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- // 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_WIN_H_
- #define NET_DNS_DNS_CONFIG_SERVICE_WIN_H_
- // The sole purpose of dns_config_service_win.h is for unittests so we just
- // include these headers here.
- #include <winsock2.h>
- #include <iphlpapi.h>
- #include <iptypes.h>
- #include <memory>
- #include <string>
- #include <vector>
- #include "base/memory/free_deleter.h"
- #include "base/strings/string_piece_forward.h"
- #include "net/base/net_export.h"
- #include "net/dns/dns_config_service.h"
- #include "net/dns/public/win_dns_system_settings.h"
- // The general effort of DnsConfigServiceWin is to configure |nameservers| and
- // |search| in DnsConfig. The settings are stored in the Windows registry, but
- // to simplify the task we use the IP Helper API wherever possible. That API
- // yields the complete and ordered |nameservers|, but to determine |search| we
- // need to use the registry. On Windows 7, WMI does return the correct |search|
- // but on earlier versions it is insufficient.
- //
- // Experimental evaluation of Windows behavior suggests that domain parsing is
- // naive. Domain suffixes in |search| are not validated until they are appended
- // to the resolved name. We attempt to replicate this behavior.
- namespace net {
- namespace internal {
- // Converts a UTF-16 domain name to ASCII, possibly using punycode.
- // Returns empty string on failure.
- std::string NET_EXPORT_PRIVATE ParseDomainASCII(base::WStringPiece widestr);
- // Parses |value| as search list (comma-delimited list of domain names) from
- // a registry key and stores it in |out|. Returns empty vector on failure. Empty
- // entries (e.g., "chromium.org,,org") terminate the list. Non-ascii hostnames
- // are converted to punycode.
- std::vector<std::string> NET_EXPORT_PRIVATE
- ParseSearchList(base::WStringPiece value);
- // Fills in |dns_config| from |settings|. Exposed for tests. Returns nullopt if
- // a valid config could not be determined.
- absl::optional<DnsConfig> NET_EXPORT_PRIVATE
- ConvertSettingsToDnsConfig(const WinDnsSystemSettings& settings);
- // Service for reading and watching Windows system 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().
- // Use DnsConfigService::CreateSystemService to use it outside of tests.
- class NET_EXPORT_PRIVATE DnsConfigServiceWin : public DnsConfigService {
- public:
- DnsConfigServiceWin();
- DnsConfigServiceWin(const DnsConfigServiceWin&) = delete;
- DnsConfigServiceWin& operator=(const DnsConfigServiceWin&) = delete;
- ~DnsConfigServiceWin() override;
- private:
- class Watcher;
- class ConfigReader;
- class HostsReader;
- // DnsConfigService:
- void ReadConfigNow() override;
- void ReadHostsNow() override;
- bool StartWatching() override;
- std::unique_ptr<Watcher> watcher_;
- std::unique_ptr<ConfigReader> config_reader_;
- std::unique_ptr<HostsReader> hosts_reader_;
- };
- } // namespace internal
- } // namespace net
- #endif // NET_DNS_DNS_CONFIG_SERVICE_WIN_H_
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