Initial commit: simtrace2-pysniff v0.1.0
Python-based SIMtrace2 sniffer — drop-in replacement for simtrace2-sniff. Single dependency (pyusb), auto-reconnect, GSMTAP/PCAP output, library API. Modules: protocol.py — SIMtrace2 USB sniffing protocol parser device.py — USB discovery + SniffSession with exponential backoff reconnect gsmtap.py — GSMTAP UDP sender for Wireshark pcap.py — PCAP file writer (LINKTYPE_GSMTAP) dump.py — hex dump formatters + file output __main__.py — CLI entry point Startup script sniff-start.sh handles udev permission checks and shows install instructions. udev rule uses TAG+=uaccess (systemd-logind ACL).
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"""Tests for protocol.py message parsing."""
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import struct
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import unittest
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from simtrace2_pysniff.protocol import (
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parse_message,
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MSG_HDR_FMT,
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MSG_HDR_SIZE,
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MSG_HDR_SIZE,
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flags_to_names,
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CHANGE_FLAG_CARD_INSERT,
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CHANGE_FLAG_TIMEOUT_WT,
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DATA_FLAG_ERROR_CHECKSUM,
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DATA_FLAG_ERROR_MALFORMED,
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DATA_FLAG_ERROR_INCOMPLETE,
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SIMTRACE_MSGC_SNIFF,
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SIMTRACE_MSGT_SNIFF_CHANGE,
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SIMTRACE_MSGT_SNIFF_FIDI,
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SIMTRACE_MSGT_SNIFF_ATR,
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SIMTRACE_MSGT_SNIFF_PPS,
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SIMTRACE_MSGT_SNIFF_TPDU,
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)
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def _build_hdr(msg_class, msg_type, slot_nr=0, seq_nr=0, payload=b''):
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msg_len = MSG_HDR_SIZE + len(payload)
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return struct.pack(MSG_HDR_FMT, msg_class, msg_type, seq_nr, slot_nr, 0, msg_len) + payload
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class TestParseMessage(unittest.TestCase):
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def test_empty_buffer(self):
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msg, consumed = parse_message(b'')
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self.assertIsNone(msg)
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self.assertEqual(consumed, 0)
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def test_too_short_for_header(self):
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msg, consumed = parse_message(b'\x00' * 5)
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self.assertIsNone(msg)
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self.assertEqual(consumed, 0)
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def test_non_sniff_class_skipped(self):
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payload = b'junk_data'
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buf = _build_hdr(0, 0, payload=payload)
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msg, consumed = parse_message(buf)
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self.assertIsNone(msg)
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self.assertEqual(consumed, len(buf))
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def test_msg_len_smaller_than_header_skip(self):
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buf = _build_hdr(SIMTRACE_MSGC_SNIFF, SIMTRACE_MSGT_SNIFF_CHANGE)
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buf = bytearray(buf)
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struct.pack_into('<H', buf, 6, 4) # set msg_len to 4 (< MSG_HDR_SIZE)
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msg, consumed = parse_message(bytes(buf))
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self.assertIsNone(msg)
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self.assertEqual(consumed, MSG_HDR_SIZE)
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def test_incomplete_message_needs_more_data(self):
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buf = _build_hdr(SIMTRACE_MSGC_SNIFF, SIMTRACE_MSGT_SNIFF_ATR,
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payload=b'\x01\x02\x03')
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msg, consumed = parse_message(buf[:-2])
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self.assertIsNone(msg)
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self.assertEqual(consumed, 0)
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def test_change_message_card_insert(self):
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payload = struct.pack('<I', CHANGE_FLAG_CARD_INSERT)
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buf = _build_hdr(SIMTRACE_MSGC_SNIFF, SIMTRACE_MSGT_SNIFF_CHANGE,
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slot_nr=1, seq_nr=5, payload=payload)
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msg, consumed = parse_message(buf)
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self.assertEqual(consumed, len(buf))
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self.assertEqual(msg.type, 'change')
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self.assertEqual(msg.type_hex, '0x00')
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self.assertEqual(msg.slot_nr, 1)
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self.assertEqual(msg.seq_nr, 5)
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self.assertEqual(msg.flags, CHANGE_FLAG_CARD_INSERT)
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self.assertEqual(msg.data, b'')
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def test_change_message_timeout(self):
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payload = struct.pack('<I', CHANGE_FLAG_TIMEOUT_WT)
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buf = _build_hdr(SIMTRACE_MSGC_SNIFF, SIMTRACE_MSGT_SNIFF_CHANGE,
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payload=payload)
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msg, consumed = parse_message(buf)
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self.assertEqual(msg.type, 'change')
