#!/bin/sh
# iTalc client launcher using avahi
# Written by Stéphane Graber <stgraber@ubuntu.com>

ICA_LTSP=`xprop -root ica_ltsp | sed 's/^.* //' 2> /dev/null`
if [ "$ICA_LTSP" = "1" ]
then
    echo "ICA already running on the thin client."
    exit 0
fi

CONFIGFILE="/etc/sysconfig/italc2.conf"

# Provide a configuration file to enable switching off client autodetection
# and/or specifying user-defined ports.
if [ -f "$CONFIGFILE" ]
then
    . $CONFIGFILE
fi

AVAHIPUBLISHSERVICE="/usr/bin/avahi-publish-service"

PUBLISH_CLIENT=${PUBLISH_CLIENT:-True}

# Set default ports
ICAPORTDEF=11100
ICAFIRSTPORT=${ICAFIRSTPORT:-$ICAPORTDEF}

HOSTNAME=`hostname`
MD5_3=`md5sum @SYSCONFDIR@/@PACKAGE@/@KEYSDIRNAME@/@PUBKEYSDIRNAME@/@TEACHERROLENAME@/key 2> /dev/null | awk '{print \$1}'`
MD5_2=`md5sum @SYSCONFDIR@/@PACKAGE@/@KEYSDIRNAME@/@PUBKEYSDIRNAME@/@ADMINROLENAME@/key 2> /dev/null | awk '{print \$1}'`
MD5_1=`md5sum @SYSCONFDIR@/@PACKAGE@/@KEYSDIRNAME@/@PUBKEYSDIRNAME@/@SUPPORTERROLENAME@/key 2> /dev/null | awk '{print \$1}'`

if [ -n "$1" ]; then
    ROLE=$1
fi

if [ -z "$ROLE" ]; then
    ROLE="other"
fi

# Get session number
SESSION=`echo $DISPLAY | sed -r 's/^.*:([0-9]+)(|[^0-9].*)$/\1/'`

if [ -n "$LTSP_CLIENT" ]
then
    echo LTSP environement detected
    PORT=`echo $LTSP_CLIENT | awk -F . '{print \$4}'`
    # Not much point in using the ports from /etc/sysconfig/italc2.conf for thin clients
    ICAPORT=$((($SESSION + 112) * 100 + $PORT))
    HOSTNAME=${LTSP_CLIENT_HOSTNAME:-$HOSTNAME}
else
    ICAPORT=$(($ICAFIRSTPORT + $SESSION))
fi

# Create script for awk
# First pattern
AWKSCRIPT='($1 ~ /^[0-9]+$/)'

# Add pattern for -port
AWKSCRIPT="$AWKSCRIPT"' && (/[[:space:]]-port[[:space:]]+'$ICAPORT'([[:space:]]|$)/'
if [ "$ICAPORT" = "$ICAFIRSTPORT" ];
then
AWKSCRIPT="$AWKSCRIPT"' || ! /[[:space:]]-port[[:space:]]/'
fi
AWKSCRIPT="$AWKSCRIPT"')'

# Add action: print PID only
AWKSCRIPT="$AWKSCRIPT"' {print $1}'

RUNNING_ICA=`ps -C ica -o pid,command | gawk --source "$AWKSCRIPT" | sort -bg`
if [ -n "$RUNNING_ICA" ]
then
    for processus in $RUNNING_ICA
    do
        kill $processus
    done
    echo ICA already running, killing it.
    sleep 1s
fi

if [ "$PUBLISH_CLIENT" = "True" ] && [ -f $AVAHIPUBLISHSERVICE ] && [ ! -f /etc/ltsp/getltscfg-cluster.conf ]
then
    echo Announce the service on avahi
    $AVAHIPUBLISHSERVICE "italc $USER" _italc._tcp $ICAPORT $MD5_1 $MD5_2 $MD5_3 "$HOSTNAME" > /dev/null &
fi

echo Starting ICA
# Store the port in an xprop, for italc-launcher to find it
xprop -root -f ICA_PORT 16c -set ICA_PORT $ICAPORT
#ica -noshm -port $ICAPORT -role $ROLE 2> /dev/null
echo ica -noshm -port $ICAPORT -role $ROLE
ica -noshm -port $ICAPORT -role $ROLE
xprop -root -remove ICA_PORT

if [ "$PUBLISH_CLIENT" = "True" ] [ -f $AVAHIPUBLISHSERVICE ] && [ ! -f /etc/ltsp/getltscfg-cluster.conf ]
then
    echo Stopping avahi
    kill `ps -C "avahi-publish-service italc $USER _italc._tcp $ICAPORT" -o pid=`
fi