Send search domains

api.go

@@ -241,11 +241,27 @@ func (h *Headscale) getMapResponse(mKey wgkey.Key, req tailcfg.MapRequest, m Mac
 		DisplayName: m.Namespace.Name,
 	}
 
+	var dnsConfig *tailcfg.DNSConfig
+	if h.cfg.DNSConfig.Proxied { // if MagicDNS is enabled
+		// TODO(juanfont): We should not be regenerating this all the time
+		// And we should only send the domains of the peers (this own namespace + those from the shared peers)
+		namespaces, err := h.ListNamespaces()
+		if err != nil {
+			return nil, err
+		}
+		dnsConfig := h.cfg.DNSConfig.Clone()
+		for _, ns := range *namespaces {
+			dnsConfig.Domains = append(dnsConfig.Domains, fmt.Sprintf("%s.%s", ns.Name, h.cfg.BaseDomain))
+		}
+	} else {
+		dnsConfig = h.cfg.DNSConfig
+	}
+
 	resp := tailcfg.MapResponse{
 		KeepAlive:    false,
 		Node:         node,
 		Peers:        *peers,
-		DNSConfig:    h.cfg.DNSConfig,
+		DNSConfig:    dnsConfig,
 		Domain:       h.cfg.BaseDomain,
 		PacketFilter: *h.aclRules,
 		DERPMap:      h.cfg.DerpMap,