Base infrastructure for Networking Private API on Windows and Mac.

chrome/utility/wifi/wifi_service_win.cc

+// Copyright 2013 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 "chrome/utility/wifi/wifi_service.h"
+
+#include <iphlpapi.h>
+#include <objbase.h>
+#include <wlanapi.h>
+
+#include "base/bind.h"
+#include "base/memory/ref_counted.h"
+#include "base/message_loop/message_loop.h"
+#include "base/strings/string16.h"
+#include "base/strings/string_util.h"
+#include "base/strings/utf_string_conversions.h"
+
+#pragma comment(lib, "wlanapi.lib")
+
+namespace wifi {
+
+// Implementation of WiFiService for Windows.
+class WiFiServiceImpl : public WiFiService, base::NonThreadSafe {
+ public:
+  WiFiServiceImpl();
+  virtual ~WiFiServiceImpl();
+
+  // WiFiService interface implementation.
+
+  virtual void GetProperties(const std::string& network_guid,
+                             const NetworkPropertiesCallback& callback,
+                             const ErrorCallback& error_callback) OVERRIDE;
+
+  virtual void GetState(const std::string& network_guid,
+                        const NetworkPropertiesCallback& callback,
+                        const ErrorCallback& error_callback) OVERRIDE;
+
+  virtual void GetManagedProperties(
+      const std::string& network_guid,
+      const DictionaryResultCallback& callback,
+      const ErrorCallback& error_callback) OVERRIDE;
+
+  virtual void SetProperties(const std::string& network_guid,
+                             const base::DictionaryValue& properties,
+                             const StringResultCallback& callback,
+                             const ErrorCallback& error_callback) OVERRIDE;
+
+  virtual void GetVisibleNetworks(
+      const NetworkListCallback& callback,
+      const ErrorCallback& error_callback) OVERRIDE;
+
+  virtual void RequestNetworkScan() OVERRIDE;
+
+  virtual void StartConnect(const std::string& network_guid,
+                            const StringResultCallback& callback,
+                            const ErrorCallback& error_callback) OVERRIDE;
+
+  virtual void StartDisconnect(const std::string& network_guid,
+                               const StringResultCallback& callback,
+                               const ErrorCallback& error_callback) OVERRIDE;
+
+  virtual void SetNetworksChangedObserver(
+      const NetworkGuidListCallback& observer) OVERRIDE;
+
+  virtual void SetNetworkListChangedObserver(
+      const NetworkGuidListCallback& observer) OVERRIDE;
+
+ private:
+  // Static callback for Windows WLAN_NOTIFICATION. Calls OnWlanNotification
+  // on WiFiServiceImpl passed back as |context|.
+  static void __stdcall OnWlanNotificationCallback(
+      PWLAN_NOTIFICATION_DATA wlan_notification_data,
+      PVOID context);
+
+  // Callback for Windows WLAN_NOTIFICATION. Called on random thread from
+  // OnWlanNotificationCallback. Handles network connectivity and scan complete
+  // notification and posts tasks to main thread.
+  void OnWlanNotification(PWLAN_NOTIFICATION_DATA wlan_notification_data);
+
+  // Handles NetworkScanComplete notification on main thread. Sends
+  // |NetworkListChanged| event with new list of visible networks.
+  void OnNetworkScanCompleteOnMainThread();
+
+  // Wait up to |kMaxAttempts| with |kAttemptDelayMs| delay for connection
+  // to network with |network_guid|. Reset DHCP and Notify that |NetworkChanged|
+  // upon success.
+  void WaitForNetworkConnect(const std::string& network_guid, int attempt);
+
+  // Check |error_code| and if is not |ERROR_SUCCESS|, then run |error_callback|
+  // with |error_name|.
+  bool CheckError(const ErrorCallback& error_callback,
+                  const std::string& error_name,
+                  DWORD error_code) const;
+
+  // Return |iterator| to network identified by |network_guid| in |networks|
+  // list.
+  NetworkList::const_iterator FindNetwork(
+      const NetworkList& networks,
+      const std::string& network_guid) const;
+
+  // Save currently connected network profile and return its
+  // |connected_network_guid|, so it can be re-connected later.
+  DWORD SaveCurrentConnectedNetwork(std::string* connected_network_guid);
+
+  // Sort networks, so connected/connecting is up front, then by type:
+  // Ethernet, WiFi, Cellular, VPN
+  static void SortNetworks(NetworkList* networks);
+
+  // Open a WLAN client handle, register for WLAN notifications.
+  DWORD OpenClientHandle();
+
+  // Reset DHCP on wireless adapter to speed up reconnect after chromecast
+  // device reset
+  DWORD ResetDHCP();
+
+  // Find |adapter_index_map| by |interface_guid| for DHCP reset.
+  DWORD FindAdapterIndexMapByGuid(const GUID& interface_guid,
+                                  IP_ADAPTER_INDEX_MAP* adapter_index_map);
+
+  // Ensure that |client_| handle is initialized.
