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net/dns: always attempt to read the OS config on macOS/iOS

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Also reconfigure DNS on iOS/macOS on link changes.

Signed-off-by: Maisem Ali <maisem@tailscale.com>
This commit is contained in:
Maisem Ali
2022-09-22 14:38:09 -07:00
committed by Maisem Ali
parent 539c073cf0
commit 3555a49518
2 changed files with 37 additions and 16 deletions
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wgengine/userspace.go
+12 -9
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@@ -1187,15 +1187,18 @@ func (e *userspaceEngine) linkChange(changed bool, cur *interfaces.State) {
// suspend/resume or whenever NetworkManager is started, it
// nukes all systemd-resolved configs. So reapply our DNS
// config on major link change.
if (runtime.GOOS == "linux" || runtime.GOOS == "android") && changed {
e.wgLock.Lock()
dnsCfg := e.lastDNSConfig
e.wgLock.Unlock()
if dnsCfg != nil {
if err := e.dns.Set(*dnsCfg); err != nil {
e.logf("wgengine: error setting DNS config after major link change: %v", err)
} else {
e.logf("wgengine: set DNS config again after major link change")
if changed {
switch runtime.GOOS {
case "linux", "android", "ios", "darwin":
e.wgLock.Lock()
dnsCfg := e.lastDNSConfig
e.wgLock.Unlock()
if dnsCfg != nil {
if err := e.dns.Set(*dnsCfg); err != nil {
e.logf("wgengine: error setting DNS config after major link change: %v", err)
} else {
e.logf("wgengine: set DNS config again after major link change")
}
}
}
}