Proxy server that kinda works maybe sorta????

Elisa/Controllers/IndexController.cs

@@ -9,7 +9,7 @@ namespace Elisa.Controllers;
 public class IndexController : ControllerBase
 {
     [HttpGet("version")]
-    public async Task<IResult> Version([FromQuery] string req_idreturn)
+    public async Task<IResult> Version([FromQuery] string req_id)
     {
         return Results.Json(new
         {

Elisa/GameServer.cs

@@ -1,23 +1,39 @@
 using Microsoft.AspNetCore.Builder;
+using Microsoft.AspNetCore.Http;
 using Microsoft.AspNetCore.Server.Kestrel.Core;
 using Microsoft.Extensions.DependencyInjection;
 using Serilog;
 
 namespace Elisa;
 
-public class GameServer
+public static class GameServer
 {
     public static async Task Start()
     {
         WebApplicationBuilder builder = WebApplication.CreateBuilder(Environment.GetCommandLineArgs());
         builder.Host.UseSerilog();
-        builder.Services.Configure<KestrelServerOptions>(op => op.AllowSynchronousIO = true);
+        builder.Services.Configure<KestrelServerOptions>(options =>
+        {
+            options.AllowSynchronousIO = true;
+        });
         builder.Services.AddControllers();
 
         WebApplication app = builder.Build();
         app.UseAuthorization();
         app.UseSerilogRequestLogging();
+        app.Map("/", HandleRequest);
         app.MapControllers();
         app.Run();
     }
+
+    static async Task HandleRequest(HttpContext context)
+    {
+        if (context.Request.Method == "CONNECT")
+            context.Response.StatusCode = StatusCodes.Status200OK;
+        else
+        {
+            context.Response.StatusCode = StatusCodes.Status405MethodNotAllowed;
+            await context.Response.WriteAsync("Method Not Allowed");
+        }
+    }
 }

Elisa/Program.cs

@@ -36,6 +36,7 @@ internal static class Program
         stopwatch.Stop();
         Log.Information($"Done! Loaded in {stopwatch.ElapsedMilliseconds}ms");
 
+        Task.Run(Proxy.Start);
         Task.Run(GameServer.Start).Wait();
     }
 

Elisa/Proxy.cs

@@ -0,0 +1,47 @@
+using Serilog;
+using System.Net;
+using System.Net.Sockets;
+using System.Text;
+
+namespace Elisa;
+
+public static class Proxy
+{
+    static string serverUrl = "localhost";
+
+    public static async Task Start()
+    {
+        Log.Information("Starting Proxy");
+
+        TcpListener listener = new TcpListener(IPAddress.Any, 9000);
+        listener.Start();
+        Log.Information($"Proxy: Listening on port 9000");
+
+        while (true)
+        {
+            TcpClient client = await listener.AcceptTcpClientAsync();
+            string clientAddress = ((IPEndPoint)client.Client.RemoteEndPoint).Address.ToString();
+            Log.Information($"Proxy: Accepted client connection from {clientAddress}");
+
+            TcpClient server = new TcpClient();
+            await server.ConnectAsync(serverUrl, 80);
+            Log.Information($"Proxy: Connected to Elisa");
+
+            NetworkStream clientStream = client.GetStream();
+            NetworkStream serverStream = server.GetStream();
+
+            byte[] buffer = new byte[256 * 256];
+            int bytesRead;
+            while ((bytesRead = await clientStream.ReadAsync(buffer, 0, buffer.Length)) > 0)
+                Log.Information($"Received data from client: {Encoding.UTF8.GetString(buffer, 0, bytesRead).Trim()}");
+
+            Task clientToServerTask = clientStream.CopyToAsync(serverStream);
+            Task serverToClientTask = serverStream.CopyToAsync(clientStream);
+            await Task.WhenAll(clientToServerTask, serverToClientTask);
+
+            client.Close();
+            server.Close();
+            Log.Information($"Proxy: Closed client and server connections");
+        }
+    }
+}

Elisa/Utils/Time.cs

@@ -1,11 +1,5 @@
 namespace Elisa.Utils;
 
-internal static class DateTimeExtensions
-{
-    public static long ToUnixSeconds(this DateTime dateTime)
-        => (long)(dateTime - new DateTime(1970, 1, 1, 0, 0, 0, DateTimeKind.Utc)).TotalSeconds;
-}
-
 public static class Time
 {
     public static long GetTomorrowZero()
@@ -17,3 +11,9 @@ public static class Time
     public static long GetNextMonthZero()
         => new DateTime(DateTime.Now.Year, DateTime.Now.Month, 1, 0, 0, 0, DateTimeKind.Utc).AddMonths(1).ToUnixSeconds();
 }
+
+internal static class DateTimeExtensions
+{
+    public static long ToUnixSeconds(this DateTime dateTime)
+        => (long)(dateTime - new DateTime(1970, 1, 1, 0, 0, 0, DateTimeKind.Utc)).TotalSeconds;
+}