前言
针对IOS App Proxy Server无法直连WebSocket，建立 Socket中转端。
WebSocket 端：
WebSocket 端用于实现实时通信功能。
WebSocket 端通过 WebSocket 协议与中转端通信，中转端可以通过 WebSocket 或其他传输协议与 WebSocket 端建立连接，收发消息。
定义 SendMessageToChatRoomIP 和 JoinChatRoom，用于处理来自客户端的消息和连接事件。
中转端 C1 （Socket Server）：
中转端 C1 是一个独立的应用程序，用于连接WebSocket端，建立Socket服务。
中转端 C1 的主要功能是接收来自客户端 C2 的消息，并将其转发给 WebSocket 端，或者接收来自 WebSocket 端的消息，并转发给客户端 C2。
客户端 C2 x N ：
客户端 C2 ，主要与中转端连接 发送数据，接收数据。
在客户端 C2 中，连接到中转端 C1、发送消息给中转端 C1、接收来自中转端 C1 的消息。
调用关系为：
客户端 C2 通过与中转端 C1 的通信，向 WebSocket 端发送消息或接收来自 WebSocket 端的消息。
中转端 C1 接收来自客户端 C2 的消息，并将其转发给 WebSocket 端，或者接收来自 WebSocket 端的消息，并转发给客户端 C2。
中转端实现
1.连接WebSocket
public async Task ConnectToServer()
{
try
{
connection = new HubConnectionBuilder()
.WithUrl("xxx/chathub")//
.Build();
connection.On<string, string, string, string>("ReceiveMessage", async (user, message, clientIP, chatRoomId) =>
{
Console.WriteLine($"Received message from wsserver_sr : {user}: {message} |socketserver {clientIP}|{chatRoomId}");
// 收到来自服务器的消息时，向客户端 C2 发送消息
await SendMessageToClientC2(user, message, clientIP, chatRoomId);
});
await connection.StartAsync();
}
catch (Exception ex)
{
Console.WriteLine($"Error connecting to SignalR server: {ex.Message}" + Environment.NewLine);
}
}收到消息时发送给对应客户端
public async Task SendMessageToClientC2(string user, string message, string clientIP, string chatRoomId)
{
// 根据 chatRoomId 找到对应的客户端 C2，并发送消息
if (chatRooms.ContainsKey(chatRoomId))
{
byte[] data = Encoding.ASCII.GetBytes($"{user} {message} |{clientIP}|{chatRoomId} ");
foreach (var client in chatRooms[chatRoomId])
{
await client.GetStream().WriteAsync(data, 0, data.Length);
}
}
else
{
Console.WriteLine($"Chat room {chatRoomId} does not exist" + Environment.NewLine);
}
}2.建立中转端Socket端口
public void StartListening()
{
if (!listening)
{
try
{
int port = 10086; // 监听端口
server = new TcpListener(IPAddress.Any, port);
server.Start();
listening = true;
Console.WriteLine($"Server listening on port {port}" + Environment.NewLine);
Task.Run(() => AcceptClients());
}
catch (Exception ex)
{
Console.WriteLine($"Error starting server: {ex.Message}" + Environment.NewLine);
}
}
}
3.向客户端发消息
public async Task AcceptClients()
{
while (listening)
{
try
{
TcpClient client = await server.AcceptTcpClientAsync();
Task.Run(() => HandleClient(client));
}
catch (Exception ex)
{
Console.WriteLine($"Error accepting client: {ex.Message}" + Environment.NewLine);
}
}
}4.监听客户端连接
public async Task AcceptClients()
{
while (listening)
{
try
{
TcpClient client = await server.AcceptTcpClientAsync();
Task.Run(() => HandleClient(client));
}
catch (Exception ex)
{
Console.WriteLine($"Error accepting client: {ex.Message}" + Environment.NewLine);
}
}
}5.处理客户端连接
public async Task HandleClient(TcpClient client)
{
NetworkStream stream = client.GetStream();
byte[] buffer = new byte[1024];
int bytesRead;
while (client.Connected)
{
try
{
bytesRead = await stream.ReadAsync(buffer, 0, buffer.Length);
string message = Encoding.ASCII.GetString(buffer, 0, bytesRead);
ProcessMessage(message, client);
}
catch (Exception ex)
{
Console.WriteLine($"Error receiving message: {ex.Message}" + Environment.NewLine);
break;
}
}
// 客户端断开连接时，从聊天室中移除
foreach (var chatRoomId in chatRooms.Keys)
{
if (chatRooms[chatRoomId].Contains(client))
{
chatRooms[chatRoomId].Remove(client);
Console.WriteLine($"Client disconnected from chat room {chatRoomId}" + Environment.NewLine);
break;
}
}
}6.处理连接
public async void ProcessMessage(string message, TcpClient client)
{
string[] parts = message.Split('|');
if (parts.Length >= 2)
{
string command = parts[0];
string chatRoomId = parts[1];
switch (command)
{
case "JoinChatRoom":
await JoinChatRoom(chatRoomId, client);
break;
