How to block network traffic ?

[Omega]

Hi

In serveral firewall softwares you can block network traffic quickly with
one click, can I do the same in c# ?

Thanks

[Lasse Vågsæther Karlsen]

Omega wrote:

Hi

In serveral firewall softwares you can block network traffic quickly with
one click, can I do the same in c# ?

Thanks

If you build a firewall in C#, yes.

Although I think it is possible, building the necessary driver-level
software in C or C++ would probably be a lot easier.

In any case, building a working firewall application is not an easy task
in any language. You need specific knowledge about how to hook into the
network subsystem and how to handle the flow of traffic properly at that
level.

If, on the other hand, you're asking if you can "press that button" in
the firewall software from C#, you might be able to but I doubt it.
Usually the interaction with the firewall software is only possible
through the GUI for the application so that malicious programs can't
interfere with its operation. In any case, that's probably a question
you need to ask the makers of the firewall program you want to control.

--
Lasse Vågsæther Karlsen
http://www.vkarlsen.no/
mailto:la***@vkarlsen.no
PGP KeyID: 0x2A42A1C2

[Tim Haughton]

"Lasse Vågsæther Karlsen" <la***@vkarlsen.no> wrote in message
news:On**************@TK2MSFTNGP12.phx.gbl...

If, on the other hand, you're asking if you can "press that button" in
the firewall software from C#, you might be able to but I doubt it.
Usually the interaction with the firewall software is only possible
through the GUI for the application so that malicious programs can't
interfere with its operation.

You'd think that was true. But I'm convinced that my Bit Torrent client (or
is it eMule) can programmtically open a port on the Windows firewall. I
didn't think much to it at the time, I just clicked yes so I could get my
Battlestar Galactica fix. But now you come to mention it....:)

Windows may have prompted me to allow or refuse the change, I can't
remember.

--
Regards,

Tim Haughton

Agitek
http://agitek.co.uk
http://blogitek.com/timhaughton

[Willy Denoyette [MVP]]

"Lasse Vågsæther Karlsen" <la***@vkarlsen.no> wrote in message
news:On**************@TK2MSFTNGP12.phx.gbl...

Omega wrote:

Hi

In serveral firewall softwares you can block network traffic quickly with
one click, can I do the same in c# ?

Thanks

If you build a firewall in C#, yes.

Although I think it is possible, building the necessary driver-level
software in C or C++ would probably be a lot easier.

In any case, building a working firewall application is not an easy task
in any language. You need specific knowledge about how to hook into the
network subsystem and how to handle the flow of traffic properly at that
level.

If, on the other hand, you're asking if you can "press that button" in the
firewall software from C#, you might be able to but I doubt it. Usually
the interaction with the firewall software is only possible through the
GUI for the application so that malicious programs can't interfere with
its operation. In any case, that's probably a question you need to ask the
makers of the firewall program you want to control.

--
Lasse Vågsæther Karlsen
http://www.vkarlsen.no/
mailto:la***@vkarlsen.no
PGP KeyID: 0x2A42A1C2

Note that you can't build drivers using C#.

Willy.