src/components/wifi/wifi_service_win.cc

   1 // Copyright 2013 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 "components/wifi/wifi_service.h"
   6
   7 #include <iphlpapi.h>
   8 #include <objbase.h>
   9 #include <wlanapi.h>
  10
  11 #include <set>
  12
  13 #include "base/base_paths_win.h"
  14 #include "base/bind.h"
  15 #include "base/files/file_path.h"
  16 #include "base/memory/ref_counted.h"
  17 #include "base/message_loop/message_loop.h"
  18 #include "base/path_service.h"
  19 #include "base/strings/string16.h"
  20 #include "base/strings/string_util.h"
  21 #include "base/strings/utf_string_conversions.h"
  22 #include "base/win/registry.h"
  23 #include "components/onc/onc_constants.h"
  24 #include "third_party/libxml/chromium/libxml_utils.h"
  25
  26 namespace {
  27 const char kWiFiServiceError[] = "Error.WiFiService";
  28 const char kWiFiServiceErrorNotImplemented[] =
  29     "Error.WiFiService.NotImplemented";
  30 const wchar_t kNwCategoryWizardRegKey[] =
  31     L"Software\\Microsoft\\Windows NT\\CurrentVersion\\Network\\"
  32     L"NwCategoryWizard";
  33 const wchar_t kNwCategoryWizardRegValue[] = L"Show";
  34 const wchar_t kNwCategoryWizardSavedRegValue[] = L"ShowSaved";
  35 const wchar_t kNwCategoryWizardDeleteRegValue[] = L"ShowDelete";
  36 const wchar_t kWlanApiDll[] = L"wlanapi.dll";
  37
  38 // WlanApi function names
  39 const char kWlanConnect[] = "WlanConnect";
  40 const char kWlanCloseHandle[] = "WlanCloseHandle";
  41 const char kWlanDisconnect[] = "WlanDisconnect";
  42 const char kWlanEnumInterfaces[] = "WlanEnumInterfaces";
  43 const char kWlanFreeMemory[] = "WlanFreeMemory";
  44 const char kWlanGetAvailableNetworkList[] = "WlanGetAvailableNetworkList";
  45 const char kWlanGetNetworkBssList[] = "WlanGetNetworkBssList";
  46 const char kWlanGetProfile[] = "WlanGetProfile";
  47 const char kWlanOpenHandle[] = "WlanOpenHandle";
  48 const char kWlanQueryInterface[] = "WlanQueryInterface";
  49 const char kWlanRegisterNotification[] = "WlanRegisterNotification";
  50 const char kWlanSaveTemporaryProfile[] = "WlanSaveTemporaryProfile";
  51 const char kWlanScan[] = "WlanScan";
  52 const char kWlanSetProfile[] = "WlanSetProfile";
  53
  54 // WlanApi function definitions
  55 typedef DWORD (WINAPI* WlanConnectFunction)(
  56     HANDLE hClientHandle,
  57     CONST GUID *pInterfaceGuid,
  58     CONST PWLAN_CONNECTION_PARAMETERS pConnectionParameters,
  59     PVOID pReserved);
  60
  61 typedef DWORD (WINAPI* WlanCloseHandleFunction)(
  62     HANDLE hClientHandle,
  63     PVOID pReserved);
  64
  65 typedef DWORD (WINAPI* WlanDisconnectFunction)(
  66     HANDLE hClientHandle,
  67     CONST GUID *pInterfaceGuid,
  68     PVOID pReserved);
  69
  70 typedef DWORD (WINAPI* WlanEnumInterfacesFunction)(
  71     HANDLE hClientHandle,
  72     PVOID pReserved,
  73     PWLAN_INTERFACE_INFO_LIST *ppInterfaceList);
  74
  75 typedef VOID (WINAPI* WlanFreeMemoryFunction)(
  76     _In_ PVOID pMemory);
  77
  78 typedef DWORD (WINAPI* WlanGetAvailableNetworkListFunction)(
  79     HANDLE hClientHandle,
  80     CONST GUID *pInterfaceGuid,
  81     DWORD dwFlags,
  82     PVOID pReserved,
  83     PWLAN_AVAILABLE_NETWORK_LIST *ppAvailableNetworkList);
  84
  85 typedef DWORD (WINAPI* WlanGetNetworkBssListFunction)(
  86     HANDLE hClientHandle,
  87     const GUID* pInterfaceGuid,
  88     const  PDOT11_SSID pDot11Ssid,
  89     DOT11_BSS_TYPE dot11BssType,
  90     BOOL bSecurityEnabled,
  91     PVOID pReserved,
  92     PWLAN_BSS_LIST* ppWlanBssList);
  93
  94 typedef DWORD (WINAPI* WlanGetProfileFunction)(
  95     HANDLE hClientHandle,
  96     CONST GUID *pInterfaceGuid,
  97     LPCWSTR strProfileName,
  98     PVOID pReserved,
  99     LPWSTR *pstrProfileXml,
 100     DWORD *pdwFlags,
 101     DWORD *pdwGrantedAccess);
 102
 103 typedef DWORD (WINAPI* WlanOpenHandleFunction)(
 104     DWORD dwClientVersion,
 105     PVOID pReserved,
 106     PDWORD pdwNegotiatedVersion,
 107     PHANDLE phClientHandle);
 108
 109 typedef DWORD (WINAPI* WlanQueryInterfaceFunction)(
 110     HANDLE hClientHandle,
 111     const GUID *pInterfaceGuid,
 112     WLAN_INTF_OPCODE OpCode,
 113     PVOID pReserved,
 114     PDWORD pdwDataSize,
 115     PVOID *ppData,
 116     PWLAN_OPCODE_VALUE_TYPE pWlanOpcodeValueType);
 117
 118 typedef DWORD (WINAPI* WlanRegisterNotificationFunction)(
 119     HANDLE hClientHandle,
 120     DWORD dwNotifSource,
 121     BOOL bIgnoreDuplicate,
 122     WLAN_NOTIFICATION_CALLBACK funcCallback,
 123     PVOID pCallbackContext,
 124     PVOID pReserved,
 125     PDWORD pdwPrevNotifSource);
 126
 127 typedef DWORD (WINAPI* WlanSaveTemporaryProfileFunction)(
 128     HANDLE hClientHandle,
 129     CONST GUID* pInterfaceGuid,
 130     LPCWSTR strProfileName,
 131     LPCWSTR strAllUserProfileSecurity,
 132     DWORD dwFlags,
 133     BOOL bOverWrite,
 134     PVOID pReserved);
 135
 136 typedef DWORD (WINAPI* WlanScanFunction)(
 137     HANDLE hClientHandle,
 138     CONST GUID *pInterfaceGuid,
 139     CONST PDOT11_SSID pDot11Ssid,
 140     CONST PWLAN_RAW_DATA pIeData,
 141     PVOID pReserved);
 142
 143 typedef DWORD (WINAPI* WlanSetProfileFunction)(
 144     HANDLE hClientHandle,
 145     const GUID *pInterfaceGuid,
 146     DWORD dwFlags,
 147     LPCWSTR strProfileXml,
 148     LPCWSTR strAllUserProfileSecurity,
 149     BOOL bOverwrite,
 150     PVOID pReserved,
 151     DWORD* pdwReasonCode);
 152
 153 // Values for WLANProfile XML.
 154 const char kAuthenticationOpen[] = "open";
 155 const char kAuthenticationWepPsk[] = "WEP";
 156 const char kAuthenticationWpaPsk[] = "WPAPSK";
 157 const char kAuthenticationWpa2Psk[] = "WPA2PSK";
 158 const char kEncryptionAES[] = "AES";
 159 const char kEncryptionNone[] = "none";
 160 const char kEncryptionTKIP[] = "TKIP";
 161 const char kEncryptionWEP[] = "WEP";
 162 const char kKeyTypeNetwork[] = "networkKey";
 163 const char kKeyTypePassphrase[] = "passPhrase";
 164
 165 }  // namespace
 166
 167 namespace wifi {
 168
 169 // Implementation of WiFiService for Windows.
 170 class WiFiServiceImpl : public WiFiService {
 171  public:
 172   WiFiServiceImpl();
 173   virtual ~WiFiServiceImpl();
 174
 175   // WiFiService interface implementation.
 176   virtual void Initialize(
 177       scoped_refptr<base::SequencedTaskRunner> task_runner) OVERRIDE;
 178
 179   virtual void UnInitialize() OVERRIDE;
 180
 181   virtual void GetProperties(const std::string& network_guid,
 182                              base::DictionaryValue* properties,
 183                              std::string* error) OVERRIDE;
 184
 185   virtual void GetManagedProperties(const std::string& network_guid,
 186                                     base::DictionaryValue* managed_properties,
 187                                     std::string* error) OVERRIDE;
 188
 189   virtual void GetState(const std::string& network_guid,
 190                         base::DictionaryValue* properties,
 191                         std::string* error) OVERRIDE;
 192
 193   virtual void SetProperties(const std::string& network_guid,
 194                              scoped_ptr<base::DictionaryValue> properties,
 195                              std::string* error) OVERRIDE;
 196
 197   virtual void CreateNetwork(bool shared,
 198                              scoped_ptr<base::DictionaryValue> properties,
 199                              std::string* network_guid,
 200                              std::string* error) OVERRIDE;
 201
 202   virtual void GetVisibleNetworks(const std::string& network_type,
 203                                    base::ListValue* network_list) OVERRIDE;
 204
 205   virtual void RequestNetworkScan() OVERRIDE;
 206
 207   virtual void StartConnect(const std::string& network_guid,
 208                             std::string* error) OVERRIDE;
 209
 210   virtual void StartDisconnect(const std::string& network_guid,
 211                                std::string* error) OVERRIDE;
 212
 213   virtual void GetKeyFromSystem(const std::string& network_guid,
 214                                 std::string* key_data,
 215                                 std::string* error) OVERRIDE;
 216
 217   virtual void SetEventObservers(
 218       scoped_refptr<base::MessageLoopProxy> message_loop_proxy,
 219       const NetworkGuidListCallback& networks_changed_observer,
 220       const NetworkGuidListCallback& network_list_changed_observer) OVERRIDE;
 221
 222   virtual void RequestConnectedNetworkUpdate() OVERRIDE {}
 223
 224  private:
 225   // Static callback for Windows WLAN_NOTIFICATION. Calls OnWlanNotification
 226   // on WiFiServiceImpl passed back as |context|.
