File check_esx_gw of Package nagios-plugins-snmp

File check_esx_gw of Package nagios-plugins-snmp (Revision e64f5d3d97b63e3ae07e2e50cb7930c1)

Currently displaying revision e64f5d3d97b63e3ae07e2e50cb7930c1, show latest

#!/usr/bin/perl -w
# vim:ts=4
# check_esx Version 2.4
my($Version) = 0.6;
# Modified by GroundWork to work with ESX 3; renamed to ..._gw to indicate
# a special interim version.  This is considered a temporary working copy
# until the changes are folded back into the main line of development.
#
# Check the status of a virtual machine on a VMware ESX server, via SNMP.
# Return status in standard format for either Nagios or MRTG.
#
# Steve Shipway (www.steveshipway.org) Nov 2004
# Released under GNU GPL
#
# See dohelp{} below for usage, so we only need to maintain one copy
# and we don't get accidental divergence in what is documented.
#
# Version 2.0: Added SNMP agent extension to get memory split and ready time
#         2.1: Corrected some bugs.  Use >0.01 instead of >0.
#         2.2: corrected opt_r bug, fa bug
#         2.3:
#         2.4: simpler guest names for list report
#      gw 0.6: added some support for ESX 3

use strict;
use Net::SNMP;
use Getopt::Std;

my($STATEFILE) = "/var/tmp/esx_state";    # For rate counter (if not agent)
my($VMOID) = "1.3.6.1.4.1.6876";          # VMware MIB
my($UCDOID) = "1.3.6.1.4.1.2021.1000.10"; # where to find the agent plugin
my($SYSOID) = "1.3.6.1.2.1.1.1.0";        # system object to test SNMP working
my($OK,$WARNING,$CRITICAL,$UNKNOWN) = (0,1,2,3);
my(%VisibleStatus) = ($OK => "OK", $WARNING => "WARNING", $CRITICAL => "CRITICAL", $UNKNOWN => "UNKNOWN");
my($DEBUG) = 0;
my($TIMEOUT) = 5;
my($RETRIES) = 1;
my($SWAPINCRIT) = 2; # this many bps swap in is critical (else warn)
my($SWAPPCCRIT) = 4; # this % usage of swap is critical (else warn)
my($from,$to) = (0,99999);
my($snmp,$resp,$snmperr);
my($hostname) = '';
my($community) = 'public'; # Default community string
my($vhost) = '';
my($A, $B, $MSG) = ('U','U','');
my(@perf) = ();
my($STATUS) = $UNKNOWN;
my($MODE) = 0;  # 0 = Nagios, 1 = MRTG
my($VMID) = -1; # set to -1 if not running
my($VMNO) = -1; # set to -1 if not defined
my($vmGuestState) = "notRunning";
my($warn,$crit) = (70,90);   # usage warn/crit: 70/90 is virtualcentre default
my($rwarn,$rcrit) = (5,10); # cpu readytime warn/crit: VMWare say to crit at 5%
my(%lookup) = ();
my(%states) = ();
my(%tmpnet) = ();
my($fa,$sa,$fb,$sb);
my($esx_version) = 3;

use vars qw($opt_C $opt_H $opt_N $opt_M $opt_V $opt_h $opt_c $opt_t $opt_i $opt_d $opt_w $opt_l $opt_v $opt_r $opt_R);

sub base($) {
	return '?' if(!$_[0]);
	return $1 if( $_[0]=~/^(\S+)/ );
	return $_[0];
}

sub dohelp {
	print "Usage: $0 [-h] [-V] [-d] -H host [-C community] [-N | -M [-r]]\n";
	print "          [-l check [-v vhost] [-i interface] [-w warn -c crit]]\n";
	print "          [-t timeout] [-R retries]\n";
	print "    -h: just prints this help message\n";
	print "    -V: just prints the script version number\n";
	print "    -d: puts the script into debug mode\n";
	print "    -H host: ESX server machine\n";
	print "    -C community: the SNMP community string (default is \"public\")\n";
	print "    -N: Nagios mode (the default); need -w and -c for CPU, MEM\n";
	print "    -M: MRTG mode (-r specifies rate rather than counter)\n";
	print "    -l check: can be CPU MEM STATE LIST NET LISTNET (default is LIST)\n";
	print "    -v virtualhost: restrict probing to that one guest host; required for STATE;\n";
	print "        if not specified, probes total ESX system statistics\n";
	print "    -i interface: Only valid for NET\n";
	print "    -w warn -c crit: Nagios thresholds\n";
	print "    -t timeout: ([1..60] seconds) for individual SNMP queries\n";
	print "    -R retries: # of retries ([0..20]) for individual SNMP queries\n";
	print "\nFor MRTG,\n";
	print "    CPU is total seconds (counter) for vhost or total over all if no vhost given.\n";
	print "    MEM is memory remaining in K.\n";
	print "    STATE is 1 for up, 0 for down.\n";
	print "    LIST is number of vhosts.\n";
	print "    NET is network throughput in bytes for specified vhost and/or interface\n";
	print "        (total of all if not specified).\n";
	print "\nFor Nagios, specify thresholds as follows.\n";
	print "    CPU is percentage of allocated CPU (for vhosts) and of total CPU (if no vhost).\n";
	print "    MEM is active memory (for vhosts) or free phys memory (if no vhost) in K or %.\n";
	print "    STATE is CRITICAL if vhost is down.\n";
	print "    LIST is WARN if some are down, CRIT is all vhosts are down.\n";
	print "    NET is bytes/sec since last check, if possible (otherwise UNKNOWN).\n";
	print "\nThresholds for MEM or LIST under Nagios, can be in K or %\n";
	print "    e.g.: -l MEM -w 2048K -c 1024K\n";
	print "    e.g.: -l MEM -v vhost -w 80% -c 90%\n";
	print "    e.g.: -l LIST -w 90% -c 0\n";
	print "    e.g.: -l LIST -w 10 -c 1\n";
	print "Thresholds for CPU are in % (the trailing % symbol is optional)\n";
	print "    e.g.: -l CPU -w 80 -c 90\n";
	print "Thresholds for NET are in BYTES/SEC (cannot use %)\n";
	exit 0;
}

sub readstate {
	return if(! -r $STATEFILE);
	open STATE, "<$STATEFILE" or return;
	flock STATE,1; # read lock
	while( <STATE> ) { $states{$1}=$2 if( /^(\S+)=(\d+)/ ); }
	flock STATE,8; # unlock
	close STATE;
}
sub writestate {
	my(%new) = @_;

# NOTE:  For further discussion of the possible race conditions and security holes
	# here, see Programming Perl, 3/e, pp. 571-576.

