runge
18 years ago
parent
123cab092c
commit
0a6f75c622
@ -0,0 +1,638 @@
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#!/bin/sh
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#
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# ssl_vncviewer: wrapper for vncviewer to use an stunnel SSL tunnel
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# or an SSH tunnel.
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#
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# Copyright (c) 2006 by Karl J. Runge <runge@karlrunge.com>
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#
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# You must have stunnel(8) installed on the system and in your PATH
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# (however, see the -ssh option below, in which case you will need ssh(1)
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# installed) Note: stunnel is usually installed in an "sbin" subdirectory.
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#
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# You should have "x11vnc -ssl ..." or "x11vnc -stunnel ..."
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# already running as the VNC server on the remote machine.
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# (or use stunnel on the server side for any other VNC server)
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#
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#
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# Usage: ssl_vncviewer [cert-args] host:display <vncviewer-args>
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#
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# e.g.: ssl_vncviewer snoopy:0
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# ssl_vncviewer snoopy:0 -encodings "copyrect tight zrle hextile"
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#
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# [cert-args] can be:
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#
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# -verify /path/to/cacert.pem
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# -mycert /path/to/mycert.pem
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# -proxy host:port
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#
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# -verify specifies a CA cert PEM file (or a self-signed one) for
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# authenticating the VNC server.
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#
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# -mycert specifies this client's cert+key PEM file for the VNC server to
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# authenticate this client.
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#
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# -proxy try host:port as a Web proxy to use the CONNECT method
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# to reach the VNC server (e.g. your firewall requires a proxy).
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#
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# For the "double proxy" case use -proxy host1:port1,host2:port2
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# (the first CONNECT is done through host1:port1 to host2:port2
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# and then a 2nd CONNECT to the destination VNC server.)
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#
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# See http://www.karlrunge.com/x11vnc/#faq-ssl-ca for details on SSL
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# certificates with VNC.
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#
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# A few other args (not related to SSL and certs):
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#
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# -ssh Use ssh instead of stunnel SSL. ssh(1) must be installed and you
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# must be able to log into the remote machine via ssh.
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#
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# In this case "host:display" may be of the form "user@host:display"
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# where "user@host" is used for the ssh login (see ssh(1) manpage).
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#
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# If -proxy is supplied it can be of the forms: "gwhost" "gwhost:port"
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# "user@gwhost" or "user@gwhost:port". "gwhost" is an incoming ssh
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# gateway machine (the VNC server is not running there), an ssh -L
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# redir is used to "host" in "host:display" from "gwhost". Any "user@"
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# part must be in the -proxy string (not in "host:display").
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#
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# Under -proxy use "gwhost:port" if connecting to any ssh port
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# other than the default (22). (even for the non-gateway case,
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# -proxy must be used to specify a non-standard ssh port)
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#
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# A "double ssh" can be specified via a -proxy string with the two
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# hosts separated by a comma:
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#
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# [user1@]host1[:port1],[user2@]host2[:port2]
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#
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# in which case a ssh to host1 and thru it via a -L redir a 2nd
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# ssh is established to host2.
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#
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# Examples:
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#
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# ssl_vncviewer -ssh bob@bobs-home.net:0
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# ssl_vncviewer -ssh -sshcmd 'x11vnc -localhost' bob@bobs-home.net:0
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#
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# ssl_vncviewer -ssh -proxy fred@mygate.com:2022 mymachine:0
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# ssl_vncviewer -ssh -proxy bob@bobs-home.net:2222 localhost:0
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#
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# ssl_vncviewer -ssh -proxy fred@gw-host,fred@peecee localhost:0
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#
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# -sshcmd cmd Run "cmd" via ssh instead of the default "sleep 15"
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# e.g. -sshcmd 'x11vnc -display :0 -localhost -rfbport 5900'
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#
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# -sshargs "args" pass "args" to the ssh process, e.g. -L/-R port redirs.
