#! /usr/bin/perl -w
################################################################################
# Copyright 2004-2011 MERETHIS
# Centreon is developped by : Julien Mathis and Romain Le Merlus under
# GPL Licence 2.0.
# 
# 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.
# 
# 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, see <http://www.gnu.org/licenses>.
# 
# Linking this program statically or dynamically with other modules is making a 
# combined work based on this program. Thus, the terms and conditions of the GNU 
# General Public License cover the whole combination.
# 
# As a special exception, the copyright holders of this program give MERETHIS 
# permission to link this program with independent modules to produce an executable, 
# regardless of the license terms of these independent modules, and to copy and 
# distribute the resulting executable under terms of MERETHIS choice, provided that 
# MERETHIS also meet, for each linked independent module, the terms  and conditions 
# of the license of that module. An independent module is a module which is not 
# derived from this program. If you modify this program, you may extend this 
# exception to your version of the program, but you are not obliged to do so. If you
# do not wish to do so, delete this exception statement from your version.
# 
# For more information : contact@centreon.com
# 
# SVN : $URL: http://svn.centreon.com/trunk/plugins-2.x/src/check_centreon_snmp_remote_storage $
# SVN : $Id: check_centreon_snmp_remote_storage 12719 2011-11-17 10:39:40Z mbersoult $
#
#####################################################################################
#
# Script init
#

use strict;
use Net::SNMP qw(:snmp);
use FindBin;
use lib "$FindBin::Bin";
use lib "/usr/lib/nagios/plugins";
use utils qw($TIMEOUT %ERRORS &print_revision &support);

if (eval "require centreon" ) {
    use centreon qw(get_parameters);
    use vars qw(%centreon);
    %centreon = get_parameters();
} else {
	print "Unable to load centreon perl module\n";
    exit $ERRORS{'UNKNOWN'};
}
use vars qw($PROGNAME);
use Getopt::Long;
use vars qw($opt_V $opt_t $opt_P $opt_h $opt_v $opt_f $opt_C $opt_d $opt_k $opt_u $opt_p $opt_n $opt_w $opt_c $opt_H $opt_s $opt_L $opt_M $opt_a @test);

# Plugin var init

my ($hrStorageDescr, $hrStorageAllocationUnits, $hrStorageSize, $hrStorageUsed, $hrStorageLabel);
my ($AllocationUnits, $Size, $Used);
my ($tot, $used, $pourcent, $return_code);

$PROGNAME = "$0";
sub print_help ();
sub print_usage ();

Getopt::Long::Configure('bundling');
GetOptions
    ("h"   => \$opt_h, "help"         => \$opt_h,
     "u=s" => \$opt_u, "username=s"   => \$opt_u,
     "p=s" => \$opt_p, "password=s"   => \$opt_p,
     "k=s" => \$opt_k, "key=s"        => \$opt_k,
     "P=s" => \$opt_P, "snmp-port=s"  => \$opt_P,
     "V"   => \$opt_V, "version"      => \$opt_V,
     "s"   => \$opt_s, "show"         => \$opt_s,
     "v=s" => \$opt_v, "snmp=s"       => \$opt_v,
     "C=s" => \$opt_C, "community=s"  => \$opt_C,
     "d=s" => \$opt_d, "disk=s"       => \$opt_d,
     "n"   => \$opt_n, "name"         => \$opt_n,
     "w=s" => \$opt_w, "warning=s"    => \$opt_w,
     "c=s" => \$opt_c, "critical=s"   => \$opt_c,
     "H=s" => \$opt_H, "hostname=s"   => \$opt_H,
     "L"   => \$opt_L, "label"        => \$opt_L,
     "a=s" => \$opt_a, "cache=s"    => \$opt_a,
     "M"   => \$opt_M, 
     "t=s" => \$opt_t);


if ($opt_V) {
    print_revision($PROGNAME,'$Revision: 1.3 $');
    exit $ERRORS{'OK'};
}
if (!defined($opt_P)) {
	$opt_P = 161;
}
if ($opt_h) {
	print_help();
	exit $ERRORS{'OK'};
}
if (!$opt_H) {
	print_usage();
	exit $ERRORS{'OK'};
}

if ($opt_n && !$opt_d) {
    print "Option -n (--name) need option -d (--disk)\n";
    exit $ERRORS{'UNKNOWN'};
}
($opt_v) || ($opt_v = shift) || ($opt_v = "2");
my $snmp = $1 if ($opt_v =~ /(\d)/);

if ($snmp eq "3") {
	if (!$opt_u) {
		print "Option -u (--username) is required for snmpV3\n";
		exit $ERRORS{'OK'};
	}
	if (!$opt_p && !$opt_k) {
		print "Option -k (--key) or -p (--password) is required for snmpV3\n";
		exit $ERRORS{'OK'};
	} elsif ($opt_p && $opt_k) {
		print "Only option -k (--key) or -p (--password) is needed for snmpV3\n";
		exit $ERRORS{'OK'};
	}
}

