/*
* 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;
import java.io.IOException;
import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.net.UnknownHostException;
import org.apache.ftpserver.ftplet.FtpReply;
import org.apache.ftpserver.ftplet.FtpRequest;
import org.apache.ftpserver.interfaces.DataConnectionConfiguration;
import org.apache.ftpserver.interfaces.FtpIoSession;
import org.apache.ftpserver.interfaces.FtpServerContext;
import org.apache.ftpserver.util.FtpReplyUtil;
import org.apache.ftpserver.util.IllegalInetAddressException;
import org.apache.ftpserver.util.IllegalPortException;
import org.apache.ftpserver.util.SocketAddressEncoder;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* <code>PORT <SP> <host-port> <CRLF></code><br>
*
* The argument is a HOST-PORT specification for the data port
* to be used in data connection. There are defaults for both
* the user and server data ports, and under normal
* circumstances this command and its reply are not needed. If
* this command is used, the argument is the concatenation of a
* 32-bit internet host address and a 16-bit TCP port address.
* This address information is broken into 8-bit fields and the
* value of each field is transmitted as a decimal number (in
* character string representation). The fields are separated
* by commas. A port command would be:
*
* PORT h1,h2,h3,h4,p1,p2
*
* where h1 is the high order 8 bits of the internet host address.
*/
public
class PORT extends AbstractCommand {
private final Logger LOG = LoggerFactory.getLogger(PORT.class);
/**
* Execute command.
*/
public void execute(final FtpIoSession session,
final FtpServerContext context,
final FtpRequest request) throws IOException {
// reset state variables
session.resetState();
// argument check
if(!request.hasArgument()) {
session.write(FtpReplyUtil.translate(session, request, context, FtpReply.REPLY_501_SYNTAX_ERROR_IN_PARAMETERS_OR_ARGUMENTS, "PORT", null));
return;
}
// is port enabled
DataConnectionConfiguration dataCfg = session.getListener().getDataConnectionConfiguration();
if(!dataCfg.isActiveEnabled()) {
session.write(FtpReplyUtil.translate(session, request, context, 510, "PORT.disabled", null));
return;
}
InetSocketAddress address;
try {
address = SocketAddressEncoder.decode(request.getArgument());
} catch(IllegalInetAddressException e) {
session.write(FtpReplyUtil.translate(session, request, context, 510, "PORT", null));
return;
} catch(IllegalPortException e) {
LOG.debug("Invalid data port: " + request.getArgument(), e);
session.write(FtpReplyUtil.translate(session, request, context, FtpReply.REPLY_552_REQUESTED_FILE_ACTION_ABORTED_EXCEEDED_STORAGE, "PORT.invalid", null));
return;
} catch(UnknownHostException e) {
LOG.debug("Unknown host", e);
session.write(FtpReplyUtil.translate(session, request, context, FtpReply.REPLY_553_REQUESTED_ACTION_NOT_TAKEN_FILE_NAME_NOT_ALLOWED, "PORT.host", null));
return;
}
// check IP
if(dataCfg.isActiveIpCheck()) {
if(session.getRemoteAddress() instanceof InetSocketAddress) {
InetAddress clientAddr = ((InetSocketAddress)session.getRemoteAddress()).getAddress();
if(!address.getAddress().equals(clientAddr)) {
session.write(FtpReplyUtil.translate(session, request, context, 510, "PORT.mismatch", null));
return;
}
}
}
session.getDataConnection().initActiveDataConnection(address);
session.write(FtpReplyUtil.translate(session, request, context, FtpReply.REPLY_200_COMMAND_OKAY, "PORT", null));
}
}