module Puppet::Parser::Functions newfunction(:validate_ipv4_address, :doc => <<-ENDHEREDOC Validate that all values passed are valid IPv4 addresses. Fail compilation if any value fails this check. The following values will pass: $my_ip = "1.2.3.4" validate_ipv4_address($my_ip) validate_ipv4_address("8.8.8.8", "172.16.0.1", $my_ip) The following values will fail, causing compilation to abort: $some_array = [ 1, true, false, "garbage string", "3ffe:505:2" ] validate_ipv4_address($some_array) ENDHEREDOC ) do |args| require "ipaddr" rescuable_exceptions = [ ArgumentError ] if defined?(IPAddr::InvalidAddressError) rescuable_exceptions << IPAddr::InvalidAddressError end unless args.length > 0 then raise Puppet::ParseError, ("validate_ipv4_address(): wrong number of arguments (#{args.length}; must be > 0)") end args.each do |arg| unless arg.is_a?(String) raise Puppet::ParseError, "#{arg.inspect} is not a string." end begin unless IPAddr.new(arg).ipv4? raise Puppet::ParseError, "#{arg.inspect} is not a valid IPv4 address." end rescue *rescuable_exceptions raise Puppet::ParseError, "#{arg.inspect} is not a valid IPv4 address." end end end end