#!/bin/sh
### BEGIN INIT INFO
# Provides:          osmocom-tcpdump
# Required-Start:    $remote_fs $network
# Should-Start:      udev
# Required-Stop:     $remote_fs $network
# Default-Start:     2 3 4 5
# Default-Stop:      0 1 6
### END INIT INFO

# Do NOT "set -e"

# PATH should only include /usr/* if it runs after the mountnfs.sh script
PATH=/sbin:/usr/sbin:/bin:/usr/bin
DESC="Osmocom traffic capture"
NAME="tcpdump"
DAEMON=/usr/sbin/$NAME
PIDFILE=/var/run/osmocom-tcpdump-$NAME.pid
SCRIPTNAME=/etc/init.d/osmocom-tcpdump


CAPTURE_ENABLED="0"
CAPTURE_LIMIT="8"
CAPTURE_SIZE="1"
CAPTURE_BASENAME="/tmp/tcpdump-capture-"
CAPTURE_COMPRESS="-z /usr/sbin/tcpdump-compress"

if [ -e /etc/default/osmocom-tcpdump ]; then
	. /etc/default/osmocom-tcpdump
fi


CAPTURE_OPTIONS="-pi $CAPTURE_DEVICE -s0 -w $CAPTURE_BASENAME -C $CAPTURE_SIZE -W $CAPTURE_LIMIT $CAPTURE_COMPRESS"

#
# Function that starts the daemon/service
#
do_start()
{
	# Return
	#   0 if daemon has been started
	#   1 if daemon was already running
	#   2 if daemon could not be started
	if [ -z "$CAPTURE_DEVICE" -o -z "$CAPTURE_FILTER" ]; then
		echo "Unable to start $DESC" "$NAME" "(unconfigured)"
		exit 2
	fi
	if [ "$CAPTURE_ENABLED" != "1" ]; then
		echo "Not starting $DESC" "$NAME" "(disabled)"
		exit 0
	fi
	#start-stop-daemon --start --quiet --pidfile $PIDFILE --exec $DAEMON --test > /dev/null \
	#	|| return 1
	echo "Starting $DESC" "$NAME"
	start-stop-daemon --start --quiet --pidfile $PIDFILE --exec $DAEMON \
		--background --make-pidfile -- $CAPTURE_OPTIONS $CAPTURE_FILTER \
		|| return 2
}

#
# Function that stops the daemon/service
#
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
	echo "Stopping $DESC" "$NAME"
	start-stop-daemon --stop --quiet --retry=TERM/30/KILL/5 --pidfile $PIDFILE --name $NAME
	RETVAL="$?"
	[ "$RETVAL" = 2 ] && return 2
	# Many daemons don't delete their pidfiles when they exit.
	rm -f $PIDFILE
	return "$RETVAL"
}

case "$1" in
  start)
	do_start
	exit $?
	;;
  stop)
	do_stop
	exit $?
	;;
  restart)
	#
	# If the "reload" option is implemented then remove the
	# 'force-reload' alias
	#
	do_stop
	case "$?" in
	  0|1)
		do_start
		exit $?
		;;
	  *)
		# Failed to stop
		exit 1
		;;
	esac
	;;
  *)
	echo "Usage: $SCRIPTNAME {start|stop|restart}" >&2
	exit 3
	;;
esac

: