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|
#!/bin/bash
set -e
set -o pipefail
# 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.
ssh()
{
command ssh "$@" 2>&1 | sed 's/^/REMOTE> /'
}
direct_connection()
{
port=$((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
if [ "$NOTIGER" ]
then
xtightvncviewer -encodings "copyrect tight zrle hextile" localhost:0
else
xtigervncviewer localhost:0
fi
kill $pid
}
atexit()
{
[ "$DEBUG" ] || exec 2>/dev/null || true
set +e
set -- "$X11VNC" "$SSH"
ps hu "$@"
kill "$@"
rm -rf "$OUR_TMP"
}
share_display()
{
if [ "$DEBUG" ]
then
set -x
fi
port=5500
OUR_TMP=$(mktemp -d) || exit
local_socket_file=$OUR_TMP/x11vnc.socket
ssh_control=$OUR_TMP/ssh.socket
x11vnc -noxrecord -q -nopw -ncache -ncache_cr -display "${local_display}" -unixsock "$local_socket_file" -rfbport 0 &
X11VNC=$!
trap atexit EXIT
rando=$(tr -dc A-Za-z0-9 < /dev/urandom | head -c15) && [ "$rando" ]
remote_socket_file=/tmp/xtigervncviewer.$rando.socket
ssh -n \
-o ControlPath=none \
-o ExitOnForwardFailure=yes \
-R "$remote_socket_file:$local_socket_file" \
${remote_port:+ -p "$remote_port" } \
"$remote_host" \
"${DEBUG:+ set -x; } trap 'rm -f $remote_socket_file' EXIT; DISPLAY=$remote_display xtigervncviewer $remote_socket_file" &
SSH=$!
wait -n
}
if [ "$1" = -r ]
then
shift
cmd=share_display
elif [ "$1" = -d ]
then
shift
cmd=direct_connection
else
cmd=direct_connection
fi
remote_host=${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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