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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.
#include "net/proxy/proxy_config_service_win.h"
#include <windows.h>
#include <winhttp.h>
#include "base/logging.h"
#include "base/memory/scoped_ptr.h"
#include "base/stl_util.h"
#include "base/strings/string_util.h"
#include "base/strings/string_tokenizer.h"
#include "base/threading/thread_restrictions.h"
#include "base/win/registry.h"
#include "net/base/net_errors.h"
#include "net/proxy/proxy_config.h"
#pragma comment(lib, "winhttp.lib")
namespace net {
namespace {
const int kPollIntervalSec = 10;
void FreeIEConfig(WINHTTP_CURRENT_USER_IE_PROXY_CONFIG* ie_config) {
if (ie_config->lpszAutoConfigUrl)
GlobalFree(ie_config->lpszAutoConfigUrl);
if (ie_config->lpszProxy)
GlobalFree(ie_config->lpszProxy);
if (ie_config->lpszProxyBypass)
GlobalFree(ie_config->lpszProxyBypass);
}
} // namespace
// RegKey and ObjectWatcher pair.
class ProxyConfigServiceWin::KeyEntry {
public:
bool StartWatching(base::win::ObjectWatcher::Delegate* delegate) {
// Try to create a watch event for the registry key (which watches the
// sibling tree as well).
if (key_.StartWatching() != ERROR_SUCCESS)
return false;
// Now setup an ObjectWatcher for this event, so we get OnObjectSignaled()
// invoked on this message loop once it is signalled.
if (!watcher_.StartWatching(key_.watch_event(), delegate))
return false;
return true;
}
bool CreateRegKey(HKEY rootkey, const wchar_t* subkey) {
return key_.Create(rootkey, subkey, KEY_NOTIFY) == ERROR_SUCCESS;
}
HANDLE watch_event() const {
return key_.watch_event();
}
private:
base::win::RegKey key_;
base::win::ObjectWatcher watcher_;
};
ProxyConfigServiceWin::ProxyConfigServiceWin()
: PollingProxyConfigService(
base::TimeDelta::FromSeconds(kPollIntervalSec),
&ProxyConfigServiceWin::GetCurrentProxyConfig) {
}
ProxyConfigServiceWin::~ProxyConfigServiceWin() {
// The registry functions below will end up going to disk. Do this on another
// thread to avoid slowing the IO thread. http://crbug.com/61453
base::ThreadRestrictions::ScopedAllowIO allow_io;
STLDeleteElements(&keys_to_watch_);
}
void ProxyConfigServiceWin::AddObserver(Observer* observer) {
// Lazily-initialize our registry watcher.
StartWatchingRegistryForChanges();
// Let the super-class do its work now.
PollingProxyConfigService::AddObserver(observer);
}
void ProxyConfigServiceWin::StartWatchingRegistryForChanges() {
if (!keys_to_watch_.empty())
return; // Already initialized.
// The registry functions below will end up going to disk. Do this on another
// thread to avoid slowing the IO thread. http://crbug.com/61453
base::ThreadRestrictions::ScopedAllowIO allow_io;
// There are a number of different places where proxy settings can live
// in the registry. In some cases it appears in a binary value, in other
// cases string values. Furthermore winhttp and wininet appear to have
// separate stores, and proxy settings can be configured per-machine
// or per-user.
//
// This function is probably not exhaustive in the registry locations it
// watches for changes, however it should catch the majority of the
// cases. In case we have missed some less common triggers (likely), we
// will catch them during the periodic (10 second) polling, so things
// will recover.
AddKeyToWatchList(
HKEY_CURRENT_USER,
L"Software\\Microsoft\\Windows\\CurrentVersion\\Internet Settings");
AddKeyToWatchList(
HKEY_LOCAL_MACHINE,
L"Software\\Microsoft\\Windows\\CurrentVersion\\Internet Settings");
AddKeyToWatchList(
HKEY_LOCAL_MACHINE,
L"SOFTWARE\\Policies\\Microsoft\\Windows\\CurrentVersion\\"
L"Internet Settings");
}
bool ProxyConfigServiceWin::AddKeyToWatchList(HKEY rootkey,
const wchar_t* subkey) {
scoped_ptr<KeyEntry> entry(new KeyEntry);
if (!entry->CreateRegKey(rootkey, subkey))
return false;
if (!entry->StartWatching(this))
return false;
keys_to_watch_.push_back(entry.release());
return true;
}
void ProxyConfigServiceWin::OnObjectSignaled(HANDLE object) {
// Figure out which registry key signalled this change.
KeyEntryList::iterator it;
for (it = keys_to_watch_.begin(); it != keys_to_watch_.end(); ++it) {
if ((*it)->watch_event() == object)
break;
}
DCHECK(it != keys_to_watch_.end());
// Keep watching the registry key.
if (!(*it)->StartWatching(this))
keys_to_watch_.erase(it);
// Have the PollingProxyConfigService test for changes.
CheckForChangesNow();
}
// static
void ProxyConfigServiceWin::GetCurrentProxyConfig(ProxyConfig* config) {
WINHTTP_CURRENT_USER_IE_PROXY_CONFIG ie_config = {0};
if (!WinHttpGetIEProxyConfigForCurrentUser(&ie_config)) {
LOG(ERROR) << "WinHttpGetIEProxyConfigForCurrentUser failed: " <<
GetLastError();
*config = ProxyConfig::CreateDirect();
config->set_source(PROXY_CONFIG_SOURCE_SYSTEM_FAILED);
return;
}
SetFromIEConfig(config, ie_config);
FreeIEConfig(&ie_config);
}
// static
void ProxyConfigServiceWin::SetFromIEConfig(
ProxyConfig* config,
const WINHTTP_CURRENT_USER_IE_PROXY_CONFIG& ie_config) {
if (ie_config.fAutoDetect)
config->set_auto_detect(true);
if (ie_config.lpszProxy) {
// lpszProxy may be a single proxy, or a proxy per scheme. The format
// is compatible with ProxyConfig::ProxyRules's string format.
config->proxy_rules().ParseFromString(WideToASCII(ie_config.lpszProxy));
}
if (ie_config.lpszProxyBypass) {
std::string proxy_bypass = WideToASCII(ie_config.lpszProxyBypass);
base::StringTokenizer proxy_server_bypass_list(proxy_bypass, ";, \t\n\r");
while (proxy_server_bypass_list.GetNext()) {
std::string bypass_url_domain = proxy_server_bypass_list.token();
config->proxy_rules().bypass_rules.AddRuleFromString(bypass_url_domain);
}
}
if (ie_config.lpszAutoConfigUrl)
config->set_pac_url(GURL(ie_config.lpszAutoConfigUrl));
config->set_source(PROXY_CONFIG_SOURCE_SYSTEM);
}
} // namespace net
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