SECURITY! and cleanups
comprehensive checking to see packets are received from the IP and port that match the Radio ID, or master. HB Protocol has some weaknesses without this. More cleanup and documentation.
This commit is contained in:
Cort Buffington
parent
ca1f59cdb7
commit
cce709832b
352
hblink.py
352
hblink.py
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@ -111,11 +111,12 @@ def hex_str_4(_int_id):
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class HBMASTER(DatagramProtocol):
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def __init__(self, *args, **kwargs):
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if len(args) == 1:
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# Define a few shortcuts to make the rest of the class more readable
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self._master = args[0]
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self._config = CONFIG['MASTERS'][self._master]
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self._clients = CONFIG['MASTERS'][self._master]['CLIENTS']
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else:
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# If we didn't get called correctly, log it!
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# If we didn't get called correctly, log it and quit.
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logger.error('(%s) HBMASTER was not called with an argument. Terminating', self._master)
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sys.exit()
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@ -128,9 +129,10 @@ class HBMASTER(DatagramProtocol):
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logger.debug('(%s) Master maintenance loop started', self._master)
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for client in self._clients.keys():
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_this_client = self._clients[client]
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# Check to see if any of the clients have been quiet (no ping) longer than allowed
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if _this_client['LAST_PING']+CONFIG['GLOBAL']['PING_TIME']*CONFIG['GLOBAL']['MAX_MISSED'] < time():
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logger.info('(%s) Client %s has timed out', self._master, _this_client['RADIO_ID'])
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# Remove any timed out clients from the configuration
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del CONFIG['MASTERS'][self._master]['CLIENTS'][client]
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def send_packet(self, _client, _packet):
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@ -138,102 +140,126 @@ class HBMASTER(DatagramProtocol):
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# KEEP THE FOLLOWING COMMENTED OUT UNLESS YOU'RE DEBUGGING DEEPLY!!!!
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#logger.debug('(%s) TX Packet to %s on port %s: %s', self._client, self._config['MASTER_IP'], self._config['MASTER_PORT'], h(_packet))
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def datagramReceived(self, _data, (_host, _port)):
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_command = _data[:4]
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if _command == 'DMRD': # DMRData -- encapsulated DMR data frame
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logger.debug('(%s) DMRD Received', self._master)
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elif _command == 'RPTL': # RPTLogin -- a repeater wants to login
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_radio_id = _data[4:8]
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if _radio_id: # Future check here for valid Radio ID
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self._clients.update({_radio_id: {
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'CONNECTION': 'RPTL-RECEIVED',
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'PINGS_RECEIVED': 0,
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'LAST_PING': time(),
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'IP': _host,
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'PORT': _port,
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'SALT': randint(0,0xFFFFFFFF),
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'RADIO_ID': str(int(h(_radio_id), 16)),
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'CALLSIGN': '',
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'RX_FREQ': '',
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'TX_FREQ': '',
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'TX_POWER': '',
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'COLORCODE': '',
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'LATITUDE': '',
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'LONGITUDE': '',
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'HEIGHT': '',
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'LOCATION': '',
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'DESCRIPTION': '',
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'SLOTS': '',
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'URL': '',
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'SOFTWARE_ID': '',
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'PACKAGE_ID': '',
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}})
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logger.info('(%s) Repeater Logging in with Radio ID: %s', self._master, h(_radio_id))
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_salt_str = hex_str_4(self._clients[_radio_id]['SALT'])
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self.send_packet(_radio_id, 'RPTACK'+_salt_str)
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self._clients[_radio_id]['CONNECTION'] = 'CHALLENGE_SENT'
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logger.info('(%s) Sent Challenge Response to %s for login: %s', self._master, h(_radio_id), self._clients[_radio_id]['SALT'])
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else:
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self.transport.write('MSTNAK'+_radio_id, (_host, _port))
