fix: expose the responder MAC address in mediated SSDP scan results (#2885)

[Pierre-Gilles]

Fixes #2885

⚠️ This pull request was produced by an automated routine (Claude Code) and has NOT been reviewed by a human. Please review it carefully — in particular the "What a human must check before merge" section below — before merging.

Description

(a) What changed and why

POST /api/integration/v1/network_discovery/scan with { "type": "ssdp" } returned only source_ip, source_port and headers. An external integration that discovers a Wake-on-LAN capable device over SSDP (the LG webOS case in the issue, but also game consoles, TVs, NAS…) therefore still had to ask the user to find and type the device's MAC address by hand before it could call POST /api/integration/v1/network/wake.

The core runs network=host, so a device that has just answered the M-SEARCH is normally already resolved in the kernel neighbour table. The scan now reads /proc/net/arp once, after the capture window closes, and adds an optional source_mac to each result when the responder IP is resolved there:

{
  "source_ip": "192.168.1.71",
  "source_mac": "64:e4:a5:b4:88:74",
  "source_port": 49363,
  "headers": "HTTP/1.1 200 OK\r\n..."
}

Design notes:

• Best-effort and optional, exactly as the issue proposes. A non-Linux host, an unreadable /proc/net/arp, an incomplete neighbour entry (all-zero hardware address) or a responder behind a router simply yields no source_mac — never an error, and the scan still never throws.
• No new authorization surface. The manifest is unchanged, no new field, no new endpoint. The core reads its own neighbour table for IPs that just talked to it during a scan the integration was already authorized to run — it does not probe, ping or sweep anything.
• One read per scan, not one per result.
• MAC addresses are normalized to lowercase.
• Scope is deliberately limited to the ssdp type, which is what the issue asks for. udp-broadcast / udp-active-broadcast / mdns are untouched.

Files:

• server/lib/external-integration/networkDiscovery/networkDiscovery.scanSsdp.js — new exported readArpTable() helper + source_mac enrichment in scanSsdp().
• docs/specs/external-integrations.md — B.16 result shape for ssdp updated in the same diff, as required by the spec-first rule in AGENTS.md.
• server/test/lib/external-integration/externalIntegration.networkDiscovery.test.js — new tests.

(b) What was verified locally

Run from /server after npm install:

• npm run prettier-check → All matched files use Prettier code style! (repo-wide)
• npm run eslint → ✖ 29 problems (0 errors, 29 warnings) — 0 errors; none of the warnings are in the files touched by this PR (all pre-existing, in unrelated services/tests)
• Targeted Mocha run of test/lib/external-integration/externalIntegration.networkDiscovery.test.js → 29 passing, 0 failing, including the 4 new tests:
  • should expose the source MAC address when the neighbour table resolves it
  • should omit the source MAC address when the responder is not in the neighbour table
  • should map the resolved neighbours and skip the entries without a usable MAC
  • should return an empty map when the neighbour table cannot be read
• Coverage (c8) restricted to lib/external-integration/networkDiscovery/**: networkDiscovery.scanSsdp.js → 100% statements, 100% branches, 100% functions, 100% lines
• Broader run of test/lib/external-integration/** + test/controllers/integrationHost/** → 661 passing, 1 failing. The single failure is Integration host API › /api/integration/v1/container › should start, stop and restart a declared sub-container (500 instead of 200): it needs a working Docker daemon, which this sandbox does not have. Verified pre-existing — it fails identically on master with the changes stashed.

Not run here: the full npm run coverage suite (~4100 tests), the front checks (no front change) and Cypress (no UI change).

(c) What a human must check before merge

1. Real-hardware validation. Nothing here was tested against an actual SSDP responder on a real LAN. Please run a real scanNetwork('ssdp', …) against a device (e.g. the LG webOS case from the issue) and confirm source_mac really comes back and matches the device.
2. Is /proc/net/arp the right source? It is the simplest dependency-free option and works on the Linux hosts Gladys ships on, but it is IPv4-only and deprecated in favour of ip neigh / NETLINK on some distributions. Confirm it is populated inside the official Docker image (network=host, so /proc/net/arp is the host's table — worth a sanity check on a real install, including a Raspberry Pi / ARM64 one).
3. Timing. The table is read after the timeout window. In principle the kernel resolved the responder during the exchange, but on a busy or slow network an entry could still be incomplete or already expired. Confirm the hit rate is good enough in practice, or say if you would rather have the read happen earlier / be retried.
4. Privacy / product call. MAC addresses are stable device identifiers. They only reach integrations that the user already authorized to run an SSDP scan, and no new manifest declaration is introduced — but if you would rather gate this behind an explicit authorization (e.g. reuse network_wake, or a new flag), that is a product decision this routine should not make on its own.
5. Scope. Should udp-broadcast and udp-active-broadcast results get the same treatment? The issue only asked for SSDP, so this PR stays there.
6. Spec wording in docs/specs/external-integrations.md (B.16) — please check it reads the way you want, since that file is the source of truth for the ecosystem SDK.

