SocksServerHandler.java
3.3 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
/*
* 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:
*
* https://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 cc.leevi.common.socks5proxy;
import io.netty.buffer.Unpooled;
import io.netty.channel.ChannelHandler;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.SimpleChannelInboundHandler;
import io.netty.handler.codec.socksx.SocksMessage;
import io.netty.handler.codec.socksx.SocksVersion;
import io.netty.handler.codec.socksx.v4.Socks4CommandRequest;
import io.netty.handler.codec.socksx.v4.Socks4CommandType;
import io.netty.handler.codec.socksx.v5.*;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
@ChannelHandler.Sharable
public final class SocksServerHandler extends SimpleChannelInboundHandler<SocksMessage> {
private Logger logger = LoggerFactory.getLogger(SocksServerHandler.class);
public static final SocksServerHandler INSTANCE = new SocksServerHandler();
private SocksServerHandler() { }
@Override
public void channelRead0(ChannelHandlerContext ctx, SocksMessage socksRequest) throws Exception {
if(!socksRequest.version().equals(SocksVersion.SOCKS5)){
logger.error("only supports socks5 protocol!");
ctx.writeAndFlush(Unpooled.wrappedBuffer("protocol version illegal!".getBytes()));
return ;
}
if (socksRequest instanceof Socks5InitialRequest) {
ctx.pipeline().addFirst(new Socks5CommandRequestDecoder());
ctx.write(new DefaultSocks5InitialResponse(Socks5AuthMethod.NO_AUTH));
//如果需要密码，这里可以换成
// ctx.write(new DefaultSocks5InitialResponse(Socks5AuthMethod.PASSWORD));
} else if (socksRequest instanceof Socks5PasswordAuthRequest) {
//如果需要密码，这里需要验证密码
ctx.pipeline().addFirst(new Socks5CommandRequestDecoder());
ctx.write(new DefaultSocks5PasswordAuthResponse(Socks5PasswordAuthStatus.SUCCESS));
} else if (socksRequest instanceof Socks5CommandRequest) {
Socks5CommandRequest socks5CmdRequest = (Socks5CommandRequest) socksRequest;
if (socks5CmdRequest.type() == Socks5CommandType.CONNECT) {
ctx.pipeline().addLast(new SocksServerConnectHandler());
ctx.pipeline().remove(this);
ctx.fireChannelRead(socksRequest);
} else {
ctx.close();
}
} else {
ctx.close();
}
}
@Override
public void channelReadComplete(ChannelHandlerContext ctx) {
ctx.flush();
}
@Override
public void exceptionCaught(ChannelHandlerContext ctx, Throwable throwable) {
logger.error("exceptionCaught",throwable);
SocksServerUtils.closeOnFlush(ctx.channel());
}
}