53 lines
1.6 KiB
C++
53 lines
1.6 KiB
C++
// Copyright 2018 The Chromium Authors
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef NET_DNS_PUBLIC_HOST_RESOLVER_SOURCE_H_
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#define NET_DNS_PUBLIC_HOST_RESOLVER_SOURCE_H_
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#include <iterator>
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namespace net {
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// Enumeration to specify the allowed results source for HostResolver
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// requests.
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enum class HostResolverSource {
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// Resolver will pick an appropriate source. Results could come from DNS,
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// MulticastDNS, HOSTS file, etc.
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ANY,
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// Results will only be retrieved from the system or OS, eg via the
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// getaddrinfo() system call.
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SYSTEM,
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// Results will only come from DNS queries.
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DNS,
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// Results will only come from Multicast DNS queries.
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MULTICAST_DNS,
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// No external sources will be used. Results will only come from fast local
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// sources that are available no matter the source setting, e.g. cache, hosts
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// file, IP literal resolution, etc. Resolves with this setting are guaranteed
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// to finish synchronously. Resolves with this settings will return
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// ERR_NAME_NOT_RESOLVED if an asynchronous IPv6 reachability probe needs to
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// be done.
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LOCAL_ONLY,
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MAX = LOCAL_ONLY
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};
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const HostResolverSource kHostResolverSources[] = {
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HostResolverSource::ANY, HostResolverSource::SYSTEM,
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HostResolverSource::DNS, HostResolverSource::MULTICAST_DNS,
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HostResolverSource::LOCAL_ONLY};
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static_assert(
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std::size(kHostResolverSources) ==
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static_cast<unsigned>(HostResolverSource::MAX) + 1,
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"All HostResolverSource values should be in kHostResolverSources.");
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} // namespace net
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#endif // NET_DNS_PUBLIC_HOST_RESOLVER_SOURCE_H_
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