fail2ban/debian/fail2ban.init

#! /bin/sh
### BEGIN INIT INFO
# Provides:          fail2ban
# Required-Start:    $local_fs $remote_fs
# Required-Stop:     $local_fs $remote_fs
# Should-Start:      $time $network $syslog iptables firehol shorewall ipmasq
# Should-Stop:       $network $syslog iptables firehol shorewall ipmasq
# Default-Start:     2 3 4 5
# Default-Stop:      0 1 6
# Short-Description: Start/stop fail2ban
# Description:       Start/stop fail2ban, a daemon scanning the log files and
#                    banning potential attackers.
### END INIT INFO

# Author: Aaron Isotton <aaron@isotton.com>
# Modified: by Yaroslav Halchenko <debian@onerussian.com>
#  reindented + minor corrections + to work on sarge without modifications
#
PATH=/usr/sbin:/usr/bin:/sbin:/bin
DESC="authentication failure monitor"
NAME=fail2ban

# fail2ban-client is not a daemon itself but starts a daemon and
# loads its with configuration
DAEMON=/usr/bin/$NAME-client
SOCKFILE=/tmp/$NAME.sock
SCRIPTNAME=/etc/init.d/$NAME

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

# Read configuration variable file if it is present
[ -r /etc/default/$NAME ] && . /etc/default/$NAME
DAEMON_ARGS="$FAIL2BAN_OPTS"

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

# Predefine what can be missing from lsb source later on -- necessary to run
# on sarge. Just present it in a bit more compact way from what was shipped
log_daemon_msg () {
	[ -z "$1" ] && return 1
	echo -n "$1:"
	[ -z "$2" ] || echo -n " $2"
}

# Define LSB log_* functions.
# Depend on lsb-base (>= 3.0-6) to ensure that this file is present.
# Actually has to (>=2.0-7) present in sarge. log_daemon_msg is predefined
#  so we must be ok
. /lib/lsb/init-functions

#
# 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
	do_status && return 1
	start-stop-daemon --start --quiet --chuid root --exec $DAEMON -- \
		$DAEMON_ARGS start > /dev/null\
		|| return 2
}

#
# Shortcut function for abnormal init script interruption
#
report_bug()
{
	echo $*
	echo "Please submit a bug report to Debian BTS (reportbug fail2ban)"
	exit 1
}

#
# Function that checks the status of fail2ban and returns
# corresponding code
#
do_status()
{
	$DAEMON status > /dev/null
	case $? in
		0) return 0
			;;
		255)
			if [ -S $SOCKFILE ]; then
				if [ -r $SOCKFILE ]; then
					return 1
				else
					return 4
				fi
			else
				return 3
			fi
			;;
		*)
			report_bug "Unknown return code from fail2ban."
	esac
}

#
# 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
	$DAEMON status > /dev/null || return 1
	$DAEMON stop > /dev/null || return 2
	return 0
}

#
# Function to reload configuration
#
do_reload() {
	$DAEMON reload > /dev/null && return 0 || return 1
	return 0
}

# yoh:
# shortcut function to don't duplicate case statements and to don't use
# bashisms (arrays). Fixes #368218
#
log_end_msg_wrapper()
{
	[ $1 -lt $2 ] && value=0 || value=1
	log_end_msg $value
}

case "$1" in
	start)
		[ "$VERBOSE" != no ] && log_daemon_msg "Starting $DESC" "$NAME"
		do_start
		[ "$VERBOSE" != no ] && log_end_msg_wrapper $? 2
		;;
	stop)
		[ "$VERBOSE" != no ] && log_daemon_msg "Stopping $DESC" "$NAME"
		do_stop
		[ "$VERBOSE" != no ] && log_end_msg_wrapper $? 2
		;;
	restart|force-reload)
		log_daemon_msg "Restarting $DESC" "$NAME"
		do_stop
		case "$?" in
			0|1)
                # now we need actually to wait a bit since it might take time
   		        # for server to react on client's stop request
				count=1
				while do_status && [ $count -lt 10 ]; do
					sleep 1
					count=$(($count+1))
				done

				[ $count -lt 10 ] || log_end_msg 1 # failed to stop

				do_start
				log_end_msg_wrapper $? 1
				;;
			*)
				# Failed to stop
				log_end_msg 1
				;;
 		esac
		;;

	reload|force-reload)
        log_daemon_msg "Reloading $DESC" "$NAME"
        do_reload
        log_end_msg $?
        ;;

	status)
		log_daemon_msg "Status of $DESC"
		do_status
		case $? in
			0)  log_success_msg " $NAME is running" ;;
			1)  log_failure_msg " $NAME is not running but $SOCKFILE exists" ;;
			3)  log_warning_msg " $NAME is not running" ;;
			4)  log_failure_msg " $SOCKFILE not readable, status of $NAME unknown";;
			*)  report_bug "Unknown status code"
		esac
		;;
	*)
		echo "Usage: $SCRIPTNAME {start|stop|restart|force-reload|status}" >&2
		exit 3
		;;
esac

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