#!/usr/bin/env perl
#
# External STONITH module for VMWare vCenter/ESX
#
# Author:  Nhan Ngo Dinh
# License: GNU General Public License (GPL)
#

require 5.010;

use strict;
use warnings;

sub dielog {
	my $msg = "[";
	$msg .= "$ARGV[0]" if defined($ARGV[0]);
	$msg .= " $ARGV[1]" if defined($ARGV[1]);
	$msg .= "]";
	( $_ ) = @_;
	$msg .= " $_";
	system("ha_log.sh", "err", "$msg");
	die();
}

# Define command groups
my @configCommands = qw{getconfignames getinfo-devid getinfo-devname getinfo-devdescr getinfo-devurl getinfo-xml};
my @actionCommands = qw{reset on off};
my @netCommands = (@actionCommands, qw{status gethosts listvms});

# Process command line arguments
my $command = $ARGV[0] || dielog("No command specified\n");

# Command belongs to the group of commands that do not require any connection to VMware vCenter
if ($command ~~ @configCommands) {
	if ($command eq "getconfignames") {
		print "VI_SERVER\nVI_PORTNUMBER\nVI_PROTOCOL\nVI_SERVICEPATH\nVI_CREDSTORE\nHOSTLIST\nRESETPOWERON\n";
	}
	elsif ($command eq "getinfo-devid") {
		print "VMware vCenter STONITH device\n";
	}
	elsif ($command eq "getinfo-devname") {
		print "VMware vCenter STONITH device\n";
	}
	elsif ($command eq "getinfo-devdescr") {
		print "VMWare vCenter STONITH device\n";
	}
	elsif ($command eq "getinfo-devurl") {
		print "http://www.vmware.com/\n";
	}
	elsif ($command eq "getinfo-xml") {
		print q{<parameters>
<parameter name="HOSTLIST" required="1">
<content type="string"/>
<shortdesc lang="en">List of hosts and virtual machines (required)</shortdesc>
<longdesc lang="en">
The list of hosts that the VMware vCenter STONITH device controls.
Syntax is:
  hostname1[=VirtualMachineName1];hostname2[=VirtualMachineName2]

NOTE: omit =VirtualMachineName if hostname and virtual machine names are identical

Example:
  cluster1=VMCL1;cluster2=VMCL2
</longdesc>
</parameter>
<parameter name="VI_SERVER">
<content type="string" default="localhost"/>
<shortdesc lang="en">VMware vCenter address</shortdesc>
<longdesc lang="en">
The VMware vCenter address
</longdesc>
</parameter>
<parameter name="VI_PROTOCOL">
<content type="string" default="https"/>
<shortdesc lang="en">VMware vCenter protocol</shortdesc>
<longdesc lang="en">
The VMware vCenter protocol
</longdesc>
</parameter>
<parameter name="VI_PORTNUMBER">
<content type="string" default="443"/>
<shortdesc lang="en">VMware vCenter port number</shortdesc>
<longdesc lang="en">
The VMware vCenter port number
</longdesc>
</parameter>
<parameter name="VI_SERVICEPATH">
<content type="string" default="/sdk"/>
<shortdesc lang="en">VMware vCenter service path</shortdesc>
<longdesc lang="en">
The VMware vCenter services path
</longdesc>
</parameter>
<parameter name="VI_CREDSTORE" required="1">
<content type="string"/>
<shortdesc lang="en">VMware vCenter credentials store file</shortdesc>
<longdesc lang="en">
VMware vCenter credentials store file
</longdesc>
</parameter>
<parameter name="RESETPOWERON">
<content type="string" default="1"/>
<shortdesc lang="en">PowerOnVM on reset</shortdesc>
<longdesc lang="en">
Enable/disable a PowerOnVM on reset when the target virtual machine is off
Allowed values: 0, 1
</longdesc>
</parameter>
<parameter name="PERL_LWP_SSL_VERIFY_HOSTNAME">
<content type="string"/>
<shortdesc lang="en">Enable or disable SSL hostname verification</shortdesc>
<longdesc lang="en">
To disable SSL hostname verification set this option to 0.
To enable hostname verification, set this option to 1.
This option is actually part of the LWP Perl library.
See LWP(3pm) for more information.
</longdesc>
</parameter>
</parameters>} . "\n";
	}
	else { dielog("Invalid command specified: $command\n"); }
}

# Command belongs to the group of commands that require connecting to VMware vCenter
elsif ($command ~~ @netCommands) {

	eval { require VMware::VIRuntime; }
	or dielog("Missing perl module VMware::VIRuntime. Download and install 'VMware Infrastructure (VI) Perl Toolkit', available at http://www.vmware.com/support/developer/viperltoolkit/ \n");

	# A valid VI_CREDSTORE is required to avoid interactive prompt
	( exists $ENV{'VI_CREDSTORE'} ) || dielog("VI_CREDSTORE not specified\n");

