lib/arborist/monitor/snmp/process.rb
author Mahlon E. Smith <mahlon@martini.nu>
Sat, 01 Aug 2020 14:17:45 -0700
changeset 29 40bcd1565627
parent 26 54f2f57cc0b0
permissions -rw-r--r--
Alterations for consistency, add documentation. Version bump.
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# -*- ruby -*-
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# vim: set noet nosta sw=4 ts=4 :
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require 'arborist/monitor/snmp' unless defined?( Arborist::Monitor::SNMP )
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# SNMP running process checks.
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#
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# This only checks running userland processes.
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#
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class Arborist::Monitor::SNMP::Process
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	include Arborist::Monitor::SNMP
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	extend Configurability, Loggability
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	log_to :arborist_snmp
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	# OIDS for discovering running processes.
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	# Of course, Windows does it slightly differently.
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	#
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	PROCESS = {
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		netsnmp: {
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			list: '1.3.6.1.2.1.25.4.2.1.4',
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			args: '1.3.6.1.2.1.25.4.2.1.5'
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		},
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		windows: {
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			list: '1.3.6.1.2.1.25.4.2.1.2',
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			path: '1.3.6.1.2.1.25.4.2.1.4',
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			args: '1.3.6.1.2.1.25.4.2.1.5'
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		}
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	}
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	# Global defaults for instances of this monitor
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	#
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	configurability( 'arborist.snmp.processes' ) do
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		# Default list of processes to check for
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		setting :check, default: [] do |val|
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			Array( val )
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		end
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	end
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	### Return the properties used by this monitor.
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	###
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	def self::node_properties
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		return USED_PROPERTIES
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	end
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	### Class #run creates a new instance and immediately runs it.
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	###
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	def self::run( nodes )
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		return new.run( nodes )
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	end
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	### Perform the monitoring checks.
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	###
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	def run( nodes )
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		super do |host, snmp|
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			self.gather_processlist( host, snmp )
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		end
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	end
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	#########
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	protected
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	#########
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	### Collect running processes on +host+ from an existing (and open)
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	#### +snmp+ connection.
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	###
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	def gather_processlist( host, snmp )
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		config = self.identifiers[ host ].last['config'] || {}
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		errors = []
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		procs  = self.system =~ /windows\s+/i ? self.get_windows( snmp ) : self.get_procs( snmp )
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		self.log.debug "Running processes for host: %s: %p" % [ host, procs ]
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		self.results[ host ] = { count: procs.size }
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		# Check against what is running.
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		#
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		Array( config['check'] || self.class.check ).each do |process|
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			process_r = Regexp.new( process )
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			found = procs.find{|p| p.match(process_r) }
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			errors << "'%s' is not running" % [ process ] unless found
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		end
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		self.results[ host ][ :error ] = errors.join( ', ' ) unless errors.empty?
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	end
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	### Parse OIDS and return an Array of running processes.
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	### Windows specific behaviors.
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	###
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	def get_windows( snmp )
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		oids = [ PROCESS[:windows][:path], PROCESS[:windows][:list], PROCESS[:windows][:args] ]
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		paths = snmp.walk( oid: oids[0] ).each_with_object( [] ) do |(_, value), acc|
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			acc << value
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		end
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		procs = snmp.walk( oid: oids[1] ).each_with_object( [] ) do |(_, value), acc|
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			acc << value
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		end
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		args = snmp.walk( oid: oids[2] ).each_with_object( [] ) do |(_, value), acc|
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			acc << value
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		end
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		return paths.zip( procs, args ).collect do |(path, process, arg)|
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			next unless path && process
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			next if path.empty?
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			path << process unless process.empty?
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			path << " %s" % [ arg.to_s ] if arg && ! arg.empty?
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			path
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		end.compact
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	end
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	### Parse OIDS and return an Array of running processes.
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	###
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	def get_procs( snmp )
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		oids = [ PROCESS[:netsnmp][:list], PROCESS[:netsnmp][:args] ]
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		procs = snmp.walk( oid: oids.first ).each_with_object( [] ) do |(_, value), acc|
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			acc << value
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		end
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		args = snmp.walk( oid: oids.last ).each_with_object( [] ) do |(_, value), acc|
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			acc << value
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		end
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		return procs.zip( args ).collect do |(process, arg)|
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			next if process.empty?
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			process << " %s" % [ arg.to_s ] unless arg.empty?
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			process
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		end.compact
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	end
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end # class Arborist::Monitor::SNMP::Process
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