无法检索调用我的 TCPListener 服务的主机名 [英] Cannot retrieve hostname calling my TCPListener Service

问题描述

我正在使用 TcpListener 编写一个简单的 FTP 服务，并想找出传入呼叫使用的主机名(具有多个子域的域).

I am writing a simple FTP service using TcpListener and would like to find out what hostname (domain with multiple subdomains) the incoming call is using.

这可能吗?

//Barebone TCPListener example
System.Net.Sockets.TcpListener listener;
listener = new TcpListener(IPAddress.Any, 21)

listener.Start();

TcpClient client = listener.AcceptTcpClient();

//Great, incoming... what domain are they using to call my service?

//This only gives me the local and remote IP..
//IPEndPoint LocalEndPoint = (IPEndPoint)client.Client.LocalEndPoint;
//IPEndPoint RemoteEndPoint = (IPEndPoint)client.Client.RemoteEndPoint;

非常感谢任何指点.

推荐答案

我认为 TCP 从根本上拥有这些信息.这就是 HTTP 具有Host"标头以便客户端可以指定它的原因.

I don't think TCP fundamentally has that information. That's why HTTP has the "Host" header so clients can specify it.

本质上，与主机名建立 TCP 连接等同于将主机名解析为地址，然后建立连接，就好像从来没有过名称一样.

Essentially, making a TCP connection to a host name is equivalent to resolving the host name into an address, then making the connection as if there'd never been a name.

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