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import time |
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import logging |
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from typing import Deque, Optional |
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from collections import deque |
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from asyncua import ua |
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from ..ua.ua_binary import nodeid_from_binary, struct_from_binary, struct_to_binary, uatcp_to_binary |
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from .internal_server import InternalServer, InternalSession |
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from ..common.connection import SecureConnection |
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from ..common.utils import ServiceError |
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_logger = logging.getLogger(__name__) |
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class PublishRequestData: |
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def __init__(self, requesthdr=None, seqhdr=None): |
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self.requesthdr = requesthdr |
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self.seqhdr = seqhdr |
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self.timestamp = time.time() |
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class UaProcessor: |
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""" |
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Processor for OPC UA messages. Implements the OPC UA protocol for the server side. |
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""" |
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def __init__(self, internal_server: InternalServer, transport): |
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self.iserver: InternalServer = internal_server |
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self.name = transport.get_extra_info('peername') |
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self.sockname = transport.get_extra_info('sockname') |
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self.session: Optional[InternalSession] = None |
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self._transport = transport |
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# deque for Publish Requests |
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self._publish_requests: Deque[PublishRequestData] = deque() |
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# used when we need to wait for PublishRequest |
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self._publish_results: Deque[ua.PublishResult] = deque() |
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self._connection = SecureConnection(ua.SecurityPolicy()) |
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def set_policies(self, policies): |
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self._connection.set_policy_factories(policies) |
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def send_response(self, requesthandle, seqhdr, response, msgtype=ua.MessageType.SecureMessage): |
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response.ResponseHeader.RequestHandle = requesthandle |
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data = self._connection.message_to_binary( |
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struct_to_binary(response), message_type=msgtype, request_id=seqhdr.RequestId) |
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self._transport.write(data) |
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def open_secure_channel(self, algohdr, seqhdr, body): |
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request = struct_from_binary(ua.OpenSecureChannelRequest, body) |
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self._connection.select_policy( |
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algohdr.SecurityPolicyURI, algohdr.SenderCertificate, request.Parameters.SecurityMode) |
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channel = self._connection.open(request.Parameters, self.iserver) |
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# send response |
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response = ua.OpenSecureChannelResponse() |
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response.Parameters = channel |
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self.send_response(request.RequestHeader.RequestHandle, seqhdr, response, ua.MessageType.SecureOpen) |
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def forward_publish_response(self, result: ua.PublishResult): |
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""" |
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Try to send a `PublishResponse` with the given `PublishResult`. |
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""" |
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#_logger.info("forward publish response %s", result) |
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while True: |
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if not self._publish_requests: |
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self._publish_results.append(result) |
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_logger.info( |
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"Server wants to send publish answer but no publish request is available," |
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"enqueuing notification, length of result queue is %s", |
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len(self._publish_results) |
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) |
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return |
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# We pop left from the Publish Request deque (FIFO) |
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requestdata = self._publish_requests.popleft() |
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if (requestdata.requesthdr.TimeoutHint == 0 or |
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requestdata.requesthdr.TimeoutHint != 0 and |
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time.time() - requestdata.timestamp < requestdata.requesthdr.TimeoutHint / 1000): |
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# Continue and use `requestdata` only if there was no timeout |
