From: Egoitz Aurrekoetxea Aurre (egoitzramattack.net)
Date: Sat Sep 12 2009 - 09:33:53 CDT

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El 12/09/2009, a las 15:38, Wietse Venema escribió:

> Egoitz Aurrekoetxea Aurre:
>>>> When you are running the policy service under the spawn daemon:
>>>>
>>>> 1) The time limit BEGINS after an SMTP server connects to the
>>>> policy server port, when a new policy daemon process is created.
>>>> Thus, an SMTP server always "mates" with a policy server that
>>>> has the full time limit left.
>
> After the SMTP server has "mated" with a new policy daemon process,
> the SMTP server keeps the connection open until it terminates.
> During this time, the SMTP server will handle one or more SMTP
> client requests, such as multiple requests in one SMTP session or
> requests from different SMTP client (one SMTP client connects,
> disconnects, another SMTP client connects, etc.)
>
> When the SMTP server disconnects from the policy daemon, the
> policy daemon must terminate.

and how could I know that the smtp server has disconnected from the
policy server? what does postfix send for knowing it? I mean like it's
tcpwrapped by spawn I don't know either some is connected or not....
it's just running waiting for attributes... For example, after I send
an email (so after connecting to an smtpd proccess and after sending
the mail and the quit command to postfix smtpd) if I do the following
ps I see :

$ ps aux | grep pl && ps aux | grep smtp
cyrus 68585 0.2 0.4 23784 7852 ?? Ss 4:20PM 0:00.08 /usr/
bin/perl /usr/local/etc/postfix/postfix-qreject-frontales.pl (perl5.8.8)
postfix 68584 0.0 0.1 13704 2232 ?? S 4:20PM 0:00.00
spawn -z -n 127.0.0.1:2222 -t inet user=cyrus argv=/usr/local/etc/
postfix/postfix-qreject-frontales.pl
postfix 68581 0.0 0.2 29456 4236 ?? S 4:20PM 0:00.01
smtpd -n smtp -t inet -u
postfix 68589 0.0 0.1 13828 2428 ?? S 4:20PM 0:00.01 smtp
-n smtp-amavis -t unix -u -o smtp_data_done_timeout=1200 -o
disable_dns_lookups=yes
postfix 68591 0.0 0.2 28432 3692 ?? S 4:20PM 0:00.01
[smtpd]

so I have a spawn proccess for each the policy daemon (frontales.pl)
and the own policy daemon running in this example with the user cyrus...

> It is an error to terminate before
> the SMTP server disconnects.

That's why policy daemon closes all mysql connections, all file
descriptors and all before printing action to STDOUT later clears
hash table of attributes and starts a new cycle
>
>
> In particular, the policy daemon should not terminate after each
> request. This would waste a lot of system resources.

That's why I do it this way, so it's done well then.
>
>
> If you believe that your SMTP server processes will be running fore
> more than 3600s (for example, when receiving large messages over
> a dialup connection) then increase the limit.
>
> Wietse

Thanks a lot really Wietse.

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