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import logging |
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from threading import RLock, Lock |
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from datetime import datetime |
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import time |
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from opcua import ua |
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from opcua.common import utils |
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class PublishRequestData(object): |
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def __init__(self): |
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self.requesthdr = None |
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self.algohdr = None |
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self.seqhdr = None |
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self.timestamp = time.time() |
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class UaProcessor(object): |
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def __init__(self, internal_server, socket): |
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self.logger = logging.getLogger(__name__) |
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self.iserver = internal_server |
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self.name = socket.get_extra_info('peername') |
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self.sockname = socket.get_extra_info('sockname') |
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self.session = None |
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self.channel = None |
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self.socket = socket |
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self._socketlock = Lock() |
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self._datalock = RLock() |
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self._publishdata_queue = [] |
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self._publish_result_queue = [] # used when we need to wait for PublishRequest |
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self._connection = ua.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, algohdr, seqhdr, response, msgtype=ua.MessageType.SecureMessage): |
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with self._socketlock: |
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response.ResponseHeader.RequestHandle = requesthandle |
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data = self._connection.message_to_binary(response.to_binary(), msgtype, seqhdr.RequestId) |
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self.socket.write(data) |
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45
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def open_secure_channel(self, algohdr, seqhdr, body): |
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request = ua.OpenSecureChannelRequest.from_binary(body) |
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48
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self._connection.select_policy(algohdr.SecurityPolicyURI, algohdr.SenderCertificate, request.Parameters.SecurityMode) |
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channel = self._open_secure_channel(request.Parameters) |
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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, algohdr, seqhdr, response, ua.MessageType.SecureOpen) |
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55
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def forward_publish_response(self, result): |
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self.logger.info("forward publish response %s", result) |
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with self._datalock: |
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while True: |
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if len(self._publishdata_queue) == 0: |
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self._publish_result_queue.append(result) |
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self.logger.info("Server wants to send publish answer but no publish request is available, enqueing notification, length of result queue is %s", len(self._publish_result_queue)) |
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return |
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requestdata = self._publishdata_queue.pop(0) |
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if time.time() - requestdata.timestamp < requestdata.requesthdr.TimeoutHint / 1000: |
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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.algohdr, requestdata.seqhdr, response) |
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72
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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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if not self.channel or header.ChannelId != self.channel.SecurityToken.ChannelId: |
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self.logger.warning("Request to close channel %s which was not issued, current channel is %s", header.ChannelId, self.channel) |
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return False |
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elif header.MessageType == ua.MessageType.SecureMessage: |
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return self.process_message(msg.SecurityHeader(), msg.SequenceHeader(), msg.body()) |
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85
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86
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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 = self._connection.tcp_to_binary(ua.MessageType.Acknowledge, ack) |
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self.socket.write(data) |
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93
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elif isinstance(msg, ua.ErrorMessage): |
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self.logger.warning("Received an error message type") |
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else: |
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self.logger.warning("Unsupported message type: %s", header.MessageType) |
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raise utils.ServiceError(ua.StatusCodes.BadTcpMessageTypeInvalid) |
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return True |
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def process_message(self, algohdr, seqhdr, body): |
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typeid = ua.NodeId.from_binary(body) |
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requesthdr = ua.RequestHeader.from_binary(body) |
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try: |
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return self._process_message(typeid, requesthdr, algohdr, seqhdr, body) |
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except utils.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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self.logger.info("sending service fault response: %s (%s)", status.doc, status.name) |
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self.send_response(requesthdr.RequestHandle, algohdr, seqhdr, response) |
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return True |
