On Fri, 1 Jan 2010, Karl J. Runge wrote:
On Fri, 1 Jan 2010, Warren Block <wbl...@wonkity.com> wrote:
Here are some examples that should work, I provide "prompt>" to indicate
which machine the command is run on (and I skip your -c preference):
supportee_host> ssh -t -N -f -L 5500:localhost:5500 $supporter_host && \
x11vnc -display :0 -connect_or_exit localhost:0 -rfbport 0
which should be the same as:
supportee_host> x11vnc -display :0 -proxy ssh://$supporter_host \
-connect_or_exit localhost:0 -rfbport 0
i.e. x11vnc has a built-in -proxy that already does what you want it
to do; it runs ssh(1) for you:
http://www.karlrunge.com/x11vnc/x11vnc_opts.html#opt-proxy
Note how I use -connect_or_exit instead of -connect to try to avoid
problems if the connection fails:
http://www.karlrunge.com/x11vnc/x11vnc_opts.html#opt-connect_or_exit
I also use the '-rfbport 0' described there to prevent x11vnc from listening
for any connections (which I think is what you want.)
Aside: Originally I thought you could ssh into supportee_host, for anyone
looking to do that here is the analogous command:
supporter_host> ssh -t -N -f -R 5500:localhost:5500 $supportee_host \
x11vnc -display :0 -connect_or_exit localhost:0 -rfbport 0
Yes. In fact, I first tried the x11vnc_ssh script and it worked great.
The only catch is that it needs ssh access into the supportee machine.
[SSL mode for x11vnc]
That looks more elegant. Are the security and speed comparable to ssh?
Speed shouldn't be a problem; I believe both ssh and 'x11vnc -ssl' use
OpenSSL for encrypting the session traffic. If a machine is *really*
slow the choice of encryption cipher may be noticable (I don't see a
big effect even on a 300MHz test machine I have.)
I've tried it now and it does just what is needed for my setup!
Finally, a little feedback:
On a Windows Vista system, AVG screamed that the netcat.exe from
ssvnc_windows_only-1.0.25.zip was a virus (don't think it is, just
mentioning it). The TightVNC server on that Vista machine will connect
with the FreeBSD ssvncviewer, and the ssvncviewer console window shows
status information, but no graphic window opens on the FreeBSD system.
The FreeBSD TightVNC vncviewer opens a window but has real trouble
keeping the display updated, no doubt due to Vista. Finally, the
UltraVNC server with special Vista video drivers works usably with
ssvncviewer. Can SSL be used with a Windows VNC server?
x11vnc talking to ssvnc-gui works noticeably better than all of those
combinations. Thanks for your work and your help!
-Warren Block * Rapid City, South Dakota USA
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