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1#! /bin/sh
2#
3# Log file pattern detector plugin for Nagios
4# Written by Ethan Galstad (nagios@nagios.org)
5# Last Modified: 07-31-1999
6#
7# Usage: ./check_log <log_file> <old_log_file> <pattern>
8#
9# Description:
10#
11# This plugin will scan a log file (specified by the <log_file> option)
12# for a specific pattern (specified by the <pattern> option). Successive
13# calls to the plugin script will only report *new* pattern matches in the
14# log file, since an copy of the log file from the previous run is saved
15# to <old_log_file>.
16#
17# Output:
18#
19# On the first run of the plugin, it will return an OK state with a message
20# of "Log check data initialized". On successive runs, it will return an OK
21# state if *no* pattern matches have been found in the *difference* between the
22# log file and the older copy of the log file. If the plugin detects any
23# pattern matches in the log diff, it will return a CRITICAL state and print
24# out a message is the following format: "(x) last_match", where "x" is the
25# total number of pattern matches found in the file and "last_match" is the
26# last entry in the log file which matches the pattern.
27#
28# Notes:
29#
30# If you use this plugin make sure to keep the following in mind:
31#
32# 1. The "max_attempts" value for the service should be 1, as this
33# will prevent Nagios from retrying the service check (the
34# next time the check is run it will not produce the same results).
35#
36# 2. The "notify_recovery" value for the service should be 0, so that
37# Nagios does not notify you of "recoveries" for the check. Since
38# pattern matches in the log file will only be reported once and not
39# the next time, there will always be "recoveries" for the service, even
40# though recoveries really don't apply to this type of check.
41#
42# 3. You *must* supply a different <old_file_log> for each service that
43# you define to use this plugin script - even if the different services
44# check the same <log_file> for pattern matches. This is necessary
45# because of the way the script operates.
46#
47# Examples:
48#
49# Check for login failures in the syslog...
50#
51# check_log /var/log/messages ./check_log.badlogins.old "LOGIN FAILURE"
52#
53# Check for port scan alerts generated by Psionic's PortSentry software...
54#
55# check_log /var/log/message ./check_log.portscan.old "attackalert"
56#
57
58# Paths to commands used in this script. These
59# may have to be modified to match your system setup.
60
61PATH=""
62
63ECHO="/bin/echo"
64GREP="/bin/grep"
65DIFF="/bin/diff"
66TAIL="/bin/tail"
67CAT="/bin/cat"
68RM="/bin/rm"
69
70PROGNAME=`/bin/basename $0`
71PROGPATH=`echo $0 | /bin/sed -e 's,[\\/][^\\/][^\\/]*$,,'`
72REVISION=`echo '$Revision$' | /bin/sed -e 's/[^0-9.]//g'`
73
74. $PROGPATH/utils.sh
75
76print_usage() {
77 echo "Usage: $PROGNAME -F logfile -O oldlog -q query"
78 echo "Usage: $PROGNAME --help"
79 echo "Usage: $PROGNAME --version"
80}
81
82print_help() {
83 print_revision $PROGNAME $REVISION
84 echo ""
85 print_usage
86 echo ""
87 echo "Log file pattern detector plugin for Nagios"
88 echo ""
89 support
90}
91
92# Make sure the correct number of command line
93# arguments have been supplied
94
95if [ $# -lt 1 ]; then
96 print_usage
97 exit $STATE_UNKNOWN
98fi
99
100# Grab the command line arguments
101
102#logfile=$1
103#oldlog=$2
104#query=$3
105exitstatus=$STATE_WARNING #default
106while test -n "$1"; do
107 case "$1" in
108 --help)
109 print_help
110 exit $STATE_OK
111 ;;
112 -h)
113 print_help
114 exit $STATE_OK
115 ;;
116 --version)
117 print_revision $PROGNAME $VERSION
118 exit $STATE_OK
119 ;;
120 -V)
121 print_revision $PROGNAME $VERSION
122 exit $STATE_OK
123 ;;
124 --filename)
125 logfile=$2
126 shift
127 ;;
128 -F)
129 logfile=$2
130 shift
131 ;;
132 --oldlog)
133 oldlog=$2
134 shift
135 ;;
136 -O)
137 oldlog=$2
138 shift
139 ;;
140 --query)
141 query=$2
142 shift
143 ;;
144 -q)
145 query=$2
146 shift
147 ;;
148 -x)
149 exitstatus=$2
150 shift
151 ;;
152 --exitstatus)
153 exitstatus=$2
154 shift
155 ;;
156 *)
157 echo "Unknown argument: $1"
158 print_usage
159 exit $STATE_UNKNOWN
160 ;;
161 esac
162 shift
163done
164
165# If the source log file doesn't exist, exit
166
167if [ ! -e $logfile ]; then
168 $ECHO "Log check error: Log file $logfile does not exist!\n"
169 exit 2
170fi
171
172# If the old log file doesn't exist, this must be the first time
173# we're running this test, so copy the original log file over to
174# the old diff file and exit
175
176if [ ! -e $oldlog ]; then
177 $CAT $logfile > $oldlog
178 $ECHO "Log check data initialized...\n"
179 exit 0
180fi
181
182# The old log file exists, so compare it to the original log now
183
184# The temporary file that the script should use while
185# processing the log file.
186if [-x /bin/mktemp]; then
187 tempdiff="/bin/mktemp /tmp/check_log.XXXXXXXXXX"
188else
189 tempdiff="/tmp/check_log.`/bin/date '+%H%M%S'`"
190 /bin/touch $tempdiff
191 chmod 600 $tempdiff
192fi
193
194$DIFF $logfile $oldlog > $tempdiff
195
196# Count the number of matching log entries we have
197count=`$GREP -c "$query" $tempdiff`
198
199# Get the last matching entry in the diff file
200lastentry=`$GREP "$query" $tempdiff | $TAIL --lines=1`
201
202$RM -f $tempdiff
203$CAT $logfile > $oldlog
204
205if [ "$count" = "0" ]; then # no matches, exit with no error
206 $ECHO "Log check ok - 0 pattern matches found\n"
207 exitstatus=0
208else # Print total matche count and the last entry we found
209 $ECHO "($count) $lastentry"
210fi
211
212exit exitstatus
213
214