916ed46fef
Incorrect decodeing of determination of the peer-list. As it turns out, the packet indicates the length of the list, not the number of peers. So, take that value / 11 (length of a peer entry) for the number of peers. Thanks to Hans for pointing this out!
544 lines
24 KiB
Python
544 lines
24 KiB
Python
# Copyright (c) 2013 Cortney T. Buffington, N0MJS n0mjs@me.com
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#
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# This work is licensed under the Creative Commons Attribution-ShareAlike
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# 3.0 Unported License.To view a copy of this license, visit
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# http://creativecommons.org/licenses/by-sa/3.0/ or send a letter to
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# Creative Commons, 444 Castro Street, Suite 900, Mountain View,
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# California, 94041, USA.
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from __future__ import print_function
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from twisted.internet.protocol import DatagramProtocol
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from twisted.internet import reactor
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from twisted.internet import task
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import sys
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import argparse
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import binascii
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import hmac
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import hashlib
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import socket
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#************************************************
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# IMPORTING OTHER FILES - '#include'
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#************************************************
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# Import system logger configuration
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#
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try:
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from ipsc_logger import logger
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except ImportError:
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sys.exit('System logger configuraiton not found or invalid')
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# Import configuration and informational data structures
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#
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try:
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from my_ipsc_config import NETWORK
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except ImportError:
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sys.exit('Configuration file not found, or not valid formatting')
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# Import IPSC message types and version information
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#
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try:
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from ipsc_message_types import *
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except ImportError:
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sys.exit('IPSC message types file not found or invalid')
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# Import IPSC flag mask values
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#
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try:
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from ipsc_mask import *
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except ImportError:
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sys.exit('IPSC mask values file not found or invalid')
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#************************************************
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# GLOBALLY SCOPED FUNCTIONS
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#************************************************
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# Remove the hash from a paket and return the payload
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#
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def strip_hash(_data):
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# _log = logger.debug
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return _data[:-10]
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# Determine if the provided peer ID is valid for the provided network
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#
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def valid_peer(_peer_list, _peerid):
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# _log = logger.debug
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if _peerid in _peer_list:
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return True
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return False
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# Determine if the provided master ID is valid for the provided network
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#
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def valid_master(_network, _peerid):
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# _log = logger.debug
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if NETWORK[_network]['MASTER']['RADIO_ID'] == _peerid:
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return True
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else:
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return False
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# Take a packet to be SENT, calcualte auth hash and return the whole thing
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#
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def hashed_packet(_key, _data):
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# _log = logger.debug
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_hash = binascii.a2b_hex((hmac.new(_key,_data,hashlib.sha1)).hexdigest()[:20])
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return (_data + _hash)
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# Take a RECEIVED packet, calculate the auth hash and verify authenticity
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#
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def validate_auth(_key, _data):
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# _log = logger.debug
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_payload = strip_hash(_data)
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_hash = _data[-10:]
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_chk_hash = binascii.a2b_hex((hmac.new(_key,_payload,hashlib.sha1)).hexdigest()[:20])
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if _chk_hash == _hash:
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# _log(' AUTH: Valid - Payload: %s, Hash: %s', binascii.b2a_hex(_payload), binascii.b2a_hex(_hash))
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return True
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else:
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# _log(' AUTH: Invalid - Payload: %s, Hash: %s', binascii.b2a_hex(_payload), binascii.b2a_hex(_hash))
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return False
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# Forward Group Voice Packet
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#
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def fwd_group_voice(_network, _data):
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# _log = logger.debug
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_src_group = _data[9:12]
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_src_ipsc = _data[1:5]
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for source in NETWORK[_network]['RULES']['GROUP_VOICE']:
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# Matching for rules is against the Destination Group in the SOURCE packet (SRC_GROUP)
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if source['SRC_GROUP'] == _src_group:
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_target = source['DST_NET']
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_target_sock = NETWORK[_target]['MASTER']['IP'], NETWORK[_target]['MASTER']['PORT']
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# Re-Write the IPSC SRC to match the target network's ID
