Change route from suid script?

[Jon Kaare Hellan <Jon.Hellan@item.ntnu.no>]

I've got ppp interfaces defined for the workplaces of me and my wife,
and use a small script to switch the default route to the interface
that needs to be active.

This works, but I have to be root. I've tried to make the script
suid/guid root, but get a SIOC.... error message from /sbin/route.

I would prefer not to have to be root to choose the default
route. Embedding the commands to /sbin/route in a suid/guid C-program
works. Is there another workaround?

Jon