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// Copyright 2018 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef NET_DNS_PUBLIC_HOST_RESOLVER_SOURCE_H_
#define NET_DNS_PUBLIC_HOST_RESOLVER_SOURCE_H_
#include <iterator>
#include "base/values.h"
#include "third_party/abseil-cpp/absl/types/optional.h"
namespace net {
// Enumeration to specify the allowed results source for HostResolver
// requests.
//
// Integer values used for (de)serialization. Do not renumber.
enum class HostResolverSource {
// Resolver will pick an appropriate source. Results could come from DNS,
// MulticastDNS, HOSTS file, etc.
ANY = 0,
// Results will only be retrieved from the system or OS, eg via the
// getaddrinfo() system call.
SYSTEM = 1,
// Results will only come from DNS queries.
DNS = 2,
// Results will only come from Multicast DNS queries.
MULTICAST_DNS = 3,
// 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. Resolves with this settings will return
// ERR_NAME_NOT_RESOLVED if an asynchronous IPv6 reachability probe needs to
// be done.
LOCAL_ONLY = 4,
MAX = LOCAL_ONLY
};
base::Value ToValue(HostResolverSource source);
// absl::nullopt if `value` is malformed for deserialization.
absl::optional<HostResolverSource> HostResolverSourceFromValue(
const base::Value& value);
const HostResolverSource kHostResolverSources[] = {
HostResolverSource::ANY, HostResolverSource::SYSTEM,
HostResolverSource::DNS, HostResolverSource::MULTICAST_DNS,
HostResolverSource::LOCAL_ONLY};
static_assert(
std::size(kHostResolverSources) ==
static_cast<unsigned>(HostResolverSource::MAX) + 1,
"All HostResolverSource values should be in kHostResolverSources.");
} // namespace net
#endif // NET_DNS_PUBLIC_HOST_RESOLVER_SOURCE_H_
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