#! /bin/sh

# postgrey      start/stop the postgrey greylisting deamon for postfix
#               (priority should be smaller than that of postfix)
#
# Author:       (c)2004-2006 Adrian von Bidder <avbidder@fortytwo.ch>
#               Based on Debian sarge's 'skeleton' example
#               Distribute and/or modify at will.
#
# Version:      $Id: postgrey.init 1436 2006-12-07 07:15:03Z avbidder $
#               altered by Georg Lauterbach as aendeavor 2020-11.05 14:02:00Z

### BEGIN INIT INFO
# Provides:          postgrey
# Required-Start:    $syslog $local_fs $remote_fs
# Required-Stop:     $syslog $local_fs $remote_fs
# Default-Start:     2 3 4 5
# Default-Stop:      0 1 6
# Short-Description: Start/stop the postgrey daemon
### END INIT INFO

set -e

PATH='/sbin:/bin:/usr/sbin:/usr/bin'
DAEMON='/usr/sbin/postgrey'
DAEMON_NAME='postgrey'
DESC='postfix greylisting daemon'
DAEMON_USER='postgrey'

PIDFILE="/var/run/${DAEMON_NAME}/${DAEMON_NAME}.pid"
SCRIPTNAME="/etc/init.d/${DAEMON_NAME}"

# gracefully exit if the package has been removed.
[ -x "${DAEMON}" ] || exit 0

# shellcheck source=/dev/null
. /lib/lsb/init-functions

# Read config file if it is present.
# shellcheck source=/dev/null
[ -r "/etc/default/${DAEMON_NAME}" ] && . "/etc/default/${DAEMON_NAME}"

POSTGREY_OPTS="--pidfile=${PIDFILE} --daemonize ${POSTGREY_OPTS}"

if [ -z "${POSTGREY_TEXT}" ]; then
    POSTGREY_TEXT_OPT=""
else
    POSTGREY_TEXT_OPT="--greylist-text=${POSTGREY_TEXT}"
fi

ret=0

do_start()
{
    # Return
    #   0 if daemon has been started
    #   1 if daemon was already running
    #   2 if daemon could not be started
    start-stop-daemon --start --quiet --pidfile \
		"${PIDFILE}" --exec "${DAEMON}" --test >/dev/null  || return 1

	start-stop-daemon --start --quiet --pidfile \
		"${PIDFILE}" --exec "${DAEMON}" -- "${POSTGREY_OPTS}" \
		"${POSTGREY_TEXT_OPT}" || return 2
}

do_stop()
{
	# Return
	#   0 if daemon has been stopped
	#   1 if daemon was already stopped
	#   2 if daemon could not be stopped
	#   other if a failure occurred
    start-stop-daemon --user "${DAEMON_USER}" --stop --quiet \
		--retry=TERM/30/KILL/5 --pidfile "${PIDFILE}"

	RETVAL="$?"
    [ "${RETVAL}" -eq 2 ] && return 2

	# Wait for children to finish too if this is a daemon that forks
	# and if the daemon is only ever run from this initscript.
	# If the above conditions are not satisfied then add some other code
	# that waits for the process to drop all resources that could be
	# needed by services started subsequently.  A last resort is to
	# sleep for some time.
	start-stop-daemon --user "${DAEMON_USER}" --stop --quiet \
		--oknodo --retry=0/30/KILL/5 --exec "${DAEMON}"
	[ "$?" -eq 2 ] && return 2

	# Many daemons don't delete their pidfiles when they exit.
	rm -f "${PIDFILE}"
	return "${RETVAL}"
}

do_reload()
{
	#
	# If the daemon can reload its configuration without
	# restarting (for example, when it is sent a SIGHUP),
	# then implement that here.
	#
	start-stop-daemon --stop --signal 1 --quiet --pidfile "${PIDFILE}"
	return 0
}

case "${1}" in
  start )
	[ "${VERBOSE}" != no ] && log_daemon_msg "Starting ${DESC}" "${DAEMON_NAME}"
	do_start

	case "${?}" in
		0|1) [ "${VERBOSE}" != no ] && log_end_msg 0 ;;
		2) [ "${VERBOSE}" != no ] && log_end_msg 1 ;;
	esac
    ;;

  stop )
	[ "${VERBOSE}" != no ] && log_daemon_msg "Stopping ${DESC}" "${DAEMON_NAME}"
    do_stop

	case "${?}" in
		0|1) [ "${VERBOSE}" != no ] && log_end_msg 0 ;;
		2) [ "${VERBOSE}" != no ] && log_end_msg 1 ;;
	esac
    ;;

  reload|force-reload)
	[ "${VERBOSE}" != no ] && log_daemon_msg "Reloading ${DESC}" "${DAEMON_NAME}"
    do_reload

	case "${?}" in
		0|1) [ "${VERBOSE}" != no ] && log_end_msg 0 ;;
		2) [ "${VERBOSE}" != no ] && log_end_msg 1 ;;
	esac
    ;;

  restart )
    do_stop
    do_start
    ;;

  status )
    status_of_proc -p "${PIDFILE}" "${DAEMON}" "${DAEMON_NAME}" 2>/dev/null
    ret=${?}
    ;;

  * )
    echo "Usage: ${SCRIPTNAME} {start|stop|restart|reload|force-reload|status}" >&2
    exit 1
    ;;
esac

exit ${ret}