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break |
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response = ua.PublishResponse() |
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response.Parameters = result |
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self.send_response(requestdata.requesthdr.RequestHandle, requestdata.seqhdr, response) |
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async def process(self, header, body): |
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msg = self._connection.receive_from_header_and_body(header, body) |
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if isinstance(msg, ua.Message): |
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if header.MessageType == ua.MessageType.SecureOpen: |
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self.open_secure_channel(msg.SecurityHeader(), msg.SequenceHeader(), msg.body()) |
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elif header.MessageType == ua.MessageType.SecureClose: |
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self._connection.close() |
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return False |
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elif header.MessageType == ua.MessageType.SecureMessage: |
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return await self.process_message(msg.SequenceHeader(), msg.body()) |
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elif isinstance(msg, ua.Hello): |
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ack = ua.Acknowledge() |
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ack.ReceiveBufferSize = msg.ReceiveBufferSize |
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ack.SendBufferSize = msg.SendBufferSize |
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data = uatcp_to_binary(ua.MessageType.Acknowledge, ack) |
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self._transport.write(data) |
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elif isinstance(msg, ua.ErrorMessage): |
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_logger.warning("Received an error message type") |
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elif msg is None: |
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pass # msg is a ChunkType.Intermediate of an ua.MessageType.SecureMessage |
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else: |
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_logger.warning("Unsupported message type: %s", header.MessageType) |
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raise ServiceError(ua.StatusCodes.BadTcpMessageTypeInvalid) |
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return True |
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async def process_message(self, seqhdr, body): |
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""" |
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Process incoming messages. |
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""" |
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typeid = nodeid_from_binary(body) |
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requesthdr = struct_from_binary(ua.RequestHeader, body) |
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_logger.debug('process_message %r %r', typeid, requesthdr) |
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try: |
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return await self._process_message(typeid, requesthdr, seqhdr, body) |
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except ServiceError as e: |
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status = ua.StatusCode(e.code) |
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response = ua.ServiceFault() |
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response.ResponseHeader.ServiceResult = status |
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_logger.error("sending service fault response: %s (%s)", status.doc, status.name) |
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self.send_response(requesthdr.RequestHandle, seqhdr, response) |
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return True |
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except Exception: |
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_logger.exception('Error while processing message') |
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response = ua.ServiceFault() |
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response.ResponseHeader.ServiceResult = ua.StatusCode(ua.StatusCodes.BadInternalError) |
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self.send_response(requesthdr.RequestHandle, seqhdr, response) |
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return True |
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async def _process_message(self, typeid, requesthdr, seqhdr, body): |
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if typeid == ua.NodeId(ua.ObjectIds.CreateSessionRequest_Encoding_DefaultBinary): |
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_logger.info("Create session request") |
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params = struct_from_binary(ua.CreateSessionParameters, body) |
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# create the session on server |
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self.session = self.iserver.create_session(self.name, external=True) |
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# get a session creation result to send back |
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sessiondata = await self.session.create_session(params, sockname=self.sockname) |
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response = ua.CreateSessionResponse() |
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response.Parameters = sessiondata |
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response.Parameters.ServerCertificate = self._connection.security_policy.client_certificate |
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if self._connection.security_policy.server_certificate is None: |
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data = params.ClientNonce |
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else: |
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data = self._connection.security_policy.server_certificate + params.ClientNonce |
