IPv6 network packet: Ruby parsing library

KS implementation details

License: CC0-1.0
Minimal Kaitai Struct required: 0.8

This page hosts a formal specification of IPv6 network packet using Kaitai Struct. This specification can be automatically translated into a variety of programming languages to get a parsing library.

Usage

Runtime library

All parsing code for Ruby generated by Kaitai Struct depends on the Ruby runtime library. You have to install it before you can parse data.

The Ruby runtime library can be installed from RubyGems:

gem install kaitai-struct

Code

Parse a local file and get structure in memory:

data = Ipv6Packet.from_file("path/to/local/file.IPv6 network packet")

Or parse structure from a string of bytes:

bytes = "\x00\x01\x02..."
data = Ipv6Packet.new(Kaitai::Struct::Stream.new(bytes))

After that, one can get various attributes from the structure by invoking getter methods like:

data.version # => get version

Ruby source code to parse IPv6 network packet

ipv6_packet.rb

# This is a generated file! Please edit source .ksy file and use kaitai-struct-compiler to rebuild

require 'kaitai/struct/struct'

unless Gem::Version.new(Kaitai::Struct::VERSION) >= Gem::Version.new('0.9')
  raise "Incompatible Kaitai Struct Ruby API: 0.9 or later is required, but you have #{Kaitai::Struct::VERSION}"
end

class Ipv6Packet < Kaitai::Struct::Struct
  def initialize(_io, _parent = nil, _root = self)
    super(_io, _parent, _root)
    _read
  end

  def _read
    @version = @_io.read_bits_int_be(4)
    @traffic_class = @_io.read_bits_int_be(8)
    @flow_label = @_io.read_bits_int_be(20)
    @_io.align_to_byte
    @payload_length = @_io.read_u2be
    @next_header_type = @_io.read_u1
    @hop_limit = @_io.read_u1
    @src_ipv6_addr = @_io.read_bytes(16)
    @dst_ipv6_addr = @_io.read_bytes(16)
    @next_header = ProtocolBody.new(@_io, next_header_type)
    @rest = @_io.read_bytes_full
    self
  end
  attr_reader :version
  attr_reader :traffic_class
  attr_reader :flow_label
  attr_reader :payload_length
  attr_reader :next_header_type
  attr_reader :hop_limit
  attr_reader :src_ipv6_addr
  attr_reader :dst_ipv6_addr
  attr_reader :next_header
  attr_reader :rest
end