DMRlink/bridge.py
2013-12-06 06:52:43 -06:00

118 lines
4.3 KiB
Python
Executable File

# Copyright (c) 2013 Cortney T. Buffington, N0MJS and the K0USY Group. n0mjs@me.com
#
# This work is licensed under the Creative Commons Attribution-ShareAlike
# 3.0 Unported License.To view a copy of this license, visit
# http://creativecommons.org/licenses/by-sa/3.0/ or send a letter to
# Creative Commons, 444 Castro Street, Suite 900, Mountain View,
# California, 94041, USA.
# This is a sample application to bridge traffic between IPSC networks
from __future__ import print_function
from twisted.internet import reactor
from binascii import b2a_hex as h
import sys
from dmrlink import IPSC, NETWORK, networks, send_to_ipsc, dmr_nat, logger
NAT = 0
#NAT = '\x2f\x9b\x80'
# Notes and pieces of next steps...
# RPT_WAKE_UP = b'\x85' + NETWORK[_network]['LOCAL']['RADIO_ID] + b'\x00\x00\x00\x01' + b'\x01' + b'\x01'
# TS1 = 0, TS2 = 1
# Import Bridging rules
#
try:
from bridge_rules import RULES
except ImportError:
sys.exit('Bridging rules file not found or invalid')
class bridgeIPSC(IPSC):
def __init__(self, *args, **kwargs):
IPSC.__init__(self, *args, **kwargs)
self.ACTIVE_CALLS = []
#************************************************
# CALLBACK FUNCTIONS FOR USER PACKET TYPES
#************************************************
def group_voice(self, _network, _src_sub, _dst_sub, _ts, _end, _peerid, _data):
if _ts not in self.ACTIVE_CALLS:
self.ACTIVE_CALLS.append(_ts)
# send repeater wake up, but send them when a repeater is likely not TXing check time since end (see below)
if _end:
self.ACTIVE_CALLS.remove(_ts)
# flag the time here so we can test to see if the last call ended long enough ago to send a wake-up
# timer = time()
for source in RULES[_network]['GROUP_VOICE']:
# Matching for rules is against the Destination Group in the SOURCE packet (SRC_GROUP)
if source['SRC_GROUP'] == _dst_sub:
_tmp_data = _data
_target = source['DST_NET']
# Re-Write the IPSC SRC to match the target network's ID
_tmp_data = _tmp_data.replace(_peerid, NETWORK[_target]['LOCAL']['RADIO_ID'])
# Re-Write the destination Group ID
_tmp_data = _tmp_data.replace(_dst_sub, source['DST_GROUP'])
# Calculate and append the authentication hash for the target network... if necessary
if NAT:
_tmp_data = dmr_nat(_tmp_data, _src_sub, NAT)
if NETWORK[_target]['LOCAL']['AUTH_ENABLED']:
_tmp_data = self.hashed_packet(NETWORK[_target]['LOCAL']['AUTH_KEY'], _tmp_data)
# Send the packet to all peers in the target IPSC
send_to_ipsc(_target, _tmp_data)
def private_voice(self, _network, _src_sub, _dst_sub, _ts, _end, _peerid, _data):
pass
def group_data(self, _network, _src_sub, _dst_sub, _ts, _end, _peerid, _data):
pass
def private_data(self, _network, _src_sub, _dst_sub, _ts, _end, _peerid, _data):
pass
def call_mon_origin(self, _network, _data):
pass
def call_mon_rpt(self, _network, _data):
pass
def call_mon_nack(self, _network, _data):
pass
def xcmp_xnl(self, _network, _data):
pass
class bridgeUnauthIPSC(bridgeIPSC):
# There isn't a hash to build, so just return the data
#
def hashed_packet(self, _key, _data):
return _data
# Remove the hash from a packet and return the payload... except don't
#
def strip_hash(self, _data):
return _data
# Everything is validated, so just return True
#
def validate_auth(self, _key, _data):
return True
if __name__ == '__main__':
logger.info('DMRlink \'bridge.py\' (c) 2013 N0MJS & the K0USY Group - SYSTEM STARTING...')
for ipsc_network in NETWORK:
if NETWORK[ipsc_network]['LOCAL']['ENABLED']:
if NETWORK[ipsc_network]['LOCAL']['AUTH_ENABLED']:
networks[ipsc_network] = bridgeIPSC(ipsc_network)
else:
networks[ipsc_network] = bridgeUnauthIPSC(ipsc_network)
reactor.listenUDP(NETWORK[ipsc_network]['LOCAL']['PORT'], networks[ipsc_network])
reactor.run()