Adding the support for WINDIVERT_LAYER_NETWORK_FORWARD

[cyberclau]

Hi,

In the officiel/actual version, only the WINDIVERT_LAYER_NETWORK is supported/used. That restricts the utilization of Clumsy when only forwarding the packet (layer: WINDIVERT_LAYER_NETWORK_FORWARD) on the machine (ex: Internet Connection Sharing in Windows).

My need was to use a Windows PC to simulate a WAN link to a physical firewall. The Windows PC was sharing an Internet connexion with the use of Windows ICS functionality.

The only modification I needed in Clumsy to make it work was:
int divertStart(const char *filter, char buf[]) {
int ix;
//divertHandle = WinDivertOpen(filter, WINDIVERT_LAYER_NETWORK, DIVERT_PRIORITY, 0);
divertHandle = WinDivertOpen(filter, WINDIVERT_LAYER_NETWORK_FORWARD, DIVERT_PRIORITY, 0);

I think a "nice" combo BOX can be added to the Clumsy GUI for choosing between both layer.
What do you think?

Regards,

Claude-Olivier

[cyberclau]

I forgot to mention two points:

1. The code modification is only mandatory in \clumsy-master\src\divert.c line 83.
2. I used the filter “true” when testing. I did the same as what is shown when running “\clumsy-master\external\WinDivert-2.2.0-C\x64\flowtrack.exe”

Regards,

Claude-Olivier

[jagt]

Hi! You're welcome to file for a pull request.
See build instructions here: https://jagt.github.io/clumsy/download.html