I am trying to find a way (either software or using terminal) to bind certain applications to my VPN interface (untun0). I have looked at every firewall solution available for OS X 7 and none of them allow me to (Icefloor, Rainroof, Little Snitch, McAfee, Norton and a few more). FW Builder I thought would help but it still lacks the ability to bind APPLICATIONS to a certain interface.
The reason I am trying to do this is because if I shut off my VPN or it drops I don't want to have to close every application that I want to run through it specifically (Google Drive, Chrome, Evernote and a few more). I just want to not be able to route through either ethernet or WIFI (en0 en1).
So the solution has to be in regards to Applications not ports (I have other browsers I use not in the VPN) or IP Addresses.
Does anyone have an idea or a way to point me in the right direction?