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# pm-jaube-prg-spamassassin -- Interface to spamassassin program
#
# File id
#
# Copyright (C) 1997-2010 Jari Aalto
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License as
# published by the Free Software Foundation; either version 2 of the
# License, or (at your option) any later version
#
# This program is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# General Public License for more details at
# <http://www.gnu.org/copyleft/gpl.html>.
#
# Warning
#
# Put all your Unsolicited Bulk Emacil (aka spam) filters towards the
# end of your `~/.procmailrc'. The idea is that valid messages are filed
# first (mailing lists, your work and private mail, bounces) and only
# the uncategorized messages are checked last.
#
# YOU CANNOT USE THIS PROCMAIL SUBROUTINE UNLESS YOU HAVE TRAINED THE
# BAYESIAN PROGRAM FIRST!
#
# To train:
#
# $ rm -f ~/.spamassassin/bayes*
# $ sa-learn $opt --local --no-rebuild --ham good.msg ...
# $ sa-learn $opt --local --no-rebuild --spam spam.msg ...
# $ sa-learn --rebuild
#
# Overview of features
#
# o Implements interface to http://www.spamassassin.org/
# project.
# o variable `ERROR' is set if message was spam.
# o Results are available in default headers (X-Spam-*)
#
# Description
#
# There are several Bayesian based statistical analysis programs that
# study the message's tokens and then classify it into two categories:
# good or bad, or if you like, ham and spam. All the Bayesian programs
# are not the same, so if you want to achive magic 99.99% probability
# the only methodology to do that is to chain several programs in
# serially. There is no single program that can solve the UBE detection.
# This procmail subroutine implements call interface to program
# `spamassassin', which must already have been installed.
#
# About bouncing message back
#
# The general consensus is, that you should not send bounces. The UBE
# sender is not there, because the address forged. Do not increase
# the network traffic; you will not do any good to anybody by
# bouncing messgas -- you just increase mail traffic even more.
# Instead save the messages to folders and periodically periodically
# check their contents.
#
# Required settings
#
# If `spamassassin' program is available, define this variable in your
# `~/.procmailrc'. Use absolute path to make the external shell
# quick; it'll save server load considerably.
#
# JA_UBE_SPAMASSASSIN_PRG = /usr/bin/spamassassin
#
# If you _do_ _not_ have program installed, do not leave the
# variable lying aroung, because it will keep this subroutine active.
# Calling a non existing program is not a good idea, so it better to
# empty the variable if the program is not available.
#
# Required settings
#
# None. No dependencies to other procmail modules.
#
# Call arguments (variables to set before calling)
#
# o JA_UBE_SPAMASSASSIN_PRG, path to the program
# o JA_UBE_SPAMASSASSIN_MIN_SIZE, minumum message size. Default is
# 100 bytes.
# o JA_UBE_SPAMASSASSIN_MAX_SIZE, maximum message size. Default is
# 256 000 bytes (about 256k).
# o JA_UBE_SPAMASSASSIN_FORCE, if set to _yes_ then call program no
# matter what. Normally if there already is `X-Spam-*' header,
# it is assumed that the message has already been checked
# and no new checking is needed.
#
# Return values
#
# o ERROR, is set to the return value of program if message was spam.
# o ERROR_INFO, is set if case is "unsure".
#
# Usage example
#
# PMSRC = $HOME/procmail # procmail recipe dir
#
# <other checks, mailing lists, work mail etc.>
#
# JA_UBE_SPAMASSASSIN_PRG = "/usr/bin/nice -n 5 /usr/bin/bogofilter"
# INCLUDERC = $PMSRC/pm-jaube-prg-spamassassin.rc
#
# # The ERROR will contains reason if program classified
# # the message into "bad" category.
#
# :0 :
# * ! ERROR ?? ^^^^
# junk.mbox
#
# File layout
#
# The layout of this file is managed by Emacs packages tinyprocmail.el
# and tinytab.el for the 4 tab text placement.
# See project http://freshmeat.net/projects/emacs-tiny-tools/
#
# Change Log
#
# None
dummy = "
========================================================================
pm-jaube-prg-spamassassin.rc: init:"
