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#!/bin/sh
#
# Log file pattern detector plugin for Nagios
# Written by Ethan Galstad (nagios@nagios.org)
# Last Modified: 07-31-1999
#
# Usage: ./check_log <log_file> <old_log_file> <pattern>
#
# Description:
#
# This plugin will scan a log file (specified by the <log_file> option)
# for a specific pattern (specified by the <pattern> option). Successive
# calls to the plugin script will only report *new* pattern matches in the
# log file, since an copy of the log file from the previous run is saved
# to <old_log_file>.
#
# Output:
#
# On the first run of the plugin, it will return an OK state with a message
# of "Log check data initialized". On successive runs, it will return an OK
# state if *no* pattern matches have been found in the *difference* between the
# log file and the older copy of the log file. If the plugin detects any
# pattern matches in the log diff, it will return a CRITICAL state and print
# out a message is the following format: "(x) last_match", where "x" is the
# total number of pattern matches found in the file and "last_match" is the
# last entry in the log file which matches the pattern.
#
# Notes:
#
# If you use this plugin make sure to keep the following in mind:
#
# 1. The "max_attempts" value for the service should be 1, as this
# will prevent Nagios from retrying the service check (the
# next time the check is run it will not produce the same results).
#
# 2. The "notify_recovery" value for the service should be 0, so that
# Nagios does not notify you of "recoveries" for the check. Since
# pattern matches in the log file will only be reported once and not
# the next time, there will always be "recoveries" for the service, even
# though recoveries really don't apply to this type of check.
#
# 3. You *must* supply a different <old_file_log> for each service that
# you define to use this plugin script - even if the different services
# check the same <log_file> for pattern matches. This is necessary
# because of the way the script operates.
#
# Examples:
#
# Check for login failures in the syslog...
#
# check_log /var/log/messages ./check_log.badlogins.old "LOGIN FAILURE"
#
# Check for port scan alerts generated by Psionic's PortSentry software...
#
# check_log /var/log/message ./check_log.portscan.old "attackalert"
#
# Paths to commands used in this script. These
# may have to be modified to match your system setup.
PATH=""
ECHO="/bin/echo"
GREP="/bin/egrep"
DIFF="/bin/diff"
TAIL="/bin/tail"
CAT="/bin/cat"
RM="/bin/rm"
CHMOD="/bin/chmod"
TOUCH="/bin/touch"
PROGNAME=`/bin/basename $0`
PROGPATH=`echo $0 | /bin/sed -e 's,[\\/][^\\/][^\\/]*$,,'`
REVISION=`echo '$Revision$' | /bin/sed -e 's/[^0-9.]//g'`
. $PROGPATH/utils.sh
print_usage() {
echo "Usage: $PROGNAME -F logfile -O oldlog -q query"
echo "Usage: $PROGNAME --help"
echo "Usage: $PROGNAME --version"
}
print_help() {
print_revision $PROGNAME $REVISION
echo ""
print_usage
echo ""
echo "Log file pattern detector plugin for Nagios"
echo ""
support
}
# Make sure the correct number of command line
# arguments have been supplied
if [ $# -lt 1 ]; then
print_usage
exit $STATE_UNKNOWN
fi
# Grab the command line arguments
#logfile=$1
#oldlog=$2
#query=$3
exitstatus=$STATE_WARNING #default
while test -n "$1"; do
case "$1" in
--help)
print_help
exit $STATE_OK
;;
-h)
print_help
exit $STATE_OK
;;
--version)
print_revision $PROGNAME $VERSION
exit $STATE_OK
;;
-V)
print_revision $PROGNAME $VERSION
exit $STATE_OK
;;
--filename)
logfile=$2
shift
;;
-F)
logfile=$2
shift
;;
--oldlog)
oldlog=$2
shift
;;
-O)
oldlog=$2
shift
;;
--query)
query=$2
shift
;;
-q)
query=$2
shift
;;
-x)
exitstatus=$2
shift
;;
--exitstatus)
exitstatus=$2
shift
;;
*)
echo "Unknown argument: $1"
print_usage
exit $STATE_UNKNOWN
;;
esac
shift
done
# If the source log file doesn't exist, exit
if [ ! -e $logfile ]; then
$ECHO "Log check error: Log file $logfile does not exist!\n"
exit $STATE_UNKNOWN
elif [ ! -r $logfile ] ; then
$ECHO "Log check error: Log file $logfile is not readable!\n"
exit $STATE_UNKNOWN
fi
# If the old log file doesn't exist, this must be the first time
# we're running this test, so copy the original log file over to
# the old diff file and exit
if [ ! -e $oldlog ]; then
$CAT $logfile > $oldlog
$ECHO "Log check data initialized...\n"
exit $STATE_OK
fi
# The old log file exists, so compare it to the original log now
# The temporary file that the script should use while
# processing the log file.
if [ -x /bin/mktemp ]; then
tempdiff=`/bin/mktemp /tmp/check_log.XXXXXXXXXX`
else
tempdiff=`/bin/date '+%H%M%S'`
tempdiff="/tmp/check_log.${tempdiff}"
$TOUCH $tempdiff
$CHMOD 600 $tempdiff
fi
$DIFF $logfile $oldlog > $tempdiff
# Count the number of matching log entries we have
count=`$GREP -c "$query" $tempdiff`
# Get the last matching entry in the diff file
lastentry=`$GREP "$query" $tempdiff | $TAIL -1`
$RM -f $tempdiff
$CAT $logfile > $oldlog
if [ "$count" = "0" ]; then # no matches, exit with no error
$ECHO "Log check ok - 0 pattern matches found\n"
exitstatus=$STATE_OK
else # Print total matche count and the last entry we found
$ECHO "($count) $lastentry"
exitstatus=$STATE_CRITICAL
fi
exit $exitstatus
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