Class: PacketGen::Plugin::IKE::KE

Inherits:
Payload
  • Object
show all
Defined in:
lib/packetgen/plugin/ike/ke.rb

Overview

This class handles Key Exchange payloads, as defined in RFC 7296 §3.4

A KE payload contains a generic payload Plugin (see Payload) and some specific fields: 1 2 3 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Next Payload |C| RESERVED | Payload Length | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Diffie-Hellman Group Num | RESERVED | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | | ~ Key Exchange Data ~ | | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ These specific fields are:

Create a KE payload

Create a IKE packet with a KE payload

pkt = PacketGen.gen('IP').add('UDP').add('IKE')

group name is taken from Transform::DH_* constants

pkt.add('IKE::KE', group: 'MODP4096')

group number may also be used

pkt.ike_ke.group = 1 pkt.calc_length

Author:

  • Sylvain Daubert

Constant Summary collapse

PAYLOAD_TYPE =

Payload type number

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Instance Attribute Summary collapse

Attributes inherited from Payload

#content, #critical, #flags, #hreserved, #length, #next

Instance Method Summary collapse

Methods inherited from Payload

#calc_length, protocol_name

Constructor Details

#initialize(options = {}) ⇒ KE 



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# File 'lib/packetgen/plugin/ike/ke.rb', line 53

def initialize(options={})
  super
  self.group = options[:group] if options[:group]
end

Instance Attribute Details

#group_num ⇒ Integer

16-bit DH group number



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# File 'lib/packetgen/plugin/ike/ke.rb', line 47

define_attr_before :content, :group_num, BinStruct::Int16

#reserved ⇒ Integer

16-bit reserved field



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# File 'lib/packetgen/plugin/ike/ke.rb', line 51

define_attr_before :content, :reserved, BinStruct::Int16, default: 0

Instance Method Details

#group=(value) ⇒ Integer

Set group

Raises:

  • (ArgumentError) 


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# File 'lib/packetgen/plugin/ike/ke.rb', line 62

def group=(value)
  group = case value
          when Integer
            value
          else
            cname = "DH_#{value}"
            Transform.const_defined?(cname) ? Transform.const_get(cname) : nil
          end
  raise ArgumentError, "unknown group #{value.inspect}" unless group

  self[:group_num].value = group
end