#!/bin/sh
to=$1
from=$2
destination=$3
sendmail=/usr/sbin/sendmail
#
#	Unpack attachments, test for virus:
#
tmpdir=/var/tmp/scanmails$$
mkdir $tmpdir
chmod 700 $tmpdir
cat >$tmpdir/receivedmail
mkdir $tmpdir/unpacked
METAMAIL_TMPDIR=$tmpdir/unpacked
export METAMAIL_TMPDIR

echo scanmails called $1 $2 $3 $4 > $tmpdir/logfile

metamail -x -w $tmpdir/receivedmail >> $tmpdir/logfile 2>&1

# for each file in unpacked, unpack zip, tar, and binhex archives recursively:

cd $tmpdir/unpacked
doneit=0
maxlevel=0

while test $doneit -eq 0 -a $maxlevel -lt 20
do
  echo maxlevel: $maxlevel >>$tmpdir/logfile
  doneit=1
  for E in `find . -print`
  do
    # test for zip file
    file $E|fgrep -q "Zip archive data"
    if test $? -eq 0
    then
      echo Unziping $E >> $tmpdir/logfile
      unzip $E >>$tmpdir/logfile 2>&1
      rm $E
      doneit=0
    fi

    # test for tar archive
    file $E|fgrep -q "tar archive"
    if test $? -eq 0
    then
      echo Untaring $E >> $tmpdir/logfile
      tar xvf $E >>$tmpdir/logfile 2>&1
      rm $E
      doneit=0
    fi

    # test for compressed file
    file $E|fgrep -q "compress'd"
    if test $? -eq 0
    then
      echo Uncompressing $E >> $tmpdir/logfile
      uncompress $E
      doneit=0
    fi

    # test for binhex file
    head -4 $E|fgrep -q "(This file must be converted with BinHex 4.0)"
    if test $? -eq 0
    then
      echo Unpacking binhex file $E >> $tmpdir/logfile
      xbin $E
      rm $E $E.info $E.rsrc
      mv $E.data $E
      doneit=0
    fi

    # test for uuencoded file
    grep -q "begin [0-7][0-7][0-7]" $E
    if test $? -eq 0
    then
      echo Unpacking uuencoded file $E >> $tmpdir/logfile
      uudecode --output-file=uudecode.$maxlevel $E
      rm $E
      doneit=0
    fi
  done
  maxlevel=`expr $maxlevel + 1`
done

echo Contents of $tmpdir/unpacked >> $tmpdir/logfile
ls -lR $tmpdir/unpacked >> $tmpdir/logfile

uvscan --recursive --summary --verbose $tmpdir/unpacked >> $tmpdir/logfile 2>&1
scanstatus=$?

echo Scanstatus is: $scanstatus >> $tmpdir/logfile

if test $scanstatus -eq 1 -o $scanstatus -eq 3
then
  # A virus was found: Mail it to virusalert
  echo Virus FOUND Sent to virusalert >> $tmpdir/logfile
  uuencode receivedmail <$tmpdir/receivedmail >$tmpdir/receivedmail.uu
  echo Subject: mail.crc.dk VIRUSALERT from: $from, to: $to, destination: $destination >$tmpdir/virusmail
  echo >> $tmpdir/virusmail
  echo The attached mail has been found to contain a virus >>$tmpdir/virusmail
  echo Originally from: $from >>$tmpdir/virusmail
  echo Originally to: $to >>$tmpdir/virusmail
  echo Original destination: $destination >>$tmpdir/virusmail
  echo >> $tmpdir/virusmail
  cat $tmpdir/virusmail $tmpdir/logfile $tmpdir/receivedmail.uu | $sendmail virusalert@mail.cfc.dk..virscanned
else
  # No virus, send as usual
  echo No virus found - good >> $tmpdir/logfile
  $sendmail -f $from $to@$destination.virscanned <$tmpdir/receivedmail
  $sendmail virusalert <$tmpdir/logfile
fi

# clean up
rm -rf $tmpdir