[PR #6382] [client] Fix Darwin DNS parsing for empty scutil values #28132

New Issue

saavagebueno · 2026-08-05T08:05:50-04:00

saavagebueno commented

2026-08-05 08:05:50 -04:00

📋 Pull Request Information

Original PR: https://github.com/netbirdio/netbird/pull/6382
Author: @vgauzzi
Created: 6/9/2026
Status: 🔄 Open

Base: main ← Head: fix-darwin-empty-dns-array-values

📝 Commits (1)

b8ae60b Fix Darwin DNS parsing for empty scutil values

📊 Changes

2 files changed (+131 additions, -33 deletions)

View changed files

📝 client/internal/dns/host_darwin.go (+103 -33)
📝 client/internal/dns/host_darwin_test.go (+28 -0)

📄 Description

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 DNS detection on macOS by ignoring empty or invalid entries and normalizing server addresses so DNS resolution is more reliable.
Tests
- Added a unit test to ensure empty/invalid DNS entries are skipped and valid addresses are selected and normalized.

_{🔄 This issue represents a GitHub Pull Request. It cannot be merged through Gitea due to API limitations.}

## 📋 Pull Request Information **Original PR:** https://github.com/netbirdio/netbird/pull/6382 **Author:** [@vgauzzi](https://github.com/vgauzzi) **Created:** 6/9/2026 **Status:** 🔄 Open **Base:** `main` ← **Head:** `fix-darwin-empty-dns-array-values` --- ### 📝 Commits (1) - [`b8ae60b`](https://github.com/netbirdio/netbird/commit/b8ae60b305b8cacd7aa3ddf2c8986f656742af62) Fix Darwin DNS parsing for empty scutil values ### 📊 Changes **2 files changed** (+131 additions, -33 deletions) <details> <summary>View changed files</summary> 📝 `client/internal/dns/host_darwin.go` (+103 -33) 📝 `client/internal/dns/host_darwin_test.go` (+28 -0) </details> ### 📄 Description ## 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 DNS detection on macOS by ignoring empty or invalid entries and normalizing server addresses so DNS resolution is more reliable. * **Tests** * Added a unit test to ensure empty/invalid DNS entries are skipped and valid addresses are selected and normalized.  --- <sub>🔄 This issue represents a GitHub Pull Request. It cannot be merged through Gitea due to API limitations.</sub>

saavagebueno added the pull-request label 2026-08-05 08:05:50 -04:00

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Reference: DYNR/netbird#28132