catarrh/simtrace-analyser
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083924c9768c25c7cc3fe955ed685788198a53f8
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5 Commits
Author SHA1 Message Date
catarrh 083924c976 Add context-aware decoding for GET RESPONSE and TERMINAL RESPONSE 
decode.py:
- decode_cat: TERMINAL RESPONSE (0x14) now extracts the proactive
  command type from its echoed Command Details (tag 81) — no history
  lookup needed since TR carries its own type
- decode_message gains prev param; GET RESPONSE (0xC0) resolves
  'response_for' from the previous command when its SW1 was 0x61,
  else None (orphaned)
- decode_sniff_msg threads prev through

database.py:
- _row_to_message accepts prev; new _decode_rows tracks previous-TPDU
  context in sequence; get_messages/get_messages_after seed context
  from the message before the window/cursor

tests: TR cat_command + GET RESPONSE context/orphaned cases (49 total)
 2026-08-12 19:41:57 +03:00
catarrh 2a58fec0a3 Fix dropped change flags + FIDI parsing 
- capture.py: DirectSniffer/GsmtapListener yield (type, data, flags),
  CaptureManager passes flags to insert_message (change flags were
  previously dropped, leaving every change row with flags=0)
- protocol.py: add _parse_fidi (1-byte value) — FIDI was mis-mapped to
  _parse_change (4-byte flags), so FIDI messages were silently dropped
- database.py: pass flags into decode_sniff_msg
- decode.py: decode_change(flags) reads flags directly; decode_sniff_msg
  gains flags parameter; change messages no longer require non-empty data
- tests: fix FIDI test, add change/fidi decode tests (43 total)
 2026-08-12 19:25:14 +03:00
catarrh 11d0f29b6a Add CAT (TS 102 223) command decoding + fix AUTHENTICATE naming 
- CAT_COMMAND_TYPES: complete Type of Command table from TS 102 223 §9.4
- ENVELOPE_TYPES: D1-D7 envelope tags
- parse_tlv(): minimal BER-TLV parser
- decode_cat(): FETCH → proactive command name (via D0→81 type byte);
  ENVELOPE → envelope type name
- AUTHENTICATE (0x88/0x89) unified to 'AUTHENTICATE' (no suffix)
- decoded dict gains 'cat_command' field for FETCH/ENVELOPE
- tests/test_decode.py: 14 new tests (TLV, naming, CAT, tables)
 2026-08-12 18:26:58 +03:00
catarrh e211dd91bc Add decode for change, fidi, atr, pps message types 
decode_sniff_msg() dispatches to type-specific decoders:
- change: 4-byte flags bitmask → card insert/eject/reset/timeout
- fidi: 1-byte Fi/Di index → decoded values
- atr/pps: raw hex value
database.py now decodes all message types, not just tpdu.
 2026-08-12 17:46:03 +03:00
catarrh 7ada4345b8 Add server-side APDU decoder (decode.py) 
Pure Python, no dependencies. Decodes raw TPDU bytes into
structured JSON: CLA bitfield, INS->name via APDU_SPEC table,
P1/P2 field breakdown, body extraction, SW name lookup.
~40 command types, 40+ SW codes, known FID notes.

database.py: _row_to_message() calls decode_message() for tpdu
messages, adding 'decoded' field to API responses.

Decoding happens at query time, not storage time — no schema
migration, all past sessions get decode retroactively.
 2026-08-12 17:21:25 +03:00