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def _process_message(self, typeid, requesthdr, algohdr, seqhdr, body): |
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if typeid == ua.NodeId(ua.ObjectIds.CreateSessionRequest_Encoding_DefaultBinary): |
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self.logger.info("Create session request") |
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params = ua.CreateSessionParameters.from_binary(body) |
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self.session = self.iserver.create_session(self.name, external=True) # create the session on server |
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sessiondata = self.session.create_session(params, sockname=self.sockname) # get a session creation result to send back |
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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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response.Parameters.ServerSignature.Signature = self._connection._security_policy.asymmetric_cryptography.signature(self._connection._security_policy.server_certificate + params.ClientNonce) |
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response.Parameters.ServerSignature.Algorithm = "http://www.w3.org/2000/09/xmldsig#rsa-sha1" |
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self.logger.info("sending create sesssion response") |
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self.send_response(requesthdr.RequestHandle, algohdr, seqhdr, response) |
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elif typeid == ua.NodeId(ua.ObjectIds.CloseSessionRequest_Encoding_DefaultBinary): |
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self.logger.info("Close session request") |
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deletesubs = ua.unpack_uatype('Boolean', body) |
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self.session.close_session(deletesubs) |
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response = ua.CloseSessionResponse() |
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self.logger.info("sending close sesssion response") |
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self.send_response(requesthdr.RequestHandle, algohdr, seqhdr, response) |
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140
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141
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elif typeid == ua.NodeId(ua.ObjectIds.ActivateSessionRequest_Encoding_DefaultBinary): |
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self.logger.info("Activate session request") |
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params = ua.ActivateSessionParameters.from_binary(body) |
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145
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if not self.session: |
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self.logger.info("request to activate non-existing session") |
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147
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raise utils.ServiceError(ua.StatusCodes.BadSessionIdInvalid) |
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148
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149
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self._connection._security_policy.asymmetric_cryptography.verify(self._connection._security_policy.client_certificate + self.session.nonce, params.ClientSignature.Signature) |
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150
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151
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result = self.session.activate_session(params) |
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152
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153
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response = ua.ActivateSessionResponse() |
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154
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response.Parameters = result |
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155
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156
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self.logger.info("sending read response") |
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157
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self.send_response(requesthdr.RequestHandle, algohdr, seqhdr, response) |
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158
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159
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1 |
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elif typeid == ua.NodeId(ua.ObjectIds.ReadRequest_Encoding_DefaultBinary): |
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160
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self.logger.info("Read request") |
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161
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params = ua.ReadParameters.from_binary(body) |
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162
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163
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results = self.session.read(params) |
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164
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165
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response = ua.ReadResponse() |
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166
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response.Results = results |
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167
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168
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self.logger.info("sending read response") |
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169
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self.send_response(requesthdr.RequestHandle, algohdr, seqhdr, response) |
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170
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171
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1 |
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elif typeid == ua.NodeId(ua.ObjectIds.WriteRequest_Encoding_DefaultBinary): |
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172
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self.logger.info("Write request") |
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173
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1 |
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params = ua.WriteParameters.from_binary(body) |
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174
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175
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results = self.session.write(params) |
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176
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177
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response = ua.WriteResponse() |
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178
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response.Results = results |
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179
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180
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self.logger.info("sending write response") |
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181
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self.send_response(requesthdr.RequestHandle, algohdr, seqhdr, response) |