# We write-lock the state file for the entire interaction, and we flush the output
	# before releasing the lock, to prevent any avoidable race conditions from showing
	# up. The one race condition this doesn't prevent is multiple independent processes
	# finding the file doesn't exist, and all of them opening the file in some kind of
	# write mode (which is required to create a non-existent file). The race condition
	# here arises because we use a lock mechanism that only allows us to do the locking
	# after the file is opened, and not beforehand. Thus there is no adjudication such
	# that only one process would be able to observe that the file does not yet exist.
	# Whichever of those processes acquires the write lock last will overwrite the
	# contents written by all the previous processes. But that circumstance will only
	# occur in a limited, one-time situation, the file will still be left in a consistent
	# state each time it is unlocked, and it will simply be as if the other processes
	# never ran. The system will recover properly on subsequent runs.
	if(-r $STATEFILE) {
		# We open in read/write mode so we can later write the file without needing
		# to release the lock and close the file between read and write activity.
		# (Closing and re-opening would allow some other process to write the file
		# in between, such that the data we just read would now be stale and those
		# states we are not updating ourselves here would be overwritten here with
		# data which is now out-of-date.)
		open STATE, "+<$STATEFILE" or return;
		flock STATE,2; # write lock
		while( <STATE> ) { $states{$1}=$2 if( /^(\S+)=(\d+)/ ); }
	} else {
		# We open in append mode because that mode doesn't clobber an existing file.
		# That's important so we don't truncate a file which some other process has
		# already write-locked and is already in the middle of writing, and possibly
		# leave around a broken file that some other process might read before we
		# acquire the write lock.
		open STATE, ">>$STATEFILE" or return;
		flock STATE,2; # write lock
	}
	seek STATE,0,0; # rewind
	truncate STATE,0;
	foreach ( keys %new ) { $states{$_} = $new{$_}; }
	foreach ( keys %states ) { print STATE "$_=".$states{$_}."\n"; }
	# Actually, the flock call implicitly flushes the file before releasing the lock,
	# so we don't need to do so explicitly here.
	# my $oldfile = select STATE; $| = 1; select $oldfile; # flush any buffered output
	flock STATE,8; # unlock
	close STATE;
}

sub dooutput {
	if( $MODE ) {
		# MRTG
		$A = 'U' if(!defined $A);
		$B = $A if(!defined $B);
		$MSG = "Returned values: $A, $B\n" if(!$MSG);
		print "$A\n$B\n\n$MSG\n";
		exit 0;
	} else {
		# Nagios
		# Here we follow the format recommended in the Nagios plug-in development guidelines,
		# plus a convention that says the status should be right up front in a readable form, so
		# end-users can see it directly in contexts that might not color-highlight the message.
		# The one thing this doesn't guarantee is that the message isn't so long that either it or
		# the appended performance data doesn't get chopped off due to overall length limitations
		# in the Nagios command pipe.
		print "SERVICE STATUS: ", ($VisibleStatus{$STATUS} || "UNKNOWN"), ": ", $MSG, (scalar @perf ? "|" . join(" ",@perf) : ""), "\n";
		exit $STATUS;
	}
	# should never get here
}

sub makesnmp() {
	($snmp,$snmperr) = Net::SNMP->session( -hostname=>$hostname,
		-community=>$community, -timeout=>$TIMEOUT, -retries=>$RETRIES );
	if($snmperr) {
		$A = $B = 'U';
		print "($snmperr)\n" if($DEBUG);
		$MSG = "Error: $snmperr";
		$STATUS = $UNKNOWN;
		dooutput; # exit
		exit(0);
	}
}
###########################################################################
# Read detailed memory and CPU data from extended snmp daemon, if possible
my(%stats) = ();
my($donereadagent) = 0;
sub readagent {
	return "" if($donereadagent);
	$MSG = "";
	makesnmp() if(!$snmp);
	$resp = $snmp->get_request( -varbindlist=>["$UCDOID.2.1"] );
	if(!$resp) {  # Fall back to the old way
		return 1;
	}
	if( $resp->{"$UCDOID.2.1"} ne 'vmware' ) {
		$MSG = "Incorrect SNMPD configuration: found '".$resp->{"$UCDOID.2.1"}."' when expected 'vmware'";
		$STATUS = $UNKNOWN;
		return 1;
	}
	$resp = $snmp->get_table( -baseoid=>"$UCDOID.101" );
	if(!$resp) {  # Fall back to the old way
#		$MSG = "SNMP error: ".$snmp->error;
		return 1;
	}
	# Convert the retrieved values to lookup hash
	foreach my $oid ( keys %$resp ) {
		if(( $oid =~ /\.101\.\d+$/ ) and ( $resp->{$oid}=~/^(\S+)=(.*)$/)) {
			$stats{$1}=$2;
		}
	}
	$donereadagent = 1;
	return "";
}

sub getesxversion {
	print "(snmp lookup)\n" if($DEBUG);
	makesnmp() if(!$snmp);
	$resp = $snmp->get_request( -varbindlist=>[ "$VMOID.1.2.0" ] );
	if(!$resp) {
		if(readagent) {
			$MSG = "Error: No VMWare SNMP sub-agent running (vmware-snmpd)"
				if(!$MSG);
			$STATUS = $UNKNOWN;
			dooutput; # exit
			exit(0);
		}
		if(!$stats{'has-names'}) {
			$MSG = "Error: No VMWare SNMP sub-agent running (vmware-snmpd)";
			$STATUS = $UNKNOWN;
			dooutput; # exit
			exit(0);
		}
		$esx_version = 2;  # just a blind assumption
	} else {
		$esx_version = $resp->{"$VMOID.1.2.0"};
		$esx_version =~ s/\..*//;
	}
}

