net/proxy/proxy_config_service_win.cc

   1 // Copyright (c) 2012 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 #include "net/proxy/proxy_config_service_win.h"
   6
   7 #include <windows.h>
   8 #include <winhttp.h>
   9
  10 #include "base/bind.h"
  11 #include "base/bind_helpers.h"
  12 #include "base/logging.h"
  13 #include "base/memory/scoped_ptr.h"
  14 #include "base/stl_util.h"
  15 #include "base/strings/string_tokenizer.h"
  16 #include "base/strings/string_util.h"
  17 #include "base/strings/utf_string_conversions.h"
  18 #include "base/threading/thread_restrictions.h"
  19 #include "base/win/registry.h"
  20 #include "base/win/scoped_handle.h"
  21 #include "net/base/net_errors.h"
  22 #include "net/proxy/proxy_config.h"
  23
  24 #pragma comment(lib, "winhttp.lib")
  25
  26 namespace net {
  27
  28 namespace {
  29
  30 const int kPollIntervalSec = 10;
  31
  32 void FreeIEConfig(WINHTTP_CURRENT_USER_IE_PROXY_CONFIG* ie_config) {
  33   if (ie_config->lpszAutoConfigUrl)
  34     GlobalFree(ie_config->lpszAutoConfigUrl);
  35   if (ie_config->lpszProxy)
  36     GlobalFree(ie_config->lpszProxy);
  37   if (ie_config->lpszProxyBypass)
  38     GlobalFree(ie_config->lpszProxyBypass);
  39 }
  40
  41 }  // namespace
  42
  43 ProxyConfigServiceWin::ProxyConfigServiceWin()
  44     : PollingProxyConfigService(
  45           base::TimeDelta::FromSeconds(kPollIntervalSec),
  46           &ProxyConfigServiceWin::GetCurrentProxyConfig) {
  47 }
  48
  49 ProxyConfigServiceWin::~ProxyConfigServiceWin() {
  50   // The registry functions below will end up going to disk.  Do this on another
  51   // thread to avoid slowing the IO thread.  http://crbug.com/61453
  52   base::ThreadRestrictions::ScopedAllowIO allow_io;
  53   STLDeleteElements(&keys_to_watch_);
  54 }
  55
  56 void ProxyConfigServiceWin::AddObserver(Observer* observer) {
  57   // Lazily-initialize our registry watcher.
  58   StartWatchingRegistryForChanges();
  59
  60   // Let the super-class do its work now.
  61   PollingProxyConfigService::AddObserver(observer);
  62 }
  63
  64 void ProxyConfigServiceWin::StartWatchingRegistryForChanges() {
  65   if (!keys_to_watch_.empty())
  66     return;  // Already initialized.
  67
  68   // The registry functions below will end up going to disk.  Do this on another
  69   // thread to avoid slowing the IO thread.  http://crbug.com/61453
  70   base::ThreadRestrictions::ScopedAllowIO allow_io;
  71
  72   // There are a number of different places where proxy settings can live
  73   // in the registry. In some cases it appears in a binary value, in other
  74   // cases string values. Furthermore winhttp and wininet appear to have
  75   // separate stores, and proxy settings can be configured per-machine
  76   // or per-user.
  77   //
  78   // This function is probably not exhaustive in the registry locations it
  79   // watches for changes, however it should catch the majority of the
  80   // cases. In case we have missed some less common triggers (likely), we
  81   // will catch them during the periodic (10 second) polling, so things
  82   // will recover.