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response.Parameters.ServerSignature.Signature = \ |
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self._connection.security_policy.asymmetric_cryptography.signature(data) |
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response.Parameters.ServerSignature.Algorithm = self._connection.security_policy.AsymmetricSignatureURI |
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#_logger.info("sending create session response") |
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self.send_response(requesthdr.RequestHandle, seqhdr, response) |
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elif typeid == ua.NodeId(ua.ObjectIds.CloseSessionRequest_Encoding_DefaultBinary): |
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_logger.info("Close session request") |
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if self.session: |
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deletesubs = ua.ua_binary.Primitives.Boolean.unpack(body) |
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await self.session.close_session(deletesubs) |
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else: |
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_logger.info("Request to close non-existing session") |
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response = ua.CloseSessionResponse() |
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_logger.info("sending close session response") |
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self.send_response(requesthdr.RequestHandle, seqhdr, response) |
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elif typeid == ua.NodeId(ua.ObjectIds.ActivateSessionRequest_Encoding_DefaultBinary): |
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_logger.info("Activate session request") |
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params = struct_from_binary(ua.ActivateSessionParameters, body) |
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if not self.session: |
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_logger.info("request to activate non-existing session") |
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raise ServiceError(ua.StatusCodes.BadSessionIdInvalid) |
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if self._connection.security_policy.client_certificate is None: |
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data = self.session.nonce |
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else: |
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data = self._connection.security_policy.client_certificate + self.session.nonce |
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self._connection.security_policy.asymmetric_cryptography.verify(data, params.ClientSignature.Signature) |
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result = self.session.activate_session(params) |
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response = ua.ActivateSessionResponse() |
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response.Parameters = result |
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#_logger.info("sending read response") |
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self.send_response(requesthdr.RequestHandle, seqhdr, response) |
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elif typeid == ua.NodeId(ua.ObjectIds.ReadRequest_Encoding_DefaultBinary): |
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_logger.info("Read request") |
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params = struct_from_binary(ua.ReadParameters, body) |
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results = await self.session.read(params) |
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response = ua.ReadResponse() |
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response.Results = results |
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#_logger.info("sending read response") |
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self.send_response(requesthdr.RequestHandle, seqhdr, response) |
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elif typeid == ua.NodeId(ua.ObjectIds.WriteRequest_Encoding_DefaultBinary): |
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_logger.info("Write request") |
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params = struct_from_binary(ua.WriteParameters, body) |
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results = await self.session.write(params) |
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response = ua.WriteResponse() |
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response.Results = results |
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#_logger.info("sending write response") |
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self.send_response(requesthdr.RequestHandle, seqhdr, response) |
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elif typeid == ua.NodeId(ua.ObjectIds.BrowseRequest_Encoding_DefaultBinary): |
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_logger.info("Browse request") |
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params = struct_from_binary(ua.BrowseParameters, body) |
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results = await self.session.browse(params) |
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response = ua.BrowseResponse() |
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response.Results = results |
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#_logger.info("sending browse response") |
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self.send_response(requesthdr.RequestHandle, seqhdr, response) |
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elif typeid == ua.NodeId(ua.ObjectIds.GetEndpointsRequest_Encoding_DefaultBinary): |
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_logger.info("get endpoints request") |
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params = struct_from_binary(ua.GetEndpointsParameters, body) |
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endpoints = await self.iserver.get_endpoints(params, sockname=self.sockname) |
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response = ua.GetEndpointsResponse() |
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response.Endpoints = endpoints |
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#_logger.info("sending get endpoints response") |
