Kvaser is a project mainly written in C and SHELL, it's free.
Kvaser canlib and leaf driver
The linux developer kit from www.kvaser.com does not work well with the latest linux kernels. Also, at Eaton, we are only using the Kvaser Leaf/LeafLight, so controlling the code for all the other interfaces is unnecessary. This repo contains the 'canlib' library and 'kvaser leaf' drivers from www.kvaser.com and have been modified to build/install on the latest linux kernels (including kernel 3.0).
use the linux standard commands to build and install
$ make ... then as root ...