Re: Snort Startup Script

[Paul Schmehl <pauls () utdallas edu>]

--On Monday, April 18, 2005 03:21:08 PM -0700 dogbert () netnevada net wrote:
> # !/bin/bash
> # $Id: S99snort,v 1.1 2001/12/18 22:14:37 cazz Exp $
> # /etc/init.d/snort : start or stop the SNORT Intrusion Database System
> #
> # Written by Lukasz Szmit <ptashek () scg gliwice pl>
> #
> # Configuration
>
> # set config file & path to snort executable
> SNORT_PATH=/usr/local/bin
> # CONFIG=/usr/local/share/snort/snort.conf
> CONFIG=/usr/local/etc/snort.conf
>
> # set interface
> IFACE=eth1
>
> # set GID/Group Name
> SNORT_GID=nobody
>
> # other options
> OPTIONS="-D -b"
>
> # End of configuration
>
>
> test -x $SNORT_PATH/snort || exit 0
>
> # is snort already running, if so, exit...
>
> case "$1" in
>      start)
>
> # check to see if snort is already running, if so, exit...
>
>         if [ -e /var/run/snort* ]; then
>             echo Snort already running...exiting...
>             exit 0
>         fi
> #
>         echo "Starting Intrusion Database System: SNORT"
>         $SNORT_PATH/snort -c $CONFIG -i $IFACE -g $SNORT_GID $OPTIONS
>         if [ "`pidof $SNORT_PATH/snort`" ]; then
>                 echo "SNORT is up and running!"
>         else
>                 exit 0
>         fi
>         echo -n "."
>         ;;
>
> I only posted up thru the start) section, but my question becomes, is
> this the  correct way to determine if snort is already running, or do
> other readers have  a better idea or way to do this?
This does nothing except verify that an executable file named snort exists 
in /usr/local/bin.  If you want to test to see if snort is running, you 
have to look at running processes.

Something along these lines should work (but not tested, so YMMV):

PID=`ps auxw | grep $SNORT_PATH/snort | grep -v grep | awk '{print $2}'`
if [ $PID > 0 ]; then
 echo "Snort is already running"
 exit 1
fi

You *could* check for the existence of the pidfile, but that's not *always* 
a guarantee that the process is actually running.  Safer to look at the 
processes themselves.  Also, if you have pgrep on your system, you can use 
that instead:

PID=`pgrep snort`
etc.

Paul Schmehl (pauls () utdallas edu)
Adjunct Information Security Officer
The University of Texas at Dallas
AVIEN Founding Member
http://www.utdallas.edu


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