[PR #2291] [CLOSED] Apply host DNS settings on peer state change #14929

New Issue

saavagebueno · 2026-08-05T03:06:37-04:00

saavagebueno commented

2026-08-05 03:06:37 -04:00

📋 Pull Request Information

Original PR: https://github.com/netbirdio/netbird/pull/2291
Author: @hurricanehrndz
Created: 7/19/2024
Status: ❌ Closed

Base: main ← Head: poc_DNS_on_peer_state_change

📝 Commits (10+)

ec290ba Trigger additional DNS probes on peer conn status
65fbdb2 Fix lint issues
a632acc Disable upstream if ns private and 0 peers
1157e13 Better comment for trigger DNS probe on connstatus
81aed5d Set handler to disable when nsgroup disabled
25e47ff Drop atomic bool when probing on peer change
814369b Update when aPeerConnStatusChanged is closed
8db48a1 Reduce unnecessary complexity
571885c Refactor make more readable and thread safe
5dc65bc Log if nsgroup is enabled

📊 Changes

10 files changed (+474 additions, -149 deletions)

View changed files

📝 client/internal/dns/host.go (+2 -1)
📝 client/internal/dns/server.go (+37 -17)
📝 client/internal/dns/server_test.go (+22 -1)
📝 client/internal/dns/upstream.go (+118 -101)
➕ client/internal/dns/upstream_probe.go (+9 -0)
➕ client/internal/dns/upstream_probe_darwin.go (+163 -0)
📝 client/internal/dns/upstream_test.go (+16 -12)
📝 client/internal/peer/status.go (+100 -17)
📝 client/internal/peer/status_test.go (+6 -0)
📝 client/server/server.go (+1 -0)

📄 Description

Describe your changes

This is a PoC and a potential fix #2002. This patch is not full fleshed out and their are some unattended side effects, but I wanted to get your thoughts and opinions @mlsmaycon and @pascal-fischer and @lixmal.

More Info:

This essential tries to ensure that host dns changes aren't applied til at least one routing peer is connected and DNS servers are reachable. It does so by tying deactivation and reactivation of upstream servers to Peerlist state changes in the status recorder.

As it stands, now status -d doesn't accurately reflect the status on first connection. That is because I haven't figure out an effective method to deactivate the servers without more intense changes. Primarily because of how the deactivate and reactivate callbacks are structure and their dependence of the removeIndex. One potential workaround is to modify deactivate to skip applying host config, so that we can fix this side effect.

Thoughts and discussion please

Issue ticket number and link

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)
Extended the README / documentation, if necessary

_{🔄 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/2291 **Author:** [@hurricanehrndz](https://github.com/hurricanehrndz) **Created:** 7/19/2024 **Status:** ❌ Closed **Base:** `main` ← **Head:** `poc_DNS_on_peer_state_change` --- ### 📝 Commits (10+) - [`ec290ba`](https://github.com/netbirdio/netbird/commit/ec290ba2dc9a13e5ee3e8aff8150da0116e4beed) Trigger additional DNS probes on peer conn status - [`65fbdb2`](https://github.com/netbirdio/netbird/commit/65fbdb2dd484cd0e99de121fd278d88a00de2b1b) Fix lint issues - [`a632acc`](https://github.com/netbirdio/netbird/commit/a632accb6268be45e3d67d15fe60c4401c9af856) Disable upstream if ns private and 0 peers - [`1157e13`](https://github.com/netbirdio/netbird/commit/1157e131d8aa1214cdc4c97476b74d6c1c0e7cff) Better comment for trigger DNS probe on connstatus - [`81aed5d`](https://github.com/netbirdio/netbird/commit/81aed5de80f015a34667e1abd687f14171d6052c) Set handler to disable when nsgroup disabled - [`25e47ff`](https://github.com/netbirdio/netbird/commit/25e47ff0d67f01f6c0096563a0cd8f0336fb965a) Drop atomic bool when probing on peer change - [`814369b`](https://github.com/netbirdio/netbird/commit/814369b2f8b952ca896be71a59c7afa855af4ec3) Update when aPeerConnStatusChanged is closed - [`8db48a1`](https://github.com/netbirdio/netbird/commit/8db48a1388e0a1f46273ae05cb9991470e055b63) Reduce unnecessary complexity - [`571885c`](https://github.com/netbirdio/netbird/commit/571885ca836caad5702d05006c2fb6a1456f663c) Refactor make more readable and thread safe - [`5dc65bc`](https://github.com/netbirdio/netbird/commit/5dc65bc471588ccb750d0a5d619b60960db30b82) Log if nsgroup is enabled ### 📊 Changes **10 files changed** (+474 additions, -149 deletions) <details> <summary>View changed files</summary> 📝 `client/internal/dns/host.go` (+2 -1) 📝 `client/internal/dns/server.go` (+37 -17) 📝 `client/internal/dns/server_test.go` (+22 -1) 📝 `client/internal/dns/upstream.go` (+118 -101) ➕ `client/internal/dns/upstream_probe.go` (+9 -0) ➕ `client/internal/dns/upstream_probe_darwin.go` (+163 -0) 📝 `client/internal/dns/upstream_test.go` (+16 -12) 📝 `client/internal/peer/status.go` (+100 -17) 📝 `client/internal/peer/status_test.go` (+6 -0) 📝 `client/server/server.go` (+1 -0) </details> ### 📄 Description ## Describe your changes This is a PoC and a potential fix #2002. This patch is not full fleshed out and their are some unattended side effects, but I wanted to get your thoughts and opinions @mlsmaycon and @pascal-fischer and @lixmal. More Info: This essential tries to ensure that host dns changes aren't applied til at least one routing peer is connected and DNS servers are reachable. It does so by tying deactivation and reactivation of upstream servers to Peerlist state changes in the status recorder. As it stands, now `status -d` doesn't accurately reflect the status on first connection. That is because I haven't figure out an effective method to deactivate the servers without more intense changes. Primarily because of how the deactivate and reactivate callbacks are structure and their dependence of the removeIndex. One potential workaround is to modify deactivate to skip applying host config, so that we can fix this side effect. Thoughts and discussion please ## Issue ticket number and link ### Checklist - [ ] Is it a bug fix - [ ] Is a typo/documentation fix - [x] Is a feature enhancement - [x] It is a refactor - [ ] Created tests that fail without the change (if possible) - [ ] Extended the README / documentation, if necessary --- <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 03:06:37 -04:00

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Reference: DYNR/netbird#14929