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84 lines
2.8 KiB
C++
84 lines
2.8 KiB
C++
// Copyright (c) 2011 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef NET_PROXY_PROXY_CONFIG_SERVICE_WIN_H_
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#define NET_PROXY_PROXY_CONFIG_SERVICE_WIN_H_
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#include <windows.h>
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#include <winhttp.h>
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#include <memory>
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#include <vector>
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#include "base/compiler_specific.h"
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#include "base/gtest_prod_util.h"
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#include "net/base/net_export.h"
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#include "net/proxy/polling_proxy_config_service.h"
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namespace base {
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namespace win {
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class RegKey;
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}
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} // namespace base.
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namespace net {
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// Implementation of ProxyConfigService that retrieves the system proxy
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// settings.
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//
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// It works by calling WinHttpGetIEProxyConfigForCurrentUser() to fetch the
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// Internet Explorer proxy settings.
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//
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// We use two different strategies to notice when the configuration has
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// changed:
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//
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// (1) Watch the internet explorer settings registry keys for changes. When
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// one of the registry keys pertaining to proxy settings has changed, we
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// call WinHttpGetIEProxyConfigForCurrentUser() again to read the
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// configuration's new value.
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//
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// (2) Do regular polling every 10 seconds during network activity to see if
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// WinHttpGetIEProxyConfigForCurrentUser() returns something different.
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//
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// Ideally strategy (1) should be sufficient to pick up all of the changes.
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// However we still do the regular polling as a precaution in case the
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// implementation details of WinHttpGetIEProxyConfigForCurrentUser() ever
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// change, or in case we got it wrong (and are not checking all possible
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// registry dependencies).
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class NET_EXPORT_PRIVATE ProxyConfigServiceWin
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: public PollingProxyConfigService {
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public:
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ProxyConfigServiceWin();
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~ProxyConfigServiceWin() override;
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// Overrides a function from PollingProxyConfigService.
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void AddObserver(Observer* observer) override;
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private:
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FRIEND_TEST_ALL_PREFIXES(ProxyConfigServiceWinTest, SetFromIEConfig);
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// Registers change observers on the registry keys relating to proxy settings.
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void StartWatchingRegistryForChanges();
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// Creates a new key and appends it to |keys_to_watch_|. If the key fails to
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// be created, it is not appended to the list and we return false.
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bool AddKeyToWatchList(HKEY rootkey, const wchar_t* subkey);
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// This is called whenever one of the registry keys we are watching change.
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void OnObjectSignaled(base::win::RegKey* key);
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static void GetCurrentProxyConfig(ProxyConfig* config);
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// Set |config| using the proxy configuration values of |ie_config|.
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static void SetFromIEConfig(
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ProxyConfig* config,
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const WINHTTP_CURRENT_USER_IE_PROXY_CONFIG& ie_config);
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std::vector<std::unique_ptr<base::win::RegKey>> keys_to_watch_;
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};
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} // namespace net
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#endif // NET_PROXY_PROXY_CONFIG_SERVICE_WIN_H_
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