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novnc-desktop-agent.sh
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novnc-desktop-agent.sh
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#!/bin/bash
set -e
# -----------------------------------------------------------------------------
# NOVNC-DESKTOP-AGENT
# -----------------------------------------------------------------------------
# Github: https://github.com/emrahcom/novnc-desktop-agent
# Dependencies: x11vnc, websockify, yad
#
# -----------------------------------------------------------------------------
NOVNC_SERVER="172.17.17.48"
# -----------------------------------------------------------------------------
# Messages
# -----------------------------------------------------------------------------
TITLE="noVNC Desktop Agent"
MSG_CLOSE_OLD="There is an already running instance and it will be terminated.\nDo you want to continue?"
MSG_SHARE="Do you want to share your desktop?"
MSG_SHARE_INFO="\nPlease, send the connection link and the password to your colleague"
MSG_CLOSE="The desktop sharing session is started. Close this window to terminate"
MSG_CONNECTED="someone connected from"
# -----------------------------------------------------------------------------
# ENVIRONMENT
# -----------------------------------------------------------------------------
PGID=$$
RUNDIR="/var/run/user/$UID"
PIDFILE="$RUNDIR/vnc.$PGID"
HOST=$(hostname -I | awk '{print $1}')
PORT=6080
SHARE_LINK="http://$NOVNC_SERVER/novnc/?host=$HOST&port=$PORT"
echo $PGID > $PIDFILE
# -----------------------------------------------------------------------------
# cleanup
# -----------------------------------------------------------------------------
function cleanup {
set +e
pkill -U $UID -f " YAD-$PGID"
pkill -U $UID -f " VNC-$PGID"
sleep 0.2 && pkill -U $UID -9 -f " VNC-$PGID"
pkill -U $UID -f "websockify .*$PORT"
rm -f $PIDFILE
pkill -U $UID -g $PGID
}
# trap func
trap cleanup EXIT
# -----------------------------------------------------------------------------
# terminate_active_instances: terminate the active instances except this one
# -----------------------------------------------------------------------------
function terminate_active_instances {
ls $RUNDIR/vnc.* | grep -v "vnc.$PGID" | \
while read -r pidfile
do
pgid=$(echo $pidfile | cut -d '.' -f2)
pkill -U $UID -f " YAD-$pgid" || true
pkill -U $UID -f " VNC-$pgid" || true
sleep 0.2 && pkill -U $UID -9 -f " VNC-$pgid" || true
pkill -U $UID -f "websockify .*$PORT" || true
pkill -U $UID -g $pgid || true
rm -f $pidfile
done
}
# -----------------------------------------------------------------------------
# renew-credential: regenerate the x11vnc password
# -----------------------------------------------------------------------------
function renew-credential {
mkdir -p ~/.vnc
PASSWD=$(shuf -i 100000-999999 -n 1)
x11vnc -storepasswd $PASSWD ~/.vnc/passwd
(yad --title="$TITLE" --splash --no-escape --borders=20 \
--text-align=center --selectable-labels \
--buttons-layout=edge --button=gtk-cancel:0 \
--form --align=center \
--field="<big>$SHARE_LINK</big>:LBL" --field=" :LBL" \
--field="<b><big><big>$PASSWD</big></big></b>:LBL" \
--field=" :LBL" --field=":LBL" --field="$MSG_SHARE_INFO:LBL" \
-- YAD-$PGID && kill $PGID) &
}
# -----------------------------------------------------------------------------
# start-websockify
# -----------------------------------------------------------------------------
function start-websockify {
while read -r output
do
if [[ -n "$(echo $output | egrep 'connecting to')" ]]; then
ip=$(echo $output | cut -d ' ' -f1)
yad --title="" --escape-ok --fixed --borders=20 \
--text-align=center --timeout=5 --no-buttons \
--text="$MSG_CONNECTED" \
--form --align=center --field=" :LBL" \
--field="<b><big><big>$ip</big></big></b>:LBL" \
-- YAD-$PGID &
fi
done < <(websockify --heartbeat=30 $PORT 127.0.0.1:$VNCPORT 2>&1)
}
# -----------------------------------------------------------------------------
# share-desktop: start and manage the x11vnc and websockify instances
# -----------------------------------------------------------------------------
function share-desktop {
oldport=0
splashed=false
while read -r output
do
if [[ -n "$(echo $output | egrep '^PORT=')" ]]; then
VNCPORT=$(echo $output | cut -d '=' -f2)
# restart websockify if the port is changed
if [[ "$oldport" != "$VNCPORT" ]]; then
pkill -U $UID -f "websockify .*$PORT" || true
start-websockify &
oldport=$VNCPORT
fi
# open the permanent splash window if it's not opened before
elif [[ -n "$(echo $output | egrep 'client_set_net:')" ]] && \
[[ "$splashed" = false ]]; then
pkill -U $UID -f " YAD-$PGID" || true
(yad --title="$TITLE" --splash --no-escape --borders=20 \
--buttons-layout=edge --button=gtk-close:0 \
--text="$MSG_CLOSE" \
-- YAD-$PGID && kill $PGID) &
splashed=true
fi
done < <(x11vnc -display :0 -localhost -autoport 5900 -noipv6 -nolookup \
-once -loop -usepw -shared -noxdamage -nodpms \
-tag VNC-$PGID 2>&1)
}
# -----------------------------------------------------------------------------
# RUN
# -----------------------------------------------------------------------------
# check the running instances. don't go on if the user don't accept to
# terminate the old instances.
[[ -n "$(ls $RUNDIR/vnc.* | grep -v vnc.$PGID)" ]] && \
yad --title="$TITLE" --splash --no-escape --borders=20 \
--buttons-layout=edge --button=gtk-yes:0 --button=gtk-no:1 \
--text="$MSG_CLOSE_OLD" \
-- YAD-$PGID
# terminate the running instances
terminate_active_instances
# confirmation to start a new instance
yad --title="$TITLE" --splash --no-escape --borders=20 \
--buttons-layout=edge --button=gtk-yes:0 --button=gtk-no:1 \
--text="$MSG_SHARE" \
-- YAD-$PGID
# renew and share the credential
renew-credential
# start to share the desktop
share-desktop