/*
* 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.
*/
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 The Apache MINA Project ([email protected])
*/
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 Exception("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 Exception(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 Exception("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);
}
}
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