BFD for FreeBSD?

[Bashar]

I was looking for a BFD to install on by freebsd boxes, and found this 
nice script http://nullmind.com/2005/02/03/brute-force-detection-linuxbsd/

just wondering is that the best script around for freebsd that replaces 
http://www.rfxnetworks.com/bfd.php for linux?
or there is another apf+bfd combination for freebsd like 
http://www.rfxnetworks.com/bfd.php and 
http://www.rfxnetworks.com/apf.php replacement?


Thanks.