# Read all the VM IDs from the vmware-snmpd MIB
sub getvmid {
	print "(snmp lookup)\n" if($DEBUG);

makesnmp() if(!$snmp);
	$resp = $snmp->get_table( -baseoid=>"$VMOID.2.1.1");
	if(!$resp) {
		$resp = $snmp->get_request( -varbindlist=>[ "$VMOID.1.1.0" ] );
		if(!$resp) {
			if(readagent) {
				$MSG = "Error: No VMWare SNMP sub-agent running (vmware-snmpd)"
					if(!$MSG);
				$STATUS = $UNKNOWN;
				dooutput; # exit
				exit(0);
			}
			if(!$stats{'has-names'}) {
				$MSG = "Error: No VMWare SNMP sub-agent running (vmware-snmpd)";
				$STATUS = $UNKNOWN;
				dooutput; # exit
				exit(0);
			}
			foreach ( keys %stats ) {
				if( /vhost-(\d+)-name/ ) {
					$lookup{$1} = $stats{$_}; # id->name
					$lookup{$stats{$_}} = "vmno-$1" ; # name->dummyOID
					$lookup{"vmno-$1"} = $1 ; # dummyOID->id
				}
			}
		} else {
			print "No guests are defined on this server\n" if($DEBUG);
			$MSG = "No guests defined on this server";
			return;
		}
	} else {
		foreach my $oid ( keys %$resp ) {
			$oid =~ /(\d+)\.(\d+)$/;
			if( $1 == 2 ) {
				$lookup{$resp->{$oid}} = $2;
				$lookup{$2} = $resp->{"$VMOID.2.1.1.7.$2"};
				$lookup{$resp->{"$VMOID.2.1.1.7.$2"}} = $resp->{$oid};
				if ( $esx_version == 3 ) {
					$lookup{"vmGuestState-$2"} = $resp->{"$VMOID.2.1.1.8.$2"};
				}
#		} elsif( $1 == 7 ) {
#			$lookup{$2} = $resp->{$oid};
			}
		}
	}
	return if(!$vhost); # we're just getting the table
	if(defined $lookup{$vhost}) {
		$VMNO = $lookup{$vhost};
		if( defined $lookup{$VMNO} ) {
			$VMID = $lookup{$VMNO};
			if ( defined $lookup{"vmGuestState-$VMNO"} ) {
				$vmGuestState = $lookup{"vmGuestState-$VMNO"};
			}
		} else {
			$STATUS = $CRITICAL;
			$MSG = "Virtual host $vhost($VMNO) is not running!";
		}
	} else {
		# lets see if they just gave part of the vhost name?
		foreach ( keys %lookup ) {
			if( /^$vhost/i ) {
				$VMNO = $lookup{$_};
				if( defined $lookup{$VMNO} ) {
					$VMID = $lookup{$VMNO};
					if ( defined $lookup{"vmGuestState-$VMNO"} ) {
						$vmGuestState = $lookup{"vmGuestState-$VMNO"};
					}
					$vhost = $_;
				} else {
					$STATUS = $CRITICAL;
					$MSG = "Virtual host $vhost($VMNO) is not running!";
				}
				last;
			}
		}
		if($VMNO<0) {
			$STATUS = $UNKNOWN;
			$MSG = "Virtual host $vhost is not defined!";
			dooutput; # exit
			exit(0);
		}
	}

print "(hostno=$VMNO, ID=$VMID)\n" if($DEBUG);
}

sub listvm {
	my(@vh);
	%lookup = (); @vh = ();
	print "(snmp lookup)\n" if($DEBUG);
	makesnmp() if(!$snmp);
	$resp = $snmp->get_table( -baseoid=>"$VMOID.2.1.1");
	if(!$resp) {
		$resp = $snmp->get_request( -varbindlist=>[ "$VMOID.1.1.0" ] );
		if(!$resp) {
			if(readagent) {
				$A = $B = 'U';
				$MSG = "Error: No VMWare SNMP sub-agent running (vmware-snmpd)"
					if(!$MSG);
				$STATUS = $UNKNOWN;
				dooutput; # exit
				exit(0);
			}
			if(!$stats{'has-names'}) {
				$MSG = "Error: No VMWare SNMP sub-agent running (vmware-snmpd)";
				$STATUS = $UNKNOWN;
				dooutput; # exit
				exit(0);
			}
			foreach ( keys %stats ) {
				if( /vhost-(\d+)-name/ ) {
					$lookup{$1} = $stats{$_}; # id->name
					$lookup{$stats{$_}} = "vmno-$1" ; # name->dummyOID
					$lookup{"vmno-$1"} = $1 ; # dummyOID->id
					push @vh,$stats{$_};
				}
			}
		} else {
			$A = $B = 0;
			$MSG = "No VHosts are defined on this server";
			$STATUS = $OK;
			dooutput; # exit
			exit(0);
		}
	} else {
		foreach my $oid ( sort keys %$resp ) {
			$oid =~ /(\d+)\.(\d+)$/;
			if( $1 == 2 ) {
				$lookup{$resp->{$oid}} = $2;
				push @vh, $resp->{$oid};
			} elsif( $esx_version == 2 && $1 == 7 ) {
				$lookup{$2} = $resp->{$oid};
			} elsif( $esx_version == 3 && $1 == 8 ) {
				$lookup{$2} = $resp->{$oid};
			}
		}
	}
	$A = $B = 0;
	foreach ( @vh ) {
		next if(!$_);
		$B++;
		if ( $esx_version == 2 ) {
			if( defined $lookup{$lookup{$_}} and ($lookup{$lookup{$_}} > 0)) {
				$_ = (substr $_,0,16)."(".$lookup{$lookup{$_}}.")"; $A++;
			} else {
				$_ = (substr $_,0,16)."(DOWN)";
			}
		} else {
			# This logic is for ESX 3.
			if( defined $lookup{$lookup{$_}} and ($lookup{$lookup{$_}} eq "running")) {
				$_ = $_."(UP)"; $A++;
			} else {
				# We don't want to truncate the vhostnames because the substrings might not be unique.
				$_ = $_."(DOWN)";
			}
		}
		$_ =~ s/ *$[^$]+\)($.*$)/$1/;
	}
	$MSG = "VHosts: $A/$B up: ".(join ", ",@vh);
	push @perf, "allvms_up_ct=$A;;;0;$B";
	push @perf, "allvms_up_pc=". int($A/$B*10000)/100.0 ."%;;;0;100";
	$STATUS = $OK;
}

