[PR #6999] [client] Handle interface lookup errors in iOS DNS index helper #30085

New Issue

saavagebueno · 2026-08-05T08:10:02-04:00

saavagebueno commented

2026-08-05 08:10:02 -04:00

Original Pull Request: https://github.com/netbirdio/netbird/pull/6999

State: closed
Merged: Yes

Describe your changes

getInterfaceIndex in the iOS upstream DNS resolver dereferenced the result of net.InterfaceByName before checking the error, so a missing interface (e.g. during teardown or renaming) caused a nil-pointer panic instead of a DNS client error.

The helper now returns a wrapped error before touching the interface; the only caller, GetClientPrivate, already propagates the error.

The helper moved to an un-build-tagged file so it can be unit-tested on host platforms while remaining available to the iOS build. Added a test covering the missing-interface path. Verified with the new host test, an iOS arm64 CGO compile, and git diff --check.

Issue ticket number and link

N/A

Stack

Standalone PR based on main.

Checklist

Is it a bug fix
Is a typo/documentation fix
Is a feature enhancement
It is a refactor
Created tests that fail without the change (if possible)
This change does not modify the public API, gRPC protocols, functionality behavior, CLI / service flags, or introduce a new feature — OR I have discussed it with the NetBird team beforehand (link the issue / Slack thread in the description). See CONTRIBUTING.md.

By submitting this pull request, you confirm that you have read and agree to the terms of the Contributor License Agreement.

Documentation

Select exactly one:

I added/updated documentation for this change
Documentation is not needed for this change (explain why)

Internal crash fix in the iOS DNS path; no user-facing behavior or configuration changes.

Docs PR URL (required if "docs added" is checked)

N/A

Summary by CodeRabbit

Bug Fixes
- Improved handling of network interface lookup failures with clearer error messages that identify the affected interface.
- Added validation for network interface lookups, including reliable error handling when an interface cannot be found.
Tests
- Added coverage for both successful interface resolution and missing-interface scenarios.

**Original Pull Request:** https://github.com/netbirdio/netbird/pull/6999 **State:** closed **Merged:** Yes --- ## Describe your changes `getInterfaceIndex` in the iOS upstream DNS resolver dereferenced the result of `net.InterfaceByName` before checking the error, so a missing interface (e.g. during teardown or renaming) caused a nil-pointer panic instead of a DNS client error. The helper now returns a wrapped error before touching the interface; the only caller, `GetClientPrivate`, already propagates the error. The helper moved to an un-build-tagged file so it can be unit-tested on host platforms while remaining available to the iOS build. Added a test covering the missing-interface path. Verified with the new host test, an iOS arm64 CGO compile, and `git diff --check`. ## Issue ticket number and link N/A ## Stack  Standalone PR based on `main`. ### Checklist - [x] Is it a bug fix - [ ] Is a typo/documentation fix - [ ] Is a feature enhancement - [ ] It is a refactor - [x] Created tests that fail without the change (if possible) - [x] This change does **not** modify the public API, gRPC protocols, functionality behavior, CLI / service flags, or introduce a new feature — **OR** I have discussed it with the NetBird team beforehand (link the issue / Slack thread in the description). See [CONTRIBUTING.md](https://github.com/netbirdio/netbird/blob/main/CONTRIBUTING.md#discuss-changes-with-the-netbird-team-first). > By submitting this pull request, you confirm that you have read and agree to the terms of the [Contributor License Agreement](https://github.com/netbirdio/netbird/blob/main/CONTRIBUTOR_LICENSE_AGREEMENT.md). ## Documentation Select exactly one: - [ ] I added/updated documentation for this change - [x] Documentation is **not needed** for this change (explain why) Internal crash fix in the iOS DNS path; no user-facing behavior or configuration changes. ### Docs PR URL (required if "docs added" is checked) N/A  ## Summary by CodeRabbit * **Bug Fixes** * Improved handling of network interface lookup failures with clearer error messages that identify the affected interface. * Added validation for network interface lookups, including reliable error handling when an interface cannot be found. * **Tests** * Added coverage for both successful interface resolution and missing-interface scenarios.

saavagebueno added the pull-request label 2026-08-05 08:10:02 -04:00

saavagebueno closed this issue

2026-08-05 08:10:02 -04:00

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Reference: DYNR/netbird#30085