DMRlink/ipsc.py

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2013-06-27 17:15:54 -04:00
from __future__ import print_function
from twisted.internet.protocol import DatagramProtocol
from twisted.internet import reactor
from twisted.internet import task
import argparse
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import binascii
import hmac
import hashlib
# Data structure for holding IPSC information
NETWORK = {
'IPSC1': {
'LOCAL': {
'DESCRIPTION': 'IPSC Network #1',
'MODE': b'\x6A',
'FLAGS': b'\x00\x00\x80\xDC',
'PORT': 50001,
'RADIO_ID': binascii.unhexlify('00000001'),
'AUTH_KEY': binascii.unhexlify('0000000000000000000000000000000000000001')
},
'MASTER': {
'IP': '1.1.1.1',
'MODE': b'\x6A',
'PORT': 50000,
'RADIO_ID': '',
},
'PEERS': [ # each list entry will be a dictionary for IP, RADIO ID and PORT
#{'IP': '100.200.1.1', 'PORT': 50000, 'RADIO_ID': b'\x00\x00\x00\xFF'},
]
},
'IPSC2': {
'LOCAL': {
'DESCRIPTION': 'IPSC Network #1',
'MODE': b'\x6A',
'FLAGS': b'\x00\x00\x80\xDC',
'PORT': 50002,
'RADIO_ID': binascii.unhexlify('00000002'),
'AUTH_KEY': binascii.unhexlify('0000000000000000000000000000000000000022')
},
'MASTER': {
'IP': '2.2.2.2',
'MODE': b'\x6A',
'PORT': 50000,
'RADIO_ID': '',
},
'PEERS': [ # each list entry will be a dictionary for IP, RADIO ID and PORT
#{'IP': '100.200.1.1', 'PORT': 50000, 'RADIO_ID': b'\x00\x00\x00\xFF'},
]
},
'IPSC3': {
'LOCAL': {
'DESCRIPTION': 'IPSC Network #1',
'MODE': b'\x6A',
'FLAGS': b'\x00\x00\x80\xDC',
'PORT': 50003,
'RADIO_ID': binascii.unhexlify('00000003'),
'AUTH_KEY': binascii.unhexlify('0000000000000000000000000000000000000333')
},
'MASTER': {
'IP': '3.3.3.3',
'MODE': b'\x6A',
'PORT': 50000,
'RADIO_ID': '',
},
'PEERS': [ # each list entry will be a dictionary for IP, RADIO ID and PORT
#{'IP': '100.200.1.1', 'PORT': 50000, 'RADIO_ID': b'\x00\x00\x00\xFF'},
]
},
'IPSC4': {
'LOCAL': {
'DESCRIPTION': 'IPSC Network #1',
'MODE': b'\x6A',
'FLAGS': b'\x00\x00\x80\xDC',
'PORT': 50004,
'RADIO_ID': binascii.unhexlify('00000004'),
'AUTH_KEY': binascii.unhexlify('0000000000000000000000000000000000004444')
},
'MASTER': {
'IP': '4.4.4.4',
'MODE': b'\x6A',
'PORT': 50000,
'RADIO_ID': '',
},
'PEERS': [ # each list entry will be a dictionary for IP, RADIO ID and PORT
#{'IP': '100.200.1.1', 'PORT': 50000, 'RADIO_ID': b'\x00\x00\x00\xFF'},
]
}
}
# Known IPSC Message Types
RDAC_CTL = b'\x70'
GROUP_VOICE = b'\x80'
GROUP_DATA = b'\x83'
PVT_DATA = b'\x84'
RPT_WAKE_UP = b'\x85'
MASTER_REG_REQ = b'\x90' # FROM peer TO master
MASTER_REG_REPLY = b'\x91' # FROM master TO peer
PEER_LIST_REQ = b'\x92'
PEER_LIST_REPLY = b'\x93'
PEER_REG_REQUEST = b'\x94' # Peer registration request
PEER_REG_REPLY = b'\x95' # Peer registration reply
MASTER_ALIVE_REQ = b'\x96' # FROM peer TO master
MASTER_ALIVE_REPLY = b'\x97' # FROM master TO peer
PEER_ALIVE_REQ = b'\x98' # Peer keep alive request
PEER_ALIVE_REPLY = b'\x99' # Peer keep alive reply
# IPSC Version Information
IPSC_OP_VER = b'\x04\x03' # 0x04, 0x03 -- seems to be current version of IPSC
IPSC_OLD_VER = b'\x04\x00' # 0x04, 0x02 -- oldest version of IPSC suppoerted
IPSC_VER = IPSC_OP_VER + IPSC_OLD_VER
def hashed_packet(key, data):
hash = binascii.unhexlify((hmac.new(key,data,hashlib.sha1)).hexdigest()[:20])
return (data + hash)
def print_peer_list(_ipsc_network):
print('\t', _ipsc_network['LOCAL']['DESCRIPTION'])
for dictionary in _ipsc_network['PEERS']:
hex_address = dictionary['IP']
hex_port = dictionary['PORT']
hex_radio_id = dictionary['RADIO_ID']
hex_mode = dictionary['MODE']
address = [int(hex_address[0:2], 16), int(hex_address[2:4], 16), int(hex_address[4:6], 16), int(hex_address[6:8], 16)]
port = int(hex_port, 16)
radio_id = int(hex_radio_id, 16)
print ('\t', address[0],address[1],address[2],address[3], sep='.', end='\t')
print (port, radio_id, sep=':', end=' ')
print ("IPSC Mode:", hex_mode)
print()
class IPSC(DatagramProtocol):
def __init__(self, *args, **kwargs):
if len(args) == 1:
self._config = args[0]
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_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)
else:
print("Unexpected arguments found.")
