cmd/ctrld: do not change DNS for tailscale0

Let user decide which option is prefer.

cmd/ctrld/cli.go

@@ -26,16 +26,10 @@ import (
 	"github.com/Control-D-Inc/ctrld/internal/controld"
 )
 
-const (
-	tailscaleDevName = "tailscale0"
-	tailscaleDNS     = "100.100.100.100"
-)
-
 var (
 	v                    = viper.NewWithOptions(viper.KeyDelimiter("::"))
 	defaultConfigWritten = false
 	defaultConfigFile    = "ctrld.toml"
-	tailscaleIface       *net.Interface
 )
 
 var basicModeFlags = []string{"listen", "primary_upstream", "secondary_upstream", "domains", "log", "cache_size"}
@@ -612,9 +606,6 @@ func netIfaceFromName(ifaceName string) (*net.Interface, error) {
 		if i.Name == ifaceName {
 			iface = i.Interface
 		}
-		if i.Name == tailscaleDevName {
-			tailscaleIface = i.Interface
-		}
 	})
 	if iface == nil {
 		return nil, errors.New("interface not found")

cmd/ctrld/prog.go

@@ -46,12 +46,6 @@ func (p *prog) run() {
 			}
 		}
 	}
-	// Sorry, tailscale!
-	if tailscaleIface != nil {
-		if err := setDNS(tailscaleIface, []string{cfg.Listener["0"].IP}); err != nil {
-			mainLog.Warn().Err(err).Msg("could not set DNS for tailscale interface")
-		}
-	}
 
 	if p.cfg.Service.CacheEnable {
 		cacher, err := dnscache.NewLRUCache(p.cfg.Service.CacheSize)