70 lines
2.0 KiB
C
70 lines
2.0 KiB
C
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// Copyright 2012 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_DNS_CONFIG_SERVICE_POSIX_H_
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#define NET_DNS_DNS_CONFIG_SERVICE_POSIX_H_
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#include <sys/types.h>
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#include <netinet/in.h>
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#include <resolv.h>
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#include <memory>
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#include "base/compiler_specific.h"
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#include "base/gtest_prod_util.h"
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#include "net/base/net_export.h"
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#include "net/dns/dns_config_service.h"
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#include "third_party/abseil-cpp/absl/types/optional.h"
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namespace net {
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struct DnsConfig;
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// Use DnsConfigService::CreateSystemService to use it outside of tests.
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namespace internal {
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// Service for reading and watching POSIX system (except Android and Linux) DNS
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// settings.
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// This object is not thread-safe and methods may perform blocking I/O so
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// methods must be called on a sequence that allows blocking (i.e.
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// base::MayBlock). It may be constructed on a different sequence than which
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// it's later called on. WatchConfig() must be called prior to ReadConfig().
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class NET_EXPORT_PRIVATE DnsConfigServicePosix : public DnsConfigService {
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public:
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DnsConfigServicePosix();
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DnsConfigServicePosix(const DnsConfigServicePosix&) = delete;
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DnsConfigServicePosix& operator=(const DnsConfigServicePosix&) = delete;
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~DnsConfigServicePosix() override;
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void RefreshConfig() override;
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protected:
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// DnsConfigService:
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void ReadConfigNow() override;
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bool StartWatching() override;
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// Create |config_reader_|.
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void CreateReader();
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private:
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FRIEND_TEST_ALL_PREFIXES(DnsConfigServicePosixTest,
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ChangeConfigMultipleTimes);
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class Watcher;
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class ConfigReader;
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std::unique_ptr<Watcher> watcher_;
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std::unique_ptr<ConfigReader> config_reader_;
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};
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// Returns nullopt iff a valid config could not be determined.
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absl::optional<DnsConfig> NET_EXPORT_PRIVATE
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ConvertResStateToDnsConfig(const struct __res_state& res);
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} // namespace internal
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} // namespace net
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#endif // NET_DNS_DNS_CONFIG_SERVICE_POSIX_H_
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