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Restore support for "Override local DNS" (#2438)

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Tailscale allows to override the local DNS settings of a node via
"Override local DNS" [1]. Restore this flag with the same config setting
name `dns.override_local_dns` but disable it by default to align it with
Tailscale's default behaviour.

Tested with Tailscale 1.80.2 and systemd-resolved on Debian 12.

With `dns.override_local_dns: false`:

```
Link 12 (tailscale0)
Current Scopes: DNS
     Protocols: -DefaultRoute -LLMNR -mDNS -DNSOverTLS DNSSEC=no/unsupported
   DNS Servers: 100.100.100.100
    DNS Domain: tn.example.com ~0.e.1.a.c.5.1.1.a.7.d.f.ip6.arpa [snip]
```

With `dns.override_local_dns: true`:

```
Link 12 (tailscale0)
Current Scopes: DNS
     Protocols: +DefaultRoute -LLMNR -mDNS -DNSOverTLS DNSSEC=no/unsupported
   DNS Servers: 100.100.100.100
    DNS Domain: tn.example.com ~.
```

[1] https://tailscale.com/kb/1054/dns#override-local-dns

Fixes: #2256
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nblock 2025-04-17 17:16:59 +02:00 • committed by GitHub
parent 0fbe392499
commit 1e0516b99d
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12 changed files with 113 additions and 12 deletions
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integration/hsic/config.go
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@ -23,6 +23,7 @@ func DefaultConfigEnv() map[string]string {
"HEADSCALE_PREFIXES_V6": "fd7a:115c:a1e0::/48",
"HEADSCALE_DNS_BASE_DOMAIN": "headscale.net",
"HEADSCALE_DNS_MAGIC_DNS": "true",
"HEADSCALE_DNS_OVERRIDE_LOCAL_DNS": "false",
"HEADSCALE_DNS_NAMESERVERS_GLOBAL": "127.0.0.11 1.1.1.1",
"HEADSCALE_PRIVATE_KEY_PATH": "/tmp/private.key",
"HEADSCALE_NOISE_PRIVATE_KEY_PATH": "/tmp/noise_private.key",