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_data = _data.replace(_src_ipsc, NETWORK[_target]['LOCAL']['RADIO_ID'])
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# Re-Write the destinaion Group ID
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_data = _data.replace(_src_group, source['DST_GROUP'])
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# Calculate and append the authentication hash for the target network... if necessary
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if NETWORK[_target]['LOCAL']['AUTH_KEY'] == True:
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_data = hashed_packet(NETWORK[_target]['LOCAL']['AUTH_KEY'], _data)
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# Send the packet to all peers in the target IPSC
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send_to_ipsc(_target, _data)
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# Accept a complete packet, ready to be sent, and send it to all active peers + master in an IPSC
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#
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def send_to_ipsc(_target, _packet):
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# _log = logger.debug
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# Send to the Master
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networks[_target].transport.write(_packet, (NETWORK[_target]['MASTER']['IP'], NETWORK[_target]['MASTER']['PORT']))
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# Send to each connected Peer
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for peer in NETWORK[_target]['PEERS']:
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if peer['STATUS']['CONNECTED'] == True:
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networks[_target].transport.write(_packet, (peer['IP'], peer['PORT']))
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# De-register a peer from an IPSC by removing it's infomation
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#
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def de_register_peer(_network, _peerid):
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# _log = logger.debug
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# Iterate for the peer in our data
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for peer in NETWORK[_network]['PEERS']:
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# If we find the peer, remove it (we should find it)
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if _peerid == peer['RADIO_ID']:
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NETWORK[_network]['PEERS'].remove(peer)
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# Take a recieved peer list and the network it belongs to, process and populate the
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# data structure in my_ipsc_config with the results, and return a simple list of peers.
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#
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def process_peer_list(_data, _network, _peer_list):
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# _log = logger.debug
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# Set the status flag to indicate we have recieved a Peer List
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NETWORK[_network]['MASTER']['STATUS']['PEER-LIST'] = True
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# Determine the length of the peer list for the parsing iterator
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_peer_list_length = int(binascii.b2a_hex(_data[5:7]), 16)
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# Record the number of peers in the data structure... we'll use it later (11 bytes per peer entry)
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NETWORK[_network]['LOCAL']['NUM_PEERS'] = _peer_list_length/11
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# _log('<<- (%s) The Peer List has been Received from Master\n%s There are %s peers in this IPSC Network', _network, (' '*(len(_network)+7)), _num_peers)
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# Iterate each peer entry in the peer list. Skip the header, then pull the next peer, the next, etc.
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for i in range(7, (_peer_list_length)+7, 11):
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# Extract various elements from each entry...
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_hex_radio_id = (_data[i:i+4])
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_hex_address = (_data[i+4:i+8])
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_ip_address = socket.inet_ntoa(_hex_address)
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_hex_port = (_data[i+8:i+10])
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_port = int(binascii.b2a_hex(_hex_port), 16)
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_hex_mode = (_data[i+10:i+11])
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_mode = int(binascii.b2a_hex(_hex_mode), 16)
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# mask individual Mode parameters
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_link_op = _mode & PEER_OP_MSK
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_link_mode = _mode & PEER_MODE_MSK
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_ts1 = _mode & IPSC_TS1_MSK
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_ts2 = _mode & IPSC_TS2_MSK
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# Determine whether or not the peer is operational
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if _link_op == 0b01000000:
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_peer_op = True
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else:
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_peer_op = False
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# Determine the operational mode of the peer
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if _link_mode == 0b00000000:
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_peer_mode = 'NO_RADIO'
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elif _link_mode == 0b00010000:
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_peer_mode = 'ANALOG'
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elif _link_mode == 0b00100000:
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_peer_mode = 'DIGITAL'
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else:
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_peer_node = 'NO_RADIO'
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# Determine whether or not timeslot 1 is linked
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if _ts1 == 0b00001000:
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_ts1 = True
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else:
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_ts1 = False
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# Determine whether or not timeslot 2 is linked
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if _ts2 == 0b00000010:
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_ts2 = True
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else:
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_ts2 = False
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# If this entry was NOT already in our list, add it.
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if _hex_radio_id not in _peer_list:
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_peer_list.append(_hex_radio_id)
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NETWORK[_network]['PEERS'].append({
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'RADIO_ID': _hex_radio_id,
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'IP': _ip_address,
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'PORT': _port,
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'MODE': _hex_mode,
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'PEER_OPER': _peer_op,
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'PEER_MODE': _peer_mode,
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'TS1_LINK': _ts1,
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'TS2_LINK': _ts2,
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'STATUS': {'CONNECTED': False, 'KEEP_ALIVES_SENT': 0, 'KEEP_ALIVES_MISSED': 0, 'KEEP_ALIVES_OUTSTANDING': 0}
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})
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return _peer_list
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# Gratuituous print-out of the peer list.. Pretty much debug stuff.
