#!/bin/sh
#
# Uncomment the 'set -x' if you wish to have this script
#	display BASH debug information as it runs
#set -x

XAMIME_DIR=/usr/local/xamime
LOGFILE=$XAMIME_DIR/logs/spamfilter.log
MAILPACK=$1 
FAILOVER_SCRIPT=$XAMIME_DIR/spam-filter

# Spam Assassin binary - using the 'client/server' version.
if [ -f /usr/bin/spamc ]; then
	SA=/usr/bin/spamc
elif [ -f /usr/local/bin/spamc ]; then
	SA=/usr/local/bin/spamc
	else
	echo "Unable to locate spamc binary in either /usr/bin or /usr/local/bin" >> $LOGFILE
	exit 0
fi

# 2003-03-28 PLD: Spamc params are -x : exit with error 
#	if comms failure with spamd -t 30 : terminate if no connection in 10 seconds
SA_PARAMS="-x -t 30"

# Test the file size, if the email is > 250K, then don't bother
# scanning it.
FILESIZE=`ls -l $MAILPACK | awk '{print $5}'`
FILESIZE_LIMIT=250000

if [ $FILESIZE -gt $FILESIZE_LIMIT ]; then
	echo "$1: Mailpack greater than $FILESIZE_LIMIT bytes ( $FILESIZE : $MAILPACK )" >> $LOGFILE
	exit 0
fi


# Filter the mailpack through SpamAssassin - the output from
#	spamAssassin is the 'new' mailpack with the added headers.

$SA $SA_PARAMS < $MAILPACK > ${MAILPACK}.tmp
RETURN_CODE=$?


# If our spamc call failed, then we should failover to using the
#	non-daemonised version of SpamAssassin.  This will punch the
#	system load right up, but it will at least ensure that the email
#	is still being filtered.

if [ $RETURN_CODE -ne 0 ]; then
	echo "$MAILPACK: Spamc/d is not operational - invoking safety script $FAILOVER_SCRIPT" >> $LOGFILE
	$FAILOVER_SCRIPT $1
	$RETURN_CODE=$?
	exit $RETURN_CODE
fi



# Move the oroginal mailpack to $MAILPACK.org so that
#	we have a safety backup
#
# Then move the .tmp mailpack ( output from SA ) to our
#	original mailpack name

if [ -f ${MAILPACK}.tmp ]; then

	mv $MAILPACK $MAILPACK.org
	mv $MAILPACK.tmp $MAILPACK
	if [ -e $MAILPACK.org ]; then
	    rm -f $MAILPACK.org
	fi

fi


#echo "$RETURN_CODE:$1" >> $LOGFILE

exit $RETURN_CODE