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#
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# -sshssl Tunnel the SSL connection thru a SSH connection. The tunnel as
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# under -ssh is set up and the SSL connection goes thru it. Use
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# this if you want to have and end-to-end SSL connection but must
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# go thru a SSH gateway host (e.g. not the vnc server). Or use
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# this if you need to tunnel additional services via -R and -L
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# (see -sshargs above).
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#
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# ssl_vncviewer -sshssl -proxy fred@mygate.com mymachine:0
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#
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#
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# -alpha turn on cursor alphablending hack if you are using the
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# enhanced tightvnc vncviewer.
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#
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# -grab turn on XGrabServer hack if you are using the enhanced tightvnc
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# vncviewer (e.g. for fullscreen mode in some windowmanagers like
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# fvwm that do not otherwise work in fullscreen mode)
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#
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#
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# set VNCVIEWERCMD to whatever vncviewer command you want to use.
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#
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VNCIPCMD=${VNCVIEWERCMD:-vncip}
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VNCVIEWERCMD=${VNCVIEWERCMD:-vncviewer}
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#
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# Same for STUNNEL, e.g. set it to /path/to/stunnel or stunnel4, etc.
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#
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PATH=$PATH:/usr/sbin:/usr/local/sbin:/dist/sbin; export PATH
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if [ "X$STUNNEL" = "X" ]; then
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type stunnel4 > /dev/null 2>&1
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if [ $? = 0 ]; then
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STUNNEL=stunnel4
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else
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STUNNEL=stunnel
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fi
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fi
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help() {
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tail +2 "$0" | sed -e '/^$/ q'
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}
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gotalpha=""
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use_ssh=""
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use_sshssl=""
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direct_connect=""
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ssh_sleep=15
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ssh_cmd="sleep $ssh_sleep"
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if [ "X$SSL_VNCVIEWER_SSH_CMD" != "X" ]; then
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ssh_cmd="$SSL_VNCVIEWER_SSH_CMD"
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fi
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ssh_args=""
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# grab our cmdline options:
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while [ "X$1" != "X" ]
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do
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case $1 in
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"-verify") shift; verify="$1"
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;;
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"-mycert") shift; mycert="$1"
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;;
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"-proxy") shift; proxy="$1"
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;;
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"-ssh") use_ssh=1
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;;
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"-sshssl") use_ssh=1
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use_sshssl=1
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;;
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"-sshcmd") shift; ssh_cmd="$1"
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;;
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"-sshargs") shift; ssh_args="$1"
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;;
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"-alpha") gotalpha=1
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;;
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"-grab") VNCVIEWER_GRAB_SERVER=1; export VNCVIEWER_GRAB_SERVER
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;;
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"-h"*) help; exit 0
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;;
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"--h"*) help; exit 0
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;;
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*) break
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;;
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esac
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shift
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done
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if [ "X$gotalpha" != "X1" ]; then
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NO_ALPHABLEND=1
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export NO_ALPHABLEND
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fi
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orig="$1"
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shift
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if [ "X$use_ssh" = "X1" -a "X$use_sshssl" = "X" ]; then
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if [ "X$mycert" != "X" -o "X$verify" != "X" ]; then
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echo "-mycert and -verify cannot be used in -ssh mode"
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exit 1
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fi
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fi
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if echo "$orig" | grep '^vnc://' > /dev/null; then
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orig=`echo "$orig" | sed -e 's,vnc://,,'`
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verify=""
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mycert=""
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use_ssh=""
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use_sshssl=""
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direct_connect=1
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fi
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# play around with host:display port:
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if echo "$orig" | grep ':' > /dev/null; then
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:
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else
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orig="$orig:0"
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fi
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host=`echo "$orig" | awk -F: '{print $1}'`
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disp=`echo "$orig" | awk -F: '{print $2}'`
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if [ "X$host" = "X" ]; then
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host=localhost
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fi
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if [ $disp -lt 200 ]; then
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port=`expr $disp + 5900`
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else
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port=$disp
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fi
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# try to find an open listening port via netstat(1):
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inuse=""
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if uname | grep Linux > /dev/null; then
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inuse=`netstat -ant | egrep 'LISTEN|WAIT|ESTABLISH|CLOSE' | awk '{print $4}' | sed 's/^.*://'`
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elif uname | grep SunOS > /dev/null; then
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inuse=`netstat -an -f inet -P tcp | grep LISTEN | awk '{print $1}' | sed 's/^.*\.//'`
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# add others...
