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DMRlink/bridge.py

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#!/usr/bin/env python
#
# 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. it uses
# one required (bridge_rules.py) and one optional (known_bridges.py) additional
# configuration files. Both files have their own documentation for use.
#
# "bridge_rules" contains the IPSC network, Timeslot and TGID matching rules to
# determine which voice calls are bridged between IPSC networks and which are
# not.
#
# "known_bridges" contains DMR radio ID numbers of known bridges. This file is
# used when you want bridge.py to be "polite" or serve as a backup bridge. If
# a known bridge exists in either a source OR target IPSC network, then no
# bridging between those IPSC networks will take place. This behavior is
# dynamic and updates each keep-alive interval (main configuration file).
# For faster failover, configure a short keep-alive time and a low number of
# missed keep-alives before timout. I recommend 5 sec keep-alive and 3 missed.
# That gives a worst-case scenario of 15 seconds to fail over. Recovery will
# typically happen with a single "blip" in the transmission up to about 5
# seconds.
#
# While this file is listed as Beta status, K0USY Group depends on this code
# for the bridigng of it's many repeaters. We consider it reliable, but you
# get what you pay for... as usual, no guarantees.
from __future__ import print_function
from twisted.internet import reactor
from twisted.internet import task
from binascii import b2a_hex as h
from time import time
import sys
from dmrlink import IPSC, NETWORK, networks, REPORTS, reporting_loop, dmr_nat, logger, hex_str_3, hex_str_4, int_id
__author__ = 'Cortney T. Buffington, N0MJS'
__copyright__ = 'Copyright (c) 2013-2015 Cortney T. Buffington, N0MJS and the K0USY Group'
__credits__ = 'Adam Fast, KC0YLK, Dave K, and he who wishes not to be named'
__license__ = 'Creative Commons Attribution-ShareAlike 3.0 Unported'
__version__ = '0.29b'
__maintainer__ = 'Cort Buffington, N0MJS'
__email__ = 'n0mjs@me.com'
__status__ = 'beta'
# Constants for this application
#
BURST_DATA_TYPE = {
'VOICE_HEAD': '\x01',
'VOICE_TERM': '\x02',
'SLOT1_VOICE': '\x0A',
'SLOT2_VOICE': '\x8A'
}
TS_CLEAR_TIME = .2
# Import Bridging rules
# Note: A stanza *must* exist for any IPSC configured in the main
# configuration file and listed as "active". It can be empty,
# but it has to exist.
#
try:
from bridge_rules import RULES as RULES_FILE
logger.info('Bridge rules file found and rules imported')
except ImportError:
sys.exit('Bridging rules file not found or invalid')
# Convert integer GROUP ID numbers from the config into hex strings
# we need to send in the actual data packets.
#
for _ipsc in RULES_FILE:
for _rule in RULES_FILE[_ipsc]['GROUP_VOICE']:
_rule['SRC_GROUP'] = hex_str_3(_rule['SRC_GROUP'])
_rule['DST_GROUP'] = hex_str_3(_rule['DST_GROUP'])
_rule['SRC_TS'] = _rule['SRC_TS'] - 1
_rule['DST_TS'] = _rule['DST_TS'] - 1
if _ipsc not in NETWORK:
sys.exit('ERROR: Bridge rules found for an IPSC network not configured in main configuration')
for _ipsc in NETWORK:
if _ipsc not in RULES_FILE:
sys.exit('ERROR: Bridge rules not found for all IPSC network configured')
RULES = RULES_FILE
# Import List of Bridges
# This is how we identify known bridges. If one of these is present
# and it's mode byte is set to bridge, we don't
#
try:
from known_bridges import BRIDGES
logger.info('Known bridges file found and bridge ID list imported ')
except ImportError:
logger.critical('\'known_bridges.py\' not found - backup bridge service will not be enabled')
BRIDGES = []
class bridgeIPSC(IPSC):
def __init__(self, *args, **kwargs):
IPSC.__init__(self, *args, **kwargs)
if BRIDGES:
logger.info('Initializing backup/polite bridging')
self.BRIDGE = False
else:
self.BRIDGE = True
logger.info('Initializing standard bridging')
self.IPSC_STATUS = {
'TS1': {'RX_GROUP':'\x00', 'TX_GROUP':'\x00', 'RX_TIME':0, 'TX_TIME':0, 'RX_SRC_SUB':'\x00', 'TX_SRC_SUB':'\x00'},
'TS2': {'RX_GROUP':'\x00', 'TX_GROUP':'\x00', 'RX_TIME':0, 'TX_TIME':0, 'RX_SRC_SUB':'\x00', 'TX_SRC_SUB':'\x00'}
}
# Setup the backup/polite bridging maintenance loop (based on keep-alive timer)
if BRIDGES:
