1// Copyright (c) 2011 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 8#include <windows.h> 9#include <winhttp.h> 10 11#include <vector> 12 13#include "base/compiler_specific.h" 14#include "base/gtest_prod_util.h" 15#include "base/win/object_watcher.h" 16#include "net/proxy/polling_proxy_config_service.h" 17 18namespace 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). 42class NET_EXPORT_PRIVATE ProxyConfigServiceWin 43 : public PollingProxyConfigService, 44 public base::win::ObjectWatcher::Delegate { 45 public: 46 ProxyConfigServiceWin(); 47 virtual ~ProxyConfigServiceWin(); 48 49 // Overrides a function from PollingProxyConfigService. 50 virtual void AddObserver(Observer* observer) OVERRIDE; 51 52 private: 53 FRIEND_TEST_ALL_PREFIXES(ProxyConfigServiceWinTest, SetFromIEConfig); 54 class KeyEntry; 55 typedef std::vector<KeyEntry*> KeyEntryList; 56 57 // Registers change observers on the registry keys relating to proxy settings. 58 void StartWatchingRegistryForChanges(); 59 60 // Creates a new KeyEntry and appends it to |keys_to_watch_|. If the key 61 // fails to be created, it is not appended to the list and we return false. 62 bool AddKeyToWatchList(HKEY rootkey, const wchar_t* subkey); 63 64 // ObjectWatcher::Delegate methods: 65 // This is called whenever one of the registry keys we are watching change. 66 virtual void OnObjectSignaled(HANDLE object) OVERRIDE; 67 68 static void GetCurrentProxyConfig(ProxyConfig* config); 69 70 // Set |config| using the proxy configuration values of |ie_config|. 71 static void SetFromIEConfig( 72 ProxyConfig* config, 73 const WINHTTP_CURRENT_USER_IE_PROXY_CONFIG& ie_config); 74 75 KeyEntryList keys_to_watch_; 76}; 77 78} // namespace net 79 80#endif // NET_PROXY_PROXY_CONFIG_SERVICE_WIN_H_ 81