HBLink/hblink.py

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#!/usr/bin/env python
#
# This work is licensed under the Creative Attribution-NonCommercial-ShareAlike
# 3.0 Unported License.To view a copy of this license, visit
# http://creativecommons.org/licenses/by-nc-sa/3.0/ or send a letter to
# Creative Commons, 444 Castro Street, Suite 900, Mountain View,
# California, 94041, USA.
from __future__ import print_function
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# Python modules we need
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import argparse
import sys
import os
import signal
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# Specifig functions from modules we need
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from binascii import b2a_hex as h
from binascii import a2b_hex as a
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from socket import gethostbyname
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from random import randint
from hashlib import sha256
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from time import time
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from bitstring import BitArray
import socket
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# Debugging functions
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from pprint import pprint
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# Twisted is pretty important, so I keep it separate
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from twisted.internet.protocol import DatagramProtocol
from twisted.internet import reactor
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from twisted.internet import task
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# Other files we pull from -- this is mostly for readability and segmentation
import hb_log
import hb_config
# Does anybody read this stuff? There's a PEP somewhere that says I should do this.
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__author__ = 'Cortney T. Buffington, N0MJS'
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__copyright__ = 'Copyright (c) 2016 Cortney T. Buffington, N0MJS and the K0USY Group'
__credits__ = 'Colin Durbridge, G4EML, Steve Zingman, N4IRS; Mike Zingman, N4IRR; Jonathan Naylor, G4KLX; Hans Barthen, DL5DI; Torsten Shultze, DG1HT'
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__license__ = 'Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported'
__maintainer__ = 'Cort Buffington, N0MJS'
__email__ = 'n0mjs@me.com'
__status__ = 'pre-alpha'
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# Global variables used whether we are a module or __main__
masters = {}
clients = {}
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# Change the current directory to the location of the application
os.chdir(os.path.dirname(os.path.realpath(sys.argv[0])))
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# CLI argument parser - handles picking up the config file from the command line, and sending a "help" message
parser = argparse.ArgumentParser()
parser.add_argument('-c', '--config', action='store', dest='CONFIG_FILE', help='/full/path/to/config.file (usually hblink.cfg)')
parser.add_argument('-l', '--logging', action='store', dest='LOG_LEVEL', help='Override config file logging level.')
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cli_args = parser.parse_args()
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# Ensure we have a path for the config file, if one wasn't specified, then use the execution directory
if not cli_args.CONFIG_FILE:
cli_args.CONFIG_FILE = os.path.dirname(os.path.abspath(__file__))+'/hblink.cfg'
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# Call the external routine to build the configuration dictionary
CONFIG = hb_config.build_config(cli_args.CONFIG_FILE)
# Call the external routing to start the system logger
if cli_args.LOG_LEVEL:
CONFIG['LOGGER']['LOG_LEVEL'] = cli_args.LOG_LEVEL
logger = hb_log.config_logging(CONFIG['LOGGER'])
logger.debug('Logging system started, anything from here on gets logged')
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# Shut ourselves down gracefully by disconnecting from the masters and clients.
def handler(_signal, _frame):
logger.info('*** HBLINK IS TERMINATING WITH SIGNAL %s ***', str(_signal))
for client in clients:
this_client = clients[client]
this_client.send_packet('RPTCL'+CONFIG['CLIENTS'][client]['RADIO_ID'])
logger.info('(%s) De-Registering From the Master', client)
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for master in masters:
this_master = masters[master]
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for client in CONFIG['MASTERS'][master]['CLIENTS']:
this_master.send_packet(client, 'MSTCL'+client)
logger.info('(%s) Sending De-Registration to Client: %s', master, CONFIG['MASTERS'][master]['CLIENTS'][client]['RADIO_ID'])
reactor.stop()
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# Set signal handers so that we can gracefully exit if need be
for sig in [signal.SIGTERM, signal.SIGINT, signal.SIGQUIT]:
signal.signal(sig, handler)
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#************************************************
# UTILITY FUNCTIONS
#************************************************
# Create a 3 byte hex string from an integer
def hex_str_3(_int_id):
try:
return hex(_int_id)[2:].rjust(6,'0').decode('hex')
except TypeError:
logger.error('hex_str_3: invalid integer length')
# Create a 4 byte hex string from an integer
def hex_str_4(_int_id):
try:
return hex(_int_id)[2:].rjust(8,'0').decode('hex')
except TypeError:
logger.error('hex_str_4: invalid integer length')
