OsmocomBB MS-side GSM Protocol stack (L1, L2, L3) including firmware https://osmocom.org/projects/baseband
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osmocom-bb/src/target/trx_toolkit/test_data_dump.py

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#!/usr/bin/env python3
# -*- coding: utf-8 -*-
# TRX Toolkit
# Unit tests for DATA capture management
#
# (C) 2019 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.
import unittest
import tempfile
import random
from gsm_shared import *
from data_dump import *
class DATADump_Test(unittest.TestCase):
def setUp(self):
# Create a temporary file
self._tf = tempfile.TemporaryFile(mode = 'w+b')
# Create an instance of DATA dump manager
self._ddf = DATADumpFile(self._tf)
# Compare message a with message b
def _compare_msg(self, a, b):
# Make sure we're comparing messages of the same type
self.assertEqual(a.__class__, b.__class__)
# Compare common header fields
self.assertEqual(a.ver, b.ver)
self.assertEqual(a.fn, b.fn)
self.assertEqual(a.tn, b.tn)
# Burst bits (if present)
self.assertEqual(a.burst, b.burst)
# TxMsg specific fields
if isinstance(a, TxMsg):
self.assertEqual(a.pwr, b.pwr)
# RxMsg specific fields
if isinstance(a, RxMsg):
# Version independent fields
self.assertEqual(a.toa256, b.toa256)
self.assertEqual(a.rssi, b.rssi)
# Version specific fields
if a.ver >= 1:
self.assertEqual(a.nope_ind, b.nope_ind)
self.assertEqual(a.mod_type, b.mod_type)
self.assertEqual(a.tsc_set, b.tsc_set)
self.assertEqual(a.tsc, b.tsc)
self.assertEqual(a.ci, b.ci)
# Generate a random message of a given type / version
def _gen_rand_message(self, cls, ver = 1):
msg = cls(ver = ver)
msg.rand_hdr()
msg.rand_burst()
return msg
# Generate a list of random messages
def _gen_rand_messages(self, cls, count, ver = 1):
msg_list = []
for _ in range(count):
msg = self._gen_rand_message(cls, ver)
msg_list.append(msg)
return msg_list
# Generate a mixed list of random messages
def _gen_rand_message_mix(self, count, ver = 1):
msg_list = []
msg_list += self._gen_rand_messages(RxMsg, count)
msg_list += self._gen_rand_messages(TxMsg, count)
random.shuffle(msg_list)
return msg_list
def _test_store_and_parse(self, cls):
msg_ref = self._gen_rand_message(cls)
self._ddf.append_msg(msg_ref)
msg = self._ddf.parse_msg(0)
self._compare_msg(msg, msg_ref)
# Store one Rx message in a file, read it back and compare
def test_store_and_parse_rx_msg(self):
self._test_store_and_parse(RxMsg)
# Store one Tx message in a file, read it back and compare
def test_store_and_parse_tx_msg(self):
self._test_store_and_parse(TxMsg)
# Store multiple Rx/Tx messages in a file, read them back and compare
def test_store_and_parse_all(self):
# Store a mixed list of random messages (19 + 19)
msg_list_ref = self._gen_rand_message_mix(19)
self._ddf.append_all(msg_list_ref)
# Retrieve and compare stored messages
msg_list = self._ddf.parse_all()
for i in range(len(msg_list_ref)):
self._compare_msg(msg_list[i], msg_list_ref[i])
# Verify random access to stored messages
def test_parse_msg_idx(self):
# Store a mixed list of random messages (19 + 19)
msg_list_ref = self._gen_rand_message_mix(19)
self._ddf.append_all(msg_list_ref)
# Random access
for _ in range(100):
idx = random.randrange(len(msg_list_ref))
msg = self._ddf.parse_msg(idx)
self._compare_msg(msg, msg_list_ref[idx])
def test_parse_empty(self):
with self.assertLogs(level = 'ERROR'):
for idx in range(100):
msg = self._ddf.parse_msg(idx)
self.assertEqual(msg, None)
def test_parse_all_empty(self):
msg_list = self._ddf.parse_all()
self.assertEqual(msg_list, [])
def test_parse_len_overflow(self):
# Write a malformed message directly
self._tf.write(DATADump.TAG_TxMsg)
self._tf.write(b'\x00\x63') # 99
self._tf.write(b'\xff' * 90)
with self.assertLogs(level = 'ERROR'):
msg = self._ddf.parse_msg(0)
self.assertEqual(msg, None)
def test_parse_unknown_tag(self):
# Write a malformed message directly
self._tf.write(b'\x33')
self._tf.write(b'\x00\x63') # 99
self._tf.write(b'\xff' * 90)
with self.assertLogs(level = 'ERROR'):
msg = self._ddf.parse_msg(0)
self.assertEqual(msg, None)
if __name__ == '__main__':
unittest.main()