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#
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def print_peer_list(_network):
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# _log = logger.info
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if not NETWORK[_network]['PEERS']:
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print('No peer list for: {}' .format(_network))
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return
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print('Peer List for: %s' % _network)
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for dictionary in NETWORK[_network]['PEERS']:
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if dictionary['RADIO_ID'] == NETWORK[_network]['LOCAL']['RADIO_ID']:
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me = '(self)'
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else:
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me = ''
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print('\tRADIO ID: {} {}' .format(int(binascii.b2a_hex(dictionary['RADIO_ID']), 16), me))
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print('\t\tIP Address: {}:{}' .format(dictionary['IP'], dictionary['PORT']))
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print('\t\tOperational: {}, Mode: {}, TS1 Link: {}, TS2 Link: {}' .format(dictionary['PEER_OPER'], dictionary['PEER_MODE'], dictionary['TS1_LINK'], dictionary['TS2_LINK']))
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print('\t\tStatus: {}, KeepAlives Sent: {}, KeepAlives Outstanding: {}, KeepAlives Missed: {}' .format(dictionary['STATUS']['CONNECTED'], dictionary['STATUS']['KEEP_ALIVES_SENT'], dictionary['STATUS']['KEEP_ALIVES_OUTSTANDING'], dictionary['STATUS']['KEEP_ALIVES_MISSED']))
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print('')
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#************************************************
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#******** ***********
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#******** IPSC Network 'Engine' ***********
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#******** ***********
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#************************************************
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#************************************************
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# INITIAL SETUP of IPSC INSTANCE
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#************************************************
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class IPSC(DatagramProtocol):
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# Modify the initializer to set up our environment and build the packets
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# we need to maitain connections
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#
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def __init__(self, *args, **kwargs):
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if len(args) == 1:
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# Housekeeping: create references to the configuration and status data for this IPSC instance.
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# Some configuration objects that are used frequently and have lengthy names are shortened
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# such as (self._master_sock) expands to (self._config['MASTER']['IP'], self._config['MASTER']['PORT']).
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# Note that many of them reference each other... this is the Pythonic way.
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#
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self._network = args[0]
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self._config = NETWORK[self._network]
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#
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self._local = self._config['LOCAL']
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self._local_stat = self._local['STATUS']
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self._local_id = self._local['RADIO_ID']
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#
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self._master = self._config['MASTER']
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self._master_stat = self._master['STATUS']
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self._master_sock = self._master['IP'], self._master['PORT']
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#
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self._peers = self._config['PEERS']
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#
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# This is a regular list to store peers for the IPSC. At times, parsing a simple list is much less
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# Spendy than iterating a list of dictionaries... Maybe I'll find a better way in the future. Also
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# We have to know when we have a new peer list, so a variable to indicate we do (or don't)
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#
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self._peer_list = []
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self._peer_list_new = False
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args = ()
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# Packet 'constructors' - builds the necessary control packets for this IPSC instance.
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# This isn't really necessary for anything other than readability (reduction of code golf)
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#
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self.TS_FLAGS = (self._local['MODE'] + self._local['FLAGS'])
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self.MASTER_REG_REQ_PKT = (MASTER_REG_REQ + self._local_id + self.TS_FLAGS + IPSC_VER)
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self.MASTER_ALIVE_PKT = (MASTER_ALIVE_REQ + self._local_id + self.TS_FLAGS + IPSC_VER)
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self.PEER_LIST_REQ_PKT = (PEER_LIST_REQ + self._local_id)
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self.PEER_REG_REQ_PKT = (PEER_REG_REQ + self._local_id + IPSC_VER)
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self.PEER_REG_REPLY_PKT = (PEER_REG_REPLY + self._local_id + IPSC_VER)
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self.PEER_ALIVE_REQ_PKT = (PEER_ALIVE_REQ + self._local_id + self.TS_FLAGS)
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self.PEER_ALIVE_REPLY_PKT = (PEER_ALIVE_REPLY + self._local_id + self.TS_FLAGS)
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else:
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# If we didn't get called correctly, log it!
