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Known issues — current

Status as of v1.8.8 (2026-07-10).

Open

SAP ACE wire protocol

OpenADS speaks its own documented wire protocol on tcp:// / tls://. It is not byte-compatible with the proprietary SAP Advantage 11.x/12.x TCP protocol. Talking to a legacy ADS server as a drop-in client requires a future SapWireTransport layer (ads:// / sap:// URIs).

CDX rollback to SAP ACE (error 7017)

OpenADS reads SAP-built CDX files without modification. Once OpenADS writes a CDX (append, reindex, INDEX ON, etc.), the file uses Harbour's DBFCDX layout (magic RCHB at offset 0x14). SAP ACE does not recognize that header and returns error 7017 (Corrupt .ADI, .CDX, or .IDX index). Rollback is not automatic — back up original .cdx files before migration, or delete and rebuild all tags under SAP after reverting. See Migrating from ADS for the full checklist.

OEM national collations beyond PL852

Only the Polish CP-852 table (NTXPL852 / PL852) is implemented. Other OEM_CHAR_SET values SAP supports in adslocal.cfg (MAZOVIA, additional NTX* variants, GREEK437, RUSSIAN, …) are recognised but leave the default at raw byte order. Tracked as issue #127.

Activation for OEM apps is zero-config since v1.8.9-dev: a table opened with usCharType = ADS_OEM (rddads AdsSetCharType(ADS_OEM)) picks up the default OEM collation from adslocal.cfg (OEM_CHAR_SET=NTXPL852, file next to openace64.dll or in the current directory) or from the OPENADS_OEM_COLLATION environment variable (which wins when both are set). AdsSetCollation(hConn, ...) stays available as a per-connection override. If OEM data was indexed on v1.8.6/v1.8.7 (which built UPPER() keys without CP-852 casing), run REINDEX once after configuring the collation.

The default OEM collation is applied by the in-process engine (LocalServer). openads_serverd remote connections do not yet propagate the client's char type to the server.

CDX INDEX ON write performance

CDX REINDEX and AdsCreateIndex* now use the bulk bottom-up B+tree build (v1.8.0) and, for the key-collection phase, direct driver reads that preserve the read-ahead cache instead of per-record goto_record (which invalidated the cache on every step). This targets the ~11× gap reported for local rddads INDEX ON vs. SAP ACE on real DBFCDX workloads (issue #128). Further parity work may be needed for expression evaluation (e.g. UPPER/VAL on OEM data) and multi-tag resync overheads. Tracked as issue #128.

SAP-imported Data Dictionary permissions

For .add files created by SAP Data Architect, per-table group permission levels are encoded in encrypted 8-byte blobs that OpenADS cannot decode yet. Imported DDs may show full DML for every group where SAP shows read-only access. Use pmsys_imported.add (via tools/import_dd) or grant permissions from OpenADS-native tooling.

TLS certificate verification

tls:// verifies peer certificates by default. Self-signed or private-CA endpoints require either a CA bundle (future AdsSetTlsCa entry point) or the dev-only environment variable OPENADS_TLS_INSECURE=1.

Server-side TLS termination

Client-side TLS (tls:// in ace64.dll) is implemented via mbedtls. openads_serverd does not terminate TLS natively — front it with nginx, Caddy, or stunnel. See TLS deployment.

Studio LocalServer auth

LocalServer mode (Studio embedded in ace64.dll / ace32.dll) has no HTTP Basic auth. The default bind is 127.0.0.1; if you set OPENADS_STUDIO_HOST=0.0.0.0, put the console behind a reverse proxy that handles authentication. Remote Server mode (openads_serverd) supports --http-user user:password.

DDL execution

ALTER TABLE, DROP TABLE, and DROP INDEX are parsed but backend execution hooks are not wired yet.

Load-flaky timing tests quarantined ([flaky])

Seven timing-sensitive cases fail intermittently on loaded/shared CI runners while passing everywhere else (different victims across identical runs — the flake signature): the two connection-storm cases in abi_remote_create_stress_test.cpp, OpenIndex on exclusive-held bag (abi_openindex_create_race_test.cpp, strict 6106 vs 7040 order-dependence), Teardown batching: dirty flush travels alone under a park (network_teardown_batch_test.cpp, intermittent SIGSEGV), and — since v1.09.63 — the three MT contention cases in abi_mt_contention_test.cpp that share verify_mt (8-writer key counts at :165, walk length at :193, walk order at :186; observed failing on the TLS leg and the release Ubuntu leg, always the remote-server variant, e.g. prev=[Charlie]@1 cur=[Alice]@12). They are tagged [flaky], excluded from the default and slow ctest tiers (still runnable explicitly, e.g. openads_unit_tests -tc=*storm*), and tracked here until de-flaked properly. They blocked four consecutive releases via the all-or-nothing gate (v1.09.52–56 era) — quarantining the suite is what lets releases proceed while the races are investigated. OPEN QUESTION (v1.09.64): the :186 backward key jump happened on a quiescent post-join tree, which a pure load flake cannot explain — it smells like a shape-dependent duplicate-ordering issue in the remote ordered-skip path (this test deliberately stresses duplicate-key page splits with 10 shared names). If it reproduces deterministically for a given tree shape it gets a real fix, not just quarantine; until then the quarantine holds the gate.

