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