UDP (User Datagram Protocol) datagram: Lua parsing library

UDP is a simple stateless transport layer (AKA OSI layer 4) protocol, one of the core Internet protocols. It provides source and destination ports, basic checksumming, but provides not guarantees of delivery, order of packets, or duplicate delivery.

KS implementation details

License: CC0-1.0

References

This page hosts a formal specification of UDP (User Datagram Protocol) datagram using Kaitai Struct. This specification can be automatically translated into a variety of programming languages to get a parsing library.

Lua source code to parse UDP (User Datagram Protocol) datagram

udp_datagram.lua

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-- This is a generated file! Please edit source .ksy file and use kaitai-struct-compiler to rebuild
--
-- This file is compatible with Lua 5.3

local class = require("class")
require("kaitaistruct")

-- 
-- UDP is a simple stateless transport layer (AKA OSI layer 4)
-- protocol, one of the core Internet protocols. It provides source and
-- destination ports, basic checksumming, but provides not guarantees
-- of delivery, order of packets, or duplicate delivery.
UdpDatagram = class.class(KaitaiStruct)

function UdpDatagram:_init(io, parent, root)
  KaitaiStruct._init(self, io)
  self._parent = parent
  self._root = root or self
  self:_read()
end

function UdpDatagram:_read()
  self.src_port = self._io:read_u2be()
  self.dst_port = self._io:read_u2be()
  self.length = self._io:read_u2be()
  self.checksum = self._io:read_u2be()
  self.body = self._io:read_bytes((self.length - 8))
end