Adds the highest-leverage reverse-engineering primitive from the roadmap: one
path to turn a live operation buffer into a committable golden fixture. Unblocks
every capture-tier item (R0.5, R1.x, R2.1).
- ProtocolCaptureSanitizer: redacts identity-bearing values (host, tag, user,
machine) from a native buffer in BOTH ASCII and UTF-16LE, overwriting in place
with an 'X' fill so length and every field offset are preserved (keeps the
fixture useful for byte-layout RE). ASCII-letter matching is case-insensitive;
secrets < 3 chars are skipped to avoid collision corruption. AssertNoSecretsRemain
is a fail-closed safety net that refuses to emit if any value survives.
- ProtocolFixtureWriter: serializes a capture to fixtures/protocol/<op>/<name>.json
with sanitized hex, length, SHA-256 of the sanitized bytes, and a scrub report.
Timestamps are passed in (deterministic / testable).
- capture-tag-info CLI command: captures a live GetTagInfoFromName response and
writes the fixture. The same native bytes ride inside 2023 R2 gRPC
GetTagInfosFromName, so the fixture is transport-agnostic.
- 11 unit tests for the sanitizer/writer (test project now references the RE tool).
- First real fixture: get-tag-info/analog-*.json — a 98-byte Int4 CTagMetadata
buffer captured live from the local Historian 2020 server, tag name redacted,
verified to contain no identity (descriptor 03 c3 00 31 = Int4, as documented).
180 non-live unit tests green.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Joseph Doherty
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