 227   static void __stdcall OnWlanNotificationCallback(
 228       PWLAN_NOTIFICATION_DATA wlan_notification_data,
 229       PVOID context);
 230
 231   // Callback for Windows WLAN_NOTIFICATION. Called on random thread from
 232   // OnWlanNotificationCallback. Handles network connectivity and scan complete
 233   // notification and posts tasks to main thread.
 234   void OnWlanNotification(PWLAN_NOTIFICATION_DATA wlan_notification_data);
 235
 236   // Handles NetworkScanComplete notification on main thread. Sends
 237   // |NetworkListChanged| event with new list of visible networks.
 238   void OnNetworkScanCompleteOnMainThread();
 239
 240   // Wait up to |kMaxAttempts| with |kAttemptDelayMs| delay for connection
 241   // to network with |network_guid|. Reset DHCP and Notify that |NetworkChanged|
 242   // upon success.
 243   void WaitForNetworkConnect(const std::string& network_guid, int attempt);
 244
 245   // Check |error_code| and if is not |ERROR_SUCCESS|, then store |error_name|
 246   // into |error|.
 247   bool CheckError(DWORD error_code,
 248                   const std::string& error_name,
 249                   std::string* error) const;
 250
 251   // Return |iterator| to network identified by |network_guid| in |networks|
 252   // list.
 253   NetworkList::iterator FindNetwork(NetworkList& networks,
 254                                     const std::string& network_guid);
 255
 256   // Save currently connected network profile and return its
 257   // |connected_network_guid|, so it can be re-connected later.
 258   DWORD SaveCurrentConnectedNetwork(std::string* connected_network_guid);
 259
 260   // Sort networks, so connected/connecting is up front, then by type:
 261   // Ethernet, WiFi, Cellular, VPN
 262   static void SortNetworks(NetworkList* networks);
 263
 264   // Open a WLAN client handle, register for WLAN notifications.
 265   DWORD OpenClientHandle();
 266
 267   // Reset DHCP on wireless network to work around an issue when Windows
 268   // takes forever to connect to the network, e.g. after Chromecast
 269   // device reset.
 270   DWORD ResetDHCP();
 271
 272   // Find |adapter_index_map| by |interface_guid| for DHCP reset.
 273   DWORD FindAdapterIndexMapByGUID(const GUID& interface_guid,
 274                                   IP_ADAPTER_INDEX_MAP* adapter_index_map);
 275
 276   // Avoid the network location wizard to pop up when network is connected.
 277   // Preserve current value in |saved_nw_category_wizard_|.
 278   DWORD DisableNwCategoryWizard();
 279
 280   // Restore network location wizard to value saved by DisableNwCategoryWizard.
 281   DWORD RestoreNwCategoryWizard();
 282
 283   // Ensure that |client_| handle is initialized.
 284   DWORD EnsureInitialized();
 285
 286   // Close |client_| handle if it is open.
 287   DWORD CloseClientHandle();
 288
 289   // Get |profile_name| from unique |network_guid|.
 290   base::string16 ProfileNameFromGUID(const std::string& network_guid) const {
 291     return base::UTF8ToUTF16(network_guid);
 292   }
 293
 294   // Get |dot11_ssid| from unique |network_guid|.
 295   DOT11_SSID SSIDFromGUID(const std::string& network_guid) const;
 296
 297   // Get unique |network_guid| string based on |dot11_ssid|.
 298   std::string GUIDFromSSID(const DOT11_SSID& dot11_ssid) const {
 299     return std::string(reinterpret_cast<const char*>(dot11_ssid.ucSSID),
 300                        dot11_ssid.uSSIDLength);
 301   }
 302
 303   // Get network |ssid| string based on |wlan|.
 304   std::string SSIDFromWLAN(const WLAN_AVAILABLE_NETWORK& wlan) const {
 305     return GUIDFromSSID(wlan.dot11Ssid);
 306   }
 307
 308   // Get unique |network_guid| string based on |wlan|.
 309   std::string GUIDFromWLAN(const WLAN_AVAILABLE_NETWORK& wlan) const {
 310     return SSIDFromWLAN(wlan);
 311   }
 312
 313   // Deduce |onc::wifi| security from |alg|.
 314   std::string SecurityFromDot11AuthAlg(DOT11_AUTH_ALGORITHM alg) const;
 315
 316   // Deduce WLANProfile |authEncryption| values from |onc::wifi| security.
 317   bool AuthEncryptionFromSecurity(const std::string& security,
 318                                   std::string* authentication,
 319                                   std::string* encryption,
 320                                   std::string* key_type) const;
 321
 322   // Populate |properties| based on |wlan| and its corresponding bss info from
 323   // |wlan_bss_list|.
 324   void NetworkPropertiesFromAvailableNetwork(const WLAN_AVAILABLE_NETWORK& wlan,
 325                                              const WLAN_BSS_LIST& wlan_bss_list,
 326                                              NetworkProperties* properties);
 327
 328   // Get the list of visible wireless networks.
 329   DWORD GetVisibleNetworkList(NetworkList* network_list);
 330
 331   // Find currently connected network if any. Populate |connected_network_guid|
 332   // on success.
 333   DWORD FindConnectedNetwork(std::string* connected_network_guid);
 334
 335   // Connect to network |network_guid| using previosly stored profile if exists,
 336   // or just network sid. If |frequency| is not |kFrequencyUnknown| then
 337   // connects only to BSS which uses that frequency and returns
 338   // |ERROR_NOT_FOUND| if such BSS cannot be found.
 339   DWORD Connect(const std::string& network_guid, Frequency frequency);
 340
 341   // Disconnect from currently connected network if any.
 342   DWORD Disconnect();
 343
 344   // Get Frequency of currently connected network |network_guid|. If network is
 345   // not connected, then return |kFrequencyUnknown|.
 346   Frequency GetConnectedFrequency(const std::string& network_guid);
 347
 348   // Get desired connection freqency if it was set using |SetProperties|.
 349   // Default to |kFrequencyAny|.
 350   Frequency GetFrequencyToConnect(const std::string& network_guid) const;
 351
 352   // Get DOT11_BSSID_LIST of desired BSSIDs to connect to |ssid| network on
 353   // given |frequency|.
 354   DWORD GetDesiredBssList(DOT11_SSID& ssid,
 355                           Frequency frequency,
 356                           scoped_ptr<DOT11_BSSID_LIST>* desired_list);
 357
 358   // Normalizes |frequency_in_mhz| into one of |Frequency| values.
 359   Frequency GetNormalizedFrequency(int frequency_in_mhz) const;
 360
 361   // Create |profile_xml| based on |network_properties|.
 362   bool CreateProfile(const NetworkProperties& network_properties,
 363                      std::string* profile_xml);
 364
 365   // Save temporary wireless profile for |network_guid|.
 366   DWORD SaveTempProfile(const std::string& network_guid);
 367
 368   // Get previously stored |profile_xml| for |network_guid|.
 369   // If |get_plaintext_key| is true, and process has sufficient privileges, then
 370   // <sharedKey> data in |profile_xml| will be unprotected.
 371   DWORD GetProfile(const std::string& network_guid,
 372                    bool get_plaintext_key,
 373                    std::string* profile_xml);
 374
 375   // Return true if there is previously stored profile xml for |network_guid|.
 376   bool HaveProfile(const std::string& network_guid);
 377
 378   // Notify |network_list_changed_observer_| that list of visible networks has
 379   // changed to |networks|.
 380   void NotifyNetworkListChanged(const NetworkList& networks);
 381
 382   // Notify |networks_changed_observer_| that network |network_guid| status has
 383   // changed.
 384   void NotifyNetworkChanged(const std::string& network_guid);
 385
 386   // Load WlanApi.dll from SystemDirectory and get Api function pointers.
 387   DWORD LoadWlanLibrary();
 388   // Instance of WlanApi.dll.
 389   HINSTANCE wlan_api_library_;
 390   // WlanApi function pointers
 391   WlanConnectFunction WlanConnect_function_;
 392   WlanCloseHandleFunction WlanCloseHandle_function_;
 393   WlanDisconnectFunction WlanDisconnect_function_;
 394   WlanEnumInterfacesFunction WlanEnumInterfaces_function_;
 395   WlanFreeMemoryFunction WlanFreeMemory_function_;
 396   WlanGetAvailableNetworkListFunction WlanGetAvailableNetworkList_function_;
 397   // WlanGetNetworkBssList function may not be avaiable on Windows XP.
