Updating packet types
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Cort Buffington
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158
README.md
158
README.md
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@ -30,14 +30,18 @@ The following sections of this document will include various packet types. This
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GROUP_VOICE = 0x80 This is a group voice call
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GROUP_DATA = 0x83 This is a group data call
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PVT_DATA = 0x84 This is a private data call
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REG_REQ = 0x90 Request registration with master
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REG_REPLY = 0x91 Master registration request reply
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RPT_WAKE_UP = 0x85 Wakes up all repeaters on the IPSC
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MASTER_REG_REQ = 0x90 Request registration with master (from peer, to master)
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MASTER_REG_REPLY = 0x91 Master registration request reply (from master, to peer)
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PEER_LIST_REQ = 0x92 Request peer list from master
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PEER_LIST_REPLY = 0x93 Master peer list reply
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PEER_KEEP_ALIVE_REQ = 0x94 Peer keep alive request
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PEER_KEEP_ALIVE_REPLY = 0x95 Peer keep alive response
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KEEP_ALIVE_REQ = 0x96 Master keep alive request (to master)
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KEEP_ALIVE_REPLY = 0x97 Master keep alive reply (from master)
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PEER_REG_REQ = 0x94 Peer registration request
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PEER_REG_REPLY = 0x95 Peer registration response
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MASTER_ALIVE_REQ = 0x96 Master keep alive request (to master)
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MASTER_ALIVE_REPLY = 0x97 Master keep alive reply (from master)
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PEER_ALIVE_REQ = 0x98 Peer keep alive request (to peer)
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PEER_ALIVE_REPLY = 0x99 Peer keep alive reply (from peer)
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**AUTHENTICATION:**
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@ -63,7 +67,7 @@ The IPSC network truly "forms" when the first peer registers with the master. Al
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* Master updates the peer list to all nodes when there is a change:
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MASTER -> (PEERS) (Master sends update list to each peer)
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PEERn -> NEW PEER (each peer 'n' sends keep alive requests to the new peer)
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...all peers begin registration and then keep-alives
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* ALL nodes continue sending/receiving keep alives to maintain the IPSC
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@ -146,143 +150,3 @@ Bytes 3-4 = 0x04, 0x00 = Oldest supported version? (same as above)
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FULL_PAYLOAD = add_authentication(PAYLOAD, KEY)
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print(binascii.b2a_hex(FULL_PAYLOAD))
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**Example Python3 code to register to a master, exchange keep alives, request, receive and decode the peer list:**
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import socket
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import binascii
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import hmac
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import hashlib
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# Data structure for holding IPSC information
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NETWORK = {
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'IPSC1': {
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'LOCAL': {
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'DESCRIPTION': 'IPSC Network #1',
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'MODE': b'\x6A',
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'FLAGS': b'\x00\x00\x80\xDC',
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'PORT': 50001,
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'RADIO_ID': binascii.unhexlify('00000001'),
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'AUTH_KEY': binascii.unhexlify('0000000000000000000000000000000000000001')
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},
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'MASTER': {
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'IP': '1.1.1.1',
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'MODE': b'\x6A',
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'PORT': 50000,
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'RADIO_ID': '',
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},
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'PEERS': [ # each list entry will be a dictionary for IP, RADIO ID and PORT
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#{'IP': '100.200.1.1', 'PORT': 50000, 'RADIO_ID': b'\x00\x00\x00\xFF'},
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]
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}
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}
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# Known IPSC Message Types
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RDAC_CTL = b'\x70'
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GROUP_VOICE = b'\x80'
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GROUP_DATA = b'\x83'
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PVT_DATA = b'\x84'
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REG_REQ = b'\x90'
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REG_REPLY = b'\x91'
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PEER_LIST_REQ = b'\x92'
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PEER_LIST_REPLY = b'\x93'
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PEER_KEEP_ALIVE_REQ = b'\x94'
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PEER_KEEP_ALIVE_REPLY = b'\x95'
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KEEP_ALIVE_REQ = b'\x96'
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KEEP_ALIVE_REPLY = b'\x97'
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# IPSC information
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IPSC_TS_BOTH = b'\x6A' # Both Timeslots IPSC enabled
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IPSC_OP_VER = b'\x04\x03' # 0x04, 0x03 -- seems to be current version of IPSC
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IPSC_OLD_VER = b'\x04\x00' # 0x04, 0x02 -- oldest version of IPSC suppoerted
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IPSC_FLAGS = b'\x00\x00\x80\xDC' # Just accept this... it works, we know some of the pieces
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#********** FUNCTIONS THAT WE WILL USE
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# function to send a payload to a defined socket
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def send_auth_packet (_dest_addr, _dest_port, _socket, _data, _key):
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_hash = binascii.unhexlify((hmac.new(_key,_data,hashlib.sha1)).hexdigest()[:20])
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print("==> Sending Authenticated Packet")
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print(" Destination IP:", _dest_addr)
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print(" Destination UDP Port:", _dest_port)
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print(" Raw Packet:", binascii.b2a_hex(_data + _hash))
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_socket.sendto((_data+_hash), (_dest_addr, _dest_port))
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return
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# Note: This function ignores authentication information!!!
