/*
* 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.InetAddress;
import java.net.InetSocketAddress;
import java.net.UnknownHostException;
import org.apache.ftpserver.DataConnectionConfiguration;
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.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* <strong>Internal class, do not use directly.</strong>
*
* The EPRT command allows for the specification of an extended address for the
* data connection. The extended address MUST consist of the network protocol as
* well as the network and transport addresses. The format of EPRT is:
*
* EPRT<space><d><net-prt><d><net-addr><d><tcp-port><d>
*
* @author <a href="http://mina.apache.org">Apache MINA Project</a>
*/
public class EPRT extends AbstractCommand {
private final Logger LOG = LoggerFactory.getLogger(EPRT.class);
/**
* Execute command.
*/
public void execute(final FtpIoSession session,
final FtpServerContext context, final FtpRequest request)
throws IOException {
// reset state variables
session.resetState();
// argument check
String arg = request.getArgument();
if (arg == null) {
session.write(LocalizedFtpReply.translate(session, request, context,
FtpReply.REPLY_501_SYNTAX_ERROR_IN_PARAMETERS_OR_ARGUMENTS,
"EPRT", null));
return;
}
// is port enabled
DataConnectionConfiguration dataCfg = session.getListener()
.getDataConnectionConfiguration();
if (!dataCfg.isActiveEnabled()) {
session.write(LocalizedFtpReply.translate(session, request, context,
FtpReply.REPLY_501_SYNTAX_ERROR_IN_PARAMETERS_OR_ARGUMENTS, "EPRT.disabled", null));
return;
}
// parse argument
String host = null;
String port = null;
try {
char delim = arg.charAt(0);
int lastDelimIdx = arg.indexOf(delim, 3);
host = arg.substring(3, lastDelimIdx);
port = arg.substring(lastDelimIdx + 1, arg.length() - 1);
} catch (Exception ex) {
LOG.debug("Exception parsing host and port: " + arg, ex);
session.write(LocalizedFtpReply.translate(session, request, context,
FtpReply.REPLY_501_SYNTAX_ERROR_IN_PARAMETERS_OR_ARGUMENTS, "EPRT", null));
return;
}
// get data server
InetAddress dataAddr = null;
try {
dataAddr = InetAddress.getByName(host);
} catch (UnknownHostException ex) {
LOG.debug("Unknown host: " + host, ex);
session
.write(LocalizedFtpReply
.translate(
session,
request,
context,
FtpReply.REPLY_501_SYNTAX_ERROR_IN_PARAMETERS_OR_ARGUMENTS,
"EPRT.host", null));
return;
}
// check IP
if (dataCfg.isActiveIpCheck()) {
if (session.getRemoteAddress() instanceof InetSocketAddress) {
InetAddress clientAddr = ((InetSocketAddress) session
.getRemoteAddress()).getAddress();
if (!dataAddr.equals(clientAddr)) {
session.write(LocalizedFtpReply.translate(session, request,
context, FtpReply.REPLY_501_SYNTAX_ERROR_IN_PARAMETERS_OR_ARGUMENTS, "EPRT.mismatch", null));
return;
}
}
}
// get data server port
int dataPort = 0;
try {
dataPort = Integer.parseInt(port);
} catch (NumberFormatException ex) {
LOG.debug("Invalid port: " + port, ex);
session
.write(LocalizedFtpReply
.translate(
session,
request,
context,
FtpReply.REPLY_501_SYNTAX_ERROR_IN_PARAMETERS_OR_ARGUMENTS,
"EPRT.invalid", null));
return;
}
session.getDataConnection().initActiveDataConnection(
new InetSocketAddress(dataAddr, dataPort));
session.write(LocalizedFtpReply.translate(session, request, context,
FtpReply.REPLY_200_COMMAND_OKAY, "EPRT", null));
}
}