from __future__ import print_function from twisted.internet.protocol import DatagramProtocol from twisted.internet import reactor from twisted.internet import task import sys import argparse import binascii import hmac import hashlib import socket #from logging.config import dictConfig #import logging #************************************************ # IMPORTING OTHER FILES - '#include' #************************************************ # Import system logger configuration # try: from ipsc_logger import logger except ImportError: sys.exit('System logger configuraiton not found or invalid') # Import configuration and informational data structures # try: from my_ipsc_config import NETWORK except ImportError: sys.exit('Configuration file not found, or not valid formatting') # Import IPSC message types and version information # try: from ipsc_message_types import * except ImportError: sys.exit('IPSC message types file not found or invalid') # Import IPSC flag mask values # try: from ipsc_mask import * except ImportError: sys.exit('IPSC mask values file not found or invalid') #************************************************ # GLOBALLY SCOPED FUNCTIONS #************************************************ # Take a packet to be SENT, calcualte auth hash and return the whole thing # def hashed_packet(_key, _data): hash = binascii.unhexlify((hmac.new(_key,_data,hashlib.sha1)).hexdigest()[:20]) return (_data + hash) # Take a RECEIVED packet, calculate the auth hash and verify authenticity # def validate_auth(_key, _data): return # Decide the Mode bit flags and print them - later, use this for more # than just informational purposes, for now, it's FYI/Debug info. # def print_mode_decode(_mode): _mode = int(binascii.b2a_hex(_mode), 16) link_op = _mode & PEER_OP_MSK link_mode = _mode & PEER_MODE_MSK ts1 = _mode & IPSC_TS1_MSK ts2 = _mode & IPSC_TS2_MSK if link_op == 0b01000000: logger.info('\t\tPeer Operational') elif link_op == 0b00000000: logger.info('\t\tPeer Not Operational') else: logger.warning('\t\tPeer Mode Invalid') if link_mode == 0b00000000: logger.info('\t\tNo RF Interface') elif link_mode == 0b00010000: logger.info('\t\tRadio in Analog Mode') elif link_mode == 0b00100000: logger.info('\t\tRadio in Digital Mode') else: logger.warning('\t\tRadio Mode Invalid') if ts1 == 0b00001000: logger.info('\t\tIPSC Enabled on TS1') if ts2 == 0b00000010: logger.info('\t\tIPSC Enabled on TS2') # Gratuituous print-out of the peer list.. Pretty much debug stuff. # def print_peer_list(_network_name): logger.info('\t%s', _network_name) for dictionary in NETWORK[_network_name]['PEERS']: logger.info('\tIP Address: %s:%s', dictionary['IP'], dictionary['PORT']) logger.info('\tRADIO ID: %s ', int(binascii.b2a_hex(dictionary['RADIO_ID']), 16)) logger.info("\tIPSC Mode:") print_mode_decode(dictionary['RAW_MODE']) logger.info('\tConnection Status: %s', dictionary['STATUS']['CONNECTED']) logger.info('\tKeepAlives Missed: %s', dictionary['STATUS']['KEEP_ALIVES_MISSED']) logger.info("") #************************************************ #******** *********** #******** IPSC Network "Engine" *********** #******** *********** #************************************************ #************************************************ # INITIAL SETUP of IPSC INSTANCE #************************************************ class IPSC(DatagramProtocol): # Modify the initializer to set up our environment and build the packets # we need to maitain connections # def __init__(self, *args, **kwargs): if len(args) == 1: self._network_name = args[0] self._config = NETWORK[self._network_name] args = () self.TS_FLAGS = (self._config['LOCAL']['MODE'] + self._config['LOCAL']['FLAGS']) self.MASTER_REG_REQ_PKT = (MASTER_REG_REQ + self._config['LOCAL']['RADIO_ID'] + self.TS_FLAGS + IPSC_VER) self.MASTER_ALIVE_PKT = (MASTER_ALIVE_REQ + self._config['LOCAL']['RADIO_ID'] + self.TS_FLAGS + IPSC_VER) self.PEER_LIST_REQ_PKT = (PEER_LIST_REQ + self._config['LOCAL']['RADIO_ID']) self.PEER_REG_REQ_PKT = (PEER_REG_REQ + self._config['LOCAL']['RADIO_ID'] + IPSC_VER) self.PEER_REG_REPLY_PKT = (PEER_REG_REPLY + self._config['LOCAL']['RADIO_ID'] + IPSC_VER) self.PEER_ALIVE_REQ_PKT = (PEER_ALIVE_REQ + self._config['LOCAL']['RADIO_ID'] + self.TS_FLAGS) self.PEER_ALIVE_REPLY_PKT = (PEER_ALIVE_REPLY + self._config['LOCAL']['RADIO_ID'] + self.TS_FLAGS) self._peer_list_new = False else: logger.error("Unexpected arguments found.") # This is called by REACTOR when it starts, We use it to set up the timed # loop for each instance of the IPSC engine # def startProtocol(self): #logger.debug("*** config: %s", self._config) #logger.info("") self._call = task.LoopingCall(self.timed_loop) self._loop = self._call.start(self._config['LOCAL']['ALIVE_TIMER']) #************************************************ # FUNCTIONS FOR IPSC Network Engine #************************************************ # Process a received peer list: # Flag we have a list # Flag the list is new (needed elsewhere) # Populate the peer information from the list # def peer_list_received(self, _data, (_host, _port)): self._config['MASTER']['STATUS']['PEER-LIST'] = True self._peer_list_new = True logger.info("<<- The Peer List has been Received from Master:%s:%s ", _host, _port) _num_peers = int(str(int(binascii.b2a_hex(_data[5:7]), 16))[1:]) self._config['LOCAL']['NUM_PEERS'] = _num_peers logger.info(' There are %s peers in this IPSC Network', _num_peers) del self._config['PEERS'][:] for i in range(7, (_num_peers*11)+7, 11): hex_address = (_data[i+4:i+8]) self._config['PEERS'].append({ 'RADIO_ID': _data[i:i+4], 'IP': socket.inet_ntoa(hex_address), 'PORT': int(binascii.b2a_hex(_data[i+8:i+10]), 16), 'RAW_MODE': _data[i+10:i+11], 'STATUS': {'CONNECTED': 0, 'KEEP_ALIVES_MISSED': 0} }) print_peer_list(self._network_name) #************************************************ # TIMED LOOP - MY CONNECTION MAINTENANCE #************************************************ def timed_loop(self): print('timed loop started') # temporary debugging to make sure this part runs _master_connected = self._config['MASTER']['STATUS']['CONNECTED'] _master_alives_missed = self._config['MASTER']['STATUS']['KEEP_ALIVES_MISSED'] _peer_list_rx = self._config['MASTER']['STATUS']['PEER-LIST'] if (_master_connected == False): reg_packet = hashed_packet(self._config['LOCAL']['AUTH_KEY'], self.MASTER_REG_REQ_PKT) self.transport.write(reg_packet, (self._config['MASTER']['IP'], self._config['MASTER']['PORT'])) logger.info("->> Master Registration Request To:%s:%s From:%s", self._config['MASTER']['IP'], self._config['MASTER']['PORT'], binascii.b2a_hex(self._config['LOCAL']['RADIO_ID'])) elif (_master_connected == True): master_alive_packet = hashed_packet(self._config['LOCAL']['AUTH_KEY'], self.MASTER_ALIVE_PKT) self.transport.write(master_alive_packet, (self._config['MASTER']['IP'], self._config['MASTER']['PORT'])) logger.info("->> Master Keep-alive Sent To:%s:%s", self._config['MASTER']['IP'], self._config['MASTER']['PORT']) self._config['MASTER']['STATUS']['KEEP_ALIVES_SENT'] += 1 if (self._config['MASTER']['STATUS']['KEEP_ALIVES_OUTSTANDING']) > 0: self._config['MASTER']['STATUS']['KEEP_ALIVES_MISSED'] += 1 if self._config['MASTER']['STATUS']['KEEP_ALIVES_OUTSTANDING'] >= self._config['LOCAL']['MAX_MISSED']: pass self._config['MASTER']['STATUS']['CONNECTED'] = False logger.error('Maximum Master Keep-Alives Missed -- De-registering the Master') else: logger.error("->> Master in UNKOWN STATE:%s:%s", self._config['MASTER']['IP'], self._config['MASTER']['PORT']) if ((_master_connected == True) and (_peer_list_rx == False)): peer_list_req_packet = hashed_packet(self._config['LOCAL']['AUTH_KEY'], self.PEER_LIST_REQ_PKT) self.transport.write(peer_list_req_packet, (self._config['MASTER']['IP'], self._config['MASTER']['PORT'])) logger.info("->> List Reqested from Master:%s:%s", self._config['MASTER']['IP'], self._config['MASTER']['PORT']) # Logic problems in the next if.... bad ones. Fix them. if (self._peer_list_new == True): self._peer_list_new = False logger.info('*** NEW PEER LIST RECEIEVED - PROCESSING!') for peer in (self._config['PEERS']): if (peer['RADIO_ID'] == binascii.b2a_hex(self._config['LOCAL']['RADIO_ID'])): continue if peer['STATUS']['CONNECTED'] == 0: peer_reg_packet = hashed_packet(self._config['LOCAL']['AUTH_KEY'], self.PEER_REG_REQ_PKT) self.transport.write(peer_reg_packet, (peer['IP'], peer['PORT'])) logger.info('->> Peer