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self.assertEqual(msg.flags, CHANGE_FLAG_TIMEOUT_WT)
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def test_fidi_message(self):
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payload = struct.pack('<I', 0x97) # Fi=9, Di=7
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buf = _build_hdr(SIMTRACE_MSGC_SNIFF, SIMTRACE_MSGT_SNIFF_FIDI,
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payload=payload)
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msg, consumed = parse_message(buf)
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self.assertEqual(msg.type, 'fidi')
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self.assertEqual(len(msg.data), 0)
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self.assertEqual(msg.flags, 0x97)
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def test_atr_message(self):
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atr = b'\x3b\x9e\x12\x34\x56\x78\x90'
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payload = struct.pack('<IH', 0, len(atr)) + atr
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buf = _build_hdr(SIMTRACE_MSGC_SNIFF, SIMTRACE_MSGT_SNIFF_ATR,
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payload=payload)
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msg, consumed = parse_message(buf)
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self.assertEqual(consumed, len(buf))
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self.assertEqual(msg.type, 'atr')
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self.assertEqual(msg.data, atr)
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self.assertEqual(msg.flags, 0)
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def test_atr_message_with_flags(self):
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atr = b'\x3b\x00'
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flags = DATA_FLAG_ERROR_CHECKSUM | DATA_FLAG_ERROR_MALFORMED
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payload = struct.pack('<IH', flags, len(atr)) + atr
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buf = _build_hdr(SIMTRACE_MSGC_SNIFF, SIMTRACE_MSGT_SNIFF_ATR,
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payload=payload)
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msg, _ = parse_message(buf)
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self.assertEqual(msg.flags, flags)
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def test_pps_message(self):
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pps = b'\xff\x10\x97\x7e'
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payload = struct.pack('<IH', 0, len(pps)) + pps
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buf = _build_hdr(SIMTRACE_MSGC_SNIFF, SIMTRACE_MSGT_SNIFF_PPS,
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payload=payload)
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msg, consumed = parse_message(buf)
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self.assertEqual(msg.type, 'pps')
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self.assertEqual(msg.data, pps)
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def test_tpdu_message(self):
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tpdu = b'\xa0\xa4\x00\x00\x02\x3f\x00'
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payload = struct.pack('<IH', 0, len(tpdu)) + tpdu
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buf = _build_hdr(SIMTRACE_MSGC_SNIFF, SIMTRACE_MSGT_SNIFF_TPDU,
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payload=payload)
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msg, _ = parse_message(buf)
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self.assertEqual(msg.type, 'tpdu')
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self.assertEqual(msg.data, tpdu)
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def test_tpdu_flags_incomplete(self):
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tpdu = b'\x00\xb0\x00\x00\x0a'
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flags = DATA_FLAG_ERROR_INCOMPLETE
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payload = struct.pack('<IH', flags, len(tpdu)) + tpdu
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buf = _build_hdr(SIMTRACE_MSGC_SNIFF, SIMTRACE_MSGT_SNIFF_TPDU,
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payload=payload)
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msg, _ = parse_message(buf)
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self.assertEqual(msg.flags, flags)
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def test_timestamp_passed_through(self):
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buf = _build_hdr(SIMTRACE_MSGC_SNIFF, SIMTRACE_MSGT_SNIFF_CHANGE,
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payload=struct.pack('<I', 0))
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msg, _ = parse_message(buf, timestamp=12345.678)
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self.assertEqual(msg.timestamp, 12345.678)
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def test_multiple_messages_in_buffer(self):
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buf1 = _build_hdr(SIMTRACE_MSGC_SNIFF, SIMTRACE_MSGT_SNIFF_CHANGE,
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payload=struct.pack('<I', 1))
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atr_payload = struct.pack('<IH', 0, 2) + b'\x3b\x00'
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buf2 = _build_hdr(SIMTRACE_MSGC_SNIFF, SIMTRACE_MSGT_SNIFF_ATR,
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payload=atr_payload)
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combined = buf1 + buf2
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msg1, consumed1 = parse_message(combined)
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self.assertIsNotNone(msg1)
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self.assertEqual(msg1.type, 'change')
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self.assertEqual(consumed1, len(buf1))
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remaining = combined[consumed1:]
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msg2, consumed2 = parse_message(remaining)
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self.assertIsNotNone(msg2)
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self.assertEqual(msg2.type, 'atr')
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self.assertEqual(consumed2, len(buf2))
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def test_trailing_garbage_before_valid_message(self):
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msg1 = _build_hdr(0, 1, slot_nr=3, payload=b'card_emu_data!!!')
