如何获得新的套接字连接中间会话? [英] How to get a new socket connection mid-session?
问题描述
我使用C风格的TCP套接字与发送()
和的recv()
。我有用户A和用户B,其中用户A作为服务器和用户B作为客户端之间运行的连接。
I'm using C-style TCP sockets with send()
and recv()
. I have a connection running between user A and user B, where user A acts as a server and user B acts as a client.
我想有一个被动的用户C,它不传达什么,而是接受来自用户的数据A.然而,新的被动用户C可以随时加入会议。 A可能比它会发出B分别发送不同的ç..包我想这将是最好的A-C到不同的端口比A-B
I want to have a passive user C, which does not communicate anything, but receives data from user A. However, the new passive user C can join the session at any time. A might send C different packets than what it would send B.. I imagine it would be best for A-C to communicate on a different port than A-B
如何可以这样连接在通信的任意点进行(没有螺纹,或类似物)?
How can this connection be made (without threading, or the like) in an arbitrary point of communication?
修改仍然没有解决。
推荐答案
您可以设置检测新连接的监听器和镜像流量到所有打开的插座。我最近写了我的意思在C#中:(我要看看我是否能迅速地把它转换成一个C样品)
You could setup a listener that detects new connections, and mirror traffic to all open sockets. I recently wrote what I mean in C#: (i'll see whether I can quickly turn that into a C sample)
这个例子只接受在开始传入连接的固定NR,但它是死的容易改变的。
This example only accepts a fixed nr of incoming connections at the start, but it is dead easy to change that.
using System;
using System.Collections.Generic;
using System.Net;
using System.Net.Sockets;
using System.Text;
using System.Linq;
public class Demo
{
static IList<Socket> StartServer(int numberOfClients)
{
using(Socket main = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp))
{
main.Bind(new IPEndPoint(IPAddress.Any, 9050));
main.Listen(numberOfClients);
var clients = Enumerable
.Range(1,numberOfClients)
.Select(i => {
Console.WriteLine("Waiting for 1 more client...");
Socket client = main.Accept();
Console.WriteLine("Connected to {0}", client.RemoteEndPoint);
return client; })
.ToList();
main.Close();
return clients;
}
}
public static void Main()
{
var clients = StartServer(4);
while(clients.Count()>1) // still a conversation
{
var copyList = clients.ToList();
Console.WriteLine("Monitoring {0} sockets...", copyList.Count);
Socket.Select(copyList, null, null, 10000000);
foreach(Socket client in copyList)
{
byte[] data = new byte[1024];
int recv = client.Receive(data);
if (recv == 0)
{
Console.WriteLine("Client {0} disconnected.", client.RemoteEndPoint);
client.Close();
clients.Remove(client);
}
else
foreach (var other in clients.Except(new [] {client}))
other.Send(data, recv, SocketFlags.None);
}
}
Console.WriteLine("Last client disconnected, bye");
}
}
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