305 lines
17 KiB
Python
Executable File
305 lines
17 KiB
Python
Executable File
#!/usr/bin/env python
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#
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###############################################################################
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# Copyright (C) 2016-2019 Cortney T. Buffington, N0MJS <n0mjs@me.com>
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software Foundation,
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# Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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###############################################################################
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'''
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This is a very simple call/packet router for Homebrew Repeater Protocol. It
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will forward traffic from any system to all other systems configured in the
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hblink.py configuration file. It does not check for call contentions or
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filter TS/TGID combinations. It should really only be used as a proxy to
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hide multiple Homebrew repater protocol systems behind what appears as a single
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repeater, hotspot, etc.
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As is, this program only works with group voice packets. It could work for all
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of them by removing a few things.
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IT ONLY WORKS FOR HBP SYSTEMS!!! Using it with OpenBridge or XLX wouldn't make
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a lot of sense, and has the potential to do bad things.
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'''
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# Python modules we need
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import sys
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from bitarray import bitarray
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from time import time
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from importlib import import_module
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from types import ModuleType
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# Twisted is pretty important, so I keep it separate
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from twisted.internet.protocol import Factory, Protocol
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from twisted.protocols.basic import NetstringReceiver
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from twisted.internet import reactor, task
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# Things we import from the main hblink module
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from hblink import HBSYSTEM, OPENBRIDGE, systems, hblink_handler, reportFactory, REPORT_OPCODES, config_reports, mk_aliases, acl_check
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from dmr_utils3.utils import bytes_3, int_id, get_alias
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from dmr_utils3 import decode, bptc, const
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import config
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import log
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import const
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# The module needs logging logging, but handlers, etc. are controlled by the parent
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import logging
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logger = logging.getLogger(__name__)
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# Does anybody read this stuff? There's a PEP somewhere that says I should do this.
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__author__ = 'Cortney T. Buffington, N0MJS'
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__copyright__ = 'Copyright (c) 2016-2018 Cortney T. Buffington, N0MJS and the K0USY Group'
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__credits__ = 'Colin Durbridge, G4EML, Steve Zingman, N4IRS; Mike Zingman, N4IRR; Jonathan Naylor, G4KLX; Hans Barthen, DL5DI; Torsten Shultze, DG1HT'
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__license__ = 'GNU GPLv3'
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__maintainer__ = 'Cort Buffington, N0MJS'
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__email__ = 'n0mjs@me.com'
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__status__ = 'pre-alpha'
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# Module gobal varaibles
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class bridgeallSYSTEM(HBSYSTEM):
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def __init__(self, _name, _config, _report):
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HBSYSTEM.__init__(self, _name, _config, _report)
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self._laststrid = ''
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# Status information for the system, TS1 & TS2
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# 1 & 2 are "timeslot"
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# In TX_EMB_LC, 2-5 are burst B-E
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self.STATUS = {
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1: {
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'RX_START': time(),
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'RX_SEQ': '\x00',
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'RX_RFS': '\x00',
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'TX_RFS': '\x00',
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'RX_STREAM_ID': '\x00',
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'TX_STREAM_ID': '\x00',
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'RX_TGID': '\x00\x00\x00',
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'TX_TGID': '\x00\x00\x00',
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'RX_TIME': time(),
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'TX_TIME': time(),
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'RX_TYPE': const.HBPF_SLT_VTERM,
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'RX_LC': '\x00',
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'TX_H_LC': '\x00',
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'TX_T_LC': '\x00',
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'TX_EMB_LC': {
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1: '\x00',
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2: '\x00',
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3: '\x00',
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4: '\x00',
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}
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},
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2: {
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'RX_START': time(),
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'RX_SEQ': '\x00',
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'RX_RFS': '\x00',
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'TX_RFS': '\x00',
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'RX_STREAM_ID': '\x00',
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'TX_STREAM_ID': '\x00',
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'RX_TGID': '\x00\x00\x00',
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'TX_TGID': '\x00\x00\x00',
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'RX_TIME': time(),
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'TX_TIME': time(),
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'RX_TYPE': const.HBPF_SLT_VTERM,
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'RX_LC': '\x00',
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'TX_H_LC': '\x00',
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'TX_T_LC': '\x00',
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'TX_EMB_LC': {
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1: '\x00',
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2: '\x00',
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3: '\x00',
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4: '\x00',
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}
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}
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}
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def dmrd_received(self, _peer_id, _rf_src, _dst_id, _seq, _slot, _call_type, _frame_type, _dtype_vseq, _stream_id, _data):
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pkt_time = time()
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dmrpkt = _data[20:53]
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_bits = _data[15]
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if _call_type == 'group':
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# Is this is a new call stream?
