76 lines
2.5 KiB
Java
76 lines
2.5 KiB
Java
/*
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* Copyright 2012 The Netty Project
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*
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* The Netty Project licenses this file to you under the Apache License,
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* version 2.0 (the "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at:
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*/
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package io.netty.handler.codec.socks;
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import io.netty.buffer.ByteBuf;
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import io.netty.channel.ChannelHandlerContext;
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import io.netty.handler.codec.ReplayingDecoder;
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import io.netty.handler.codec.socks.SocksAuthRequestDecoder.State;
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import java.util.List;
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/**
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* Decodes {@link ByteBuf}s into {@link SocksAuthRequest}.
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* Before returning SocksRequest decoder removes itself from pipeline.
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*/
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public class SocksAuthRequestDecoder extends ReplayingDecoder<State> {
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private String username;
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public SocksAuthRequestDecoder() {
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super(State.CHECK_PROTOCOL_VERSION);
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}
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@Override
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protected void decode(ChannelHandlerContext ctx, ByteBuf byteBuf, List<Object> out) throws Exception {
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switch (state()) {
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case CHECK_PROTOCOL_VERSION: {
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if (byteBuf.readByte() != SocksSubnegotiationVersion.AUTH_PASSWORD.byteValue()) {
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out.add(SocksCommonUtils.UNKNOWN_SOCKS_REQUEST);
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checkpoint(State.DONE);
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return;
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}
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checkpoint(State.READ_USERNAME);
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}
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case READ_USERNAME: {
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int fieldLength = byteBuf.readByte();
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username = SocksCommonUtils.readUsAscii(byteBuf, fieldLength);
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checkpoint(State.READ_PASSWORD);
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}
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case READ_PASSWORD: {
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int fieldLength = byteBuf.readByte();
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String password = SocksCommonUtils.readUsAscii(byteBuf, fieldLength);
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out.add(new SocksAuthRequest(username, password));
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checkpoint(State.DONE);
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return;
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}
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case DONE:
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ctx.pipeline().remove(this);
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return;
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default: {
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throw new Error();
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}
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}
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}
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enum State {
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CHECK_PROTOCOL_VERSION,
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READ_USERNAME,
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READ_PASSWORD,
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DONE
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}
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}
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