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 # 15 cmd="x11vnc -nap -q -bg -display" 16 viewer="vncviewer" 17 rsh=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 # 27 tunnel_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 # 35 tunnel_encodings="copyrect tight zrle hextile zlib corre rre" 36 37 if [ "$USER" = "runge" ]; then 38 cmd="x11vnc.expt -nap -q -bg -rfbauth .vnc/passwd -display" 39 viewer="vncviewerz" 40 fi 41 42 if [ "X$1" = "X-s" ]; then 43 shift 44 rsh=ssh 45 elif [ "X$1" = "X-S" ]; then 46 shift 47 rsh=ssh 48 tunnel=1 49 cmd=`echo "$cmd" | sed -e 's/ / -localhost /'` 50 fi 51 52 remote=$1 53 if echo "$remote" | grep ':' > /dev/null; then 54 : 55 else 56 remote="$remote:0" 57 fi 58 59 host=`echo "$remote" | awk -F: '{print $1}'` 60 disp=`echo "$remote" | awk -F: '{print $2}'` 61 disp=":$disp" 62 if [ "X$host" = "X" ]; then 63 echo "bad host." 64 exit 1 65 fi 66 67 # start the remote x11vnc: 68 if [ $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 $tmp 113 else 114 port=`$rsh $host "$cmd $disp" | grep '^PORT=' | sed -e 's/PORT=//'` 115 fi 116 117 echo "x11vnc port is '$port'" 118 119 # now start up the viewer on this end: 120 if 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 130 else 131 echo "bad port." 132 exit 1 133 fi 134
