Note, that this recipe is not updated long time and could be outdated!
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Datorlaika ierobežošana

Šajā lapā ir aprakstīts, kā veikt datora lietošanas ierobežošanu, izmantojot standarta Linux komandas un Bash skriptu.
  1. Izveido /home/bin failu ar sekojošu saturu:

    #!/bin/bash
    # warning shown to user
    warning="Tavs datorlaiks beigsies pēc 1 minūtes!"
    # Ja pēc tam nerādās pieteikšanās logs, spied: \
    # Ctrl+Alt+F7 vai F8, F9, utt."
    # depending on crontab, set amount of time which should be added
    addtime=2

    # Get user, who runs xwindow session (assuming only one simultaneous X window user)
    who=$(who|grep -E "tty([7-9]|1[0-2])"|head -n1) # user info
    user=$(echo $who|cut -d" " -f1)   # current user
    if [ -z "$user" ];then
        user="nobody"
    fi
    #user="ada" # for testing only !!
    #term=$(echo $who|cut -d"(" -f2|cut -d")" -f1) # current terminal
    term=$(echo $who|awk '{print $2}') # current terminal
    cdate=$(date +"%F")
    # time for user logged in before
    daytime=$(grep -aE "^$cdate.*user:$user.*daytime:[0-9]+$" /var/log/timeout.log|tail -n1|awk -F "daytime:" '{print $2}'|awk '{print $1}')

    # Calculate total daytime
    daytime=$(expr $daytime + $addtime)

    check=true
    daylimit=120
    if [ "$(echo $user|grep -E 'nobody|ieva|odo|valdis')" != "" ]; then
        check=false
    fi

    if [ "$(echo $user|grep -E 'ubuntu')" != "" ]; then
        daylimit=1
    fi

    message="$(date +'%F %T') user:$user term:$term daytime:$daytime"
    # for debbuging purposes only:
    #echo addtime:$addtime
    #echo who:$who
    #echo user:$user
    #echo term:$term
    #echo cdate:$cdate
    #echo daytime: $daytime
    #echo check: $check
    #echo $message
    #exit 0

    if [ $check == true ]; then
    if [ $daytime -gt $daylimit ]; then
    message="$message, Limit exceeded"
    #export DISPLAY=$term
    export DISPLAY=:0.0 # assuming only one Xterm session
    #su - $user -c "/usr/bin/xmessage -display :0.0 -center \"$warning\" &" # old school, doesnt support UTF8
    su -c "zenity --warning --text=\"$warning\"" $user 2>/dev/null & # dialog window
    #su $user -l -c "notify-send -u critical \"$warning\" &" # notification
    sleep 60
    # check if banned user session is still active
    user1=$(who|grep -E "tty([7-9]|1[0-2])"|head -n1|cut -d" " -f1)
    # and kill it, if necessary
    if [ "$user1" == "$user" ]; then
    #/etc/init.d/gdm restart # doesn't work
    /sbin/restart lightdm  # get off user from session by restarting xwindow manager
    /etc/init.d/lightdm restart # get off user from session by restarting xwindow manager
    message="$message, logged off"
    fi
    fi
    fi

    # Log
    echo $message >> /var/log/timeout.log
    exit 0
  2. Padara failu izpildāmu ar komandu:

    sudo chmod +x /home/bin/check-timeout
  3. Pēc vajadzības izmaina lietotāju vārdus un citus parametrus skriptā.
  4. Pievieno crontab uzdevumu:

    sudo crontab -e
  5. Redaktorā pievieno sekojošu rindu:

    */2 * * * * /home/bin/check-timeout
  6. Skripta darbību var pārbaudīt, skatot žurnāla failu /var/log/timeout.log:

    ...
    2013-06-01 20:04:01 user:audris term::0 daytime:88
    2013-06-01 20:06:01 user:audris term::0 daytime:90
    2013-06-01 20:08:01 user:audris term::0 daytime:92, Limit exceeded, logged off
    2013-06-01 20:10:01 user:nobody term: daytime:40
    2013-06-01 20:12:01 user:karlis term::0 daytime:42
    2013-06-01 20:14:01 user:karlis term::0 daytime:44
    2013-06-01 20:16:01 user:karlis term::0 daytime:46

    ...

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Created by Valdis Vītoliņš on 2008-08-09 17:24
Last modified by Valdis Vītoliņš on 2016-07-15 19:03
 
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