$opt_C = "public" if (!$opt_C);
$opt_d = 2 if (!$opt_d);
$opt_a = 3 if (!$opt_a);

($opt_d) || ($opt_d = shift) || ($opt_d = 2);

my $partition = 0;
if ($opt_d =~ /([0-9]+)/ && !$opt_n){
    $partition = $1;
} elsif (!$opt_n){
    print "Unknown -d number expected... or it doesn't exist, try another disk - number\n";
    exit $ERRORS{'UNKNOWN'};
}
if (!$opt_c) {
	$opt_c = 95;
}
if (!$opt_w) {
	$opt_w = 90;
}

# this are boolean variables to see if --warn or --crit were set in MB/GB
# --warn and --crit values will be stored in $warning and $critical variables
# if they are set in GB they are converted to MB 
my $criticalMB = 0;
my $warningMB = 0;

my $critical = 95;
if ($opt_c && $opt_c =~ /^[0-9]+$/) {
    $critical = $opt_c;
}
if ($opt_c && $opt_c =~ /^([0-9]+)(.)[Bb]$/) {
    $criticalMB = 1;
    $critical = $1;
    ($critical = $critical * 1024) if $2 =~ /[Gg]/ ;
}

my $warning = 90;
if ($opt_w && $opt_w =~ /^[0-9]+$/) {
    $warning = $opt_w;
}
if ($opt_w && $opt_w =~ /^([0-9]+)(.)[Bb]$/) {
    $warningMB = 1;
    $warning = $1;
    ($warning = $warning * 1024) if $2 =~ /[Gg]/ ;
}

# If one of the warning/critical thresholds is set in MB/GB and the other in percent the check will fail
# if both are percent or storage size the check will be performed in different ways
# percent applies to used space so --crit must be higher than --warn
# MB applies to free space so --crit must be lower than --warn
if ($criticalMB == $warningMB) {
    if ($criticalMB && ($critical >= $warning)) {
		print "(--crit) must be inferior to (--warn) when using absolute size";
		print_usage();
		exit $ERRORS{'OK'};
    } 
    if (!$criticalMB && ($critical <= $warning)) {
		print "(--crit) must be superior to (--warn)";
		print_usage();
		exit $ERRORS{'OK'};
    }
} else {
	print "(--crit) and (--warn) must both use either percent or absolute sizes";
	print_usage();
	exit $ERRORS{'OK'};
}


my $name = $0;
$name =~ s/\.pl.*//g;

# Plugin snmp requests
my $OID_hrStorageDescr = "";
if (defined($opt_t) && ($opt_t eq "AIX" || $opt_t eq "AS400")){
	$OID_hrStorageDescr = ".1.3.6.1.2.1.25.3.8.1.2";
} else { 
	$OID_hrStorageDescr = $centreon{MIB2}{HR_STORAGE_DESCR};
}
my $OID_hrStorageAllocationUnits = $centreon{MIB2}{HR_STORAGE_ALLOCATION_UNITS};
my $OID_hrStorageSize = $centreon{MIB2}{HR_STORAGE_SIZE};
my $OID_hrStorageUsed = $centreon{MIB2}{HR_STORAGE_USED};

# create a SNMP session
my ($session, $error);
if ($snmp eq "1" || $snmp eq "2") {
	($session, $error) = Net::SNMP->session(-hostname => $opt_H, -community => $opt_C, -version => $snmp, -port => $opt_P);
	if (!defined($session)) {
	    print("UNKNOWN: SNMP Session : $error\n");
	    exit $ERRORS{'UNKNOWN'};
	}
} elsif ($opt_k) {
    ($session, $error) = Net::SNMP->session(-hostname => $opt_H, -version => $snmp, -username => $opt_u, -authkey => $opt_k, -port => $opt_P);
	if (!defined($session)) {
	    print("UNKNOWN: SNMP Session : $error\n");
	    exit $ERRORS{'UNKNOWN'};
	}
} elsif ($opt_p) {
    ($session, $error) = Net::SNMP->session(-hostname => $opt_H, -version => $snmp,  -username => $opt_u, -authpassword => $opt_p, -port => $opt_P);
	if (!defined($session)) {
	    print("UNKNOWN: SNMP Session : $error\n");
	    exit $ERRORS{'UNKNOWN'};
	}
}
$session->translate(Net::SNMP->TRANSLATE_NONE) if (defined($session));


my $cacheFile = "/var/lib/centreon/centplugins/remote_storage_cache_".$opt_H;
my $result;
my $mustCreateFile = 0;
my $row;
my $countLine;