sub readnet {
	my($found);

$resp = $snmp->get_table( -baseoid=>"$VMOID.3.4.1");
	if(!$resp) {
		$resp = $snmp->get_request( -varbindlist=>[ "$VMOID.1.1" ] );
		if($resp) { $A = $B = 0;
			$MSG = "No VHosts defined"; $STATUS = $OK; return; }
		$MSG = "Error: Unable to retrieve SNMP data";
		$STATUS = $UNKNOWN;
		return;
	}
	foreach my $oid ( keys %$resp ) {
		$oid =~ /(\d+)\.(\d+)$/; # Type, index.
		if( $1 == 3 ) {
			$tmpnet{$2} = [
				$resp->{$oid},
				$resp->{"$VMOID.3.4.1.2.$2"},
				($resp->{"$VMOID.3.4.1.7.$2"}*1024),
				($resp->{"$VMOID.3.4.1.9.$2"}*1024)
			];
		}
	}
	return if($opt_l =~ /LIST/);
	# We now have all the network statistics indexed by card or VMID
	$A = $B = 0; $found = 0;
	foreach ( keys %tmpnet ) {
		if((($VMID<0) or ($VMID == $tmpnet{$_}[0])) # vm matches
			and ((!$opt_i) or ($opt_i eq $tmpnet{$_}[1]))) { # net matches
			$A += $tmpnet{$_}[2];
			$B += $tmpnet{$_}[3];
			$found = 1;
		}
	}
	if(!$found) {
		$MSG = "No network interfaces exist for ";
		$MSG .= "vhost $vhost" if($VMID>-1);
		$MSG .= " and " if($VMID>-1 and $opt_i);
		$MSG .= " interface $opt_i" if ($opt_i);
		$STATUS = $UNKNOWN;
	}
}

###########################################################################
# Read general memory and CPU data from vmware-snmpd
# This is what we do if we can't get the detailed information.
sub readcpu {
	my($k,@k);
	my($t1,$t2,$a1);

$MSG = ""; $A = 0; $B = 0;
	if( !$MODE or $opt_r ) {
		readstate;
		$t1 = $states{"$hostname-CPU-$vhost-time"};
		$a1 = $states{"$hostname-CPU-$vhost"};
		$t2 = time;
	}

@k = ();
	if( $VMID < 0 ) {
		foreach ( keys %lookup ) {
			push @k, "$VMOID.3.1.2.1.3.".$_ if( /^\d+$/ and $_>99);
		}
	} else {
		$k = "$VMOID.3.1.2.1.3.$VMID";
		@k = ( $k );
	}
	foreach $k ( @k ) { print "(retrieving $k)\n" if($DEBUG); }
	$resp = $snmp->get_request( -varbindlist=>\@k );
	if( $resp ) {
		if($VMID<0){
			$A = 0;
			foreach ( keys %$resp ) { $A += $resp->{$_};
				print "$_: ".$resp->{$_}."\n" if($DEBUG); }
		} else {
			$A = $resp->{$k};
		}
		$B = 0;
	} else {
		$A = $B = 'U';
		if($VMID<0){
			$MSG = "Unable to retrieve CPU statistics for ESX server: ".$snmp->error;
		} else {
			$MSG = "Unable to retrieve CPU statistics for $vhost: ".$snmp->error;
		}
		$STATUS = $UNKNOWN;
	}
	if(!$MSG){ # IE, no errors
		$MSG = "CPU has used $A seconds";
		$MSG .= " on $vhost" if($vhost);
		if( !$MODE or $opt_r ) {
			writestate( "$hostname-CPU-$vhost"=>$A, "$hostname-CPU-$vhost-time"=>$t2 )
				if(!$t1 or ($t2-$t1)>30);
			if(!$t1 or !$a1 or ($t1 >= $t2) or ( ($t2-$t1)>1000 ) ) {
				if($vhost) {
					$MSG = "No saved state for $vhost CPU time yet - wait for next poll.";
				} else {
					$MSG = "No saved state for ESX system CPU time yet - wait for next poll.";
				}
				$A = $B = "U";
				$STATUS = $UNKNOWN;
			} else {
				print "Usage: $A-$a1 in $t2-$t1 = ".($A-$a1)." in ".($t2-$t1) if($DEBUG);
				$A = int((($A - $a1)/($t2 - $t1))*10000)/100;
				print " = $A\n" if($DEBUG);
				$B = 0;
				$MSG = "CPU usage is $A% ";
				$MSG .= "on $vhost" if($vhost);
				$MSG .= " (".($t2-$t1)."s average)";
				if($A>110 or $A<0) {
					$B = $A = 0;
					$MSG = "Error reading CPU usage information."
				}
			}
		}
	}
}

sub readmem {
	my($k1,$k2);

if($VMID < 0) {
		$k1 = "$VMOID.3.2.1.0"; # Total physical present
		$k2 = "$VMOID.3.2.3.0"; # Memory free
	} else {
		$k1 = "$VMOID.3.2.4.1.3.$VMID"; # VM memory max
		$k2 = "$VMOID.3.2.4.1.4.$VMID"; # VM memory used
	}
	print "(retrieving $k1,$k2)\n" if($DEBUG);
	$resp = $snmp->get_request( -varbindlist=>[$k1,$k2] );
	if( $resp ) {
		if($VMID < 0 ) {
			$A = $resp->{$k2}; $B = $resp->{$k1};
		} else {
			$A = $resp->{$k2}; $B = $resp->{$k1}*1024;
			$A = $B - $A; # memory remaining
		}
	} else {
		$A = $B = 'U';
		if($VMID<0) {
			$MSG = "Unable to retrieve memory statistics for ESX server: ".$snmp->error;
		} else {
			$MSG = "Unable to retrieve memory statistics for $vhost: ".$snmp->error;
		}
		$STATUS = $UNKNOWN;
	}
}
sub readconsolemempc {
	my($k1,$k2);