  83
  84   AddKeyToWatchList(
  85       HKEY_CURRENT_USER,
  86       L"Software\\Microsoft\\Windows\\CurrentVersion\\Internet Settings");
  87
  88   AddKeyToWatchList(
  89       HKEY_LOCAL_MACHINE,
  90       L"Software\\Microsoft\\Windows\\CurrentVersion\\Internet Settings");
  91
  92   AddKeyToWatchList(
  93       HKEY_LOCAL_MACHINE,
  94       L"SOFTWARE\\Policies\\Microsoft\\Windows\\CurrentVersion\\"
  95       L"Internet Settings");
  96 }
  97
  98 bool ProxyConfigServiceWin::AddKeyToWatchList(HKEY rootkey,
  99                                               const wchar_t* subkey) {
 100   scoped_ptr<base::win::RegKey> key(new base::win::RegKey);
 101   if (key->Create(rootkey, subkey, KEY_NOTIFY) != ERROR_SUCCESS)
 102     return false;
 103
 104   if (!key->StartWatching(base::Bind(&ProxyConfigServiceWin::OnObjectSignaled,
 105                                      base::Unretained(this),
 106                                      base::Unretained(key.get())))) {
 107     return false;
 108   }
 109
 110   keys_to_watch_.push_back(key.release());
 111   return true;
 112 }
 113
 114 void ProxyConfigServiceWin::OnObjectSignaled(base::win::RegKey* key) {
 115   // Figure out which registry key signalled this change.
 116   RegKeyList::iterator it =
 117       std::find(keys_to_watch_.begin(), keys_to_watch_.end(), key);
 118   DCHECK(it != keys_to_watch_.end());
 119
 120   // Keep watching the registry key.
 121   if (!key->StartWatching(base::Bind(&ProxyConfigServiceWin::OnObjectSignaled,
 122                                      base::Unretained(this),
 123                                      base::Unretained(key)))) {
 124     delete *it;
 125     keys_to_watch_.erase(it);
 126   }
 127
 128   // Have the PollingProxyConfigService test for changes.
 129   CheckForChangesNow();
 130 }
 131
 132 // static
 133 void ProxyConfigServiceWin::GetCurrentProxyConfig(ProxyConfig* config) {
 134   WINHTTP_CURRENT_USER_IE_PROXY_CONFIG ie_config = {0};
 135   if (!WinHttpGetIEProxyConfigForCurrentUser(&ie_config)) {
 136     LOG(ERROR) << "WinHttpGetIEProxyConfigForCurrentUser failed: " <<
 137         GetLastError();
 138     *config = ProxyConfig::CreateDirect();
 139     config->set_source(PROXY_CONFIG_SOURCE_SYSTEM_FAILED);
 140     return;
 141   }
 142   SetFromIEConfig(config, ie_config);
 143   FreeIEConfig(&ie_config);
 144 }
 145
 146 // static
 147 void ProxyConfigServiceWin::SetFromIEConfig(
 148     ProxyConfig* config,
 149     const WINHTTP_CURRENT_USER_IE_PROXY_CONFIG& ie_config) {
 150   if (ie_config.fAutoDetect)
 151     config->set_auto_detect(true);
 152   if (ie_config.lpszProxy) {
 153     // lpszProxy may be a single proxy, or a proxy per scheme. The format
 154     // is compatible with ProxyConfig::ProxyRules's string format.
 155     config->proxy_rules().ParseFromString(
 156         base::UTF16ToASCII(ie_config.lpszProxy));
 157   }
 158   if (ie_config.lpszProxyBypass) {
 159     std::string proxy_bypass = base::UTF16ToASCII(ie_config.lpszProxyBypass);
 160
 161     base::StringTokenizer proxy_server_bypass_list(proxy_bypass, ";, \t\n\r");
 162     while (proxy_server_bypass_list.GetNext()) {
 163       std::string bypass_url_domain = proxy_server_bypass_list.token();
 164       config->proxy_rules().bypass_rules.AddRuleFromString(bypass_url_domain);
 165     }
 166   }
 167   if (ie_config.lpszAutoConfigUrl)
 168     config->set_pac_url(GURL(ie_config.lpszAutoConfigUrl));
 169   config->set_source(PROXY_CONFIG_SOURCE_SYSTEM);
 170 }
 171
 172 }  // namespace net