@zonghaishang 的答案：
> @xcorpio telnet调用，代码可以开一个tcp长连接，按照dubbo提供的调用命令，直接写socket数据和读取就可以了
>
> 如果你熟悉dubbo框架代码，请阅读：org.apache.dubbo.rpc.protocol.dubbo.telnet.InvokeTelnetHandler
>
> 如果不熟悉，请使用sudo tcpdump -i any -A dst port 20880 抓包看返回数据
我有个疑问，telent 好像判断了是否是clientside
```java
private static boolean isClientSide(Channel channel) {
InetSocketAddress address = channel.getRemoteAddress(); //1
URL url = channel.getUrl();
return url.getPort() == address.getPort() &&
NetUtils.filterLocalHost(url.getIp())
.equals(NetUtils.filterLocalHost(address.getAddress().getHostAddress())); //2
}
```
在 1 这个点channel.getRemoteAddress(); 是获取调用方的地址吧。
在 2 的时候会判断调用方ip 跟本机是否一致
[ Full content available at:
https://github.com/apache/incubator-dubbo/issues/3161 ]
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