Registration Request To:%s:%s From:%s', peer['IP'], peer['PORT'], binascii.b2a_hex(self._config['LOCAL']['RADIO_ID'])) elif peer['STATUS']['CONNECTED'] == 1: peer_alive_req_packet = hashed_packet(self._config['LOCAL']['AUTH_KEY'], self.PEER_ALIVE_REQ_PKT) self.transport.write(peer_reg_packet, (peer['IP'], peer['PORT'])) logger.info('->> Peer Keep-Alive Request To:%s:%s From:%s', peer['IP'], peer['PORT'], binascii.b2a_hex(self._config['LOCAL']['RADIO_ID'])) print('timed loop finished') # temporary debugging to make sure this part runs #************************************************ # RECEIVED DATAGRAM - ACT IMMEDIATELY!!! #************************************************ # Work in progress -- at the very least, notify we have the packet. Ultimately # call a function or process immediately if only a few actions # def datagramReceived(self, data, (host, port)): print('datagram received') # temporary debugging to make sure this part runs dest_ip = self._config['MASTER']['IP'] dest_port = self._config['MASTER']['PORT'] #logger.info("received %r from %s:%d", binascii.b2a_hex(data), host, port) _packettype = data[0:1] _peerid = data[1:5] if (_packettype == PEER_ALIVE_REQ): logger.info("<<- Peer Keep-alive Request From Peer ID %s at:%s:%s", int(binascii.b2a_hex(_peerid), 16), host, port) peer_alive_reply_packet = hashed_packet(self._config['LOCAL']['AUTH_KEY'], self.PEER_ALIVE_REPLY_PKT) self.transport.write(peer_alive_reply_packet, (host, port)) logger.info("->> Peer Keep-alive Reply sent To:%s:%s", host, port) elif (_packettype == MASTER_ALIVE_REPLY): logger.info("<<- Master Keep-alive Reply From:%s:%s", host, port) elif (_packettype == PEER_ALIVE_REPLY): self.config['MASTER']['STATUS']['KEEP_ALIVES_OUTSTANDING'] = 0 logger.info("<<- Peer Keep-alive Reply From:%s:%s", host, port) elif (_packettype == MASTER_REG_REQ): logger.info("<<- Registration Packet Recieved") elif (_packettype == MASTER_REG_REPLY): self._config['MASTER']['STATUS']['CONNECTED'] = True self._config['MASTER']['STATUS']['KEEP_ALIVES_OUTSTANDING'] = 0 logger.info("<<- Master Registration Reply From:%s:%s ", host, port) elif (_packettype == PEER_REG_REQ): logger.info("<<- Peer Registration Request From Peer ID %s at:%s:%s", int(binascii.b2a_hex(_peerid), 16), host, port) peer_reg_reply_packet = hashed_packet(self._config['LOCAL']['AUTH_KEY'], self.PEER_REG_REPLY_PKT) self.transport.write(peer_reg_reply_packet, (host, port)) logger.warning("->> Peer Registration Reply Sent To:%s:%s", host, port) elif (_packettype == PEER_REG_REPLY): logger.warning('<<- Peer Registration Reply From: %s', int(binascii.b2a_hex(_peerid), 16)) elif (_packettype == XCMP_XNL): logger.info("<<- XCMP_XNL From:%s:%s, but we did not indicate XCMP capable!", host, port) elif (_packettype == PEER_LIST_REPLY): self.peer_list_received(data, (host, port)) elif (_packettype == GROUP_VOICE): logger.info("<<- Group Voice Packet From:%s:%s", host, port) elif (_packettype == PVT_VOICE): logger.info("<<- Voice Packet From:%s:%s", host, port) elif (_packettype == GROUP_DATA): logger.info("<<- Group Data Packet From:%s:%s", host, port) elif (_packettype == PVT_DATA): logger.info("<<- Private Data Packet From From:%s:%s", host, port) elif (_packettype == RPT_WAKE_UP): logger.warning("<<- Repeater Wake-Up Packet From:%s:%s", host, port) elif (_packettype == DE_REG_REQ): logger.warning("<<- Peer De-Registration Request From:%s:%s", host, port) elif (_packettype == DE_REG_REPLY): logger.info("<<- Peer De-Registration Reply From:%s:%s", host, port) elif (_packettype in (CALL_CTL_1, CALL_CTL_2, CALL_CTL_3)): logger.info("<<- Call Control Packet From:%s:%s", host, port) else: packet_type = binascii.b2a_hex(_packettype) logger.error("<<- Received Unprocessed Type %s From:%s:%s", packet_type, host, port) #************************************************ # MAIN PROGRAM LOOP STARTS HERE #************************************************ if __name__ == '__main__': logger.info('SYSTEM STARTING UP') for ipsc_network in NETWORK: reactor.listenUDP(NETWORK[ipsc_network]['LOCAL']['PORT'], IPSC(ipsc_network)) reactor.run()