case "SendMessageToChatRoomIP2":
if (parts.Length >= 4)
{
string user = parts[2];
string msg = parts[3];
// await SendMessageToChatRoom(chatRoomId, user, msg);
await SendMessageToChatRoomAddress(chatRoomId, user, msg, client);
}
break;
default:
Console.WriteLine($"Invalid command: {command}" + Environment.NewLine);
break;
}
}
}
JoinChatRoom 异步调用服务端的JoinChatRoom
SendMessageToChatRoomIP2 异步调用SendMessage
7.运行
本地运行
发布到linux
run Server listening on port 10860
netstat -tln查看端口 （tuln）
也可以优化封装成WinForm程序，收发消息可视化。
点击启动socket端口调用 1.连接websocket 2.监听socket
也可以封装成系统服务，与进程一样藏在后台运行。
客户端实现
1.连接Socket端
private async void MainForm_Load(object sender, EventArgs e)
{
try
{
client = new TcpClient();
await client.ConnectAsync("192.168.80.123", 10086);
stream = client.GetStream();
connected = true;
// 连接成功后，调用 JoinChatRoom 方法加入聊天室
await JoinChatRoom("room001");
Task.Run(ReceiveMessages);
}
catch (Exception ex)
{
textBoxReceivedMessages.AppendText($"Error connecting to server: {ex.Message}" + Environment.NewLine);
}
}2.加入ChatRoom
JoinChatRoom中转到Server端再加入聊天室
private async Task JoinChatRoom(string chatRoomId)
{
// 发送消息给中转端 C1，请求加入聊天室
byte[] data = Encoding.ASCII.GetBytes($"JoinChatRoom|{chatRoomId}|J");
await stream.WriteAsync(data, 0, data.Length);
}
3.发送消息
发送到Socket中转端
private async Task SendMessageToChatRoom(string chatRoomId, string message)
{
// 发送消息给中转端 C1，请求向指定聊天室发送消息
byte[] data = Encoding.ASCII.GetBytes($"SendMessageToChatRoomIP2|{chatRoomId}|client2m|{message}");
await stream.WriteAsync(data, 0, data.Length);
}
4.接收消息
private async Task ReceiveMessages()
{
byte[] buffer = new byte[1024];
int bytesRead;
while (connected)
{
try
{
bytesRead = await stream.ReadAsync(buffer, 0, buffer.Length);
string message = Encoding.ASCII.GetString(buffer, 0, bytesRead);
DisplayMessage(message);
}
catch (Exception ex)
{
textBoxReceivedMessages.AppendText($"Error receiving message: {ex.Message}" + Environment.NewLine);
}
}
}
private void DisplayMessage(string message)
{
if (InvokeRequired)
{
Invoke(new Action<string>(DisplayMessage), message);
return;
}
textBoxReceivedMessages.AppendText(message + Environment.NewLine);
}
5.点击事件
Send
private async void buttonSend_Click(object sender, EventArgs e)
{
if (!connected)
{
textBoxReceivedMessages.AppendText("Not connected to server." + Environment.NewLine);
return;
}
string message = textBoxSendMessage.Text;
if (!string.IsNullOrEmpty(message))
{
// 发送消息给中转端 C1，请求向聊天室发送消息
await SendMessageToChatRoom("room001", message);
textBoxSendMessage.Clear();
textBoxReceivedMessages.AppendText("Sent message to chat room: room001" + Environment.NewLine);
}
else
{
textBoxReceivedMessages.AppendText("Please enter a message." + Environment.NewLine);
}
}
6.运行
服务端启动
Server listening on port 10086
服务端发收发消息到中转端
Sent message to chat room: room001
client2m hihihi|socketclient 192.168.80.123 |::ffff:183.7.113.105|room001
中转端拿到客户端信息->WebSocket端->中转端接收->客户端接收
Client joined chat room room001
Received message from WSSserver_sr : client2m: hihihi|socketclient 192.168.80.123 |socketserver:::ffff:183.7.113.105|room001
客户端也可以用IOS SOCKET5发送消息
//...
dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(1 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
NSData * sendData = [@"JoinChatRoom|room001" dataUsingEncoding:NSUTF8StringEncoding];
[self.socket writeData:sendData withTimeout:-1 tag:1];
dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(1 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
NSData * sendData = [@"SendMessageToChatRoomIP2|room001|userid001|hello" dataUsingEncoding:NSUTF8StringEncoding];
[self.socket writeData:sendData withTimeout:-1 tag:2];
[self.socket readDataWithTimeout:-1 tag:1];
});
});
//...Run
