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## 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 <!-- branch-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 <!-- This is an auto-generated comment: release notes by coderabbit.ai --> ## 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. <!-- end of auto-generated comment: release notes by coderabbit.ai -->