Question

我正在尝试使用C＃实现Hole punching 但不幸的是我花了几个小时来弄清楚它为什么对我不起作用。这是我的问题：

我有一个第三方服务器，我可以管理所有外部IP，同时我的路由器在NAT后面，我认为我的所有同行都在NAT之后。

说我是否设法找出所有奴隶（同伴），终点（外部ips）。在我的电脑上运行的服务器的外部IP地址（不是第三方），以及放置对等IP地址的位置在哪里？

这是我的代码：

public void HolePunch(String ServerIp, Int32 Port) // if I put my external ip here I get Exception (An address incompatible with the requested protocol was used)
{
    IPEndPoint LocalPt = new IPEndPoint(Dns.GetHostEntry(Dns.GetHostName()).AddressList[0], Port);
    UdpClient Client = new UdpClient();
    Client.ExclusiveAddressUse = false;
    Client.Client.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.ReuseAddress, true);
    Client.Client.Bind(LocalPt);

    IPEndPoint RemotePt = new IPEndPoint(IPAddress.Parse(ServerIp), Port);

    // This Part Sends your local endpoint to the server so if the two peers are on the same nat they can bypass it, you can omit this if you wish to just use the remote endpoint.
    byte[] IPBuffer = System.Text.Encoding.UTF8.GetBytes(Dns.GetHostEntry(Dns.GetHostName()).AddressList[0].ToString());
    byte[] LengthBuffer = BitConverter.GetBytes(IPBuffer.Length);
    byte[] PortBuffer = BitConverter.GetBytes(Port);
    byte[] Buffer = new byte[IPBuffer.Length + LengthBuffer.Length + PortBuffer.Length];
    LengthBuffer.CopyTo(Buffer,0);
    IPBuffer.CopyTo(Buffer, LengthBuffer.Length);
    PortBuffer.CopyTo(Buffer, IPBuffer.Length + LengthBuffer.Length);
    Client.BeginSend(Buffer, Buffer.Length, RemotePt, new AsyncCallback(SendCallback), Client);

    // Wait to receve something
    BeginReceive(Client, Port);

    // you may want to use a auto or manual ResetEvent here and have the server send back a confirmation, the server should have now stored your local (you sent it) and remote endpoint.

    // you now need to work out who you need to connect to then ask the server for there remote and local end point then need to try to connect to the local first then the remote.
    // if the server knows who you need to connect to you could just have it send you the endpoints as the confirmation.

    // you may also need to keep this open with a keepalive packet untill it is time to connect to the peer or peers.

    // once you have the endpoints of the peer you can close this connection unless you need to keep asking the server for other endpoints

    Client.Close();
}

public void ConnectToPeer(String PeerIp, Int32 Port)
{
    IPEndPoint LocalPt = new IPEndPoint(Dns.GetHostEntry(Dns.GetHostName()).AddressList[0], Port);
    UdpClient Client = new UdpClient();
    Client.ExclusiveAddressUse = false;
    Client.Client.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.ReuseAddress, true);
    Client.Client.Bind(LocalPt);
    IPEndPoint RemotePt = new IPEndPoint(IPAddress.Parse(PeerIp), Port);
    Client.Connect(RemotePt);
    //you may want to keep the peer client connections in a list.

    BeginReceive(Client, Port);
}

public void SendCallback(IAsyncResult ar)
{
    UdpClient Client = (UdpClient)ar.AsyncState;
    Client.EndSend(ar);
}

public void BeginReceive(UdpClient Client, Int32 Port)
{
    IPEndPoint ListenPt = new IPEndPoint(IPAddress.Any, Port);

    Object[] State = new Object[] { Client, ListenPt };

    Client.BeginReceive(new AsyncCallback(ReceiveCallback), State);
}

public void ReceiveCallback(IAsyncResult ar)
{
    UdpClient Client = (UdpClient)((Object[])ar.AsyncState)[0];
    IPEndPoint ListenPt = (IPEndPoint)((Object[])ar.AsyncState)[0];

    Byte[] receiveBytes = Client.EndReceive(ar, ref ListenPt);
}

编辑：代码工作将如果我给它我的本地IP和如果我的客户在我的电脑..但如果我提供它外部IP它不起作用（第一行注释中的例外）

打孔 - 在哪里放置外部IP？

0 个答案: