Re: Counter Strike blocker?

From: Gerry O'Brien [MVP] (gerry)
Date: 10/08/04 

Date: Fri, 8 Oct 2004 08:49:16 -0300

I wrote a windows service one time that checked the HWnd and got the app's
name from that. It would shut the app down by killing the process and run a
check every 10 to 20 seconds to see if it started back up.

I don't know if Counter Strike has a hook that you can look for but you may
want to get its process name and see of you can kill that. 

-- 
Gerry O'Brien [MVP]
Visual Basic .NET(VB.NET)
"Johan Christensson" <johan.christensson@telia.com> wrote in message 
news:%23SkKzRLrEHA.756@TK2MSFTNGP11.phx.gbl...
> Well, they have a firewall that prevents the kids from playing internet 
> games, so the problem here is localy played games.
>
> The problem get's even more severe since many of these students are 
> attending computer courses that aim to give the students a understanding 
> of network computing basics, Windows networks, AD and so on, so they know 
> a quite alot some times, and they install there own clients. This prevents 
> me to acces the computers as an Administrator, since they only join there 
> own domain. Further, this also mean that most of the kids are local 
> administrators of there own computers.
>
> My first thought was to create an application that scans for CS servers. 
> The next step would be to listen after client requests for that computer 
> and to some how block or disturbe the traffic between the client and the 
> server by sending some malformed package or just a hep of junk. A second 
> though was that this might consume a lot of network traffic, and the I 
> would be the bad guy. :D
>
> Any thought?
>
> /JCh
> "Iain Mcleod" <mcleodia@dcs.gla.ac.uk> wrote in message 
> news:%23AhhpELrEHA.3324@TK2MSFTNGP15.phx.gbl...
>> Hi Johan
>>
>> Firstly a decent setup on the school's computers would prevent the kids 
>> from loggin on with administrative privileges.  That way you could 
>> prevent them installing the game.  It may be that you are already doing 
>> this, but the kids probably know a backdoor which gives them admin privs. 
>> This is distinctly possible if you are not running the latest service 
>> packs on all the machines.  You should be doing this.
>>
>> You could write a program that searches in a known location for known 
>> counterstrike files on all the hard drives of the school machines through 
>> the c$ administrative share (the local hard drive on a machine should be 
>> viewable to network administrators through this share).  Check wherever 
>> counterstrike is installed by its setup program and what files are 
>> installed and then write a program to look for those files.
>>
>> You can also block the external traffic by installing a firewall on the 
>> gateway computer controlling the school's access to the internet.  Find 
>> out what ports counterstrike servers normally listen on.  I had a quick 
>> google and it seems that most seem to be running on ports 27015 through 
>> 27018.  Of course the port that a server is listening on is almost 
>> certainly a configuration option and there may be servers out there which 
>> are on different ports.  Blocking 27015 through 27018 would stop most of 
>> the kids from finding the common servers.
>>
>> The firewalling will not prevent the kids from playing local games on the 
>> school network between themselves though if counterstrike gives the 
>> option of running a local server for a game (I don't play it myself, so I 
>> don't know!).  Kid 1 could set up a local server and kids 2, 3 and 4 
>> could then connect in and they could play against each other.  I'm afraid 
>> the only option there would be to get some packet sniffing software and 
>> listen for traffic on the ports I mentioned above.  I've never used any, 
>> so I can't recommend any.  Chances are that the traffic would be UDP not 
>> TCP as that is what most games run on.
>>
>> Finally, it should be stressed to the kids that school policy prevents 
>> such practices and individuals caught will be severely punished etc.  It 
>> just takes a few unlucky kids to be caught and made an example and the 
>> practice should soon stop :)
>>
>> Hope that gives you some pointers to further info.
>>
>> Either that, or forget about the whole thing and join them in their 
>> games...
>>
>> Kids, eh?
>> :-)
>> Iain
>>
>>
>> "Johan Christensson" <johan.christensson@telia.com> wrote in message 
>> news:ulv5M4KrEHA.3464@TK2MSFTNGP14.phx.gbl...
>>> Hi.
>>>
>>> I got contacted by an old teacher today that works at a public shool 
>>> here in Sweden. They have a ever groving problem with the students 
>>> playing Counter Strike on the schools computers. Not only dose this pose 
>>> a problem with bandwidth usage, but the fact that the Half-Life 
>>> installations often are not licensed, and this puts the school in a 
>>> tight position. Apperently the schools IT department say that thay can't 
>>> do anything to stop it from there point of view.
>>>
>>> He asked me if I chould come up with a solution. So here is my idea:
>>>
>>> I'm not that familiar with Couter Strike, but I belive that it's a 
>>> client server setup. Would it be possible to some how make a application 
>>> that listens after CS Servers and block/jam there traffic? I want to 
>>> disturb the CS traffic but not everything else?
>>>
>>> I'm quite an experiensed programer, but in this case I have no clue 
>>> where to start. All help is apprciated.
>>>
>>> /Johan Ch
>>>
>>
>>
>
>

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