0cb4cc4e49
Motivation: We wish to separate these two into clearer write/read interfaces. In particular, we don't want to be able to add listeners to promises, because it makes it easy to add them out of order. We can't prevent it entirely, because any promise can be freely converted to a future where listeners can be added. We can, however, discourage this in the API. Modification: The Promise interface no longer extends the Future interface. Numerous changes to make the project compile and its tests run. Result: Clearer separation of concerns in the code.
133 lines
6.2 KiB
Java
133 lines
6.2 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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* https://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.example.socksproxy;
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import io.netty.bootstrap.Bootstrap;
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import io.netty.channel.Channel;
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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.ChannelOption;
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import io.netty.channel.SimpleChannelInboundHandler;
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import io.netty.channel.socket.nio.NioSocketChannel;
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import io.netty.handler.codec.socksx.SocksMessage;
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import io.netty.handler.codec.socksx.v4.DefaultSocks4CommandResponse;
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import io.netty.handler.codec.socksx.v4.Socks4CommandRequest;
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import io.netty.handler.codec.socksx.v4.Socks4CommandStatus;
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import io.netty.handler.codec.socksx.v5.DefaultSocks5CommandResponse;
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import io.netty.handler.codec.socksx.v5.Socks5CommandRequest;
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import io.netty.handler.codec.socksx.v5.Socks5CommandStatus;
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import io.netty.util.concurrent.Future;
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import io.netty.util.concurrent.Promise;
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@ChannelHandler.Sharable
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public final class SocksServerConnectHandler extends SimpleChannelInboundHandler<SocksMessage> {
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private final Bootstrap b = new Bootstrap();
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@Override
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public void messageReceived(final ChannelHandlerContext ctx, final SocksMessage message) throws Exception {
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if (message instanceof Socks4CommandRequest) {
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final Socks4CommandRequest request = (Socks4CommandRequest) message;
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Promise<Channel> promise = ctx.executor().newPromise();
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promise.asFuture().addListener(future -> {
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final Channel outboundChannel = future.getNow();
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if (future.isSuccess()) {
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Future<Void> responseFuture = ctx.channel().writeAndFlush(
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new DefaultSocks4CommandResponse(Socks4CommandStatus.SUCCESS));
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responseFuture.addListener(fut -> {
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ctx.pipeline().remove(this);
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outboundChannel.pipeline().addLast(new RelayHandler(ctx.channel()));
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ctx.pipeline().addLast(new RelayHandler(outboundChannel));
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});
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} else {
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ctx.channel().writeAndFlush(
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new DefaultSocks4CommandResponse(Socks4CommandStatus.REJECTED_OR_FAILED));
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SocksServerUtils.closeOnFlush(ctx.channel());
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}
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});
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final Channel inboundChannel = ctx.channel();
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b.group(inboundChannel.executor())
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.channel(NioSocketChannel.class)
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.option(ChannelOption.CONNECT_TIMEOUT_MILLIS, 10000)
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.option(ChannelOption.SO_KEEPALIVE, true)
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.handler(new DirectClientHandler(promise));
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b.connect(request.dstAddr(), request.dstPort()).addListener(future -> {
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if (future.isSuccess()) {
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// Connection established use handler provided results
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} else {
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// Close the connection if the connection attempt has failed.
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ctx.channel().writeAndFlush(
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new DefaultSocks4CommandResponse(Socks4CommandStatus.REJECTED_OR_FAILED)
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);
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SocksServerUtils.closeOnFlush(ctx.channel());
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}
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});
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} else if (message instanceof Socks5CommandRequest) {
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final Socks5CommandRequest request = (Socks5CommandRequest) message;
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Promise<Channel> promise = ctx.executor().newPromise();
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promise.asFuture().addListener(future -> {
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final Channel outboundChannel = future.getNow();
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if (future.isSuccess()) {
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Future<Void> responseFuture =
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ctx.channel().writeAndFlush(new DefaultSocks5CommandResponse(
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Socks5CommandStatus.SUCCESS,
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request.dstAddrType(),
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request.dstAddr(),
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request.dstPort()));
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responseFuture.addListener(fut -> {
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ctx.pipeline().remove(this);
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outboundChannel.pipeline().addLast(new RelayHandler(ctx.channel()));
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ctx.pipeline().addLast(new RelayHandler(outboundChannel));
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});
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} else {
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ctx.channel().writeAndFlush(new DefaultSocks5CommandResponse(
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Socks5CommandStatus.FAILURE, request.dstAddrType()));
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SocksServerUtils.closeOnFlush(ctx.channel());
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}
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});
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final Channel inboundChannel = ctx.channel();
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b.group(inboundChannel.executor())
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.channel(NioSocketChannel.class)
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.option(ChannelOption.CONNECT_TIMEOUT_MILLIS, 10000)
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.option(ChannelOption.SO_KEEPALIVE, true)
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.handler(new DirectClientHandler(promise));
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b.connect(request.dstAddr(), request.dstPort()).addListener(future -> {
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if (future.isSuccess()) {
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// Connection established use handler provided results
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} else {
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// Close the connection if the connection attempt has failed.
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ctx.channel().writeAndFlush(
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new DefaultSocks5CommandResponse(Socks5CommandStatus.FAILURE, request.dstAddrType()));
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SocksServerUtils.closeOnFlush(ctx.channel());
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}
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});
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} else {
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ctx.close();
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}
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}
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@Override
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public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
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SocksServerUtils.closeOnFlush(ctx.channel());
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}
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}
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