/*
* 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.example.socksproxy;
import io.netty.bootstrap.Bootstrap;
import io.netty.channel.Channel;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelFutureListener;
import io.netty.channel.ChannelHandler;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelOption;
import io.netty.channel.SimpleChannelInboundHandler;
import io.netty.channel.socket.nio.NioSocketChannel;
import io.netty.handler.codec.socksx.SocksRequest;
import io.netty.handler.codec.socksx.v4.Socks4CmdRequest;
import io.netty.handler.codec.socksx.v4.Socks4CmdResponse;
import io.netty.handler.codec.socksx.v4.Socks4CmdStatus;
import io.netty.handler.codec.socksx.v5.Socks5CmdRequest;
import io.netty.handler.codec.socksx.v5.Socks5CmdResponse;
import io.netty.handler.codec.socksx.v5.Socks5CmdStatus;
import io.netty.util.concurrent.Future;
import io.netty.util.concurrent.GenericFutureListener;
import io.netty.util.concurrent.Promise;
@ChannelHandler.Sharable
public final class SocksServerConnectHandler extends SimpleChannelInboundHandler<SocksRequest> {
private final Bootstrap b = new Bootstrap();
@Override
public void messageReceived(final ChannelHandlerContext ctx, final SocksRequest message) throws Exception {
if (message instanceof Socks4CmdRequest) {
final Socks4CmdRequest request = (Socks4CmdRequest) message;
Promise<Channel> promise = ctx.executor().newPromise();
promise.addListener(
new GenericFutureListener<Future<Channel>>() {
@Override
public void operationComplete(final Future<Channel> future) throws Exception {
final Channel outboundChannel = future.getNow();
if (future.isSuccess()) {
ctx.channel().writeAndFlush(new Socks4CmdResponse(Socks4CmdStatus.SUCCESS))
.addListener(new ChannelFutureListener() {
@Override
public void operationComplete(ChannelFuture channelFuture) {
ctx.pipeline().remove(SocksServerConnectHandler.this);
outboundChannel.pipeline().addLast(new RelayHandler(ctx.channel()));
ctx.pipeline().addLast(new RelayHandler(outboundChannel));
}
});
} else {
ctx.channel().writeAndFlush(
new Socks4CmdResponse(Socks4CmdStatus.REJECTED_OR_FAILED)
);
SocksServerUtils.closeOnFlush(ctx.channel());
}
}
});
final Channel inboundChannel = ctx.channel();
b.group(inboundChannel.eventLoop())
.channel(NioSocketChannel.class)
.option(ChannelOption.CONNECT_TIMEOUT_MILLIS, 10000)
.option(ChannelOption.SO_KEEPALIVE, true)
.handler(new DirectClientHandler(promise));
b.connect(request.host(), request.port()).addListener(new ChannelFutureListener() {
@Override
public void operationComplete(ChannelFuture future) throws Exception {
if (future.isSuccess()) {
// Connection established use handler provided results
} else {
// Close the connection if the connection attempt has failed.
ctx.channel().writeAndFlush(
new Socks4CmdResponse(Socks4CmdStatus.REJECTED_OR_FAILED)
);
SocksServerUtils.closeOnFlush(ctx.channel());
}
}
});
} else if (message instanceof Socks5CmdRequest) {
final Socks5CmdRequest request = (Socks5CmdRequest) message;
Promise<Channel> promise = ctx.executor().newPromise();
promise.addListener(
new GenericFutureListener<Future<Channel>>() {
@Override
public void operationComplete(final Future<Channel> future) throws Exception {
final Channel outboundChannel = future.getNow();
if (future.isSuccess()) {
ctx.channel().writeAndFlush(
new Socks5CmdResponse(Socks5CmdStatus.SUCCESS, request.addressType())
).addListener(new ChannelFutureListener() {
@Override
public void operationComplete(ChannelFuture channelFuture) {
ctx.pipeline().remove(SocksServerConnectHandler.this);
outboundChannel.pipeline().addLast(new RelayHandler(ctx.channel()));
ctx.pipeline().addLast(new RelayHandler(outboundChannel));
}
}
);
} else {
ctx.channel().writeAndFlush(
new Socks5CmdResponse(Socks5CmdStatus.FAILURE, request.addressType()));
SocksServerUtils.closeOnFlush(ctx.channel());
}
}
});
final Channel inboundChannel = ctx.channel();
b.group(inboundChannel.eventLoop())
.channel(NioSocketChannel.class)
.option(ChannelOption.CONNECT_TIMEOUT_MILLIS, 10000)
.option(ChannelOption.SO_KEEPALIVE, true)
.handler(new DirectClientHandler(promise));
b.connect(request.host(), request.port()).addListener(new ChannelFutureListener() {
@Override
public void operationComplete(ChannelFuture future) throws Exception {
if (future.isSuccess()) {
// Connection established use handler provided results
} else {
// Close the connection if the connection attempt has failed.
ctx.channel().writeAndFlush(
new Socks5CmdResponse(Socks5CmdStatus.FAILURE, request.addressType()));
SocksServerUtils.closeOnFlush(ctx.channel());
}
}
});
} else {
ctx.close();
}
}
@Override
public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
SocksServerUtils.closeOnFlush(ctx.channel());
}
}