#!/usr/bin/perl -w 
############################## check_snmp_load #################
my $Version='1.0';
# Date    : 2009/11/23
# Author  : Mathias Mahnke 
# Licence : GPL - http://www.fsf.org/licenses/gpl.txt
# Contributors : Patrick Proy (check_snmp_cpu)
#################################################################
#
# Help : ./check_cisco_ips.pl -h
#

use strict;
use Net::SNMP;
use Getopt::Long;

# Nagios specific

my $TIMEOUT = 15;
my %ERRORS=('OK'=>0,'WARNING'=>1,'CRITICAL'=>2,'UNKNOWN'=>3,'DEPENDENT'=>4);

# SNMP Datas

# Cisco IPS CPU

my $cisco_cpu_5m = "1.3.6.1.4.1.9.9.109.1.1.1.1.8.1"; # Cisco CPU load (5min %)
my $cisco_cpu_1m = "1.3.6.1.4.1.9.9.109.1.1.1.1.7.1"; # Cisco CPU load (1min %)
my $cisco_cpu_5s = "1.3.6.1.4.1.9.9.109.1.1.1.1.6.1"; # Cisco CPU load (5sec %)

# Cisco IPS Memory

my $cisco_mem_used = "1.3.6.1.4.1.9.9.221.1.1.1.1.7.1.1"; # Cisco Mem Used
my $cisco_mem_free = "1.3.6.1.4.1.9.9.221.1.1.1.1.8.1.1"; # Cisco Mem Free 

# Cisco IPS Health

my $cisco_hea_loss = "1.3.6.1.4.1.9.9.383.1.4.1.0"; # HealthPacketLoss
my $cisco_hea_rate = "1.3.6.1.4.1.9.9.383.1.4.2.0"; # HealthPacketDenialRate
my $cisco_hea_mem = "1.3.6.1.4.1.9.9.383.1.4.14.0"; # HealthIsSensorMemoryCritical
my $cisco_hea_act = "1.3.6.1.4.1.9.9.383.1.4.15.0"; # HealthIsSensorActive

# valid values 
my @valid_types = ("cpu","mem","health");

# Globals
my $o_host = 	undef; 		# hostname
my $o_community = undef; 	# community
my $o_port = 	161; 		# port
my $o_help=	undef; 		# wan't some help ?
my $o_verb=	undef;		# verbose mode
my $o_version=	undef;		# print version
# check type  : cpu | mem
my $o_check_type= "cpu";	
# End compatibility
my $o_warn=	undef;		# warning level
my @o_warnL=	undef;		# warning levels for Linux Load or Cisco CPU
my $o_crit=	undef;		# critical level
my @o_critL=	undef;		# critical level for Linux Load or Cisco CPU
my $o_timeout=  undef; 		# Timeout (Default 5)
my $o_perf=     undef;          # Output performance data
my $o_version2= undef;          # use snmp v2c
# SNMPv3 specific
my $o_login=	undef;		# Login for snmpv3
my $o_passwd=	undef;		# Pass for snmpv3
my $v3protocols=undef;	# V3 protocol list.
my $o_authproto='md5';		# Auth protocol
my $o_privproto='des';		# Priv protocol
my $o_privpass= undef;		# priv password

# functions

sub p_version { print "check_cisco_ips version : $Version\n"; }

sub print_usage {
    print "Usage: $0 [-v] -H <host> -C <snmp_community> [-2] | (-l login -x passwd [-X pass -L <authp>,<privp>])  [-p <port>] -w <warn level> -c <crit level> -T [cpu|mem|health] [-f] [-t <timeout>] [-V]\n";
}

sub isnnum { # Return true if arg is not a number
  my $num = shift;
  if ( $num =~ /^(\d+\.?\d*)|(^\.\d+)$/ ) { return 0 ;}
  return 1;
}

