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The Netty project is an effort to provide an asynchronous event-driven
network application framework and tools for rapid development of
maintainable high performance and high scalability protocol servers and
clients. In other words, Netty is a NIO client server framework which
enables quick and easy development of network applications such as protocol
servers and clients. It greatly simplifies and streamlines network
programming such as TCP and UDP socket server.
/*
* Copyright 2012 The Netty Project
*
* The Netty Project 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.jboss.netty.handler.codec.socks;
import org.jboss.netty.buffer.ChannelBuffer;
import org.jboss.netty.channel.Channel;
import org.jboss.netty.channel.ChannelHandlerContext;
import org.jboss.netty.handler.codec.replay.ReplayingDecoder;
import org.jboss.netty.util.CharsetUtil;
/**
* Decodes {@link ChannelBuffer}s into {@link SocksCmdRequest}.
* Before returning SocksRequest decoder removes itself from pipeline.
*/
public class SocksCmdRequestDecoder extends ReplayingDecoder {
private static final String name = "SOCKS_CMD_REQUEST_DECODER";
public static String getName() {
return name;
}
private SocksMessage.ProtocolVersion version;
private int fieldLength;
private SocksMessage.CmdType cmdType;
private SocksMessage.AddressType addressType;
private byte reserved;
private String host;
private int port;
private SocksRequest msg = SocksCommonUtils.UNKNOWN_SOCKS_REQUEST;
public SocksCmdRequestDecoder() {
super(State.CHECK_PROTOCOL_VERSION);
}
@Override
protected Object decode(ChannelHandlerContext ctx, Channel channel,
ChannelBuffer buffer, State state) throws Exception {
switch (state) {
case CHECK_PROTOCOL_VERSION: {
version = SocksMessage.ProtocolVersion.fromByte(buffer.readByte());
if (version != SocksMessage.ProtocolVersion.SOCKS5) {
break;
}
checkpoint(State.READ_CMD_HEADER);
}
case READ_CMD_HEADER: {
cmdType = SocksMessage.CmdType.fromByte(buffer.readByte());
reserved = buffer.readByte();
addressType = SocksMessage.AddressType.fromByte(buffer.readByte());
checkpoint(State.READ_CMD_ADDRESS);
}
case READ_CMD_ADDRESS: {
switch (addressType) {
case IPv4: {
host = SocksCommonUtils.intToIp(buffer.readInt());
port = buffer.readUnsignedShort();
msg = new SocksCmdRequest(cmdType, addressType, host, port);
break;
}
case DOMAIN: {
fieldLength = buffer.readByte();
host = buffer.readBytes(fieldLength).toString(CharsetUtil.US_ASCII);
port = buffer.readUnsignedShort();
msg = new SocksCmdRequest(cmdType, addressType, host, port);
break;
}
case IPv6: {
host = SocksCommonUtils.ipv6toStr(buffer.readBytes(16).array());
port = buffer.readUnsignedShort();
msg = new SocksCmdRequest(cmdType, addressType, host, port);
break;
}
case UNKNOWN:
break;
}
}
}
ctx.getPipeline().remove(this);
return msg;
}
enum State {
CHECK_PROTOCOL_VERSION,
READ_CMD_HEADER,
READ_CMD_ADDRESS
}
}