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logger.info('(%s) Invalid Login from Radio ID: %s', self._master, h(_radio_id))
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elif _command == 'RPTK': # Repeater has answered our login challenge
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_radio_id = _data[4:8]
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if _radio_id in self._clients and self._clients[_radio_id]['CONNECTION'] == 'CHALLENGE_SENT':
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_this_client = self._clients[_radio_id]
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_this_client['LAST_PING'] = time()
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_sent_hash = _data[8:]
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_salt_str = hex_str_4(_this_client['SALT'])
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_calc_hash = a(sha256(_salt_str+self._config['PASSPHRASE']).hexdigest())
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if _sent_hash == _calc_hash:
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_this_client['CONNECTION'] = 'WAITING_CONFIG'
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self.send_packet(_radio_id, 'RPTACK'+_radio_id)
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logger.info('(%s) Client %s has completed the login exchange successfully', self._master, _this_client['RADIO_ID'])
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else:
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logger.info('(%s) Client %s has FAILED the login exchange successfully', self._master, _this_client['RADIO_ID'])
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self.transport.write('MSTNAK'+_radio_id, (_host, _port))
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del self._clients[_radio_id]
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else:
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self.transport.write('MSTNAK'+_radio_id, (_host, _port))
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logger.info('(%s) Login challenge from Radio ID that has not logged in: %s', self._master, h(_radio_id))
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elif _command == 'RPTC': # Repeater is sending it's configuraiton information
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_radio_id = _data[4:8]
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if _radio_id in self._clients and self._clients[_radio_id]['CONNECTION'] == 'WAITING_CONFIG':
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_this_client = self._clients[_radio_id]
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_this_client['CONNECTION'] = 'YES'
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_this_client['LAST_PING'] = time()
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_this_client['CALLSIGN'] = _data[8:16]
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_this_client['RX_FREQ'] = _data[16:25]
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_this_client['TX_FREQ'] = _data[25:34]
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_this_client['TX_POWER'] = _data[34:36]
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_this_client['COLORCODE'] = _data[36:38]
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_this_client['LATITUDE'] = _data[38:47]
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_this_client['LONGITUDE'] = _data[47:57]
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_this_client['HEIGHT'] = _data[57:60]
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_this_client['LOCATION'] = _data[60:80]
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_this_client['DESCRIPTION'] = _data[80:99]
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_this_client['SLOTS'] = _data[99:100]
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_this_client['URL'] = _data[100:224]
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_this_client['SOFTWARE_ID'] = _data[224:264]
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_this_client['PACKAGE_ID'] = _data[264:304]
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def dmrd_received(self, _radio_id, _data):
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pass
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self.send_packet(_radio_id, 'RPTACK'+_radio_id)
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logger.info('(%s) Client %s has sent repeater configuration', self._master, _this_client['RADIO_ID'])
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else:
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self.transport.write('MSTNAK'+_radio_id, (_host, _port))
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logger.info('(%s) Client info from Radio ID that has not logged in: %s', self._master, h(_radio_id))
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def datagramReceived(self, _data, (_host, _port)):
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# Extract the command, which is various length, but only 4 significant characters
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_command = _data[:4]
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if _command == 'DMRD': # DMRData -- encapsulated DMR data frame
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_radio_id = _data[4:8]
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if _radio_id in self._clients \
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and self._clients[_radio_id]['IP'] == _host \
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and self._clients[_radio_id]['PORT'] == _port:
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logger.debug('(%s) DMRD Received', self._master)
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self.dmrd_received(_radio_id, _data)
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else:
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logger.warning('(%s) DMRD packet recieved from an invalid client')
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elif _command == 'RPTL': # RPTLogin -- a repeater wants to login
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_radio_id = _data[4:8]
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if _radio_id: # Future check here for valid Radio ID