 398   WlanGetNetworkBssListFunction WlanGetNetworkBssList_function_;
 399   WlanGetProfileFunction WlanGetProfile_function_;
 400   WlanOpenHandleFunction WlanOpenHandle_function_;
 401   WlanQueryInterfaceFunction WlanQueryInterface_function_;
 402   WlanRegisterNotificationFunction WlanRegisterNotification_function_;
 403   WlanScanFunction WlanScan_function_;
 404   WlanSetProfileFunction WlanSetProfile_function_;
 405   // WlanSaveTemporaryProfile function may not be avaiable on Windows XP.
 406   WlanSaveTemporaryProfileFunction WlanSaveTemporaryProfile_function_;
 407
 408   // WLAN service handle.
 409   HANDLE client_;
 410   // GUID of the currently connected interface, if any, otherwise the GUID of
 411   // one of the WLAN interfaces.
 412   GUID interface_guid_;
 413   // Temporary storage of network properties indexed by |network_guid|. Persist
 414   // only in memory.
 415   base::DictionaryValue connect_properties_;
 416   // Preserved WLAN profile xml.
 417   std::map<std::string, std::string> saved_profiles_xml_;
 418   // Observer to get notified when network(s) have changed (e.g. connect).
 419   NetworkGuidListCallback networks_changed_observer_;
 420   // Observer to get notified when network list has changed (scan complete).
 421   NetworkGuidListCallback network_list_changed_observer_;
 422   // Saved value of network location wizard show value.
 423   scoped_ptr<DWORD> saved_nw_category_wizard_;
 424   // MessageLoopProxy to post events on UI thread.
 425   scoped_refptr<base::MessageLoopProxy> message_loop_proxy_;
 426   // Task runner for worker tasks.
 427   scoped_refptr<base::SequencedTaskRunner> task_runner_;
 428   // If |false|, then |networks_changed_observer_| is not notified.
 429   bool enable_notify_network_changed_;
 430   // Number of attempts to check that network has connected successfully.
 431   static const int kMaxAttempts = 100;
 432   // Delay between attempts to check that network has connected successfully.
 433   static const int kAttemptDelayMs = 100;
 434   DISALLOW_COPY_AND_ASSIGN(WiFiServiceImpl);
 435 };
 436
 437 WiFiServiceImpl::WiFiServiceImpl()
 438     : wlan_api_library_(NULL),
 439       WlanConnect_function_(NULL),
 440       WlanCloseHandle_function_(NULL),
 441       WlanDisconnect_function_(NULL),
 442       WlanEnumInterfaces_function_(NULL),
 443       WlanFreeMemory_function_(NULL),
 444       WlanGetAvailableNetworkList_function_(NULL),
 445       WlanGetNetworkBssList_function_(NULL),
 446       WlanGetProfile_function_(NULL),
 447       WlanOpenHandle_function_(NULL),
 448       WlanRegisterNotification_function_(NULL),
 449       WlanSaveTemporaryProfile_function_(NULL),
 450       WlanScan_function_(NULL),
 451       WlanSetProfile_function_(NULL),
 452       client_(NULL),
 453       enable_notify_network_changed_(true) {}
 454
 455 WiFiServiceImpl::~WiFiServiceImpl() { UnInitialize(); }
 456
 457 void WiFiServiceImpl::Initialize(
 458     scoped_refptr<base::SequencedTaskRunner> task_runner) {
 459   DCHECK(!client_);
 460   task_runner_.swap(task_runner);
 461   // Restore NwCategoryWizard in case if we crashed during connect.
 462   RestoreNwCategoryWizard();
 463   OpenClientHandle();
 464 }
 465
 466 void WiFiServiceImpl::UnInitialize() {
 467   CloseClientHandle();
 468 }
 469
 470 void WiFiServiceImpl::GetProperties(const std::string& network_guid,
 471                                     base::DictionaryValue* properties,
 472                                     std::string* error) {
 473   DWORD error_code = EnsureInitialized();
 474   if (error_code == ERROR_SUCCESS) {
 475     NetworkList network_list;
 476     error_code = GetVisibleNetworkList(&network_list);
 477     if (error_code == ERROR_SUCCESS && !network_list.empty()) {
 478       NetworkList::const_iterator it = FindNetwork(network_list, network_guid);
 479       if (it != network_list.end()) {
 480         DVLOG(1) << "Get Properties: " << network_guid << ":"
 481                    << it->connection_state;
 482         properties->Swap(it->ToValue(false).get());
 483         return;
 484       } else {
 485         error_code = ERROR_NOT_FOUND;
 486       }
 487     }
 488   }
 489
 490   CheckError(error_code, kWiFiServiceError, error);
 491 }
 492
 493 void WiFiServiceImpl::GetManagedProperties(
 494     const std::string& network_guid,
 495     base::DictionaryValue* managed_properties,
 496     std::string* error) {
 497   CheckError(ERROR_CALL_NOT_IMPLEMENTED, kWiFiServiceError, error);
 498 }
 499
 500 void WiFiServiceImpl::GetState(const std::string& network_guid,
 501                                base::DictionaryValue* properties,
 502                                std::string* error) {
 503   CheckError(ERROR_CALL_NOT_IMPLEMENTED, kWiFiServiceError, error);
 504 }
 505
 506 void WiFiServiceImpl::SetProperties(
 507     const std::string& network_guid,
 508     scoped_ptr<base::DictionaryValue> properties,
 509     std::string* error) {
 510   // Temporary preserve WiFi properties (desired frequency, wifi password) to
 511   // use in StartConnect.
 512   DCHECK(properties.get());
 513   if (!properties->HasKey(onc::network_type::kWiFi)) {
 514     DVLOG(0) << "Missing WiFi properties:" << *properties;
 515     *error = kWiFiServiceError;
 516     return;
 517   }
 518   connect_properties_.SetWithoutPathExpansion(network_guid,
 519                                               properties.release());
 520 }
 521
 522 void WiFiServiceImpl::CreateNetwork(
 523     bool shared,
 524     scoped_ptr<base::DictionaryValue> properties,
 525     std::string* network_guid,
 526     std::string* error) {
 527   DWORD error_code = EnsureInitialized();
 528   if (CheckError(error_code, kWiFiServiceError, error))
 529     return;
 530
 531   WiFiService::NetworkProperties network_properties;
 532   if (!network_properties.UpdateFromValue(*properties)) {
 533     CheckError(ERROR_INVALID_DATA, kWiFiServiceError, error);
 534     return;
 535   }
 536
 537   network_properties.guid = network_properties.ssid;
 538   std::string profile_xml;
 539   if (!CreateProfile(network_properties, &profile_xml)) {
 540     CheckError(ERROR_INVALID_DATA, kWiFiServiceError, error);
 541     return;
 542   }
 543
 544   base::string16 profile_xml16(base::UTF8ToUTF16(profile_xml));
 545   DWORD reason_code = 0u;
 546
 547   error_code = WlanSetProfile_function_(client_,
 548                                         &interface_guid_,
 549                                         shared ? 0 : WLAN_PROFILE_USER,
 550                                         profile_xml16.c_str(),
 551                                         NULL,
 552                                         FALSE,
 553                                         NULL,
 554                                         &reason_code);
 555   if (CheckError(error_code, kWiFiServiceError, error)) {
 556     DVLOG(0) << profile_xml;
 557     DVLOG(0) << "SetProfile Reason Code:" << reason_code;
 558     return;
 559   }
 560
 561   *network_guid = network_properties.guid;
 562 }
 563
 564 void WiFiServiceImpl::GetVisibleNetworks(const std::string& network_type,
 565                                          base::ListValue* network_list) {
 566   if (!network_type.empty() &&
 567       network_type != onc::network_type::kAllTypes &&
 568       network_type != onc::network_type::kWiFi) {
 569     return;
 570   }
 571
 572   DWORD error = EnsureInitialized();
 573   if (error == ERROR_SUCCESS) {
 574     NetworkList networks;
 575     error = GetVisibleNetworkList(&networks);
 576     if (error == ERROR_SUCCESS && !networks.empty()) {
 577       SortNetworks(&networks);
 578       for (WiFiService::NetworkList::const_iterator it = networks.begin();
 579            it != networks.end();
 580            ++it) {
 581         scoped_ptr<base::DictionaryValue> network(it->ToValue(true));
 582         network_list->Append(network.release());
 583       }
 584     }
 585   }
 586 }
 587
 588 void WiFiServiceImpl::RequestNetworkScan() {
 589   DWORD error = EnsureInitialized();
 590   if (error == ERROR_SUCCESS) {
 591     WlanScan_function_(client_, &interface_guid_, NULL, NULL, NULL);
 592   }
 593 }
 594
 595 void WiFiServiceImpl::StartConnect(const std::string& network_guid,
 596                                    std::string* error) {
 597   DVLOG(1) << "Start Connect: " << network_guid;
 598   DWORD error_code = EnsureInitialized();
 599   if (error_code == ERROR_SUCCESS) {
 600     std::string connected_network_guid;
 601     error_code = SaveCurrentConnectedNetwork(&connected_network_guid);
 602     if (error_code == ERROR_SUCCESS) {
 603       // Check, if the network is already connected on desired frequency.