# Convert a hex string to an int (radio ID, etc.)
def int_id(_hex_string):
return int(h(_hex_string), 16)
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#************************************************
# AMBE CLASS: Used to parse out AMBE and send to gateway
#************************************************
class AMBE:
_sock = socket.socket(socket.AF_INET,socket.SOCK_DGRAM)
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_exp_ip = CONFIG['AMBE']['EXPORT_IP']
_exp_port = CONFIG['AMBE']['EXPORT_PORT']
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def parseAMBE(self, _client, _data):
_seq = int_id(_data[4:5])
_srcID = int_id(_data[5:8])
_dstID = int_id(_data[8:11])
_rptID = int_id(_data[11:15])
_bits = int_id(_data[15:16]) # SCDV NNNN (Slot|Call type|Data|Voice|Seq or Data type)
_slot = 2 if _bits & 0x80 else 1
_callType = 1 if (_bits & 0x40) else 0
_frameType = (_bits & 0x30) >> 4
_voiceSeq = (_bits & 0x0f)
_streamID = int_id(_data[16:20])
logger.debug('(%s) seq: %d srcID: %d dstID: %d rptID: %d bits: %0X slot:%d callType: %d frameType: %d voiceSeq: %d streamID: %0X',
_client, _seq, _srcID, _dstID, _rptID, _bits, _slot, _callType, _frameType, _voiceSeq, _streamID )
#logger.debug('Frame 1:(%s)', self.ByteToHex(_data))
_dmr_frame = BitArray('0x'+h(_data[20:]))
_ambe = _dmr_frame[0:108] + _dmr_frame[156:264]
#_sock.sendto(_ambe.tobytes(), ("127.0.0.1", 31000))
ambeBytes = _ambe.tobytes()
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self._sock.sendto(ambeBytes[0:9], (self._exp_ip, self._exp_port))
self._sock.sendto(ambeBytes[9:18], (self._exp_ip, self._exp_port))
self._sock.sendto(ambeBytes[18:27], (self._exp_ip, self._exp_port))
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#************************************************
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# HB MASTER CLASS
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#************************************************
class HBMASTER(DatagramProtocol):
def __init__(self, *args, **kwargs):
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if len(args) == 1:
# Define a few shortcuts to make the rest of the class more readable
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self._master = args[0]
self._config = CONFIG['MASTERS'][self._master]
self._clients = CONFIG['MASTERS'][self._master]['CLIENTS']
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# Configure for AMBE audio export if enabled
if self._config['EXPORT_AMBE']:
self._ambe = AMBE()
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else:
# 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)
sys.exit()
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def startProtocol(self):
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# Set up periodic loop for tracking pings from clients. Run every 'PING_TIME' seconds
self._master_maintenance = task.LoopingCall(self.master_maintenance_loop)
self._master_maintenance_loop = self._master_maintenance.start(CONFIG['GLOBAL']['PING_TIME'])
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def master_maintenance_loop(self):
logger.debug('(%s) Master maintenance loop started', self._master)
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for client in self._clients:
_this_client = self._clients[client]
# Check to see if any of the clients have been quiet (no ping) longer than allowed
if _this_client['LAST_PING']+CONFIG['GLOBAL']['PING_TIME']*CONFIG['GLOBAL']['MAX_MISSED'] < time():
logger.info('(%s) Client %s has timed out', self._master, _this_client['RADIO_ID'])
# Remove any timed out clients from the configuration
del CONFIG['MASTERS'][self._master]['CLIENTS'][client]
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def send_packet(self, _client, _packet):
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_ip = self._clients[_client]['IP']
_port = self._clients[_client]['PORT']
self.transport.write(_packet, (_ip, _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._clients[_client]['RADIO_ID'], self._clients[_client]['IP'], self._clients[_client]['PORT'], h(_packet))
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def dmrd_received(self, _radio_id, _rf_src, _dst_id, _seq, _data):
pass
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def datagramReceived(self, _data, (_host, _port)):
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# Keep This Line Commented Unless HEAVILY Debugging!
