Java Firewall

[news.tele2.dk]

Hi, I was wondering if it is possible to make your own firewall in java? Any
clues?

 

[Roedy Green]

Hi, I was wondering if it is possible to make your own firewall in java? Any
clues?

To be a firewall, you have to intercept all socket traffic. You would
need at least some JNI to hook into your OS firewall hooks.

See http://mindprod.com/jgloss/jni.html

 

[Matt Humphrey]

Hi, I was wondering if it is possible to make your own firewall in java? Any
clues?

I don't think so. A good firewall must really block things at the OS level.
In addition, Java does not directly access ICMP and so could not setup rules
for these messages. I think any Java firewall would require heavy JNI
support for the actual work. Java might make a good front-end however for
something like the Linux ipchains.

Cheers,
Matt Humphrey (e-mail address removed) http://www.iviz.com/