sub help {
   print "\nSNMP Cisco IPS Monitor for Nagios version ",$Version,"\n";
   print "GPL licence, 2009 Mathias Mahnke\n\n";
   print_usage();
   print <<EOT;
-v, --verbose
   print extra debugging information 
-h, --help
   print this help message
-H, --hostname=HOST
   name or IP address of host to check
-C, --community=COMMUNITY NAME
   community name for the host's SNMP agent (implies v1 protocol)
-2, --v2c
   Use snmp v2c
-l, --login=LOGIN ; -x, --passwd=PASSWD
   Login and auth password for snmpv3 authentication 
   If no priv password exists, implies AuthNoPriv 
-X, --privpass=PASSWD
   Priv password for snmpv3 (AuthPriv protocol)
-L, --protocols=<authproto>,<privproto>
   <authproto> : Authentication protocol (md5|sha : default md5)
   <privproto> : Priv protocole (des|aes : default des) 
-P, --port=PORT
   SNMP port (Default 161)
-w, --warn=INTEGER | INT,INT,INT
   1 value check : warning level for cpu in percent (on one minute)
   3 value check : comma separated level for load or cpu for 1min, 5min, 15min 
-c, --crit=INTEGER | INT,INT,INT
   critical level for cpu in percent (on one minute)
   1 value check : critical level for cpu in percent (on one minute)
   3 value check : comma separated level for load or cpu for 1min, 5min, 15min 
-T, --type=cpu|mem|health
	IPS check : 
		cpu : Cisco IPS CPU usage
		mem : Cisco IPS memory usage
                health : Cisco IPS health status 
-f, --perfparse
   Perfparse compatible output
-t, --timeout=INTEGER
   timeout for SNMP in seconds (Default: 5)
-V, --version
   prints version number
EOT
}

