#! /usr/bin/perl -w
################################################################################
# Copyright 2004-2013 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 : $URL$
# SVN : $Id$
#
####################################################################################
#
# Plugin init
#

use strict;
require "/DBA/nagios/nagios-plugins/1.latest/plugins/Centreon/SNMP/Utils.pm";

use vars qw($PROGNAME);
use Getopt::Long;
use vars qw($opt_V $opt_h $opt_w $opt_c);

my %ERRORS = ('OK' => 0, 'WARNING' => 1, 'CRITICAL' => 2, 'UNKNOWN' => 3);
my $centplugins_path = "/DBA/centreon-data/centreon-plugins/tmp";

#
# Plugin var init
#
$PROGNAME = "$0";

my ($row, @flg_created, @last_check_time, @last_in_errors, @last_out_errors, $result_in, $result_out, @nb_out_errors, @nb_in_errors, $update_time, $db_file);

sub print_help ();
sub print_usage ();

my %OPTION = (
    "host" => undef,
    "snmp-community" => "public", "snmp-version" => 1, "snmp-port" => 161, 
    "snmp-auth-key" => undef, "snmp-auth-user" => undef, "snmp-auth-password" => undef, "snmp-auth-protocol" => "MD5",
    "snmp-priv-key" => undef, "snmp-priv-password" => undef, "snmp-priv-protocol" => "DES",
    "maxrepetitions" => undef, "snmptimeout" => undef,
    "64-bits" => undef,
);

Getopt::Long::Configure('bundling');
GetOptions
    (
    "H|hostname|host=s"         => \$OPTION{'host'},
    "C|community=s"             => \$OPTION{'snmp-community'},
    "v|snmp|snmp-version=s"     => \$OPTION{'snmp-version'},
    "P|snmpport|snmp-port=i"    => \$OPTION{'snmp-port'},
    "u|username=s"              => \$OPTION{'snmp-auth-user'},
    "p|authpassword|password=s" => \$OPTION{'snmp-auth-password'},
    "k|authkey=s"               => \$OPTION{'snmp-auth-key'},
    "authprotocol=s"            => \$OPTION{'snmp-auth-protocol'},
    "privpassword=s"            => \$OPTION{'snmp-priv-password'},
    "privkey=s"                 => \$OPTION{'snmp-priv-key'},
    "privprotocol=s"            => \$OPTION{'snmp-priv-protocol'},
    "maxrepetitions=s"          => \$OPTION{'maxrepetitions'},
    "snmp-timeout=i"            => \$OPTION{'snmptimeout'},
    "64-bits"                   => \$OPTION{'64-bits'},

    "h"   => \$opt_h, "help"         => \$opt_h,
    "V"   => \$opt_V, "version"      => \$opt_V,
    "w=s" => \$opt_w, "warning=s"    => \$opt_w,
    "c=s" => \$opt_c, "critical=s"   => \$opt_c);

if ($opt_V) {
    print_revision($PROGNAME,'$Revision: 1.2 $');
    exit $ERRORS{'OK'};
}

if ($opt_h) {
    print_help();
    exit $ERRORS{'OK'};
}

##################################################
#####      Verify Options
##

my ($session_params) = Centreon::SNMP::Utils::check_snmp_options($ERRORS{'UNKNOWN'}, \%OPTION);

($opt_c) || ($opt_c = shift) || ($opt_c = 100);
my $critical = $1 if ($opt_c =~ /([0-9]+)/);

($opt_w) || ($opt_w = shift) || ($opt_w = 80);
my $warning = $1 if ($opt_w =~ /([0-9]+)/);

if ($critical <= $warning){
    print "(--crit) must be superior to (--warn)";
    print_usage();
    exit $ERRORS{'OK'};
}

my $start = time;

#################################################
#####            Plugin snmp requests
##

my $OID_IN_ERRORS = ".1.3.6.1.2.1.2.2.1.14";
my $OID_OUT_ERRORS = ".1.3.6.1.2.1.2.2.1.20";
my $OID_IF_DESC = ".1.3.6.1.2.1.2.2.1.2";


# create a SNMP session
my $session = Centreon::SNMP::Utils::connection($ERRORS{'UNKNOWN'}, $session_params);

#######  Get IN ERRORS
$result_in = Centreon::SNMP::Utils::get_snmp_table($OID_IN_ERRORS, $session, $ERRORS{'UNKNOWN'}, \%OPTION);

# loop for each interface
foreach my $err (oid_lex_sort(keys %$result_in)) {
    $nb_in_errors[scalar(@nb_in_errors)] = $result_in->{$err};
}
# #######  Get OUT ERRORS

$result_out = Centreon::SNMP::Utils::get_snmp_table($OID_OUT_ERRORS, $session, $ERRORS{'UNKNOWN'}, \%OPTION);
foreach my $err (oid_lex_sort(keys %$result_out)) {
    $nb_out_errors[scalar(@nb_out_errors)] = $result_out->{$err};
}