 604       bool already_connected = (network_guid == connected_network_guid);
 605       Frequency frequency = GetFrequencyToConnect(network_guid);
 606       if (already_connected && frequency != kFrequencyAny) {
 607         Frequency connected_frequency = GetConnectedFrequency(network_guid);
 608         already_connected = (frequency == connected_frequency);
 609       }
 610       // Connect only if network |network_guid| is not connected already.
 611       if (!already_connected)
 612         error_code = Connect(network_guid, frequency);
 613       if (error_code == ERROR_SUCCESS) {
 614         // Notify that previously connected network has changed.
 615         NotifyNetworkChanged(connected_network_guid);
 616         // Start waiting for network connection state change.
 617         if (!networks_changed_observer_.is_null()) {
 618           DisableNwCategoryWizard();
 619           // Disable automatic network change notifications as they get fired
 620           // when network is just connected, but not yet accessible (doesn't
 621           // have valid IP address).
 622           enable_notify_network_changed_ = false;
 623           WaitForNetworkConnect(network_guid, 0);
 624           return;
 625         }
 626       }
 627     }
 628   }
 629   CheckError(error_code, kWiFiServiceError, error);
 630 }
 631
 632 void WiFiServiceImpl::StartDisconnect(const std::string& network_guid,
 633                                       std::string* error) {
 634   DVLOG(1) << "Start Disconnect: " << network_guid;
 635   DWORD error_code = EnsureInitialized();
 636   if (error_code == ERROR_SUCCESS) {
 637     std::string connected_network_guid;
 638     error_code = SaveCurrentConnectedNetwork(&connected_network_guid);
 639     if (error_code == ERROR_SUCCESS && network_guid == connected_network_guid) {
 640       error_code = Disconnect();
 641       if (error_code == ERROR_SUCCESS) {
 642         NotifyNetworkChanged(network_guid);
 643         return;
 644       }
 645     }
 646   }
 647   CheckError(error_code, kWiFiServiceError, error);
 648 }
 649
 650 void WiFiServiceImpl::GetKeyFromSystem(const std::string& network_guid,
 651                                        std::string* key_data,
 652                                        std::string* error) {
 653   DWORD error_code = EnsureInitialized();
 654   if (CheckError(error_code, kWiFiServiceError, error))
 655     return;
 656
 657   std::string profile_xml;
 658   error_code = GetProfile(network_guid, true, &profile_xml);
 659   if (CheckError(error_code, kWiFiServiceError, error))
 660     return;
 661
 662   const char kSharedKeyElement[] = "sharedKey";
 663   const char kProtectedElement[] = "protected";
 664   const char kKeyMaterialElement[] = "keyMaterial";
 665
 666   // Quick check to verify presence of <sharedKey> element.
 667   if (profile_xml.find(kSharedKeyElement) == std::string::npos) {
 668     *error = kWiFiServiceError;
 669     return;
 670   }
 671
 672   XmlReader reader;
 673   if (reader.Load(profile_xml)) {
 674     while (reader.Read()) {
 675       reader.SkipToElement();
 676       if (reader.NodeName() == kSharedKeyElement) {
 677         while (reader.Read()) {
 678           reader.SkipToElement();
 679           if (reader.NodeName() == kKeyMaterialElement) {
 680             reader.ReadElementContent(key_data);
 681           } else if (reader.NodeName() == kProtectedElement) {
 682             std::string protected_data;
 683             reader.ReadElementContent(&protected_data);
 684             // Without UAC privilege escalation call to |GetProfile| with
 685             // |WLAN_PROFILE_GET_PLAINTEXT_KEY| flag returns success, but has
 686             // protected keyMaterial. Report an error in this case.
 687             if (protected_data != "false") {
 688               *error = kWiFiServiceError;
 689               break;
 690             }
 691           }
 692         }
 693         return;
 694       }
 695     }
 696   }
 697
 698   // Did not find passphrase in the profile.
 699   *error = kWiFiServiceError;
 700 }
 701
 702 void WiFiServiceImpl::SetEventObservers(
 703     scoped_refptr<base::MessageLoopProxy> message_loop_proxy,
 704     const NetworkGuidListCallback& networks_changed_observer,
 705     const NetworkGuidListCallback& network_list_changed_observer) {
 706   message_loop_proxy_.swap(message_loop_proxy);
 707   networks_changed_observer_ = networks_changed_observer;
 708   network_list_changed_observer_ = network_list_changed_observer;
 709 }
 710
 711 void WiFiServiceImpl::OnWlanNotificationCallback(
 712     PWLAN_NOTIFICATION_DATA wlan_notification_data,
 713     PVOID context) {
 714   WiFiServiceImpl* service = reinterpret_cast<WiFiServiceImpl*>(context);
 715   service->OnWlanNotification(wlan_notification_data);
 716 }
 717
 718 void WiFiServiceImpl::OnWlanNotification(
 719     PWLAN_NOTIFICATION_DATA wlan_notification_data) {
 720   if (message_loop_proxy_ == NULL)
 721     return;
 722   switch (wlan_notification_data->NotificationCode) {
 723     case wlan_notification_acm_disconnected:
 724     case wlan_notification_acm_connection_complete:
 725     case wlan_notification_acm_connection_attempt_fail: {
 726       PWLAN_CONNECTION_NOTIFICATION_DATA wlan_connection_data =
 727           reinterpret_cast<PWLAN_CONNECTION_NOTIFICATION_DATA>(
 728               wlan_notification_data->pData);
 729       message_loop_proxy_->PostTask(
 730           FROM_HERE,
 731           base::Bind(&WiFiServiceImpl::NotifyNetworkChanged,
 732                      base::Unretained(this),
 733                      GUIDFromSSID(wlan_connection_data->dot11Ssid)));
 734       break;
 735     }
 736     case wlan_notification_acm_scan_complete:
 737       message_loop_proxy_->PostTask(
 738           FROM_HERE,
 739           base::Bind(&WiFiServiceImpl::OnNetworkScanCompleteOnMainThread,
 740                      base::Unretained(this)));
 741       break;
 742   }
 743 }
 744
 745 void WiFiServiceImpl::OnNetworkScanCompleteOnMainThread() {
 746   NetworkList networks;
 747   // Get current list of visible networks and notify that network list has
 748   // changed.
 749   DWORD error = GetVisibleNetworkList(&networks);
 750   DCHECK(error == ERROR_SUCCESS);
 751   if (error == ERROR_SUCCESS)
 752     NotifyNetworkListChanged(networks);
 753 }
 754
 755 void WiFiServiceImpl::WaitForNetworkConnect(const std::string& network_guid,
 756                                             int attempt) {
 757   // If network didn't get connected in |kMaxAttempts|, then restore automatic
 758   // network change notifications and stop waiting.
 759   if (attempt > kMaxAttempts) {
 760     DLOG(ERROR) << kMaxAttempts << " attempts exceeded waiting for connect to "
 761                 << network_guid;
 762     enable_notify_network_changed_ = true;
 763     RestoreNwCategoryWizard();
 764     return;
 765   }
 766   std::string connected_network_guid;
 767   DWORD error = FindConnectedNetwork(&connected_network_guid);
 768   if (network_guid == connected_network_guid) {
 769     DVLOG(1) << "WiFi Connected, Reset DHCP: " << network_guid;
 770     // Even though wireless network is now connected, it may still be unusable,
 771     // e.g. after Chromecast device reset. Reset DHCP on wireless network to
 772     // work around this issue.
 773     error = ResetDHCP();
 774     // Restore previously suppressed notifications.
 775     enable_notify_network_changed_ = true;
 776     RestoreNwCategoryWizard();
 777     NotifyNetworkChanged(network_guid);
 778   } else {
 779     // Continue waiting for network connection state change.
 780     task_runner_->PostDelayedTask(
 781         FROM_HERE,
 782         base::Bind(&WiFiServiceImpl::WaitForNetworkConnect,
 783                    base::Unretained(this),
 784                    network_guid,
 785                    ++attempt),
 786         base::TimeDelta::FromMilliseconds(kAttemptDelayMs));
 787   }
 788 }
 789
 790 bool WiFiServiceImpl::CheckError(DWORD error_code,
 791                                  const std::string& error_name,
 792                                  std::string* error) const {
 793   if (error_code != ERROR_SUCCESS) {
 794     DLOG(ERROR) << "WiFiService Error " << error_code << ": " << error_name;
 795     *error = error_name;
 796     return true;
 797   }
 798   return false;
 799 }
 800
 801 WiFiService::NetworkList::iterator WiFiServiceImpl::FindNetwork(
 802     NetworkList& networks,
 803     const std::string& network_guid) {
 804   for (NetworkList::iterator it = networks.begin(); it != networks.end();
 805        ++it) {
 806     if (it->guid == network_guid)
 807       return it;
 808   }
 809   return networks.end();
 810 }
 811
 812 DWORD WiFiServiceImpl::SaveCurrentConnectedNetwork(
 813     std::string* connected_network_guid) {
 814   // Find currently connected network.