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#
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logger.error('(%s) Unexpected arguments found.', self._network)
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# This is called by REACTOR when it starts, We use it to set up the timed
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# loop for each instance of the IPSC engine
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#
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def startProtocol(self):
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# Timed loop for IPSC connection establishment and maintenance
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# Others could be added later for things like updating a Web
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# page, etc....
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#
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self._call = task.LoopingCall(self.timed_loop)
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self._loop = self._call.start(self._local['ALIVE_TIMER'])
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#************************************************
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# FUNCTIONS FOR IPSC Network Engine
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#************************************************
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#************************************************
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# TIMED LOOP - MY CONNECTION MAINTENANCE
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#************************************************
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def timed_loop(self):
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# Right now, without this, we really dont' know anything is happening.
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print_peer_list(self._network)
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# If the master isn't connected, we have to do that before we can do anything else!
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if (self._master_stat['CONNECTED'] == False):
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reg_packet = hashed_packet(self._local['AUTH_KEY'], self.MASTER_REG_REQ_PKT)
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self.transport.write(reg_packet, (self._master_sock))
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# Once the master is connected, we have to send keep-alives.. and make sure we get them back
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elif (self._master_stat['CONNECTED'] == True):
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# Send keep-alive to the master
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master_alive_packet = hashed_packet(self._local['AUTH_KEY'], self.MASTER_ALIVE_PKT)
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self.transport.write(master_alive_packet, (self._master_sock))
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# If we had a keep-alive outstanding by the time we send another, mark it missed.
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if (self._master_stat['KEEP_ALIVES_OUTSTANDING']) > 0:
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self._master_stat['KEEP_ALIVES_MISSED'] += 1
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# If we have missed too many keep-alives, de-regiseter the master and start over.
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if self._master_stat['KEEP_ALIVES_OUTSTANDING'] >= self._local['MAX_MISSED']:
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self._master_stat['CONNECTED'] = False
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logger.error('Maximum Master Keep-Alives Missed -- De-registering the Master')
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# Update our stats before we move on...
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self._master_stat['KEEP_ALIVES_SENT'] += 1
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self._master_stat['KEEP_ALIVES_OUTSTANDING'] += 1
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else:
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# This is bad. If we get this message, probably need to restart the program.
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logger.error('->> (%s) Master in UNKOWN STATE:%s:%s', self._network, self._master_sock)
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# If the master is connected and we don't have a peer-list yet....
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if ((self._master_stat['CONNECTED'] == True) and (self._master_stat['PEER-LIST'] == False)):
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# Ask the master for a peer-list
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peer_list_req_packet = hashed_packet(self._local['AUTH_KEY'], self.PEER_LIST_REQ_PKT)
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self.transport.write(peer_list_req_packet, (self._master_sock))
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# If we do ahve a peer-list, we need to register with the peers and send keep-alives...
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if (self._master_stat['PEER-LIST'] == True):
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# Iterate the list of peers... so we do this for each one.
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for peer in (self._peers):
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# We will show up in the peer list, but shouldn't try to talk to ourselves.
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if (peer['RADIO_ID'] == self._local_id):
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continue
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# If we haven't registered to a peer, send a registration
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if peer['STATUS']['CONNECTED'] == False:
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peer_reg_packet = hashed_packet(self._local['AUTH_KEY'], self.PEER_REG_REQ_PKT)
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self.transport.write(peer_reg_packet, (peer['IP'], peer['PORT']))
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# If we have registered with the peer, then send a keep-alive
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elif peer['STATUS']['CONNECTED'] == True:
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peer_alive_req_packet = hashed_packet(self._local['AUTH_KEY'], self.PEER_ALIVE_REQ_PKT)
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self.transport.write(peer_alive_req_packet, (peer['IP'], peer['PORT']))
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# If we have a keep-alive outstanding by the time we send another, mark it missed.
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if peer['STATUS']['KEEP_ALIVES_OUTSTANDING'] > 0:
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peer['STATUS']['KEEP_ALIVES_MISSED'] += 1
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# If we have missed too many keep-alives, de-register the peer and start over.