Closed recently

  • Linux/macOS CI and release builds broken (NTXPL852 tests) — fixed v1.8.2: shared polish_oem_fixture.h; Clang -Wstring-concatenation / greedy \x escape errors in unit tests.
  • OrdScope / AdsSetScope on character fields — fixed v1.8.1: unpadded scope strings (Harbour hb_itemGetCLen) are now space-padded to index key_length before comparison — work-order setScopeTop / setScopeBottom + gotop on local and remote.
  • NTXPL852 / PL852 OEM collation — fixed v1.8.0: CDX build, seek, insert, and reindex honour the PL852 sort table; AdsSetCollation accepts NTXPL852 / PL852.
  • CDX REINDEX per-record rebuild — improved v1.8.0: bulk build_bulk() path for CDX tags.
  • Remote AdsSetScope / OrdScope ignored — fixed v1.7.0: GotoTop/Skip now honour scoped key ranges over tcp://.
  • Remote OrdKeyCount() returns 0 — fixed v1.6.5: new GetKeyCount wire opcode; xBrowse grids show the correct filtered row count.
  • AdsGetDate() crash on remote Date fields — fixed v1.6.5: RemoteIndex handles resolve to the parent RemoteTable before field I/O.
  • Numeric dbSeek not-found on aliased CDX tags — fixed v1.6.x: seek path converts raw double keys to the stored FoxNumeric / ASCII form; alias qualifiers stripped on the read side.
  • Conditional index re-create stale order — fixed v1.6.x: in-place CREATE INDEX on an open bag rebinds expression, FOR, and the active order (abi_cond_refilter_no_close_test).
  • WSL2 / Linux -Werror=conversion build failures — fixed: narrowing casts and linkage issues in ace_exports.cpp; Linux CI green on v1.7.0.
  • Remote FiveWin / TDataBase field I/O — fixed v1.6.4: Date columns, ordinal-as-pointer idiom, unlocked-write EG_UNLOCKED parity.
  • Remote xBrowse index navigation — fixed v1.6.3: AdsKeyNo, bookmark GotoRecord sync, AdsAtBOF at first key.
  • VFP header 0x32 (autoinc + nullable) — fixed v1.5.1.
  • Plus SQLite / MSSQL read-only — fixed v1.5.1: navigational write.
  • Remote AdsSetRelation / AdsSetRecord / AdsCustomizeAOF — fixed v1.5.1 (Fase 2).

See CHANGELOG.md for the full per-release breakdown.

Safe listener defaults (security hardening)

openads_serverd now binds 127.0.0.1 by default, including the setup wizard. Explicit host values in existing INI files still override this default. Existing clients and wire payloads are unchanged. A non-loopback bind without auth_user is rejected unless the operator explicitly selects --allow_anonymous (allow_anonymous=true in INI). The same gate applies to an enabled Studio listener without http_user. All non-loopback TCP listeners emit a cleartext warning, including those with authentication. This is exposure mitigation, not native TLS: use the documented TLS proxy, and firewall its cleartext backend so only the proxy can reach it. Do not expose TCP credentials to untrusted networks. Credential hardening: new DD passwords use salted PBKDF2-SHA256. Existing plaintext password entries are verified in constant time and migrated after successful named login; unknown or invalid users are never migrated. Password property 1101 is now write-only through AdsDDGetUserProperty. This deliberately breaks applications that read passwords back. Named logins now require a valid password even if LOG_IN_REQUIRED is disabled, preventing AdsSys impersonation. Legacy anonymous local dictionary setup still works; it is not a network grant.

Security hardening limits: network Mutex Lock is now fail-fast on contention, not an infinite wait for timeout=0. Applications must retry. Network idle sessions expire after 5 minutes; handshake and incomplete frames after 30 seconds. Maximum 256 tables/cursors and 64 created mutexes per connection.

Explicit and AppendBlank record locks are capped at 4096 per session; SQL-generated append locks remain under review.