Resolver: find local resolver instead of harcoded one

api/resolver.go

@@ -35,6 +35,7 @@ import (
 	"encoding/json"
 	"errors"
 	"io"
+	"math/rand"
 	"time"
 
 	"github.com/julienschmidt/httprouter"
@@ -63,6 +64,17 @@ func runResolver(_ *config.Options, u *happydns.User, _ httprouter.Params, body
 		}
 	}
 
+	if urr.Resolver == "Local" {
+		cConf, err := dns.ClientConfigFromFile("/etc/resolv.conf")
+		if err != nil {
+			return APIErrorResponse{
+				err: err,
+			}
+		}
+
+		urr.Resolver = cConf.Servers[rand.Intn(len(cConf.Servers))]
+	}
+
 	client := dns.Client{Timeout: time.Second * 5}
 
 	m := new(dns.Msg)

htdocs/src/views/tools-client.vue

@@ -110,9 +110,9 @@ export default {
     return {
       request_pending: false,
       existing_types: ['ANY', 'A', 'AAAA', 'NS', 'SRV', 'MX', 'TXT'],
-      existing_resolvers: ['192.168.0.254', '1.1.1.1', '8.8.8.8', '9.9.9.9'],
+      existing_resolvers: ['Local', '1.1.1.1', '8.8.8.8', '9.9.9.9'],
       form: {
-        resolver: '192.168.0.254',
+        resolver: 'Local',
         type: 'ANY'
       },
       show_responses: [],