# File lib/facter/util/netmask.rb, line 2
 2:     def self.get_netmask
 3:         netmask = nil;
 4:         ipregex = %r{(\d{1,3}\.){3}\d{1,3}}
 5: 
 6:         ops = nil
 7:         case Facter.value(:kernel)
 8:         when 'Linux'
 9:             ops = {
10:                 :ifconfig => '/sbin/ifconfig',
11:                 :regex => %r{\s+ inet\saddr: #{Facter.ipaddress} .*? Mask: (#{ipregex})}x,
12:                 :munge => nil,
13:             }
14:         when 'SunOS'
15:             ops = {
16:                 :ifconfig => '/usr/sbin/ifconfig -a',
17:                 :regex => %r{\s+ inet\s+? #{Facter.ipaddress} \+? mask (\w{8})}x,
18:                 :munge => Proc.new { |mask| mask.scan(/../).collect do |byte| byte.to_i(16) end.join('.') }
19:             }
20:         end
21: 
22:         %x{#{ops[:ifconfig]}}.split(/\n/).collect do |line|
23:             matches = line.match(ops[:regex])
24:             if !matches.nil?
25:                 if ops[:munge].nil?
26:                     netmask = matches[1]
27:                 else
28:                     netmask = ops[:munge].call(matches[1])
29:                 end
30:             end
31:         end
32:         netmask
33:     end