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def receive_packet(_socket):
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_data = (_socket.recv(1024))
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_peer_id = str(int(binascii.b2a_hex(_data[2:5]), 16))
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_mode = binascii.b2a_hex(_data[5:6])
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print('<== Response Recieved from Radio ID:', _peer_id)
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print(' Raw Packet:', binascii.b2a_hex(_data))
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# Parse returned information
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_packettype = (_data[0:1])
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_sock = 'IPSC1'
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if (_packettype == REG_REQ):
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print(" >> This is a registration packet")
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elif (_packettype == REG_REPLY):
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print(" >> This is a registration reply packet")
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elif (_packettype == PEER_LIST_REPLY):
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print(">> This packet is a peer list from the master")
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_num_peers = int(str(int(binascii.b2a_hex(_data[5:7]), 16))[1:])
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# print('>>There are', binascii.b2a_hex(_data[5:7]), 'peers in this IPSC (RAW)')
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print('>> There are', _num_peers, 'peers in this IPSC')
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for i in range(7, (_num_peers*11)+7, 11):
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NETWORK[_sock]['PEERS'].append({
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'RADIO_ID': binascii.b2a_hex(_data[i:i+4]),
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'IP': binascii.b2a_hex(_data[i+4:i+8]),
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'PORT': binascii.b2a_hex(_data[i+8:i+10]),
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'MODE': binascii.b2a_hex(_data[i+10:i+11])
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})
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print_peer_list('IPSC1')
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return _data, _packettype
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def print_peer_list(_ipsc_network):
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print(NETWORK[_ipsc_network]['LOCAL']['DESCRIPTION'])
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for dictionary in NETWORK[_ipsc_network]['PEERS']:
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hex_address = dictionary['IP']
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hex_port = dictionary['PORT']
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hex_radio_id = dictionary['RADIO_ID']
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hex_mode = dictionary['MODE']
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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)]
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port = int(hex_port, 16)
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radio_id = int(hex_radio_id, 16)
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print(address[0],".",address[1],".",address[2],".",address[3],"\t", sep='', end='')
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print(port, radio_id, hex_mode, sep='\t')
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return
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#********** THE ACTUAL MEAT
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# Create a socket to contact IPSC Network #1
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ipsc1_sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
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ipsc1_sock.bind(('', NETWORK['IPSC1']['LOCAL']['PORT']))
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ipsc1_sock.setblocking(0)
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ipsc1_sock.settimeout(60)
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CTL_SUFFIX = (IPSC_TS_BOTH + IPSC_FLAGS + IPSC_OP_VER + IPSC_OLD_VER)
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REG_REQ_PACKET = (REG_REQ + NETWORK['IPSC1']['LOCAL']['RADIO_ID'] + CTL_SUFFIX)
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KEEP_ALIVE_PACKET = (KEEP_ALIVE_REQ + NETWORK['IPSC1']['LOCAL']['RADIO_ID'] + CTL_SUFFIX)
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PEER_LIST_REQ_PACKET = (PEER_LIST_REQ + NETWORK['IPSC1']['LOCAL']['RADIO_ID'])
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# Send registration packet
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send_auth_packet(NETWORK['IPSC1']['MASTER']['IP'], NETWORK['IPSC1']['MASTER']['PORT'], ipsc1_sock, REG_REQ_PACKET, NETWORK['IPSC1']['LOCAL']['AUTH_KEY'])
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receive_packet(ipsc1_sock)
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# Send keep alive packet
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send_auth_packet(NETWORK['IPSC1']['MASTER']['IP'], NETWORK['IPSC1']['MASTER']['PORT'], ipsc1_sock, KEEP_ALIVE_PACKET, NETWORK['IPSC1']['LOCAL']['AUTH_KEY'])
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receive_packet(ipsc1_sock)
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# Request peer list from master
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send_auth_packet(NETWORK['IPSC1']['MASTER']['IP'], NETWORK['IPSC1']['MASTER']['PORT'], ipsc1_sock, PEER_LIST_REQ_PACKET, NETWORK['IPSC1']['LOCAL']['AUTH_KEY'])
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receive_packet(ipsc1_sock)
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ipsc1_sock.close
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