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182
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183
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1 |
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elif typeid == ua.NodeId(ua.ObjectIds.BrowseRequest_Encoding_DefaultBinary): |
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184
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self.logger.info("Browse request") |
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185
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1 |
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params = ua.BrowseParameters.from_binary(body) |
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186
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187
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1 |
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results = self.session.browse(params) |
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188
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189
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response = ua.BrowseResponse() |
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190
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1 |
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response.Results = results |
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191
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192
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1 |
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self.logger.info("sending browse response") |
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193
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1 |
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self.send_response(requesthdr.RequestHandle, algohdr, seqhdr, response) |
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194
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195
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1 |
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elif typeid == ua.NodeId(ua.ObjectIds.GetEndpointsRequest_Encoding_DefaultBinary): |
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196
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1 |
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self.logger.info("get endpoints request") |
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197
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1 |
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params = ua.GetEndpointsParameters.from_binary(body) |
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198
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199
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1 |
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endpoints = self.iserver.get_endpoints(params, sockname=self.sockname) |
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200
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201
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1 |
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response = ua.GetEndpointsResponse() |
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202
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1 |
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response.Endpoints = endpoints |
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203
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204
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1 |
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self.logger.info("sending get endpoints response") |
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205
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1 |
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self.send_response(requesthdr.RequestHandle, algohdr, seqhdr, response) |
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206
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207
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1 |
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elif typeid == ua.NodeId(ua.ObjectIds.FindServersRequest_Encoding_DefaultBinary): |
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208
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1 |
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self.logger.info("find servers request") |
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209
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1 |
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params = ua.FindServersParameters.from_binary(body) |
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210
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211
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1 |
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servers = self.iserver.find_servers(params) |
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212
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213
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1 |
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response = ua.FindServersResponse() |
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214
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1 |
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response.Servers = servers |
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215
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216
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1 |
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self.logger.info("sending find servers response") |
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217
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1 |
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self.send_response(requesthdr.RequestHandle, algohdr, seqhdr, response) |
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218
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219
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1 |
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elif typeid == ua.NodeId(ua.ObjectIds.RegisterServerRequest_Encoding_DefaultBinary): |
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220
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1 |
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self.logger.info("register server request") |
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221
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1 |
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serv = ua.RegisteredServer.from_binary(body) |
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222
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223
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1 |
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self.iserver.register_server(serv) |
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224
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225
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1 |
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response = ua.RegisterServerResponse() |
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226
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227
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1 |
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self.logger.info("sending register server response") |
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228
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1 |
