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Author	SHA1	Message	Date
romanettandClaude Opus 5.5	b03575b4e2	Run the interop tests against six foreign OPC UA stacks and extend feature coverage (#4644) ... ## Proposed changes Runs the interop fixtures added in #4630 against peers built on six other open source OPC UA stacks, so the 2.0 client and server are tested against independent implementations, not only the released 1.5.378 stack. It also extends the fixtures beyond read/write/browse to events, subscriptions, identity and more services. ### Peers (`tests/Opc.Ua.Interop.Peers`) | Peer | Stack | Toolchain | Roles | | --- | --- | --- | --- | | `node-opcua` | node-opcua 2.186.15 (MIT) | Node.js 24 | server, client | | `milo` | Eclipse Milo 1.1.7 (EPL-2.0) | Java 17+, Maven | server, client | | `asyncua` | opcua-asyncio 2.0.1 (LGPL-3.0) | Python 3.12 | server, client | | `open62541` | open62541 1.5.8 (MPL-2.0), OpenSSL backend | C, CMake | server, client, ECC | | `async-opcua` | async-opcua 0.19.0 (MPL-2.0) | Rust | server, client | | `gopcua` | gopcua 0.9.1 (MIT) | Go | client only | Every peer speaks the command line and stdout contract of `Opc.Ua.Interop.LegacyPeer` (`server` / `client --checks`, `PEER-INFO {json}`, `RESULT {json}`). The stacks are fetched at build time and run as separate processes; nothing is linked into or shipped with any package. ### Harness - **Peer selection:** `OPCUA_INTEROP_PEER_HOST` + `OPCUA_INTEROP_PEER_HOST_ARGUMENTS` choose the host (`node`, `java -jar`, `python`) for the peer named by `OPCUA_INTEROP_LEGACY_PEER`. Native peers (open62541, async-opcua, gopcua) run without a host. Unset, the 1.5.378 peer runs exactly as before, so the main CI is unchanged. - **`PEER-INFO {json}`:** stack, version, application URI, software version and, optionally, the security policies the peer implements. `LegacyServerInteropTests` compares the ApplicationUri and SoftwareVersion against it. `EccInteropTests` runs policies beyond the four 1.05 ECC policies only against a peer that declares them. - **`expected-differences.json` per peer:** confirmed defects of a stack, keyed by check name, `Fixture.Test` or a `*` prefix, each with the source file or spec section that shows it. A listed failure is reported as inconclusive with its reason; a listed test that passes produces a warning. The 2.0 client tests apply it through the fixture-level `[PeerDifferences]` action. ### New coverage (all peers, including the 1.5.378 peer) - **16 client checks**, run by each peer's client against the 2.0 server (`LegacyClientFeatureCheckAsync`, Basic256Sha256 SignAndEncrypt): EventSubscription, ConditionRefresh, AlarmAcknowledge, DeadbandFilter, QueueOverflow, Triggering, Republish, TransferSubscription, WrongPasswordRejected, X509UserToken, RegisterNodes, HistoryReadRaw, NodeManagement, IndexRange, FindServers, SessionReconnect. - **`ServerFeatureInteropTests`**: the 2.0 client against each peer server. It covers RaiseEvent, ConditionRefresh, absolute deadband, queue overflow bit, triggering, republish errors, transfer to a new session, X509 user token, RegisterNodes, IndexRange, AddNodes/DeleteNodes, FindServers and session reconnect. Every peer server gained a `RaiseEvent` method and accepts X509 user tokens. - **ECC:** with open62541's OpenSSL backend, `EccInteropTests` adds `ECC_nistP256_AesGcm` and `ECC_nistP256_ChaChaPoly` (both directions; SignAndEncrypt anonymous and username, Sign, and token renewal across two renewals). It also adds `ECC_curve25519`/`ECC_curve448` cases, which are ignored while 2.0 marks those policies unsupported. ### CI and docs - **Workflow `interop-foreign.yml`:** opt-in (nightly, `workflow_dispatch`, PRs labelled `interop`), not a required check. It builds all six peers on Windows, Linux and macOS (open62541 from source on Linux only, against the distro OpenSSL), with dependency caching. - **`tests/Opc.Ua.Interop.Peers/README.md`:** how to