203 lines
6.5 KiB
Perl
203 lines
6.5 KiB
Perl
#!/usr/bin/perl -w
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#
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# $Id: check_log2.pl 1300 2005-12-16 18:41:45Z harpermann $
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#
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# Log file regular expression detector for Nagios.
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# Written by Aaron Bostick (abostick@mydoconline.com)
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# Last modified: 05-02-2002
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#
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# Thanks and acknowledgements to Ethan Galstad for Nagios and the check_log
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# plugin this is modeled after.
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#
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# Usage: check_log2 -l <log_file> -s <seek_file> -p <pattern> [-n <negpattern>]
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#
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# Description:
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#
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# This plugin will scan arbitrary text files looking for regular expression
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# matches. The text file to scan is specified with <log_file>.
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# <log_seek_file> is a temporary file used to store the seek byte position
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# of the last scan. This file will be created automatically on the first
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# scan. <pattern> can be any RE pattern that perl's s/// syntax accepte. Be
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# forewarned that a bad pattern will send this script into never never land!
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#
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# Output:
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#
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# This plugin returns OK when a file is successfully scanned and no pattern
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# matches are found. WARNING is returned when 1 or more patterns are found
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# along with the pattern count and the line of the last pattern matched.
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# CRITICAL is returned when an error occurs, such as file not found, etc.
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#
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# Notes (paraphrased from check_log's notes):
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#
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# 1. The "max_attempts" value for the service should be 1, as this
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# will prevent Nagios 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
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# Nagios does not notify you of "recoveries" for the check. Since
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# pattern matches in the log file will only be reported once and not
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# the next time, there will always be "recoveries" for the service, even
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# 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 <log_Seek_file> 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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# Examples:
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#
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# Check for error notices in messages
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# check_log2 -l /var/log/messages -s ./check_log2.messages.seek -p 'err'
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#
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BEGIN {
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if ($0 =~ s/^(.*?)[\/\\]([^\/\\]+)$//) {
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$prog_dir = $1;
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$prog_name = $2;
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}
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}
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require 5.004;
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use lib $main::prog_dir;
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use utils qw($TIMEOUT %ERRORS &print_revision &support &usage);
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use Getopt::Long;
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my ($dev,$ino,$mode,$nlink,$uid,$gid,$rdev,$size,$atime,$mtime,$ctime,$blksize,$blocks);
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sub print_usage ();
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sub print_version ();
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sub print_help ();
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# Initialize strings
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$log_file = '';
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$seek_file = '';
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$critical = '';
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$re_pattern = '';
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$neg_re_pattern = '';
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$pattern_count = 0;
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$pattern_line = '';
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$plugin_revision = '$Revision: 1300 $ ';
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# Grab options from command line
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GetOptions
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("l|logfile=s" => \$log_file,
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"s|seekfile=s" => \$seek_file,
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"c|critical" => \$critical,
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"p|pattern=s" => \$re_pattern,
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"n|negpattern:s" => \$neg_re_pattern,
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"v|version" => \$version,
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"h|help" => \$help);
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!($version) || print_version ();
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!($help) || print_help ();
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# Make sure log file is specified
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($log_file) || usage("Log file not specified.\n");
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# Make sure seek file is specified
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($seek_file) || usage("Seek file not specified.\n");
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# Make sure re pattern is specified
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($re_pattern) || usage("Regular expression not specified.\n");
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# Open log file
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open (LOG_FILE, $log_file) || die "Unable to open log file $log_file: $!";
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# Try to open log seek file. If open fails, we seek from beginning of
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# file by default.
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if (open(SEEK_FILE, $seek_file)) {
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chomp(@seek_pos = <SEEK_FILE>);
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close(SEEK_FILE);
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# If file is empty, no need to seek...
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if ($seek_pos[0] != 0) {
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# Compare seek position to actual file size.
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# If file size is smaller
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# then we just start from beginning i.e. file was rotated, etc.
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($dev,$ino,$mode,$nlink,$uid,$gid,$rdev,$size,$atime,$mtime,$ctime,$blksize,$blocks) = stat(LOG_FILE);
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if ($seek_pos[0] <= $size) {
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seek(LOG_FILE, $seek_pos[0], 0);
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}
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}
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}
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# Loop through every line of log file and check for pattern matches.
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# Count the number of pattern matches and remember the full line of
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# the most recent match.
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while (<LOG_FILE>) {
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if ($neg_re_pattern) {
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if ((/$re_pattern/) && !(/$neg_re_pattern/)) {
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$pattern_count += 1;
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$pattern_line = $_;
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}
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} elsif (/$re_pattern/) {
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$pattern_count += 1;
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$pattern_line = $_;
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}
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}
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# Overwrite log seek file and print the byte position we have seeked to.
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open(SEEK_FILE, "> $seek_file") || die "Unable to open seek count file $seek_file: $!";
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print SEEK_FILE tell(LOG_FILE);
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# Close seek file.
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close(SEEK_FILE);
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# Close the log file.
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close(LOG_FILE);
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# Print result and return exit code.
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if ($pattern_count) {
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if ($critical) {
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print "CRITICAL: ";
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} else {
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print "WARNING: ";
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}
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print "($pattern_count): $pattern_line";
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if ($critical) {
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exit $ERRORS{'CRITICAL'};
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} else {
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exit $ERRORS{'WARNING'};
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}
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} else {
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print "OK - No matches found.\n";
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exit $ERRORS{'OK'};
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}
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#
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# Subroutines
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#
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sub print_usage () {
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print "Usage: $prog_name -l <log_file> -s <log_seek_file> -p <pattern> [-n <negpattern>] -c | --critical\n";
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print "Usage: $prog_name [ -v | --version ]\n";
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print "Usage: $prog_name [ -h | --help ]\n";
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}
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sub print_version () {
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print_revision($prog_name, $plugin_revision);
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exit $ERRORS{'OK'};
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}
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sub print_help () {
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print_revision($prog_name, $plugin_revision);
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print "\n";
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print "Scan arbitrary log files for regular expression matches.\n";
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print "\n";
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print_usage();
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print "\n";
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print "-l, --logfile=<logfile>\n";
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print " The log file to be scanned\n";
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print "-s, --seekfile=<seekfile>\n";
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print " The temporary file to store the seek position of the last scan\n";
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print "-p, --pattern=<pattern>\n";
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print " The regular expression to scan for in the log file\n";
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print "-n, --negpattern=<negpattern>\n";
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print " The regular expression to skip in the log file\n";
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print "-c, --critical\n";
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print " Return critical instead of warning on error\n";
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print "\n";
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support();
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exit $ERRORS{'OK'};
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}
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