# For verbose output
sub verb { my $t=shift; print $t,"\n" if defined($o_verb) ; }

sub check_options {
    Getopt::Long::Configure ("bundling");
    GetOptions(
   	'v'	=> \$o_verb,		'verbose'	=> \$o_verb,
        'h'     => \$o_help,    	'help'        	=> \$o_help,
        'H:s'   => \$o_host,		'hostname:s'	=> \$o_host,
        'p:i'   => \$o_port,   		'port:i'	=> \$o_port,
        'C:s'   => \$o_community,	'community:s'	=> \$o_community,
	'l:s'	=> \$o_login,		'login:s'	=> \$o_login,
	'x:s'	=> \$o_passwd,		'passwd:s'	=> \$o_passwd,
	'X:s'	=> \$o_privpass,		'privpass:s'	=> \$o_privpass,
	'L:s'	=> \$v3protocols,		'protocols:s'	=> \$v3protocols,   
        't:i'   => \$o_timeout,       	'timeout:i'     => \$o_timeout,
	'V'	=> \$o_version,		'version'	=> \$o_version,
	'2'     => \$o_version2,        'v2c'           => \$o_version2,
        'c:s'   => \$o_crit,            'critical:s'    => \$o_crit,
        'w:s'   => \$o_warn,            'warn:s'        => \$o_warn,
        'f'     => \$o_perf,            'perfparse'     => \$o_perf,
	'T:s'	=> \$o_check_type,	'type:s'	=> \$o_check_type
	);
    # check the -T option
    my $T_option_valid=0; 
    foreach (@valid_types) { if ($_ eq $o_check_type) {$T_option_valid=1} };
    if ( $T_option_valid == 0 ) 
       {print "Invalid check type (-T)!\n"; print_usage(); exit $ERRORS{"UNKNOWN"}}
    # Basic checks
	if (defined($o_timeout) && (isnnum($o_timeout) || ($o_timeout < 2) || ($o_timeout > 60))) 
	  { print "Timeout must be >1 and <60 !\n"; print_usage(); exit $ERRORS{"UNKNOWN"}}
	if (!defined($o_timeout)) {$o_timeout=5;}
    if (defined ($o_help) ) { help(); exit $ERRORS{"UNKNOWN"}};
    if (defined($o_version)) { p_version(); exit $ERRORS{"UNKNOWN"}};
    if ( ! defined($o_host) ) # check host and filter 
	{ print_usage(); exit $ERRORS{"UNKNOWN"}}
    # check snmp information
    if ( !defined($o_community) && (!defined($o_login) || !defined($o_passwd)) )
	  { print "Put snmp login info!\n"; print_usage(); exit $ERRORS{"UNKNOWN"}}
	if ((defined($o_login) || defined($o_passwd)) && (defined($o_community) || defined($o_version2)) )
	  { print "Can't mix snmp v1,2c,3 protocols!\n"; print_usage(); exit $ERRORS{"UNKNOWN"}}
	if (defined ($v3protocols)) {
	  if (!defined($o_login)) { print "Put snmp V3 login info with protocols!\n"; print_usage(); exit $ERRORS{"UNKNOWN"}}
	  my @v3proto=split(/,/,$v3protocols);
	  if ((defined ($v3proto[0])) && ($v3proto[0] ne "")) {$o_authproto=$v3proto[0];	}	# Auth protocol
	  if (defined ($v3proto[1])) {$o_privproto=$v3proto[1];	}	# Priv  protocol
	  if ((defined ($v3proto[1])) && (!defined($o_privpass))) {
	    print "Put snmp V3 priv login info with priv protocols!\n"; print_usage(); exit $ERRORS{"UNKNOWN"}}
	}
    # Check warnings and critical
    if (!defined($o_warn) || !defined($o_crit))
 	{ print "put warning and critical info!\n"; print_usage(); exit $ERRORS{"UNKNOWN"}}
    # Get rid of % sign
    $o_warn =~ s/\%//g; 
    $o_crit =~ s/\%//g;
    # Check for multiple warning and crit in case of -L
	if ($o_check_type eq "cpu") { 
		@o_warnL=split(/,/ , $o_warn);
		@o_critL=split(/,/ , $o_crit);
		if (($#o_warnL != 2) || ($#o_critL != 2)) 
			{ print "3 warnings and critical !\n";print_usage(); exit $ERRORS{"UNKNOWN"}}
		for (my $i=0;$i<3;$i++) {
			if ( isnnum($o_warnL[$i]) || isnnum($o_critL[$i])) 
				{ print "Numeric value for warning or critical !\n";print_usage(); exit $ERRORS{"UNKNOWN"}}
			if ($o_warnL[$i] > $o_critL[$i]) 
				{ print "warning <= critical ! \n";print_usage(); exit $ERRORS{"UNKNOWN"}}
		}
	} else { 
	if ($o_check_type eq "health") { 
		@o_warnL=split(/,/ , $o_warn);
		@o_critL=split(/,/ , $o_crit);
		if (($#o_warnL != 3) || ($#o_critL != 3)) 
			{ print "4 warnings and critical !\n";print_usage(); exit $ERRORS{"UNKNOWN"}}
		for (my $i=0;$i<4;$i++) {
			if ( isnnum($o_warnL[$i]) || isnnum($o_critL[$i])) 
				{ print "Numeric value for warning or critical !\n";print_usage(); exit $ERRORS{"UNKNOWN"}}
			if ($i>0 && ($o_warnL[$i] > $o_critL[$i])) 
				{ print "warning <= critical ! \n";print_usage(); exit $ERRORS{"UNKNOWN"}}
		}
	} else {
		if (($o_warn =~ /,/) || ($o_crit =~ /,/)) {
             { print "Multiple warning/critical levels not available for this check\n";print_usage(); exit $ERRORS{"UNKNOWN"}}
		}
        	if ( isnnum($o_warn) || isnnum($o_crit) ) 
			{ print "Numeric value for warning or critical !\n";print_usage(); exit $ERRORS{"UNKNOWN"}}
			if ($o_warn > $o_crit) 
            		{ print "warning <= critical ! \n";print_usage(); exit $ERRORS{"UNKNOWN"}}
		} 
	}
}

########## MAIN #######

check_options();

# Check gobal timeout if snmp screws up
if (defined($TIMEOUT)) {
  verb("Alarm at $TIMEOUT + 5");
  alarm($TIMEOUT+5);
} else {
  verb("no global timeout defined : $o_timeout + 10");
  alarm ($o_timeout+10);
}

