Comment by JetSetIlly

I wrote a program similar to this for AmigaOS many, many years ago. I would have been inspired by ZoneAlarm or a program like it.

I've just found it and uploaded it to github. Looking at the code, I can see my horrible C style of the time. There's probably bugs galore.

https://github.com/JetSetIlly/Direwall

If I remember correctly, it runs as a commodity and patches the socket library. Interestingly, the socket library was not re-entrant (unusual for Amiga libraries) so I had to patch the Exec OpenLibrary() function to monitor the loading of new copies of the socket library. But it's been a long time so memories are hazy.

It'll be interesting to see if it is still compiles and runs for modern AmigaOS, if any active Amiga programmers are around to see.