io.netty.handler.codec.socks.SocksInitResponseDecoder 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.socks;
import io.netty.buffer.ByteBuf;
import io.netty.channel.ChannelHandlerContext;
import io.netty.handler.codec.ReplayingDecoder;
/**
* Decodes {@link ByteBuf}s into {@link SocksInitResponse}.
* Before returning SocksResponse decoder removes itself from pipeline.
*/
public class SocksInitResponseDecoder extends ReplayingDecoder {
private static final String name = "SOCKS_INIT_RESPONSE_DECODER";
public static String getName() {
return name;
}
private SocksProtocolVersion version;
private SocksAuthScheme authScheme;
private SocksResponse msg = SocksCommonUtils.UNKNOWN_SOCKS_RESPONSE;
public SocksInitResponseDecoder() {
super(State.CHECK_PROTOCOL_VERSION);
}
@Override
protected SocksResponse decode(ChannelHandlerContext ctx, ByteBuf byteBuf) throws Exception {
switch (state()) {
case CHECK_PROTOCOL_VERSION: {
version = SocksProtocolVersion.fromByte(byteBuf.readByte());
if (version != SocksProtocolVersion.SOCKS5) {
break;
}
checkpoint(State.READ_PREFFERED_AUTH_TYPE);
}
case READ_PREFFERED_AUTH_TYPE: {
authScheme = SocksAuthScheme.fromByte(byteBuf.readByte());
msg = new SocksInitResponse(authScheme);
break;
}
}
ctx.pipeline().remove(this);
return msg;
}
enum State {
CHECK_PROTOCOL_VERSION,
READ_PREFFERED_AUTH_TYPE
}
}