Control outbound access on a per-application level

[Gustav Svensson <gurra16@spray.se>]

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Is it possible to set "outbound" rules based on what binary application it is that
wants to access the Internet?
Just like what I'm used to when I run win32. In every firewall application there, I
get a message when some program is trying to access the internet. Then I can decide
whether to procede the action, or block it. On Linux I see nothing like this.
I'm having a concern with the RealPlayer. I would like to block it to reach any other
addresses but those to my favourite stations.
Sure, I could set up a rule for the port that RealPlayer is supposed to use, but what
guarantee do I have that it isn't capable of using some other port, like 80 for example?
Assume it does use the port 80. Then it would be imposible to stop without a rule like
mentioned here. Because I would want Galeon to have access to any address on port 80,
so I have to leave it wide open. It would be better if I could allow this privilege to
Galeon only, not to any program that uses port 80. Is this feasible, if so how?

Gustav
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