Hello list !

It may sound noobish but is there a way to filter traffic based on regular
expression matching ?

My os is Centos 5 and i'm currently using shorewall 3.4.2-6 installed from
rpm.

The issue i have is that yahoo messenger keeps using nonstandard ports to
connect. Lately i blocked yahoo messenger and it connects to port 25 to
get outside the corporate network. I could block the ssl port but it will
break ssl sites and i need to block only certain hosts that it connects
to. Regular expression matching of hostnames that the application connects
to will help me get this policy working whatever ports will this
application use, i guess.

I use a local http proxy but the messenger application gets around it
because i allow mail ports (25, 143, 101) to access the internet from the
lan.

Any suggestions will be appreciated !


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