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#!/usr/bin/env python2
# -*- coding: utf-8 -*-
# Virtual Um-interface (fake transceiver)
# OsmocomBB <-> OsmoBTS bridge
#
# (C) 2017 by Vadim Yanitskiy <axilirator@gmail.com>
#
# All Rights Reserved
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License along
# with this program; if not, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
import signal
import getopt
import select
import sys
from ctrl_if_bts import CTRLInterfaceBTS
from ctrl_if_bb import CTRLInterfaceBB
from burst_fwd import BurstForwarder
from fake_pm import FakePM
from udp_link import UDPLink
from clck_gen import CLCKGen
COPYRIGHT = \
"Copyright (C) 2017 by Vadim Yanitskiy <axilirator@gmail.com>\n" \
"License GPLv2+: GNU GPL version 2 or later " \
"<http://gnu.org/licenses/gpl.html>\n" \
"This is free software: you are free to change and redistribute it.\n" \
"There is NO WARRANTY, to the extent permitted by law.\n"
class Application:
# Application variables
bts_addr = "127.0.0.1"
bb_addr = "127.0.0.1"
bts_base_port = 5700
bb_base_port = 6700
# BurstForwarder field randomization
randomize_dl_toa256 = False
randomize_ul_toa256 = False
randomize_dl_rssi = False
randomize_ul_rssi = False
def __init__(self):
self.print_copyright()
self.parse_argv()
# Set up signal handlers
signal.signal(signal.SIGINT, self.sig_handler)
def run(self):
# Init TRX CTRL interface for BTS
self.bts_ctrl = CTRLInterfaceBTS(self.bts_addr,
self.bts_base_port + 101, self.bts_base_port + 1)
# Init TRX CTRL interface for BB
self.bb_ctrl = CTRLInterfaceBB(self.bb_addr,
self.bb_base_port + 101, self.bb_base_port + 1)
# Power measurement emulation
# Noise: -120 .. -105
# BTS: -75 .. -50
self.pm = FakePM(-120, -105, -75, -50)
# Share a FakePM instance between both BTS and BB
self.bts_ctrl.pm = self.pm
self.bb_ctrl.pm = self.pm
# Init DATA links
self.bts_data = UDPLink(self.bts_addr,
self.bts_base_port + 102, self.bts_base_port + 2)
self.bb_data = UDPLink(self.bb_addr,
self.bb_base_port + 102, self.bb_base_port + 2)
# BTS <-> BB burst forwarding
self.burst_fwd = BurstForwarder(self.bts_data, self.bb_data)
self.burst_fwd.randomize_dl_toa256 = self.randomize_dl_toa256
self.burst_fwd.randomize_ul_toa256 = self.randomize_ul_toa256
self.burst_fwd.randomize_dl_rssi = self.randomize_dl_rssi
self.burst_fwd.randomize_ul_rssi = self.randomize_ul_rssi
# Share a BurstForwarder instance between BTS and BB
self.bts_ctrl.burst_fwd = self.burst_fwd
self.bb_ctrl.burst_fwd = self.burst_fwd
# Provide clock to BTS
self.bts_clck = UDPLink(self.bts_addr,
self.bts_base_port + 100, self.bts_base_port)
self.clck_gen = CLCKGen([self.bts_clck])
self.bts_ctrl.clck_gen = self.clck_gen
print("[i] Init complete")
# Enter main loop
while True:
socks = [self.bts_ctrl.sock, self.bb_ctrl.sock,
self.bts_data.sock, self.bb_data.sock]
# Wait until we get any data on any socket
r_event, w_event, x_event = select.select(socks, [], [])
# Downlink: BTS -> BB
if self.bts_data.sock in r_event:
self.burst_fwd.bts2bb()
# Uplink: BB -> BTS
if self.bb_data.sock in r_event:
self.burst_fwd.bb2bts()
# CTRL commands from BTS
if self.bts_ctrl.sock in r_event:
data, addr = self.bts_ctrl.sock.recvfrom(128)
self.bts_ctrl.handle_rx(data.decode(), addr)
# CTRL commands from BB
if self.bb_ctrl.sock in r_event:
data, addr = self.bb_ctrl.sock.recvfrom(128)
self.bb_ctrl.handle_rx(data.decode(), addr)
def shutdown(self):
print("[i] Shutting down...")
# Stop clock generator
self.clck_gen.stop()
def print_copyright(self):
print(COPYRIGHT)
def print_help(self, msg = None):
s = " Usage: " + sys.argv[0] + " [options]\n\n" \
" Some help...\n" \
" -h --help this text\n\n"
s += " TRX interface specific\n" \
" -R --bts-addr Set BTS remote address (default %s)\n" \
" -r --bb-addr Set BB remote address (default %s)\n" \
" -P --bts-base-port Set BTS base port number (default %d)\n" \
" -p --bb-base-port Set BB base port number (default %d)\n\n"
s += " Simulation\n" \
" --rand-dl-rssi Enable DL RSSI randomization\n" \
" --rand-ul-rssi Enable UL RSSI randomization\n" \
" --rand-dl-toa Enable DL ToA randomization\n" \
" --rand-ul-toa Enable UL ToA randomization\n"
print(s % (self.bts_addr, self.bb_addr,
self.bts_base_port, self.bb_base_port))
if msg is not None:
print(msg)
def parse_argv(self):
try:
opts, args = getopt.getopt(sys.argv[1:],
"R:r:P:p:h",
[
"help",
"bts-addr=", "bb-addr=",
"bts-base-port=", "bb-base-port=",
"rand-dl-rssi", "rand-ul-rssi",
"rand-dl-toa", "rand-ul-toa",
])
except getopt.GetoptError as err:
self.print_help("[!] " + str(err))
sys.exit(2)
for o, v in opts:
if o in ("-h", "--help"):
self.print_help()
sys.exit(2)
elif o in ("-R", "--bts-addr"):
self.bts_addr = v
elif o in ("-r", "--bb-addr"):
self.bb_addr = v
elif o in ("-P", "--bts-base-port"):
self.bts_base_port = int(v)
elif o in ("-p", "--bb-base-port"):
self.bb_base_port = int(v)
# Message field randomization
elif o == "rand-dl-rssi":
self.randomize_dl_rssi = True
elif o == "rand-ul-rssi":
self.randomize_ul_rssi = True
elif o == "rand-dl-toa":
self.randomize_dl_toa256 = True
elif o == "rand-ul-toa":
self.randomize_ul_toa256 = True
# Ensure there is no overlap between ports
if self.bts_base_port == self.bb_base_port:
self.print_help("[!] BTS and BB base ports should be different")
sys.exit(2)
bts_ports = [
self.bts_base_port + 0, self.bts_base_port + 100,
self.bts_base_port + 1, self.bts_base_port + 101,
self.bts_base_port + 2, self.bts_base_port + 102,
]
bb_ports = [
self.bb_base_port + 0, self.bb_base_port + 100,
self.bb_base_port + 1, self.bb_base_port + 101,
self.bb_base_port + 2, self.bb_base_port + 102,
]
for p in bb_ports:
if p in bts_ports:
self.print_help("[!] BTS and BB ports overlap detected")
sys.exit(2)
def sig_handler(self, signum, frame):
print("Signal %d received" % signum)
if signum is signal.SIGINT:
self.shutdown()
sys.exit(0)
if __name__ == '__main__':
app = Application()
app.run()
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