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134 lines
3.1 KiB
134 lines
3.1 KiB
#!/bin/sh
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#
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# usage: rx11vnc [-s] <host>:<xdisplay>
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# rx11vnc [-s] <host> (assumes xdisplay is 0)
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#
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# -s means use ssh instead of rsh.
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# -S tries to tunnel the vnc traffic thru ssh. (experimental...)
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#
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#set -xv
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#
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# Place your x11vnc cmd + options here (must have -bg and -display
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# with -display as the last one)
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#
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cmd="x11vnc -nap -q -bg -display"
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viewer="vncviewer"
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rsh=rsh
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#
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# The following two settings are only used under -S (ssh tunnel)
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#
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# Unfortunately, we have to set up the ssh port redirection *before*
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# x11vnc has started and selected its listening port.
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# tunnel_ports is a list of ports we expect/hope to be free on both
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# the local and remote machines:
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#
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tunnel_ports="5900 5901 5902 5903"
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#
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# VNC has a poor default in that if the client appears to be emanating
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# from the local machine, then raw encoding is preferred. With ssh port
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# redirection we appear to be coming from the localhost, but we are not.
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# We pass this encoding list to the viewer to give lowest preference to
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# raw encoding:
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#
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tunnel_encodings="copyrect tight zrle hextile zlib corre rre"
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if [ "$USER" = "runge" ]; then
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cmd="x11vnc.expt -nap -q -bg -rfbauth .vnc/passwd -display"
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viewer="vncviewerz"
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fi
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if [ "X$1" = "X-s" ]; then
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shift
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rsh=ssh
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elif [ "X$1" = "X-S" ]; then
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shift
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rsh=ssh
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tunnel=1
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cmd=`echo "$cmd" | sed -e 's/ / -localhost /'`
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fi
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remote=$1
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if echo "$remote" | grep ':' > /dev/null; then
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:
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else
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remote="$remote:0"
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fi
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host=`echo "$remote" | awk -F: '{print $1}'`
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disp=`echo "$remote" | awk -F: '{print $2}'`
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disp=":$disp"
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if [ "X$host" = "X" ]; then
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echo "bad host."
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exit 1
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fi
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# start the remote x11vnc:
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if [ $tunnel ]; then
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# much more kludgy for tunnelling:
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tmp=/tmp/rx11vnc.$$
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redir=""
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used_ports=`netstat -an | egrep '(ESTABLISHED|LISTEN) *$' \
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| sed -e 's/^[ ]*//' -e 's/^tcp[ 0-9][ 0-9]*//' \
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-e 's/[ ].*$//' -e 's/^.*[^0-9]//' | sort -nu`
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for p in $tunnel_ports
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do
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ok=1
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for u in $used_ports
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do
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if [ "X$p" = "X$u" ]; then
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echo "port $u is in use. skipping it"
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ok=
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break
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fi
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done
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if [ $ok ]; then
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redir="$redir -L $p:localhost:$p"
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fi
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done
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#
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# Have ssh put the command in the bg, then we look for PORT=
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# in the tmp file. The sleep at the end is to give us enough
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# time to connect thru the port redir, otherwise ssh will exit
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# before we can connect.
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#
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time=15
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$rsh -f $redir $host "$cmd $disp; echo END; sleep $time" > $tmp
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i=0
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while [ $i -lt $time ]
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do
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sleep 1
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if grep '^PORT=' $tmp > /dev/null; then
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port=`grep '^PORT=' $tmp | sed -e 's/PORT=//'`
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if [ "X$port" != "X" ]; then
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break
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fi
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fi
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i=`expr $i + 1`
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done
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cat $tmp
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rm -f $tmp
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else
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port=`$rsh $host "$cmd $disp" | grep '^PORT=' | sed -e 's/PORT=//'`
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fi
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echo "x11vnc port is '$port'"
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# now start up the viewer on this end:
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if echo "$port" | grep '^[0-9][0-9]*$' > /dev/null; then
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if [ $port -lt 6000 -a $port -ge 5900 ]; then
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# vncviewer special cases 0-99
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port=`expr $port - 5900`
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fi
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if [ $tunnel ]; then
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$viewer -encodings "$tunnel_encodings" "localhost:$port"
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else
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$viewer "$host:$port"
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fi
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else
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echo "bad port."
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exit 1
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fi
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