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self.send_response(requesthdr.RequestHandle, seqhdr, response) |
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elif typeid == ua.NodeId(ua.ObjectIds.FindServersRequest_Encoding_DefaultBinary): |
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_logger.info("find servers request") |
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params = struct_from_binary(ua.FindServersParameters, body) |
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servers = self.iserver.find_servers(params) |
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response = ua.FindServersResponse() |
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response.Servers = servers |
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#_logger.info("sending find servers response") |
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self.send_response(requesthdr.RequestHandle, seqhdr, response) |
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elif typeid == ua.NodeId(ua.ObjectIds.RegisterServerRequest_Encoding_DefaultBinary): |
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_logger.info("register server request") |
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serv = struct_from_binary(ua.RegisteredServer, body) |
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self.iserver.register_server(serv) |
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response = ua.RegisterServerResponse() |
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#_logger.info("sending register server response") |
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self.send_response(requesthdr.RequestHandle, seqhdr, response) |
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elif typeid == ua.NodeId(ua.ObjectIds.RegisterServer2Request_Encoding_DefaultBinary): |
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_logger.info("register server 2 request") |
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params = struct_from_binary(ua.RegisterServer2Parameters, body) |
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240
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results = self.iserver.register_server2(params) |
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response = ua.RegisterServer2Response() |
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response.ConfigurationResults = results |
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#_logger.info("sending register server 2 response") |
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self.send_response(requesthdr.RequestHandle, seqhdr, response) |
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246
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elif typeid == ua.NodeId(ua.ObjectIds.TranslateBrowsePathsToNodeIdsRequest_Encoding_DefaultBinary): |
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_logger.info("translate browsepaths to nodeids request") |
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248
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params = struct_from_binary(ua.TranslateBrowsePathsToNodeIdsParameters, body) |
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249
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paths = await self.session.translate_browsepaths_to_nodeids(params.BrowsePaths) |
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response = ua.TranslateBrowsePathsToNodeIdsResponse() |
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response.Results = paths |
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252
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#_logger.info("sending translate browsepaths to nodeids response") |
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self.send_response(requesthdr.RequestHandle, seqhdr, response) |
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254
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255
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elif typeid == ua.NodeId(ua.ObjectIds.AddNodesRequest_Encoding_DefaultBinary): |
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256
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_logger.info("add nodes request") |
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257
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params = struct_from_binary(ua.AddNodesParameters, body) |
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258
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results = await self.session.add_nodes(params.NodesToAdd) |
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259
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response = ua.AddNodesResponse() |
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260
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response.Results = results |
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#_logger.info("sending add node response") |
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self.send_response(requesthdr.RequestHandle, seqhdr, response) |
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263
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264
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elif typeid == ua.NodeId(ua.ObjectIds.DeleteNodesRequest_Encoding_DefaultBinary): |
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265
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_logger.info("delete nodes request") |
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266
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params = struct_from_binary(ua.DeleteNodesParameters, body) |
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267
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results = await self.session.delete_nodes(params) |
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268
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response = ua.DeleteNodesResponse() |
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269
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response.Results = results |
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270
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#_logger.info("sending delete node response") |
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271
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self.send_response(requesthdr.RequestHandle, seqhdr, response) |
