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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/grep"
+DIFF="/usr/bin/diff"
+TAIL="/usr/bin/tail"
+CAT="/bin/cat"
+RM="/bin/rm"
+
+PROGNAME=`/bin/basename $0`
+PROGPATH=`echo $0 | /bin/sed -e 's,[\\/][^\\/][^\\/]*$,,'`
+REVISION=`echo '$Revision: 1.4 $' | /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}"
+    /bin/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 | $TAIL --lines=1`
+
+$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