semantics of output of content filter (was: Re: 2.99.56pre4 config help)

[Ambrose Li <acli@ada.dhs.org>]

Hi,

On Tue, 10 Jun 2003, Ambrose Li wrote:

> 1. My ZMailer 2.99.56pre4 is not checking for existence of users.
>    HELO pattern only has R (because ftve needs interactive router
>    subsystem and I disabled that), but ROUTEUSER_IN_ABNORMAL_UNIX
>    is empty.
>
> 2. My content filter is not working. It seems to hang, even if I
>    put STDOUT->flush() calls after printing #hungry.

thanks for everyone for the tips. I finally got my content-policy
filter working. It turns out that perl's print doesn't seem to
really honour $| or even STDOUT->flush(). When I gave up and
replaced the print with a syswrite, the script started working.

(I don't know whether the patch is needed either, I found out the
syswrite solution after I applied the patch.)

Now that the filter works, it seems that I have more questions :-)

1. The example script shows that the format of the filter's output
   should be CODE COMMENT. However, the comments seem to indicate
   that the format can be CODE ENHANCED-STATUS-CODE COMMENT ("%i
   %i.%i.%i comment"). From a not-very-thorough reading of the
   code, it does seem to try to do that. However, I see strange
   things in the smtpserver log such as

KEXaCBG0003#    policyprogram said: rc=46  '0 2.0.0 Ok (-20/2) (2 s elapsed: 1.63818 kB/s)'
KEXaCBG0003w    250 2.6.0 .0.0 Ok (-20/2) (2 s elapsed: 1.63818 kB/s); S133502AbTFKEXb

   That is, smtpserver seem to recognize that there is a enhanced
   status code, but only grab part of the code. What exactly is
   expected from the filter?

   Actually this is not even consistently seen, I also see things
   like

KEPlB6L0004#    policyprogram said: rc=46  '0 2.0.0 Ok (-33/3) (1 s elapsed: 5.2
7148 kB/s)'
KEPlB6L0004w    250 2.6.0 S133498AbTFKEPn Roger, got 5037 bytes in the last chun
k, stored 5398 bytes into spool

   which totally ignores the comment passed by the filter, and also

KED0BsS0006#    policyprogram said: rc=89  '4 4.0.0 Looks like spam (94), Subjec
t: Valium_Get Xanax_cleft (3 s elapsed: 2.27344 kB/s)'
KED0BsS0008w    250 2.6.0 4.0.0 Looks like spam (94), Subject: Valium_Get Xanax_
cleft (3 s elapsed: 2.27344 kB/s); S133493AbTFKED3

   which does not recognize (what I think should be) the enhanced
   status code, but preserves the comment in smtpserver's output
   to the sender.

2. Officially the filter can only order pass, freeze, or reject.
   Is there a way to order "temporary fail" (4xx)?

Best regards,
-- 
Ambrose LI Cheuk-Wing  <a.c.li@ieee.org>

http://ada.dhs.org/~acli/
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