rx11vnc revision a430b2b5ca4f0967836f5820e8f03adc17fc0a24 
1#!/bin/sh
2#
3# usage: rx11vnc [-s] <host>:<xdisplay>
4#        rx11vnc [-s] <host>            (assumes xdisplay is 0)
5#
6# -s means use ssh instead of rsh.
7# -S tries to tunnel the vnc traffic thru ssh.  (experimental...)
8#
9#set -xv
10
11#
12# Place your x11vnc cmd + options here (must have -bg and -display
13# with -display as the last one)
14#
15cmd="x11vnc -nap -q -bg -display"
16viewer="vncviewer"
17rsh=rsh
18
19#
20# The following two settings are only used under -S (ssh tunnel)
21#
22# Unfortunately, we have to set up the ssh port redirection *before*
23# x11vnc has started and selected its listening port.
24# tunnel_ports is a list of ports we expect/hope to be free on both
25# the local and remote machines:
26#
27tunnel_ports="5900 5901 5902 5903"
28#
29# VNC has a poor default in that if the client appears to be emanating
30# from the local machine, then raw encoding is preferred.  With ssh port
31# redirection we appear to be coming from the localhost, but we are not.
32# We pass this encoding list to the viewer to give lowest preference to
33# raw encoding:
34#
35tunnel_encodings="copyrect tight zrle hextile zlib corre rre"
36
37if [ "$USER" = "runge" ]; then
38	cmd="x11vnc.expt -nap -q -bg -rfbauth .vnc/passwd -display"
39	viewer="vncviewerz"
40fi
41
42if [ "X$1" = "X-s" ]; then
43	shift
44	rsh=ssh
45elif [ "X$1" = "X-S" ]; then
46	shift
47	rsh=ssh
48	tunnel=1
49	cmd=`echo "$cmd" | sed -e 's/ / -localhost /'`
50fi
51
52remote=$1
53if echo "$remote" | grep ':' > /dev/null; then
54	:
55else
56	remote="$remote:0"
57fi
58
59host=`echo "$remote" | awk -F: '{print $1}'` 
60disp=`echo "$remote" | awk -F: '{print $2}'` 
61disp=":$disp"
62if [ "X$host" = "X" ]; then
63	echo "bad host."
64	exit 1
65fi
66
67# start the remote x11vnc:
68if [ $tunnel ]; then
69	# much more kludgy for tunnelling:
70	tmp=/tmp/rx11vnc.$$
71	redir=""
72	used_ports=`netstat -an | egrep '(ESTABLISHED|LISTEN) *$' \
73	    | sed -e 's/^[ 	]*//'   -e 's/^tcp[ 	0-9][ 	0-9]*//' \
74	          -e 's/[ 	].*$//' -e 's/^.*[^0-9]//' | sort -nu`
75	for p in $tunnel_ports
76	do
77		ok=1
78		for u in $used_ports
79		do
80			if [ "X$p" = "X$u" ]; then
81				echo "port $u is in use. skipping it"
82				ok=
83				break
84			fi
85		done
86		if [ $ok ]; then
87			redir="$redir -L $p:localhost:$p"
88		fi
89	done
90	#
91	# Have ssh put the command in the bg, then we look for PORT=
92	# in the tmp file.  The sleep at the end is to give us enough
93	# time to connect thru the port redir, otherwise ssh will exit
94	# before we can connect.
95	#
96	time=15
97	$rsh -t -f $redir $host "$cmd $disp; echo END; sleep $time" > $tmp
98
99	i=0
100	while [ $i -lt $time ]
101	do
102		sleep 1
103		if grep '^PORT=' $tmp > /dev/null; then
104			port=`grep '^PORT=' $tmp | sed -e 's/PORT=//'`
105			if [ "X$port" != "X" ]; then
106				break
107			fi
108		fi
109		i=`expr $i + 1`
110	done
111	cat $tmp
112	rm -f $tmp
113else
114	port=`$rsh $host "$cmd $disp" | grep '^PORT=' | sed -e 's/PORT=//'`
115fi
116
117echo "x11vnc port is '$port'"
118
119# now start up the viewer on this end:
120if echo "$port" | grep '^[0-9][0-9]*$' > /dev/null; then
121	if [ $port -lt 6000 -a $port -ge 5900 ]; then
122		# vncviewer special cases 0-99
123		port=`expr $port - 5900` 
124	fi
125	if [ $tunnel ]; then
126		$viewer -encodings "$tunnel_encodings" "localhost:$port"
127	else
128		$viewer "$host:$port"
129	fi
130else
131	echo "bad port."
132	exit 1
133fi
134