How to close another socket

[Nuno Magalhaes]

How can I close another socket belonging to the same application but
all know is the IP address of the client and the port number that the
server is listening on.

Sounds like a firewall I know but I would like to know how to do it in
C#. Can anyone help me?

Thanks,
Nuno Magalhaes.

 

[Ignacio Machin \( .NET/ C# MVP \)]

Hi,

There is no way of doing that, you need to keep a reference to that
particular socket.

Even so unless you can assure that you will receive only one request from
that IP you are risking your self of closing another connections.
A TCP communication is uniquely identified by 4 values : source IP/port dest
IP/port unless you have those 4 values you can not uniquely identify it.


BTW, this is not how a firewall works, a firewall do not close a socket, it
simply intercept the package before it reach the app (in case of inbound
traffic ) if the package is not allow it just discard it.


cheers,

 

[Nuno Magalhaes]

There is a way but using the Packet Filtering API (PAPI) and C++. This
link shows it all: http://www.codeproject.com/tools/firewallpapi.asp.

I think packet filtering API comes with Microsoft Windows SDK, but I
had to move out on my programming language. It does not compensate and
I really don't need it so much after all since I can reprogram the
restrictions in my windows firewall.

 

[Ignacio Machin \( .NET/ C# MVP \)]

Hi,

Well, you would have to check the code and see how he does it, most probably
this will throw an exception in your code.

Why can't you just keep a reference to the socket in a variable?


cheers,

 

[Nuno Magalhaes]

Because I'm using Windows Media Encoder Package and SDK to broadcast
the streaming video from my webcamera. This is done automatically by
the interfaces of WMEncoder.Broadcast and the only thing I get is to
get registered on a event that is raised when a connection occurs and
all the info I get is the IP.