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.
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.
# This is a generated file! Please edit source .ksy file and use kaitai-struct-compiler to rebuild
# type: ignore
import kaitaistruct
from kaitaistruct import ReadWriteKaitaiStruct, KaitaiStream, BytesIO
if getattr(kaitaistruct, 'API_VERSION', (0, 9)) < (0, 11):
raise Exception("Incompatible Kaitai Struct Python API: 0.11 or later is required, but you have %s" % (kaitaistruct.__version__))
class UdpDatagram(ReadWriteKaitaiStruct):
"""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.
"""
def __init__(self, _io=None, _parent=None, _root=None):
super(UdpDatagram, self).__init__(_io)
self._parent = _parent
self._root = _root or self
def _read(self):
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)
self._dirty = False
def _fetch_instances(self):
pass
def _write__seq(self, io=None):
super(UdpDatagram, self)._write__seq(io)
self._io.write_u2be(self.src_port)
self._io.write_u2be(self.dst_port)
self._io.write_u2be(self.length)
self._io.write_u2be(self.checksum)
self._io.write_bytes(self.body)
def _check(self):
if len(self.body) != self.length - 8:
raise kaitaistruct.ConsistencyError(u"body", self.length - 8, len(self.body))
self._dirty = False