[K12OSN] Redirecting sound using esd (fun stuff)

[John Lucas]

Robert Arkiletian wrote:
> Just thought I would share a cool learning experience with the list.
> 
> Today one of my students played a youtube video (with sound) on his
> client computer which did NOT have speakers. He did it by redirecting
> the sound esd stream to another client computer which did have
> speakers. Here's how he did it.
> 
> $esdmon -s source_hostname  | esdcat > esdrec -s dest_hostname
> 
> Of course, it works for more than just youtube. You can also redirect
> things like ogg123 -d esd song.ogg
> 
> You can even eavesdrop on other students by redirecting (copying in
> this case) their sound stream to yourself. Pretty sneaky.
> 
> BTW I'm still using k12ltsp 4EL (ltsp 4.1) Does this hack work on ltsp 4.2 or 5?
> 

It can be made to work in 4.2, but you may also be aware that this 
"feature" is ripe for abuse; students randomly redirecting sound all 
through the lab, disrupting legitimate activities etc. A very noisy DOS 
attack.

-- 
         "History doesn't repeat itself; at best it rhymes."
                         - Mark Twain

| John Lucas                MrJohnLucas at gmail.com               |
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