#!/bin/sh
INSPECT_DIR=/tmp #Каталог куда будут сохраняться письма для сканирования
SENDMAIL="/usr/sbin/sendmail -i"
VIRUSADMIN="admin@test.lan" # адрес для уведомлениий

EX_TEMPFAIL=75
EX_UNAVAILABLE=69

# строка для запуска spamassassin
FILTER_SPAMC="/usr/bin/spamc -u nobody -U /var/run/spamd.sock"

trap "rm -f $INSPECT_DIR/in.$$ $INSPECT_DIR/vr.$$ $INSPECT_DIR/vr1.$$" 0 1 2 3 15

# Проверка на спам
cat | $FILTER_SPAMC > $INSPECT_DIR/in.$$ || { echo Cannot save mail to file; exit $EX_TEMPFAIL; }

# Проверка на вирусы
/usr/local/bin/clamscan -v -r --no-summary --stdout ${INSPECT_DIR}/in.$$>$INSPECT_DIR/vr.$$

# Результат проверки
AV_RESULT=$?

case "$AV_RESULT" in
0)
  # Проверено. Мин нет :)
  $SENDMAIL "$@" <${INSPECT_DIR}/in.$$
  exit 0
  ;;
1)
  # Обнаружен вирус. Посылаем уведомление админу
  echo "Subject: VIRUS FOUND" >> $INSPECT_DIR/vr1.$$
  echo >> $INSPECT_DIR/vr1.$$
  echo "************************************************" >> $INSPECT_DIR/vr1.$$
  echo "* MAIL                                         *" >> $INSPECT_DIR/vr1.$$
  echo "************************************************" >> $INSPECT_DIR/vr1.$$
  echo >> $INSPECT_DIR/vr1.$$
  # Включаем в отчет реальные адреса релеев
  grep Received $INSPECT_DIR/in.$$ >> $INSPECT_DIR/vr1.$$
  echo "Mail from: $2 (may be forget)" >> $INSPECT_DIR/vr1.$$
  echo "To: $4" >> $INSPECT_DIR/vr1.$$
  grep Subject $INSPECT_DIR/in.$$ >> $INSPECT_DIR/vr1.$$
  echo >> $INSPECT_DIR/vr1.$$
  echo "************************************************" >> $INSPECT_DIR/vr1.$$
  echo "* Virus(es)                                    *" >> $INSPECT_DIR/vr1.$$
  echo "************************************************" >> $INSPECT_DIR/vr1.$$
  # Включаем в отчет список вирусов
  cat $INSPECT_DIR/vr.$$ >> $INSPECT_DIR/vr1.$$
  cat $INSPECT_DIR/vr.$$ >> /var/log/virusmail
  $SENDMAIL -f $VIRUSADMIN -r $VIRUSADMIN -F "Antivirus" $VIRUSADMIN < $INSPECT_DIR/vr1.$$
  exit 0
  ;;
*)
  # Произошла ошибка в работе антивируса. Сообщим об ошибке админу
  echo "Subject: ANTIVIRUS FAILED" >> $INSPECT_DIR/vr1.$$
  echo >> $INSPECT_DIR/vr1.$$
  echo "************************************************" >> $INSPECT_DIR/vr1.$$
  echo "* Antivirus Failed with next problem           *" >> $INSPECT_DIR/vr1.$$
  echo "************************************************" >> $INSPECT_DIR/vr1.$$
  case "$AV_RESULT" in
    40)
       echo "* Unknown option passed.                       *" >> $INSPECT_DIR/vr1.$$
       ;;
    50)
       echo "* Database initialization error.               *" >> $INSPECT_DIR/vr1.$$
       ;;
    52)
       echo "* Not supported file type.                     *" >> $INSPECT_DIR/vr1.$$
       ;;
    53)
       echo "* Can't open directory.                        *" >> $INSPECT_DIR/vr1.$$
       ;;
    54)
       echo "* Can't open file. (ofm)                       *" >> $INSPECT_DIR/vr1.$$
       ;;
    55)
       echo "* Error reading file. (ofm)                    *" >> $INSPECT_DIR/vr1.$$
       ;;
    56)
       echo "* Can't stat input file / directory.           *" >> $INSPECT_DIR/vr1.$$
       ;;
    57)
       echo "* Can't get absolute path name of current      *" >> $INSPECT_DIR/vr1.$$
       echo "* working directory.                           *" >> $INSPECT_DIR/vr1.$$
       ;;
    58)
       echo "* I/O error, please check your filesystem.     *" >> $INSPECT_DIR/vr1.$$
       ;;
    59)
       echo "* Can't get information about current user     *" >> $INSPECT_DIR/vr1.$$
       echo "* from /etc/passwd.                            *" >> $INSPECT_DIR/vr1.$$
       ;;
    60)
       echo "* Can't  get  information  about  user         *" >> $INSPECT_DIR/vr1.$$
       echo "* clamav (default name) from /etc/passwd.      *" >> $INSPECT_DIR/vr1.$$
       ;;
    61)
       echo "* Can't fork.                                  *" >> $INSPECT_DIR/vr1.$$
       ;;
    63)
       echo "* Can't create temporary files/directories     *" >> $INSPECT_DIR/vr1.$$
       echo "* (check permissions).                         *" >> $INSPECT_DIR/vr1.$$
       ;;
    64)
       echo "* Can't write to temporary directory (please   *" >> $INSPECT_DIR/vr1.$$
       echo "* specify another one).                        *" >> $INSPECT_DIR/vr1.$$
       ;;
    70)
       echo "* Can't allocate and clear memory (calloc).    *" >> $INSPECT_DIR/vr1.$$
       ;;
    71)
       echo "* Can't allocate memory (malloc).              *" >> $INSPECT_DIR/vr1.$$
       ;;
    *)
       echo "Unknown error $AV_RESULT" >> $INSPECT_DIR/vr1.$$
       ;;
  esac
       echo "************************************************" >> $INSPECT_DIR/vr1.$$
  $SENDMAIL -f $VIRUSADMIN -r $VIRUSADMIN -F "Antivirus" "$VIRUSADMIN" < $INSPECT_DIR/vr1.$$
  exit $EX_TEMPFAIL
  ;;
esac

exit 0