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buf = msg1 + _build_hdr(SIMTRACE_MSGC_SNIFF, SIMTRACE_MSGT_SNIFF_CHANGE,
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payload=struct.pack('<I', 1))
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msg, consumed = parse_message(buf)
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self.assertIsNone(msg)
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self.assertEqual(consumed, len(msg1))
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msg, consumed = parse_message(buf[len(msg1):])
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self.assertIsNotNone(msg)
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self.assertEqual(msg.type, 'change')
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def test_non_sniff_msg_class_with_short_msg_len(self):
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hdr = struct.pack(MSG_HDR_FMT, 0, 0, 0, 0, 0, 4)
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msg, consumed = parse_message(hdr + b'\x00')
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self.assertIsNone(msg)
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self.assertEqual(consumed, MSG_HDR_SIZE)
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def test_non_sniff_msg_class_known_len_skip(self):
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payload = b'test_data_for_cardem'
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buf = _build_hdr(1, 0, payload=payload)
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msg, consumed = parse_message(buf)
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self.assertIsNone(msg)
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self.assertEqual(consumed, len(buf))
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def test_zero_length_data(self):
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payload = struct.pack('<IH', 0, 0)
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buf = _build_hdr(SIMTRACE_MSGC_SNIFF, SIMTRACE_MSGT_SNIFF_ATR,
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payload=payload)
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msg, consumed = parse_message(buf)
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self.assertEqual(msg.type, 'atr')
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self.assertEqual(msg.data, b'')
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self.assertEqual(msg.flags, 0)
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def test_truncated_data_hdr(self):
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buf = _build_hdr(SIMTRACE_MSGC_SNIFF, SIMTRACE_MSGT_SNIFF_TPDU,
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payload=b'\x00\x00\x00\x00\x10')
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msg, consumed = parse_message(buf)
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self.assertIsNone(msg)
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self.assertEqual(consumed, len(buf))
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class TestFlagsToNames(unittest.TestCase):
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def test_empty(self):
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self.assertEqual(flags_to_names(0, {}), [])
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def test_single(self):
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names = flags_to_names(CHANGE_FLAG_CARD_INSERT, {
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CHANGE_FLAG_CARD_INSERT: 'card inserted',
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})
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self.assertEqual(names, ['card inserted'])
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def test_multiple(self):
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names = flags_to_names(
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CHANGE_FLAG_CARD_INSERT | CHANGE_FLAG_TIMEOUT_WT,
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{
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CHANGE_FLAG_CARD_INSERT: 'card inserted',
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CHANGE_FLAG_TIMEOUT_WT: 'timeout',
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}
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)
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self.assertEqual(names, ['card inserted', 'timeout'])
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def test_unknown_bit_preserved(self):
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names = flags_to_names(0xDEAD0000, {})
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self.assertIn('unknown(0xdead0000)', names)
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if __name__ == '__main__':
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unittest.main()
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