#! /bin/sh
#
# snf-server	Starts and stops the SNFServer daemon (Ubuntu).
#
# Author: Alban Deniz
#
# Copyright (C) 2008 ARM Research Labs, LLC.
# See www.armresearch.com for the copyright terms.
#
### BEGIN INIT INFO
# Provides:          SNFServer
# Required-Start:    $syslog $remote_fs $network $named
# Should-Start: $time ypbind smtp
# Required-Stop:     $syslog $remote_fs
# Should-Stop: $time ypbind smtp
# Default-Start:     3 4 5
# Default-Stop:      0 1 2 6
# Short-Description: SNFServer providing email filtering.
# Description:       Start SNFServer to filter email for spam,
#	blacklist IP addresses, etc.
### END INIT INFO

# Directory to run in.
runDir=PREFIX/share/PACKAGE_NAME

# Define mode files.
debugModeFile=$runDir/debug_mode
productionModeFile=$runDir/production_mode

# Set debug mode flag.
if [ -f $debugModeFile ]
then
    debugMode=true
fi

# Debug output file.
debugOutputFile=/var/log/PACKAGE_NAME/debug.log

# Location of installation.
installedDir="PREFIX"

# Location of programs.
dir="$installedDir/sbin"

# Name of config file.
configFile="CONFFILE"

# Name of daemon.
debugProg="SNFDebugServer"
productionProg="SNFServer"

# Name of client.
clientProg="SNFClient"

# Name of user to run as.
userName="snfuser"

# Name of group.
groupName=$userName

# Name of lockfile.
lockFile="/var/lock/subsys/$productionProg"

# Name of client.
clientProg="SNFClient"

# Do NOT "set -e"

# PATH should only include /usr/* if it runs after the mountnfs.sh script
PATH=/usr/sbin:/usr/bin:/sbin:/bin
DESC="SNFServer providing email filtering"
NAME="snf-server"

DEBUG_DAEMON="/usr/bin/strace"
DEBUG_DAEMON_ARGS="-r -tt -v $dir/$debugProg $configFile"

PRODUCTION_DAEMON=$dir/$productionProg
PRODUCTION_DAEMON_ARGS="$configFile"

SCRIPTNAME=/etc/init.d/$NAME

# Exit if the package is not installed
[ -x "$PRODUCTION_DAEMON" ] || exit 0

# Read configuration variable file if it is present
[ -r /etc/default/$NAME ] && . /etc/default/$NAME

# Load the VERBOSE setting and other rcS variables
[ -f /etc/default/rcS ] && . /etc/default/rcS

# Define LSB log_* functions.
# Depend on lsb-base (>= 3.0-6) to ensure that this file is present.
. /lib/lsb/init-functions

#
# Function to create the mode file.
#
createModeFile()
{
    fileName=$1

    # Remove any existing mode files.
    rm -f $productionModeFile $debugModeFile $fileName
    (
	echo "PACKAGE_NAME mode file"
	echo
	echo "This file specifies whether PACKAGE_NAME is configured to run in"
	echo "production mode or debug mode.  If the name of this file is"
        echo "'production_mode', then PACKAGE_NAME is configured to run in"
        echo "production mode.  If the name is 'debug_mode', then PACKAGE_NAME is"
        echo "configured to run in debug mode."
	echo
	echo "To run in debug mode:"
	echo
	echo "    1) Run 'PACKAGE_NAME debug_mode'"
	echo
	echo "    2) Run 'PACKAGE_NAME restart' (if PACKAGE_NAME is already running),"
	echo "       or 'PACKAGE_NAME start' (to start PACKAGE_NAME)"
	echo
	echo "To run in production mode:"
	echo
	echo "    1) Run 'PACKAGE_NAME production_mode'"
	echo
	echo "    2) Run 'PACKAGE_NAME restart' (if PACKAGE_NAME is already running),"
	echo "       or 'PACKAGE_NAME start' (to start PACKAGE_NAME)"
	echo
	echo "By default, PACKAGE_NAME is configured to run in production mode."
	) > $fileName