 815   DWORD error = FindConnectedNetwork(connected_network_guid);
 816   if (error == ERROR_SUCCESS && !connected_network_guid->empty()) {
 817     if (error == ERROR_SUCCESS) {
 818       SaveTempProfile(*connected_network_guid);
 819       std::string profile_xml;
 820       error = GetProfile(*connected_network_guid, false, &profile_xml);
 821       if (error == ERROR_SUCCESS) {
 822         saved_profiles_xml_[*connected_network_guid] = profile_xml;
 823       }
 824     }
 825   }
 826   return error;
 827 }
 828
 829 void WiFiServiceImpl::SortNetworks(NetworkList* networks) {
 830   networks->sort(NetworkProperties::OrderByType);
 831 }
 832
 833 DWORD WiFiServiceImpl::LoadWlanLibrary() {
 834   // Use an absolute path to load the DLL to avoid DLL preloading attacks.
 835   base::FilePath path;
 836   if (!PathService::Get(base::DIR_SYSTEM, &path)) {
 837     DLOG(ERROR) << "Unable to get system path.";
 838     return ERROR_NOT_FOUND;
 839   }
 840   wlan_api_library_ = ::LoadLibraryEx(path.Append(kWlanApiDll).value().c_str(),
 841                                       NULL,
 842                                       LOAD_WITH_ALTERED_SEARCH_PATH);
 843   if (!wlan_api_library_) {
 844     DLOG(ERROR) << "Unable to load WlanApi.dll.";
 845     return ERROR_NOT_FOUND;
 846   }
 847
 848   // Initialize WlanApi function pointers
 849   WlanConnect_function_ =
 850       reinterpret_cast<WlanConnectFunction>(
 851           ::GetProcAddress(wlan_api_library_, kWlanConnect));
 852   WlanCloseHandle_function_ =
 853       reinterpret_cast<WlanCloseHandleFunction>(
 854           ::GetProcAddress(wlan_api_library_, kWlanCloseHandle));
 855   WlanDisconnect_function_ =
 856       reinterpret_cast<WlanDisconnectFunction>(
 857           ::GetProcAddress(wlan_api_library_, kWlanDisconnect));
 858   WlanEnumInterfaces_function_ =
 859       reinterpret_cast<WlanEnumInterfacesFunction>(
 860           ::GetProcAddress(wlan_api_library_, kWlanEnumInterfaces));
 861   WlanFreeMemory_function_ =
 862       reinterpret_cast<WlanFreeMemoryFunction>(
 863           ::GetProcAddress(wlan_api_library_, kWlanFreeMemory));
 864   WlanGetAvailableNetworkList_function_ =
 865       reinterpret_cast<WlanGetAvailableNetworkListFunction>(
 866           ::GetProcAddress(wlan_api_library_, kWlanGetAvailableNetworkList));
 867   WlanGetNetworkBssList_function_ =
 868       reinterpret_cast<WlanGetNetworkBssListFunction>(
 869           ::GetProcAddress(wlan_api_library_, kWlanGetNetworkBssList));
 870   WlanGetProfile_function_ =
 871       reinterpret_cast<WlanGetProfileFunction>(
 872           ::GetProcAddress(wlan_api_library_, kWlanGetProfile));
 873   WlanOpenHandle_function_ =
 874       reinterpret_cast<WlanOpenHandleFunction>(
 875           ::GetProcAddress(wlan_api_library_, kWlanOpenHandle));
 876   WlanQueryInterface_function_ =
 877       reinterpret_cast<WlanQueryInterfaceFunction>(
 878           ::GetProcAddress(wlan_api_library_, kWlanQueryInterface));
 879   WlanRegisterNotification_function_ =
 880       reinterpret_cast<WlanRegisterNotificationFunction>(
 881           ::GetProcAddress(wlan_api_library_, kWlanRegisterNotification));
 882   WlanSaveTemporaryProfile_function_ =
 883       reinterpret_cast<WlanSaveTemporaryProfileFunction>(
 884           ::GetProcAddress(wlan_api_library_, kWlanSaveTemporaryProfile));
 885   WlanScan_function_ =
 886       reinterpret_cast<WlanScanFunction>(
 887           ::GetProcAddress(wlan_api_library_, kWlanScan));
 888   WlanSetProfile_function_ =
 889       reinterpret_cast<WlanSetProfileFunction>(
 890           ::GetProcAddress(wlan_api_library_, kWlanSetProfile));
 891
 892   if (!WlanConnect_function_ ||
 893       !WlanCloseHandle_function_ ||
 894       !WlanDisconnect_function_ ||
 895       !WlanEnumInterfaces_function_ ||
 896       !WlanFreeMemory_function_ ||
 897       !WlanGetAvailableNetworkList_function_ ||
 898       !WlanGetProfile_function_ ||
 899       !WlanOpenHandle_function_ ||
 900       !WlanQueryInterface_function_ ||
 901       !WlanRegisterNotification_function_ ||
 902       !WlanScan_function_ ||
 903       !WlanSetProfile_function_) {
 904     DLOG(ERROR) << "Unable to find required WlanApi function.";
 905     FreeLibrary(wlan_api_library_);
 906     wlan_api_library_ = NULL;
 907     return ERROR_NOT_FOUND;
 908   }
 909
 910   // Some WlanApi functions may not be available on XP.
 911   if (!WlanGetNetworkBssList_function_ ||
 912       !WlanSaveTemporaryProfile_function_) {
 913     DVLOG(1) << "WlanApi function is not be available on XP.";
 914   }
 915
 916   return ERROR_SUCCESS;
 917 }
 918
 919 DWORD WiFiServiceImpl::OpenClientHandle() {
 920   DWORD error = LoadWlanLibrary();
 921   DWORD service_version = 0;
 922
 923   if (error != ERROR_SUCCESS)
 924     return error;
 925
 926   // Open a handle to the service.
 927   error = WlanOpenHandle_function_(1, NULL, &service_version, &client_);
 928
 929   PWLAN_INTERFACE_INFO_LIST interface_list = NULL;
 930   if (error == ERROR_SUCCESS) {
 931     // Enumerate wireless interfaces.
 932     error = WlanEnumInterfaces_function_(client_, NULL, &interface_list);
 933     if (error == ERROR_SUCCESS) {
 934       if (interface_list != NULL && interface_list->dwNumberOfItems != 0) {
 935         // Remember first interface just in case if none are connected.
 936         interface_guid_ = interface_list->InterfaceInfo[0].InterfaceGuid;
 937         // Try to find a connected interface.
 938         for (DWORD itf = 0; itf < interface_list->dwNumberOfItems; ++itf) {
 939           if (interface_list->InterfaceInfo[itf].isState ==
 940               wlan_interface_state_connected) {
 941             // Found connected interface, remember it!
 942             interface_guid_ = interface_list->InterfaceInfo[itf].InterfaceGuid;
 943             break;
 944           }
 945         }
 946         WlanRegisterNotification_function_(client_,
 947                                            WLAN_NOTIFICATION_SOURCE_ALL,
 948                                            FALSE,
 949                                            OnWlanNotificationCallback,
 950                                            this,
 951                                            NULL,
 952                                            NULL);
 953       } else {
 954         error = ERROR_NOINTERFACE;
 955       }
 956     }
 957     // Clean up..
 958     if (interface_list != NULL)
 959       WlanFreeMemory_function_(interface_list);
 960   }
 961   return error;
 962 }
 963
 964 DWORD WiFiServiceImpl::ResetDHCP() {
 965   IP_ADAPTER_INDEX_MAP adapter_index_map = {0};
 966   DWORD error = FindAdapterIndexMapByGUID(interface_guid_, &adapter_index_map);
 967   if (error == ERROR_SUCCESS) {
 968     error = ::IpReleaseAddress(&adapter_index_map);
 969     if (error == ERROR_SUCCESS) {
 970       error = ::IpRenewAddress(&adapter_index_map);
 971     }
 972   }
 973   return error;
 974 }
 975
 976 DWORD WiFiServiceImpl::FindAdapterIndexMapByGUID(
 977     const GUID& interface_guid,
 978     IP_ADAPTER_INDEX_MAP* adapter_index_map) {
 979   base::string16 guid_string;
 980   const int kGUIDSize = 39;
 981   ::StringFromGUID2(
 982       interface_guid, WriteInto(&guid_string, kGUIDSize), kGUIDSize);
 983
 984   ULONG buffer_length = 0;
 985   DWORD error = ::GetInterfaceInfo(NULL, &buffer_length);
 986   if (error == ERROR_INSUFFICIENT_BUFFER) {
 987     scoped_ptr<unsigned char[]> buffer(new unsigned char[buffer_length]);
 988     IP_INTERFACE_INFO* interface_info =
 989         reinterpret_cast<IP_INTERFACE_INFO*>(buffer.get());
 990     error = GetInterfaceInfo(interface_info, &buffer_length);
 991     if (error == ERROR_SUCCESS) {
 992       for (int adapter = 0; adapter < interface_info->NumAdapters; ++adapter) {
 993         if (EndsWith(
 994                 interface_info->Adapter[adapter].Name, guid_string, false)) {
 995           *adapter_index_map = interface_info->Adapter[adapter];
 996           break;
 997         }
 998       }
 999     }
1000   }
1001   return error;
1002 }
1003
1004 DWORD WiFiServiceImpl::DisableNwCategoryWizard() {
1005   base::win::RegKey nw_category_wizard;
1006   DWORD error = nw_category_wizard.Open(HKEY_CURRENT_USER,
1007                                         kNwCategoryWizardRegKey,
1008                                         KEY_READ | KEY_SET_VALUE);
1009   if (error == ERROR_SUCCESS) {
1010     // Save current value if present.