$k1 = "$VMOID.3.2.1.0"; #   Total physical present (enterprises.vmware.vmwResources.vmwMemory.memSize.0)
	$k2 = "$VMOID.3.2.2.0"; #   Memory used by console (enterprises.vmware.vmwResources.vmwMemory.memCOS.0)
	print "(retrieving $k1,$k2)\n" if($DEBUG);
	$resp = $snmp->get_request( -varbindlist=>[$k1,$k2] );
	if( $resp ) {
		return int( $resp->{$k2} / $resp->{$k1} * 10000) / 100.0;
	} else {
		return 'U';
	}
}

sub readxcpu {
	my($k,$C);
	$MSG = ""; $A = 0; $B = 0; $STATUS = 0;
	if( readagent ) {
		print "(readagent failed: $MSG)\n" if($DEBUG);
		readcpu if(!$MSG); # no vmware agent, no error
		return;
	}
	if($vhost) {
		if ( $esx_version <= 2 ) {
			$k = "vhost-$VMID";
		} else {
			foreach my $key ( keys %stats ) {
				if ( $stats{$key} eq $lookup{$lookup{$VMNO}} ) {
					$key =~ /vhost-(\d+)-name/;
					$k = "vhost-$1";
					last;
				}
			}
		}
		if ( defined $k ) {
			$A = $stats{"$k-cpu-used-pc"};
			$B = $stats{"$k-cpu-ready-pc"};
		} else {
			$A = undef;
			$B = undef;
		}
		$C = $A;
	} else {
		$k = "sys";
		$A = $stats{"sys-cpu-used-pc"};
		$B = $stats{"allvms-cpu-used-pc"};
		$C = $A + $B if(defined $A and defined $B);
	}
	if(!defined $A or !defined $B) {
		$A=$B='U'; $MSG="Gathering statistics, please wait.";
		$STATUS = 3;
		# Fill in some dummy performance data anyway, to keep downstream processes somewhat happy.
		if ($vhost) {
			push @perf, "vhost_cpu_used_pc=U%;;;0;100";
			push @perf, "vhost_cpu_ready_pc=U%;;;0;100";
		} else {
			push @perf, "sys_cpu_used_pc=U%;;;0;100";
			push @perf, "allvms_cpu_used_pc=U%;;;0;100";
			push @perf, "sys_cpu_ready_pc=U%;;;0;100";
		}
		dooutput; exit 3;
	}

if($vhost) {
		$MSG = "vhost CPU used=$A% ready=$B%";
		push @perf, "vhost_cpu_used_pc=$A%;;;0;100";
		push @perf, "vhost_cpu_ready_pc=$B%;;;0;100";
	} else {
		$MSG = "CPU used sys=$A% vhosts=$B% readytime=".$stats{'sys-cpu-ready-pc'}."%";
		push @perf, "sys_cpu_used_pc=$A%;;;0;100";
		push @perf, "allvms_cpu_used_pc=$B%;;;0;100";
		push @perf, "sys_cpu_ready_pc=".$stats{'sys-cpu-ready-pc'}."%;;;0;100";
	}

# MRTG only
	if($MODE) { dooutput; exit 0; }
	# Nagios only
	$crit =~ s/[^\d\.]//g; $warn =~ s/[^\d\.]//g;
	$crit = 100 if(!$crit); $warn = 100 if(!$warn);
	if( $C >= $crit ) {
		$MSG .= " " if($MSG);
		$MSG .= "CPU usage is CRITICAL ($C%)";
		$STATUS = 2;
	} elsif( $C >= $warn ) {
		$MSG .= " " if($MSG);
		$MSG .= "CPU usage is WARNING ($C%)";
		$STATUS = 1 if($STATUS<2);
	}

# Ready time
	if( $stats{"$k-cpu-ready-pc"} >= $rcrit ) {
		$MSG .= " " if($MSG);
		$MSG .= "Ready time is CRITICAL (".$stats{"$k-cpu-ready-pc"}."%)";
		$STATUS = 2;
	} elsif( $stats{"$k-cpu-ready-pc"} >= $rwarn ) {
		$MSG .= " " if($MSG);
		$MSG .= "Ready time is WARNING (".$stats{"$k-cpu-ready-pc"}."%)";
		$STATUS = 1 if($STATUS<2);
	}
	if(!$vhost) { # check all vhosts
		foreach ( keys %lookup ) {
			next if(!defined $stats{"vhost-$_-cpu-used-pc"});
			$C=$stats{"vhost-$_-cpu-used-pc"};
			if( $C >= $crit ) {
				$MSG .= " " if($MSG);
				$MSG .= "'".base($lookup{$_})."' CPU CRITICAL ($C%)";
				$STATUS = 2;
			} elsif( $C >= $warn ) {
				$MSG .= " " if($MSG);
				$MSG .= "'".base($lookup{$_})."' CPU WARNING ($C%)";
				$STATUS = 1 if($STATUS<2);
			}
			if( $stats{"vhost-$_-cpu-ready-pc"} >= $rcrit ) {
				$MSG .= " " if($MSG);
				$MSG .= "'".base($lookup{$_})."' Ready time CRITICAL (".$stats{"vhost-$_-cpu-ready-pc"}."%)";
				$STATUS = 2;
			} elsif( $stats{"vhost-$_-cpu-ready-pc"} >= $rwarn ) {
				$MSG .= " " if($MSG);
				$MSG .= "'".base($lookup{$_})."' Ready time WARNING (".$stats{"vhost-$_-cpu-ready-pc"}."%)";
				$STATUS = 1 if($STATUS<2);
			}
		}
	}
	dooutput;
	exit 3; # not reached
}
sub readxmem {
	my($pc,$max,$k,$memVMID);