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new_stream = (_stream_id != self.STATUS[_slot]['RX_STREAM_ID'])
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if new_stream:
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self.STATUS[_slot]['RX_START'] = pkt_time
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logger.info('(%s) *CALL START* STREAM ID: %s SUB: %s (%s) PEER: %s (%s) TGID %s (%s), TS %s', \
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self._system, int_id(_stream_id), get_alias(_rf_src, subscriber_ids), int_id(_rf_src), get_alias(_peer_id, peer_ids), int_id(_peer_id), get_alias(_dst_id, talkgroup_ids), int_id(_dst_id), _slot)
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# Final actions - Is this a voice terminator?
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if (_frame_type == const.HBPF_DATA_SYNC) and (_dtype_vseq == const.HBPF_SLT_VTERM) and (self.STATUS[_slot]['RX_TYPE'] != const.HBPF_SLT_VTERM):
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call_duration = pkt_time - self.STATUS[_slot]['RX_START']
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logger.info('(%s) *CALL END* STREAM ID: %s SUB: %s (%s) PEER: %s (%s) TGID %s (%s), TS %s, Duration: %s', \
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self._system, int_id(_stream_id), get_alias(_rf_src, subscriber_ids), int_id(_rf_src), get_alias(_peer_id, peer_ids), int_id(_peer_id), get_alias(_dst_id, talkgroup_ids), int_id(_dst_id), _slot, call_duration)
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for _target in self._CONFIG['SYSTEMS']:
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if _target != self._system:
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_target_status = systems[_target].STATUS
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_target_system = self._CONFIG['SYSTEMS'][_target]
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# BEGIN STANDARD CONTENTION HANDLING
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#
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# The rules for each of the 4 "ifs" below are listed here for readability. The Frame To Send is:
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# From a different group than last RX from this HBSystem, but it has been less than Group Hangtime
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# From a different group than last TX to this HBSystem, but it has been less than Group Hangtime
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# From the same group as the last RX from this HBSystem, but from a different subscriber, and it has been less than stream timeout
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# From the same group as the last TX to this HBSystem, but from a different subscriber, and it has been less than stream timeout
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# The "continue" at the end of each means the next iteration of the for loop that tests for matching rules
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#
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if ((_dst_id != _target_status[_slot]['RX_TGID']) and ((pkt_time - _target_status[_slot]['RX_TIME']) < _target_system['GROUP_HANGTIME'])):
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if _frame_type == HBPF_DATA_SYNC and _dtype_vseq == HBPF_SLT_VHEAD and self.STATUS[_slot]['RX_STREAM_ID'] != _stream_id:
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logger.info('(%s) Call not routed to TGID %s, target active or in group hangtime: HBSystem: %s, TS: %s, TGID: %s', self._system, int_id(_target['TGID']), _target['SYSTEM'], _target['TS'], int_id(_target_status[_target['TS']]['RX_TGID']))
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continue
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if ((_dst_id != _target_status[_slot]['TX_TGID']) and ((pkt_time - _target_status[_slot]['TX_TIME']) < _target_system['GROUP_HANGTIME'])):
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if _frame_type == HBPF_DATA_SYNC and _dtype_vseq == HBPF_SLT_VHEAD and self.STATUS[_slot]['RX_STREAM_ID'] != _stream_id:
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logger.info('(%s) Call not routed to TGID%s, target in group hangtime: HBSystem: %s, TS: %s, TGID: %s', self._system, int_id(_target['TGID']), _target['SYSTEM'], _target['TS'], int_id(_target_status[_target['TS']]['TX_TGID']))
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continue
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if (_dst_id == _target_status[_slot]['RX_TGID']) and ((pkt_time - _target_status[_slot]['RX_TIME']) < STREAM_TO):
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if _frame_type == HBPF_DATA_SYNC and _dtype_vseq == HBPF_SLT_VHEAD and self.STATUS[_slot]['RX_STREAM_ID'] != _stream_id:
