antispam plugin, pipe backend, how to make it work?

[Tom Hendrikx]

On 12-04-16 20:14, Johannes Rohr wrote:
>     Hi, my setup is a dovecot 2.0.19 IMAP server on Ubuntu Precise with
> the antispam plugin in version  2.0+20120225-2 and spamassassin at
> version 3.2.2
> 
> I have been trying and failed to get the pipe backend of the antispam
> plugin to work. Spamassin by itself works, a manual call of sa-learn
> works fine. Bayes data is stored in a mysql DB.
> 
> I have the following configuration in /etc/dovecot/conf.d/90-plugin.conf
> 
> plugin {
>   #setting_name = value
>   sieve=~/.dovecot.sieve
>   sieve_dir=~/sieve
>     antispam_pipe_program_spam_arg = --spam
>     antispam_pipe_program_notspam_arg  = --ham
>     antispam_pipe_program = /usr/local/bin/sa-learn-pipe.sh
>     antispam_pipe_program_args = --username=%u # % expansion done by
> dovecot

You need to specify the argument list as a list seperated by semicolons,
per example on the wiki:

antispam_pipe_program_args = --username;%u

The verbose debug should give you some logging to work with. Also, what
does the wrapper script log when dovecot runs it? How does that differ
from a manual run?


>     antispam_trash = trash;Trash;Deleted Items;Deleted Messages
>     antispam_spam = SPAM;Junk
>     antispam_backend = pipe
>     antispam_verbose_debug = 1
>     antispam_debug_target = syslog
>     antispam_pipe_tmpdir = /tmp
> }
> 
> I have tried the following wrapper script:
> #!/bin/bash
> # set -x
> LOGFILE=/tmp/sa-learn-pipe.log
> echo "$$-start ($*)" >> $LOGFILE
> #echo $* > /tmp/sendmail-parms.txt
> cat<&0 >> /tmp/sendmail-msg-$$.txt
> /usr/bin/sa-learn $* -D /tmp/sendmail-msg-$$.txt >> $LOGFILE 2>&1 && \
> rm -f /tmp/sendmail-msg-$$.txt
> echo "$$-end" >> $LOGFILE
> exit 0
> 
> It somehow isn't working. I can call the wrapper script manually e.g.
> sudo -u vmail /usr/local/bin/sa-learn-pipe.sh --username=some at mail.user
> --ham \
> < someham
> 
> But it doesn't work from dovecot. It seems the script is called. but no
> new patterns show up in the bayes DB. Unfortunately, the plugin seems to
> be documented poorly. How does it call the programme it pipes to? Is it
> something like $programme --par1 --par2 < message ? Why can't /
> shouldn't I call sa-learn directly? All the instructions I found on the
> in internet contained a wrapper script, but none bothered to explain why
> you would actually need it.
> 
> I would be very grateful, if someone could enlighten me on that...
> 
> Cheers,
> 
> Johannes


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