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fi
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date_sec=`date +%S`
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findfree() {
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try0=$1
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try=$try0
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use0=""
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while [ $try -lt 6000 ]
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do
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if [ "X$inuse" = "X" ]; then
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break
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fi
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if echo "$inuse" | grep -w $try > /dev/null; then
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:
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else
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use0=$try
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break
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fi
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try=`expr $try + 1`
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done
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if [ "X$use0" = "X" ]; then
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use0=`expr $date_sec + $try0`
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fi
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echo $use0
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}
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use=`findfree 5930`
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if [ $use -ge 5900 ]; then
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N=`expr $use - 5900`
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else
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N=$use
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fi
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if echo "$0" | grep vncip > /dev/null; then
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VNCVIEWERCMD="$VNCIPCMD"
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fi
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if [ "X$use_ssh" = "X1" ]; then
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ssh_port="22"
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ssh_host="$host"
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vnc_host="localhost"
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ssh=${SSH:-"ssh -x"}
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if echo "$proxy" | grep "," > /dev/null; then
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proxy1=`echo "$proxy" | awk -F, '{print $1}'`
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proxy2=`echo "$proxy" | awk -F, '{print $2}'`
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# user1@gw1.com:port1,user2@ws2:port2
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ssh_host1=`echo "$proxy1" | awk -F: '{print $1}'`
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ssh_port1=`echo "$proxy1" | awk -F: '{print $2}'`
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if [ "X$ssh_port1" = "X" ]; then
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ssh_port1="22"
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fi
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ssh_host2=`echo "$proxy2" | awk -F: '{print $1}'`
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ssh_user2=`echo "$ssh_host2" | awk -F@ '{print $1}'`
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ssh_host2=`echo "$ssh_host2" | awk -F@ '{print $2}'`
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if [ "X$ssh_host2" = "X" ]; then
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ssh_host2=$ssh_user2
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ssh_user2=""
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else
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ssh_user2="${ssh_user2}@"
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fi
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ssh_port2=`echo "$proxy2" | awk -F: '{print $2}'`
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if [ "X$ssh_port2" = "X" ]; then
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ssh_port2="22"
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fi
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proxport=`findfree 3500`
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echo
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echo "Running 1st ssh proxy:"
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echo "$ssh -f -x -p $ssh_port1 -t -e none -L $proxport:$ssh_host2:$ssh_port2 $ssh_host1 \"sleep 30\""
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$ssh -f -x -p $ssh_port1 -t -e none -L $proxport:$ssh_host2:$ssh_port2 $ssh_host1 "sleep 30"
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ssh_args="$ssh_args -o NoHostAuthenticationForLocalhost=yes"
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sleep 1
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stty sane
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proxy="${ssh_user2}localhost:$proxport"
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fi
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if [ "X$proxy" != "X" ]; then
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ssh_port=`echo "$proxy" | awk -F: '{print $2}'`
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if [ "X$ssh_port" = "X" ]; then
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ssh_port="22"
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fi
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ssh_host=`echo "$proxy" | awk -F: '{print $1}'`
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vnc_host="$host"
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fi
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echo ""
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echo "Running ssh:"
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sz=`echo "$ssh_cmd" | wc -c`
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if [ "$sz" -gt 200 ]; then
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info="..."