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logger.info('(%s) Call not routed to TGID%s, matching call already active on target: HBSystem: %s, TS: %s, TGID: %s', self._system, int_id(_target['TGID']), _target['SYSTEM'], _target['TS'], int_id(_target_status[_target['TS']]['RX_TGID']))
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continue
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if (_dst_id == _target_status[_slot]['TX_TGID']) and (_rf_src != _target_status[_slot]['TX_RFS']) and ((pkt_time - _target_status[_slot]['TX_TIME']) < STREAM_TO):
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if _frame_type == HBPF_DATA_SYNC and _dtype_vseq == HBPF_SLT_VHEAD and self.STATUS[_slot]['RX_STREAM_ID'] != _stream_id:
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logger.info('(%s) Call not routed for subscriber %s, call route in progress on target: HBSystem: %s, TS: %s, TGID: %s, SUB: %s', self._system, int_id(_rf_src), _target['SYSTEM'], _target['TS'], int_id(_target_status[_target['TS']]['TX_TGID']), int_id(_target_status[_target['TS']]['TX_RFS']))
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continue
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# ACL Processing
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if self._CONFIG['GLOBAL']['USE_ACL']:
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if not acl_check(_rf_src, self._CONFIG['GLOBAL']['SUB_ACL']):
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if _stream_id != _target_status[_slot]['TX_STREAM_ID']:
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logger.info('(%s) CALL DROPPED ON EGRESS WITH STREAM ID %s FROM SUBSCRIBER %s BY GLOBAL ACL', _target, int_id(_stream_id), int_id(_rf_src))
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_target_status[_slot]['TX_STREAM_ID'] = _stream_id
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continue
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if _slot == 1 and not acl_check(_dst_id, self._CONFIG['GLOBAL']['TG1_ACL']):
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if _stream_id != _target_status[_slot]['TX_STREAM_ID']:
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logger.info('(%s) CALL DROPPED ON EGRESS WITH STREAM ID %s ON TGID %s BY GLOBAL TS1 ACL', _target, int_id(_stream_id), int_id(_dst_id))
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_target_status[_slot]['TX_STREAM_ID'] = _stream_id
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continue
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if _slot == 2 and not acl_check(_dst_id, self._CONFIG['GLOBAL']['TG2_ACL']):
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if _stream_id != _target_status[_slot]['TX_STREAM_ID']:
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logger.info('(%s) CALL DROPPED ON EGRESS WITH STREAM ID %s ON TGID %s BY GLOBAL TS2 ACL', _target, int_id(_stream_id), int_id(_dst_id))
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_target_status[_slot]['TX_STREAM_ID'] = _stream_id
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continue
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if _target_system['USE_ACL']:
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if not acl_check(_rf_src, _target_system['SUB_ACL']):
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if _stream_id != _target_status[_slot]['TX_STREAM_ID']:
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logger.info('(%s) CALL DROPPED ON EGRESS WITH STREAM ID %s FROM SUBSCRIBER %s BY SYSTEM ACL', _target, int_id(_stream_id), int_id(_rf_src))
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_target_status[_slot]['TX_STREAM_ID'] = _stream_id
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continue
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if _slot == 1 and not acl_check(_dst_id, _target_system['TG1_ACL']):
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if _stream_id != _target_status[_slot]['TX_STREAM_ID']:
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logger.info('(%s) CALL DROPPED ON EGRESS WITH STREAM ID %s ON TGID %s BY SYSTEM TS1 ACL', _target, int_id(_stream_id), int_id(_dst_id))
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_target_status[_slot]['TX_STREAM_ID'] = _stream_id
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continue
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if _slot == 2 and not acl_check(_dst_id, _target_system['TG2_ACL']):
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if _stream_id != _target_status[_slot]['TX_STREAM_ID']:
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logger.info('(%s) CALL DROPPED ON EGRESS WITH STREAM ID %s ON TGID %s BY SYSTEM TS2 ACL', _target, int_id(_stream_id), int_id(_dst_id))
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_target_status[_slot]['TX_STREAM_ID'] = _stream_id
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continue
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# Record this stuff for later
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# Is this a new call stream?