$MSG = ""; $A = 0; $B = 0;
	if( readagent() ) {
		print "(readagent failed: $MSG)\n" if($DEBUG);
		readmem if(!$MSG); # no vmware agent, no error
		return;
	}

if( $vhost ) {
		if ( $esx_version <= 2 ) {
			$k = "vhost-$VMID";
		} else {
			# for ESX Version 3
			foreach my $key ( keys %stats ) {
				if ( $stats{$key} eq $lookup{$lookup{$VMNO}} ) {
					$key =~ /vhost-(\d+)-name/;
					$memVMID = $1 - 1;	# why this is off by one, we don't know, but it is
					$k = "unknown-$memVMID";
					last;
				}
			}
		}
		$A = $stats{"$k-mem-active"};
		$B = $stats{"$k-mem-max"};
		$max = $stats{"$k-mem-max"};
		if(!defined $A or !defined $B) { $A=$B='U';
			$MSG="Please wait, data being gathered."; $STATUS=3;
			push @perf, "vhost_mem_act_pc=U%;;;0;100";
			push @perf, "vhost_mem_pvt_pc=U%;;;0;100";
			push @perf, "vhost_mem_shr_pc=U%;;;0;100";
			push @perf, "vhost_mem_bal_pc=U%;;;0;100";
			push @perf, "vhost_mem_swp_pc=U%;;;0;100";
			dooutput; exit 0;
		}
		$pc = int($A/$B*10000)/100.0;
		$MSG = "Memory active: ".int($A/1024000)."Mb ($pc%) [Total available ".int($B/1024000)."Mb]";
		push @perf, "vhost_mem_act_pc=$pc%;;;0;100";
		if($pc>=$crit) { $STATUS=2; $MSG = "CRIT: $MSG"; }
		elsif($pc>=$warn) { $STATUS=1; $MSG = "WARN: $MSG"; }
	} else {
		$k = "allvms";
		$A = $stats{'mem-free'};
		$B = $stats{'mem-total'};
		$max = $stats{"$k-mem-max"};
		if(!defined $A or !defined $B) { $A=$B='U';
			$MSG="Please wait, data being gathered."; $STATUS=3;
			push @perf, "mem_free_pc=U\%;;;0;100";
			if ( $esx_version == 3 ) {
				push @perf, "console_mem_pc=U\%;;;0;100";
			}
			push @perf, "allvms_mem_pvt_pc=U\%;;;0;100";
			push @perf, "allvms_mem_shr_pc=U\%;;;0;100";
			push @perf, "allvms_mem_bal_pc=U\%;;;0;100";
			push @perf, "allvms_mem_swp_pc=U\%;;;0;100";
			dooutput; exit 0;
		}
		$pc = int($A/$B*10000)/100.0;
		$MSG = "Memory free: ".int($A/1024000)."Mb ($pc\%) [Total available ".int($B/1024000)."Mb]";
		push @perf, "mem_free_pc=$pc\%;;;0;100";
		if ( $esx_version == 3 ) {
			my ($consolemempc) = readconsolemempc;
			$MSG .= " [Console=$consolemempc\%]";
			push @perf, "console_mem_pc=" . $consolemempc . "\%;;;0;100";
		}
		if($pc<=$crit) { $STATUS=2; $MSG = "CRIT: $MSG"; }
		elsif($pc<=$warn) { $STATUS=1; $MSG = "WARN: $MSG"; }
	}

# MRTG
	if($MODE) { dooutput; exit 0; }

# Nagios
	if($max) {
		$MSG .= " Memory split: pvt/shr/bal/swp = "
			.(int(10000*$stats{"$k-mem-private"}/$max)/100.0)."%/"
			.(int(10000*$stats{"$k-mem-shared"}/$max)/100.0)."%/"
			.(int(10000*$stats{"$k-mem-balloon"}/$max)/100.0)."%/"
			.(int(10000*$stats{"$k-mem-swap"}/$max)/100.0)."%";
		if ($vhost) {
			push @perf, "vhost_mem_pvt_pc=" . (int(10000*$stats{"$k-mem-private"}/$max)/100.0) . "%;;;0;100";
			push @perf, "vhost_mem_shr_pc=" . (int(10000*$stats{"$k-mem-shared" }/$max)/100.0) . "%;;;0;100";
			push @perf, "vhost_mem_bal_pc=" . (int(10000*$stats{"$k-mem-balloon"}/$max)/100.0) . "%;;;0;100";
			push @perf, "vhost_mem_swp_pc=" . (int(10000*$stats{"$k-mem-swap" }/$max)/100.0) . "%;;;0;100";
		} else {
			push @perf, "allvms_mem_pvt_pc=" . (int(10000*$stats{"$k-mem-private"}/$max)/100.0) . "%;;;0;100";
			push @perf, "allvms_mem_shr_pc=" . (int(10000*$stats{"$k-mem-shared" }/$max)/100.0) . "%;;;0;100";
			push @perf, "allvms_mem_bal_pc=" . (int(10000*$stats{"$k-mem-balloon"}/$max)/100.0) . "%;;;0;100";
			push @perf, "allvms_mem_swp_pc=" . (int(10000*$stats{"$k-mem-swap" }/$max)/100.0) . "%;;;0;100";
		}