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else
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info="$ssh_cmd"
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fi
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C=""
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if [ "X$SSL_VNCVIEWER_USE_C" != "X" ]; then
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C="-C"
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fi
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# the -t option actually speeds up typing response via VNC!!
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if [ "X$SSL_VNCVIEWER_SSH_ONLY" != "X" ]; then
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echo "$ssh -x -p $ssh_port -t $C $ssh_args $ssh_host \"$info\""
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echo ""
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$ssh -x -p $ssh_port -t $C $ssh_args $ssh_host "$ssh_cmd"
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exit $?
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elif [ "X$SSL_VNCVIEWER_NO_F" != "X" ]; then
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echo "$ssh -x -p $ssh_port -t $C -L ${use}:${vnc_host}:${port} $ssh_args $ssh_host \"$info\""
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echo ""
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$ssh -x -p $ssh_port -t $C -L ${use}:${vnc_host}:${port} $ssh_args $ssh_host "$ssh_cmd"
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else
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echo "$ssh -x -f -p $ssh_port -t $C -L ${use}:${vnc_host}:${port} $ssh_args $ssh_host \"$info\""
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echo ""
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$ssh -x -f -p $ssh_port -t $C -L ${use}:${vnc_host}:${port} $ssh_args $ssh_host "$ssh_cmd"
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fi
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if [ "$?" != "0" ]; then
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echo ""
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echo "ssh to $ssh_host failed."
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exit 1
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fi
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echo ""
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if [ "X$ssh_cmd" = "Xsleep $ssh_sleep" ] ; then
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sleep 1
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else
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# let any command get started a bit.
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sleep 5
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fi
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echo ""
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#reset
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stty sane
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if [ "X$use_sshssl" = "X" ]; then
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echo "Running viewer:"
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echo "$VNCVIEWERCMD" "$@" localhost:$N
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echo ""
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"$VNCVIEWERCMD" "$@" localhost:$N
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exit $?
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else
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use2=`findfree 5960`
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host0=$host
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port0=$port
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host=localhost
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port=$use
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use=$use2
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N=`expr $use - 5900`
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proxy=""
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fi
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fi
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# create the stunnel config file:
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if [ "X$verify" != "X" ]; then
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if [ -d $verify ]; then
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verify="CApath = $verify"
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else
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verify="CAfile = $verify"
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fi
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verify="$verify
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verify = 2"
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fi
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if [ "X$mycert" != "X" ]; then
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cert="cert = $mycert"
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fi
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mytmp() {
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tf=$1
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rm -rf "$tf" || exit 1
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if [ -d "$tf" ]; then
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echo "tmp file $tf still exists as a directory."
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exit 1
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elif [ -L "$tf" ]; then
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echo "tmp file $tf still exists as a symlink."
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exit 1
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elif [ -f "$tf" ]; then
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echo "tmp file $tf still exists."
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exit 1
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fi
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touch "$tf" || exit 1
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chmod 600 "$tf" || exit 1
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}
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if echo "$RANDOM" | grep '[^0-9]' > /dev/null; then
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RANDOM=`date +%S`
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fi
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pcode() {
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tf=$1
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SSL_VNC_PROXY=$proxy; export SSL_VNC_PROXY
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SSL_VNC_DEST="$host:$port"; export SSL_VNC_DEST
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cod='#!/usr/bin/perl
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# A hack to glue stunnel to a Web proxy for client connections.
