122 lines
4.0 KiB
Java
122 lines
4.0 KiB
Java
/*
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* Copyright 2014 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.proxy;
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import io.netty.channel.ChannelHandler;
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import io.netty.channel.ChannelHandlerContext;
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import io.netty.channel.ChannelPipeline;
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import io.netty.handler.codec.socksx.v4.DefaultSocks4CommandRequest;
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import io.netty.handler.codec.socksx.v4.Socks4ClientDecoder;
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import io.netty.handler.codec.socksx.v4.Socks4ClientEncoder;
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import io.netty.handler.codec.socksx.v4.Socks4CommandResponse;
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import io.netty.handler.codec.socksx.v4.Socks4CommandStatus;
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import io.netty.handler.codec.socksx.v4.Socks4CommandType;
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import java.net.InetSocketAddress;
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import java.net.SocketAddress;
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public final class Socks4ProxyHandler extends ProxyHandler {
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private static final String PROTOCOL = "socks4";
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private static final String AUTH_USERNAME = "username";
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private final String username;
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private String decoderName;
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private String encoderName;
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public Socks4ProxyHandler(SocketAddress proxyAddress) {
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this(proxyAddress, null);
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}
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public Socks4ProxyHandler(SocketAddress proxyAddress, String username) {
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super(proxyAddress);
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if (username != null && username.isEmpty()) {
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username = null;
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}
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this.username = username;
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}
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@Override
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public String protocol() {
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return PROTOCOL;
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}
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@Override
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public String authScheme() {
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return username != null? AUTH_USERNAME : AUTH_NONE;
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}
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public String username() {
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return username;
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}
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@Override
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protected void addCodec(ChannelHandlerContext ctx) throws Exception {
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ChannelPipeline p = ctx.pipeline();
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String name = ctx.name();
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Socks4ClientDecoder decoder = new Socks4ClientDecoder();
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p.addBefore(name, null, decoder);
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decoderName = p.context(decoder).name();
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encoderName = decoderName + ".encoder";
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p.addBefore(name, encoderName, Socks4ClientEncoder.INSTANCE);
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}
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@Override
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protected void removeEncoder(ChannelHandlerContext ctx) throws Exception {
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ChannelPipeline p = ctx.pipeline();
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ChannelHandler handler = p.remove(encoderName);
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System.err.println(ctx.handler().getClass());
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assert handler != ctx.handler();
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}
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@Override
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protected void removeDecoder(ChannelHandlerContext ctx) throws Exception {
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ChannelPipeline p = ctx.pipeline();
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ChannelHandler handler = p.remove(decoderName);
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System.err.println(ctx.handler().getClass());
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assert handler != ctx.handler();
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}
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@Override
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protected Object newInitialMessage(ChannelHandlerContext ctx) throws Exception {
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InetSocketAddress raddr = destinationAddress();
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String rhost;
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if (raddr.isUnresolved()) {
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rhost = raddr.getHostString();
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} else {
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rhost = raddr.getAddress().getHostAddress();
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}
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return new DefaultSocks4CommandRequest(
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Socks4CommandType.CONNECT, rhost, raddr.getPort(), username != null? username : "");
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}
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@Override
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protected boolean handleResponse(ChannelHandlerContext ctx, Object response) throws Exception {
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final Socks4CommandResponse res = (Socks4CommandResponse) response;
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final Socks4CommandStatus status = res.status();
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if (status == Socks4CommandStatus.SUCCESS) {
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return true;
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}
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throw new ProxyConnectException(exceptionMessage("status: " + status));
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}
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}
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