Re: How to use gksu to safely run a non-open-source application?

[Zoran Rilak <bruce tesla rcub bg ac yu>]

On Mon, 2004-12-27 at 10:29 -0500, Jack Dodds wrote:

> However, RealPlayer doesn't like being run by sudo.  If I enter in a 
> terminal:
>    sudo -u realplay /home/realplay/RealPlayer/realplay
> I get:
>    Xlib: connection to ":0.0" refused by server
>    Xlib: No protocol specified
>    ** ERROR **: Unable to open display

    The error report, as usual, tells you where the problem is. O:-)  RealPlayer probably doesn't have anything against itself running suid - and any program having something to say on that topic is likely to spurt out a meaningful message.  Anyhow, what you're getting is a message from X telling you that it has denied an unprivileged user of access to your display.  When you run your X, it defaults to allowing access to you and only to you (i.e. only to processes which you own), so root cannot start XLib apps on that display.

    There's a simple command "xhost" which is used to manimulate the access list.  Typically 'xhost +root' or even 'xhost +' (strongly discouraged, esp. if networked!) will do your job.

    By the way, this accounts for all the other  XLib: connection to ":0.0" refused by server  messages.


Best
Zoran

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