1011     if (nw_category_wizard.HasValue(kNwCategoryWizardRegValue)) {
1012       DWORD saved = 0u;
1013       error = nw_category_wizard.ReadValueDW(kNwCategoryWizardRegValue,
1014                                              &saved);
1015       if (error == ERROR_SUCCESS) {
1016         error = nw_category_wizard.WriteValue(kNwCategoryWizardSavedRegValue,
1017                                               saved);
1018       }
1019     } else {
1020       // Mark that temporary value has to be deleted.
1021       error = nw_category_wizard.WriteValue(kNwCategoryWizardDeleteRegValue,
1022                                             1u);
1023     }
1024
1025     // Disable network location wizard.
1026     error = nw_category_wizard.WriteValue(kNwCategoryWizardRegValue,
1027                                           static_cast<DWORD>(0));
1028   }
1029
1030   return error;
1031 }
1032
1033 DWORD WiFiServiceImpl::RestoreNwCategoryWizard() {
1034   base::win::RegKey nw_category_wizard;
1035   DWORD error = nw_category_wizard.Open(HKEY_CURRENT_USER,
1036                                         kNwCategoryWizardRegKey,
1037                                         KEY_SET_VALUE);
1038   if (error == ERROR_SUCCESS) {
1039     // Restore saved value if present.
1040     if (nw_category_wizard.HasValue(kNwCategoryWizardSavedRegValue)) {
1041       DWORD saved = 0u;
1042       error = nw_category_wizard.ReadValueDW(kNwCategoryWizardSavedRegValue,
1043                                              &saved);
1044       if (error == ERROR_SUCCESS) {
1045         error = nw_category_wizard.WriteValue(kNwCategoryWizardRegValue,
1046                                               saved);
1047         error = nw_category_wizard.DeleteValue(kNwCategoryWizardSavedRegValue);
1048       }
1049     } else if (nw_category_wizard.HasValue(kNwCategoryWizardDeleteRegValue)) {
1050       error = nw_category_wizard.DeleteValue(kNwCategoryWizardRegValue);
1051       error = nw_category_wizard.DeleteValue(kNwCategoryWizardDeleteRegValue);
1052     }
1053   }
1054
1055   return error;
1056 }
1057
1058 DWORD WiFiServiceImpl::EnsureInitialized() {
1059   if (client_ != NULL)
1060     return ERROR_SUCCESS;
1061   return ERROR_NOINTERFACE;
1062 }
1063
1064 DWORD WiFiServiceImpl::CloseClientHandle() {
1065   DWORD error = ERROR_SUCCESS;
1066   if (client_ != NULL) {
1067     error = WlanCloseHandle_function_(client_, NULL);
1068     client_ = NULL;
1069   }
1070   if (wlan_api_library_ != NULL) {
1071     WlanConnect_function_ = NULL;
1072     WlanCloseHandle_function_ = NULL;
1073     WlanDisconnect_function_ = NULL;
1074     WlanEnumInterfaces_function_ = NULL;
1075     WlanFreeMemory_function_ = NULL;
1076     WlanGetAvailableNetworkList_function_ = NULL;
1077     WlanGetNetworkBssList_function_ = NULL;
1078     WlanGetProfile_function_ = NULL;
1079     WlanOpenHandle_function_ = NULL;
1080     WlanRegisterNotification_function_ = NULL;
1081     WlanSaveTemporaryProfile_function_ = NULL;
1082     WlanScan_function_ = NULL;
1083     WlanSetProfile_function_ = NULL;
1084     ::FreeLibrary(wlan_api_library_);
1085     wlan_api_library_ = NULL;
1086   }
1087   return error;
1088 }
1089
1090 DOT11_SSID WiFiServiceImpl::SSIDFromGUID(
1091     const std::string& network_guid) const {
1092   DOT11_SSID ssid = {0};
1093   if (network_guid.length() <= DOT11_SSID_MAX_LENGTH) {
1094     ssid.uSSIDLength = static_cast<ULONG>(network_guid.length());
1095     strncpy(reinterpret_cast<char*>(ssid.ucSSID),
1096             network_guid.c_str(),
1097             ssid.uSSIDLength);
1098   } else {
1099     NOTREACHED();
1100   }
1101   return ssid;
1102 }
1103
1104 std::string WiFiServiceImpl::SecurityFromDot11AuthAlg(
1105     DOT11_AUTH_ALGORITHM alg) const {
1106   switch (alg) {
1107     case DOT11_AUTH_ALGO_RSNA:
1108       return onc::wifi::kWPA_EAP;
1109     case DOT11_AUTH_ALGO_RSNA_PSK:
1110       return onc::wifi::kWPA_PSK;
1111     case DOT11_AUTH_ALGO_80211_SHARED_KEY:
1112       return onc::wifi::kWEP_PSK;
1113     case DOT11_AUTH_ALGO_80211_OPEN:
1114       return onc::wifi::kNone;
1115     default:
1116       return onc::wifi::kWPA_EAP;
1117   }
1118 }
1119
1120 void WiFiServiceImpl::NetworkPropertiesFromAvailableNetwork(
1121     const WLAN_AVAILABLE_NETWORK& wlan,
1122     const WLAN_BSS_LIST& wlan_bss_list,
1123     NetworkProperties* properties) {
1124   if (wlan.dwFlags & WLAN_AVAILABLE_NETWORK_CONNECTED) {
1125     properties->connection_state = onc::connection_state::kConnected;
1126   } else {
1127     properties->connection_state = onc::connection_state::kNotConnected;
1128   }
1129
1130   properties->ssid = SSIDFromWLAN(wlan);
1131   properties->name = properties->ssid;
1132   properties->guid = GUIDFromWLAN(wlan);
1133   properties->type = onc::network_type::kWiFi;
1134
1135   for (size_t bss = 0; bss < wlan_bss_list.dwNumberOfItems; ++bss) {
1136     const WLAN_BSS_ENTRY& bss_entry(wlan_bss_list.wlanBssEntries[bss]);
1137     if (bss_entry.dot11Ssid.uSSIDLength == wlan.dot11Ssid.uSSIDLength &&
1138         0 == memcmp(bss_entry.dot11Ssid.ucSSID,
1139                     wlan.dot11Ssid.ucSSID,
1140                     bss_entry.dot11Ssid.uSSIDLength)) {
1141       properties->frequency = GetNormalizedFrequency(
1142           bss_entry.ulChCenterFrequency / 1000);
1143       properties->frequency_set.insert(properties->frequency);
1144       properties->bssid = NetworkProperties::MacAddressAsString(
1145           bss_entry.dot11Bssid);
1146     }
1147   }
1148   properties->security =
1149       SecurityFromDot11AuthAlg(wlan.dot11DefaultAuthAlgorithm);
1150   properties->signal_strength = wlan.wlanSignalQuality;
1151 }
1152
1153 // Get the list of visible wireless networks
1154 DWORD WiFiServiceImpl::GetVisibleNetworkList(NetworkList* network_list) {
1155   if (client_ == NULL) {
1156     NOTREACHED();
1157     return ERROR_NOINTERFACE;
1158   }
1159
1160   DWORD error = ERROR_SUCCESS;
1161   PWLAN_AVAILABLE_NETWORK_LIST available_network_list = NULL;
1162   PWLAN_BSS_LIST bss_list = NULL;
1163
1164   error = WlanGetAvailableNetworkList_function_(
1165       client_,
1166       &interface_guid_,
1167       WLAN_AVAILABLE_NETWORK_INCLUDE_ALL_MANUAL_HIDDEN_PROFILES,
1168       NULL,
1169       &available_network_list);
1170
1171   std::set<std::string> network_guids;
1172
1173   if (error == ERROR_SUCCESS &&
1174       available_network_list &&
1175       WlanGetNetworkBssList_function_) {
1176     // TODO(mef): WlanGetNetworkBssList is not available on XP. If XP support is
1177     // needed, then different method of getting BSS (e.g. OID query) will have
1178     // to be used.
1179     error = WlanGetNetworkBssList_function_(client_,
1180                                             &interface_guid_,
1181                                             NULL,
1182                                             dot11_BSS_type_any,
1183                                             FALSE,
1184                                             NULL,
1185                                             &bss_list);
1186     if (error == ERROR_SUCCESS && NULL != bss_list) {
1187       for (DWORD i = 0; i < available_network_list->dwNumberOfItems; ++i) {
1188         NetworkProperties network_properties;
1189         NetworkPropertiesFromAvailableNetwork(
1190             available_network_list->Network[i],
1191             *bss_list,
1192             &network_properties);
1193         // Check for duplicate network guids.
1194         if (network_guids.count(network_properties.guid)) {
1195           // There should be no difference between properties except for
1196           // |connection_state|, so mark it as |kConnected| if either one is.
1197           if (network_properties.connection_state ==
1198               onc::connection_state::kConnected) {
1199             NetworkList::iterator previous_network_properties =
1200                 FindNetwork(*network_list, network_properties.guid);
1201             DCHECK(previous_network_properties != network_list->end());
1202             previous_network_properties->connection_state =
1203                 network_properties.connection_state;
1204           }
1205         } else {
1206           network_list->push_back(network_properties);
1207         }
1208         network_guids.insert(network_properties.guid);
1209       }
1210     }
1211   }
1212
1213   // Clean up.
