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-#! /bin/bash
-#
-# 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.
-# TV: removed PATH restriction. Need to think more about what this means overall
-#PATH=""
-
-ECHO="/bin/echo"
-GREP="/bin/egrep"
-DIFF="/usr/bin/diff"
-TAIL="/usr/bin/tail"
-CAT="/bin/cat"
-RM="/bin/rm"
-CHMOD="/bin/chmod"
-TOUCH="/bin/touch"
-
-PROGNAME=`/usr/bin/basename $0`
-PROGPATH=`echo $0 | sed -e 's,[\\/][^\\/][^\\/]*$,,'`
-REVISION="1.4.15"
-
-. $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 $REVISION
- exit $STATE_OK
- ;;
- -V)
- print_revision $PROGNAME $REVISION
- 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 | $GREP -v "^>" > $tempdiff
-
-# Count the number of matching log entries we have
-count=`$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