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if peer['STATUS']['KEEP_ALIVES_OUTSTANDING'] >= self._local['MAX_MISSED']:
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peer['STATUS']['CONNECTED'] = False
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self._peer_list.remove(peer['RADIO_ID']) # Remove the peer from the simple list FIRST
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self._peers.remove(peer) # Becuase once it's out of the dictionary, you can't use it for anything else.
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logger.error('Maximum Peer Keep-Alives Missed -- De-registering the Peer: %s', peer)
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# Update our stats before moving on...
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peer['STATUS']['KEEP_ALIVES_SENT'] += 1
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peer['STATUS']['KEEP_ALIVES_OUTSTANDING'] += 1
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#************************************************
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# RECEIVED DATAGRAM - ACT IMMEDIATELY!!!
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#************************************************
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# Actions for recieved packets by type: For every packet recieved, there are some things that we need to do:
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# Decode some of the info
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# Check for auth and authenticate the packet
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# Strip the hash from the end... we don't need it anymore
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#
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# Once they're done, we move on to the proccessing or callbacks for each packet type.
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#
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def datagramReceived(self, data, (host, port)):
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_packettype = data[0:1]
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_peerid = data[1:5]
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_dec_peerid = int(binascii.b2a_hex(_peerid), 16)
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# First action: if Authentication is active, authenticate the packet
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#
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if bool(self._local['AUTH_KEY']) == True:
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# Validate
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if validate_auth(self._local['AUTH_KEY'], data) == False:
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logger.warning('(%s) AuthError: IPSC packet failed authentication. Type %s: Peer ID: %s', self._network, binascii.b2a_hex(_packettype), _dec_peerid)
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return
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# Strip the hash, we won't need it anymore
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data = strip_hash(data)
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# Packets generated by "users" that are the most common should come first for efficiency.
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#
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if (_packettype == GROUP_VOICE):
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# Don't take action unless it's from a valid peer (including the master, of course)
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if not(valid_master(self._network, _peerid) == False or valid_peer(self._peer_list, _peerid) == False):
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logger.warning('(%s) PeerError: Peer not in peer-list: %s', self._network, _dec_peerid)
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return
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# Group voice callback function
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fwd_group_voice(self._network, data)
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|
|
# IPSC keep alives, master and peer, come next in processing priority
|
|
#
|
|
elif (_packettype == PEER_ALIVE_REQ):
|
|
# We should not answer a keep-alive request from a peer we don't know about!
|
|
if valid_peer(self._peer_list, _peerid) == False:
|
|
logger.warning('(%s) PeerError: Peer %s not in peer-list: %s', self._network, _dec_peerid, self._peer_list)
|
|
return
|
|
|
|
# Generate a hashed paket from our template and send it.
|
|
peer_alive_reply_packet = hashed_packet(self._local['AUTH_KEY'], self.PEER_ALIVE_REPLY_PKT)
|
|
self.transport.write(peer_alive_reply_packet, (host, port))
|
|
|
|
elif (_packettype == MASTER_ALIVE_REPLY):
|
|
# We should not accept keep-alive reply from someone claming to be a master who isn't!
|
|
if valid_master(self._network, _peerid) == False:
|
|
logger.warning('(%s) PeerError: Peer %s not in peer-list: %s', self._network, _dec_peerid, self._peer_list)
|
|
return
|
|
|
|
# logger.debug('<<- (%s) Master Keep-alive Reply From: %s \t@ IP: %s:%s', self._network, _dec_peerid, host, port)
|
|
# This action is so simple, it doesn't require a callback function, master is responding, we're good.
|
|
self._master_stat['KEEP_ALIVES_OUTSTANDING'] = 0
|
|
|
|
elif (_packettype == PEER_ALIVE_REPLY):
|
|
# Find the peer in our list of peers...
|
|
for peer in self._config['PEERS']:
|
|
if peer['RADIO_ID'] == _peerid:
|
|
# No callback funcntion needed, set the outstanding keepalives to 0, and move on.
|
|
peer['STATUS']['KEEP_ALIVES_OUTSTANDING'] = 0
|
|
|
|
# Registration requests and replies are infrequent, but important. Peer lists can go here too as a part
|
|
# of the registration process.
|
|
#
|
|
elif (_packettype == MASTER_REG_REQ):
