Exec module questions, v4

Fri Jul 31 15:34:08 CEST 2020

Ah, great Alan, thanks for the update. I'll maybe have a look into running it a different way, maybe through python or similar for the time being, possibly that's what people more typically do with CoA logoff requests.

Happy to also try any libkqueue patches, if that can be compiled separately.

I've submitted a separate crash report about a loop on github, but I might be able to work around it too, not the right place to discuss here.

Kind regards

-----Original Message-----
From: Freeradius-Users <freeradius-users-bounces+andy.franks1=nhs.net at lists.freeradius.org> On Behalf Of Alan DeKok
Sent: 31 July 2020 14:15
To: FreeRadius users mailing list <freeradius-users at lists.freeradius.org>
Subject: Re: Exec module questions, v4

On Jul 31, 2020, at 9:00 AM, FRANKS, Andy (SHREWSBURY AND TELFORD HOSPITAL NHS TRUST) via Freeradius-Users <freeradius-users at lists.freeradius.org> wrote:
>  Does the exec module in v4 still support "non-xlat" use, i.e. where you stipulate a program, run it, maybe collect output pairs values?

  It should.

  The main issue is that we're using libkqueue for our event library.  And llibkqueue doesn't have good support for handling child processes.  We have patches for it, but they need to be integrated back into the main libkqueue distribution.

> Some observations
> -          The stdout output "pickup" didn't seem to be consistent, here I've used radtest to fire a test auth twice in a row without changing anything (let me know if you'd like to see the complete output)

  Yes.  There are race conditions using libkqueue.  So the result from the child is sometimes picked up, and sometimes not.  :(

  We're working on fixing it.

> -          Also, the module return code isn't the same as it used to be, i.e. where 0 was ok, 1 was reject, 2 fail, as per https://networkradius.com/doc/3.0.10/raddb/mods-available/exec.html

  Ah yes... I'll push a fix.

> We used to rely on the text output, even if the exit code was non zero, and that exit code value to do some more stuff after a CoA request.

  It should still get the text output when the exit code is >= 0

> I should try modifying my unlang to do some xlats instead, but thought I'd ask first - is it just me - do I not understand deliberate changes that have taken place?

  It should behave largely the same as v3.

  Alan DeKok.

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