add OptFloat datastore option

lib/msf/core/opt_float.rb

@@ -0,0 +1,24 @@
+# -*- coding: binary -*-
+
+module Msf
+  ###
+  #
+  # Float option.
+  #
+  ###
+  class OptFloat < OptBase
+    def type
+      'float'
+    end
+
+    def normalize(value)
+      Float(value) if value.present? && valid?(value)
+    end
+
+    def valid?(value, check_empty: true)
+      return false if check_empty && empty_required_value?(value)
+      Float(value) rescue return false if value.present?
+      super
+    end
+  end
+end

lib/msf/core/option_container.rb

@@ -12,6 +12,7 @@ module Msf
   autoload :OptBool, 'msf/core/opt_bool'
   autoload :OptEnum, 'msf/core/opt_enum'
   autoload :OptInt, 'msf/core/opt_int'
+  autoload :OptFloat, 'msf/core/opt_float'
   autoload :OptPath, 'msf/core/opt_path'
   autoload :OptPort, 'msf/core/opt_port'
   autoload :OptRaw, 'msf/core/opt_raw'
@@ -35,6 +36,7 @@ module Msf
   # * {OptAddress} - IP address or hostname
   # * {OptPath}    - Path name on disk or an Object ID
   # * {OptInt}     - An integer value
+  # * {OptFloat}   - A float value
   # * {OptEnum}    - Select from a set of valid values
   # * {OptAddressRange} - A subnet or range of addresses
   # * {OptRegexp}  - Valid Ruby regular expression

spec/lib/msf/core/opt_float_spec.rb

@@ -0,0 +1,25 @@
+# -*- coding:binary -*-
+
+require 'spec_helper'
+require 'msf/core/option_container'
+
+RSpec.describe Msf::OptFloat do
+  valid_values = [
+    { :value => "1",    :normalized => 1.0 },
+    { :value => "1.1",  :normalized => 1.1 },
+    { :value => "0",    :normalized => 0.0 },
+    { :value => "-1",   :normalized => -1.0 },
+    { :value => "01",   :normalized => 1.0 },
+    { :value => "0xff", :normalized => 255.0 },
+  ]
+  invalid_values = [
+    { :value => "0xblah",  },
+    { :value => "-12cat",  },
+    { :value => "covfefe", },
+    { :value => "NaN",     },
+  ]
+
+  it_behaves_like "an option", valid_values, invalid_values, 'float'
+end
+
+