Munin contributed plugins

#!/usr/bin/env ruby

# netstat_bsd_m revision 1 (Feb 2012)

#

# This plugin shows various statistics from 'netstat -m'

#

# Required privileges: none

#

# OS:

# 	Supposed: BSD

# 	Tested:   FreeBSD 8.2

#

# Author: Artem Sheremet <dot.doom@gmail.com>

#

#%# family=auto

#%# capabilities=autoconf suggest

# original filename

PLUGIN_NAME = 'netstat_bsd_m_'

class String

	def escape

		self.gsub /[^\w]/, '_'

	end

	unless method_defined? :start_with?

		def start_with?(str)

			self[0...str.size] == str

		end

	end

end

def netstat_m(filter = nil)

	Hash[`netstat -m`.split($/).map { |line|

		if line =~ /^([\d\/K]+) (.*) \(([\w\/+]+)\)$/

			# 7891K/22385K/30276K bytes allocated to network (current/cache/total)

			values, desc, names = $1, $2, $3

			[desc, names.split('/').zip(values.split '/')] if filter.nil? or desc.escape == filter

		elsif line =~ /^(\d+) (.*)$/

			# 12327 requests for I/O initiated by sendfile

			value, desc = $1, $2

			[desc, [[ :value, value ]]] if filter.nil? or desc.escape == filter

		end

	}.compact]

end

stat_name = File.basename($0, '.*').escape

stat_name.slice! 0, PLUGIN_NAME.size if stat_name.start_with? PLUGIN_NAME

case ARGV.first

when 'autoconf'

	puts `uname -s`.include?('FreeBSD') ? 'yes' : 'no'

when 'suggest'

	puts netstat_m.keys.map(&:escape).join $/

when 'config'

	data = netstat_m(stat_name)

	if data.empty?

		warn "no data for <#{stat_name}>. Try running with 'suggest'"

	else

		desc, values = data.first

		stack = values.size > 1

		first = true

		puts <<CONFIG

graph_title Netstat: #{desc}

graph_category network

graph_vlabel current

graph_order #{values.map { |name, _| name.to_s.escape }.join ' '}

CONFIG

		puts values.map { |name, _|

			esc_name = name.to_s.escape

			"#{esc_name}.draw " + if %w(total max).include? name

				'LINE'

			elsif stack

				if first

					first = false

					'AREA'

				else

					'STACK'

				end

			else

				'LINE2'

			end + "\n#{esc_name}.label #{name}"

		}.join $/

	end

when nil # fetch

	data = netstat_m(stat_name)

	unless data.empty?

		puts data.first.last.map { |name, value|

			value = value.to_i * 1024 if value.end_with? 'K'

			"#{name.to_s.escape}.value #{value}"

		}.join $/

	end

else

	warn "unrecognized argument <#{ARGV.first}>"

end