Class: PacketGen::Header::Eth

Inherits:

Base

• Object
• Types::Fields
• Base
• PacketGen::Header::Eth

Defined in:

lib/packetgen/header/eth.rb

Overview

An Ethernet header consists of:

• a destination MAC address (MacAddr),

• a source MAC address (MacAddr),

• a #ethertype (Types::Int16),

• and a body (a Types::String or another Header class).

Create a Ethernet header

# standalone
eth = PacketGen::Header::Eth.new
# in a packet
pkt = PacketGen.gen('Eth')
# access to Ethernet header
pkt.eth   # => PacketGen::Header::Eth

Ethernet attributes

eth.dst = "00:01:02:03:04:05"
eth.src        # => "00:01:01:01:01:01"
eth[:src]      # => PacketGen::Header::Eth::MacAddr
eth.ethertype  # => 16-bit Integer
eth.body = "This is a body"

Author:

• Sylvain Daubert

Defined Under Namespace

Classes: MacAddr

Instance Attribute Summary

• #body ⇒ Types::String, Header::Base
• #dst ⇒ MacAddr

  Destination MAC address.

• #ethertype ⇒ Integer

  16-bit integer to determine payload type.

• #src ⇒ MacAddr

  Source MAC address.

Attributes inherited from Base

#packet

Instance Method Summary

• #to_w(iface) ⇒ void

  send Eth packet on wire.

Methods inherited from Base

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

Methods inherited from Types::Fields

#[], #[]=, 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

#body ⇒ Types::String, Header::Base

Returns:

• (Types::String, Header::Base)

# File 'lib/packetgen/header/eth.rb', line 91

define_field :body, Types::String

#dst ⇒ MacAddr

Returns Destination MAC address.

Returns:

• (MacAddr) —

  Destination MAC address

# File 'lib/packetgen/header/eth.rb', line 82

define_field :dst, MacAddr, default: '00:00:00:00:00:00'

#ethertype ⇒ Integer

Returns 16-bit integer to determine payload type.

Returns:

• (Integer) —

  16-bit integer to determine payload type

# File 'lib/packetgen/header/eth.rb', line 88

define_field :ethertype, Types::Int16, default: 0

#src ⇒ MacAddr

Returns Source MAC address.

Returns:

• (MacAddr) —

  Source MAC address

# File 'lib/packetgen/header/eth.rb', line 85

define_field :src, MacAddr, default: '00:00:00:00:00:00'

Instance Method Details

#to_w(iface) ⇒ void

This method returns an undefined value.

send Eth packet on wire.

Parameters:

• iface (String) —

  interface name

# File 'lib/packetgen/header/eth.rb', line 96

def to_w(iface)
  pcap = PCAPRUB::Pcap.open_live(iface, PCAP_SNAPLEN, PCAP_PROMISC, PCAP_TIMEOUT)
  pcap.inject self.to_s
end