unlock/patch: preserve SCSI sense across the bridge; init aborts on dead bus; slow-retry first patch failure
Audit fixes (v1.1.0..HEAD regressions in the unlock migration + adaptive patch
speed):
- unlock_bridge ScsiAdapter: libfreemkv's transport returns Err on ANY non-zero
SCSI status (a normal CHECK CONDITION), not only transport faults. The adapter
was collapsing every such Err to { status: 0xFF, sense: None }, which discarded
the parsed sense and defeated the AACS handshake's ILLEGAL_REQUEST wedge guard
(so it kept hammering the drive — hard-rule #2) and inverted its
transport-vs-rejection diagnosis. Now reconstruct status + the 32-byte sense
buffer (sense_key@2, asc@12, ascq@13) and only emit 0xFF/None for a genuine
transport fault.
- Drive::init: a genuine transport fault during the drive-prep unlock means the
bus is dead — propagate it (the v1.1.0 invariant) instead of silently
swallowing it via `if let Ok`. Other errors (no matching unlocker) still fall
through to stock mode. SET CD SPEED max now runs only when the bus is alive.
- disc::patch: on the first read failure in a range, drop to slow recovery speed
and RE-ATTEMPT the same position at slow speed before marking it. A
single-sector range's first failing sector was being marked from a MAX-speed
read it never got to recover.
- docs: lib.rs architecture diagram (handshake → host_certs) and README (stale
pluggable-unlock-seam / register-unlocker / crates.io / docs.rs references).
This commit is contained in:
Matthew Jackson
@@ -6,19 +6,21 @@ Rust library for 4K UHD / Blu-ray / DVD optical drives. Drive access, disc scann
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DVDs (CSS) decrypt out of the box. Blu-ray and UHD (AACS) require a `keydb.cfg` (default `~/.config/freemkv/keydb.cfg`) supplying disc-specific volume unique keys; no AACS key material is compiled in.
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**12+ MB/s** sustained read speeds on BD. Drive prep routes through the pluggable unlock seam — register an unlocker and `init()` drives it; with none registered the library rips via the host-certificate AACS handshake.
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**12+ MB/s** sustained read speeds on BD. Drive prep (`init()`) handles unlocking internally via the `freemkv-unlock` crate — clients never see it; when no drive unlock applies, the library rips via the host-certificate AACS handshake.
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Multi-lingual by design — the library outputs structured data and numeric error codes, never English text. Build any UI or localization on top.
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**[API Documentation](https://docs.rs/libfreemkv)** · **[Technical Docs](docs/)**
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**[Source & API](https://github.com/freemkv/libfreemkv)** · **[Technical Docs](docs/)**
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Part of the [freemkv](https://github.com/freemkv) project.
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## Install
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Consumed by git tag (not published to crates.io):
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```toml
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[dependencies]
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libfreemkv = "1.0.0-rc.1"
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libfreemkv = { git = "https://github.com/freemkv/libfreemkv", tag = "vX.Y.Z" }
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```
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## Quick Start
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@@ -30,7 +32,7 @@ use std::path::Path;
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// Open drive — identified via INQUIRY
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let mut drive = Drive::open(Path::new("/dev/sg4"))?;
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drive.wait_ready()?; // wait for disc
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drive.init()?; // route through the unlock seam (if an unlocker is registered)
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drive.init()?; // unlock + prep (handled internally)
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drive.probe_disc()?; // probe disc surface for optimal speeds
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// Scan disc — UDF, playlists, streams, AACS (all automatic)
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@@ -98,7 +100,7 @@ loop {
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## What It Does
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- **Drive access** — open, identify, pluggable unlock seam, speed control, eject
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- **Drive access** — open, identify, internal unlock + prep, speed control, eject
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- **12+ MB/s reads** — auto-detects kernel transfer limits, sustained full speed
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- **Disc scanning** — UDF 2.50 filesystem, MPLS playlists, CLPI clip info
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- **Stream labels** — 5 BD-J format parsers (Paramount, Criterion, Pixelogic, CTRM, Deluxe)
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@@ -132,8 +134,8 @@ Blu-rays and UHD (AACS) require a `keydb.cfg` at `~/.config/freemkv/keydb.cfg` (
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```text
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Drive — open, identify, init, single-shot read
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├── ScsiTransport — SG_IO (Linux), IOKit (macOS), SPTI (Windows)
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└── Unlocker seam — pluggable trait + registry; concrete unlockers
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live in the separate freemkv-unlock repo
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└── unlock_bridge — private seam to the freemkv-unlock crate
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(firmware / AACS cert / CSS bus-auth unlockers)
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Disc — scan titles, streams, AACS/CSS state
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├── UDF reader — Blu-ray UDF 2.50 with metadata partitions
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+17
-5
@@ -2085,20 +2085,32 @@ impl Disc {
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}
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Err(err) => {
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// First failure in this range: the fast-batched pass over
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// the clean overshoot is done; drop to the slow recovery
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// speed for the rest of the range and arm the cooldown.
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// Idempotent — only the first failure issues SET CD SPEED.
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if !range_slowed {
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// the clean overshoot is done. A genuine transport fault
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// (bridge crash) is NOT a recoverable bad sector — let
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// handle_read_failure abort the pass immediately rather
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// than burn a slow re-read on a wedged bus.
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if !range_slowed && !err.is_scsi_transport_failure() {
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// Drop to the slow recovery speed, arm the cooldown,
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// and RE-ATTEMPT the same position at slow speed before
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// marking it. The drive's deep recovery (long re-reads
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// / ECC) only engages at the slow speed; the failure so
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// far is a fast-read miss. Hold the cursor (don't
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// advance, don't count damage) and retry — only a
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// slow-speed result reaches handle_read_failure below.
