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// 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_
#include "base/stl_util.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,
// No external sources will be used. Results will only come from fast local
// sources that are available no matter the source setting, e.g. cache, hosts
// file, IP literal resolution, etc. Resolves with this setting are guaranteed
// to finish synchronously.
LOCAL_ONLY,
MAX = LOCAL_ONLY
};
const HostResolverSource kHostResolverSources[] = {
HostResolverSource::ANY, HostResolverSource::SYSTEM,
HostResolverSource::DNS, HostResolverSource::MULTICAST_DNS,
HostResolverSource::LOCAL_ONLY};
static_assert(
base::size(kHostResolverSources) ==
static_cast<unsigned>(HostResolverSource::MAX) + 1,
"All HostResolverSource values should be in kHostResolverSources.");
} // namespace net
#endif // NET_DNS_HOST_RESOLVER_SOURCE_H_
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