This script is an evolution of my earlier check_ntp_config. This time it's meant for use with Tivoli, although modifying it for use with Nagios is trivial. The script was written to be usable on at least five different Unices, though i've been having trouble with Darwin/OS X.

The script was tested on Red Hat Linux, Tru64, HP-UX, AIX and Solaris. Only Darwin seems to have problems.

Just like my other recent Nagios scripts, check_ntpconfig.sh comes with a debugging option. Set $DEBUG at the top of the file to anything larger than zero and the script will dump information at various stages of its execution.

#!/usr/bin/ksh
#
# NTP configuration check script for Tivoli.
# Written by Thomas Sluyter (nagiosATkilalaDOTnl)
# By request of T-Systems, CSS-CCTMO, the Netherlands
# Last Modified: 13-09-2007
# 
# Usage: ./check_ntp_config
#
# Description:
#   Well, there's not much to tell. We have no way of making sure that our 
# NTP clients are all configured in the right way, so I thought I'd make
# a Nagios check for it. ^_^ After that came this derivative Tivoli script.
#   You can change the NTP config at the top of this script, to match your
# own situation.
#
# Limitations:
#   This script should work fine on Solaris, HP-UX, AIX, Tru64 and some
# flavors of Linux. So far Darwin-compatibility has eluded me.
#
# Output:
#   If the NTP client config does not match what has been defined at the 
# top of this script, the script will echo $STATE_NOK. In this case, the 
# STATE variables contain a zero and a one, so you'll need to use a 
# "Numeric Script" monitor definition in Tivoli. Anything above zero is bad.
#
# Other notes:
#   If you ever run into problems with the script, set the DEBUG variable
# to 1. I'll need the output the script generates to do troubleshooting.
# See below for details.
#   I realise that all the debugging commands strewn throughout the script
# may make things a little harder to read. But in the end I'm sure it was
# well worth adding them. It makes troubleshooting so much easier. :3
#

### SETTING THINGS UP ###
PATH="/usr/bin:/usr/sbin:/bin:/sbin"
PROGNAME="./check_ntp_config"
STATE_NOK="1"
STATE_OK="0"

. /opt/Tivoli/lcf/dat/dm_env.sh >/dev/null 2>&1


### DEFINING THE NTP CLIENT CONFIGURATION AS IT SHOULD BE ###
NTPSERVERS="192.168.22.7 192.168.25.7 192.168.16.7"


### DEBUGGING SETUP ###
# Cause you never know when you'll need to squash a bug or two
DEBUG="1"

if [[ $DEBUG -gt 0 ]]
then
        DEBUGFILE="/tmp/thomas-debug.txt"
	if [[ -f $DEBUGFILE ]]
	then
            rm $DEBUGFILE >/dev/null 2>&1
	    [[ $? -gt 0 ]] && echo "Removing old debug file failed."
	    touch $DEBUGFILE
	fi
fi


### REQUISITE COMMAND LINE STUFF ###

print_usage() {
	echo ""
	echo "Usage: $PROGNAME"
}

print_help() {
	echo ""
	echo "NTP client configuration monitor plugin for Tivoli."
	echo ""
	echo "This plugin not developped by IBM."
	echo "Please do not e-mail them for support on this plugin, since"
	echo "they won't know what you're talking about :P"
	echo ""
	echo "For contact info, read the plugin itself..."
	echo ""
	print_usage
	echo ""
}

while test -n "$1" 
do
	case "$1" in
	  *) print_help; exit $STATE_OK;;
	esac
done


### DEFINING SUBROUTINES ###

function SetupEnv
{
    case $(uname) in
	Linux) 	CFGFILE="/etc/ntp.conf"; 
		IPCMD="host" 
		IPMOD="tail -1"
		NAMEMOD="tail -1"
		IPFIELD="4"
		NAMEFIELD="5" 
		GREP="egrep -e" ;;
	SunOS) 	CFGFILE="/etc/inet/ntp.conf"
		IPCMD="getent hosts"
		IPMOD=""
		NAMEMOD=""
		IPFIELD="1"
		NAMEFIELD="2"
		GREP="egrep -e" ;;
	Darwin) CFGFILE="/etc/ntp.conf"
		IPCMD="host"
		IPMOD=""
		NAMEMOD=""
		IPFIELD="4"
		NAMEFIELD="1"
		GREP="egrep -e" ;;
	AIX)    CFGFILE="/etc/ntp.conf"
		IPCMD="host"
		IPMOD=""
		NAMEMOD=""
		IPFIELD="3"
		NAMEFIELD="1"
		GREP="egrep -e" ;;
	HP-UX)  CFGFILE="/etc/ntp.conf"
		IPCMD="nslookup"
		IPMOD="grep ^\"Address\""
		NAMEMOD="grep ^\"Name\""
		IPFIELD="2"
		NAMEFIELD="2"
		GREP="egrep -e" ;;
	OSF1)   CFGFILE="/etc/ntp.conf"
		IPCMD="nslookup"
		IPMOD="grep ^\"Address\" | tail -1"
		NAMEMOD="grep ^\"Name\" |tail -1"
		IPFIELD="2"
		NAMEFIELD="2"
		GREP="egrep -e" ;;
	*) echo "Sorry. OS not supported."; exit 1 ;;
    esac

