Server : nginx/1.18.0 System : Linux localhost 6.14.3-x86_64-linode168 #1 SMP PREEMPT_DYNAMIC Mon Apr 21 19:47:55 EDT 2025 x86_64 User : www-data ( 33) PHP Version : 8.0.16 Disable Function : pcntl_alarm,pcntl_fork,pcntl_waitpid,pcntl_wait,pcntl_wifexited,pcntl_wifstopped,pcntl_wifsignaled,pcntl_wifcontinued,pcntl_wexitstatus,pcntl_wtermsig,pcntl_wstopsig,pcntl_signal,pcntl_signal_get_handler,pcntl_signal_dispatch,pcntl_get_last_error,pcntl_strerror,pcntl_sigprocmask,pcntl_sigwaitinfo,pcntl_sigtimedwait,pcntl_exec,pcntl_getpriority,pcntl_setpriority,pcntl_async_signals,pcntl_unshare, Directory :  /lib/python3/dist-packages/twisted/pair/

Upload File : current_dir [ Writeable ] document_root [ Writeable ]

# -*- test-case-name: twisted.pair.test.test_ethernet -*-
# Copyright (c) Twisted Matrix Laboratories.
# See LICENSE for details.

#


"""Support for working directly with ethernet frames"""

import struct


from twisted.internet import protocol
from twisted.pair import raw
from zope.interface import implementer, Interface


class IEthernetProtocol(Interface):
    """An interface for protocols that handle Ethernet frames"""
    def addProto():
        """Add an IRawPacketProtocol protocol"""

    def datagramReceived():
        """An Ethernet frame has been received"""

class EthernetHeader:
    def __init__(self, data):

        (self.dest, self.source, self.proto) \
                    = struct.unpack("!6s6sH", data[:6+6+2])



@implementer(IEthernetProtocol)
class EthernetProtocol(protocol.AbstractDatagramProtocol):
    def __init__(self):
        self.etherProtos = {}

    def addProto(self, num, proto):
        proto = raw.IRawPacketProtocol(proto)
        if num < 0:
            raise TypeError('Added protocol must be positive or zero')
        if num >= 2**16:
            raise TypeError('Added protocol must fit in 16 bits')
        if num not in self.etherProtos:
            self.etherProtos[num] = []
        self.etherProtos[num].append(proto)

    def datagramReceived(self, data, partial=0):
        header = EthernetHeader(data[:14])
        for proto in self.etherProtos.get(header.proto, ()):
            proto.datagramReceived(data=data[14:],
                                   partial=partial,
                                   dest=header.dest,
                                   source=header.source,
                                   protocol=header.proto)