#! /bin/sh
### BEGIN INIT INFO
# Provides:          ntop
# Required-Start:    $remote_fs $syslog
# Required-Stop:     $remote_fs $syslog
# Default-Start:     2 3 4 5
# Default-Stop:      0 1 6
### END INIT INFO

DAEMON="/usr/sbin/ntop"
NAME="ntop"
DESC="network top daemon"
INIT="/etc/default/ntop"
HOMEDIR="/var/lib/ntop"
LOGDIR="/var/log/ntop"

# Workaround for a rrd problem, see #471862.
export LANG=C
# end of workaround

test -f $DAEMON || exit 0

test -f $INIT || exit 0

. $INIT

sanity_check() {
# Sanity check, we expect USER And INTERFACES to be defined
# (we could also set defaults for them before calling INIT...)
	if [ -z "$USER" ] ; then
		echo -n "ERROR: Cannot start ntop since USER is not defined, check the configuration file $INIT" >&2
		return 1
	fi
	if [ -z "$INTERFACES" ] ; then
		echo "ERROR: Cannot start ntop since INTERFACES is not defined, check the configuration file $INIT" >&2
		return 1
	fi
	return 0
}

check_log_dir() {
# Does the logging directory belong to the User running the application
        # If we cannot determine the logdir return without error
        # (we will not check it)
        [ -n "$LOGDIR" ] || return 0
        [ -n "$USER" ] || return 0
        if [ ! -e "$LOGDIR" ] ; then
                echo -n "ERR: logging directory $LOGDIR does not exist"
                return 1
        elif [ ! -d "$LOGDIR" ] ; then
                echo -n "ERR: logging directory $LOGDIR does not exist"
                return 1
        else
                real_log_user=`stat -c %U $LOGDIR`
        # An alternative way is to check if the the user can create
        # a file there...
                if [ "$real_log_user" != "$USER" ] ; then
                        echo -n "ERR: logging directory $LOGDIR does not belong
to the user $USER"
                        return 1
                fi
        fi
        return 0
}

check_interfaces() {
# Check the interface status, abort with error if a configured one is not
# available
	[ -z "$INTERFACES" ] && return 0
	{ echo $INTERFACES | awk -F , '{ for(i=1;i<=NF;i++) print $i }' |
	while read iface ; do
		if ! ifconfig "$iface" | grep -w UP >/dev/null; then
			echo "ERR: interface $iface is DOWN..."
			return 1
		fi	
	done
	return 0
	} 
	return $?
}



case "$1" in
start)
  if pidof $DAEMON > /dev/null ; then
     echo "Not starting $DESC, it has already been started."
     exit 0
  fi
  echo -n "Starting $DESC: "
  if ! sanity_check || ! check_log_dir || ! check_interfaces; then
  	echo " will not start $DESC!"
	exit 1
  fi
  start-stop-daemon --start --quiet --name $NAME --exec $DAEMON -- \
  -d -L -u $USER -P $HOMEDIR \
  --access-log-file=$LOGDIR/access.log -i "$INTERFACES" \
  -p /etc/ntop/protocol.list \
  -O $LOGDIR $GETOPT
  if pidof $DAEMON > /dev/null ; then
      echo ntop
  else
  # WARNING: This might introduce a race condition in some (fast) systems
  # Wait for a sec an try again
      sleep 1
      if ps xa | grep -v grep | grep $DAEMON > /dev/null ; then
      	echo ntop
      else
        echo "ntop not started. Read /usr/share/doc/ntop/README.Debian."
	exit 1
      fi
  fi
  ;;
stop)
  echo -n "Stopping $DESC: "
  start-stop-daemon --stop --oknodo --name $NAME --user $USER --retry 9
  if pidof $DAEMON > /dev/null ; then
  # WARNING: This might introduce a race condition in some (fast) systems
  # Wait for a sec an try again
      sleep 1 
      if ps xa | grep -v grep | grep $DAEMON > /dev/null ; then
         echo "Ntop not stopped. Need to kill manually."
	 exit 1
      else 
         echo ntop
      fi
  else
      echo ntop
  fi
  ;;
restart | force-reload)
  $0 stop
  sleep 2
  $0 start
  ;;
reload)
  echo "reload option not implemented"
  exit 3
  ;;
*)
  N=/etc/init.d/$NAME
  echo "Usage: $N {start|stop|restart|force-reload|reload}" >&2
  exit 1
  ;;
esac
exit 0