def on_message(ws, message):
logging.info('Recv message:%s', message)
retval = coapMessage.parseMessage(message)
msg_id = retval['messageId']
token = retval['token']
payload = retval['payload']
device_id = ntohl(long(payload[0:7]))
method = int(payload[8])
data = payload[9:]
logging.info('code %d, msg_id %d, device_id %x, method %d', retval['code'],
retval['messageId'], device_id, method)
logging.info('Message data:%s', data)
parameters = None
parameters = json.loads(data)
if parameters == None:
logging.error('Invalid message parameters, Drop')
return
'''
code class can indicate a request (0), a success
response (2), a client error response (4), or a server error
response (5). (All other class values are reserved.)
'''
code_class = retval['code'] >> 5
if code_class == 0:
#request
result = None
if method == CONFIG_METHOD:
result = devices_manager.device_config(device_id, parameters)
elif method == RELOAD_METHOD:
result = devices_manager.device_reload(device_id)
else:
logging.error('Unacceptable method:%d', method)
if retval['type'] == TYPE_CON:
if result:
result = json.dumps(result, separators=(',', ':'))
response_data = payload[0:8] + result
response = coapMessage.buildMessage(msgtype=coapDefines.TYPE_ACK,
token=token,
code=(0x2 << 5 | 0x4),
messageId=msg_id,
payload=response_data)
self.write_message(response)
else:
logging.info('Message result:%s', result)
elif code_class == 2 or code_class == 4 or code_class == 5:
#response
logging.info('Resonpse received')
else:
logging.error('Unacceptable message code class:%d', code_class)
def test_parseMessage(logFixture, messageAndBytes):
(msg,bytes) = messageAndBytes
bytes = list(bytes)
log.debug('bytes: {0}'.format(u.formatBuf(bytes)))
log.debug('msg: {0}'.format(msg))
result = m.parseMessage(bytes)
log.debug('result: {0}'.format(result))
assert result['type'] == msg[0]
assert result['token'] == msg[1]
assert result['code'] == msg[2]
assert result['messageId'] == msg[3]
assert len(result['options']) == len(msg[4])
for (o1,o2) in zip(result['options'],msg[4]):
assert repr(o1)==repr(o2)
assert result['payload'] == list(msg[5])
def test_parseMessage(logFixture, messageAndBytes):
(msg, bytes) = messageAndBytes
bytes = list(bytes)
log.debug('bytes: {0}'.format(u.formatBuf(bytes)))
log.debug('msg: {0}'.format(msg))
result = m.parseMessage(bytes)
log.debug('result: {0}'.format(result))
assert result['type'] == msg[0]
assert result['token'] == msg[1]
assert result['code'] == msg[2]
assert result['messageId'] == msg[3]
assert len(result['options']) == len(msg[4])
for (o1, o2) in zip(result['options'], msg[4]):
assert repr(o1) == repr(o2)
assert result['payload'] == list(msg[5])
def _receive(self, timestamp, sender, rawbytes):
# all UDP packets are received here
output = []
output += ['\n{0} _receive message:'.format(self.name)]
output += ['- timestamp: {0}'.format(timestamp)]
output += ['- sender: {0}'.format(sender)]
output += ['- bytes: {0}'.format(u.formatBuf(rawbytes))]
output = '\n'.join(output)
log.debug(output)
srcIp = sender[0]
srcIp = u.trimAddress(srcIp)
srcPort = sender[1]
# parse messages
try:
message = m.parseMessage(rawbytes)
options = message['options']
except e.messageFormatError as err:
log.warning('malformed message {0}: {1}'.format(
u.formatBuf(rawbytes), str(err)))
return
# dispatch message
try:
if message['code'] in d.METHOD_ALL:
# this is meant for a resource (request)
#==== decrypt message if encrypted
innerOptions = []
foundContext = None
requestPartialIV = None
if 'ciphertext' in message.keys():
# retrieve security context
# before decrypting we don't know what resource this request is meant for
# so we take the first binding with the correct context (recipientID)
blindContext = self._securityContextLookup(
u.buf2str(message['kid']))
if not blindContext:
if self.secContextHandler:
appContext = self.secContextHandler(
u.buf2str(message['kid']))
if not appContext:
raise e.coapRcUnauthorized(
'Security context not found.')
else:
raise e.coapRcUnauthorized(
'Security context not found.')