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self._clients.update({_radio_id: { # Build the configuration data strcuture for the client
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'CONNECTION': 'RPTL-RECEIVED',
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'PINGS_RECEIVED': 0,
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'LAST_PING': time(),
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'IP': _host,
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'PORT': _port,
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'SALT': randint(0,0xFFFFFFFF),
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'RADIO_ID': str(int(h(_radio_id), 16)),
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'CALLSIGN': '',
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'RX_FREQ': '',
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'TX_FREQ': '',
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'TX_POWER': '',
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'COLORCODE': '',
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'LATITUDE': '',
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'LONGITUDE': '',
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'HEIGHT': '',
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'LOCATION': '',
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'DESCRIPTION': '',
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'SLOTS': '',
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'URL': '',
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'SOFTWARE_ID': '',
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'PACKAGE_ID': '',
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}})
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logger.info('(%s) Repeater Logging in with Radio ID: %s', self._master, h(_radio_id))
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_salt_str = hex_str_4(self._clients[_radio_id]['SALT'])
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self.send_packet(_radio_id, 'RPTACK'+_salt_str)
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self._clients[_radio_id]['CONNECTION'] = 'CHALLENGE_SENT'
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logger.info('(%s) Sent Challenge Response to %s for login: %s', self._master, h(_radio_id), self._clients[_radio_id]['SALT'])
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else:
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self.transport.write('MSTNAK'+_radio_id, (_host, _port))
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logger.warning('(%s) Invalid Login from Radio ID: %s', self._master, h(_radio_id))
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elif _command == 'RPTK': # Repeater has answered our login challenge
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_radio_id = _data[4:8]
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if _radio_id in self._clients \
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and self._clients[_radio_id]['CONNECTION'] == 'CHALLENGE_SENT' \
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and self._clients[_radio_id]['IP'] == _host \
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and self._clients[_radio_id]['PORT'] == _port:
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_this_client = self._clients[_radio_id]
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_this_client['LAST_PING'] = time()
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_sent_hash = _data[8:]
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_salt_str = hex_str_4(_this_client['SALT'])
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_calc_hash = a(sha256(_salt_str+self._config['PASSPHRASE']).hexdigest())
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if _sent_hash == _calc_hash:
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_this_client['CONNECTION'] = 'WAITING_CONFIG'
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self.send_packet(_radio_id, 'RPTACK'+_radio_id)
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logger.info('(%s) Client %s has completed the login exchange successfully', self._master, _this_client['RADIO_ID'])
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else:
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logger.info('(%s) Client %s has FAILED the login exchange successfully', self._master, _this_client['RADIO_ID'])
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self.transport.write('MSTNAK'+_radio_id, (_host, _port))
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del self._clients[_radio_id]
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else:
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self.transport.write('MSTNAK'+_radio_id, (_host, _port))
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logger.warning('(%s) Login challenge from Radio ID that has not logged in: %s', self._master, h(_radio_id))
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elif _command == 'RPTC': # Repeater is sending it's configuraiton information
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_radio_id = _data[4:8]
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if _radio_id in self._clients \
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and self._clients[_radio_id]['CONNECTION'] == 'WAITING_CONFIG' \
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and self._clients[_radio_id]['IP'] == _host \
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and self._clients[_radio_id]['PORT'] == _port:
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_this_client = self._clients[_radio_id]
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_this_client['CONNECTION'] = 'YES'
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_this_client['LAST_PING'] = time()
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_this_client['CALLSIGN'] = _data[8:16]
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_this_client['RX_FREQ'] = _data[16:25]
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_this_client['TX_FREQ'] = _data[25:34]
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_this_client['TX_POWER'] = _data[34:36]
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_this_client['COLORCODE'] = _data[36:38]
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_this_client['LATITUDE'] = _data[38:47]