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self.send_response(requesthdr.RequestHandle, algohdr, seqhdr, response) |
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229
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230
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1 |
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elif typeid == ua.NodeId(ua.ObjectIds.RegisterServer2Request_Encoding_DefaultBinary): |
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231
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self.logger.info("register server 2 request") |
|
232
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params = ua.RegisterServer2Parameters.from_binary(body) |
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233
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|
234
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results = self.iserver.register_server2(params) |
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235
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|
236
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response = ua.RegisterServer2Response() |
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237
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response.ConfigurationResults = results |
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238
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239
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self.logger.info("sending register server 2 response") |
|
240
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self.send_response(requesthdr.RequestHandle, algohdr, seqhdr, response) |
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241
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242
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1 |
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elif typeid == ua.NodeId(ua.ObjectIds.TranslateBrowsePathsToNodeIdsRequest_Encoding_DefaultBinary): |
|
243
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1 |
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self.logger.info("translate browsepaths to nodeids request") |
|
244
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1 |
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params = ua.TranslateBrowsePathsToNodeIdsParameters.from_binary(body) |
|
245
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246
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1 |
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paths = self.session.translate_browsepaths_to_nodeids(params.BrowsePaths) |
|
247
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|
248
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1 |
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response = ua.TranslateBrowsePathsToNodeIdsResponse() |
|
249
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1 |
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response.Results = paths |
|
250
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251
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1 |
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self.logger.info("sending translate browsepaths to nodeids response") |
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252
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1 |
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self.send_response(requesthdr.RequestHandle, algohdr, seqhdr, response) |
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253
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254
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1 |
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elif typeid == ua.NodeId(ua.ObjectIds.AddNodesRequest_Encoding_DefaultBinary): |
|
255
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1 |
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self.logger.info("add nodes request") |
|
256
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1 |
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params = ua.AddNodesParameters.from_binary(body) |
|
257
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258
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1 |
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results = self.session.add_nodes(params.NodesToAdd) |
|
259
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260
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1 |
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response = ua.AddNodesResponse() |
|
261
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1 |
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response.Results = results |
|
262
|
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263
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1 |
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self.logger.info("sending add node response") |
|
264
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1 |
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self.send_response(requesthdr.RequestHandle, algohdr, seqhdr, response) |
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265
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266
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1 |
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elif typeid == ua.NodeId(ua.ObjectIds.DeleteNodesRequest_Encoding_DefaultBinary): |
|
267
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1 |
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self.logger.info("delete nodes request") |
|
268
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1 |
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params = ua.DeleteNodesParameters.from_binary(body) |
|
269
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|
270
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1 |
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results = self.session.delete_nodes(params.NodesToDelete) |
|
271
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272
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1 |
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response = ua.DeleteNodesResponse() |
|
273
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1 |
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response.Results = results |
|
274
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275
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1 |
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self.logger.info("sending delete node response") |
|
276
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1 |
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self.send_response(requesthdr.RequestHandle, algohdr, seqhdr, response) |
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277
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278
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1 |
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elif typeid == ua.NodeId(ua.ObjectIds.CreateSubscriptionRequest_Encoding_DefaultBinary): |
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279
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1 |
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self.logger.info("create subscription request") |
|
280
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1 |
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params = ua.CreateSubscriptionParameters.from_binary(body) |
|
281
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282
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1 |
|
result = self.session.create_subscription(params, self.forward_publish_response) |