def startProtocol(self):
IPSC.startProtocol(self)
self._bridge_presence = task.LoopingCall(self.bridge_presence_loop)
self._bridge_presence_loop = self._bridge_presence.start(self._local['ALIVE_TIMER'])
# This is the backup/polite bridge maintenance loop
def bridge_presence_loop(self):
_temp_bridge = True
for peer in BRIDGES:
_peer = hex_str_4(peer)
if _peer in self._peers.keys() and (self._peers[_peer]['MODE_DECODE']['TS_1'] or self._peers[_peer]['MODE_DECODE']['TS_2']):
_temp_bridge = False
logger.debug('(%s) Peer %s is an active bridge', self._network, int_id(_peer))
if _peer == self._master['RADIO_ID'] \
and self._master['STATUS']['CONNECTED'] \
and (self._master['MODE_DECODE']['TS_1'] or self._master['MODE_DECODE']['TS_2']):
_temp_bridge = False
logger.debug('(%s) Master %s is an active bridge',self._network, int_id(_peer))
if self.BRIDGE != _temp_bridge:
logger.info('(%s) Changing bridge status to: %s', self._network, _temp_bridge )
self.BRIDGE = _temp_bridge
#************************************************
# CALLBACK FUNCTIONS FOR USER PACKET TYPES
#************************************************
#
def group_voice(self, _network, _src_sub, _dst_group, _ts, _end, _peerid, _data):
logger.debug('(%s) Group Voice Packet Received From: %s, IPSC Peer %s, Destination %s', _network, int_id(_src_sub), int_id(_peerid), int_id(_dst_group))
_burst_data_type = _data[30] # Determine the type of voice packet this is (see top of file for possible types)
if _ts == 0:
_TS = 'TS1'
elif _ts == 1:
_TS = 'TS2'
now = time() # Mark packet arrival time -- we'll need this for call contention handling
for rule in RULES[_network]['GROUP_VOICE']:
_target = rule['DST_NET'] # Shorthand to reduce length and make it easier to read
_status = networks[_target].IPSC_STATUS # Shorthand to reduce length and make it easier to read
# Matching for rules is against the Destination Group in the SOURCE packet (SRC_GROUP)
#if rule['SRC_GROUP'] == _dst_group and rule['SRC_TS'] == _ts:
#if BRIDGES:
if (rule['SRC_GROUP'] == _dst_group and rule['SRC_TS'] == _ts) and (self.BRIDGE == True or networks[_target].BRIDGE == True):
if RULES[_network]['TRUNK'] == False:
if ((rule['DST_GROUP'] != _status[_TS]['RX_GROUP']) and ((now - _status[_TS]['RX_TIME']) < RULES[_network]['GROUP_HANGTIME'])):
if _burst_data_type == BURST_DATA_TYPE['VOICE_HEAD']:
logger.info('(%s) Call not bridged, target active or in group hangtime: IPSC %s, %s, TGID%s', _network, _target, _TS, int_id(rule['DST_GROUP']))
continue
if ((rule['DST_GROUP'] != _status[_TS]['TX_GROUP']) and ((now - _status[_TS]['TX_TIME']) < RULES[_network]['GROUP_HANGTIME'])):
if _burst_data_type == BURST_DATA_TYPE['VOICE_HEAD']:
logger.info('(%s) Call not bridged to destination on TGID %s, target in group hangtime: IPSC %s, %s, TGID%s', _network, int_id(_status[_TS]['TX_GROUP']), _target, _TS, int_id(rule['DST_GROUP']))
continue
if (rule['DST_GROUP'] == _status[_TS]['TX_GROUP']) and (_src_sub != _status[_TS]['TX_SRC_SUB']) and ((now - _status[_TS]['TX_TIME']) < TS_CLEAR_TIME):
if _burst_data_type == BURST_DATA_TYPE['VOICE_HEAD']:
logger.info('(%s) Call not bridged, call bridge in progress from %s, target: IPSC %s, %s, TGID%s', _network, int_id(_src_sub), _target, _TS, int_id(rule['DST_GROUP']))
continue
if (rule['DST_GROUP'] == _status[_TS]['RX_GROUP']) and ((now - _status[_TS]['RX_TIME']) < TS_CLEAR_TIME):
if _burst_data_type == BURST_DATA_TYPE['VOICE_HEAD']:
logger.info('(%s) Call not bridged, matching call already active on target: IPSC %s, %s, TGID%s', _network, _target, _TS, int_id(rule['DST_GROUP']))
continue
_tmp_data = _data
# 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_group, rule['DST_GROUP'])
# Re-Write IPSC timeslot value
_call_info = int_id(_data[17:18])
if rule['DST_TS'] == 0:
_call_info &= ~(1 << 5)
elif rule['DST_TS'] == 1:
_call_info |= 1 << 5
_call_info = chr(_call_info)
_tmp_data = _tmp_data[:17] + _call_info + _tmp_data[18:]
# Re-Write DMR timeslot value
# Determine if the slot is present, so we can translate if need be
if _burst_data_type == BURST_DATA_TYPE['SLOT1_VOICE'] or _burst_data_type == BURST_DATA_TYPE['SLOT2_VOICE']:
_slot_valid = True
else:
