Class: PacketGen::Header::IP::Addr

Inherits:
Base show all
Defined in:
lib/packetgen/header/ip.rb

Overview

IP address, as a group of 4 bytes

Author:

  • Sylvain Daubert

Constant Summary collapse

IPV4_ADDR_REGEX = 
/^(\d{1,3})\.(\d{1,3})\.(\d{1,3})\.(\d{1,3})$/

Instance Attribute Summary collapse

Attributes inherited from Base

#packet

Instance Method Summary collapse

Methods inherited from Base

bind_header, #header_id, inherited, #ip_header, known_headers, #parse?, #protocol_name

Methods inherited from Types::Fields

#[], #[]=, #body=, define_bit_fields_on, define_field, define_field_after, define_field_before, #fields, #force_binary, inherited, #initialize, #inspect, #read, #sz, #to_h, #to_s

Constructor Details

This class inherits a constructor from PacketGen::Types::Fields

Instance Attribute Details

#a1 ⇒ Integer

Returns IP address first byte.

Returns:

  • (Integer) —

    IP address first byte



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# File 'lib/packetgen/header/ip.rb', line 68

define_field :a1, Types::Int8

#a2 ⇒ Integer

Returns IP address seconf byte.

Returns:

  • (Integer) —

    IP address seconf byte



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# File 'lib/packetgen/header/ip.rb', line 71

define_field :a2, Types::Int8

#a3 ⇒ Integer

Returns IP address third byte.

Returns:

  • (Integer) —

    IP address third byte



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# File 'lib/packetgen/header/ip.rb', line 74

define_field :a3, Types::Int8

#a4 ⇒ Integer

Returns IP address fourth byte.

Returns:

  • (Integer) —

    IP address fourth byte



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# File 'lib/packetgen/header/ip.rb', line 77

define_field :a4, Types::Int8

Instance Method Details

#from_human(str) ⇒ self

Read a dotted address

Parameters:

  • str (String)

Returns:

  • (self) 


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# File 'lib/packetgen/header/ip.rb', line 84

def from_human(str)
  return self if str.nil?
  m = str.match(IPV4_ADDR_REGEX)
  if m
    self[:a1].read m[1].to_i
    self[:a2].read m[2].to_i
    self[:a3].read m[3].to_i
    self[:a4].read m[4].to_i
  end
  self
end

#to_human ⇒ String

Addr in human readable form (dotted format)

Returns:

  • (String) 


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# File 'lib/packetgen/header/ip.rb', line 98

def to_human
  fields.map { |f| "#{self[f].to_i}" }.join('.')
end

#to_i ⇒ Integer

Addr as an integer

Returns:

  • (Integer) 


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# File 'lib/packetgen/header/ip.rb', line 104

def to_i
  (self.a1 << 24) | (self.a2 << 16) | (self.a3 << 8) |
    self.a4
end