}

#
# 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
	start-stop-daemon --chuid $userName --start --quiet \
	    --exec $PRODUCTION_DAEMON --test > /dev/null 2>&1 \
	    || return 1

	if [ $debugMode ]
	then

	    # Enable core dumps.
	    ulimit -c unlimited

	    # Add date to the debug file.
	    echo "Starting $DEBUG_DAEMON $DEBUG_DAEMON_ARGS on " $(date) >> \
		$debugOutputFile
            chown $userName:$groupName $debugOutputFile

	    # Start with output redirected.
	    start-stop-daemon --chuid $userName --start --quiet \
		--chdir $runDir \
		--exec $DEBUG_DAEMON -- $DEBUG_DAEMON_ARGS >> \
		$debugOutputFile 2>&1 \
		|| return 2 &
	else

	    start-stop-daemon --chuid $userName --start --quiet \
		--chdir $runDir \
		--background --exec $PRODUCTION_DAEMON -- \
		$PRODUCTION_DAEMON_ARGS > /dev/null 2>&1 || return 2
	fi

	# Check that process started.
	$dir/$clientProg -status.second > /dev/null 2>&1
	RETVAL=$?
	if [ $RETVAL -ne 0 ]; then
	    RETVAL=2
	fi
	return $RETVAL
}

#
# 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
        # Check whether SNFServer is running.
	start-stop-daemon --chuid $userName --start --quiet \
	    --exec $PRODUCTION_DAEMON --test > /dev/null
	RETVAL=$?

	if [ $RETVAL -ne 1 ]; then
	    return 1
	fi

	# Issue shutdown command
	$dir/$clientProg -shutdown > /dev/null 2>&1
	sleep 10

        # Check again whether SNFServer is running.
	start-stop-daemon --chuid $userName --start --quiet \
	    --exec $PRODUCTION_DAEMON --test > /dev/null
	RETVAL=$?

	if [ $RETVAL -eq 1 ] ; then
	    # Send TERM signal to stop SNFServer.
	    start-stop-daemon --stop --quiet --retry=TERM/5 --exec $PRODUCTION_DAEMON
	    RETVAL="$?"
	    [ "$RETVAL" = 2 ] && return 2
	    return "$RETVAL"
	fi

	# SNFServer isn't running.
	return 0

}

case "$1" in
  start)
	[ "$VERBOSE" != no ] && log_daemon_msg "Starting $DESC" "$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 $DESC" "$NAME"
	do_stop
	case "$?" in
		0|1) [ "$VERBOSE" != no ] && log_end_msg 0 ;;
		2) [ "$VERBOSE" != no ] && log_end_msg 1 ;;
	esac
	;;
  status)
	start-stop-daemon --chuid $userName --start --quiet \
	    --exec $PRODUCTION_DAEMON --test > /dev/null
	RETVAL=$?
	if [ $RETVAL -eq 0 ]; then
	    # Stopped
	    echo "$productionProg is stopped"
	else
	    # Running
	    echo "$productionProg (pid $(pidof $PRODUCTION_DAEMON)) is running"
	fi
	;;
  restart|force-reload)
	#
	# If the "reload" option is implemented then remove the
	# 'force-reload' alias
	#
	log_daemon_msg "Restarting $DESC" "$NAME"
	do_stop
	case "$?" in
	  0|1)
		do_start
		case "$?" in
			0) log_end_msg 0 ;;
			1) log_end_msg 1 ;; # Old process is still running
			*) log_end_msg 1 ;; # Failed to start
		esac
		;;
	  *)
	  	# Failed to stop
		log_end_msg 1
		;;
	esac
	;;
  debug_mode)
	#
	# Remove any mode flags, and create the debug_mode file.
	#
	log_daemon_msg "Switching to debug mode $DESC" "$NAME"
	createModeFile $debugModeFile
	;;
  production_mode)
	#
	# Remove any mode flags, and create the production_mode file.
	#
	log_daemon_msg "Switching to production mode $DESC" "$NAME"
	createModeFile $productionModeFile
	;;
  *)
	echo "Usage: $SCRIPTNAME {start|stop|status|restart|force-reload|production_mode|debug_mode}" >&2
	exit 3
	;;
esac