	# HOSTLIST is mandatory
	exists $ENV{'HOSTLIST'} || dielog("HOSTLIST not specified\n");

	# Parse HOSTLIST to %host_to_vm and %vm_to_host
	my @hostlist = split(';', $ENV{'HOSTLIST'});
	my %host_to_vm = ();
	my %vm_to_host = ();
	foreach my $host (@hostlist) {
		my @config = split(/=/, $host);
		my $key = $config[0]; my $value = $config[1];
		if (!defined($value)) { $value = $config[0]; }
		$host_to_vm{$key} = $value;
		$vm_to_host{(lc $value)} = $key;
	}

	eval {
		# VI API: reads options from the environment variables into appropriate data structures for validation.
		Opts::parse();
		# VI API: ensures that input values from environment variable are complete, consistent and valid.
		Opts::validate();
		# VI API: establishes a session with the VirtualCenter Management Server or ESX Server Web service
		Util::connect();
	};
	if ($@) {
		# This is just a placeholder for any error handling procedure
		dielog($@);
	}

	# Command belongs to the group of commands that performs actions on Virtual Machines
	if ($command ~~ @actionCommands) {

		my $targetHost = $ARGV[1] || dielog("No target specified\n");

		# Require that specified target host exists in the specified HOSTLIST
		if (exists $host_to_vm{$targetHost}) {

			my $vm;
			my $esx;
			eval {
				# VI API: searches the inventory tree for a VirtualMachine managed entity whose name matches
				# the name of the virtual machine assigned to the target host in HOSTLIST
				$vm = Vim::find_entity_view(view_type => "VirtualMachine", filter => { name => qr/^\Q$host_to_vm{$targetHost}\E/i });
				if (!defined $vm) {
					dielog("Machine $targetHost was not found");
 				}

				# VI API: retrieves the properties of the managed object reference runtime.host of the VirtualMachine
				# managed entity obtained by the previous command
				# NOTE: This is essentially a workaround to vSphere Perl SDK
				# to allow pointing to the right HostSystem. This is probably
				# done by changing the current HostSystem in the Web Service
				# session context. WARNING: Do not use the same session for any
				# other concurrent operation.
				$esx = Vim::get_view(mo_ref => $vm->{"runtime"}{"host"})->name;
			};
			if ($@) {
				if (ref($@) eq "SoapFault") { dielog("$@->detail\n"); }
				dielog($@);
			}

			my $powerState = $vm->get_property('runtime.powerState')->val;
			if ($powerState eq "suspended") {
				# This implementation assumes that suspending a cluster node can cause
				# severe failures on shared resources, thus any failover operation should
				# be blocked.
				dielog("Machine $esx:$vm->{'name'} is in a suspended state\n");
			}

			eval {
				if ($command eq "reset") {
					if ($powerState eq "poweredOn") {
						$vm->ResetVM();
						system("ha_log.sh", "info", "Machine $esx:$vm->{'name'} has been reset");
					} else {
						system("ha_log.sh", "warn", "Tried to ResetVM $esx:$vm->{'name'} that was $powerState");
						# Start a virtual machine on reset only if explicitly allowed by RESETPOWERON
						if ($powerState eq "poweredOff" && (! exists $ENV{'RESETPOWERON'} || $ENV{'RESETPOWERON'} ne 0)) {
							$vm->PowerOnVM();
							system("ha_log.sh", "info", "Machine $esx:$vm->{'name'} has been powered on");
						} else {
							dielog("Could not complete $esx:$vm->{'name'} power cycle");
						}
					}
				}
				elsif ($command eq "off") {
					if ($powerState eq "poweredOn") {
						$vm->PowerOffVM();
						system("ha_log.sh", "info", "Machine $esx:$vm->{'name'} has been powered off");
					} else {
						system("ha_log.sh", "warn", "Tried to PowerOffVM $esx:$vm->{'name'} that was $powerState");

					}
				}
				elsif ($command eq "on") {
					if ($powerState eq "poweredOff") {
						$vm->PowerOnVM();
						system("ha_log.sh", "info", "Machine $esx:$vm->{'name'} has been powered on");
					} else {
						system("ha_log.sh", "warn", "Tried to PowerOnVM $esx:$vm->{'name'} that was $powerState");
					}
				}
				else { dielog("Invalid command specified: $command\n"); }
			};
			if ($@) {
				if (ref($@) eq "SoapFault") { dielog("$@->detail\n"); }
				dielog($@);
			}

		} else { dielog("Invalid target specified\n"); }
	} else {
	# Command belongs to the group of commands that lookup the status of VMware vCenter and/or virtual machines
		if ($command eq "status") {
			# we already connect to the vcenter, no need to do
			# anything else in status
			;
		}
		elsif ($command eq "gethosts") {
                        foreach my $key (keys(%host_to_vm)) {
                                print "$key \n";
                        }
		}
		elsif ($command eq "listvms") {
			eval {
				# VI API: Searches the inventory tree for all VirtualMachine managed objects
				my $vms = Vim::find_entity_views(view_type => "VirtualMachine");
				if (defined $vms) {
					printf(STDERR "%-50s    %-20s\n", "VM Name", "Power state");
					print STDERR "-" x 70 . "\n";
					foreach my $vm (@$vms) {
					my $powerState = $vm->get_property('runtime.powerState')->val;
						printf("%-50s    %-20s\n", $vm->{name}, $powerState);
					}
				}
			};
		}
		else { dielog("Invalid command specified: $command\n"); }
	}
	eval {
		Util::disconnect();
	};
	if ($@) {
		# This is just a placeholder for any error handling procedure
		dielog($@);
	}
}
else { dielog("Invalid command specified: $command\n"); }

exit(0);