Add dns client

option/types.go

@@ -90,3 +90,47 @@ func (l *Listable[T]) UnmarshalJSON(content []byte) error {
 	*l = []T{singleItem}
 	return nil
 }
+
+type DomainStrategy C.DomainStrategy
+
+func (s DomainStrategy) MarshalJSON() ([]byte, error) {
+	var value string
+	switch C.DomainStrategy(s) {
+	case C.DomainStrategyAsIS:
+		value = "AsIS"
+	case C.DomainStrategyPreferIPv4:
+		value = "PreferIPv4"
+	case C.DomainStrategyPreferIPv6:
+		value = "PreferIPv6"
+	case C.DomainStrategyUseIPv4:
+		value = "UseIPv4"
+	case C.DomainStrategyUseIPv6:
+		value = "UseIPv6"
+	default:
+		return nil, E.New("unknown domain strategy: ", s)
+	}
+	return json.Marshal(value)
+}
+
+func (s *DomainStrategy) UnmarshalJSON(bytes []byte) error {
+	var value string
+	err := json.Unmarshal(bytes, &value)
+	if err != nil {
+		return err
+	}
+	switch value {
+	case "AsIS":
+		*s = DomainStrategy(C.DomainStrategyAsIS)
+	case "PreferIPv4":
+		*s = DomainStrategy(C.DomainStrategyPreferIPv4)
+	case "PreferIPv6":
+		*s = DomainStrategy(C.DomainStrategyPreferIPv6)
+	case "UseIPv4":
+		*s = DomainStrategy(C.DomainStrategyUseIPv4)
+	case "UseIPv6":
+		*s = DomainStrategy(C.DomainStrategyUseIPv6)
+	default:
+		return E.New("unknown domain strategy: ", value)
+	}
+	return nil
+}