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_this_client['LONGITUDE'] = _data[47:57]
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_this_client['HEIGHT'] = _data[57:60]
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_this_client['LOCATION'] = _data[60:80]
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_this_client['DESCRIPTION'] = _data[80:99]
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_this_client['SLOTS'] = _data[99:100]
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_this_client['URL'] = _data[100:224]
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_this_client['SOFTWARE_ID'] = _data[224:264]
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_this_client['PACKAGE_ID'] = _data[264:304]
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self.send_packet(_radio_id, 'RPTACK'+_radio_id)
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logger.info('(%s) Client %s has sent repeater configuration', self._master, _this_client['RADIO_ID'])
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else:
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self.transport.write('MSTNAK'+_radio_id, (_host, _port))
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logger.warning('(%s) Client info from Radio ID that has not logged in: %s', self._master, h(_radio_id))
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elif _command == 'RPTP': # RPTPing -- client is pinging us
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_radio_id = _data[7:11]
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if _radio_id in self._clients and self._clients[_radio_id]['CONNECTION'] == "YES":
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self._clients['LAST_PING'] = time()
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self.send_packet(_radio_id, 'MSTPONG'+_radio_id)
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logger.info('(%s) Received and answered RPTPING from client %s', self._master, h(_radio_id))
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elif _command == 'RPTP': # RPTPing -- client is pinging us
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_radio_id = _data[7:11]
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if _radio_id in self._clients \
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and self._clients[_radio_id]['CONNECTION'] == "YES" \
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and self._clients[_radio_id]['IP'] == _host \
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and self._clients[_radio_id]['PORT'] == _port:
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self._clients['LAST_PING'] = time()
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self.send_packet(_radio_id, 'MSTPONG'+_radio_id)
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logger.info('(%s) Received and answered RPTPING from client %s', self._master, h(_radio_id))
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else:
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self.transport.write('MSTNAK'+_radio_id, (_host, _port))
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logger.warning('(%s) Client info from Radio ID that has not logged in: %s', self._master, h(_radio_id))
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else:
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logger.error('(%s) Unrecognized command from: %s. Packet: %s', self._master, h(_radio_id), h(_data))
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#************************************************
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# HB CLIENT CLASS
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@ -257,89 +283,103 @@ class HBCLIENT(DatagramProtocol):
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def client_maintenance_loop(self):
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logger.debug('(%s) Client maintenance loop started', self._client)
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# If we're not connected, zero out the stats and send a login request RPTL
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if self._stats['CONNECTION'] == 'NO':
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self._stats['PINGS_SENT'] = 0
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self._stats['PINGS_ACKD'] = 0
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self._stats['CONNECTION'] = 'RTPL_SENT'
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self.send_packet('RPTL'+self._config['RADIO_ID'])
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logger.info('(%s) Sending login request to master', self._client)
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# If we are connected, sent a ping to the master and increment the counter
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if self._stats['CONNECTION'] == 'YES':
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self.send_packet('RPTPING'+self._config['RADIO_ID'])
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self._stats['PINGS_SENT'] += 1
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logger.info('(%s) RPTPING Sent to Master. Total Pings Since Connected: %s', self._client, self._stats['PINGS_SENT'])
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logger.info('(%s) RPTPING Sent to Master. Pings Since Connected: %s', self._client, self._stats['PINGS_SENT'])
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def send_packet(self, _packet):
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self.transport.write(_packet, (self._config['MASTER_IP'], self._config['MASTER_PORT']))
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# KEEP THE FOLLOWING COMMENTED OUT UNLESS YOU'RE DEBUGGING DEEPLY!!!!
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#logger.debug('(%s) TX Packet to %s on port %s: %s', self._client, self._config['MASTER_IP'], self._config['MASTER_PORT'], h(_packet))
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def dmrd_received(self, _radio_id, _data):
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pass
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def datagramReceived(self, _data, (_host, _port)):
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# Validate that we receveived this packet from the master - security check!
