#!/bin/sh
PATH="/bin:/usr/bin:/sbin:/usr/sbin"

UNPK=/usr/bin/uudeview
HEAD=/usr/bin/mimeheaders
SCAN=/usr/share/vscanx/vscanx
VERS=`$SCAN --version | grep "Virus data file"`
MAIL="virus@kdev.it"
SEND=/usr/sbin/sendmail

BASE=/var/spool/avirus
DIR=$BASE/$$.attachments
MSG=$BASE/$$.message
LOG=$BASE/$$.log
SED=`echo $BASE/$$. | sed 's/\//\\\\\//g'`

trap "rm -rf  $MSG $LOG.pkg $LOG.scn $LOG.rcp $DIR" 0 1 2 3 15

FROM="$1"
shift
RCPT="$@"
if [ -z "$RCPT" ] ; then
        echo "Filtering for unknown recipient"
        exit 69
fi

_virus () {
        echo "From: \"Antivirus Agent\" <$MAIL>"
        echo "To: $FROM $RCPT"
        echo "Cc: \"Antivirus Agent\" <$MAIL>"
        echo "Subject: Antivirus action notification"
        echo "X-Antivirus-Data: $VERS"
        echo ""
        echo "CONTROLLO ANTIVIRUS di KDEV (Kanta Development)."
        echo "Attenzione, un messaggio a voi destinato o da voi inviato e' risultato positivo "
        echo "al controllo antivirus del nostro mail server. Il messaggio contenente "
        echo "il virus E' STATO BLOCCATO. Contattate il MITTENTE indicato qui sotto."
        echo ""
        echo "This is the antivirus agent for KDEV (Kanta Development)."
        echo "We are sorry, but apparently a message was positively recognized"
        echo "as containing a virus and therefore has been deleted from the"
        echo "transmit queue. Please contact the E-Mail sender reported below!"
        echo "The antivirus scanner reported:"
        echo ""
	echo "MITTENTE - MESSAGE FROM:"
	echo "> $FROM"
        echo ""
	echo "DESTINATARIO - MESSAGE RECIPIENT(s):"
	for NAME in $RCPT ; do echo "> $NAME" ; done
        echo ""
	echo ""
        echo ""
        echo ""
        echo "Antivirus log:"
	echo "> $VERS"
	cat $LOG.scn | sed 's/^/> /g' | sed "s/$SED//g"
        echo "> Error condition $1"
        echo ""
        echo "Message headers:"
        cat $MSG | $HEAD "> "
        echo ""
	echo "Unpacking log:"
	cat $LOG.pkg | grep -v "^$" | sed 's/^/> /g' | sed "s/$SED//g"
        echo "."
}

_warning() {
echo "attenzione"
}

_spam () {
        echo "From: \"Anti-Spam Agent\" <$MAIL>"
        echo "To: $FROM"
        echo "Subject: Antispam action notification"
        echo ""
        echo "CONTROLLO ANTISPAM performed by KDEV"
        echo "Attenzione, un messaggio da voi inviato e' risultato positivo "
        echo "al controllo antispam del nostro mail server. Il messaggio ritenuto UCE Spam "
        echo "E' STATO BLOCCATO."
        echo ""
        echo "MITTENTE - MESSAGE FROM:"
        echo "> $FROM"
        echo ""
        echo ""
        echo "DESTINATARIO - MESSAGE RECIPIENT(s):"
        echo "> $RCPT"
        echo "."
}

cd $BASE || { echo "Cannot enter filtering area" ; exit 75 ; }
mkdir $DIR || { echo "Cannot allocate filtering space" ; exit 75 ; }   
cat > $MSG || { echo "Cannot store message for filtering" ; exit 75 ; } 

#Antispam engine watch for user preferences
ORI=$LOG.rcp                
FUO=`echo $RCPT > $ORI 2>&1`
# cross your fingers
USERNAME=`awk -F @ '{print $1}' $ORI`
FLD="/users/$USERNAME/.spamprefs"
if [ -f $FLD ] ; then
 echo ""
else
 FLD="/private/etc/mail/spamassassin/local.cf"
fi
# filter with spamassassin 
SPAMASS=`/usr/bin/spamassassin --prefs-file=$FLD < $MSG > $LOG.spm 2>&1`
STOP=`grep "X-Spam-Flag: YES" $LOG.spm`
if [ -z "$STOP" ] ; then
  echo no spam
else
 _spam | $SEND -f "" $FROM
  exit 0
fi

$UNPK -i -a +o -q -t -d -p $DIR $MSG > $LOG.pkg 2>&1 
RET="$?"
if test "$RET" -ne "0"; then
	echo "Unable to unpack message for virus scanning. (RET $RET)"
	#exit 75;
        #_warning $? | $SEND -f "" $FROM $MAIL
fi

$SCAN --macro-heuristics --recursive $MSG $DIR > $LOG.scn 2>&1 \
	|| { _virus $? | $SEND -f "" $FROM $RCPT $MAIL ; exit 0 ; }

# Send message...
{ echo "X-Antivirus-Data: $VERS" ; cat $MSG ; } | $SEND -f $FROM $RCPT
exit 0