def masterKeepalive(self):
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']))
print("->> Master Keep Alive Sent To:\t", self._config['MASTER']['IP'],":", self._config['MASTER']['PORT'], "\n")
def startProtocol(self):
print ("*** config: %s" % self._config)
print ()
print ("*** Starting up IPSC Client and Registering to the Master ***")
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']))
print ("->> Sending Registration to Master:\t", self._config['MASTER']['IP'],":", self._config['MASTER']['PORT'],
"\tFrom:", binascii.b2a_hex(self._config['LOCAL']['RADIO_ID']), "\n")
#
self._call = task.LoopingCall(self.masterKeepalive)
self._loop = self._call.start(6)
def datagramReceived(self, data, (host, port)):
dest_ip = self._config['MASTER']['IP']
dest_port = self._config['MASTER']['PORT']
#print "received %r from %s:%d" % (binascii.b2a_hex(data), host, port)
_packettype = (data[0:1])
if (_packettype == MASTER_REG_REQ):
print("<<- Registration Packet Recieved\n")
elif (_packettype == MASTER_REG_REPLY):
print("<<- Master Registration Reply From:\t", host,":",port)
master_alive_packet = hashed_packet(self._config['LOCAL']['AUTH_KEY'], self.MASTER_ALIVE_PKT)
self.transport.write(master_alive_packet, (host, port))
print("->> Master Keep Alive Sent To:\t", host,":",port, "\n")
# the only time we need to ask for the peer list is after we've registered to the master
peer_list_req_packet = hashed_packet(self._config['LOCAL']['AUTH_KEY'], self.PEER_LIST_REQ_PKT)
self.transport.write(peer_list_req_packet, (host, port))
print("->> Peer List Reqested from Master:\t", host,":",port, "\n")
#print binascii.b2a_hex(peer_list_req_packet)
elif (_packettype == PEER_REG_REQUEST):
print("<<- Peer Registration Request From:\t", 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))
print("->> Peer Registration Reply Sent To:\t", host,":",port,"\n")
#print host, port
#print binascii.b2a_hex(peer_reg_reply_packet)
elif (_packettype == PEER_ALIVE_REQ):
print("<<- Received Peer Keep Alive From:\t", host,":",port)
peer_alive_req_packet = hashed_packet(self._config['LOCAL']['AUTH_KEY'], self.PEER_ALIVE_REQ_PKT)
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))
print("->> Sent Peer Keep Alive Reply To:\t\t", host,":",port,)
self.transport.write(peer_alive_req_packet, (host, port))
print("->> Sent Peer Keep Alive Request To:\t\t", host,":",port, "\n")
#print binascii.b2a_hex(peer_alive_req_packet)
elif (_packettype == MASTER_ALIVE_REPLY):
print("<<- Keep Alive Recieved from Master:\t", host,":",port, "\n")
elif (_packettype == PEER_ALIVE_REPLY):
print("<<- Keep Alive Recieved from Peer:\t", host,":",port, "\n")
elif (_packettype == RDAC_CTL):
print("<<- RDAC and/or Control Packet From:\t", host,":",port, "\n")
elif (_packettype == PEER_LIST_REPLY):
print("<<- The Peer List has been Received from Master:\t", host,":",port)
_num_peers = int(str(int(binascii.b2a_hex(data[5:7]), 16))[1:])
print(' There are', _num_peers, 'peers in this IPSC Network')
for i in range(7, (_num_peers*11)+7, 11):
self._config['PEERS'].append({
'RADIO_ID': binascii.b2a_hex(data[i:i+4]),
'IP': binascii.b2a_hex(data[i+4:i+8]),
'PORT': binascii.b2a_hex(data[i+8:i+10]),
'MODE': binascii.b2a_hex(data[i+10:i+11])
})
print_peer_list(self._config)
print()
else:
packet_type = binascii.b2a_hex(_packettype)
print("<<- Recieved Unprocessed Type", packet_type, "From:\t", host,":",port,"\n")
if __name__ == '__main__':
parser = argparse.ArgumentParser(description="Start an IPSC client.")
parser.add_argument('-n', '--network', required=False)
args = parser.parse_args()
if args.network is not None:
if args.network in NETWORK:
print("Connecting to %s" % args.network)
reactor.listenUDP(NETWORK[args.network]['LOCAL']['PORT'], IPSC(NETWORK[args.network]))
else:
print("%s is not a configured ISPC network." % args.network)
exit()
else: # connect to all
print("No network supplied, connecting to all networks.")
for ipsc_network in NETWORK:
reactor.listenUDP(NETWORK[ipsc_network]['LOCAL']['PORT'], IPSC(NETWORK[ipsc_network]))
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reactor.run()