    FAULT=0

    if [[ $DEBUG -gt 0 ]]
    then
	echo "=== SETUP ===" >> $DEBUGFILE
	echo "OS name is $(uname)" >> $DEBUGFILE
	echo "CFGFILE is $CFGFILE" >> $DEBUGFILE
	echo "IPCMD is $IPCMD" >> $DEBUGFILE
	echo "IPMOD is $IPMOD" >> $DEBUGFILE
	echo "NAMEMOD is $NAMEMOD" >> $DEBUGFILE
	echo "IPFIELD is $IPFIELD" >> $DEBUGFILE
	echo "NAMEFIELD is $NAMEFIELD" >> $DEBUGFILE
	echo "" >> $DEBUGFILE
	echo "NTPSERVERS is $NTPSERVERS" >> $DEBUGFILE
	echo "" >> $DEBUGFILE
    fi
} 

function ListInConf
{
    if [[ -z $NTPSERVERS ]]
    then
	echo "You haven't configured this monitor yet. Set \$NTPSERVERS."; exit 0
	[[ $DEBUG -gt 0 ]] && echo "NTPSERVERS variable not set." >> $DEBUGFILE
    else

    for HOST in $(echo $NTPSERVERS)
    do
    SKIPIP=0
    SKIPNAME=0

    if [[ $DEBUG -gt 0 ]]
    then
	echo "=== LISTINCONF ===" >> $DEBUGFILE
	echo "HOST is $HOST" >> $DEBUGFILE
	echo "" >> $DEBUGFILE
    fi

        if [[ -z $(echo $HOST | $GREP [a-z,A-Z]) ]]	    
        then
            IPADDRESS="$HOST"
	    TEST=$($IPCMD $HOST 2>/dev/null)

	    if [[ ( $? -eq 0 ) && ( -z $(echo $TEST | $GREP NXDOMAIN) ) ]] 
	    then
		[[ $DEBUG -gt 0 ]] && echo "TEST is $TEST" >> $DEBUGFILE
            	HOSTNAME=$($IPCMD $HOST 2>/dev/null | $NAMEMOD | cut -f$NAMEFIELD -d" " | cut -f1 -d.)
	    else
		[[ $DEBUG -gt 0 ]] && echo "TEST is $TEST" >> $DEBUGFILE
		HOSTNAME=""
	    fi

	    if [[ $HOSTNAME -eq "" ]]
	    then
	    	QUERY="$IPADDRESS"
	    	[[ $DEBUG -gt 0 ]] && echo "Skipping hostname verification" >> $DEBUGFILE
	    else
	    	QUERY="$HOSTNAME $IPADDRESS"	
	    	[[ $DEBUG -gt 0 ]] && echo "Checking both IP and name." >> $DEBUGFILE
	    fi
        else
            HOSTNAME="$HOST"
	    TEST=$($IPCMD $HOST 2>/dev/null)

	    if [[ ( $? -eq 0 ) && ( -z $(echo $TEST | $GREP NXDOMAIN) ) ]] 
	    then
		[[ $DEBUG -gt 0 ]] && echo "TEST is $TEST" >> $DEBUGFILE
            	IPADDRESS=$($IPCMD $HOST 2>/dev/null | $IPMOD | cut -f$IPFIELD -d" ")
	    else
		[[ $DEBUG -gt 0 ]] && echo "TEST is $TEST" >> $DEBUGFILE
		IPADDRESS=""
	    fi

	    if [[ $IPADDRESS -eq "" ]]
	    then
		QUERY="$HOSTNAME"
		[[ $DEBUG -gt 0 ]] && echo "Skipping IP address verification" >> $DEBUGFILE
	    else
		QUERY="$HOSTNAME $IPADDRESS"	
		[[ $DEBUG -gt 0 ]] && echo "Checking both IP and name." >> $DEBUGFILE
	    fi
        fi

    if [[ $DEBUG -gt 0 ]]
    then
	echo "IPADDRESS is $IPADDRESS" >> $DEBUGFILE
	echo "HOSTNAME is $HOSTNAME" >> $DEBUGFILE
	echo "" >> $DEBUGFILE
    fi

