Firewall that can filter by source port?

Hi,
I have looked everywhere but can't find a firewall for OSX that will allow me to filter incoming or outgoing connections by source port. Just about every one I find can filter by destination port.
Can anyone help me on this?
Thank you in advance

Whoop!
Thanks for that. That really helped. I don't suppose
you could point me in the direction of a tutorial
that will allow me to do what I need?
Hmmm.
No tutorials that I can personally reccomend. (I actually use iptables on linux for my firewall needs)
http://www.novajo.ca/firewall.html looks ok.
There is a lot of good info on macosxhints, as well, especially on creating the startup script you will need to create.
Hopefully someone else has a good link to a tutorial.
Also, brickhouse may do what you need, but it didn't look as if it was quite as configurable as you wanted....

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