Snort startup script for Ubuntu

#! /bin/sh
### BEGIN INIT INFO
# Provides:          Snort
# Required-Start:    $local_fs $remote_fs $syslog $network mysql
# Required-Stop:     $local_fs $remote_fs $syslog $network mysql
# Default-Start:     2 3 4 5
# Default-Stop:      S 0 1 6
# Short-Description: Init script to start the Snort daemon
# Description:       Provides Snort service on startup and terminates
#                    on shutdown. Snort is an IDS or IPS. This script
#                    assumes that snort is installed in /usr/sbin and
#                    that it's main snort.conf file is in /etc/snort.
#                    The service will be started as a daemon, listening
#                    on eth0 and will also start quietly. If you require
#                    something other than this, you will have to edit
#                    the script accordingly.
#                    USE AT YOUR OWN RISK, YMMV. THIS SCRIPT COMES WITH
#                    ABSOLUTELY NO WARRANTY WHATSOEVER.
# License:           GPLv2 see http://www.gnu.org/licenses/gpl-2.0.txt
### END INIT INFO


# Author: Nigel Houghton <nigel.houghton@sourcefire.com>


PATH=/usr/sbin:/usr/bin:/sbin:/bin
DESC="Snort service for IDS or IPS"
NAME=snort
CONFIG="/usr/local/snort/etc/snort.conf"
INTERFACE="eth0"
DAEMON=/usr/local/snort/bin/$NAME
DAEMON_ARGS="-c $CONFIG -i $INTERFACE -qD -A fast -l /var/log/snort"
PIDFILE=/var/run/$NAME.pid
SCRIPTNAME=/etc/init.d/$NAME


# Exit if the package is not installed
[ -x "$DAEMON" ] || exit 1


# 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 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 --start --quiet --pidfile $PIDFILE --exec $DAEMON --test > /dev/null || return 1
        start-stop-daemon --start --quiet --pidfile $PIDFILE --exec $DAEMON -- $DAEMON_ARGS || 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
        start-stop-daemon --stop --quiet --retry=TERM/30/KILL/5 --pidfile $PIDFILE --name $NAME
        RETVAL="$?"
        [ "$RETVAL" = 2 ] && return 2
        start-stop-daemon --stop --quiet --oknodo --retry=0/30/KILL/5 --exec $DAEMON
        [ "$?" = 2 ] && return 2
        # Many daemons don't delete their pidfiles when they exit.
        if [ -f "$PIDFILE" ]; then
                rm -f $PIDFILE
        fi
        return "$RETVAL"
}


#
# Function that sends a SIGHUP to the daemon/service
#
do_reload() {
        start-stop-daemon --stop --signal 1 --quiet --pidfile $PIDFILE --name $NAME
        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
        ;;


        restart|force-reload)
        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


        ;;


        *)
        echo "Usage: $SCRIPTNAME {start|stop|restart|force-reload}" >&2
        exit 3
        ;;
esac


$ sudo chmod +x /etc/init.d/snort
$ sudo update-rc.d snort start 37 S . start 37 0 . start 37 6 .