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.
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-structParse a local file and get structure in memory:
data = Ipv6Packet.from_file("path/to/local/file.bin")
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
# 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