|
|
# We can't operate as a master as of now, so we should never receive one of these.
|
|
# logger.debug('<<- (%s) Master Registration Packet Recieved', self._network)
|
|
pass
|
|
|
|
# When we hear from the maseter, record it's ID, flag that we're connected, and reset the dead counter.
|
|
elif (_packettype == MASTER_REG_REPLY):
|
|
self._master['RADIO_ID'] = _peerid
|
|
self._master_stat['CONNECTED'] = True
|
|
self._master_stat['KEEP_ALIVES_OUTSTANDING'] = 0
|
|
|
|
# Answer a peer registration request -- simple, no callback runction needed
|
|
elif (_packettype == PEER_REG_REQ):
|
|
# TO DO TO DO TO DO TO DO ***ADD CODE TO VALIDATE THE PEER IS IN OUR PEER-LIST HERE***
|
|
# ***MAKE SURE WE CHECK TO SEE IF WE NEED TO MAKE AN AUTHENITCATED PACKET FIRST***
|
|
peer_reg_reply_packet = hashed_packet(self._local['AUTH_KEY'], self.PEER_REG_REPLY_PKT)
|
|
self.transport.write(peer_reg_reply_packet, (host, port))
|
|
|
|
elif (_packettype == PEER_REG_REPLY):
|
|
for peer in self._config['PEERS']:
|
|
if peer['RADIO_ID'] == _peerid:
|
|
peer['STATUS']['CONNECTED'] = True
|
|
|
|
elif (_packettype == PEER_LIST_REPLY):
|
|
self._peer_list = process_peer_list(data, self._network, self._peer_list)
|
|
|
|
# Other "user" related packet types that we don't do much or anything with yet
|
|
#
|
|
elif (_packettype == PVT_VOICE):
|
|
logger.warning('<<- (%s) Voice Packet From:%s:%s', self._network, host, port)
|
|
|
|
elif (_packettype == GROUP_DATA):
|
|
logger.warning('<<- (%s) Group Data Packet From:%s:%s', self._network, host, port)
|
|
|
|
elif (_packettype == PVT_DATA):
|
|
logger.warning('<<- (%s) Private Data Packet From From:%s:%s', self._network, host, port)
|
|
|
|
elif (_packettype == DE_REG_REQ):
|
|
de_register_peer(self._network, _peerid)
|
|
logger.warning('<<- (%s) Peer De-Registration Request From:%s:%s', self._network, host, port)
|
|
|
|
elif (_packettype == DE_REG_REPLY):
|
|
logger.warning('<<- (%s) Peer De-Registration Reply From:%s:%s', self._network, host, port)
|
|
|
|
elif (_packettype == RPT_WAKE_UP):
|
|
logger.warning('<<- (%s) Repeater Wake-Up Packet From:%s:%s', self._network, host, port)
|
|
|
|
# Technically, we're not paying any attention to these types because we're not part of the XCMP call control structure
|
|
#
|
|
elif (_packettype == XCMP_XNL):
|
|
logger.warning('<<- (%s) XCMP_XNL From:%s:%s, but we did not indicate XCMP capable!', self._network, host, port)
|
|
|
|
elif (_packettype in (CALL_CTL_1, CALL_CTL_2, CALL_CTL_3)):
|
|
logger.warning('<<- (%s) Call Control Packet From:%s:%s', self._network, host, port)
|
|
|
|
# If there's a packet type we don't know aobut, it should be logged so we can figure it out and take an appropriate action!
|
|
else:
|
|
packet_type = binascii.b2a_hex(_packettype)
|
|
logger.error('<<- (%s) Received Unprocessed Type %s From:%s:%s', self._network, packet_type, host, port)
|
|
|
|
|
|
|
|
#************************************************
|
|
# MAIN PROGRAM LOOP STARTS HERE
|
|
#************************************************
|
|
|
|
if __name__ == '__main__':
|
|
networks = {}
|
|
for ipsc_network in NETWORK:
|
|
networks[ipsc_network] = IPSC(ipsc_network)
|
|
if (NETWORK[ipsc_network]['LOCAL']['ENABLED']):
|
|
reactor.listenUDP(NETWORK[ipsc_network]['LOCAL']['PORT'], networks[ipsc_network])
|
|
reactor.run() |