1 // Copyright 2011 The Chromium Authors 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #ifndef NET_PROXY_RESOLUTION_WIN_PROXY_CONFIG_SERVICE_WIN_H_ 6 #define NET_PROXY_RESOLUTION_WIN_PROXY_CONFIG_SERVICE_WIN_H_ 7 8 #include <windows.h> 9 #include <winhttp.h> 10 11 #include <memory> 12 #include <vector> 13 14 #include "base/compiler_specific.h" 15 #include "base/gtest_prod_util.h" 16 #include "net/base/net_export.h" 17 #include "net/base/network_change_notifier.h" 18 #include "net/proxy_resolution/polling_proxy_config_service.h" 19 #include "net/proxy_resolution/proxy_config_with_annotation.h" 20 21 namespace base::win { 22 class RegKey; 23 } // namespace base::win 24 25 namespace net { 26 27 // Implementation of ProxyConfigService that retrieves the system proxy 28 // settings. 29 // 30 // It works by calling WinHttpGetIEProxyConfigForCurrentUser() to fetch the 31 // Internet Explorer proxy settings. 32 // 33 // We use two different strategies to notice when the configuration has 34 // changed: 35 // 36 // (1) Watch the internet explorer settings registry keys for changes. When 37 // one of the registry keys pertaining to proxy settings has changed, we 38 // call WinHttpGetIEProxyConfigForCurrentUser() again to read the 39 // configuration's new value. 40 // 41 // (2) Do regular polling every 10 seconds during network activity to see if 42 // WinHttpGetIEProxyConfigForCurrentUser() returns something different. 43 // 44 // Ideally strategy (1) should be sufficient to pick up all of the changes. 45 // However we still do the regular polling as a precaution in case the 46 // implementation details of WinHttpGetIEProxyConfigForCurrentUser() ever 47 // change, or in case we got it wrong (and are not checking all possible 48 // registry dependencies). 49 class NET_EXPORT_PRIVATE ProxyConfigServiceWin 50 : public PollingProxyConfigService, 51 public NetworkChangeNotifier::NetworkChangeObserver { 52 public: 53 ProxyConfigServiceWin(const NetworkTrafficAnnotationTag& traffic_annotation); 54 ~ProxyConfigServiceWin() override; 55 56 // Overrides a function from PollingProxyConfigService. 57 void AddObserver(Observer* observer) override; 58 59 // NetworkChangeObserver implementation. 60 void OnNetworkChanged(NetworkChangeNotifier::ConnectionType type) override; 61 62 private: 63 FRIEND_TEST_ALL_PREFIXES(ProxyConfigServiceWinTest, SetFromIEConfig); 64 65 // Registers change observers on the registry keys relating to proxy settings. 66 void StartWatchingRegistryForChanges(); 67 68 // Creates a new key and appends it to |keys_to_watch_|. If the key fails to 69 // be created, it is not appended to the list and we return false. 70 bool AddKeyToWatchList(HKEY rootkey, const wchar_t* subkey); 71 72 // This is called whenever one of the registry keys we are watching change. 73 void OnObjectSignaled(base::win::RegKey* key); 74 75 static void GetCurrentProxyConfig( 76 const NetworkTrafficAnnotationTag traffic_annotation, 77 ProxyConfigWithAnnotation* config); 78 79 // Set |config| using the proxy configuration values of |ie_config|. 80 static void SetFromIEConfig( 81 ProxyConfig* config, 82 const WINHTTP_CURRENT_USER_IE_PROXY_CONFIG& ie_config); 83 84 std::vector<std::unique_ptr<base::win::RegKey>> keys_to_watch_; 85 }; 86 87 } // namespace net 88 89 #endif // NET_PROXY_RESOLUTION_WIN_PROXY_CONFIG_SERVICE_WIN_H_ 90