| /* |
| * 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, |
| 510, "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, |
| 510, "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_553_REQUESTED_ACTION_NOT_TAKEN_FILE_NAME_NOT_ALLOWED, |
| "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, 510, "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_552_REQUESTED_FILE_ACTION_ABORTED_EXCEEDED_STORAGE, |
| "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)); |
| } |
| } |