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if new_stream:
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# Record the DST TGID and Stream ID
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_target_status[_slot]['TX_START'] = pkt_time
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_target_status[_slot]['TX_TGID'] = _dst_id
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_target_status[_slot]['TX_RFS'] = _rf_src
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_target_status[_slot]['TX_PEER'] = _peer_id
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_target_status[_slot]['TX_STREAM_ID'] = _stream_id
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_target_status[_slot]['TX_TIME'] = pkt_time
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systems[_target].send_system(_data)
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#logger.debug('(%s) Packet routed to system: %s', self._system, _target)
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# Mark status variables for use later
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self.STATUS[_slot]['RX_RFS'] = _rf_src
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self.STATUS[_slot]['RX_TYPE'] = _dtype_vseq
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self.STATUS[_slot]['RX_TGID'] = _dst_id
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self.STATUS[_slot]['RX_TIME'] = pkt_time
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self.STATUS[_slot]['RX_STREAM_ID'] = _stream_id
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#************************************************
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# MAIN PROGRAM LOOP STARTS HERE
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#************************************************
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if __name__ == '__main__':
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import argparse
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import sys
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import os
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import signal
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from dmr_utils3.utils import try_download, mk_id_dict
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# Change the current directory to the location of the application
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os.chdir(os.path.dirname(os.path.realpath(sys.argv[0])))
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# CLI argument parser - handles picking up the config file from the command line, and sending a "help" message
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parser = argparse.ArgumentParser()
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parser.add_argument('-c', '--config', action='store', dest='CONFIG_FILE', help='/full/path/to/config.file (usually hblink.cfg)')
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parser.add_argument('-l', '--logging', action='store', dest='LOG_LEVEL', help='Override config file logging level.')
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cli_args = parser.parse_args()
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# Ensure we have a path for the config file, if one wasn't specified, then use the default (top of file)
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if not cli_args.CONFIG_FILE:
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cli_args.CONFIG_FILE = os.path.dirname(os.path.abspath(__file__))+'/hblink.cfg'
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# Call the external routine to build the configuration dictionary
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CONFIG = config.build_config(cli_args.CONFIG_FILE)
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# Start the system logger
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if cli_args.LOG_LEVEL:
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CONFIG['LOGGER']['LOG_LEVEL'] = cli_args.LOG_LEVEL
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logger = log.config_logging(CONFIG['LOGGER'])
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logger.info('\n\nCopyright (c) 2013, 2014, 2015, 2016, 2018, 2019\n\tThe Regents of the K0USY Group. All rights reserved.\n')
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logger.debug('Logging system started, anything from here on gets logged')
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# Set up the signal handler
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def sig_handler(_signal, _frame):
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logger.info('SHUTDOWN: BRIDGE_ALL IS TERMINATING WITH SIGNAL %s', str(_signal))
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hblink_handler(_signal, _frame)
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logger.info('SHUTDOWN: ALL SYSTEM HANDLERS EXECUTED - STOPPING REACTOR')
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reactor.stop()
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# Set signal handers so that we can gracefully exit if need be
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for sig in [signal.SIGTERM, signal.SIGINT]:
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signal.signal(sig, sig_handler)
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# Create the name-number mapping dictionaries
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peer_ids, subscriber_ids, talkgroup_ids = mk_aliases(CONFIG)
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# INITIALIZE THE REPORTING LOOP
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report_server = config_reports(CONFIG, reportFactory)
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# HBlink instance creation
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logger.info('HBlink \'bridge_all.py\' -- SYSTEM STARTING...')
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for system in CONFIG['SYSTEMS']:
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if CONFIG['SYSTEMS'][system]['ENABLED']:
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if CONFIG['SYSTEMS'][system]['MODE'] == 'OPENBRIDGE':
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logger.critical('%s FATAL: Instance is mode \'OPENBRIDGE\', \n\t\t...Which would be tragic for Bridge All, since it carries multiple call\n\t\tstreams simultaneously. bridge_all.py onlyl works with MMDVM-based systems', system)
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sys.exit('bridge_all.py cannot function with systems that are not MMDVM devices. System {} is configured as an OPENBRIDGE'.format(system))
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else:
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systems[system] = bridgeallSYSTEM(system, CONFIG, report_server)
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reactor.listenUDP(CONFIG['SYSTEMS'][system]['PORT'], systems[system], interface=CONFIG['SYSTEMS'][system]['IP'])
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logger.debug('%s instance created: %s, %s', CONFIG['SYSTEMS'][system]['MODE'], system, systems[system])
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reactor.run()
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