# logger.debug('(%s) RX packet from %s:%s -- %s', self._client, _host, _port, h(_data))
# Extract the command, which is various length, all but one 4 significant characters -- RPTCL
_command = _data[:4]
if _command == 'DMRD': # DMRData -- encapsulated DMR data frame
_radio_id = _data[11:15]
if _radio_id in self._clients \
and self._clients[_radio_id]['CONNECTION'] == 'YES' \
and self._clients[_radio_id]['IP'] == _host \
and self._clients[_radio_id]['PORT'] == _port:
_seq = _data[4:5]
_rf_src = _data[5:8]
_dst_id = _data[8:11]
logger.debug('(%s) DMRD - Seqence: %s, RF Source: %s, Destination ID: %s', self._master, int_id(_seq), int_id(_rf_src), int_id(_dst_id))
# If AMBE audio exporting is configured...
if self._config['EXPORT_AMBE']:
self._ambe.parseAMBE(self._master, _data)
# The basic purpose of a master is to repeat to the clients
if self._config['REPEAT'] == True:
for _client in self._clients:
if _client != _radio_id:
self.send_packet(_client, _data)
logger.debug('(%s) Packet repeated to client: %s', self._master, int_id(_client))
# Userland actions -- typically this is the function you subclass for an application
self.dmrd_received(_radio_id, _rf_src, _dst_id, _seq, _data)
elif _command == 'RPTL': # RPTLogin -- a repeater wants to login
_radio_id = _data[4:8]
if _radio_id: # Future check here for valid Radio ID
self._clients.update({_radio_id: { # Build the configuration data strcuture for the client
'CONNECTION': 'RPTL-RECEIVED',
'PINGS_RECEIVED': 0,
'LAST_PING': time(),
'IP': _host,
'PORT': _port,
'SALT': randint(0,0xFFFFFFFF),
'RADIO_ID': str(int(h(_radio_id), 16)),
'CALLSIGN': '',
'RX_FREQ': '',
'TX_FREQ': '',
'TX_POWER': '',
'COLORCODE': '',
'LATITUDE': '',
'LONGITUDE': '',
'HEIGHT': '',
'LOCATION': '',
'DESCRIPTION': '',
'SLOTS': '',
'URL': '',
'SOFTWARE_ID': '',
'PACKAGE_ID': '',
}})
logger.info('(%s) Repeater Logging in with Radio ID: %s, %s:%s', self._master, int_id(_radio_id), _host, _port)
_salt_str = hex_str_4(self._clients[_radio_id]['SALT'])
self.send_packet(_radio_id, 'RPTACK'+_salt_str)
self._clients[_radio_id]['CONNECTION'] = 'CHALLENGE_SENT'
logger.info('(%s) Sent Challenge Response to %s for login: %s', self._master, int_id(_radio_id), self._clients[_radio_id]['SALT'])
else:
self.transport.write('MSTNAK'+_radio_id, (_host, _port))
logger.warning('(%s) Invalid Login from Radio ID: %s', self._master, int_id(_radio_id))
elif _command == 'RPTK': # Repeater has answered our login challenge
_radio_id = _data[4:8]
if _radio_id in self._clients \
and self._clients[_radio_id]['CONNECTION'] == 'CHALLENGE_SENT' \
and self._clients[_radio_id]['IP'] == _host \
and self._clients[_radio_id]['PORT'] == _port:
_this_client = self._clients[_radio_id]
_this_client['LAST_PING'] = time()
_sent_hash = _data[8:]
_salt_str = hex_str_4(_this_client['SALT'])
_calc_hash = a(sha256(_salt_str+self._config['PASSPHRASE']).hexdigest())
if _sent_hash == _calc_hash:
_this_client['CONNECTION'] = 'WAITING_CONFIG'
self.send_packet(_radio_id, 'RPTACK'+_radio_id)
logger.info('(%s) Client %s has completed the login exchange successfully', self._master, _this_client['RADIO_ID'])
else:
logger.info('(%s) Client %s has FAILED the login exchange successfully', self._master, _this_client['RADIO_ID'])
self.transport.write('MSTNAK'+_radio_id, (_host, _port))
del self._clients[_radio_id]
else:
self.transport.write('MSTNAK'+_radio_id, (_host, _port))
logger.warning('(%s) Login challenge from Radio ID that has not logged in: %s', self._master, int_id(_radio_id))
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elif _command == 'RPTC': # Repeater is sending it's configuraiton OR disconnecting
if _data[:5] == 'RPTCL': # Disconnect command
_radio_id = _data[5:9]
if _radio_id in self._clients \
and self._clients[_radio_id]['CONNECTION'] == 'YES' \
and self._clients[_radio_id]['IP'] == _host \
and self._clients[_radio_id]['PORT'] == _port:
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logger.info('(%s) Client is closing down: %s', self._master, int_id(_radio_id))
self.transport.write('MSTNAK'+_radio_id, (_host, _port))
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del self._clients[_radio_id]
else:
_radio_id = _data[4:8] # Configure Command
if _radio_id in self._clients \
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and self._clients[_radio_id]['CONNECTION'] == 'WAITING_CONFIG' \
and self._clients[_radio_id]['IP'] == _host \