if($stats{"$k-mem-balloon"}) {
			$pc = int(100000*$stats{"$k-mem-balloon"}/$max)/1000.0;
			if($pc>=25) {
				$MSG .= " CRIT: Balloon drivers in action! ($pc%)";
				$STATUS = 2;
			} elsif($pc>=0.01) {
				$MSG .= " WARN: Balloon drivers in action! ($pc%)";
				$STATUS = 1 if($STATUS<2);
			}
		}
	}
	if($stats{"$k-swap-in-bps"} and $stats{"$k-swap-in-bps"}>10) {
		if($stats{"$k-swap-in-bps"}>$SWAPINCRIT) {
			$MSG .= " CRIT: VMware swapping in action! (".$stats{"$k-swap-in-bps"}."Bps)";
			$STATUS = 2;
		} else {
			$MSG .= " WARN: VMware swapping is starting!";
			$STATUS = 1 if($STATUS<2);
		}
	} elsif($max and $stats{"$k-mem-swap"}) {
		$pc = int(100000*$stats{"$k-mem-swap"}/$max)/1000.0;
		if($pc>=$SWAPPCCRIT) {
			$MSG .= " CRIT: VMWare swap space in use! ($pc%)";
			$STATUS = 2;
		} elsif($pc>=0.01) {
			$MSG .= " WARN: VMWare swap space in use! ($pc%)";
			$STATUS = 1 if($STATUS<2);
		}
	}

dooutput;
	exit 3; # not reached
}

###########################################################################
getopts('hrdNMVH:c:t:v:w:C:l:i:R:');
$hostname = $opt_H if($opt_H);
$vhost = $opt_v if($opt_v);
$warn = $opt_w if($opt_w);
$crit = $opt_c if($opt_c);
$TIMEOUT = $opt_t if($opt_t);
$RETRIES = $opt_R if($opt_R);
$MODE = 1 if($opt_M);
$community = $opt_C if($opt_C);
$DEBUG = 1 if($opt_d);
dohelp if($opt_h);

if ($opt_V) {
	$MSG = "$0 $Version";
	dooutput;
	exit 0;
}

if(!$hostname) {
	$MSG = "No ESX server hostname specified with -H";
	dooutput;
	exit 0;
}
if( !$opt_l ) {
#	$MSG = "You need to specify a command with -l";
#	dooutput;
#	exit 0;
	$opt_l = "LIST";
}
getesxversion;
if( $opt_l =~ /LISTNET/i ) {
	getvmid;
	$MSG = "";
	readnet;
	if(!$MSG) {
		my($tk);
		foreach ( keys %tmpnet ) {
			if(!$vhost or ($VMID eq $tmpnet{$_}[0]) ) {
				$tk=$tmpnet{$_}[1];
				next if($MSG=~/$tk/);
				$MSG .= ', ' if($MSG);
#				$MSG .= $lookup{$tmpnet{$_}[0]}."/" if(!$opt_v);
				$MSG .= $tk;
			}
		}
		$STATUS = $OK;
	}
	dooutput;
	exit 0;
}
if( $opt_l =~ /LIST/i ) {
	listvm;
	if($warn =~ /(\d+)%/) {
		$warn = $B * $1 / 100;
	} elsif( $warn < 0 ) { $warn = $B - 1; }
	if($crit =~ /(\d+)%/) {
		$crit = $B * $1 / 100;
	} elsif( $crit < 0 ) { $crit = 0; }
	$STATUS = $WARNING if($A<=$warn); # If SOME are down
	$STATUS = $CRITICAL if($A<=$crit); # If NONE are up
	$STATUS = $OK if(!$B); # No guests at all
	dooutput;
	exit 3;
}
if( $opt_l !~ /NET|CPU|MEM|STAT/i ) {
	$MSG = "Bad command $opt_l!";
	dooutput;
	exit 3;
}
if( $opt_l =~ /MEM|CPU|NET/ and !$MODE and ($crit<0 or $warn<0)) {
	$MSG = "Invalid warn/critical thresholds for '$opt_l' (need -w and -c)";
	dooutput;
	exit 3;
}

# Now, we have host, vhost, community, and command
getvmid; # also opens SNMP object
if( $opt_l =~ /STAT/i ) {
	if(!$vhost) {
		$MSG = "No virtual hostname specified with -v";
		dooutput;
		exit 0;
	}
	if( ( $esx_version == 2 && $VMID < 0 ) || ( $esx_version == 3 && $vmGuestState ne "running" ) ) {
		$STATUS = $CRITICAL; ($A,$B) = (0,0);
		$MSG = "VHost $vhost is down or undefined.";
	} else {
		$STATUS = $OK; ($A,$B) = (1,1);
		$MSG = "VHost $vhost is up (ID: $VMID)";
	}
	push @perf, "vhost_up=$A;;;0;1";
	dooutput;
	exit 0;
}
if($vhost and ( $esx_version == 2 && $VMID < 0 || $esx_version == 3 && $vmGuestState ne "running" )) {
	$STATUS = $CRITICAL;
	$MSG = "$vhost is not running." if(!$MSG);
	if( $opt_l =~ /CPU/i ) {
		# Fill in some dummy performance data anyway, to keep downstream processes happy.
		push @perf, "vhost_cpu_used_pc=U%;;;0;100";
		push @perf, "vhost_cpu_ready_pc=U%;;;0;100";
	}
	if( $opt_l =~ /MEM/i ) {
		# Fill in some dummy performance data anyway, to keep downstream processes happy.
		push @perf, "vhost_mem_act_pc=U%;;;0;100";
		push @perf, "vhost_mem_pvt_pc=U%;;;0;100";
		push @perf, "vhost_mem_shr_pc=U%;;;0;100";
		push @perf, "vhost_mem_bal_pc=U%;;;0;100";
		push @perf, "vhost_mem_swp_pc=U%;;;0;100";
	}
	if( $opt_l =~ /NET/i ) {
		# Fill in some dummy performance data anyway, to keep downstream processes happy.
		push @perf, "vhost_net_read=U;;;0";
		push @perf, "vhost_net_write=U;;;0";
	}
	dooutput;
	exit 0;
}