install the toolchains, build each peer (including Windows without Visual Studio), run the fixtures against it, maintain expected differences and add a new stack. `DeveloperGuide.md` links to it. ## Results Run locally, sequentially, net10.0, Windows. Not passed = expected differences, inconclusive by design (e.g. AddNodes on a server without NodeManagement), or ECC cases a peer or the platform does not support. | Peer | Fixtures | Total | Passed | Failed | | --- | --- | --- | --- | --- | | 1.5.378 | whole interop project | 220 | 218 | 0 | | node-opcua | server + client + feature | 145 | 143 | 0 | | Eclipse Milo | server + client + feature | 145 | 141 | 0 | | asyncua | server + client + feature | 145 | 133 | 0 | | open62541 (OpenSSL) | server + client + feature + ECC | 199 | 175 | 0 | | async-opcua | server + client + feature | 145 | 137 | 0 | | gopcua | client | 104 | 81 | 0 | After the AEAD cases were added, `EccInteropTests` against the 1.5.378 peer ran separately: 54 total, 26 passed, 0 failed. The new cases are ignored there because the peer does not declare them. ## Findings No 2.0 defects beyond the two now fixed in #4654: - Browse with a null ViewId and a Timestamp now returns `Bad_ViewTimestampInvalid`. - Subscription transfer no longer fails when the optional `Server.GetMonitoredItems` is unavailable. After #4654 merges, `TransferSubscriptionToNewSessionAsync` can drop its expected differences for asyncua. Upstream defects found, all listed in the peers' `expected-differences.json` with evidence; issues are still to be filed: - **All five non-.NET stacks:** cannot handle the TestData `ScalarStructureDataType` (fields of the abstract Enumeration/Structure/BaseDataType). Milo encodes the abstract `Enumeration` field as a Variant (Part 6 5.2.4 says Int32). - **open62541:** - **Sign-only ECC keys:** derives encryption key and IV into the HKDF length for Sign-only ECC (Part 6 6.8.1), so Sign mode fails for the four 1.05 curves. The AEAD policies are not affected. - **HMAC mismatch:** reported as `Bad_InternalError`. - **ConditionRefresh:** needs the experimental A&C option. - **Response too large:** closes the connection instead of answering `Bad_ResponseTooLarge`. - **Array limit:** no MaxArrayLength. - **gopcua:** - **RsaPss:** `RSAOAEPMinPaddingSHA256` is 130 instead of 66, which breaks `Aes256_Sha256_RsaPss`. - **Nil LocalizedText:** encoding a nil `*LocalizedText` panics. - **asyncua server:** - **Queue overflow:** no Overflow bit. - **SetTriggering:** not implemented. - **Republish:** answers Good for an unknown sequence number or subscription. - **GetMonitoredItems:** not implemented. - **IndexRange:** ignored on Read and Write. - **Reconnect:** closes a session without subscriptions on transport loss. - **Limits:** no BrowseNext; operation limits not enforced; no `Bad_ResponseTooLarge`. - **async-opcua:** - **X509 user token (client):** treats an empty token SecurityPolicyUri as None. - **Reconnect (client):** overwrites the session nonce with the channel nonce on reconnect. - **ConditionRefresh (server):** not implemented. - **Overflow bit (server):** set without the DataValue InfoType bit. - **ECC:** no ECC policies. - **Milo:** - **Wrong password:** `BadIdentityTokenInvalid` instead of `BadUserAccessDenied` / `BadIdentityTokenRejected`. - **Array limit:** accepts arrays above its advertised MaxArrayLength. - **AddNodes:** answers `BadNotSupported`. ## Related Issues - Follows #4630. Related fixes: #4654. ## Types of changes - [x] Test / CI only ## Checklist - [x] Interop fixtures pass locally against all seven peers (net10.0, Windows). - [x] `dotnet format whitespace --verify-no-changes` on the changed C# files. - [ ] `interop-foreign.yml` has not run on GitHub yet; it needs a manual dispatch or the `interop` label. 🤖 Generated with [Claude Code](https://claude.com/claude-code) --------- Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>	2026-10-05 12:03:05 +02:00