Source code for dhcpkit.ipv6.server.handlers.server_id

Handlers for the basic :rfc:`3315` options

import logging

from dhcpkit.ipv6.duids import DUID
from dhcpkit.ipv6.options import ServerIdOption
from dhcpkit.ipv6.server.handlers import CannotRespondError
from dhcpkit.ipv6.server.handlers.basic import OverwriteOptionHandler
from dhcpkit.ipv6.server.transaction_bundle import TransactionBundle

logger = logging.getLogger(__name__)

[docs]class ForOtherServerError(CannotRespondError): """ A specific case of being unable to respond: this message is for another server """ pass
[docs]class ServerIdHandler(OverwriteOptionHandler): """ The handler for ServerIdOption. Checks whether any server-id in the request matches our own and puts our server-id in the response message to let the client know who is answering. :type option: ServerIdOption """ option = None def __init__(self, duid: DUID): """ Create a handler function based on the provided DUID :param duid: The DUID of this server """ option = ServerIdOption(duid) option.validate() super().__init__(option, always_send=True)
[docs] def pre(self, bundle: TransactionBundle): """ Check if there is a ServerId in the request :param bundle: The transaction bundle """ server_id = bundle.request.get_option_of_type(ServerIdOption) if server_id and server_id.duid != self.option.duid: # This message is not for this server raise ForOtherServerError