#
# Cache File exists, lets read it
#
if (-e $cacheFile) {
    open(FILE,"<".$cacheFile);
    $countLine = 0;
    while ($row = <FILE>){
        if (!$countLine) {
            my $deltaTime = time() -  $row;
            if ($deltaTime > ($opt_a * 3600)) {
                $mustCreateFile = 1;
            }
        }
        $countLine++;
    }
    close(FILE);
}
else {
    $mustCreateFile = 1;
}

if ($mustCreateFile) {
    $result = $session->get_table(Baseoid => $OID_hrStorageDescr);
    unless (open(FILE,">".$cacheFile)){
        print "Check mod for temporary file : ".$cacheFile."...\n";
        exit $ERRORS{"UNKNOWN"};
    }
    my $currentTime = time();
    print FILE $currentTime."\n";
    foreach my $key (oid_lex_sort(keys %$result)) {
        if (defined($opt_t) && $opt_t eq "AS400"){
            $result->{$key} =~ s/\ //g;
        }        
	   	my @oid_list = split (/\./,$key);
	   	my $partitionIndex = pop (@oid_list);
        print FILE $partitionIndex.";".$result->{$key}."\n";
    }
    close(FILE);
}


#getting partition using its name instead of its oid index
if ($opt_n) {    
    if (!-e $cacheFile) {
        printf("ERROR: Could not open " . $cacheFile);        
        exit $ERRORS{'UNKNOWN'};
    }

    my $expr = "";
    if ($opt_d =~ m/^[A-Za-z]:/i) {
		$opt_d =~ s/\\/\\\\/g;
		$expr = "^$opt_d";
    }elsif ($opt_d =~ m/^\//) {
		$expr = "$opt_d\$";
    }else {
		$expr = "$opt_d";
    }
    
    open(FILE,"<".$cacheFile);
    $countLine = 0;
    while ($row = <FILE>){
        if ($countLine) {
            my @resLine = split(/\;/, $row);
            if ($resLine[1] =~ m/$expr/) {    	   	 	
    	   	 	$partition = $resLine[0];
            }
        }
        $countLine++;
    }
    if ($countLine == 1) {
    	unlink($cacheFile);
    }
    close(FILE);    
}

if ($opt_s) {
    if (!-e $cacheFile) {
        printf("ERROR: Could not open " . $cacheFile);        
        exit $ERRORS{'UNKNOWN'};
    }

    open(FILE,"<".$cacheFile);
    $countLine = 0;
    while ($row = <FILE>){
        if ($countLine) {
            my @resLine = split(/\;/, $row);
            print "hrStorage ".$resLine[0]." :: ".$resLine[1];
        }
        $countLine++;
    }
    close(FILE);
	exit $ERRORS{'OK'};
}


$result = $session->get_request(
                            -varbindlist => [$OID_hrStorageDescr.".".$partition  ,
                                             $OID_hrStorageAllocationUnits.".".$partition  ,
                                             $OID_hrStorageSize.".".$partition,
                                             $OID_hrStorageUsed.".".$partition
                                            ]
                                );

if (!defined($result)) {
    printf("ERROR:  %s.\n", $session->error);
    if ($opt_n) { print(" - You must specify the disk name when option -n is used");}
    print ".\n";
    $session->close;
    exit $ERRORS{'UNKNOWN'};
}

$hrStorageDescr  =  $result->{$OID_hrStorageDescr.".".$partition };
$AllocationUnits  =  $result->{$OID_hrStorageAllocationUnits.".".$partition };
$Size  =  $result->{$OID_hrStorageSize.".".$partition };
$Used  =  $result->{$OID_hrStorageUsed.".".$partition };

$hrStorageLabel = $hrStorageDescr;
if ($hrStorageDescr =~ /Label:(.*) Serial Number/) {
	$hrStorageLabel = $1;
} else {
	$hrStorageLabel = '';
}


# Plugins var treatmen

if (!$Size){
    print "Disk CRITICAL - no output (-p number expected... it doesn't exist, try another disk number)\n";
    exit $ERRORS{'CRITICAL'};
}

if (($Size =~  /([0-9]+)/) && ($AllocationUnits =~ /([0-9]+)/)){
	
	if ($hrStorageDescr =~ /\:/){
        my @tab = split(/\:/, $hrStorageDescr);
        $hrStorageDescr = $tab[0] . ":";
    }
	
    if (!$Size){
        print "The number of the option -p is not a hard drive\n";
        exit $ERRORS{'CRITICAL'};
    }
    $tot = 1;
    $tot = $Size * $AllocationUnits;
    if (!$tot){$tot = 1;}
    $used = $Used * $AllocationUnits;
    $pourcent = ($used * 100) / $tot;

    if (length($pourcent) > 2){
        @test = split (/\./, $pourcent);
        $pourcent = $test[0];
    }
    my $totMB = $tot / 1048576;
    my $usedMB = $used / 1048576;
    my $freeMB = $totMB - $usedMB;
    my $totGB = $totMB / 1024;
    my $usedGB = $usedMB / 1024;
    my $freeGB = $freeMB / 1024;
    