foundContext = blindContext if blindContext != None else appContext
requestPartialIV = u.zeroPadString(
u.buf2str(message['partialIV']),
foundContext.getIVLength())
# decrypt the message
try:
(innerOptions, plaintext) = oscoap.unprotectMessage(
foundContext,
version=message['version'],
code=message['code'],
options=message['options'],
ciphertext=message['ciphertext'],
partialIV=requestPartialIV)
except e.oscoapError as err:
raise e.coapRcBadRequest(
'OSCOAP unprotect failed: {0}'.format(str(err)))
payload = plaintext
else: # message not encrypted
payload = message['payload']
options += innerOptions
#==== find right resource
# retrieve path
path = coapUri.options2path(options)
log.debug('path="{0}"'.format(path))
# find resource that matches this path
resource = None
with self.resourceLock:
for r in self.resources:
if r.matchesPath(path):
resource = r
break
log.debug('resource={0}'.format(resource))
if not resource:
raise e.coapRcNotFound()
#==== check if appropriate security context was used for the resource
(context, authorizedMethods) = resource.getSecurityBinding()
if context is not None:
if context != foundContext:
raise e.coapRcUnauthorized(
'Unauthorized security context for the given resource'
)
objectSecurity = oscoap.objectSecurityOptionLookUp(options)
if objectSecurity:
objectSecurity.setContext(foundContext)
#==== get a response
# call the right resource's method
try:
if message[
'code'] == d.METHOD_GET and d.METHOD_GET in authorizedMethods:
(respCode, respOptions,
respPayload) = resource.GET(options=options)
elif message[
'code'] == d.METHOD_POST and d.METHOD_POST in authorizedMethods:
(respCode, respOptions,
respPayload) = resource.POST(options=options,
payload=payload)
elif message[
'code'] == d.METHOD_PUT and d.METHOD_PUT in authorizedMethods:
(respCode, respOptions,
respPayload) = resource.PUT(options=options,
payload=payload)
elif message[
'code'] == d.METHOD_DELETE and d.METHOD_DELETE in authorizedMethods:
(respCode, respOptions,
respPayload) = resource.DELETE(options=options)
elif message['code'] not in d.METHOD_ALL:
raise SystemError('unexpected code {0}'.format(
message['code']))
else:
raise e.coapRcUnauthorized(
'Unauthorized method for the given resource')
except Exception as err:
if isinstance(err, e.coapRc):
raise
else:
raise e.coapRcInternalServerError()
#==== send back response
# determine type of response packet
if message['type'] == d.TYPE_CON:
responseType = d.TYPE_ACK
elif message['type'] == d.TYPE_NON:
responseType = d.TYPE_NON
else:
raise SystemError('unexpected type {0}'.format(
message['type']))
# if resource is protected with a security context, add Object-Security option
if foundContext:
# verify that the Object-Security option was not set by the resource handler
assert not any(
isinstance(option, o.ObjectSecurity)
for option in respOptions)
objectSecurity = o.ObjectSecurity(context=foundContext)
respOptions += [objectSecurity]
# if Stateless-Proxy option was present in the request echo it
for option in options:
if isinstance(option, o.StatelessProxy):
respOptions += [option]
break
# build response packets and pass partialIV from the request for OSCOAP's processing
response = m.buildMessage(msgtype=responseType,
token=message['token'],
code=respCode,
messageId=message['messageId'],
options=respOptions,
payload=respPayload,
securityContext=foundContext,
partialIV=requestPartialIV)
# send
self.socketUdp.sendUdp(
destIp=srcIp,
destPort=srcPort,
msg=response,
)
elif message['code'] in d.COAP_RC_ALL:
# this is meant for a transmitter (response)
# find transmitter
msgkey = (srcIp, srcPort, message['token'],
message['messageId'])
found = False
with self.transmittersLock:
self._cleanupTransmitter()
for (k, v) in self.transmitters.items():
# try matching
if (msgkey[0] == k[0] and msgkey[1] == k[1]
and (msgkey[2] == k[2] or msgkey[3] == k[3])):
found = True
v.receiveMessage(timestamp, srcIp, srcPort,
message)
break
if found == False:
raise e.coapRcBadRequest(
'could not find transmitter corresponding to {0}, transmitters are {1}'
.format(
msgkey, ','.join(
[str(k) for k in self.transmitters.keys()])))
else:
raise NotImplementedError()
except e.coapRc as err:
# log
log.warning(err)
# determine type of response packet
if message['type'] == d.TYPE_CON:
responseType = d.TYPE_ACK
elif message['type'] == d.TYPE_NON:
responseType = d.TYPE_NON
else:
raise SystemError('unexpected type {0}'.format(
message['type']))
# if Stateless-Proxy option was present in the request echo it
errorOptions = []
for option in options:
if isinstance(option, o.StatelessProxy):
errorOptions += [option]
break
# build response packets
response = m.buildMessage(
msgtype=responseType,
token=message['token'],
code=err.rc,
messageId=message['messageId'],
options=errorOptions,
)
# send
self.socketUdp.sendUdp(
destIp=srcIp,
destPort=srcPort,
msg=response,
)
except Exception as err:
log.critical(traceback.format_exc())