check_linux_raid

#!/usr/bin/perl
# nagios: -epn

# Copyright (c) 2002 ISOMEDIA, Inc.
# originally written by Steve Milton
# later updates by sean finney <seanius@seanius.net>
#
# 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; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
#
# Usage:   check_raid [raid-name]
# Example: check_raid md0
#     WARNING md0 status=[UUU_U], recovery=46.4%, finish=123.0min

use strict;
use lib "/usr/lib/nagios/plugins";
use utils qw(%ERRORS);

# die with an error if we're not on Linux
if ($^O ne 'linux') {
    print "This plugin only applicable on Linux.\n";
    exit $ERRORS{'UNKNOWN'};
}

sub max_state($$){
    my ($a, $b) = @_;
    if ($a eq "CRITICAL" || $b eq "CRITICAL") { return "CRITICAL"; }
    elsif ($a eq "WARNING" || $b eq "WARNING") { return "WARNING"; }
    elsif ($a eq "OK" || $b eq "OK") { return "OK"; }
    elsif ($a eq "UNKNOWN" || $b eq "UNKNOWN") { return "UNKNOWN"; }
    elsif ($a eq "DEPENDENT" || $b eq "DEPENDENT") { return "DEPENDENT"; }
    return "UNKNOWN";
}

my $nextdev;
if(defined $ARGV[0]) { $nextdev = shift; }
else { $nextdev = "md[0-9]+"; }

my $code = "UNKNOWN";
my $msg = "";
my %status;
my %recovery;
my %finish;
my %active;
my %devices;

while(defined $nextdev){
    open (MDSTAT, "< /proc/mdstat") or die "Failed to open /proc/mdstat";
    my $device = undef;
    while(<MDSTAT>) {
        if (defined $device) {
            if (/(\[[_U]+\])/) {
                $status{$device} = $1;
            } elsif (/recovery = (.*?)\s/) {
                $recovery{$device} = $1;
                ($finish{$device}) = /finish=(.*?min)/;
            } elsif (/^\s*$/) {
                $device=undef;
            }
        } elsif (/^($nextdev)\s*:/) {
            $device=$1;
            $devices{$device}=$device;
            if (/active/) {
                $active{$device} = 1;
            }
        }
    }
    $nextdev = shift;
}

foreach my $k (sort keys %devices){
        next unless (defined($status{$k}));
    if ($status{$k} =~ /_/) {
        if (defined $recovery{$k}) {
            $msg .= sprintf " %s status=%s, recovery=%s, finish=%s.",
                $devices{$k}, $status{$k}, $recovery{$k}, $finish{$k};
            $code = max_state($code, "WARNING");
        } else {
            $msg .= sprintf " %s status=%s.", $devices{$k}, $status{$k};
            $code = max_state($code, "CRITICAL");
        }
    } elsif ($status{$k} =~ /U+/) {
        $msg .= sprintf " %s status=%s.", $devices{$k}, $status{$k};
        $code = max_state($code, "OK");
    } else {
        if ($active{$k}) {
            $msg .= sprintf " %s active with no status information.\n",
                $devices{$k};
            $code = max_state($code, "OK");
        } else {
            $msg .= sprintf " %s does not exist.\n", $devices{$k};
            $code = max_state($code, "CRITICAL");
        }
    }
}

print $code, $msg, "\n";
exit ($ERRORS{$code});