# ................................................... User variables ...
# You must define program path, because we don't know
# if it has been installed in this system or not
JA_UBE_SPAMASSASSIN_PRG = ${JA_UBE_SPAMASSASSIN_PRG:-""}
# No user options cannot be passed, because the output would
# change. This variable is not used.
# JA_UBE_SPAMASSASSIN_PRG_OPT = ${JA_UBE_SPAMASSASSIN_PRG_OPT:-""}
# Theshold values when to run spamassassin for a message.
JA_UBE_SPAMASSASSIN_MIN_SIZE = ${JA_UBE_SPAMASSASSIN_MIN_SIZE:-100}
JA_UBE_SPAMASSASSIN_MAX_SIZE = ${JA_UBE_SPAMASSASSIN_MAX_SIZE:-256000}
# Headers of earlier run of the program. No trailing colon.
JA_UBE_SPAMASSASSIN_HEADER_FLAG = ${JA_UBE_SPAMASSASSIN_HEADER_FLAG:-\
"X-Spam-Flag"}
JA_UBE_SPAMASSASSIN_HEADER_STATUS = ${JA_UBE_SPAMASSASSIN_HEADER_STATUS:-\
"X-Spam-Status"}
# Should we check even if there already was header
# JA_UBE_SPAMASSASSIN_HEADER ?
JA_UBE_SPAMASSASSIN_FORCE = ${JA_UBE_SPAMASSASSIN_FORCE:-"no"}
# ............................................................ do it ...
ERROR # Kill variables
ERROR_INFO
:0
* JA_UBE_SPAMASSASSIN_PRG ?? [a-z]
*$ ! 9876543210^0 ^$JA_UBE_SPAMASSASSIN_HEADER_FLAG
* 9876543210^0 JA_UBE_SPAMASSASSIN_FORCE ?? yes
{
# Last, run spamassassin if it has not already been run
# system wide at MTA level. NOTE: run spamassassin
# absolutely _last_ and only _if_ message was still not
# detected as Unsolicited Bulk Email by previous recipes.
#
# A lock is used so that only one program is run at a time.
# X-Spam-Flag just tests if systemwide SA has already
# been run => Headers are there already and we should save CPU
# and not call SA again. Skip too long messages (256K)
:0
*$ > $JA_UBE_SPAMASSASSIN_MIN_SIZE
*$ < $JA_UBE_SPAMASSASSIN_MAX_SIZE
{
jaubeSaved = $LINEBUF
LINEBUF = $JA_UBE_SPAMASSASSIN_MAX_SIZE
# This is Procmail's global variable. Kill it for now.
PROCMAIL_OVERFLOW
# The message must be saved, because if there is
# a problem with SA call, it will trash the whole message.
:0
* HB ?? ^^\/(.*$)+$
{
jaubeSavedMsg = $MATCH
}
# Procmail will set PROCMAIL_OVERFLOW if 'jaubeSavedMsg'
# cannot hold the content
#
# procmail: Exceeded LINEBUF
# procmail: Assigning "PROCMAIL_OVERFLOW=yes"
:0 fhbw : spamassassin$LOCKEXT
* PROCMAIL_OVERFLOW ?? ^^^^
| ${JA_UBE_SPAMASSASSIN_PRG} ${JA_UBE_SPAMASSASSIN_OPT:-""}
# Check if SA trashed the message. This is usually due
# to errors in environment.
#
# procmail: Executing "/usr/bin/spamassassin,"
# Use of uninitialized value in pattern match (m//) at /usr/share/perl5/Mail/SpamAssassin/ArchiveIterator.pm line 571.
# ...
# Unable to open : No such file or directory
:0
* HB ?? 1^1 ^.+
{ }
# If no lines were found, then message was trashed. Restore
:0 E fhbw
* jaubeSavedMsg ?? [a-z]
| echo -e "$jaubeSavedMsg"
LINEBUF = $jaubeSaved
}
:0
*$ ^$JA_UBE_SPAMASSASSIN_HEADER_FLAG: yes
*$ ^$JA_UBE_SPAMASSASSIN_HEADER_STATUS: \/.*
{
ERROR = "spamassassin; $MATCH"
}
}
dummy = "pm-jaube-prg-spamassassin.rc: end: $ERROR"
# End of file
|