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// Without this, a single-sector range's first failing
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// sector was marked from a MAX-speed read it never got
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// to recover. range_slowed gates this to once per range.
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reader.set_speed(0x0000);
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tracing::info!(
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target: "freemkv::disc",
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phase = "patch_speed",
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lba,
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speed = "0x0000",
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"patch: range dropped to slow recovery speed on first read failure"
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"patch: range dropped to slow recovery speed; retrying the failing read at slow speed before marking"
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);
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range_slowed = true;
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cooldown_pending = true;
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continue;
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}
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match handle_read_failure(
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+25
-13
@@ -413,33 +413,45 @@ impl Drive {
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// the kind is Unknown — only an identity-keyed unlocker can match here.
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// The first matching unlocker runs; none matching leaves the drive in
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// stock mode so the host-cert AACS handshake (the OEM route) carries the
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// disc. An `Err` return means "nothing applied" — not a hard error; fall
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// through. (A transport fault during unlock is swallowed by the bridge
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// today, mirroring the old no-match fall-through.)
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// disc. A genuine transport fault means the bus is dead — abort init
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// (the v1.1.0 invariant; `if let Ok` was silently swallowing it). Every
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// other error (NotApplicable / no match) is "nothing applied" — fall
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// through to stock mode.
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self.init_ran = true;
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if let Ok(unlocked) = crate::unlock_bridge::run_unlockers(
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let r: Result<()> = match crate::unlock_bridge::run_unlockers(
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self.scsi.as_mut(),
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&self.drive_id,
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freemkv_unlock::DiscKind::Unknown,
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&[],
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) {
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Ok(unlocked) => {
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self.unlocker_name =
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crate::unlock_bridge::unlocker_name(&self.drive_id).map(str::to_string);
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// Stash the OEM Volume ID the unlocker returned for the AACS handshake
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// phase (do_handshake reads it via `oem_vid()`). A drive-prep unlocker
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// always carries a VID; guard anyway.
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// Stash the OEM Volume ID the unlocker returned for the AACS
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// handshake phase (do_handshake reads it via `oem_vid()`). A
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// drive-prep unlocker always carries a VID; guard anyway.
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if let Some(vid) = unlocked.vid {
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self.oem_vid = Some(vid);
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}
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Ok(())
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}
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Err(freemkv_unlock::UnlockError::Transport) => Err(Error::ScsiError {
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opcode: 0,
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status: crate::scsi::SCSI_STATUS_TRANSPORT_FAILURE,
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sense: None,
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}),
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Err(_) => Ok(()),
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};
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// Raise the drive to its maximum read speed with a generic SET CD SPEED —
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// UNCONDITIONALLY, whether or not an unlocker matched. A stock-mode BD/UHD
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// drive (no firmware unlocker) still wants max speed; gating this on an
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// unlocker match left such drives riplocked. (DVD returns earlier in
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// stock mode; its sweep sets DVD speed separately.) Best-effort: a
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// failure here must NOT fail the rip — a slow drive still rips.
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// UNCONDITIONALLY whenever the bus is alive (init didn't transport-fault),
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// whether or not an unlocker matched. A stock-mode BD/UHD drive (no
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// firmware unlocker) still wants max speed; gating this on an unlocker
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// match left such drives riplocked. (DVD returns earlier in stock mode;
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// its sweep sets DVD speed separately.) Best-effort: a failure here must
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// NOT fail the rip — a slow drive still rips.
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if r.is_ok() {
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self.set_speed(crate::speed::DriveSpeed::Max.to_kbps());
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let r: Result<()> = Ok(());
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}
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tracing::info!(
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target: "freemkv::drive",
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phase = "init",
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+1
-1
@@ -58,7 +58,7 @@
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//! ├── JAR parser -- BD-J audio track labels
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//! └── AACS -- encryption: key resolution + content decrypt
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//! ├── aacs -- KEYDB, VUK, MKB, unit decrypt
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//! └── handshake -- SCSI auth, ECDH, bus key
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//! └── host_certs -- collect host certs (cert handshake lives in freemkv-unlock)
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//! ```
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//!
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//! # AACS Encryption
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+25
-5
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bytes_transferred: r.bytes_transferred,
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sense: r.sense,
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}),
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// libfreemkv's transport returns Err only on a transport-layer fault.
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Err(_) => Err(fu::scsi::ScsiError {
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status: 0xFF,
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sense: None,
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}),
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// libfreemkv's transport returns Err for ANY non-zero SCSI status —
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// i.e. a normal drive CHECK CONDITION (ILLEGAL_REQUEST, etc.), NOT
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// only a transport-layer fault. Preserve the real status AND the
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// parsed sense across the seam: the AACS handshake's wedge guard
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// bails on an ILLEGAL_REQUEST sense (so it stops hammering the drive),
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// and its diagnosis distinguishes a cert rejection from a dead bus by
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// the same status/sense. Collapsing everything to 0xFF/None defeated
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// both. Reconstruct the 32-byte sense buffer at the offsets the
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// unlock crate reads (sense_key@2 low-nibble, asc@12, ascq@13); a
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// genuine transport fault (status 0xFF, no sense) maps through
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// unchanged.
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Err(e) => {
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let (status, sense) = crate::drive::extract_scsi_context(&e);
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let sense_buf = sense.map(|s| {
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let mut b = [0u8; 32];
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b[2] = s.sense_key & 0x0F;
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b[12] = s.asc;
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b[13] = s.ascq;
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b
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});
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Err(fu::scsi::ScsiError {
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status,
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sense: sense_buf,
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})
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}
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}
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}
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}
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Reference in New Issue
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