    # Plugin return code
    
    if ($criticalMB ? ($freeMB <= $critical) : ($pourcent >= $critical)) {
        print "Disk CRITICAL - ";
        $return_code = 2;
    } elsif ($warningMB ? ($freeMB <= $warning) : ($pourcent >= $warning)) {
        print "Disk WARNING - ";
        $return_code = 1;
    } else {
        print "Disk OK - ";
        $return_code = 0;
    }

    if ($hrStorageDescr){
        $hrStorageDescr =~ s/\ //g if (defined($opt_t) && $opt_t eq "AS400");
	my $warn; my $crit;
        $warn = $warningMB ? $tot-$warning*1024*1024 : int($warning * $tot / 100);
        $crit = $criticalMB ? $tot-$critical*1024*1024 : int($critical * $tot / 100);
	if ($opt_M){
           printf($hrStorageDescr . " TOTAL: %dMB USED: %dMB (%d%%) FREE: %dMB (%d%%)", $totMB, $usedMB, $pourcent, $freeMB, 100-$pourcent );
	} else {
           printf($hrStorageDescr . " TOTAL: %.3fGB USED: %.3fGB (%d%%) FREE: %.3fGB (%d%%)", $totGB, $usedGB, $pourcent, $freeGB, 100-$pourcent );
	}
	if ($opt_L) {
		print " - ".$hrStorageLabel;
	}
        print "|size=".$tot."B used=".$used."B;".$warn.";".$crit.";0;".$tot."\n";
        exit $return_code;
    } else {
        printf("TOTAL: %.3fGB USED: %.3fGB (%d%%)", $totMB, $usedMB, $pourcent );
        exit $return_code;
    }
} else {
    print "Disk CRITICAL - no output (-d number expected... it doesn't exist, try another disk number)\n";
    exit $ERRORS{'CRITICAL'};
}

sub print_usage () {
    print "\nUsage:\n";
    print "$PROGNAME\n";
    print "   -H (--hostname)   Hostname to query - (required)\n";
    print "   -C (--community)  SNMP read community (default: public)\n";
    print "                     used with SNMP v1 and v2c\n";
    print "   -v (--snmp_version)  1 for SNMP v1 (default)\n";
    print "                        2 for SNMP v2c\n";
    print "   -P (--snmp-port)	SNMP port (default: 161)\n";
    print "   -k (--key)        snmp V3 key\n";
    print "   -p (--password)   snmp V3 password\n";
    print "   -u (--username)   snmp v3 username \n";
    print "   -d (--disk)       Set the disk (number expected) ex: 1, 2,... (default: 2 )\n";
    print "   -n (--name)       Allows to use disk name with option -d instead of disk oid index\n";
    print "                     (ex: -d \"C:\" -n, -d \"E:\" -n, -d \"Swap Memory\" -n, -d \"Real Memory\" -n\n";
    print "                     (choose an unique expression for each disk)\n";
    print "   -s (--show)       Lists all disks (debug mode)\n";
    print "   -w (--warn)       Minimum fill level at which a warning message will be generated\n";
    print "                     (default 80)\n";
    print "                     By using the optional suffixes MB/GB the argument is interpreted as absolute size \n";
    print "                     and it becomes a threshold for free space. (ex. 100MB; 3GB)\n";
    print "   -c (--crit)       Minimum fill level at which a critical message will be generated\n";
    print "                     (default 95)\n";
    print "                     By using the optional suffixes MB/GB the argument is interpreted as absolute size \n";
    print "                     and it becomes a threshold for free space. (ex. 50MB; 1GB)\n";
    print "                     ex.: -w 1GB -c 256MB generates a warning when free space reaches 1GB\n";
    print "                          and critical when there are less than 256MB left\n";
    print "   -V (--version)    Plugin version\n";
    print "   -L                add Windows drive label to output\n";
    print "   -M                Shows the size in output in MB instead of GB\n";
    print "   -a (--cache)      Updates cache file every n hours instead of doing snmpwalk for every check (default: 3)\n";
    print "   -h (--help)       usage help\n";

}

sub print_help () {
    print "##############################################\n";
    print "#    Copyright (c) 2004-2011 Centreon        #\n";
    print "#    Bugs to http://forge.centreon.com/      #\n";
    print "##############################################\n";
    print_usage();
    print "\n";
}
