1 // Copyright (c) 2010 The Chromium Authors. All rights reserved. 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_PROXY_CONFIG_SERVICE_WIN_H_ 6 #define NET_PROXY_PROXY_CONFIG_SERVICE_WIN_H_ 7 #pragma once 8 9 #include <windows.h> 10 #include <winhttp.h> 11 12 #include <vector> 13 14 #include "base/gtest_prod_util.h" 15 #include "base/win/object_watcher.h" 16 #include "net/proxy/polling_proxy_config_service.h" 17 18 namespace net { 19 20 // Implementation of ProxyConfigService that retrieves the system proxy 21 // settings. 22 // 23 // It works by calling WinHttpGetIEProxyConfigForCurrentUser() to fetch the 24 // Internet Explorer proxy settings. 25 // 26 // We use two different strategies to notice when the configuration has 27 // changed: 28 // 29 // (1) Watch the internet explorer settings registry keys for changes. When 30 // one of the registry keys pertaining to proxy settings has changed, we 31 // call WinHttpGetIEProxyConfigForCurrentUser() again to read the 32 // configuration's new value. 33 // 34 // (2) Do regular polling every 10 seconds during network activity to see if 35 // WinHttpGetIEProxyConfigForCurrentUser() returns something different. 36 // 37 // Ideally strategy (1) should be sufficient to pick up all of the changes. 38 // However we still do the regular polling as a precaution in case the 39 // implementation details of WinHttpGetIEProxyConfigForCurrentUser() ever 40 // change, or in case we got it wrong (and are not checking all possible 41 // registry dependencies). 42 class ProxyConfigServiceWin : public PollingProxyConfigService, 43 public base::win::ObjectWatcher::Delegate { 44 public: 45 ProxyConfigServiceWin(); 46 virtual ~ProxyConfigServiceWin(); 47 48 // Overrides a function from PollingProxyConfigService. 49 virtual void AddObserver(Observer* observer); 50 51 private: 52 FRIEND_TEST_ALL_PREFIXES(ProxyConfigServiceWinTest, SetFromIEConfig); 53 class KeyEntry; 54 typedef std::vector<KeyEntry*> KeyEntryList; 55 56 // Registers change observers on the registry keys relating to proxy settings. 57 void StartWatchingRegistryForChanges(); 58 59 // Creates a new KeyEntry and appends it to |keys_to_watch_|. If the key 60 // fails to be created, it is not appended to the list and we return false. 61 bool AddKeyToWatchList(HKEY rootkey, const wchar_t* subkey); 62 63 // ObjectWatcher::Delegate methods: 64 // This is called whenever one of the registry keys we are watching change. 65 virtual void OnObjectSignaled(HANDLE object); 66 67 static void GetCurrentProxyConfig(ProxyConfig* config); 68 69 // Set |config| using the proxy configuration values of |ie_config|. 70 static void SetFromIEConfig( 71 ProxyConfig* config, 72 const WINHTTP_CURRENT_USER_IE_PROXY_CONFIG& ie_config); 73 74 KeyEntryList keys_to_watch_; 75 }; 76 77 } // namespace net 78 79 #endif // NET_PROXY_PROXY_CONFIG_SERVICE_WIN_H_ 80
