How to catch an incomming/outgoing connection

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1.50/5 (2 votes)

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VC7.0

C++

C#

I want to list all incomming/outgoing connection

Authorised / UnAuthorized connection both

Help me.

Posted 20-Feb-12 18:51pm

Member 8654809

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Sergey Alexandrovich Kryukov 21-Feb-12 0:53am

Not a question. And not clear.
--SA

Member 8654809 21-Feb-12 1:03am

Suppose a Novice PC user download application/song(Suppose Linkin Park album mp3), then that application/song tries to access a server or broadcast his information to an IP address.

I want to catch these kind a connection. Just alert user, if user want to diconnect. then user can disconnect.

Dave Kreskowiak 21-Feb-12 9:50am

There's no way to do this. You have no ability to determine what is and what isn't a valid connection. There's no such thing as authorized or unauthorized as every program that is launched by a user runs AS the user.

The only way to determine what a bad connection would be is to maintain a list of known-bad IP Addresses. Since this is impossible (Google for "Enumerating Badness") to maintain, you can't possibly determine what is and isn't a bad connection.

Playing an MP3 file will not try to initiate a connection to anything. Since it's just data, Media Player or anything else playing it won't just spontaneously try to create a connection. They don't execute code contained in the MP3 file.

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Ashish Tyagi 40 · Answer 1 · 2012-02-20T20:14:00

Use netstat command. It will list all connections.
These links may help.. netstat man page and netstat on windows.

But form your comment "I want to catch these kind a connection. Just alert user, if user want to diconnect. then user can disconnect.", I think a proxy or firewall software can solve your problem, try ashampoo firewall, it is free, and block whatever you want to block.

pietvredeveld · Answer 2 · 2012-02-20T23:10:00

Since you posted your question with programming language tags, I assume you what to build a program that informs the user.

To do so you can use for example (Win)PCap. It offers a api for you're program that allows you to capture / monitor the network traffic. See http://en.wikipedia.org/wiki/Pcap[^]

Regards
Piet

JackDingler · Answer 3 · 2012-02-21T02:53:00

In addition to the advice above, you need to buy TCP/IP Illustrated, Volume 1: The Protocols.

Essentially you're asking how to write a firewall and intrusion detection program. you have a wide range of protocols that you'll need to understand, as it's not as simple as just watching for connections. On a modern OS, there are lots of connections going in and out of your PC. Making sense of them is a huge task.

The netstat advice above, is a good start in getting a handle on what you're PC is already doing.

How to catch an incomming/outgoing connection

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