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#!/bin/sh
# x11vnc option '-noxrecord' added as workaround for crashing bug
# See https://github.com/LibVNC/x11vnc/issues/61
#
# The option is not be needed with latest x11vnc from source, but we don't rely
# on the remote side being up to date.
direct_connection()
{
port=$((5900 + local_display))
ssh -o ControlPath=none -n \
-L $port:localhost:$port \
${remote_port:+-p $remote_port} \
"$remote_host" \
"x11vnc -noxrecord -nopw -ncache -ncache_cr -localhost -display ${remote_display}" &
pid=$!
sleep 1 # surrender race
xvncviewer -encodings "copyrect tight zrle hextile" localhost:0
kill $pid
}
quietly()
{
"$@" # >/dev/null 2>&1
}
reverse_connection()
{
d=${DISPLAY%.*}
d=${d#:}
port=$((5500 + d))
xvncviewer -fullscreen -encodings "copyrect tight zrle hextile" -listen &
pid=$!
quietly ssh -o ControlPath=none \
-R $port:localhost:$port \
${remote_port:+-p $remote_port} \
"$remote_host" \
"x11vnc -noxrecord -q -nopw -localhost -display ${remote_display} -coe localhost:$port -rfbport 0"
kill $pid
}
share_display()
{
set -x
port=5500
fuser -vk $port/tcp
ssh -o ControlPath=none \
-o ExitOnForwardFailure=yes \
-f \
-L $port:localhost:$port \
${remote_port:+-p $remote_port} \
"$remote_host" \
"fuser -vk $port/tcp; DISPLAY=${remote_display} xvncviewer -fullscreen -encodings 'copyrect tight zrle hextile' -listen"
trap "fuser -vk $port/tcp" INT
sleep 1
x11vnc -noxrecord -q -nopw -localhost -display ${local_display} -coe localhost:$port -rfbport 0
}
if [ "$1" = -r ]
then
shift
cmd=share_display
else
cmd=reverse_connection
fi
remote_host=${1:-blackboard}
case "$remote_host" in
*:*) remote_port=${remote_host##*:}
remote_host=${remote_host%:*}
;;
*) remote_port=
;;
esac
remote_display=${2:-:0}
local_display=${3:-:0}
$cmd
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