# #######  Get Interface descriptions for output
my @desc_tab;
my $if_description = Centreon::SNMP::Utils::get_snmp_table($OID_IF_DESC, $session, $ERRORS{'UNKNOWN'}, \%OPTION);
foreach my $desc (oid_lex_sort(keys %$if_description)) {
    $desc_tab[scalar(@desc_tab)] = $if_description->{$desc} if ($if_description->{$desc} !~ m/StackSub/i);
}


# #############################################
# #####      read and write in buffer file
# ##

for (my $i = 0; $i < scalar(@nb_in_errors); $i++) {
    if (-e $centplugins_path . "/packet_errors_if".$i."_" . $OPTION{'host'} . ".tmp") {
        open(FILE,"<" . $centplugins_path . "/packet_errors_if".$i."_" . $OPTION{'host'} . ".tmp");
        while($row = <FILE>){
            my @last_values = split(":",$row);
            $last_check_time[$i] = $last_values[0];
            $last_in_errors[$i] = $last_values[1];
            $last_out_errors[$i] = $last_values[2];
            $flg_created[$i] = 1;
        }
        close(FILE);
    } else {
        $flg_created[$i] = 0;
    }

    $update_time = time;
    unless (open(FILE,">". $centplugins_path . "/packet_errors_if".$i."_" . $OPTION{'host'} . ".tmp")){
        print "Unknown - $centplugins_path/packet_errors_if".$i."_" . $OPTION{'host'} . ".tmp!\n";
        exit $ERRORS{"UNKNOWN"};
    }
    print FILE "$update_time:$nb_in_errors[$i]:$nb_out_errors[$i]";
    close(FILE);
    if ($flg_created[$i] eq 0){
        print "First execution : Buffer in creation.... \n";
    }
}

# #############################################
# #####          return result
# ##
my $status = "OK";
my @msg;
my $diff_test = 0;
for (my $i = 0; $i < scalar(@nb_in_errors); $i++) {
    my $interface = $i+1;
    if ($flg_created[$i]) {
        if (($nb_in_errors[$i] - $last_in_errors[$i] >= $critical) or ($nb_out_errors[$i] - $last_out_errors[$i] >= $critical)){ 
            $msg[$i] = $desc_tab[$i] . ":critical ";
            $status = "CRITICAL";
        }
        if (($nb_in_errors[$i] - $last_in_errors[$i] >= $warning) or ($nb_out_errors[$i] - $last_out_errors[$i] >= $warning)){
            if (!defined($msg[$i])) {
                $msg[$i] = $desc_tab[$i] . ":warning ";
            }
            if ($status ne "CRITICAL") {
                $status = "WARNING";
            }
        }
        $diff_test = 1;
    }
}

if (!$diff_test) {
    exit($ERRORS{'UNKNOWN'});
}
my $output = "";
for (my $i = 0; $i < scalar (@msg); $i++) {
    if (defined($msg[$i])) {
        $output .= $msg[$i];
    }
}
if ($output ne ""){
    print $output."\n";
} else {
    print "Status OK on all interfaces\n";
}
exit($ERRORS{$status});

sub print_usage () {
    print "\nUsage:\n";
    print "$PROGNAME\n";
    print "   -H (--hostname)   Hostname to query (required)\n";
    print "   -C (--community)  SNMP read community (defaults to 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 "                        3 for SNMP v3\n";
    print "   -P (--snmp-port)  SNMP port (default: 161)\n";
    print "   -k (--authkey)    snmp V3 key\n";
    print "   -u (--username)   snmp V3 username \n";
    print "   -p (--password)   snmp V3 password\n";
    print "   --authprotocol    protocol MD5/SHA  (v3)\n";
    print "   --privprotocol    encryption system (DES/AES)(v3) \n";
    print "   --privpassword    passphrase (v3) \n";
    print "   --64-bits         Use 64 bits OID\n";
    print "   --maxrepetitions  To use when you have the error: 'Message size exceeded buffer maxMsgSize'\n";
    print "                     Work only with SNMP v2c and v3 (Example: --maxrepetitions=1)\n";
    print "   --snmp-timeout    SNMP Timeout\n";
    print "   -w (--warn)       Signal strength at which a warning message will be generated\n";
    print "                     (default 80)\n";
    print "   -c (--crit)       Signal strength at which a critical message will be generated\n";
    print "                     (default 100)\n";
    print "   -V (--version)    Plugin version\n";
    print "   -h (--help)       usage help\n";
}

sub print_help () {
    print "##############################################\n";
    print "#    Copyright (c) 2004-2013 Centreon        #\n";
    print "#    Bugs to http://forge.centreon.com/      #\n";
    print "##############################################\n";
    print_usage();
    print "\n";
}