Checklist

• Tests pass: targeted server tests + 100% coverage on the changed file (full npm run coverage not run locally — CI will)
• Linter and prettier pass on the server (no front change)
• No undocumented breaking change — source_mac is purely additive and optional

---

Generated by Claude Code

Summary by CodeRabbit

• New Features

  • Network discovery results may now include the SSDP responder’s source MAC address when available.
  • MAC addresses are validated and normalized for consistent formatting.

• Bug Fixes

  • Discovery continues gracefully when neighbor information is unavailable, incomplete, or unreadable.

• Documentation

  • Updated the network discovery API specification to document the optional source_mac response field.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

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📒 Files selected for processing (3)

• docs/specs/external-integrations.md
• server/lib/external-integration/networkDiscovery/networkDiscovery.scanSsdp.js
• server/test/lib/external-integration/externalIntegration.networkDiscovery.test.js

🚧 Files skipped from review as they are similar to previous changes (3)

• docs/specs/external-integrations.md
• server/test/lib/external-integration/externalIntegration.networkDiscovery.test.js
• server/lib/external-integration/networkDiscovery/networkDiscovery.scanSsdp.js

Included review availability: Your plan includes up to 8 reviews per rolling hour; 4 remain after this review.

---

📝 Walkthrough

Walkthrough

The SSDP network discovery response can include an optional, lowercased source_mac. The scan reads the ARP table once, ignores unusable entries and read failures, and preserves the original response shape when no mapping exists.

Changes

SSDP source MAC enrichment

Layer / File(s)	Summary
ARP parsing and response contract server/lib/external-integration/networkDiscovery/networkDiscovery.scanSsdp.js, server/test/lib/external-integration/externalIntegration.networkDiscovery.test.js, docs/specs/external-integrations.md	readArpTable parses valid IPv4-to-MAC mappings and normalizes MAC addresses. The API documentation defines optional source_mac. Tests cover valid and unusable entries, including read failures.
SSDP result enrichment server/lib/external-integration/networkDiscovery/networkDiscovery.scanSsdp.js, server/test/lib/external-integration/externalIntegration.networkDiscovery.test.js	scanSsdp resolves responder IPs after the SSDP scan and adds source_mac when available. Tests cover resolved and unresolved responders.

Estimated code review effort: 3 (Moderate) | ~20 minutes

Merge Risk: ⚪ Minimal · up to d9d4b

The PR adds an optional responder MAC address to SSDP scan results without changing existing behavior; no actionable merge-blocking risk remains after normal checks and review.

Sequence Diagram(s)

sequenceDiagram
  participant SSDPResponder
  participant scanSsdp
  participant readArpTable
  participant NetworkDiscoveryAPI
  SSDPResponder-->>scanSsdp: Return SSDP response with source_ip
  scanSsdp->>readArpTable: Read ARP table
  readArpTable-->>scanSsdp: Return source_mac or no mapping
  scanSsdp-->>NetworkDiscoveryAPI: Return enriched scan result

Loading

Suggested reviewers: atrovato

Poem

I hop through ARP rows neat and bright,
Then tuck MACs in SSDP’s flight.
If no address greets my nose,
The scan keeps its original pose.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly summarizes the main change: exposing responder MAC addresses in mediated SSDP scan results.
Linked Issues check	✅ Passed	The changes implement issue #2885 by adding optional, normalized source_mac values for resolvable SSDP responders and updating tests and documentation.
Out of Scope Changes check	✅ Passed	The changes remain within scope by modifying SSDP MAC resolution, its API specification, and related tests.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

✨ Finishing Touches

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• Create stacked PR
• Commit on current branch

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• Create PR with unit tests
• Commit unit tests in branch claude/issue-2885

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Actionable comments posted: 1

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Inline comments:
In
`@server/lib/external-integration/networkDiscovery/networkDiscovery.scanSsdp.js`:
- Around line 37-41: Update the ARP line parsing near macByIp.set to extract the
Flags field and only accept entries whose flags include the ATF_COM bit (0x2),
while retaining the existing IP and MAC validation. Add a fixture covering flags
0x0 with a valid nonzero MAC and ensure that entry is omitted.