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if self._config['MASTER_IP'] == _host and self._config['MASTER_PORT'] == _port:
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# Extract the command, which is various length, but only 4 significant characters
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_command = _data[:4]
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if _command == 'DMRD': # DMRData -- encapsulated DMR data frame
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_radio_id = _data[4:8]
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if self._config['RADIO_ID'] == _radio_id: # Check to ensure this packet is meant for us
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logger.debug('(%s) DMRD Received', self._client)
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self.dmrd_received(_radio_id, _data)
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_command = _data[:4]
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if _command == 'DMRD': # DMRData -- encapsulated DMR data frame
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logger.debug('(%s) DMRD Received', self._client)
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elif _command == 'MSTN': # Actually MSTNAK -- a NACK from the master
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if self._config['RADIO_ID'] == _radio_id: # Check to ensure this packet is meant for us
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print('(%s) MSTNAK Received', self._client)
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self._stats['CONNECTION'] = 'NO' # Disconnect ourselves and re-register
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elif _command == 'MSTN': # Actually MSTNAK -- a NACK from the master
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print('(%s) MSTNAK Received', self._client)
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self._stats['CONNECTION'] = 'NO'
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elif _command == 'RPTA': # Actually RPTACK -- an ACK from the master
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# Depending on the state, an RPTACK means different things, in each clause, we check and/or set the state
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if self._stats['CONNECTION'] == 'RTPL_SENT': # If we've sent a login request...
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_login_int32 = _data[6:10]
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logger.info('(%s) Repeater Login ACK Received with 32bit ID: %s', self._client, h(_login_int32))
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_pass_hash = sha256(_login_int32+self._config['PASSPHRASE']).hexdigest()
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_pass_hash = a(_pass_hash)
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self.send_packet('RPTK'+self._config['RADIO_ID']+_pass_hash)
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self._stats['CONNECTION'] = 'AUTHENTICATED'
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elif _command == 'RPTA': # Actually RPTACK -- an ACK from the master
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if self._stats['CONNECTION'] == 'RTPL_SENT':
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_login_int32 = _data[6:10]
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logger.info('(%s) Repeater Login ACK Received with 32bit ID: %s', self._client, h(_login_int32))
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_pass_hash = sha256(_login_int32+self._config['PASSPHRASE']).hexdigest()
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_pass_hash = a(_pass_hash)
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self.send_packet('RPTK'+self._config['RADIO_ID']+_pass_hash)
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self._stats['CONNECTION'] = 'AUTHENTICATED'
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elif self._stats['CONNECTION'] == 'AUTHENTICATED':
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if _data[6:10] == self._config['RADIO_ID']:
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logger.info('(%s) Repeater Authentication Accepted', self._client)
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_config_packet = self._config['RADIO_ID']+\
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self._config['CALLSIGN']+\
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self._config['RX_FREQ']+\
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self._config['TX_FREQ']+\
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self._config['TX_POWER']+\
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self._config['COLORCODE']+\
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self._config['LATITUDE']+\
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self._config['LONGITUDE']+\
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self._config['HEIGHT']+\
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self._config['LOCATION']+\
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self._config['DESCRIPTION']+\
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self._config['SLOTS']+\
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self._config['URL']+\
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self._config['SOFTWARE_ID']+\
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self._config['PACKAGE_ID']
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self.send_packet('RPTC'+_config_packet)
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self._stats['CONNECTION'] = 'CONFIG-SENT'
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logger.info('(%s) Repeater Configuration Sent', self._client)
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else:
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self._stats['CONNECTION'] = 'NO'
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logger.error('(%s) Master ACK Contained wrong ID - Connection Reset', self._client)
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elif self._stats['CONNECTION'] == 'CONFIG-SENT':
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if _data[6:10] == self._config['RADIO_ID']:
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logger.info('(%s) Repeater Configuration Accepted', self._client)
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self._stats['CONNECTION'] = 'YES'
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logger.info('(%s) Connection to Master Completed', self._client)
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else:
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self._stats['CONNECTION'] = 'NO'
|
||||
logger.error('(%s) Master ACK Contained wrong ID - Connection Reset', self._client)
|
||||
elif self._stats['CONNECTION'] == 'AUTHENTICATED': # If we've sent the login challenge...
