Warn on unsupported OS versions

Core/LocalAdmin.cs

@@ -4,6 +4,7 @@
 using LocalAdmin.V2.IO.ExitHandlers;
 using System;
 using System.Collections.Concurrent;
+using System.ComponentModel;
 using System.Diagnostics;
 using System.Globalization;
 using System.IO;
@@ -521,6 +522,7 @@ internal async Task Start(string[] args)
 
             if (_firstRun)
             {
+                VerifySystemVersion();
                 try
                 {
                     SetupExitHandlers();
@@ -619,6 +621,69 @@ private static void Menu()
         ConsoleUtil.WriteLine(string.Empty, ConsoleColor.Cyan);
     }
 
+	[StructLayout(LayoutKind.Sequential)]
+	private unsafe struct OSVERSIONINFO
+	{
+		public uint dwOSVersionInfoSize;
+		public uint dwMajorVersion;
+		public uint dwMinorVersion;
+		public uint dwBuildNumber;
+		private uint dwPlatformId;
+		public fixed ushort szCSDVersion[128];
+		public ushort wServicePackMajor;
+		public ushort wServicePackMinor;
+		private ushort wSuiteMask;
+		public byte wProductType;
+		private byte wReserved;
+	}
+
+    private static unsafe void VerifySystemVersion()
+    {
+        try
+        {
+            if (OperatingSystem.IsWindows())
+            {
+		        OSVERSIONINFO info = new()
+		        {
+			        dwOSVersionInfoSize = (uint) sizeof(OSVERSIONINFO)
+		        };
+
+                uint status = GetWindowsVersion(&info);
+			    if (status != 0)
+				    throw new Win32Exception(NtStatusToErrorCode(status));
+                Version windows = new((int) info.dwMajorVersion, (int) info.dwMinorVersion, (int) info.dwBuildNumber);
+
+                Version minimumWindows = new(10, 0, 19043); // Windows 21H1+
+                if (windows < minimumWindows)
+                {
+                    ConsoleUtil.WriteLine($"Unsupported Windows version! SCPSL servers require Windows 21H1+ (build 19043+) and your server has {windows}!", ConsoleColor.Red);
+                }
+                return;
+
+                [DllImport("ntdll", EntryPoint = "RtlGetVersion")]
+                static extern uint GetWindowsVersion(OSVERSIONINFO* lpVersionInformation);
+
+                [DllImport("ntdll", EntryPoint = "RtlNtStatusToDosError")]
+                static extern int NtStatusToErrorCode(uint status);
+            }
+
+            Version glibc = Version.Parse(Marshal.PtrToStringUTF8((nint) GetGlibcVersion()));
+
+            Version minimumGlibc = new(2, 35); // Ubuntu 22.04
+            if (glibc < minimumGlibc)
+            {
+                ConsoleUtil.WriteLine($"Unsupported Linux version! SCPSL servers require Ubuntu 22.04+ (glibc 2.35) while your distro is based on glibc {glibc}!)", ConsoleColor.Red);
+            }
+
+            [DllImport("libc", EntryPoint = "gnu_get_libc_version")]
+            static extern sbyte* GetGlibcVersion();
+        }
+        catch (Exception ex)
+        {
+            ConsoleUtil.WriteLine($"Failed to check the OS version: {ex.Message}", ConsoleColor.Red);
+        }
+    }
+
     private static void SetupExitHandlers()
     {
         ProcessHandler.Handler.Setup();

LocalAdmin V2.csproj

@@ -6,6 +6,7 @@
         <TargetFramework Condition="!$(RuntimeIdentifier.StartsWith('win', StringComparison.OrdinalIgnoreCase))">net8.0</TargetFramework>
         <ApplicationManifest>app.manifest</ApplicationManifest>
         <LangVersion>10</LangVersion>
+        <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
         <Nullable>enable</Nullable>
         <RootNamespace>LocalAdmin.V2</RootNamespace>
         <AssemblyName>LocalAdmin</AssemblyName>

app.manifest

@@ -13,12 +13,6 @@
   <compatibility xmlns="urn:schemas-microsoft-com:compatibility.v1">
     <application>
 
-      <!-- Windows 7 -->
-      <supportedOS Id="{35138b9a-5d96-4fbd-8e2d-a2440225f93a}" />
-
-      <!-- Windows 8.1 -->
-      <supportedOS Id="{1f676c76-80e1-4239-95bb-83d0f6d0da78}" />
-
       <!-- Windows 10 -->
       <supportedOS Id="{8e0f7a12-bfb3-4fe8-b9a5-48fd50a15a9a}" />