t_m_001@yahoo.com (Mori) writes:

> Dear all,
> I don't know if this is possible or not .....
> My colleague and I have the same user to log into a UNIX server.
> I have my PC and my colleague has his, both PCs have X-windows server.
> Is there a way to set DISPLAY parameter on the UNIX server to make it
> possible that me or my colleague can run X-windows applications on the
> UNIX server without having to change the DISPLAY variable on the UNIX
> server each time?
> Right now, if he wants to run a X-windows application on the UNIX
> server, he changes the value of DISPLAY to point to his machine:0.0,
> and if I want to do the same I change DISPLAY to point to my
> machine:0.0.
> I know that this is possible using SSH with tunneling and X11
> forwarding, but still curious to know if it's possible by manipulating
> the :0.0 part of the DISPLAY value?!

I was beginning to answer your question, but realized I can't without
knowing what software you are using. How are connecting to the UNIX
server?

--
- Mårten

mail: msv@kth.se *** ICQ: 4356928 *** mobile: +46 (0)707390385

In comp.windows.x, Mori

wrote
on 28 Feb 2004 17:43:31 -0800
:
> Dear all,
> I don't know if this is possible or not .....
> My colleague and I have the same user to log into a UNIX server.

Not sure how bright an idea that is, but that's beyond the
scope of this particular question. :-)

> I have my PC and my colleague has his, both PCs have X-windows server.
> Is there a way to set DISPLAY parameter on the UNIX server to make it
> possible that me or my colleague can run X-windows applications on the
> UNIX server without having to change the DISPLAY variable on the UNIX
> server each time?

You might want to look into XDMCP. Basically, that makes your
PC into an X terminal, and you can log into the server and
make it look as though you're logged in locally.

(The drawback: you'll be spewing packets around insecurely. For
small networks, that's only a small problem. For big networks... :-) )

Alternatively, ssh supports transparent tunnelling. If you have
things properly set up and /etc/ssh/sshd_config has X11Forwarding
set to 'yes', you can do

$ ssh -X remoteHost

and it will authenticate you (possibly by using a password or passphrase),
and then provide a transparent tunnel. (One can run a simple program
such as 'xeyes' to test this tunnel if need be.)

This option is more secure if the server is on a relatively open
LAN, or on the Internet.

> Right now, if he wants to run a X-windows application on the UNIX
> server, he changes the value of DISPLAY to point to his machine:0.0,
> and if I want to do the same I change DISPLAY to point to my
> machine:0.0.
> I know that this is possible using SSH with tunneling and X11
> forwarding, but still curious to know if it's possible by manipulating
> the :0.0 part of the DISPLAY value?!

If both you and your colleague are logged in and using SSH tunnelling,
and you happened to get there first, you'd automatically have your
DISPLAY environment variable set to localhost:10.0 (unless you've
changed the setting for X11DisplayOffset for some reason), and
your colleague will get localhost:11.0, for your respective remote
shells. Should you log into the machine again, you'd then get
localhost:12.0 for that particular shell.

Any packets forwarded to port 6010, 6011, or 6012 respectively are
proxied by sshd to your local ssh, and onward to your local X server.

> Thanks for any contribution!
> Regards,
> Mori


--
#191, ewill3@earthlink.net
It's still legal to go .sigless.

Hi Mårten/Ghost!
Thnx for the replies.

> Not sure how bright an idea that is, but that's beyond the
> scope of this particular question. :-)
Had to do it like this coz the UNIX sever is an Oracle Server and all
Oracle files/mounts are owned by "oracle" user. So to maintain Oracle,
one needs to log as oracle. And we both share this task.

Good tip regarding XDMCP, I'll have to look further into it, but this
gives me the beginning of the thread I was looking for to get
starting.

> I was beginning to answer your question, but realized I can't without
> knowing what software you are using. How are connecting to the UNIX
> server?
X-windows client & server: X-Win32 5.4
SSH client: Putty 0.53b

Cheers,
Mori

Mori wrote:
> Hi Mårten/Ghost!
> Thnx for the replies.
>
>
>>Not sure how bright an idea that is, but that's beyond the
>>scope of this particular question. :-)
>
> Had to do it like this coz the UNIX sever is an Oracle Server and all
> Oracle files/mounts are owned by "oracle" user. So to maintain Oracle,
> one needs to log as oracle. And we both share this task.

So you can have a two stage login. You login as yourself and establish
your session and then use an xterm to login as the oracle admin. You
could also use tools like sudo to enable your user to run oracle admin
commands without an explicit login.

-- ced

>
> Good tip regarding XDMCP, I'll have to look further into it, but this
> gives me the beginning of the thread I was looking for to get
> starting.
>
>
>>I was beginning to answer your question, but realized I can't without
>>knowing what software you are using. How are connecting to the UNIX
>>server?
>
> X-windows client & server: X-Win32 5.4
> SSH client: Putty 0.53b
>
> Cheers,
> Mori


--
Chuck Dillon
Senior Software Engineer
NimbleGen Systems Inc.

Mori wrote:

> X-windows client & server: X-Win32 5.4
> SSH client: Putty 0.53b

I'm not sure about Putty, but shouldn't it set up X11 forwarding (If your
server "supports" this) automatically.

Otherwise, you could try this:

set TTY=`tty|sed -e 's#/dev/##'`' '
setenv DISPLAY `who|grep $TTY|cut -f2 -d"("|sed -e 's/)//'`:0.0

-Frode

--
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