/check_ipv6_autoconf_disabled

#!/usr/bin/env ruby
INTERFACES_BLACKLIST = [ 'tun0', 'tun1', 'tun2' ]
# Jonas Genannt <jonas@brachium-system.net>

def check_ipv6_autoconf(interface_directory)
  accept_ra = File.read(File.join(interface_directory, "accept_ra")).chomp
  autoconf = File.read(File.join(interface_directory, "autoconf")).chomp
  if accept_ra == "0" and autoconf == "0"
    return true
  end
  false
end

interfaces = Hash.new
interfaces[:blacklisted] = Array.new
interfaces[:ok] = Array.new
interfaces[:critical] = Array.new

Dir.glob("/proc/sys/net/ipv6/conf/*").each do |dir|
  interface_name = File.basename(dir)
  next if interface_name =~ /\A(default|all|lo)\Z/
  if INTERFACES_BLACKLIST.include?(interface_name)
    interfaces[:blacklisted] << interface_name
    next
  end
  if check_ipv6_autoconf(dir) == true
    interfaces[:ok] << interface_name
  else
    interfaces[:critical] << interface_name
  end
end

output_backlisted = ""
if interfaces[:blacklisted].count > 0
  output_backlisted = "Int blacklisted: " + interfaces[:blacklisted].join(' ')
end

if interfaces[:critical].count > 0
  puts "CRITICAL: Int IPv6 autoconf enabled: #{interfaces[:critical].join(' ')} Int IPv6 autoconf disabled: #{interfaces[:ok].join(' ')} (#{interfaces[:ok].count}) " + output_backlisted
  exit 2
else
  puts "OK: Int IPv6 autoconf disabled: #{interfaces[:ok].join(' ')} (#{interfaces[:ok].count}) " + output_backlisted
end