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272
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273
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elif typeid == ua.NodeId(ua.ObjectIds.AddReferencesRequest_Encoding_DefaultBinary): |
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274
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_logger.info("add references request") |
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275
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params = struct_from_binary(ua.AddReferencesParameters, body) |
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276
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results = await self.session.add_references(params.ReferencesToAdd) |
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277
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response = ua.AddReferencesResponse() |
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278
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response.Results = results |
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279
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#_logger.info("sending add references response") |
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280
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self.send_response(requesthdr.RequestHandle, seqhdr, response) |
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281
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282
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elif typeid == ua.NodeId(ua.ObjectIds.DeleteReferencesRequest_Encoding_DefaultBinary): |
|
283
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_logger.info("delete references request") |
|
284
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params = struct_from_binary(ua.DeleteReferencesParameters, body) |
|
285
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results = await self.session.delete_references(params.ReferencesToDelete) |
|
286
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response = ua.DeleteReferencesResponse() |
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287
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response.Parameters.Results = results |
|
288
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#_logger.info("sending delete references response") |
|
289
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|
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self.send_response(requesthdr.RequestHandle, seqhdr, response) |
|
290
|
|
|
|
|
291
|
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elif typeid == ua.NodeId(ua.ObjectIds.CreateSubscriptionRequest_Encoding_DefaultBinary): |
|
292
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|
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_logger.info("create subscription request") |
|
293
|
|
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params = struct_from_binary(ua.CreateSubscriptionParameters, body) |
|
294
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|
|
result = await self.session.create_subscription(params, callback=self.forward_publish_response) |
|
295
|
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|
response = ua.CreateSubscriptionResponse() |
|
296
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response.Parameters = result |
|
297
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#_logger.info("sending create subscription response") |
|
298
|
|
|
self.send_response(requesthdr.RequestHandle, seqhdr, response) |
|
299
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|
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|
|
300
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|
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elif typeid == ua.NodeId(ua.ObjectIds.DeleteSubscriptionsRequest_Encoding_DefaultBinary): |
|
301
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|
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_logger.info("delete subscriptions request") |
|
302
|
|
|
params = struct_from_binary(ua.DeleteSubscriptionsParameters, body) |
|
303
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|
|
results = await self.session.delete_subscriptions(params.SubscriptionIds) |
|
304
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|
|
response = ua.DeleteSubscriptionsResponse() |
|
305
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|
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response.Results = results |
|
306
|
|
|
#_logger.info("sending delete subscription response") |
|
307
|
|
|
self.send_response(requesthdr.RequestHandle, seqhdr, response) |
|
308
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309
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elif typeid == ua.NodeId(ua.ObjectIds.CreateMonitoredItemsRequest_Encoding_DefaultBinary): |
|
310
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|
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_logger.info("create monitored items request") |
|
311
|
|
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params = struct_from_binary(ua.CreateMonitoredItemsParameters, body) |
|
312
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|
|
results = await self.session.create_monitored_items(params) |
|
313
|
|
|
response = ua.CreateMonitoredItemsResponse() |
|
314
|
|
|
response.Results = results |
|
315
|
|
|
#_logger.info("sending create monitored items response") |
|
316
|
|
|
self.send_response(requesthdr.RequestHandle, seqhdr, response) |
|
317
|
|
|
|
|
318
|
|
|
elif typeid == ua.NodeId(ua.ObjectIds.ModifyMonitoredItemsRequest_Encoding_DefaultBinary): |
|
319
|
|
|
_logger.info("modify monitored items request") |
|
320
|
|
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params = struct_from_binary(ua.ModifyMonitoredItemsParameters, body) |
|
321
|
|
|
results = await self.session.modify_monitored_items(params) |
|
322
|
|
|
response = ua.ModifyMonitoredItemsResponse() |
|
323
|
|
|
response.Results = results |
|
324
|
|
|
#_logger.info("sending modify monitored items response") |
|
325
|
|
|
self.send_response(requesthdr.RequestHandle, seqhdr, response) |
|
326
|
|
|
|
|
327
|
|
|
elif typeid == ua.NodeId(ua.ObjectIds.DeleteMonitoredItemsRequest_Encoding_DefaultBinary): |
|
328
|
|
|
_logger.info("delete monitored items request") |
|
329
|
|
|
params = struct_from_binary(ua.DeleteMonitoredItemsParameters, body) |
|
330
|
|
|
