Question - How can I use this package to drop packets according to a filter?

[CMC01]

Hi,
I've been using Clumsy for some time to perform manual testing against a WebRTC implementation. Running these tests each release has now become a big slow down in our release process so I'm investigating whether I can use a package like this one in conjunction with Selenium to simulate a user with an inconsistent local network.

I've been playing around with the sandbox example as well as other projects you've linked which use this package but I cannot get my head around where I am going wrong- I feel I must be fundamentally misunderstanding at least part of the implementation. When debugging, it appears that WinDivertSharp is not sniffing any traffic (hence, when I try to drop traffic nothing is dropped). I've included my approach below, do you have any pointers or are there any further examples/documents I can review to further my understanding?

    public static IntPtr BlockTraffic()
    {
        string filter = "tcp";
        Console.WriteLine("About to start blocking traffic");
        var handle = WinDivert.WinDivertOpen(filter, WinDivertLayer.Network, 0 , WinDivertOpenFlags.Drop);
        return handle;
    }

    public static void UnblockTraffic(IntPtr handle)
    {
        Console.WriteLine("About to stop blocking traffic");
        WinDivert.WinDivertClose(handle);
    }

[TechnikEmpire]

Since this isn't specific to the c# code, I would recommend posting your Q on stackoverflow. The windivert author monitors certain tags.

[TechnikEmpire]

You're going to need to Marshal.GetLastWin32Error() to find the problem. Are you running as administrator?

[CMC01]

Thank you so much, I've managed to get this working now.

   using System.Runtime.InteropServices;

   ...

   IntPtr handle = NetworkUtilities.BlockTraffic();
   int error = Marshal.GetLastWin32Error();
   Console.WriteLine("The last Win32 Error was: " + error);

This returns error code 5, ie. Access is denied. Your suggestion was correct- I wasn't running the project as administrator.

Very much looking forward to using this package in our test projects from this point forwards!