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283
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|
|
|
284
|
1 |
|
response = ua.CreateSubscriptionResponse() |
|
285
|
1 |
|
response.Parameters = result |
|
286
|
|
|
|
|
287
|
1 |
|
self.logger.info("sending create subscription response") |
|
288
|
1 |
|
self.send_response(requesthdr.RequestHandle, algohdr, seqhdr, response) |
|
289
|
|
|
|
|
290
|
1 |
|
elif typeid == ua.NodeId(ua.ObjectIds.DeleteSubscriptionsRequest_Encoding_DefaultBinary): |
|
291
|
1 |
|
self.logger.info("delete subscriptions request") |
|
292
|
1 |
|
params = ua.DeleteSubscriptionsParameters.from_binary(body) |
|
293
|
|
|
|
|
294
|
1 |
|
results = self.session.delete_subscriptions(params.SubscriptionIds) |
|
295
|
|
|
|
|
296
|
1 |
|
response = ua.DeleteSubscriptionsResponse() |
|
297
|
1 |
|
response.Results = results |
|
298
|
|
|
|
|
299
|
1 |
|
self.logger.info("sending delte subscription response") |
|
300
|
1 |
|
self.send_response(requesthdr.RequestHandle, algohdr, seqhdr, response) |
|
301
|
|
|
|
|
302
|
1 |
|
elif typeid == ua.NodeId(ua.ObjectIds.CreateMonitoredItemsRequest_Encoding_DefaultBinary): |
|
303
|
1 |
|
self.logger.info("create monitored items request") |
|
304
|
1 |
|
params = ua.CreateMonitoredItemsParameters.from_binary(body) |
|
305
|
1 |
|
results = self.session.create_monitored_items(params) |
|
306
|
|
|
|
|
307
|
1 |
|
response = ua.CreateMonitoredItemsResponse() |
|
308
|
1 |
|
response.Results = results |
|
309
|
|
|
|
|
310
|
1 |
|
self.logger.info("sending create monitored items response") |
|
311
|
1 |
|
self.send_response(requesthdr.RequestHandle, algohdr, seqhdr, response) |
|
312
|
|
|
|
|
313
|
1 |
|
elif typeid == ua.NodeId(ua.ObjectIds.ModifyMonitoredItemsRequest_Encoding_DefaultBinary): |
|
314
|
|
|
self.logger.info("modify monitored items request") |
|
315
|
|
|
params = ua.ModifyMonitoredItemsParameters.from_binary(body) |
|
316
|
|
|
results = self.session.modify_monitored_items(params) |
|
317
|
|
|
|
|
318
|
|
|
response = ua.ModifyMonitoredItemsResponse() |
|
319
|
|
|
response.Results = results |
|
320
|
|
|
|
|
321
|
|
|
self.logger.info("sending modify monitored items response") |
|
322
|
|
|
self.send_response(requesthdr.RequestHandle, algohdr, seqhdr, response) |
|
323
|
|
|
|
|
324
|
1 |
|
elif typeid == ua.NodeId(ua.ObjectIds.DeleteMonitoredItemsRequest_Encoding_DefaultBinary): |
|
325
|
1 |
|
self.logger.info("delete monitored items request") |
|
326
|
1 |
|
params = ua.DeleteMonitoredItemsParameters.from_binary(body) |
|
327
|
|
|
|
|
328
|
1 |
|
results = self.session.delete_monitored_items(params) |
|
329
|
|
|
|
|
330
|
1 |
|
response = ua.DeleteMonitoredItemsResponse() |
|
331
|
1 |
|
response.Results = results |
|
332
|
|
|
|
|
333
|
1 |
|
self.logger.info("sending delete monitored items response") |
|
334
|
1 |
|
self.send_response(requesthdr.RequestHandle, algohdr, seqhdr, response) |
|
335
|
|
|
|
|
336
|
1 |
|
elif typeid == ua.NodeId(ua.ObjectIds.HistoryReadRequest_Encoding_DefaultBinary): |
|
337
|
|
|
self.logger.info("history read request") |
|
338
|
|
|
params = ua.HistoryReadParameters.from_binary(body) |
|
339
|
|
|
|
|
340
|
|
|
results = self.session.history_read(params) |
|
341
|
|
|
|
|
342
|
|
|
response = ua.HistoryReadResponse() |
|
343
|
|
|
response.Results = results |
|
344
|
|
|
|
|
345
|
|
|
self.logger.info("sending history read response") |
|
346
|
|
|
self.send_response(requesthdr.RequestHandle, algohdr, seqhdr, response) |
|
347
|
|
|
|
|
348
|
1 |
|
elif typeid == ua.NodeId(ua.ObjectIds.PublishRequest_Encoding_DefaultBinary): |
|
349
|
1 |
|
self.logger.info("publish request") |
|
350
|
|
|
|
|
351
|
1 |
|
if not self.session: |
|
352
|
|
|
return False |
|
353
|
|
|
|
|
354
|
1 |
|
params = ua.PublishParameters.from_binary(body) |
|
355
|
|
|
|
|
356
|
1 |
|
data = PublishRequestData() |
|
357
|
1 |
|
data.requesthdr = requesthdr |
|
358
|
1 |
|
data.seqhdr = seqhdr |
|
359
|
1 |
|
data.algohdr = algohdr |
|
360
|
1 |
|
with self._datalock: |
|
361
|
1 |
|
self._publishdata_queue.append(data) # will be used to send publish answers from server |
|
362
|
1 |
|
if self._publish_result_queue: |
|
363
|
|
|
result = self._publish_result_queue.pop(0) |
|
364
|
|
|
self.forward_publish_response(result) |
|
365
|
1 |
|
self.session.publish(params.SubscriptionAcknowledgements) |
|
366
|
1 |
|
self.logger.info("publish forward to server") |
|
367
|
|
|
|
|
368
|
1 |
|
elif typeid == ua.NodeId(ua.ObjectIds.RepublishRequest_Encoding_DefaultBinary): |
|
369
|
|
|
self.logger.info("re-publish request") |
|
370
|
|
|
|
|
371
|
|
|
params = ua.RepublishParameters.from_binary(body) |
|
372
|
|
|
msg = self.session.republish(params) |
|
373
|
|
|
|
|
374
|
|
|
response = ua.RepublishResponse() |
|
375
|
|
|
response.NotificationMessage = msg |
|
376
|
|
|
|
|
377
|
|
|
self.send_response(requesthdr.RequestHandle, algohdr, seqhdr, response) |
|
378
|
|
|
|
|
379
|
1 |
|
elif typeid == ua.NodeId(ua.ObjectIds.CloseSecureChannelRequest_Encoding_DefaultBinary): |
|
380
|
|
|
self.logger.info("close secure channel request") |
|
381
|
|
|
response = ua.CloseSecureChannelResponse() |
|
382
|
|
|
self.send_response(requesthdr.RequestHandle, algohdr, seqhdr, response) |
|
383
|
|
|
self.channel = None |
|
384
|
|
|
return False |
|
385
|
|
|
|
|
386
|
1 |
|
elif typeid == ua.NodeId(ua.ObjectIds.CallRequest_Encoding_DefaultBinary): |
|
387
|
1 |
|
self.logger.info("call request") |
|
388
|
|
|
|
|
389
|
1 |
|
params = ua.CallParameters.from_binary(body) |
|
390
|
|
|
|
|
391
|
1 |
|
results = self.session.call(params.MethodsToCall) |
|
392
|
|
|
|
|
393
|
1 |
|
response = ua.CallResponse() |
|
394
|
1 |
|
response.Results = results |
|
395
|
|
|
|
|
396
|
1 |
|
self.send_response(requesthdr.RequestHandle, algohdr, seqhdr, response) |
|
397
|
|
|
|
|
398
|
|
|
else: |
|
399
|
1 |
|
self.logger.warning("Unknown message received %s", typeid) |
|
400
|
1 |
|
raise utils.ServiceError(ua.StatusCodes.BadNotImplemented) |
|
401
|
|
|
|
|
402
|
1 |
|
return True |
|
403
|
|
|
|
|
404
|
1 |
|
def _open_secure_channel(self, params): |
|
405
|
1 |
|
self.logger.info("open secure channel") |
|
406
|
1 |
|
if not self.channel or params.RequestType == ua.SecurityTokenRequestType.Issue: |
|
407
|
1 |
|
self.channel = ua.OpenSecureChannelResult() |
|
408
|
1 |
|
self.channel.SecurityToken.TokenId = 13 # random value |
|
409
|
1 |
|
self.channel.SecurityToken.ChannelId = self.iserver.get_new_channel_id() |
|
410
|
1 |
|
self.channel.SecurityToken.RevisedLifetime = params.RequestedLifetime |
|
411
|
1 |
|
self.channel.SecurityToken.TokenId += 1 |
|
412
|
1 |
|
self.channel.SecurityToken.CreatedAt = datetime.utcnow() |
|
413
|
1 |
|
self.channel.SecurityToken.RevisedLifetime = params.RequestedLifetime |
|
414
|
1 |
|
self.channel.ServerNonce = utils.create_nonce(self._connection._security_policy.symmetric_key_size) |
|
415
|
1 |
|
self._connection.set_security_token(self.channel.SecurityToken) |
|
416
|
1 |
|
self._connection._security_policy.make_symmetric_key(self.channel.ServerNonce, params.ClientNonce) |
|
417
|
1 |
|
return self.channel |
|
418
|
|
|
|
|
419
|
1 |
|
def close(self): |
|
420
|
|
|
""" |
|
421
|
|
|
to be called when client has disconnected to ensure we really close |
|
422
|
|
|
everything we should |
|
423
|
|
|
""" |
|
424
|
1 |
|
print("Cleanup client connection: ", self.name) |
|
425
|
1 |
|
if self.session: |
|
426
|
|
|
self.session.close_session(True) |
|
427
|
|
|
|
FreeOpcUa /
python-opcua
