/*
* 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.SocksAuthRequestDecoder.State;
import io.netty.util.CharsetUtil;
import java.util.List;
/**
* Decodes {@link ByteBuf}s into {@link SocksAuthRequest}.
* Before returning SocksRequest decoder removes itself from pipeline.
*/
public class SocksAuthRequestDecoder extends ReplayingDecoder<State> {
private static final String name = "SOCKS_AUTH_REQUEST_DECODER";
/**
* @deprecated Will be removed at the next minor version bump.
*/
@Deprecated
public static String getName() {
return name;
}
private SocksSubnegotiationVersion version;
private int fieldLength;
private String username;
private String password;
private SocksRequest msg = SocksCommonUtils.UNKNOWN_SOCKS_REQUEST;
public SocksAuthRequestDecoder() {
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 = SocksSubnegotiationVersion.valueOf(byteBuf.readByte());
if (version != SocksSubnegotiationVersion.AUTH_PASSWORD) {
break;
}
checkpoint(State.READ_USERNAME);
}
case READ_USERNAME: {
fieldLength = byteBuf.readByte();
username = byteBuf.readBytes(fieldLength).toString(CharsetUtil.US_ASCII);
checkpoint(State.READ_PASSWORD);
}
case READ_PASSWORD: {
fieldLength = byteBuf.readByte();
password = byteBuf.readBytes(fieldLength).toString(CharsetUtil.US_ASCII);
msg = new SocksAuthRequest(username, password);
}
}
ctx.pipeline().remove(this);
out.add(msg);
}
enum State {
CHECK_PROTOCOL_VERSION,
READ_USERNAME,
READ_PASSWORD
}
}