$SIG{'ALRM'} = sub {
 print "No answer from host\n";
 exit $ERRORS{"UNKNOWN"};
};

# Connect to host
my ($session,$error);
if ( defined($o_login) && defined($o_passwd)) {
  # SNMPv3 login
  verb("SNMPv3 login");
    if (!defined ($o_privpass)) {
  verb("SNMPv3 AuthNoPriv login : $o_login, $o_authproto");
    ($session, $error) = Net::SNMP->session(
      -hostname   	=> $o_host,
      -version		=> '3',
      -username		=> $o_login,
      -authpassword	=> $o_passwd,
      -authprotocol	=> $o_authproto,
      -timeout          => $o_timeout
    );  
  } else {
    verb("SNMPv3 AuthPriv login : $o_login, $o_authproto, $o_privproto");
    ($session, $error) = Net::SNMP->session(
      -hostname   	=> $o_host,
      -version		=> '3',
      -username		=> $o_login,
      -authpassword	=> $o_passwd,
      -authprotocol	=> $o_authproto,
      -privpassword	=> $o_privpass,
	  -privprotocol => $o_privproto,
      -timeout          => $o_timeout
    );
  }
} else {
	if (defined ($o_version2)) {
		# SNMPv2 Login
		verb("SNMP v2c login");
		  ($session, $error) = Net::SNMP->session(
		 -hostname  => $o_host,
		 -version   => 2,
		 -community => $o_community,
		 -port      => $o_port,
		 -timeout   => $o_timeout
		);
  	} else {
	  # SNMPV1 login
	  verb("SNMP v1 login");
	  ($session, $error) = Net::SNMP->session(
		-hostname  => $o_host,
		-community => $o_community,
		-port      => $o_port,
		-timeout   => $o_timeout
	  );
	}
}
if (!defined($session)) {
   printf("ERROR opening session: %s.\n", $error);
   exit $ERRORS{"UNKNOWN"};
}

my $exit_val=undef;
############## Cisco IPS CPU check ################

if ($o_check_type eq "cpu") {
my @oidlists = ($cisco_cpu_5m, $cisco_cpu_1m, $cisco_cpu_5s);
my $resultat = (Net::SNMP->VERSION < 4) ?
	  $session->get_request(@oidlists)
	: $session->get_request(-varbindlist => \@oidlists);

if (!defined($resultat)) {
   printf("ERROR: Description table : %s.\n", $session->error);
   $session->close;
   exit $ERRORS{"UNKNOWN"};
}

$session->close;

if (!defined ($$resultat{$cisco_cpu_5s})) {
  print "No CPU information : UNKNOWN\n";
  exit $ERRORS{"UNKNOWN"};
}

my @load = undef;

$load[0]=$$resultat{$cisco_cpu_5s};
$load[1]=$$resultat{$cisco_cpu_1m};
$load[2]=$$resultat{$cisco_cpu_5m};

print "Cisco IPS CPU : 5sec = $load[0] %, 2min = $load[1] %, 5min = $load[2] % :";

$exit_val=$ERRORS{"OK"};
for (my $i=0;$i<3;$i++) {
  if ( $load[$i] > $o_critL[$i] ) {
   print " $load[$i] > $o_critL[$i] : CRITICAL";
   $exit_val=$ERRORS{"CRITICAL"};
  }
  if ( $load[$i] > $o_warnL[$i] ) {
     # output warn error only if no critical was found
     if ($exit_val eq $ERRORS{"OK"}) {
       print " $load[$i] > $o_warnL[$i] : WARNING"; 
       $exit_val=$ERRORS{"WARNING"};
     }
  }
}
print " OK" if ($exit_val eq $ERRORS{"OK"});
if (defined($o_perf)) {
   print " | load_5_sec=$load[0]%;$o_warnL[0];$o_critL[0] ";
   print "load_1_min=$load[1]%;$o_warnL[1];$o_critL[1] ";
   print "load_5_min=$load[2]%;$o_warnL[2];$o_critL[2]\n";
} else {
 print "\n";
}

exit $exit_val;
}

############## Cisco IPS memory check ################

if ($o_check_type eq "mem") {
my @oidlists = ($cisco_mem_used, $cisco_mem_free);
my $resultat = (Net::SNMP->VERSION < 4) ?
	  $session->get_request(@oidlists)
	: $session->get_request(-varbindlist => \@oidlists);

if (!defined($resultat)) {
   printf("ERROR: Description table : %s.\n", $session->error);
   $session->close;
   exit $ERRORS{"UNKNOWN"};
}