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use IO::Socket::INET;
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my ($first, $second) = split(/,/, $ENV{SSL_VNC_PROXY});
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my ($proxy_host, $proxy_port) = split(/:/, $first);
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my $connect = $ENV{SSL_VNC_DEST};
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print STDERR "\nperl script for web proxing:\n";
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print STDERR "proxy_host: $proxy_host\n";
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print STDERR "proxy_port: $proxy_port\n";
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print STDERR "proxy_connect: $connect\n";
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my $listen_handle = "";
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if ($ENV{SSL_VNC_LISTEN} != "") {
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my $listen_sock = IO::Socket::INET->new(
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Listen => 2,
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LocalAddr => "localhost",
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LocalPort => $ENV{SSL_VNC_LISTEN},
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Proto => "tcp");
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if (! $listen_sock) {
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die "perl proxy: $!\n";
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}
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my $ip;
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($listen_handle, $ip) = $listen_sock->accept();
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if (! $listen_handle) {
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die "perl proxy: $!\n";
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}
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}
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my $sock = IO::Socket::INET->new(
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PeerAddr => $proxy_host,
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PeerPort => $proxy_port,
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Proto => "tcp");
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if (! $sock) {
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unlink($0);
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die "perl proxy: $!\n";
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}
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my $con = "";
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if ($second ne "") {
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$con = "CONNECT $second HTTP/1.1\r\n";
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$con .= "Host: $second\r\n\r\n";
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} else {
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$con = "CONNECT $connect HTTP/1.1\r\n";
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$con .= "Host: $connect\r\n\r\n";
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}
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print STDERR "proxy_request1:\n$con";
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print $sock $con;
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unlink($0);
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my $rep = "";
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||||
while ($rep !~ /\r\n\r\n/) {
|
||||
my $c = getc($sock);
|
||||
print STDERR $c;
|
||||
$rep .= $c;
|
||||
}
|
||||
if ($rep !~ m,HTTP/.* 200,) {
|
||||
die "proxy error: $rep\n";
|
||||
}
|
||||
|
||||
if ($second ne "") {
|
||||
$con = "CONNECT $connect HTTP/1.1\r\n";
|
||||
$con .= "Host: $connect\r\n\r\n";
|
||||
print STDERR "proxy_request2:\n$con";
