| // Copyright 2018 The Chromium Authors. All rights reserved. | 
 | // Use of this source code is governed by a BSD-style license that can be | 
 | // found in the LICENSE file. | 
 |  | 
 | #ifndef NET_DNS_HOST_RESOLVER_SOURCE_H_ | 
 | #define NET_DNS_HOST_RESOLVER_SOURCE_H_ | 
 |  | 
 | namespace net { | 
 |  | 
 | // Enumeration to specify the allowed results source for HostResolver | 
 | // requests. | 
 | enum class HostResolverSource { | 
 |   // Resolver will pick an appropriate source. Results could come from DNS, | 
 |   // MulticastDNS, HOSTS file, etc. | 
 |   ANY, | 
 |  | 
 |   // Results will only be retrieved from the system or OS, eg via the | 
 |   // getaddrinfo() system call. | 
 |   SYSTEM, | 
 |  | 
 |   // Results will only come from DNS queries. | 
 |   DNS, | 
 |  | 
 |   // Results will only come from Multicast DNS queries. | 
 |   MULTICAST_DNS, | 
 | }; | 
 |  | 
 | }  // namespace net | 
 |  | 
 | #endif  // NET_DNS_HOST_RESOLVER_SOURCE_H_ |