|
||||
if _data[6:10] == self._config['RADIO_ID']:
|
||||
logger.info('(%s) Repeater Authentication Accepted', self._client)
|
||||
_config_packet = self._config['RADIO_ID']+\
|
||||
self._config['CALLSIGN']+\
|
||||
self._config['RX_FREQ']+\
|
||||
self._config['TX_FREQ']+\
|
||||
self._config['TX_POWER']+\
|
||||
self._config['COLORCODE']+\
|
||||
self._config['LATITUDE']+\
|
||||
self._config['LONGITUDE']+\
|
||||
self._config['HEIGHT']+\
|
||||
self._config['LOCATION']+\
|
||||
self._config['DESCRIPTION']+\
|
||||
self._config['SLOTS']+\
|
||||
self._config['URL']+\
|
||||
self._config['SOFTWARE_ID']+\
|
||||
self._config['PACKAGE_ID']
|
||||
|
||||
self.send_packet('RPTC'+_config_packet)
|
||||
self._stats['CONNECTION'] = 'CONFIG-SENT'
|
||||
logger.info('(%s) Repeater Configuration Sent', self._client)
|
||||
else:
|
||||
self._stats['CONNECTION'] = 'NO'
|
||||
logger.error('(%s) Master ACK Contained wrong ID - Connection Reset', self._client)
|
||||
|
||||
elif _command == 'MSTP': # Actually MSTPONG -- a reply to RPTPING (send by client)
|
||||
self._stats['PINGS_ACKD'] += 1
|
||||
logger.info('(%s) MSTPONG Received. Total Pongs Since Connected: %s', self._client, self._stats['PINGS_ACKD'])
|
||||
elif self._stats['CONNECTION'] == 'CONFIG-SENT': # If we've sent out configuration to the master
|
||||
if _data[6:10] == self._config['RADIO_ID']:
|
||||
logger.info('(%s) Repeater Configuration Accepted', self._client)
|
||||
self._stats['CONNECTION'] = 'YES'
|
||||
logger.info('(%s) Connection to Master Completed', self._client)
|
||||
else:
|
||||
self._stats['CONNECTION'] = 'NO'
|
||||
logger.error('(%s) Master ACK Contained wrong ID - Connection Reset', self._client)
|
||||
|
||||
elif _command == 'MSTP': # Actually MSTPONG -- a reply to RPTPING (send by client)
|
||||
if _data [7:11] == self._config['RADIO_ID']:
|
||||
self._stats['PINGS_ACKD'] += 1
|
||||
logger.info('(%s) MSTPONG Received. Total Pongs Since Connected: %s', self._client, self._stats['PINGS_ACKD'])
|
||||
|
||||
elif _command == 'MSTC': # Actually MSTCL -- notify us the master is closing down
|
||||
self._stats['CONNECTION'] = 'NO'
|
||||
logger.info('(%s) MSTCL Recieved', self._client)
|
||||
elif _command == 'MSTC': # Actually MSTCL -- notify us the master is closing down
|
||||
if _data[5:9] == self._config['RADIO_ID']:
|
||||
self._stats['CONNECTION'] = 'NO'
|
||||
logger.info('(%s) MSTCL Recieved', self._client)
|
||||
|
||||
else:
|
||||
logger.error('(%s) Received an invalid command in packet: %s', self._client, h(_data))
|
||||
else:
|
||||
logger.error('(%s) Received an invalid command in packet: %s', self._client, h(_data))
|
||||
|
||||
# Keep This Line Commented Unless HEAVILY Debugging!
|
||||
#logger.debug('(%s) Received Packet: %s', self._client, h(_data))
|
||||
# Keep This Line Commented Unless HEAVILY Debugging!
|
||||
#logger.debug('(%s) Received Packet: %s', self._client, h(_data))
|
||||
|
||||
|
||||
#************************************************
|
||||
|
|
|
|||
Loading…
Reference in New Issue