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Java example source code file (SocksCmdResponseDecoder.java)

This example Java source code file (SocksCmdResponseDecoder.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

bytebuf, check_protocol_version, domain, exception, ipv6, list, read_cmd_address, read_cmd_header, socksaddresstype, sockscmdresponse, sockscmdresponsedecoder, socksprotocolversion, state, unknown, util

The SocksCmdResponseDecoder.java Java example source code

/*
 * 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 io.netty.handler.codec.socks;

import io.netty.buffer.ByteBuf;
import io.netty.channel.ChannelHandlerContext;
import io.netty.handler.codec.ReplayingDecoder;
import io.netty.handler.codec.socks.SocksCmdResponseDecoder.State;

import java.util.List;

/**
 * Decodes {@link ByteBuf}s into {@link SocksCmdResponse}.
 * Before returning SocksResponse decoder removes itself from pipeline.
 */
public class SocksCmdResponseDecoder extends ReplayingDecoder<State> {

    private SocksProtocolVersion version;
    private int fieldLength;
    private SocksCmdStatus cmdStatus;
    private SocksAddressType addressType;
    private byte reserved;
    private String host;
    private int port;
    private SocksResponse msg = SocksCommonUtils.UNKNOWN_SOCKS_RESPONSE;

    public SocksCmdResponseDecoder() {
        super(State.CHECK_PROTOCOL_VERSION);
    }

    @Override
    protected void decode(ChannelHandlerContext ctx, ByteBuf byteBuf, List<Object> out) throws Exception {
        switch (state()) {
            case CHECK_PROTOCOL_VERSION: {
                version = SocksProtocolVersion.valueOf(byteBuf.readByte());
                if (version != SocksProtocolVersion.SOCKS5) {
                    break;
                }
                checkpoint(State.READ_CMD_HEADER);
            }
            case READ_CMD_HEADER: {
                cmdStatus = SocksCmdStatus.valueOf(byteBuf.readByte());
                reserved = byteBuf.readByte();
                addressType = SocksAddressType.valueOf(byteBuf.readByte());
                checkpoint(State.READ_CMD_ADDRESS);
            }
            case READ_CMD_ADDRESS: {
                switch (addressType) {
                    case IPv4: {
                        host = SocksCommonUtils.intToIp(byteBuf.readInt());
                        port = byteBuf.readUnsignedShort();
                        msg = new SocksCmdResponse(cmdStatus, addressType, host, port);
                        break;
                    }
                    case DOMAIN: {
                        fieldLength = byteBuf.readByte();
                        host = SocksCommonUtils.readUsAscii(byteBuf, fieldLength);
                        port = byteBuf.readUnsignedShort();
                        msg = new SocksCmdResponse(cmdStatus, addressType, host, port);
                        break;
                    }
                    case IPv6: {
                        byte[] bytes = new byte[16];
                        byteBuf.readBytes(bytes);
                        host = SocksCommonUtils.ipv6toStr(bytes);
                        port = byteBuf.readUnsignedShort();
                        msg = new SocksCmdResponse(cmdStatus, addressType, host, port);
                        break;
                    }
                    case UNKNOWN:
                        break;
                }
            }
        }
        ctx.pipeline().remove(this);
        out.add(msg);
    }

    enum State {
        CHECK_PROTOCOL_VERSION,
        READ_CMD_HEADER,
        READ_CMD_ADDRESS
    }
}

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