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---

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📒 Files selected for processing (3)

• docs/specs/external-integrations.md
• server/lib/external-integration/networkDiscovery/networkDiscovery.scanSsdp.js
• server/test/lib/external-integration/externalIntegration.networkDiscovery.test.js

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.51%. Comparing base (a40d19f) to head (5c5d3c3).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2903   +/-   ##
=======================================
  Coverage   99.51%   99.51%           
=======================================
  Files        1235     1235           
  Lines       88064    88122   +58     
=======================================
+ Hits        87638    87696   +58     
  Misses        426      426           

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[cursor]

Stale comment

Small, additive, and well-tested. After an authorized SSDP scan the core reads /proc/net/arp once and attaches optional source_mac for responder IPs already in the neighbour table. Fail-closed (never throws), Host API still passes only { st, timeoutMs } so the test-only arpTablePath cannot be used to read arbitrary files, B.16 is updated in the same diff, and CI is green including codecov/patch.

Approve. Not risk:high — read-only lookup of IPs that just answered a scan the integration was already allowed to run; not a new LAN proxy and not a new endpoint.

needs:human-review (author is Pierre-Gilles → atrovato): MAC addresses are stable device identifiers. location and network_wake each have their own install-screen contract; this piggybacks on network_discovery SSDP, whose copy is only “SSDP search for {st}”. That is a product call this review should not make on its own — including for st: ssdp:all.

No DEVICE_FEATURE_CATEGORIES / DEVICE_FEATURE_TYPES changes.

What looks solid

• One ARP read per scan; only result.source_ip is looked up (the full neighbour table is not returned)
• Empty / incomplete / unreadable table → omit the field
• MAC regex + lowercase normalization
• Tests cover hit, miss, all-zero MAC, incomplete, short line, missing file

Residuals (non-blocking)

1. Hit rate on a real LAN — Linux does not create ARP entries from inbound UDP; the table is usually filled because the responder ARPs for us first. If it already has Gladys’s MAC cached, source_mac may be absent. Needs the hardware check called out in the PR (LG webOS / #2885).
2. Stale neighbour after DHCP reuse — source_mac is whatever the kernel currently maps; treat it as a hint for WoL, not a guarantee.
3. Scope stays SSDP-only, as the issue asked; udp-broadcast / udp-active-broadcast / mdns unchanged.
4. C.8 still does not list scanNetwork / wakeOnLan (pre-existing SDK lag, same as #2864).
5. writeFakeArpTable leaves temp dirs behind.

  

_{Sent by Cursor Automation: Automatic PR review}

[cursor]

Follow-up d9d4b0b addresses the previous review. readArpTable() now requires ATF_COM (0x2) before exposing a MAC (with fixtures for flags 0x0 + nonzero MAC omitted, and 0x6 / ATF_PERM|ATF_COM kept). The post-scan comment, JSDoc, and B.16 no longer imply that answering the M-SEARCH fills the neighbour table; the result tuple is { source_ip, source_mac?, source_port, headers }. Host API still calls scanSsdp({ st, timeoutMs }) only, so the test-only arpTablePath cannot be used to read arbitrary files. Fail-closed, one ARP read per scan, full neighbour table is never returned.

Approve. Not risk:high — read-only lookup of IPs that already answered a scan the integration was authorized to run; not a new LAN proxy and not a new endpoint.

Keep needs:human-review (author is Pierre-Gilles → atrovato). MAC addresses are stable identifiers. location and network_wake each have an install-screen contract; this still piggybacks on network_discovery SSDP (“SSDP search for {st}”), including st: ssdp:all. The follow-up correctly left that as a product call. No DEVICE_FEATURE_CATEGORIES / DEVICE_FEATURE_TYPES changes.

What this commit adds

• Stale NUD_FAILED neighbours (kernel still prints the last n->ha) are no longer returned.
• B.16 now states that a missing source_mac is ordinary.
• New tests plus existing SSDP cases all passed in CI; networkDiscovery.scanSsdp.js is 100% statements/branches/functions/lines.

Residuals (non-blocking)

1. Real-LAN hit rate — still untested against an actual SSDP responder (LG webOS / #2885). Linux does not create ARP entries from inbound UDP.
2. Stale-but-complete neighbour after DHCP reuse — ATF_COM means resolved, not current. Treat source_mac as a WoL hint.
3. Scope stays SSDP-only, as the issue asked.
4. C.8 still does not list scanNetwork / wakeOnLan (pre-existing SDK lag).
5. writeFakeArpTable still leaves temp dirs behind.

CI note: Server test is red on two Device.migrate 2s timeouts. Those files are outside this diff and look like the existing parallel-suite flake, not this change. Front test, Server lint, Cypress, Front build, and Docker are green.

  

_{Sent by Cursor Automation: Automatic PR review}