| /* |
| * 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.util; |
| |
| import java.net.InetAddress; |
| import java.net.InetSocketAddress; |
| import java.net.UnknownHostException; |
| import java.util.StringTokenizer; |
| |
| /** |
| * <strong>Internal class, do not use directly.</strong> |
| * |
| * Encodes and decodes socket addresses (IP and port) from and to the format |
| * used with for example the PORT and PASV command |
| * |
| * @author <a href="http://mina.apache.org">Apache MINA Project</a> |
| */ |
| public class SocketAddressEncoder { |
| |
| private static int convertAndValidateNumber(String s) { |
| int i = Integer.parseInt(s); |
| if (i < 0) { |
| throw new IllegalArgumentException("Token can not be less than 0"); |
| } else if (i > 255) { |
| throw new IllegalArgumentException( |
| "Token can not be larger than 255"); |
| } |
| |
| return i; |
| } |
| |
| public static InetSocketAddress decode(String str) |
| throws UnknownHostException { |
| StringTokenizer st = new StringTokenizer(str, ","); |
| if (st.countTokens() != 6) { |
| throw new IllegalInetAddressException("Illegal amount of tokens"); |
| } |
| |
| StringBuffer sb = new StringBuffer(); |
| try { |
| sb.append(convertAndValidateNumber(st.nextToken())); |
| sb.append('.'); |
| sb.append(convertAndValidateNumber(st.nextToken())); |
| sb.append('.'); |
| sb.append(convertAndValidateNumber(st.nextToken())); |
| sb.append('.'); |
| sb.append(convertAndValidateNumber(st.nextToken())); |
| } catch (IllegalArgumentException e) { |
| throw new IllegalInetAddressException(e.getMessage()); |
| } |
| |
| InetAddress dataAddr = InetAddress.getByName(sb.toString()); |
| |
| // get data server port |
| int dataPort = 0; |
| try { |
| int hi = convertAndValidateNumber(st.nextToken()); |
| int lo = convertAndValidateNumber(st.nextToken()); |
| dataPort = (hi << 8) | lo; |
| } catch (IllegalArgumentException ex) { |
| throw new IllegalPortException("Invalid data port: " + str); |
| } |
| |
| return new InetSocketAddress(dataAddr, dataPort); |
| } |
| |
| public static String encode(InetSocketAddress address) { |
| InetAddress servAddr = address.getAddress(); |
| int servPort = address.getPort(); |
| return servAddr.getHostAddress().replace('.', ',') + ',' |
| + (servPort >> 8) + ',' + (servPort & 0xFF); |
| } |
| |
| } |