2017-07-28 07:56:09 +00:00
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#!/usr/bin/env python2
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# -*- coding: utf-8 -*-
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# Simple tool to send custom messages via TRX DATA interface,
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# which may be also useful for fuzzing and testing
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#
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# (C) 2017 by Vadim Yanitskiy <axilirator@gmail.com>
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#
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# All Rights Reserved
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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 2 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 along
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# with this program; if not, write to the Free Software Foundation, Inc.,
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# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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import random
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import signal
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import getopt
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import select
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import sys
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from udp_link import UDPLink
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from rand_burst_gen import RandBurstGen
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COPYRIGHT = \
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"Copyright (C) 2017 by Vadim Yanitskiy <axilirator@gmail.com>\n" \
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"License GPLv2+: GNU GPL version 2 or later " \
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"<http://gnu.org/licenses/gpl.html>\n" \
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"This is free software: you are free to change and redistribute it.\n" \
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"There is NO WARRANTY, to the extent permitted by law.\n"
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class DATAInterface(UDPLink):
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# GSM PHY definitions
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GSM_HYPERFRAME = 2048 * 26 * 51
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def send_l1_msg(self, burst,
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tn = None, fn = None, rssi = None):
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# Generate random timeslot index if not preset
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if tn is None:
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tn = random.randint(0, 7)
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# Generate random frame number if not preset
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if fn is None:
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fn = random.randint(0, self.GSM_HYPERFRAME)
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# Generate random RSSI if not preset
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if rssi is None:
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rssi = -random.randint(-75, -50)
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# Prepare a buffer for header and burst
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buf = []
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# Put timeslot index
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buf.append(tn)
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# Put frame number
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buf.append((fn >> 24) & 0xff)
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buf.append((fn >> 16) & 0xff)
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buf.append((fn >> 8) & 0xff)
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buf.append((fn >> 0) & 0xff)
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# Put RSSI
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buf.append(rssi)
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# HACK: put fake TOA value
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buf += [0x00] * 2
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# Put burst
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buf += burst
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# Put two unused bytes
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buf += [0x00] * 2
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# Send message
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self.send(bytearray(buf))
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def send_trx_msg(self, burst,
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tn = None, fn = None, pwr = None):
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# Generate random timeslot index if not preset
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if tn is None:
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tn = random.randint(0, 7)
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# Generate random frame number if not preset
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if fn is None:
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fn = random.randint(0, self.GSM_HYPERFRAME)
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# Generate random power level if not preset
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if pwr is None:
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pwr = random.randint(0, 34)
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# Prepare a buffer for header and burst
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buf = []
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# Put timeslot index
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buf.append(tn)
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# Put frame number
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buf.append((fn >> 24) & 0xff)
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buf.append((fn >> 16) & 0xff)
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buf.append((fn >> 8) & 0xff)
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buf.append((fn >> 0) & 0xff)
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# Put transmit power level
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buf.append(pwr)
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# Put burst
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buf += burst
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# Send message
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self.send(bytearray(buf))
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class Application:
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# Application variables
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remote_addr = "127.0.0.1"
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base_port = 5700
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conn_mode = "TRX"
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burst_type = None
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burst_count = 1
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2017-08-03 13:34:39 +00:00
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pwr = None
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fn = None
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tn = None
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2017-07-28 07:56:09 +00:00
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def __init__(self):
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self.print_copyright()
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self.parse_argv()
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# Set up signal handlers
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signal.signal(signal.SIGINT, self.sig_handler)
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def run(self):
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# Init DATA interface with TRX or L1
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if self.conn_mode == "TRX":
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self.data_if = DATAInterface(self.remote_addr,
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self.base_port + 2, self.base_port + 102)
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elif self.conn_mode == "L1":
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self.data_if = DATAInterface(self.remote_addr,
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self.base_port + 102, self.base_port + 2)
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else:
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self.print_help("[!] Unknown connection type")
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sys.exit(2)
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# Init random burst generator
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self.gen = RandBurstGen()
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2017-08-03 13:34:39 +00:00
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# Generate a random frame number or use provided one
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if self.fn is None:
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fn = random.randint(0, DATAInterface.GSM_HYPERFRAME)
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else:
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fn = self.fn
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2017-07-28 07:56:09 +00:00
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# Send as much bursts as required
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for i in range(self.burst_count):
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# Generate a random burst
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if self.burst_type == "NB":
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buf = self.gen.gen_nb()
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elif self.burst_type == "FB":
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buf = self.gen.gen_fb()
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elif self.burst_type == "SB":
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buf = self.gen.gen_sb()
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elif self.burst_type == "AB":
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buf = self.gen.gen_ab()
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else:
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self.print_help("[!] Unknown burst type")
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self.shutdown()
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sys.exit(2)
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2017-08-03 13:34:39 +00:00
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print("[i] Sending %d/%d %s burst (fn=%u) to %s..."
