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

Inherits:
Types::Fields show all
Defined in:
lib/packetgen/header/ip/addr.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

Instance Method Summary collapse

Methods inherited from Types::Fields

#[], #[]=, #bits_on, define_bit_fields_on, define_field, define_field_after, define_field_before, #fields, fields, inherited, #initialize, #inspect, #offset_of, #optional?, #optional_fields, #present?, #read, remove_bit_fields_on, remove_field, #sz, #to_h, #to_s, update_field

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/addr.rb', line 16

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/addr.rb', line 19

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/addr.rb', line 22

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/addr.rb', line 25

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/addr.rb', line 32

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

#mcast? ⇒ Boolean

Return true if this address is a multicast one

Returns:

  • (Boolean) 


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# File 'lib/packetgen/header/ip/addr.rb', line 60

def mcast?
  self.a1 >= 224 && self.a1 <= 239
end

#to_human ⇒ String

Addr in human readable form (dotted format)

Returns:

  • (String) 


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# File 'lib/packetgen/header/ip/addr.rb', line 47

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

#to_i ⇒ Integer

Addr as an integer

Returns:

  • (Integer) 


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# File 'lib/packetgen/header/ip/addr.rb', line 53

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