$STATUS = $OK;
if( $opt_l =~ /CPU/i ) {
	$MSG = "";
	readxcpu; # attempt to use extended MIB, else use VMWare MIB
} elsif( $opt_l =~ /NET/i ) {
	my($t1,$t2,$a1,$b1);
	$opt_i = "" if(!defined $opt_i);
	$vhost = "" if(!defined $vhost);
	if( !$MODE or $opt_r ) {
		readstate;
		$t1 = $states{"$hostname-NET-$vhost-$opt_i-time"};
		$a1 = $states{"$hostname-NET-$vhost-$opt_i-r"};
		$b1 = $states{"$hostname-NET-$vhost-$opt_i-w"};
		$t2 = time;
	}
	$MSG = "";
	readnet;
	if(!$MSG){ # IE, no errors
		$MSG = "Network counters Read=$A Write=$B";
		$MSG .= " on $vhost" if($vhost);
		if( $opt_i ) {
			if( $vhost ) { $MSG .= '/'; } else { $MSG .= ' on '; }
			$MSG .= $opt_i;
		}
		if( !$MODE or $opt_r ) {
			writestate( "$hostname-NET-$vhost-$opt_i-r"=>$A,
				"$hostname-NET-$vhost-$opt_i-w"=>$B,
				"$hostname-NET-$vhost-$opt_i-time"=>$t2 )
				if(!$t1 or ($t2-$t1)>30);
			if(!$t1 or (!$a1 and !$b1) or ($t1 >= $t2) or (($t2 - $t1)>3600)) {
				$MSG = "No saved state available yet - wait for next poll.";
				$A = $B = "U";
				$STATUS = $UNKNOWN;
				if ($vhost) {
					push @perf, "vhost_net_read=U;;;0";
					push @perf, "vhost_net_write=U;;;0";
				} else {
					push @perf, "allvms_net_read=U;;;0";
					push @perf, "allvms_net_write=U;;;0";
				}
			} else {
				$A = ($A - $a1)/($t2 - $t1);
				$B = ($B - $b1)/($t2 - $t1);
				($fa,$sa,$fb,$sb) = ( $A, "", $B, "" );
				# NOTE:  This arithmetic is really misleading,
				# though we haven't fixed it in this iteration of revisions.
				# M should be either 1024*1024 or 1000*1000, not 1024*1000.
				# And since K is 1024 here, M should be 1024*1024 for consistency.
				if($fa >= 1024000) { $fa /= 1024000; $sa = 'M'; }
				elsif($fa >= 1024) { $fa /= 1024; $sa = 'K'; }
				if($fb >= 1024000) { $fb /= 1024000; $sb = 'M'; }
				elsif($fb >= 1024) { $fb /= 1024; $sb = 'K'; }
				$fa = int($fa * 100)/100; $fb = int($fb * 100)/100;
				$MSG = "Network traffic $fa ".$sa."B/s read, $fb ".$sb."B/s write ";
				$MSG .= "on $vhost" if($vhost);
				if( $opt_i ) {
					if( $vhost ) { $MSG .= '/'; } else { $MSG .= 'on '; }
					$MSG .= $opt_i;
				}
				$MSG .= " (".($t2-$t1)."s average)";
				if ($vhost) {
					push @perf, "vhost_net_read="  . (int(100*$A)/100.0) . ";;;0";
					push @perf, "vhost_net_write=" . (int(100*$B)/100.0) . ";;;0";
				} else {
					push @perf, "allvms_net_read="  . (int(100*$A)/100.0) . ";;;0";
					push @perf, "allvms_net_write=" . (int(100*$B)/100.0) . ";;;0";
				}
			}
		}
	}
} elsif( $opt_l =~ /MEM/i ) {
	my($pc,$tot,$av,$sfx);
	$MSG = "";
	readxmem;
	if(!$MSG) {
		$pc = int($A/$B*10000.0)/100.0;
		$sfx = "Kb"; $av = $A;
		if($av>2047) { $av = int($av/10.24)/100.0; $sfx="Mb"; }
		$av .= $sfx;
		$sfx = "Kb"; $tot = $B;
		if($tot>2047) { $tot = int($tot/10.24)/100.0; $sfx="Mb"; }
		$tot .= $sfx;
		$MSG = "Memory free: $av ($pc\%) [Total available $tot]" ;
		$MSG .= " on vhost $vhost" if($vhost);
	}
} else {
	$MSG = "Invalid command $opt_l";
	$STATUS = $UNKNOWN;
}

if( !$MODE and $STATUS==$OK ) {
	# Set Nagios thresholds
	if( $opt_l=~/MEM/i and $warn =~ /([\d\.]+)%/ ) { $warn = $B * $1 / 100.0; }
	elsif( $warn =~ /([\d\.]+)M/i ) { $warn = $1 * 1024; }
	elsif( $warn =~ /([\d\.]+)/i ) { $warn = $1; }
	if( $opt_l=~/MEM/i and $crit =~ /([\d\.]+)%/ ) { $crit = $B * $1 / 100.0; }
	elsif( $crit =~ /([\d\.]+)M/i ) { $crit = $1 * 1024; }
	elsif( $crit =~ /([\d\.]+)/i ) { $crit = $1; }
	if( $opt_l =~ /MEM/i ) {
		$STATUS = $WARNING if( $A <= $warn );
		$STATUS = $CRITICAL if( $A <= $crit );
	} elsif( $opt_l =~ /CPU/i ) {
		$STATUS = $WARNING if( ($A+$B) >= $warn );
		$STATUS = $CRITICAL if( ($A+$B) >= $crit );
	} elsif( $opt_l =~ /NET/i ) {
		$STATUS = $WARNING if( $A >= $warn );
		$STATUS = $WARNING if( $B >= $warn );
		$STATUS = $CRITICAL if( $A >= $crit );
		$STATUS = $CRITICAL if( $B >= $crit );
	} else {
		$STATUS = $WARNING if( $A <= $warn );
		$STATUS = $CRITICAL if( $A <= $crit );
	}
}

$snmp->close;
dooutput;
exit 0;