Some QoL improvements:

- Disable dev mode on IPv6 or unreachable game portal host names.
- Print the client build and path on launcher start.
- Disable anti crash feature when dev/custom file/static auth seed modes are disabled.
  This restores the original client side security features when using external hosts.

src/Launcher.cs

@@ -152,6 +152,14 @@ static class Launcher
 
                     // Build the version URL from the game binary build.
                     var clientVersion = GetVersionValueFromClient(appPath);
+
+                    Console.ForegroundColor = ConsoleColor.Yellow;
+                    Console.WriteLine();
+                    Console.WriteLine($"Client Build {clientVersion}");
+                    Console.WriteLine($"Client Path '{appPath}'");
+                    Console.WriteLine();
+                    Console.ResetColor();
+
                     byte[] versionPatch = Patches.Common.GetVersionUrl(clientVersion.Build);
 
                     // Refresh the client data before patching.
@@ -187,7 +195,17 @@ static class Launcher
 
                     NativeWindows.NtResumeProcess(processInfo.ProcessHandle);
 
-                    WaitForUnpack(ref processInfo, memory, ref mbi, gameAppData);
+                    var antiCrash = false;
+
+                    // Enable anti crash in dev mode, custom file mode or static auth seed mode.
+#if CUSTOM_FILES
+                    antiCrash = true;
+#else
+                    antiCrash = commandLineResult.HasOption(LaunchOptions.UseStaticAuthSeed) ||
+                                commandLineResult.GetValueForOption(LaunchOptions.DevMode) && LaunchOptions.IsDevModeAllowed;
+#endif
+
+                    WaitForUnpack(ref processInfo, memory, ref mbi, gameAppData, antiCrash);
 
 #if x64
                     if (clientVersion is (1, >= 14, _, _) or (3, 4, <= 1, _) or (9, _, _, _) or (10, <= 1, _, _) and not (10, 1, 5, _))
@@ -321,7 +339,7 @@ static class Launcher
 #endif
     }
 
-    static void WaitForUnpack(ref ProcessInformation processInfo, WinMemory memory, ref MemoryBasicInformation mbi, Stream gameAppData)
+    static void WaitForUnpack(ref ProcessInformation processInfo, WinMemory memory, ref MemoryBasicInformation mbi, Stream gameAppData, bool antiCrash)
     {
 #if x64
         // Wait for client initialization.
@@ -356,7 +374,8 @@ static class Launcher
         while (memory?.Read(virtualTextSectionEnd, 1)?[0] == null || memory?.Read(virtualTextSectionEnd, 1)?[0] == textSectionEndValue)
             Thread.Sleep(100);
 #endif
-        PrepareAntiCrash(memory, ref mbi, ref processInfo);
+        if (antiCrash)
+            PrepareAntiCrash(memory, ref mbi, ref processInfo);
 
         memory.RefreshMemoryData((int)mbi.RegionSize);
     }

src/Misc/Helpers.cs

@@ -2,6 +2,7 @@
 // Licensed under the MIT license. See LICENSE file in the project root for full license information.
 
 using System.Net;
+using System.Net.Sockets;
 
 namespace Arctium.WoW.Launcher.Misc;
 
@@ -69,14 +70,23 @@ static class Helpers
         var ipSpan = colonIndex != -1 ? portalSpan[..colonIndex] : portalSpan;
         var portalString = ipSpan.ToString().Trim();
 
-        if (IPAddress.TryParse(portalString, out var ipAddress))
-            return ipAddress.ToString().AsSpan();
+        try
+        {
+            if (IPAddress.TryParse(portalString, out var ipAddress))
+                return ipAddress.ToString().AsSpan();
 
-        var ipv4Address = Dns.GetHostAddresses(portalString).FirstOrDefault(a => a.AddressFamily == System.Net.Sockets.AddressFamily.InterNetwork);
+            var ipv4Address = Dns.GetHostAddresses(portalString).FirstOrDefault(a => a.AddressFamily == System.Net.Sockets.AddressFamily.InterNetwork);
 
-        if (ipv4Address == null)
-            throw new Exception("No IPv4 address found for the provided hostname.");
+            if (ipv4Address == null)
+                throw new Exception("No IPv4 address found for the provided hostname.");
 
-        return ipv4Address.ToString().AsSpan();
+            return ipv4Address.ToString().AsSpan();
+        }
+        catch (SocketException)
+        {
+            Console.WriteLine("No valid portal found. Dev (Local) mode disabled.");
+
+            return string.Empty.AsSpan();
+        }
     }
 }

src/Program.cs

@@ -15,7 +15,8 @@ LaunchOptions.RootCommand.SetHandler(context =>
 {
     CreateDevIPFilter(out var ipFilter);
 
-    var appPath = Launcher.PrepareGameLaunch(context.ParseResult, ipFilter);
+    // Prefer / instead of \ for the client path.
+    var appPath = Launcher.PrepareGameLaunch(context.ParseResult, ipFilter).Replace("\\", "/");
     var gameCommandLine = string.Join(" ", context.ParseResult.UnmatchedTokens);
 
     // Add config parameter to the game command line.