$session->close;

if (!defined ($$resultat{$cisco_mem_used})) {
  print "No Memory information : UNKNOWN\n";
  exit $ERRORS{"UNKNOWN"};
}

my @load = undef;

$load[0]=int($$resultat{$cisco_mem_used}/1024/1024);
$load[1]=int($$resultat{$cisco_mem_free}/1024/1024);
$load[2]=int($load[0]/($load[0]+$load[1])*100);

print "Cisco IPS Memory : used = $load[0] MB, free = $load[1] MB, utilization = $load[2] % :";

$exit_val=$ERRORS{"OK"};
if ( $load[2] > $o_crit ) {
 print " $load[2] > $o_crit : CRITICAL";
 $exit_val=$ERRORS{"CRITICAL"};
}
if ( $load[2] > $o_warn ) {
   # output warn error only if no critical was found
   if ($exit_val eq $ERRORS{"OK"}) {
     print " $load[2] > $o_warn : WARNING"; 
     $exit_val=$ERRORS{"WARNING"};
   }
}
print " OK" if ($exit_val eq $ERRORS{"OK"});
if (defined($o_perf)) {
   print " | utilization=$load[2]%;$o_warnL[0];$o_crit ";
} else {
 print "\n";
}

exit $exit_val;
}

############## Cisco IPS health check ################

if ($o_check_type eq "health") {
my @oidlists = ($cisco_hea_loss, $cisco_hea_rate, $cisco_hea_mem, $cisco_hea_act);
my $resultat = (Net::SNMP->VERSION < 4) ?
	  $session->get_request(@oidlists)
	: $session->get_request(-varbindlist => \@oidlists);

if (!defined($resultat)) {
   printf("ERROR: Description table : %s.\n", $session->error);
   $session->close;
   exit $ERRORS{"UNKNOWN"};
}

$session->close;

if (!defined ($$resultat{$cisco_hea_act})) {
  print "No health information : UNKNOWN\n";
  exit $ERRORS{"UNKNOWN"};
}

my @load = undef;

$load[0]=1-$$resultat{$cisco_hea_act};
$load[1]=$$resultat{$cisco_hea_mem};
$load[2]=$$resultat{$cisco_hea_loss};
$load[3]=$$resultat{$cisco_hea_rate};

print "Cisco IPS Health : inactive = $load[0], memory critical = $load[1], packet loss = $load[2] %, packet deny rate = $load[3] % :";

$exit_val=$ERRORS{"OK"};
for (my $i=0;$i<4;$i++) {
  if ( $load[$i] > $o_critL[$i] ) {
   print " $load[$i] > $o_critL[$i] : CRITICAL";
   $exit_val=$ERRORS{"CRITICAL"};
  }
  if ( $load[$i] > $o_warnL[$i] ) {
     # output warn error only if no critical was found
     if ($exit_val eq $ERRORS{"OK"}) {
       print " $load[$i] > $o_warnL[$i] : WARNING"; 
       $exit_val=$ERRORS{"WARNING"};
     }
  }
}
print " OK" if ($exit_val eq $ERRORS{"OK"});
if (defined($o_perf)) {
   print " | load_5_sec=$load[0]%;$o_warnL[0];$o_critL[0] ";
   print "load_1_min=$load[1]%;$o_warnL[1];$o_critL[1] ";
   print "load_5_min=$load[2]%;$o_warnL[2];$o_critL[2]\n";
} else {
 print "\n";
}

exit $exit_val;
}