121 lines
4.4 KiB
Python
Executable File
121 lines
4.4 KiB
Python
Executable File
# Copyright (c) 2013 Cortney T. Buffington, N0MJS and the K0USY Group. 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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# This is a sample application to bridge traffic between IPSC networks
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from __future__ import print_function
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from twisted.internet import reactor
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from binascii import b2a_hex as h
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import sys
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from dmrlink import IPSC, NETWORK, networks, send_to_ipsc, dmr_nat, logger
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NAT = 0
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#NAT = '\x2f\x9b\x80'
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# Notes and pieces of next steps...
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# RPT_WAKE_UP = b'\x85' + NETWORK[_network]['LOCAL']['RADIO_ID] + b'\x00\x00\x00\x01' + b'\x01' + b'\x01'
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# TS1 = 0, TS2 = 1
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# Import Bridging rules
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#
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try:
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from bridge_rules import RULES
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except ImportError:
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sys.exit('Bridging rules file not found or invalid')
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class bridgeIPSC(IPSC):
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def __init__(self, *args, **kwargs):
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IPSC.__init__(self, *args, **kwargs)
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self.ACTIVE_CALLS = []
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#************************************************
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# CALLBACK FUNCTIONS FOR USER PACKET TYPES
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#************************************************
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def group_voice(self, _network, _src_sub, _dst_group, _ts, _end, _peerid, _data):
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if _ts not in self.ACTIVE_CALLS:
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self.ACTIVE_CALLS.append(_ts)
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# send repeater wake up, but send them when a repeater is likely not TXing check time since end (see below)
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if _end:
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self.ACTIVE_CALLS.remove(_ts)
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# flag the time here so we can test to see if the last call ended long enough ago to send a wake-up
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# timer = time()
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for rule in RULES[_network]['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 rule['SRC_GROUP'] == _dst_group and rule['SRC_TS'] == _ts:
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_tmp_data = _data
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_target = rule['DST_NET']
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# Re-Write the IPSC SRC to match the target network's ID
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_tmp_data = _tmp_data.replace(_peerid, NETWORK[_target]['LOCAL']['RADIO_ID'])
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# Re-Write the destination Group ID
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_tmp_data = _tmp_data.replace(_dst_group, rule['DST_GROUP'])
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# NAT doesn't work well... use at your own risk!
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if NAT:
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_tmp_data = dmr_nat(_tmp_data, _src_sub, NAT)
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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_ENABLED']:
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_tmp_data = self.hashed_packet(NETWORK[_target]['LOCAL']['AUTH_KEY'], _tmp_data)
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# Send the packet to all peers in the target IPSC
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send_to_ipsc(_target, _tmp_data)
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def private_voice(self, _network, _src_sub, _dst_sub, _ts, _end, _peerid, _data):
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pass
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def group_data(self, _network, _src_sub, _dst_sub, _ts, _end, _peerid, _data):
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pass
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def private_data(self, _network, _src_sub, _dst_sub, _ts, _end, _peerid, _data):
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pass
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def call_mon_origin(self, _network, _data):
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pass
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def call_mon_rpt(self, _network, _data):
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pass
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def call_mon_nack(self, _network, _data):
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pass
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def xcmp_xnl(self, _network, _data):
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pass
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class bridgeUnauthIPSC(bridgeIPSC):
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# There isn't a hash to build, so just return the data
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#
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def hashed_packet(self, _key, _data):
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return _data
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# Remove the hash from a packet and return the payload... except don't
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#
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def strip_hash(self, _data):
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return _data
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# Everything is validated, so just return True
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#
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def validate_auth(self, _key, _data):
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return True
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if __name__ == '__main__':
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logger.info('DMRlink \'bridge.py\' (c) 2013 N0MJS & the K0USY Group - SYSTEM STARTING...')
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for ipsc_network in NETWORK:
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if NETWORK[ipsc_network]['LOCAL']['ENABLED']:
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if NETWORK[ipsc_network]['LOCAL']['AUTH_ENABLED']:
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networks[ipsc_network] = bridgeIPSC(ipsc_network)
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else:
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networks[ipsc_network] = bridgeUnauthIPSC(ipsc_network)
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reactor.listenUDP(NETWORK[ipsc_network]['LOCAL']['PORT'], networks[ipsc_network])
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reactor.run()
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