and self._clients[_radio_id]['PORT'] == _port:
_this_client = self._clients[_radio_id]
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_this_client['CONNECTION'] = 'YES'
_this_client['LAST_PING'] = time()
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_this_client['CALLSIGN'] = _data[8:16]
_this_client['RX_FREQ'] = _data[16:25]
_this_client['TX_FREQ'] = _data[25:34]
_this_client['TX_POWER'] = _data[34:36]
_this_client['COLORCODE'] = _data[36:38]
_this_client['LATITUDE'] = _data[38:47]
_this_client['LONGITUDE'] = _data[47:57]
_this_client['HEIGHT'] = _data[57:60]
_this_client['LOCATION'] = _data[60:80]
_this_client['DESCRIPTION'] = _data[80:99]
_this_client['SLOTS'] = _data[99:100]
_this_client['URL'] = _data[100:224]
_this_client['SOFTWARE_ID'] = _data[224:264]
_this_client['PACKAGE_ID'] = _data[264:304]
self.send_packet(_radio_id, 'RPTACK'+_radio_id)
logger.info('(%s) Client %s has sent repeater configuration', self._master, _this_client['RADIO_ID'])
else:
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, int_id(_radio_id))
elif _command == 'RPTP': # RPTPing -- client is pinging us
_radio_id = _data[7:11]
if _radio_id in self._clients \
and self._clients[_radio_id]['CONNECTION'] == "YES" \
and self._clients[_radio_id]['IP'] == _host \
and self._clients[_radio_id]['PORT'] == _port:
self._clients[_radio_id]['LAST_PING'] = time()
self.send_packet(_radio_id, 'MSTPONG'+_radio_id)
logger.debug('(%s) Received and answered RPTPING from client %s', self._master, int_id(_radio_id))
else:
self.transport.write('MSTNAK'+_radio_id, (_host, _port))
logger.warning('(%s) Client info from Radio ID that has not logged in: %s', self._master, int_id(_radio_id))
else:
logger.error('(%s) Unrecognized command from: %s. Packet: %s', self._master, int_id(_radio_id), h(_data))
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#************************************************
# HB CLIENT CLASS
#************************************************
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class HBCLIENT(DatagramProtocol):
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def __init__(self, *args, **kwargs):
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if len(args) == 1:
self._client = args[0]
self._config = CONFIG['CLIENTS'][self._client]
self._stats = self._config['STATS']
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# Configure for AMBE audio export if enabled
if self._config['EXPORT_AMBE']:
self._ambe = AMBE()
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else:
# If we didn't get called correctly, log it!
logger.error('(%s) HBCLIENT was not called with an argument. Terminating', self._client)
sys.exit()
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def startProtocol(self):
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# Set up periodic loop for sending pings to the master. Run every 'PING_TIME' seconds
self._client_maintenance = task.LoopingCall(self.client_maintenance_loop)
self._client_maintenance_loop = self._client_maintenance.start(CONFIG['GLOBAL']['PING_TIME'])
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def client_maintenance_loop(self):
logger.debug('(%s) Client maintenance loop started', self._client)
# If we're not connected, zero out the stats and send a login request RPTL
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if self._stats['CONNECTION'] == 'NO' or self._stats['CONNECTION'] == 'RTPL_SENT':
self._stats['PINGS_SENT'] = 0
self._stats['PINGS_ACKD'] = 0
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self._stats['CONNECTION'] = 'RTPL_SENT'
self.send_packet('RPTL'+self._config['RADIO_ID'])
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logger.info('(%s) Sending login request to master %s:%s', self._client, self._config['MASTER_IP'], self._config['MASTER_PORT'])
# If we are connected, sent a ping to the master and increment the counter
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if self._stats['CONNECTION'] == 'YES':
self.send_packet('RPTPING'+self._config['RADIO_ID'])
self._stats['PINGS_SENT'] += 1
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logger.debug('(%s) RPTPING Sent to Master. Pings Since Connected: %s', self._client, self._stats['PINGS_SENT'])
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def send_packet(self, _packet):
self.transport.write(_packet, (self._config['MASTER_IP'], self._config['MASTER_PORT']))
