common: add netmask fact for automatic syncing

plugins/facter/netmask.rb

@@ -0,0 +1,47 @@
+# netmask.rb -- find the netmask of the primary ipaddress
+# Copyright (C) 2007 David Schmitt <david@schmitt.edv-bus.at>
+# Copyright (C) 2007 Mark 'phips' Phillips
+# See LICENSE for the full license granted to you.
+# idea and originial source by Mark 'phips' Phillips
+
+def get_netmask
+	netmask = nil;
+	ipregex = %r{(\d{1,3}\.){3}\d{1,3}}
+
+	ops = nil
+	case Facter.kernel 
+		when 'Linux'
+			ops = {
+				:ifconfig => '/sbin/ifconfig',
+				:regex => %r{\s+ inet\saddr: #{Facter.ipaddress} .*? Mask: (#{ipregex})}x,
+				:munge => nil,
+			}
+		when 'SunOS'
+			ops = {
+				:ifconfig => '/usr/sbin/ifconfig -a',
+				:regex => %r{\s+ inet\s+? #{Facter.ipaddress} \+? mask (\w{8})}x,
+				:munge => Proc.new { |mask| mask.scan(/../).collect do |byte| byte.to_i(16) end.join('.') }
+			}
+	end
+
+	%x{#{ops[:ifconfig]}}.split(/\n/).collect do |line|
+		matches = line.match(ops[:regex])
+		if !matches.nil?
+			if ops[:munge].nil? 
+				netmask = matches[1]
+			else
+				netmask = ops[:munge].call(matches[1])
+			end
+		end
+	end
+	netmask
+end
+
+Facter.add("netmask") do
+	confine :kernel => [ :sunos, :linux ]
+	setcode do
+		get_netmask
+	end
+end
+
+