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#!/bin/bash
t="/tmp/remote-access-$DISPLAY"
mkdir -p "$t"
modmap="$t/modmap.want"
tmpmap="$t/modmap.have"
(
sleep 1
setxkbmap de
xmodmap -e "keycode 92 ="
xmodmap -e "keycode 187 ="
xmodmap -e "keycode 188 ="
xmodmap -e "keycode 26 = e E e E U20AC U20AC U20AC"
xmodmap -pke > "$modmap"
) &
. /opt/openslx/config
# TODO If we support multiple parallel sessions in the future, we need dedicated
# ports for each session for both, the VNC and the RPC port.
vnc_port="${SLX_REMOTE_VNC_PORT:-5900}"
if ! [ "$vnc_port" -gt 0 ] || ! [ "$vnc_port" -lt 65535 ]; then
vnc_port=5900
fi
srchost="$SLX_REMOTE_HOST_ACCESS"
if [ -n "$srchost" ]; then
# IPTABLES
rule="/opt/openslx/iptables/rules.d/80-remote-access"
if ! [ -e "$rule" ]; then
(
echo "#!/bin/sh"
echo "iptables -A INPUT -s "'"'"$srchost"'"'" -p tcp --dport $vnc_port -j ACCEPT"
echo "iptables -A INPUT -s "'"'"$srchost"'"'" -p tcp --dport 7551 -j ACCEPT"
echo "iptables -A INPUT -p tcp --dport $vnc_port -j DROP"
echo "iptables -A INPUT -p tcp --dport 7551 -j DROP"
) > "$rule"
chmod +x "$rule"
fi
fi
#set -x
#exec &> /tmp/fooooooooooooo
# dd since busybox head doesn't know -c
passwd="$( < /dev/urandom tr -c -d 'a-zA-Z0-9#&/=()[]{}' | dd bs=8 count=1 status=none )"
printf "%s" "$passwd" > "$t/vnc-passwd"
[ "$SLX_REMOTE_VNC" = "x11vnc" ] && chmod 0600 "$t/vnc-passwd"
(
# Make a copy of xauth, so if the xserver restarts, we'll use the old one and fail to connect
if [ -n "$XAUTHORITY" ]; then
copy="$( mktemp )"
cat "$XAUTHORITY" > "$copy"
export XAUTHORITY="$copy"
trap 'exit 1' INT TERM
trap 'rm -f -- "$copy"' EXIT
fi
< "$t/vnc-passwd" tigervncpasswd -f > "$t/tigervnc-passwd"
fails=0
while true; do
s="$( date +%s )"
x0vncserver -fg -SecurityTypes VncAuth,TLSvnc -rfbauth "$t/tigervnc-passwd" -rfbport "$vnc_port" -localhost no -Log "*:stdout:100" \
-AlwaysShared=true -DisconnectClients=false -MaxConnectionTime=0 -MaxDisconnectionTime=0 -MaxIdleTime=0
e="$( date +%s )"
d="$(( e - s ))"
if [ "$d" -gt 5 ]; then
fails=0
else
fails="$(( fails + 1 ))"
[ "$fails" -gt 10 ] && break
[ "$fails" -gt 3 ] && usleep 333333
fi
done
) &> "$t/x11vnc-log-$$" &
vncpid=$!
# Delay this a bit until x11vnc is ready, and since we might potentially have had a race
# with the ~poweron event, which would reset the password in the database.
(
if [ -n "$SLX_REMOTE_LOG" ]; then
url="${SLX_REMOTE_LOG//=clientlog/=remoteaccess}"
elif [ -n "$SLX_PVS_CONFIG_URL" ]; then
url="${SLX_PVS_CONFIG_URL//=roomplanner/=remoteaccess}"
else
url="http://${SLX_PXE_SERVER_IP}/slx-admin/api.php?do=remoteaccess"
fi
for _ in {1..20}; do
sleep 1
[ -e "/etc/cron.d/usage_stats" ] && break
done
[ -d "/proc/${vncpid}" ] || exit 1 # Something is wrong, bail
curl -s -S -L --retry 4 --retry-connrefused --max-time 3 --retry-max-time 10 \
--data-urlencode "password=$passwd" \
--data-urlencode "vncport=$vnc_port" \
"$url" > /dev/null
) &
gotone=false
vmvnc=false
idle=0
stepcount=0
# In case of stale entry
# TODO: This sucks anyways performance-wise for VMware, maybe remove?
iptables -t nat -D PREROUTING -p tcp --dport "$vnc_port" -j REDIRECT --to-ports 5901
while [ -d "/proc/${vncpid}" ]; do
sleep 5
if netstat -tn | awk 'BEGIN{ e=1 } { if ($4 ~ /:('"$vnc_port"'|5901)$/) e=0 } END{ exit e }'; then
gotone=true
idle=0
else
idle=$(( idle + 1 ))
fi
if $gotone; then
# As soon as someone is connected, "blank" the screen by setting brightness to zero.
# This doesn't seem to affect the framebuffer, luckily
# Let's see how well this works in practice. :-(
if (( stepcount == 0 )); then
declare -a args
args=()
for o in $( xrandr | grep -E '^[A-Z0-9-]+ connected.*[0-9]+x[0-9]+' | awk '{print $1}' ); do
args+=( "--output" "$o" "--brightness" "0" )
done
xrandr "${args[@]}"
fi
if (( stepcount++ > 3 )); then
stepcount=0
fi
fi
if $gotone && [ "$idle" -gt 120 ]; then # 120 * 5 = 10 mins
kill "$vncpid"
break
fi
# In case we access vmplayer via x11vnc; vmplayer won't leave the keymap alone >:(
xmodmap -pke > "$tmpmap"
if ! cmp -s "$tmpmap" "$modmap"; then
echo "$( date ) Reloading modmap" >> "$t/reload-log"
xmodmap "$modmap"
fi
# Check if we should redirect to vmware
if [ "$SLX_REMOTE_VNC" != 'x11vnc' ]; then
if netstat -tnl | awk 'BEGIN{ e=1 } { if ($4 ~ /:5901$/) e=0 } END{ exit e }'; then
#enable
if ! $vmvnc; then
killall x0vncserver
usleep 10000
iptables -t nat -I PREROUTING 1 -p tcp --dport "$vnc_port" -j REDIRECT --to-ports 5901
fi
vmvnc=true
else
# disable
if $vmvnc; then
iptables -t nat -D PREROUTING -p tcp --dport "$vnc_port" -j REDIRECT --to-ports 5901
fi
vmvnc=false
fi
fi
done
systemctl restart lightdm
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