Blocking application port

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May 2nd, 2009, 10:08 AM
csienke

Blocking application port

Hello,

can somebody tell me please how to close an existing application port? I wolud like to write a program that blocks the packets of an application, if the application is not digitaly signed.
I used EnumProcess and now I have a list with the .exe paths and PIDs (process id-s) too.

Thank you in anticipation for any help.
May 3rd, 2009, 11:09 AM
xander_tan

Re: Blocking application port

Quote:

Originally Posted by csienke

Hello,

can somebody tell me please how to close an existing application port? I wolud like to write a program that blocks the packets of an application, if the application is not digitaly signed.
I used EnumProcess and now I have a list with the .exe paths and PIDs (process id-s) too.

Thank you in anticipation for any help.

Hi there, what you want to do is actually making a "firewall-like" application. I read this article in codeproject (sometimes ago) that you might be interested: http://www.codeproject.com/KB/IP/FwHookDrv.aspx
May 3rd, 2009, 02:05 PM
csienke

Re: Blocking application port

Hi, thank you for the link. I tried out the source code, but unfortunately it doesn't work with Vista :(
I tried it out on one pc with two applications that communicate on a specified port.

Is there any solution to block packet sending in C++ under Vista?
May 3rd, 2009, 07:13 PM
xander_tan

Re: Blocking application port

Quote:

Originally Posted by csienke

Hi, thank you for the link. I tried out the source code, but unfortunately it doesn't work with Vista :(
I tried it out on one pc with two applications that communicate on a specified port.

Is there any solution to block packet sending in C++ under Vista?

Maybe you could try to use Windows Filtering Platform (WFP), this is the link: http://www.microsoft.com/whdc/device/network/wfp.mspx

I never tried this before though.