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Diffstat (limited to 'plugins-scripts/check_log.sh')
| -rwxr-xr-x | plugins-scripts/check_log.sh | 214 |
1 files changed, 214 insertions, 0 deletions
diff --git a/plugins-scripts/check_log.sh b/plugins-scripts/check_log.sh new file mode 100755 index 00000000..08e7fef6 --- /dev/null +++ b/plugins-scripts/check_log.sh @@ -0,0 +1,214 @@ +#! /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="/bin/diff" +TAIL="/bin/tail" +CAT="/bin/cat" +RM="/bin/rm" + +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 2 +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 0 +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="/tmp/check_log.`/bin/date '+%H%M%S'`" + /bin/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 | $TAIL --lines=1` + +$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=0 +else # Print total matche count and the last entry we found + $ECHO "($count) $lastentry" +fi + +exit exitstatus + + |