Generated MagicDNS search domains (only in 100.64.0.0/10)

app.go

@@ -16,6 +16,7 @@ import (
 	"gorm.io/gorm"
 	"inet.af/netaddr"
 	"tailscale.com/tailcfg"
+	"tailscale.com/types/dnstype"
 	"tailscale.com/types/wgkey"
 )
 
@@ -104,6 +105,17 @@ func NewHeadscale(cfg Config) (*Headscale, error) {
 		return nil, err
 	}
 
+	if h.cfg.DNSConfig != nil && h.cfg.DNSConfig.Proxied { // if MagicDNS
+		magicDNSDomains, err := h.generateMagicDNSRootDomains()
+		if err != nil {
+			return nil, err
+		}
+		h.cfg.DNSConfig.Routes = make(map[string][]dnstype.Resolver)
+		for _, d := range *magicDNSDomains {
+			h.cfg.DNSConfig.Routes[d.WithoutTrailingDot()] = nil
+		}
+	}
+
 	return &h, nil
 }