# KEEP THE FOLLOWING COMMENTED OUT UNLESS YOU'RE DEBUGGING DEEPLY!!!!
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#logger.debug('(%s) TX Packet to %s:%s -- %s', self._client, self._config['MASTER_IP'], self._config['MASTER_PORT'], h(_packet))
def dmrd_received(self, _radio_id, _rf_src, _dst_id, _seq, _data):
pass
def datagramReceived(self, _data, (_host, _port)):
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# Keep This Line Commented Unless HEAVILY Debugging!
# logger.debug('(%s) RX packet from %s:%s -- %s', self._client, _host, _port, h(_data))
# Validate that we receveived this packet from the master - security check!
if self._config['MASTER_IP'] == _host and self._config['MASTER_PORT'] == _port:
# Extract the command, which is various length, but only 4 significant characters
_command = _data[:4]
if _command == 'DMRD': # DMRData -- encapsulated DMR data frame
_radio_id = _data[11:15]
if _radio_id == self._config['RADIO_ID']: # Validate the source and intended target
_seq = _data[4:5]
_rf_src = _data[5:8]
_dst_id = _data[8:11]
logger.debug('(%s) DMRD - Seqence: %s, RF Source: %s, Destination ID: %s', self._client, h(_seq), int_id(_rf_src), int_id(_dst_id))
# If AMBE audio exporting is configured...
if self._config['EXPORT_AMBE']:
self._ambe.parseAMBE(self._client, _data)
# Userland actions -- typically this is the function you subclass for an application
self.dmrd_received(_radio_id, _rf_src, _dst_id, _seq, _data)
elif _command == 'MSTN': # Actually MSTNAK -- a NACK from the master
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_radio_id = _data[4:8]
if _radio_id == self._config['RADIO_ID']: # Validate the source and intended target
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logger.warning('(%s) MSTNAK Received', self._client)
self._stats['CONNECTION'] = 'NO' # Disconnect ourselves and re-register
elif _command == 'RPTA': # Actually RPTACK -- an ACK from the master
# Depending on the state, an RPTACK means different things, in each clause, we check and/or set the state
if self._stats['CONNECTION'] == 'RTPL_SENT': # If we've sent a login request...
_login_int32 = _data[6:10]
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logger.info('(%s) Repeater Login ACK Received with 32bit ID: %s', self._client, int_id(_login_int32))
_pass_hash = sha256(_login_int32+self._config['PASSPHRASE']).hexdigest()
_pass_hash = a(_pass_hash)
self.send_packet('RPTK'+self._config['RADIO_ID']+_pass_hash)
self._stats['CONNECTION'] = 'AUTHENTICATED'
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 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)
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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
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logger.debug('(%s) MSTPONG Received. Pongs Since Connected: %s', self._client, self._stats['PINGS_ACKD'])
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))
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#************************************************
# MAIN PROGRAM LOOP STARTS HERE
#************************************************
if __name__ == '__main__':
logger.info('HBlink \'HBlink.py\' (c) 2016 N0MJS & the K0USY Group - SYSTEM STARTING...')
# HBlink Master
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for master in CONFIG['MASTERS']:
if CONFIG['MASTERS'][master]['ENABLED']:
masters[master] = HBMASTER(master)
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reactor.listenUDP(CONFIG['MASTERS'][master]['PORT'], masters[master], interface=CONFIG['MASTERS'][master]['IP'])
logger.debug('MASTER instance created: %s, %s', master, masters[master])
# HBlink Client
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for client in CONFIG['CLIENTS']:
if CONFIG['CLIENTS'][client]['ENABLED']:
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clients[client] = HBCLIENT(client)
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reactor.listenUDP(CONFIG['CLIENTS'][client]['PORT'], clients[client], interface=CONFIG['CLIENTS'][client]['IP'])
logger.debug('CLIENT instance created: %s, %s', client, clients[client])
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reactor.run()