/*
* 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.command.impl;
import java.io.IOException;
import java.net.InetSocketAddress;
import org.apache.ftpserver.DataConnectionException;
import org.apache.ftpserver.command.AbstractCommand;
import org.apache.ftpserver.ftplet.FtpReply;
import org.apache.ftpserver.ftplet.FtpRequest;
import org.apache.ftpserver.impl.FtpIoSession;
import org.apache.ftpserver.impl.FtpServerContext;
import org.apache.ftpserver.impl.LocalizedFtpReply;
import org.apache.ftpserver.impl.ServerDataConnectionFactory;
/**
* <strong>Internal class, do not use directly.</strong>
*
* The EPSV command requests that a server listen on a data port and wait for a
* connection. The EPSV command takes an optional argument. The response to this
* command includes only the TCP port number of the listening connection. The
* format of the response, however, is similar to the argument of the EPRT
* command. This allows the same parsing routines to be used for both commands.
* In addition, the format leaves a place holder for the network protocol and/or
* network address, which may be needed in the EPSV response in the future. The
* response code for entering passive mode using an extended address MUST be
* 229.
*
* @author <a href="http://mina.apache.org">Apache MINA Project</a>
*/
public class EPSV extends AbstractCommand {
/**
* Execute command.
*/
public void execute(final FtpIoSession session,
final FtpServerContext context, final FtpRequest request)
throws IOException {
// reset state variables
session.resetState();
// set data connection
ServerDataConnectionFactory dataCon = session.getDataConnection();
try {
InetSocketAddress dataConAddress = dataCon
.initPassiveDataConnection();
// get connection info
int servPort = dataConAddress.getPort();
// send connection info to client
String portStr = "|||" + servPort + '|';
session.write(LocalizedFtpReply.translate(session, request, context,
229, "EPSV", portStr));
} catch (DataConnectionException e) {
session
.write(LocalizedFtpReply.translate(session, request, context,
FtpReply.REPLY_425_CANT_OPEN_DATA_CONNECTION,
"EPSV", null));
return;
}
}
}