|
||||
|
||||
print $sock $con;
|
||||
|
||||
$rep = "";
|
||||
while ($rep !~ /\r\n\r\n/) {
|
||||
my $c = getc($sock);
|
||||
print STDERR $c;
|
||||
$rep .= $c;
|
||||
}
|
||||
if ($rep !~ m,HTTP/.* 200,) {
|
||||
die "proxy error: $rep\n";
|
||||
}
|
||||
}
|
||||
|
||||
if (fork) {
|
||||
print STDERR "parent\[$$] STDIN -> socket\n\n";
|
||||
if ($listen_handle) {
|
||||
xfer($listen_handle, $sock);
|
||||
} else {
|
||||
xfer(STDIN, $sock);
|
||||
}
|
||||
} else {
|
||||
print STDERR "child \[$$] socket -> STDOUT\n\n";
|
||||
if ($listen_handle) {
|
||||
xfer($sock, $listen_handle);
|
||||
} else {
|
||||
xfer($sock, STDOUT);
|
||||
}
|
||||
}
|
||||
exit;
|
||||
|
||||
sub xfer {
|
||||
my($in, $out) = @_;
|
||||
$RIN = $WIN = $EIN = "";
|
||||
$ROUT = "";
|
||||
vec($RIN, fileno($in), 1) = 1;
|
||||
vec($WIN, fileno($in), 1) = 1;
|
||||
$EIN = $RIN | $WIN;
|
||||
|
||||
while (1) {
|
||||
my $nf = 0;
|
||||
while (! $nf) {
|
||||
$nf = select($ROUT=$RIN, undef, undef, undef);
|
||||
}
|
||||
my $len = sysread($in, $buf, 8192);
|
||||
if (! defined($len)) {
|
||||
next if $! =~ /^Interrupted/;
|
||||
print STDERR "perl proxy\[$$]: $!\n";
|
||||
last;
|
||||
} elsif ($len == 0) {
|
||||
print STDERR "perl proxy\[$$]: Input is EOF.\n";
|
||||
last;
|
||||
}
|
||||
my $offset = 0;
|
||||
my $quit = 0;
|
||||
while ($len) {
|
||||
my $written = syswrite($out, $buf, $len, $offset);
|
||||
if (! defined $written) {
|
||||
print STDERR "perl proxy\[$$]: Output is EOF. $!\n";
|
||||
$quit = 1;
|
||||
last;
|
||||
}
|
||||
$len -= $written;
|
||||
$offset += $written;
|
||||
}
|
||||
last if $quit;
|
||||
}
|
||||
close($in);
|
||||
close($out);
|
||||
}
|
||||
'
|
||||
echo "$cod" > $tf
|
||||
chmod 700 $tf
|
||||
}
|
||||
|
||||
ptmp=""
|
||||
if [ "X$proxy" != "X" ]; then
|
||||
ptmp="/tmp/ssl_vncviewer${RANDOM}.$$.pl"
|
||||
mytmp "$ptmp"
|
||||
pcode "$ptmp"
|
||||
connect="exec = $ptmp"
|
||||
else
|
||||
connect="connect = $host:$port"
|
||||
fi
|
||||
|
||||
if [ "X$direct_connect" != "X" ]; then
|
||||
echo ""
|
||||
echo "Running viewer for direct connection:"
|
||||
echo ""
|
||||
echo "** NOTE: THERE WILL BE NO SSL OR SSH ENCRYPTION **"
|
||||
echo ""
|
||||
if type printf > /dev/null 2>&1; then
|
||||
printf "Are you sure you want to continue? [y]/n "
|
||||
else
|
||||
echo -n "Are you sure you want to continue? [y]/n "
|
||||
fi
|
||||
read x
|
||||
if [ "X$x" = "Xn" ]; then
|
||||
exit 1
|
||||
fi
|
||||
echo ""
|
||||
if [ "X$ptmp" != "X" ]; then
|
||||
SSL_VNC_LISTEN=$use
|
||||
export SSL_VNC_LISTEN
|
||||
$ptmp &
|
||||
sleep 2
|
||||
host="localhost"
|
||||
disp="$N"
|
||||
fi
|
||||
echo "$VNCVIEWERCMD" "$@" $host:$disp
|
||||
echo ""
|
||||
"$VNCVIEWERCMD" "$@" $host:$disp
|
||||
exit $?
|
||||
fi
|
||||
|
||||
##debug = 7
|
||||
tmp=/tmp/ssl_vncviewer${RANDOM}.$$
|
||||
mytmp "$tmp"
|
||||
|
||||
cat > "$tmp" <<END
|
||||
foreground = yes
|
||||
pid =
|
||||
client = yes
|
||||
debug = 6
|
||||
$STUNNEL_EXTRA_OPTS
|
||||
$verify
|
||||
$cert
|
||||
|
||||
[vnc_stunnel]
|
||||
accept = localhost:$use
|
||||
$connect
|
||||
END
|
||||
|
||||
echo ""
|
||||
echo "Using this stunnel configuration:"
|
||||
echo ""
|
||||
cat "$tmp" | uniq
|
||||
echo ""
|
||||
sleep 1
|
||||
|
||||
echo ""
|
||||
echo "Running: stunnel"
|
||||
echo "$STUNNEL $tmp"
|
||||
$STUNNEL "$tmp" < /dev/tty > /dev/tty &
|
||||
pid=$!
|
||||
echo ""
|
||||
|
||||
# pause here to let the user supply a possible passphrase for the
|
||||
# mycert key:
|
||||
if [ "X$mycert" != "X" ]; then
|
||||
sleep 4
|
||||
fi
|
||||
sleep 2
|
||||
rm -f "$tmp"
|
||||
|
||||
echo ""
|
||||
echo "Running viewer:"
|
||||
echo "$VNCVIEWERCMD" "$@" localhost:$N
|
||||
echo ""
|
||||
"$VNCVIEWERCMD" "$@" localhost:$N
|
||||
|
||||
kill $pid
|
||||
sleep 1
|
||||
Loading…
Reference in new issue