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% (i + 1, self.burst_count, self.burst_type,
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fn, self.conn_mode))
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2017-07-28 07:56:09 +00:00
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# Send to TRX or L1
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if self.conn_mode == "TRX":
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2017-08-03 13:34:39 +00:00
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self.data_if.send_trx_msg(buf,
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self.tn, fn, self.pwr)
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2017-07-28 07:56:09 +00:00
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elif self.conn_mode == "L1":
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2017-08-03 13:34:39 +00:00
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self.data_if.send_l1_msg(buf,
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self.tn, fn, self.pwr)
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# Increase frame number (for count > 1)
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fn = (fn + 1) % DATAInterface.GSM_HYPERFRAME
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2017-07-28 07:56:09 +00:00
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self.shutdown()
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def print_copyright(self):
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print(COPYRIGHT)
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def print_help(self, msg = None):
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s = " Usage: " + sys.argv[0] + " [options]\n\n" \
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" Some help...\n" \
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" -h --help this text\n\n"
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s += " TRX interface specific\n" \
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" -m --conn-mode Send bursts to: TRX (default) / L1\n" \
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" -r --remote-addr Set remote address (default %s)\n" \
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" -p --base-port Set base port number (default %d)\n\n"
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s += " Burst generation\n" \
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" -b --burst-type Random burst type (NB, FB, SB, AB)\n" \
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" -c --burst-count How much bursts to send (default 1)\n" \
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" -f --frame-number Set frame number (default random)\n" \
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" -t --timeslot Set timeslot index (default random)\n" \
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" -l --power-level Set transmit level (default random)\n" \
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2017-07-28 07:56:09 +00:00
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print(s % (self.remote_addr, self.base_port))
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if msg is not None:
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print(msg)
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def parse_argv(self):
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try:
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opts, args = getopt.getopt(sys.argv[1:],
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"m:r:p:b:c:f:t:l:h",
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[
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"help",
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"conn-mode=",
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"remote-addr=",
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"base-port=",
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"burst-type=",
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"burst-count=",
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2017-08-03 13:34:39 +00:00
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"frame-number=",
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"timeslot=",
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"power-level=",
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2017-07-28 07:56:09 +00:00
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])
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except getopt.GetoptError as err:
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self.print_help("[!] " + str(err))
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sys.exit(2)
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for o, v in opts:
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if o in ("-h", "--help"):
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self.print_help()
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sys.exit(2)
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elif o in ("-m", "--conn-mode"):
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self.conn_mode = v
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elif o in ("-r", "--remote-addr"):
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self.remote_addr = v
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elif o in ("-p", "--base-port"):
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self.base_port = int(v)
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elif o in ("-b", "--burst-type"):
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self.burst_type = v
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elif o in ("-c", "--burst-count"):
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self.burst_count = int(v)
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2017-08-03 13:34:39 +00:00
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elif o in ("-f", "--frame-number"):
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self.fn = int(v)
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elif o in ("-t", "--timeslot"):
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self.tn = int(v)
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elif o in ("-l", "--power-level"):
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self.pwr = abs(int(v))
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2017-07-28 07:56:09 +00:00
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def shutdown(self):
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self.data_if.shutdown()
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def sig_handler(self, signum, frame):
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print("Signal %d received" % signum)
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if signum is signal.SIGINT:
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self.shutdown()
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sys.exit(0)
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if __name__ == '__main__':
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app = Application()
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app.run()
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