1214   if (available_network_list != NULL) {
1215     WlanFreeMemory_function_(available_network_list);
1216   }
1217   if (bss_list != NULL) {
1218     WlanFreeMemory_function_(bss_list);
1219   }
1220   return error;
1221 }
1222
1223 // Find currently connected network.
1224 DWORD WiFiServiceImpl::FindConnectedNetwork(
1225     std::string* connected_network_guid) {
1226   if (client_ == NULL) {
1227     NOTREACHED();
1228     return ERROR_NOINTERFACE;
1229   }
1230
1231   DWORD error = ERROR_SUCCESS;
1232   PWLAN_AVAILABLE_NETWORK_LIST available_network_list = NULL;
1233   error = WlanGetAvailableNetworkList_function_(
1234       client_, &interface_guid_, 0, NULL, &available_network_list);
1235
1236   if (error == ERROR_SUCCESS && NULL != available_network_list) {
1237     for (DWORD i = 0; i < available_network_list->dwNumberOfItems; ++i) {
1238       const WLAN_AVAILABLE_NETWORK& wlan = available_network_list->Network[i];
1239       if (wlan.dwFlags & WLAN_AVAILABLE_NETWORK_CONNECTED) {
1240         *connected_network_guid = GUIDFromWLAN(wlan);
1241         break;
1242       }
1243     }
1244   }
1245
1246   // Clean up.
1247   if (available_network_list != NULL) {
1248     WlanFreeMemory_function_(available_network_list);
1249   }
1250
1251   return error;
1252 }
1253
1254 WiFiService::Frequency WiFiServiceImpl::GetConnectedFrequency(
1255     const std::string& network_guid) {
1256   if (client_ == NULL) {
1257     NOTREACHED();
1258     return kFrequencyUnknown;
1259   }
1260
1261   // TODO(mef): WlanGetNetworkBssList is not available on XP. If XP support is
1262   // needed, then different method of getting BSS (e.g. OID query) will have
1263   // to be used.
1264   if (WlanGetNetworkBssList_function_ == NULL)
1265     return kFrequencyUnknown;
1266
1267   Frequency frequency = kFrequencyUnknown;
1268   DWORD error = ERROR_SUCCESS;
1269   DWORD data_size = 0;
1270   PWLAN_CONNECTION_ATTRIBUTES wlan_connection_attributes = NULL;
1271   PWLAN_BSS_LIST bss_list = NULL;
1272   error = WlanQueryInterface_function_(
1273       client_,
1274       &interface_guid_,
1275       wlan_intf_opcode_current_connection,
1276       NULL,
1277       &data_size,
1278       reinterpret_cast<PVOID*>(&wlan_connection_attributes),
1279       NULL);
1280   if (error == ERROR_SUCCESS &&
1281       wlan_connection_attributes != NULL &&
1282       wlan_connection_attributes->isState == wlan_interface_state_connected) {
1283     WLAN_ASSOCIATION_ATTRIBUTES& connected_wlan =
1284         wlan_connection_attributes->wlanAssociationAttributes;
1285     // Try to find connected frequency based on bss.
1286     if (GUIDFromSSID(connected_wlan.dot11Ssid) == network_guid &&
1287         WlanGetNetworkBssList_function_ != NULL) {
1288       error = WlanGetNetworkBssList_function_(client_,
1289                                               &interface_guid_,
1290                                               &connected_wlan.dot11Ssid,
1291                                               connected_wlan.dot11BssType,
1292                                               FALSE,
1293                                               NULL,
1294                                               &bss_list);
1295       if (error == ERROR_SUCCESS && NULL != bss_list) {
1296         // Go through bss_list and find matching BSSID.
1297         for (size_t bss = 0; bss < bss_list->dwNumberOfItems; ++bss) {
1298           const WLAN_BSS_ENTRY& bss_entry(bss_list->wlanBssEntries[bss]);
1299           if (0 == memcmp(bss_entry.dot11Bssid,
1300                           connected_wlan.dot11Bssid,
1301                           sizeof(bss_entry.dot11Bssid))) {
1302             frequency = GetNormalizedFrequency(
1303                 bss_entry.ulChCenterFrequency / 1000);
1304             break;
1305           }
1306         }
1307       }
1308     }
1309   }
1310
1311   // Clean up.
1312   if (wlan_connection_attributes != NULL) {
1313     WlanFreeMemory_function_(wlan_connection_attributes);
1314   }
1315
1316   if (bss_list != NULL) {
1317     WlanFreeMemory_function_(bss_list);
1318   }
1319
1320   return frequency;
1321 }
1322
1323 WiFiService::Frequency WiFiServiceImpl::GetFrequencyToConnect(
1324     const std::string& network_guid) const {
1325   // Check whether desired frequency is set in |connect_properties_|.
1326   const base::DictionaryValue* properties;
1327   const base::DictionaryValue* wifi;
1328   int frequency;
1329   if (connect_properties_.GetDictionaryWithoutPathExpansion(
1330           network_guid, &properties) &&
1331       properties->GetDictionary(onc::network_type::kWiFi, &wifi) &&
1332       wifi->GetInteger(onc::wifi::kFrequency, &frequency)) {
1333     return GetNormalizedFrequency(frequency);
1334   }
1335   return kFrequencyAny;
1336 }
1337
1338 DWORD WiFiServiceImpl::GetDesiredBssList(
1339     DOT11_SSID& ssid,
1340     Frequency frequency,
1341     scoped_ptr<DOT11_BSSID_LIST>* desired_list) {
1342   if (client_ == NULL) {
1343     NOTREACHED();
1344     return ERROR_NOINTERFACE;
1345   }
1346
1347   desired_list->reset();
1348
1349   if (frequency == kFrequencyAny)
1350     return ERROR_SUCCESS;
1351
1352   // TODO(mef): WlanGetNetworkBssList is not available on XP. If XP support is
1353   // needed, then different method of getting BSS (e.g. OID query) will have
1354   // to be used.
1355   if (!WlanGetNetworkBssList_function_)
1356     return ERROR_NOT_SUPPORTED;
1357
1358   DWORD error = ERROR_SUCCESS;
1359   PWLAN_BSS_LIST bss_list = NULL;
1360
1361   error = WlanGetNetworkBssList_function_(client_,
1362                                           &interface_guid_,
1363                                           &ssid,
1364                                           dot11_BSS_type_infrastructure,
1365                                           FALSE,
1366                                           NULL,
1367                                           &bss_list);
1368   if (error == ERROR_SUCCESS && NULL != bss_list) {
1369     unsigned int best_quality = 0u;
1370     size_t best_index = 0;
1371     Frequency bss_frequency;
1372
1373     // Go through bss_list and find best quality BSSID with matching frequency.
1374     for (size_t bss = 0; bss < bss_list->dwNumberOfItems; ++bss) {
1375       const WLAN_BSS_ENTRY& bss_entry(bss_list->wlanBssEntries[bss]);
1376       if (bss_entry.dot11Ssid.uSSIDLength != ssid.uSSIDLength ||
1377           0 != memcmp(bss_entry.dot11Ssid.ucSSID,
1378                       ssid.ucSSID,
1379                       bss_entry.dot11Ssid.uSSIDLength))
1380         continue;
1381
1382       bss_frequency = GetNormalizedFrequency(
1383           bss_entry.ulChCenterFrequency / 1000);
1384       if (bss_frequency == frequency &&
1385           bss_entry.uLinkQuality > best_quality) {
1386         best_quality = bss_entry.uLinkQuality;
1387         best_index = bss;
1388       }
1389     }
1390
1391     // If any matching BSS were found, prepare the header.
1392     if (best_quality > 0) {
1393       const WLAN_BSS_ENTRY& bss_entry(bss_list->wlanBssEntries[best_index]);
1394       scoped_ptr<DOT11_BSSID_LIST> selected_list(new DOT11_BSSID_LIST);
1395
1396       selected_list->Header.Revision = DOT11_BSSID_LIST_REVISION_1;
1397       selected_list->Header.Size = sizeof(DOT11_BSSID_LIST);
1398       selected_list->Header.Type = NDIS_OBJECT_TYPE_DEFAULT;
1399       selected_list->uNumOfEntries = 1;
1400       selected_list->uTotalNumOfEntries = 1;
1401       std::copy(bss_entry.dot11Bssid,
1402                 bss_entry.dot11Bssid+sizeof(bss_entry.dot11Bssid),
1403                 selected_list->BSSIDs[0]);
1404       desired_list->swap(selected_list);
1405       DVLOG(1) << "Quality: " << best_quality << " BSS: "
1406           << NetworkProperties::MacAddressAsString(bss_entry.dot11Bssid);
1407     } else {
1408       error = ERROR_NOT_FOUND;
1409     }
1410   }
1411
1412   // Clean up.
