[C#] need help，WinDivertHelperCalcChecksums Not modify of packet check bits and length bits

[boyyao]

code like：
IntPtr handle = WinDivertMethods.WinDivertOpen(Filter, WINDIVERT_LAYER.WINDIVERT_LAYER_NETWORK, -1, 0);
byte[] buffer = new byte[MAXBUF];
while (true)
{
Array.Clear(buffer, 0, buffer.Length)；
if (WinDivertMethods.WinDivertRecv(handle, buffer, MAXBUF, ref windivert_ADDRESS, ref packetLen))
{
fixed (byte* buffer_fixed = buffer)
{
WinDivertMethods.WinDivertHelperParsePacket(buffer_fixed, packetLen, &IPHDR, null, null, null, &TCPHDR, null, &ppData, null);
..........some code...
string data = Marshal.PtrToStringAnsi((IntPtr)((void*)ppData));
if(date.contains("need Modify data"))
{
byte[] newbody = System.Text.Encoding.ASCII.GetBytes("i'm is new data");
//use new data modify raw data ，，40byte is tcp/ip head
Buffer.BlockCopy(newbody, 0, buffer, 40, newbody.Length);

//redefinition packetLen to newdata + 40byte head
packetLen = (uint)newbody.Length + 40;

}
}
}
//....invalid....... buffer not modify ?????????????????
WinDivertMethods.WinDivertHelperCalcChecksums(buffer, packetLen, 0UL);

}

wait for your help thx......

[TechnikEmpire]

Where are you getting C# code from? Another repo? Or did you write it?

[boyyao]

thx for reply...
i use https://github.com/TechnikEmpire/DivertPInvoke for windivert in C#

[TechnikEmpire]

@boyyao Then open tickets on that repo. As you can plainly, easily see, the diver pivoke project is not created/run/maintained by the same person as WinDivert itself. You're cross posting and bugging people who can't even help you.

[boyyao]

I'm very sorry, because I'm in a hurry. And think there are more people here.

[TechnikEmpire]

Sure but they're following a C repository not a c# one and most of them have never heard of my wrappers anyway.

[boyyao]

Your wrappers is very good. It's very suitable for a novice like me. Thank you for your Class. I tried Divert.Net before, but x86 compiled the error.

[basil00]

This issue is handled here: TechnikEmpire/DivertPInvoke#5

In general, issues posted here should only relate to the core WinDivert driver and libraries. If you are using a wrapper, then please report the issue to the wrapper's maintainer.