[PR #6381] [client] Fix Darwin DNS parsing for empty scutil values #25584

New Issue

saavagebueno · 2026-08-05T07:06:12-04:00

saavagebueno commented

2026-08-05 07:06:12 -04:00

Original Pull Request: https://github.com/netbirdio/netbird/pull/6381

State: closed
Merged: No

Describe your changes

Fixes a Darwin DNS parsing panic when scutil returns an empty value in an array entry, for example:

SearchDomains : <array> {
  0 :
}

The parser previously indexed the result of splitting on " : ", which panicked for trimmed empty values such as 0 :. This change extracts values with strings.Cut, skips empty entries, and preserves the existing behavior for valid domain and nameserver entries.

Issue ticket number and link

N/A

Stack

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 client parser bug fix with no user-facing configuration or behavior changes.

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

Paste the PR link from https://github.com/netbirdio/docs here:

https://github.com/netbirdio/docs/pull/__

Testing

GOCACHE=/private/tmp/go-build-cache GOMODCACHE=/private/tmp/go-mod-cache go test ./client/internal/dns -run 'Test(ParseSystemDNSSettingsSkipsEmptyValues|SplitDomainsIntoBatches|GetOriginalNameservers)$' -count=1

Summary by CodeRabbit

Bug Fixes
- Improved macOS DNS settings parsing to properly skip and handle invalid or empty DNS entries, enhancing reliability of system DNS discovery.
Tests
- Added test coverage for macOS DNS settings parsing validation.

**Original Pull Request:** https://github.com/netbirdio/netbird/pull/6381 **State:** closed **Merged:** No --- ## Describe your changes Fixes a Darwin DNS parsing panic when `scutil` returns an empty value in an array entry, for example: ```text SearchDomains : <array> { 0 : } ``` The parser previously indexed the result of splitting on `" : "`, which panicked for trimmed empty values such as `0 :`. This change extracts values with `strings.Cut`, skips empty entries, and preserves the existing behavior for valid domain and nameserver entries. ## Issue ticket number and link N/A ## Stack  ### 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 client parser bug fix with no user-facing configuration or behavior changes. ### Docs PR URL (required if "docs added" is checked) Paste the PR link from https://github.com/netbirdio/docs here: https://github.com/netbirdio/docs/pull/__ ## Testing ```text GOCACHE=/private/tmp/go-build-cache GOMODCACHE=/private/tmp/go-mod-cache go test ./client/internal/dns -run 'Test(ParseSystemDNSSettingsSkipsEmptyValues|SplitDomainsIntoBatches|GetOriginalNameservers)$' -count=1 ```  ## Summary by CodeRabbit * **Bug Fixes** * Improved macOS DNS settings parsing to properly skip and handle invalid or empty DNS entries, enhancing reliability of system DNS discovery. * **Tests** * Added test coverage for macOS DNS settings parsing validation.

saavagebueno added the pull-request label 2026-08-05 07:06:12 -04:00

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Reference: DYNR/netbird#25584