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1#!/usr/bin/perl -w
2#
3# $Id: check_log2.pl 1300 2005-12-16 18:41:45Z harpermann $
4#
5# Log file regular expression detector for Nagios.
6# Written by Aaron Bostick (abostick@mydoconline.com)
7# Last modified: 05-02-2002
8#
9# Thanks and acknowledgements to Ethan Galstad for Nagios and the check_log
10# plugin this is modeled after.
11#
12# Usage: check_log2 -l <log_file> -s <seek_file> -p <pattern> [-n <negpattern>]
13#
14# Description:
15#
16# This plugin will scan arbitrary text files looking for regular expression
17# matches. The text file to scan is specified with <log_file>.
18# <log_seek_file> is a temporary file used to store the seek byte position
19# of the last scan. This file will be created automatically on the first
20# scan. <pattern> can be any RE pattern that perl's s/// syntax accepte. Be
21# forewarned that a bad pattern will send this script into never never land!
22#
23# Output:
24#
25# This plugin returns OK when a file is successfully scanned and no pattern
26# matches are found. WARNING is returned when 1 or more patterns are found
27# along with the pattern count and the line of the last pattern matched.
28# CRITICAL is returned when an error occurs, such as file not found, etc.
29#
30# Notes (paraphrased from check_log's notes):
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 <log_Seek_file> 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 error notices in messages
50# check_log2 -l /var/log/messages -s ./check_log2.messages.seek -p 'err'
51#
52
53
54BEGIN {
55 if ($0 =~ s/^(.*?)[\/\\]([^\/\\]+)$//) {
56 $prog_dir = $1;
57 $prog_name = $2;
58 }
59}
60
61require 5.004;
62
63use lib $main::prog_dir;
64use utils qw($TIMEOUT %ERRORS &print_revision &support &usage);
65use Getopt::Long;
66my ($dev,$ino,$mode,$nlink,$uid,$gid,$rdev,$size,$atime,$mtime,$ctime,$blksize,$blocks);
67
68sub print_usage ();
69sub print_version ();
70sub print_help ();
71
72 # Initialize strings
73 $log_file = '';
74 $seek_file = '';
75 $critical = '';
76 $re_pattern = '';
77 $neg_re_pattern = '';
78 $pattern_count = 0;
79 $pattern_line = '';
80 $plugin_revision = '$Revision: 1300 $ ';
81
82 # Grab options from command line
83 GetOptions
84 ("l|logfile=s" => \$log_file,
85 "s|seekfile=s" => \$seek_file,
86 "c|critical" => \$critical,
87 "p|pattern=s" => \$re_pattern,
88 "n|negpattern:s" => \$neg_re_pattern,
89 "v|version" => \$version,
90 "h|help" => \$help);
91
92 !($version) || print_version ();
93 !($help) || print_help ();
94
95 # Make sure log file is specified
96 ($log_file) || usage("Log file not specified.\n");
97 # Make sure seek file is specified
98 ($seek_file) || usage("Seek file not specified.\n");
99 # Make sure re pattern is specified
100 ($re_pattern) || usage("Regular expression not specified.\n");
101
102 # Open log file
103 open (LOG_FILE, $log_file) || die "Unable to open log file $log_file: $!";
104
105 # Try to open log seek file. If open fails, we seek from beginning of
106 # file by default.
107 if (open(SEEK_FILE, $seek_file)) {
108 chomp(@seek_pos = <SEEK_FILE>);
109 close(SEEK_FILE);
110
111 # If file is empty, no need to seek...
112 if ($seek_pos[0] != 0) {
113
114 # Compare seek position to actual file size.
115 # If file size is smaller
116 # then we just start from beginning i.e. file was rotated, etc.
117 ($dev,$ino,$mode,$nlink,$uid,$gid,$rdev,$size,$atime,$mtime,$ctime,$blksize,$blocks) = stat(LOG_FILE);
118
119 if ($seek_pos[0] <= $size) {
120 seek(LOG_FILE, $seek_pos[0], 0);
121 }
122 }
123 }
124
125 # Loop through every line of log file and check for pattern matches.
126 # Count the number of pattern matches and remember the full line of
127 # the most recent match.
128 while (<LOG_FILE>) {
129 if ($neg_re_pattern) {
130 if ((/$re_pattern/) && !(/$neg_re_pattern/)) {
131 $pattern_count += 1;
132 $pattern_line = $_;
133 }
134 } elsif (/$re_pattern/) {
135 $pattern_count += 1;
136 $pattern_line = $_;
137 }
138 }
139
140 # Overwrite log seek file and print the byte position we have seeked to.
141 open(SEEK_FILE, "> $seek_file") || die "Unable to open seek count file $seek_file: $!";
142 print SEEK_FILE tell(LOG_FILE);
143
144 # Close seek file.
145 close(SEEK_FILE);
146 # Close the log file.
147 close(LOG_FILE);
148
149 # Print result and return exit code.
150 if ($pattern_count) {
151 if ($critical) {
152 print "CRITICAL: ";
153 } else {
154 print "WARNING: ";
155 }
156 print "($pattern_count): $pattern_line";
157 if ($critical) {
158 exit $ERRORS{'CRITICAL'};
159 } else {
160 exit $ERRORS{'WARNING'};
161 }
162 } else {
163 print "OK - No matches found.\n";
164 exit $ERRORS{'OK'};
165 }
166
167#
168# Subroutines
169#
170
171sub print_usage () {
172 print "Usage: $prog_name -l <log_file> -s <log_seek_file> -p <pattern> [-n <negpattern>] -c | --critical\n";
173 print "Usage: $prog_name [ -v | --version ]\n";
174 print "Usage: $prog_name [ -h | --help ]\n";
175}
176
177sub print_version () {
178 print_revision($prog_name, $plugin_revision);
179 exit $ERRORS{'OK'};
180}
181
182sub print_help () {
183 print_revision($prog_name, $plugin_revision);
184 print "\n";
185 print "Scan arbitrary log files for regular expression matches.\n";
186 print "\n";
187 print_usage();
188 print "\n";
189 print "-l, --logfile=<logfile>\n";
190 print " The log file to be scanned\n";
191 print "-s, --seekfile=<seekfile>\n";
192 print " The temporary file to store the seek position of the last scan\n";
193 print "-p, --pattern=<pattern>\n";
194 print " The regular expression to scan for in the log file\n";
195 print "-n, --negpattern=<negpattern>\n";
196 print " The regular expression to skip in the log file\n";
197 print "-c, --critical\n";
198 print " Return critical instead of warning on error\n";
199 print "\n";
200 support();
201 exit $ERRORS{'OK'};
202}