Re: Subfiles in batch job -- RPG400-L

As far as your question goes, I can't think of any obvious security holes, 
unless your program allows the user to get access to a command line via 
QCMD.  Once there, they would be entering commands according to the user ID 
of the job that has the tube allocated.  Also, I can't recall if the system 
request or attention keys function...

This feature is a throwback to the old days, certainly S/36, perhaps 
earlier.  I experimented with it last in about '85, but never really had 
any kind of need for a 'ticker' app or information kiosk.

Oh, if your program doesn't have the screen allocated, it will likely have 
a signon display.  I suppose it depends on your shop standards whether or 
not signon displays would be allowed in an insecure, public area.  You 
could certainly write a special routine to keep the device varied off until 
you wish to use it.  Perhaps there are even some tubes that might function 
without a keyboard in the case where you are simply displaying information 
with no need for user input.

Regards,
Rich

At 04:53 PM 12/18/00 -0800, you wrote:


>Um.. uhh.. wow.  This is intriguing.  Tell me this then...
>
>Wouldn't it be possible to take a dumb tube and stick it out in an area
>and not sign it on.  Then have an RPG program that had the job do an
>Override to this display file write to the screen without waiting for
>a response.  All this going on in a never ending batch job.  So now I
>have a green screen slide show going on to a device that is not really
>secure, but it's not signed onto the system anyway, so no body can get
>access that way?
>
>Or even better yet, have it wait for a response now and then.  Or allow for
>input into the display file.  Then the program could change what it shows
>or whatever depending on what the person enters.  There is absolutely no way
>the person can get into the system since it's not signed on.  There is no
>interactive session waiting to get a command line too.
>
>Or am I missing something?
>
>Regards,
>
>Jim Langston
>
>Peter Connell wrote:
> >
> > Dan,
> > It just has to be sitting there with the signon display up so that it's not
> > allocated. The issue here is that it must always be available for the batch
> > job. However, the batch pgm still waits for a response when you do an EXFMT
> > so you have to go to the device to press ENTER when the display format
> > magically appears on the device without anyone having signed on.
> >
> > Cheers, Peter
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Regards,
Rich

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