1413   if (bss_list != NULL) {
1414     WlanFreeMemory_function_(bss_list);
1415   }
1416   return error;
1417 }
1418
1419 WiFiService::Frequency WiFiServiceImpl::GetNormalizedFrequency(
1420     int frequency_in_mhz) const {
1421   if (frequency_in_mhz == 0)
1422     return kFrequencyAny;
1423   if (frequency_in_mhz < 3000)
1424     return kFrequency2400;
1425   return kFrequency5000;
1426 }
1427
1428 DWORD WiFiServiceImpl::Connect(const std::string& network_guid,
1429                                Frequency frequency) {
1430   if (client_ == NULL) {
1431     NOTREACHED();
1432     return ERROR_NOINTERFACE;
1433   }
1434
1435   DWORD error = ERROR_SUCCESS;
1436   DOT11_SSID ssid = SSIDFromGUID(network_guid);
1437   scoped_ptr<DOT11_BSSID_LIST> desired_bss_list;
1438   error = GetDesiredBssList(ssid, frequency, &desired_bss_list);
1439   if (error == ERROR_SUCCESS) {
1440     if (HaveProfile(network_guid)) {
1441       base::string16 profile_name = ProfileNameFromGUID(network_guid);
1442       WLAN_CONNECTION_PARAMETERS wlan_params = {
1443           wlan_connection_mode_profile,
1444           profile_name.c_str(),
1445           NULL,
1446           desired_bss_list.get(),
1447           dot11_BSS_type_any,
1448           0};
1449       error = WlanConnect_function_(
1450           client_, &interface_guid_, &wlan_params, NULL);
1451     } else {
1452       // TODO(mef): wlan_connection_mode_discovery_unsecure is not available on
1453       // XP. If XP support is needed, then temporary profile will have to be
1454       // created.
1455       WLAN_CONNECTION_PARAMETERS wlan_params = {
1456           wlan_connection_mode_discovery_unsecure,
1457           NULL,
1458           &ssid,
1459           desired_bss_list.get(),
1460           dot11_BSS_type_infrastructure,
1461           0};
1462       error = WlanConnect_function_(
1463           client_, &interface_guid_, &wlan_params, NULL);
1464     }
1465   }
1466
1467   return error;
1468 }
1469
1470 DWORD WiFiServiceImpl::Disconnect() {
1471   if (client_ == NULL) {
1472     NOTREACHED();
1473     return ERROR_NOINTERFACE;
1474   }
1475
1476   DWORD error = ERROR_SUCCESS;
1477   error = WlanDisconnect_function_(client_, &interface_guid_, NULL);
1478   return error;
1479 }
1480
1481 DWORD WiFiServiceImpl::SaveTempProfile(const std::string& network_guid) {
1482   if (client_ == NULL) {
1483     NOTREACHED();
1484     return ERROR_NOINTERFACE;
1485   }
1486
1487   DWORD error = ERROR_SUCCESS;
1488   base::string16 profile_name = ProfileNameFromGUID(network_guid);
1489   // TODO(mef): WlanSaveTemporaryProfile is not available on XP. If XP support
1490   // is needed, then different method of saving network profile will have to be
1491   // used.
1492   if (WlanSaveTemporaryProfile_function_) {
1493     error = WlanSaveTemporaryProfile_function_(client_,
1494                                                &interface_guid_,
1495                                                profile_name.c_str(),
1496                                                NULL,
1497                                                WLAN_PROFILE_USER,
1498                                                true,
1499                                                NULL);
1500   } else {
1501     error = ERROR_NOT_SUPPORTED;
1502   }
1503   return error;
1504 }
1505
1506 DWORD WiFiServiceImpl::GetProfile(const std::string& network_guid,
1507                                   bool get_plaintext_key,
1508                                   std::string* profile_xml) {
1509   if (client_ == NULL) {
1510     NOTREACHED();
1511     return ERROR_NOINTERFACE;
1512   }
1513
1514   DWORD error = ERROR_SUCCESS;
1515   base::string16 profile_name = ProfileNameFromGUID(network_guid);
1516   DWORD flags = get_plaintext_key ? WLAN_PROFILE_GET_PLAINTEXT_KEY : 0;
1517   LPWSTR str_profile_xml = NULL;
1518   error = WlanGetProfile_function_(client_,
1519                                    &interface_guid_,
1520                                    profile_name.c_str(),
1521                                    NULL,
1522                                    &str_profile_xml,
1523                                    &flags,
1524                                    NULL);
1525
1526   if (error == ERROR_SUCCESS && str_profile_xml != NULL) {
1527     *profile_xml = base::UTF16ToUTF8(str_profile_xml);
1528   }
1529   // Clean up.
1530   if (str_profile_xml != NULL) {
1531     WlanFreeMemory_function_(str_profile_xml);
1532   }
1533
1534   return error;
1535 }
1536
1537 bool WiFiServiceImpl::HaveProfile(const std::string& network_guid) {
1538   DWORD error = ERROR_SUCCESS;
1539   std::string profile_xml;
1540   return GetProfile(network_guid, false, &profile_xml) == ERROR_SUCCESS;
1541 }
1542
1543 bool WiFiServiceImpl::AuthEncryptionFromSecurity(
1544     const std::string& security,
1545     std::string* authentication,
1546     std::string* encryption,
1547     std::string* key_type) const {
1548   if (security == onc::wifi::kNone) {
1549     *authentication = kAuthenticationOpen;
1550     *encryption = kEncryptionNone;
1551   } else if (security == onc::wifi::kWEP_PSK) {
1552     *authentication = kAuthenticationOpen;
1553     *encryption = kEncryptionWEP;
1554     *key_type = kKeyTypeNetwork;
1555   } else if (security == onc::wifi::kWPA_PSK) {
1556     *authentication = kAuthenticationWpaPsk;
1557     // TODO(mef): WAP |encryption| could be either |AES| or |TKIP|. It has to be
1558     // determined and adjusted properly during |Connect|.
1559     *encryption = kEncryptionAES;
1560     *key_type = kKeyTypePassphrase;
1561   } else if (security == onc::wifi::kWPA2_PSK) {
1562     *authentication = kAuthenticationWpa2Psk;
1563     // TODO(mef): WAP |encryption| could be either |AES| or |TKIP|. It has to be
1564     // determined and adjusted properly during |Connect|.
1565     *encryption = kEncryptionAES;
1566     *key_type = kKeyTypePassphrase;
1567   } else {
1568     return false;
1569   }
1570   return true;
1571 }
1572
1573 bool WiFiServiceImpl::CreateProfile(
1574     const NetworkProperties& network_properties,
1575     std::string* profile_xml) {
1576   // Get authentication and encryption values from security.
1577   std::string authentication;
1578   std::string encryption;
1579   std::string key_type;
1580   bool valid = AuthEncryptionFromSecurity(network_properties.security,
1581                                           &authentication,
1582                                           &encryption,
1583                                           &key_type);
1584   if (!valid)
1585     return valid;
1586
1587   // Generate profile XML.
1588   XmlWriter xml_writer;
1589   xml_writer.StartWriting();
1590   xml_writer.StartElement("WLANProfile");
1591   xml_writer.AddAttribute(
1592       "xmlns",
1593       "http://www.microsoft.com/networking/WLAN/profile/v1");
1594   xml_writer.WriteElement("name", network_properties.guid);
1595   xml_writer.StartElement("SSIDConfig");
1596   xml_writer.StartElement("SSID");
1597   xml_writer.WriteElement("name", network_properties.ssid);
1598   xml_writer.EndElement();  // Ends "SSID" element.
1599   xml_writer.EndElement();  // Ends "SSIDConfig" element.
1600   xml_writer.WriteElement("connectionType", "ESS");
1601   xml_writer.WriteElement("connectionMode", "manual");
1602   xml_writer.StartElement("MSM");
1603   xml_writer.StartElement("security");
1604   xml_writer.StartElement("authEncryption");
1605   xml_writer.WriteElement("authentication", authentication);
1606   xml_writer.WriteElement("encryption", encryption);
1607   xml_writer.WriteElement("useOneX", "false");
1608   xml_writer.EndElement();  // Ends "authEncryption" element.
1609   if (!key_type.empty()) {
1610     xml_writer.StartElement("sharedKey");
1611     xml_writer.WriteElement("keyType", key_type);
1612     xml_writer.WriteElement("protected", "false");
1613     xml_writer.WriteElement("keyMaterial", network_properties.password);
1614     xml_writer.EndElement();  // Ends "sharedKey" element.
1615   }
1616   xml_writer.EndElement();  // Ends "security" element.
1617   xml_writer.EndElement();  // Ends "MSM" element.
1618   xml_writer.EndElement();  // Ends "WLANProfile" element.
1619   xml_writer.StopWriting();
1620   *profile_xml = xml_writer.GetWrittenString();
1621
1622   return true;
1623 }
1624
1625 void WiFiServiceImpl::NotifyNetworkListChanged(const NetworkList& networks) {
1626   if (network_list_changed_observer_.is_null())
1627     return;
1628
1629   NetworkGuidList current_networks;
1630   for (NetworkList::const_iterator it = networks.begin();
1631        it != networks.end();
1632        ++it) {
1633     current_networks.push_back(it->guid);
1634   }
1635
1636   message_loop_proxy_->PostTask(
1637       FROM_HERE,
1638       base::Bind(network_list_changed_observer_, current_networks));
1639 }
1640
1641 void WiFiServiceImpl::NotifyNetworkChanged(const std::string& network_guid) {
1642   if (enable_notify_network_changed_ && !networks_changed_observer_.is_null()) {
1643     DVLOG(1) << "NotifyNetworkChanged: " << network_guid;
1644     NetworkGuidList changed_networks(1, network_guid);
1645     message_loop_proxy_->PostTask(
1646         FROM_HERE,
1647         base::Bind(networks_changed_observer_, changed_networks));
1648   }
1649 }
1650
1651 WiFiService* WiFiService::Create() { return new WiFiServiceImpl(); }
1652
1653 }  // namespace wifi