io.netty.handler.codec.socksx.v4.Socks4ServerDecoder Maven / Gradle / Ivy
/*
* 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.socksx.v4;
import io.netty.buffer.ByteBuf;
import io.netty.channel.ChannelHandlerContext;
import io.netty.handler.codec.DecoderException;
import io.netty.handler.codec.DecoderResult;
import io.netty.handler.codec.ReplayingDecoder;
import io.netty.handler.codec.socksx.SocksVersion;
import io.netty.handler.codec.socksx.v4.Socks4ServerDecoder.State;
import io.netty.util.CharsetUtil;
import io.netty.util.NetUtil;
import java.util.List;
/**
* Decodes a single {@link Socks4CommandRequest} from the inbound {@link ByteBuf}s.
* On successful decode, this decoder will forward the received data to the next handler, so that
* other handler can remove this decoder later. On failed decode, this decoder will discard the
* received data, so that other handler closes the connection later.
*/
public class Socks4ServerDecoder extends ReplayingDecoder {
private static final int MAX_FIELD_LENGTH = 255;
enum State {
START,
READ_USERID,
READ_DOMAIN,
SUCCESS,
FAILURE
}
private Socks4CommandType type;
private String dstAddr;
private int dstPort;
private String userId;
public Socks4ServerDecoder() {
super(State.START);
setSingleDecode(true);
}
@Override
protected void decode(ChannelHandlerContext ctx, ByteBuf in, List