245 lines
7 KiB
Bash
Executable file
245 lines
7 KiB
Bash
Executable file
#!/bin/sh
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#
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# Log file pattern detector plugin for monitoring
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# Written originally by Ethan Galstad (nagios@nagios.org)
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#
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# Usage: ./check_log <log_file> <old_log_file> <pattern>
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#
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# Description:
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#
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# This plugin will scan a log file (specified by the <log_file> option)
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# for a specific pattern (specified by the <pattern> option). Successive
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# calls to the plugin script will only report *new* pattern matches in the
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# log file, since an copy of the log file from the previous run is saved
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# to <old_log_file>.
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#
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# Output:
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#
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# On the first run of the plugin, it will return an OK state with a message
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# of "Log check data initialized". On successive runs, it will return an OK
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# state if *no* pattern matches have been found in the *difference* between the
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# log file and the older copy of the log file. If the plugin detects any
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# pattern matches in the log diff, it will return a CRITICAL state and print
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# out a message is the following format: "(x) last_match", where "x" is the
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# total number of pattern matches found in the file and "last_match" is the
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# last entry in the log file which matches the pattern.
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#
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# Notes:
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#
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# If you use this plugin make sure to keep the following in mind:
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#
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# 1. The "max_attempts" value for the service should be 1, as this will
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# prevent the monitoring system from retrying the service check (the
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# next time the check is run it will not produce the same results).
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#
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# 2. The "notify_recovery" value for the service should be 0, so that the
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# monitoring system does not notify you of "recoveries" for the check.
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# Since pattern matches in the log file will only be reported once and
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# not the next time, there will always be "recoveries" for the service,
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# even though recoveries really don't apply to this type of check.
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#
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# 3. You *must* supply a different <old_file_log> for each service that
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# you define to use this plugin script - even if the different services
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# check the same <log_file> for pattern matches. This is necessary
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# because of the way the script operates.
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#
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# 4. This plugin does NOT have an understanding of logrotation or similar
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# mechanisms. Therefore bad timing could lead to missing events
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#
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#
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# Examples:
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#
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# Check for login failures in the syslog...
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#
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# check_log /var/log/messages ./check_log.badlogins.old "LOGIN FAILURE"
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#
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# Check for port scan alerts generated by Psionic's PortSentry software...
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#
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# check_log /var/log/message ./check_log.portscan.old "attackalert"
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#
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# Paths to commands used in this script. These
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# may have to be modified to match your system setup.
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PATH="@TRUSTED_PATH@"
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export PATH
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PROGNAME=$(basename "$0")
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PROGPATH=$(echo "$0" | sed -e 's,[\\/][^\\/][^\\/]*$,,')
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REVISION="@NP_VERSION@"
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. "$PROGPATH"/utils.sh
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print_usage() {
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echo "Usage: $PROGNAME -F logfile -O oldlog -q query"
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echo "Usage: $PROGNAME --help"
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echo "Usage: $PROGNAME --version"
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echo ""
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echo "Other parameters:"
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echo " -a|--all : Print all matching lines"
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echo " --exclude: Exclude a pattern (-p or -e also applies here when used)"
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echo " -p|--perl-regex : Use perl style regular expressions in the query"
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echo " -e|--extended-regex : Use extended style regular expressions in the query (not necessary for GNU grep)"
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}
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print_help() {
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print_revision "$PROGNAME" "$REVISION"
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echo ""
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print_usage
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echo ""
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echo "Log file pattern detector plugin for monitoring"
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echo ""
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support
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}
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# Make sure the correct number of command line
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# arguments have been supplied
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if [ $# -lt 1 ]; then
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print_usage
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exit "$STATE_UNKNOWN"
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fi
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# Grab the command line arguments
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exitstatus=$STATE_WARNING #default
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while test -n "$1"; do
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case "$1" in
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-h | --help)
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print_help
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exit "$STATE_UNKNOWN"
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;;
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-V | --version)
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print_revision "$PROGNAME" "$REVISION"
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exit "$STATE_UNKNOWN"
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;;
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-F | --filename)
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logfile=$2
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shift 2
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;;
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-O | --oldlog)
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oldlog=$2
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shift 2
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;;
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-q | --query)
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query=$2
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shift 2
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;;
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--exclude)
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exclude=$2
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shift 2
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;;
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-x | --exitstatus)
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exitstatus=$2
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shift 2
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;;
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-e | --extended-regex)
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ERE=1
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shift
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;;
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-p | --perl-regex)
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PRE=1
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shift
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;;
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-a | --all)
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ALL=1
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shift
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;;
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*)
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echo "Unknown argument: $1"
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print_usage
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exit "$STATE_UNKNOWN"
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;;
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esac
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done
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# Parameter sanity check
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if [ $ERE ] && [ $PRE ] ; then
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echo "Can not use extended and perl regex at the same time"
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exit "$STATE_UNKNOWN"
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fi
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GREP="grep"
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if [ $ERE ]; then
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GREP="grep -E"
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fi
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if [ $PRE ]; then
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GREP="grep -P"
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fi
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# If the source log file doesn't exist, exit
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if [ ! -e "$logfile" ]; then
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echo "Log check error: Log file $logfile does not exist!"
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exit "$STATE_UNKNOWN"
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elif [ ! -r "$logfile" ] ; then
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echo "Log check error: Log file $logfile is not readable!"
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exit "$STATE_UNKNOWN"
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fi
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# If no oldlog was given this can not work properly, abort then
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if [ -z "$oldlog" ]; then
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echo "Oldlog parameter is needed"
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exit $STATE_UNKNOWN
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fi
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# If the old log file doesn't exist, this must be the first time
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# we're running this test, so copy the original log file over to
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# the old diff file and exit
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if [ ! -e "$oldlog" ]; then
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cat "$logfile" > "$oldlog"
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echo "Log check data initialized..."
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exit "$STATE_OK"
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fi
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# The old log file exists, so compare it to the original log now
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# The temporary file that the script should use while
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# processing the log file.
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if [ -x /bin/mktemp ]; then
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tempdiff=$(/bin/mktemp /tmp/check_log.XXXXXXXXXX)
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else
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tempdiff=$(/bin/date '+%H%M%S')
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tempdiff="/tmp/check_log.${tempdiff}"
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touch "$tempdiff"
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chmod 600 "$tempdiff"
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fi
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diff "$logfile" "$oldlog" | grep -v "^>" > "$tempdiff"
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if [ $ALL ]; then
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# Get all matching entries in the diff file
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if [ -n "$exclude" ]; then
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entry=$($GREP "$query" "$tempdiff" | $GREP -v "$exclude")
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count=$($GREP "$query" "$tempdiff" | $GREP -vc "$exclude")
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else
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entry=$($GREP "$query" "$tempdiff")
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count=$($GREP -c "$query" "$tempdiff")
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fi
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else
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# Get the last matching entry in the diff file
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if [ -n "$exclude" ]; then
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entry=$($GREP "$query" "$tempdiff" | $GREP -v "$exclude" | tail -1)
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count=$($GREP "$query" "$tempdiff" | $GREP -vc "$exclude")
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else
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entry=$($GREP "$query" "$tempdiff" | tail -1)
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count=$($GREP -c "$query" "$tempdiff")
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fi
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fi
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rm -f "$tempdiff"
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cat "$logfile" > "$oldlog"
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if [ "$count" = "0" ]; then # no matches, exit with no error
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echo "Log check ok - 0 pattern matches found"
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exitstatus=$STATE_OK
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else # Print total match count and the last entry we found
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echo "($count) $entry"
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exitstatus=$STATE_CRITICAL
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fi
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exit "$exitstatus"
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