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#!/usr/bin/perl -w
# check_ro_mounts.pl Copyright (c) 2008 Valentin Vidic <vvidic@carnet.hr>
#
# Checks the mount table for read-only mounts - these are usually a sign of
# trouble (broken filesystem etc.)
#
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty
# of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# you should have received a copy of the GNU General Public License
# along with this program (or with Nagios); if not, write to the
# Free Software Foundation, Inc., 59 Temple Place - Suite 330,
# Boston, MA 02111-1307, USA
use strict;
use Getopt::Long;
use lib "/usr/local/nagios/libexec";
use lib $ENV{"HOME"} . "/bin";
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use utils qw (%ERRORS &support);
my $name = 'RO_MOUNTS';
my $mtab = '/proc/mounts';
my @includes = ();
my @excludes = ();
my @excluded_types = ();
my @ro_mounts = ();
my $want_help = 0;
Getopt::Long::Configure(qw(no_ignore_case));
my $res = GetOptions(
"help|h" => \$want_help,
"mtab|m=s" => \$mtab,
"path|p=s" => \@includes,
"partition=s" => \@includes,
"exclude|x=s" => \@excludes,
"exclude-type|X=s" => \@excluded_types,
);
if ($want_help or !$res) {
print_help();
exit $ERRORS{$res ? 'OK' : 'UNKNOWN'};
}
my $includes_re = globs2re(@includes);
my $excludes_re = globs2re(@excludes);
my $excluded_types_re = globs2re(@excluded_types);
open(MTAB, $mtab) or nagios_exit(UNKNOWN => "Can't open $mtab: $!");
MOUNT: while (<MTAB>) {
# parse mtab lines
my ($dev, $dir, $fs, $opt) = split;
my @opts = split(',', $opt);
# check includes/excludes
if ($includes_re) {
next MOUNT unless $dev =~ qr/$includes_re/
or $dir =~ qr/$includes_re/;
}
if ($excludes_re) {
next MOUNT if $dev =~ qr/$excludes_re/
or $dir =~ qr/$excludes_re/;
}
if ($excluded_types_re) {
next MOUNT if $fs =~ qr/$excluded_types_re/;
}
# check for ro option
if (grep /^ro$/, @opts) {
push @ro_mounts, $dir;
}
}
nagios_exit(UNKNOWN => "Read failed on $mtab: $!") if $!;
close(MTAB) or nagios_exit(UNKNOWN => "Can't close $mtab: $!");
# report findings
if (@ro_mounts) {
nagios_exit(CRITICAL => "Found ro mounts: @ro_mounts");
} else {
nagios_exit(OK => "No ro mounts found");
}
# convert glob patterns to a RE (undef if no patterns)
sub globs2re {
my(@patterns) = @_;
@patterns or return undef;
foreach (@patterns) {
s/ \\(.) / sprintf('\x%02X', ord($1)) /egx;
s/ ([^\\*?\w]) / sprintf('\x%02X', ord($1)) /egx;
s/\*/.*/g;
s/\?/./g;
}
return '\A(?:' . join('|', @patterns) . ')\z';
}
# output the result and exit plugin style
sub nagios_exit {
my ($result, $msg) = @_;
print "$name $result: $msg\n";
exit $ERRORS{$result};
}
sub print_help {
print <<EOH;
check_ro_mounts 0.1
Copyright (c) 2008 Valentin Vidic <vvidic\@carnet.hr>
This plugin checks the mount table for read-only mounts.
Usage:
check_ro_mounts [-m mtab] [-p path] [-x path] [-X type]
Options:
-h, --help
Print detailed help screen
-m, --mtab=FILE
Use this mtab instead (default is /proc/mounts)
-p, --path=PATH, --partition=PARTITION
Glob pattern of path or partition to check (may be repeated)
-x, --exclude=PATH <STRING>
Glob pattern of path or partition to ignore (only works if -p unspecified)
-X, --exclude-type=TYPE <STRING>
Ignore all filesystems of indicated type (may be repeated)
EOH
support();
}
# vim:sw=4:ts=4:et