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Full Discussion: Pop up dialog box on remote computers
Top Forums Shell Programming and Scripting Pop up dialog box on remote computers Post 302144602 by Smiling Dragon on Thursday 8th of November 2007 09:59:11 PM
Old 11-08-2007
If you want to open an x-window on a remote machine uninvited, it's generally non-trivial.

If the users are not using Xauth security (eg MIT magic cookies etc) then it's not _too_ hard to determine the display to send to and fire a window at it.

This 'military software'; does it run with the display name (ie <hostname>:<display number>) in the commandline or do they rely on a $DISPLAY environment variable?
For that matter, does it even use X or is it run within a terminal session via X?

It's totally doable, but there are a lot of factors that will determine how to go about it.

High-level approach:
Produce a list of users to warn (probably from 'ps' or 'who' output)
Identify the X server they are connecting from
Obtain a copy of appropriate authorisation to send something to their X server
Send the message, taking care not to present them with an app that has elevated privilages.
Log the response to the message (if you need to).
 

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LEARN ABOUT DEBIAN

tk_dialog

tk_dialog(3tk)						       Tk Built-In Commands						    tk_dialog(3tk)

__________________________________________________________________________________________________________________________________________________

NAME

       tk_dialog - Create modal dialog and wait for response

SYNOPSIS

       tk_dialog window title text bitmap default string string ...
_________________________________________________________________

DESCRIPTION

       This procedure is part of the Tk script library.  Its arguments describe a dialog box:

       window Name of top-level window to use for dialog.  Any existing window by this name is destroyed.

       title  Text to appear in the window manager's title bar for the dialog.

       text   Message to appear in the top portion of the dialog box.

       bitmap If  non-empty,  specifies a bitmap to display in the top portion of the dialog, to the left of the text.	If this is an empty string
	      then no bitmap is displayed in the dialog.

       default
	      If this is an integer greater than or equal to zero, then it gives the index of the button that is to be the default button for  the
	      dialog (0 for the leftmost button, and so on).  If less than zero or an empty string then there will not be any default button.

       string There  will  be  one  button  for each of these arguments.  Each string specifies text to display in a button, in order from left to
	      right.

       After creating a dialog box, tk_dialog waits for the user to select one of the buttons either by clicking on the button with the  mouse	or
       by  typing  return  to invoke the default button (if any).  Then it returns the index of the selected button:  0 for the leftmost button, 1
       for the button next to it, and so on.  If the dialog's window is destroyed before the user selects one of the buttons, then -1 is returned.

       While waiting for the user to respond, tk_dialog sets a local grab.  This prevents the user from interacting with the  application  in  any
       way except to invoke the dialog box.

EXAMPLE

	      set reply [tk_dialog .foo "The Title" "Do you want to say yes?" 
		      questhead 0 Yes No "I'm not sure"]

SEE ALSO

       tk_messageBox(3tk)

KEYWORDS

       bitmap, dialog, modal

Tk									4.1							    tk_dialog(3tk)
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