_slot_valid = False
# Re-Write timeslot if necessary...
if _slot_valid:
if rule['DST_TS'] == 0:
_burst_data_type = BURST_DATA_TYPE['SLOT1_VOICE']
elif rule['DST_TS'] == 1:
_burst_data_type = BURST_DATA_TYPE['SLOT2_VOICE']
_tmp_data = _tmp_data[:30] + _burst_data_type + _tmp_data[31:]
# Calculate and append the authentication hash for the target network... if necessary
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
networks[_target].send_to_ipsc(_tmp_data)
_status[_TS]['TX_GROUP'] = rule['DST_GROUP']
_status[_TS]['TX_TIME'] = now
_status[_TS]['TX_SRC_SUB'] = _src_sub
# Mark the group and time that a packet was recieved
self.IPSC_STATUS[_TS]['RX_GROUP'] = _dst_group
self.IPSC_STATUS[_TS]['RX_TIME'] = now
def group_data(self, _network, _src_sub, _dst_sub, _ts, _end, _peerid, _data):
logger.debug('(%s) Group Data Packet Received From: %s, IPSC Peer %s, Destination %s', _network, int_id(_src_sub), int_id(_peerid), int_id(_dst_sub))
for target in RULES[_network]['GROUP_DATA']:
if self.BRIDGE == True or networks[target].BRIDGE == True:
_tmp_data = _data
# Re-Write the IPSC SRC to match the target network's ID
_tmp_data = _tmp_data.replace(_peerid, NETWORK[target]['LOCAL']['RADIO_ID'])
# Calculate and append the authentication hash for the target network... if necessary
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
networks[target].send_to_ipsc(_tmp_data)
def private_data(self, _network, _src_sub, _dst_sub, _ts, _end, _peerid, _data):
logger.debug('(%s) Private Data Packet Received From: %s, IPSC Peer %s, Destination %s', _network, int_id(_src_sub), int_id(_peerid), int_id(_dst_sub))
for target in RULES[_network]['PRIVATE_DATA']:
if self.BRIDGE == True or networks[target].BRIDGE == True:
_tmp_data = _data
# Re-Write the IPSC SRC to match the target network's ID
_tmp_data = _tmp_data.replace(_peerid, NETWORK[target]['LOCAL']['RADIO_ID'])
# Calculate and append the authentication hash for the target network... if necessary
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
networks[target].send_to_ipsc(_tmp_data)
if __name__ == '__main__':
logger.info('DMRlink \'bridge.py\' (c) 2013-2015 N0MJS & the K0USY Group - SYSTEM STARTING...')
# INITIALIZE AN IPSC OBJECT (SELF SUSTAINING) FOR EACH CONFIGUED IPSC
for ipsc_network in NETWORK:
if NETWORK[ipsc_network]['LOCAL']['ENABLED']:
networks[ipsc_network] = bridgeIPSC(ipsc_network)
reactor.listenUDP(NETWORK[ipsc_network]['LOCAL']['PORT'], networks[ipsc_network], interface=NETWORK[ipsc_network]['LOCAL']['IP'])
# INITIALIZE THE REPORTING LOOP IF CONFIGURED
if REPORTS['REPORT_NETWORKS']:
reporting = task.LoopingCall(reporting_loop)
reporting.start(REPORTS['REPORT_INTERVAL'])
reactor.run()
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