results = await self.session.delete_monitored_items(params) |
|
331
|
|
|
response = ua.DeleteMonitoredItemsResponse() |
|
332
|
|
|
response.Results = results |
|
333
|
|
|
#_logger.info("sending delete monitored items response") |
|
334
|
|
|
self.send_response(requesthdr.RequestHandle, seqhdr, response) |
|
335
|
|
|
|
|
336
|
|
|
elif typeid == ua.NodeId(ua.ObjectIds.HistoryReadRequest_Encoding_DefaultBinary): |
|
337
|
|
|
_logger.info("history read request") |
|
338
|
|
|
params = struct_from_binary(ua.HistoryReadParameters, body) |
|
339
|
|
|
results = await self.session.history_read(params) |
|
340
|
|
|
response = ua.HistoryReadResponse() |
|
341
|
|
|
response.Results = results |
|
342
|
|
|
#_logger.info("sending history read response") |
|
343
|
|
|
self.send_response(requesthdr.RequestHandle, seqhdr, response) |
|
344
|
|
|
|
|
345
|
|
|
elif typeid == ua.NodeId(ua.ObjectIds.RegisterNodesRequest_Encoding_DefaultBinary): |
|
346
|
|
|
_logger.info("register nodes request") |
|
347
|
|
|
params = struct_from_binary(ua.RegisterNodesParameters, body) |
|
348
|
|
|
_logger.info("Node registration not implemented") |
|
349
|
|
|
response = ua.RegisterNodesResponse() |
|
350
|
|
|
response.Parameters.RegisteredNodeIds = params.NodesToRegister |
|
351
|
|
|
#_logger.info("sending register nodes response") |
|
352
|
|
|
self.send_response(requesthdr.RequestHandle, seqhdr, response) |
|
353
|
|
|
|
|
354
|
|
|
elif typeid == ua.NodeId(ua.ObjectIds.UnregisterNodesRequest_Encoding_DefaultBinary): |
|
355
|
|
|
_logger.info("unregister nodes request") |
|
356
|
|
|
params = struct_from_binary(ua.UnregisterNodesParameters, body) |
|
357
|
|
|
response = ua.UnregisterNodesResponse() |
|
358
|
|
|
#_logger.info("sending unregister nodes response") |
|
359
|
|
|
self.send_response(requesthdr.RequestHandle, seqhdr, response) |
|
360
|
|
|
|
|
361
|
|
|
elif typeid == ua.NodeId(ua.ObjectIds.PublishRequest_Encoding_DefaultBinary): |
|
362
|
|
|
_logger.debug("publish request") |
|
363
|
|
|
if not self.session: |
|
364
|
|
|
return False |
|
365
|
|
|
params = struct_from_binary(ua.PublishParameters, body) |
|
366
|
|
|
data = PublishRequestData(requesthdr=requesthdr, seqhdr=seqhdr) |
|
367
|
|
|
# Store the Publish Request (will be used to send publish answers from server) |
|
368
|
|
|
self._publish_requests.append(data) |
|
369
|
|
|
# If there is an enqueued result forward it immediately |
|
370
|
|
|
while self._publish_results: |
|
371
|
|
|
result = self._publish_results.popleft() |
|
372
|
|
|
if result.SubscriptionId not in self.session.subscription_service.active_subscription_ids: |
|
373
|
|
|
# Discard the result if the subscription is no longer active |
|
374
|
|
|
continue |
|
375
|
|
|
self.forward_publish_response(result) |
|
376
|
|
|
break |
|
377
|
|
|
self.session.publish(params.SubscriptionAcknowledgements) |
|
378
|
|
|
#_logger.debug("publish forward to server") |
|
379
|
|
|
|
|
380
|
|
|
elif typeid == ua.NodeId(ua.ObjectIds.RepublishRequest_Encoding_DefaultBinary): |
|
381
|
|
|
_logger.info("re-publish request") |
|
382
|
|
|
params = struct_from_binary(ua.RepublishParameters, body) |
|
383
|
|
|
msg = self.session.republish(params) |
|
384
|
|
|
response = ua.RepublishResponse() |
|
385
|
|
|
response.NotificationMessage = msg |
|
386
|
|
|
self.send_response(requesthdr.RequestHandle, seqhdr, response) |
|
387
|
|
|
|
|
388
|
|
|
elif typeid == ua.NodeId(ua.ObjectIds.CloseSecureChannelRequest_Encoding_DefaultBinary): |
|
389
|
|
|
_logger.info("close secure channel request") |
|
390
|
|
|
self._connection.close() |
|
391
|
|
|
response = ua.CloseSecureChannelResponse() |
|
392
|
|
|
self.send_response(requesthdr.RequestHandle, seqhdr, response) |
|
393
|
|
|
return False |
|
394
|
|
|
|
|
395
|
|
|
elif typeid == ua.NodeId(ua.ObjectIds.CallRequest_Encoding_DefaultBinary): |
|
396
|
|
|
_logger.info("call request") |
|
397
|
|
|
params = struct_from_binary(ua.CallParameters, body) |
|
398
|
|
|
results = await self.session.call(params.MethodsToCall) |
|
399
|
|
|
response = ua.CallResponse() |
|
400
|
|
|
response.Results = results |
|
401
|
|
|
self.send_response(requesthdr.RequestHandle, seqhdr, response) |
|
402
|
|
|
|
|
403
|
|
|
elif typeid == ua.NodeId(ua.ObjectIds.SetMonitoringModeRequest_Encoding_DefaultBinary): |
|
404
|
|
|
_logger.info("set monitoring mode request") |
|
405
|
|
|
params = struct_from_binary(ua.SetMonitoringModeParameters, body) |
|
406
|
|
|
# FIXME: Implement SetMonitoringMode |
|
407
|
|
|
# For now send dummy results to keep clients happy |
|
408
|
|
|
response = ua.SetMonitoringModeResponse() |
|
409
|
|
|
results = ua.SetMonitoringModeResult() |
|
410
|
|
|
ids = params.MonitoredItemIds |
|
411
|
|
|
statuses = [ua.StatusCode(ua.StatusCodes.Good) for node_id in ids] |
|
412
|
|
|
results.Results = statuses |
|
413
|
|
|
response.Parameters = results |
|
414
|
|
|
_logger.info("sending set monitoring mode response") |
|
415
|
|
|
self.send_response(requesthdr.RequestHandle, seqhdr, response) |
|
416
|
|
|
|
|
417
|
|
|
elif typeid == ua.NodeId(ua.ObjectIds.SetPublishingModeRequest_Encoding_DefaultBinary): |
|
418
|
|
|
_logger.info("set publishing mode request") |
|
419
|
|
|
params = struct_from_binary(ua.SetPublishingModeParameters, body) |
|
420
|
|
|
# FIXME: Implement SetPublishingMode |
|
421
|
|
|
# For now send dummy results to keep clients happy |
|
422
|
|
|
response = ua.SetPublishingModeResponse() |
|
423
|
|
|
results = ua.SetPublishingModeResult() |
|
424
|
|
|
ids = params.SubscriptionIds |
|
425
|
|
|
statuses = [ua.StatusCode(ua.StatusCodes.Good) for node_id in ids] |
|
426
|
|
|
results.Results = statuses |
|
427
|
|
|
response.Parameters = results |
|
428
|
|
|
_logger.info("sending set publishing mode response") |
|
429
|
|
|
self.send_response(requesthdr.RequestHandle, seqhdr, response) |
|
430
|
|
|
|
|
431
|
|
|
else: |
|
432
|
|
|
_logger.warning("Unknown message received %s", typeid) |
|
433
|
|
|
raise ServiceError(ua.StatusCodes.BadServiceUnsupported) |
|
434
|
|
|
|
|
435
|
|
|
return True |
|
436
|
|
|
|
|
437
|
|
|
async def close(self): |
|
438
|
|
|
""" |
|
439
|
|
|
to be called when client has disconnected to ensure we really close |
|
440
|
|
|
everything we should |
|
441
|
|
|
""" |
|
442
|
|
|
_logger.info("Cleanup client connection: %s", self.name) |
|
443
|
|
|
if self.session: |
|
444
|
|
|
await self.session.close_session(True) |
|
445
|
|
|
|
FreeOpcUa /
opcua-asyncio
