Is there an API for ipfw?

Hi!

I'm writing an application that, needs to be able to quickly alter the
bandwidth between another machine and the host.

The only way I can do that -- without another machine's cooperation -- is by
using the firewall, such as the dummynet functionality of ipfw.

Is there any way to create/alter such a pipe from a C-program without using
system("ipfw ....")?

If not ipfw, perhaps, other firewall modules in FreeBSD-6.x?

Thanks a lot!

-mi

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