codes, allowing simulation of either success or failure scenarios. You can also verify expected command invocations.

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/*
 * Copyright 2009 the original author or authors.
 *
 * Licensed 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.mockftpserver.fake.command;

import org.mockftpserver.core.command.Command;
import org.mockftpserver.core.command.ReplyCodes;
import org.mockftpserver.core.session.Session;

import java.net.InetAddress;

/**
 * CommandHandler for the EPSV command. Handler logic:
 * 
 * If the user has not logged in, then reply with 530
 * Otherwise, request the Session to switch to passive data connection mode. Return a reply code
 * of 229, along with response text including: "(|||PORT|)", where PORT is the 16-bit
 * TCP port address of the data connection on the server to which the client must connect.
 * 
 * See RFC2428 for more information.
 *
 * @author Chris Mair
 */
public class EpsvCommandHandler extends AbstractFakeCommandHandler {

    protected void handle(Command command, Session session) {
        verifyLoggedIn(session);
        int port = session.switchToPassiveMode();
        InetAddress server = session.getServerHost();
        LOG.debug("server=" + server + " port=" + port);
        sendReply(session, ReplyCodes.EPSV_OK, "epsv", list(Integer.toString(port)));
    }

}