	for NAME in `echo $QUERY`
	do
       	    [[ -z $($GREP $NAME $CFGFILE | $GREP "server") ]] && let FAULT=$FAULT+1
	done

    done

    fi
}

function ConfInList
{
    NUMSERVERS=$($GREP ^"server" $CFGFILE | wc -l)

    if [[ $DEBUG -gt 0 ]]
    then
	echo "=== CONFINLIST ===" >> $DEBUGFILE
	echo "Number of \"server\" lines in $CFGFILE is $NUMSERVERS" >> $DEBUGFILE
	echo "" >> $DEBUGFILE
    fi

    if [[ $($GREP ^"server" $CFGFILE | wc -l) -gt 0 ]]
    then

	for HOST in $(cat $CFGFILE | $GREP ^"server" | awk '{print $2}')
	do
		if [[ $DEBUG -gt 0 ]]
		then
			echo "HOST is $HOST" >> $DEBUGFILE
			echo "" >> $DEBUGFILE
		fi
		if [[ -z $(echo $HOST | $GREP [a-z,A-Z]) ]]	    
		then
			IPADDRESS="$HOST"
	    		TEST=$($IPCMD $HOST 2>/dev/null)

			if [[ ( $? -eq 0 ) && ( -z $(echo $TEST | $GREP NXDOMAIN) ) ]] 
			then
			    [[ $DEBUG -gt 0 ]] && echo "TEST is $TEST" >> $DEBUGFILE
            		    HOSTNAME=$($IPCMD $HOST 2>/dev/null | $NAMEMOD | cut -f$NAMEFIELD -d" " | cut -f1 -d.)
			else
			    [[ $DEBUG -gt 0 ]] && echo "TEST is $TEST" >> $DEBUGFILE
			    HOSTNAME=""
	    		fi

			if [[ $HOSTNAME -eq "" ]]
			then
			    QUERY="$IPADDRESS"
			    echo "Skipping hostname verification" >> $DEBUGFILE
			else
			    QUERY="$HOSTNAME $IPADDRESS"	
			    [[ $DEBUG -gt 0 ]] && echo "Checking both IP and name." >> $DEBUGFILE
			fi
		else
			HOSTNAME="$HOST"
	    		TEST=$($IPCMD $HOST 2>/dev/null)

			if [[ ( $? -eq 0 ) && ( -z $(echo $TEST | $GREP NXDOMAIN) ) ]] 
			then
			    [[ $DEBUG -gt 0 ]] && echo "TEST is $TEST" >> $DEBUGFILE
            		    HOSTNAME=$($IPCMD $HOST 2>/dev/null | $IPMOD | cut -f$IPFIELD -d" ")
			else
			    [[ $DEBUG -gt 0 ]] && echo "TEST is $TEST" >> $DEBUGFILE
			    IPADDRESS=""
	    		fi

			if [[ $IPADDRESS -eq "" ]]
			then
				QUERY="$HOSTNAME"
				echo "Skipping IP address verification" >> $DEBUGFILE
			else
				QUERY="$HOSTNAME $IPADDRESS"	
				[[ $DEBUG -gt 0 ]] && echo "Checking both IP and name." >> $DEBUGFILE
			fi
		fi

		if [[ $DEBUG -gt 0 ]]
		then
			echo "IPADDRESS is $IPADDRESS" >> $DEBUGFILE
			echo "HOSTNAME is $HOSTNAME" >> $DEBUGFILE
			echo "" >> $DEBUGFILE
		fi

		for NAME in `echo $QUERY`
		do
		    [[ -z $(echo $NTPSERVERS | $GREP $NAME) ]] && let FAULT=$FAULT+1
		done

	done
    fi
}

### FINALLY, THE MAIN ROUTINE ###

SetupEnv

    if [[ $DEBUG -gt 0 ]]
    then
	echo "=== STARTING MAIN PHASE ===" >> $DEBUGFILE
	echo "" >> $DEBUGFILE
	echo "=== NTP CONFIG FILE ===" >> $DEBUGFILE
	cat $CFGFILE | grep -v ^"\#" >> $DEBUGFILE
	echo "" >> $DEBUGFILE
	echo "" >> $DEBUGFILE
    fi

ListInConf
ConfInList

# Nothing caused us to exit early, so we're okay.
if [[ $FAULT -gt 0 ]]
then
    echo "$STATE_NOK"
    exit $STATE_NOK
else
    echo "$STATE_OK"
    exit $STATE_OK
fi

kilala.nl tags: unix, sysadmin, programming,

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All content, with exception of "borrowed" blogpost images, or unless otherwise indicated, is copyright of Tess Sluijter. The character Kilala the cat-demon is copyright of Rumiko Takahashi and used here without permission.

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Tivoli script: check_ntpconfig.sh