IRC chat logs for #ltsp on irc.libera.chat (webchat)
Channel log from 21 March 2010 (all times are UTC)
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| 01:38 | <alkisg> Hmm I'll write my thoughts here in case anyone can help.
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| 01:38 | I want to develop a way for the "teacher" to send commands to LTSP clients and users.
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| 01:38 | I don't want to install sshd on the clients; I want the users commands to run as part of their sessions, so I need a daemon.
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| 01:38 | To keep the RAM requirements low, both the client daemon and the users daemon will be just:
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| 01:38 | nc server 12345 -e sh 2>&1
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| 01:38 | Now what I'm not sure how to do is the server part. I think the best way to implement this would be to map each connection to a socket:
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| 01:38 | /var/run/ltsp-control-server/user51_ltsp123.socket
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| 01:38 | Then the teacher could just write a command to that socket to execute it on the clients, and read the socket to get the command output. I think it may even
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| 01:38 | be possible to use the socket as a pseudotty and connect an xterm to it.
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| 01:38 | Well the question is, how would I implement the server part? inetd? socat? C? :)
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| 01:57 | <moldy> alkisg: why not python?
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| 01:57 | <alkisg> moldy: for the server part? sure, np...
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| 01:58 | I just don't want python in the client part, to keep the ram requirements low (i.e.64 ram for TCs)
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| 02:00 | <moldy> i see
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| 02:00 | <alkisg> Maybe socat is able to handle all the server part without any need for scripts - except for some initialization...
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| 02:00 | <moldy> well, if all else fails, you can always resort to c ;)
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| 02:00 | i haven't used socat yet
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| 02:00 | <alkisg> I think `nc server 12345 -e sh 2>&1` for the clients is good enough - I don't think we need anything more, and it only needs 3-4 MB RAM
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| 02:01 | Sure, but learning how to program C sockets would ruin all my deadlines :D
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| 02:01 | In essense, all I need is a redirection from a client /bin/sh to a server file-socket
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| 02:03 | <moldy> security is not an issue?
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| 02:03 | <alkisg> No, that channel will only be used for commands
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| 02:03 | I.e. open this web page, delete files, poweroff etc
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| 02:04 | It'll be "declared" as non-safe in the docs :)
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| 02:04 | But as it uses reverse connections (the client connects to the server) at least it's difficult to exploit it
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| 02:06 | It'll also enable instant client discovery, no need for the teacher app to search for TCs or connected users... they'll all be available as sockets
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| 02:07 | (for the users, nc will run from /etc/xdg/autostart from within the user session on the server, so no security issue there)
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| 02:09 | <moldy> hm, yup
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| 02:09 | <alkisg> (and for fat clients, a reverse port forwarding will be used within the same ssh channel that's used for login, so again, no security issue there - it's only "unsafe" for TC controlling)
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| 06:46 | <alkisg> Heh, socat might even not be needed - bash `exec 3<>/dev/tcp/server/1234` should suffice :)
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| 10:32 | <alkisg> If I have root access on the clients, how would I turn off the speaker temporarily, so that the students couldn't turn it on themselves?
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| 10:33 | Erm, I mean the volume, not the speaker
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| 18:23 | <map7> I've been having trouble getting my new thin client working with it's graphics card. It will not boot up into the GUI without me setting XSERVER='vesa'
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| 18:23 | I've got a Intel GMA950 chipset, id: [8086:2772] (rev 02)
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| 18:24 | Where can I find the X log files for the client?
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| 21:34 | robbie is now known as Guest87902 | |
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| 21:35 | eibbor is now known as robby | |
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| 21:38 | <rob123> hi jammcq
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| 21:38 | long time no irc
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| 21:38 | (its robbie)
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| 21:41 | <jammcq> robbie ?
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| 21:41 | hey mate
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| 21:41 | <rob123> hey there
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| 21:41 | <jammcq> wow, what's going on?
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| 21:41 | <rob123> having a samba problem
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| 21:41 | ltsp was on my auto join list
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| 21:41 | <jammcq> heh
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| 21:42 | i figure you've got a house full of kids by now
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| 21:42 | <rob123> hows chicago ?
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| 21:42 | well 2
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| 21:42 | or are you in detroit ?
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| 21:42 | <jammcq> well, that can seem like a house full sometimes
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| 21:42 | I'm near detroit
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| 21:42 | <rob123> 2 boys sounds like a house full
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| 21:42 | <jammcq> about 30 miles north-west of it
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| 21:43 | <rob123> http://www.stanford.com.au/phpigal/images/popup.php?folder=%2F1003&filename=P1010315.JPG
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| 21:43 | the tribe
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| 21:43 | <jammcq> wow
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| 21:43 | teaching them to play hockey ?
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| 21:43 | heh, do they even HAVE hockey down there?
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| 21:44 | <rob123> they do
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| 21:44 | theat was their first time on ice
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| 21:44 | we have 1 ice skating rink in this area
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| 21:44 | <jammcq> cool. it's near the end of summer, eh?
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| 21:44 | <rob123> and a wet one at that
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| 21:45 | we dont get enough cold to ice up the lakes though
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| 21:45 | wheres mistik1?
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| 21:45 | <jammcq> dunno. haven't seen him in quite a while
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| 22:22 | <rob123> jammcq: cya, dont forget if you are ever in .au let me know
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