Add wildcard name support for predefined records

dns/router.go

@@ -263,20 +263,7 @@ func (r *Router) Exchange(ctx context.Context, message *mDNS.Msg, options adapte
 							return nil, tun.ErrDrop
 						}
 					case *R.RuleActionPredefined:
-						return &mDNS.Msg{
-							MsgHdr: mDNS.MsgHdr{
-								Id:                 message.Id,
-								Response:           true,
-								Authoritative:      true,
-								RecursionDesired:   true,
-								RecursionAvailable: true,
-								Rcode:              action.Rcode,
-							},
-							Question: message.Question,
-							Answer:   action.Answer,
-							Ns:       action.Ns,
-							Extra:    action.Extra,
-						}, nil
+						return action.Response(message), nil
 					}
 				}
 				var responseCheck func(responseAddrs []netip.Addr) bool

route/rule/rule_action.go

@@ -444,3 +444,32 @@ func (r *RuleActionPredefined) String() string {
 	options = append(options, common.Map(r.Extra, dns.RR.String)...)
 	return F.ToString("predefined(", strings.Join(options, ","), ")")
 }
+
+func (r *RuleActionPredefined) Response(request *dns.Msg) *dns.Msg {
+	return &dns.Msg{
+		MsgHdr: dns.MsgHdr{
+			Id:                 request.Id,
+			Response:           true,
+			Authoritative:      true,
+			RecursionDesired:   true,
+			RecursionAvailable: true,
+			Rcode:              r.Rcode,
+		},
+		Question: request.Question,
+		Answer:   rewriteRecords(r.Answer, request.Question[0]),
+		Ns:       rewriteRecords(r.Ns, request.Question[0]),
+		Extra:    rewriteRecords(r.Extra, request.Question[0]),
+	}
+}
+
+func rewriteRecords(records []dns.RR, question dns.Question) []dns.RR {
+	return common.Map(records, func(it dns.RR) dns.RR {
+		if strings.HasPrefix(it.Header().Name, "*") {
+			if strings.HasSuffix(question.Name, it.Header().Name[1:]) {
+				it = dns.Copy(it)
+				it.Header().Name = question.Name
+			}
+		}
+		return it
+	})
+}