+  DWORD EnsureInitialized();
+
+  // Close |client_| handle if it is open.
+  DWORD CloseClientHandle();
+
+  // Get |profile_name| from unique |network_guid|.
+  base::string16 ProfileNameFromGuid(const std::string& network_guid) const {
+    return base::UTF8ToUTF16(network_guid);
+  }
+
+  // Get |dot11Ssid| from unique |network_guid|.
+  DOT11_SSID SsidFromGuid(const std::string& network_guid) const;
+
+  // Get unique |network_guid| string based on |dot11Ssid|.
+  std::string GuidFromSsid(const DOT11_SSID& dot11Ssid) const {
+    return std::string(reinterpret_cast<const char*>(dot11Ssid.ucSSID),
+                       dot11Ssid.uSSIDLength);
+  }
+
+  // Get network |ssid| string based on |wlan|.
+  std::string SsidFromWlan(const WLAN_AVAILABLE_NETWORK& wlan) const {
+    return GuidFromSsid(wlan.dot11Ssid);
+  }
+
+  // Get unique |network_guid| string based on |wlan|.
+  std::string GuidFromWlan(const WLAN_AVAILABLE_NETWORK& wlan) const {
+    return SsidFromWlan(wlan);
+  }
+
+  // Deduce |WiFiService::Security| from |alg|.
+  WiFiService::Security SecurityFromDot11AuthAlg(
+      DOT11_AUTH_ALGORITHM alg) const;
+
+  // Populate |properties| based on |wlan| and its corresponding bss info from
+  // |wlan_bss_list|.
+  void NetworkPropertiesFromAvailableNetwork(const WLAN_AVAILABLE_NETWORK& wlan,
+                                             const WLAN_BSS_LIST& wlan_bss_list,
+                                             NetworkProperties* properties);
+  // Get the list of visible wireless networks.
+  DWORD GetVisibleNetworkList(NetworkList* network_list);
+
+  // Find currently connected network if any. Populate |connected_network_guid|
+  // on success.
+  DWORD FindConnectedNetwork(std::string* connected_network_guid);
+
+  // Connect to network |network_guid| using previosly stored profile if exists,
+  // or just network sid.
+  DWORD Connect(const std::string& network_guid);
+
+  // Disconnect from currently connected network if any.
+  DWORD Disconnect();
+
+  // Save temporary wireless profile for |network_guid|.
+  DWORD SaveTempProfile(const std::string& network_guid);
+
+  // Get previously stored |profile_xml| for |network_guid|.
+  DWORD GetProfile(const std::string& network_guid, std::string* profile_xml);
+
+  // Return true if there is previously stored profile xml for |network_guid|.
+  bool HaveProfile(const std::string& network_guid);
+
+  // Notify |network_list_changed_observer_| that list of visible networks has
+  // changed to |networks|.
+  void NotifyNetworkListChanged(const NetworkList& networks);
+
+  // Notify |networks_changed_observer_| that network |network_guid| status has
+  // changed.
+  void NotifyNetworkChanged(const std::string& network_guid);
+
+  // Wlan Service Handle.
+  HANDLE client_;
+  // Wlan Interface Guid.
+  GUID interface_guid_;
+  // Preserved Wlan Profile Xml.
+  std::map<std::string, std::string> saved_profiles_xml_;
+  // Observer to get notified when network(s) have changed (e.g. connect).
+  NetworkGuidListCallback networks_changed_observer_;
+  // Observer to get notified when network list has changed (scan complete).
+  NetworkGuidListCallback network_list_changed_observer_;
+  // Task runner to post tasks on main thread.
+  scoped_refptr<base::TaskRunner> task_runner_;
+  // Number of attempts to check that network has connected successfully.
+  static const int kMaxAttempts = 100;
+  // Delay between attempts to check that network has connected successfully.
+  static const int kAttemptDelayMs = 100;
+  // Delay after DHCP Renew to allow IP address to be acquired.
+  static const int kDhcpRenewDelayMs = 3000;
+
+  DISALLOW_COPY_AND_ASSIGN(WiFiServiceImpl);
+};
+
+WiFiServiceImpl::WiFiServiceImpl() : client_(NULL) {}
+
+WiFiServiceImpl::~WiFiServiceImpl() { CloseClientHandle(); }
+
+void WiFiServiceImpl::GetProperties(const std::string& network_guid,
+                                    const NetworkPropertiesCallback& callback,
+                                    const ErrorCallback& error_callback) {
+  DWORD error = EnsureInitialized();
+
+  if (error == ERROR_SUCCESS) {
+    NetworkList network_list;
+    error = GetVisibleNetworkList(&network_list);
+    if (error == ERROR_SUCCESS && !network_list.empty()) {
+      NetworkList::const_iterator it = FindNetwork(network_list, network_guid);
+      if (it != network_list.end())
+        callback.Run(network_guid, *it);
+      else
+        error = ERROR_NOT_FOUND;
+    }
+  }
+
+  CheckError(error_callback, "Error.DBusFailed", error);
+}
+
+void WiFiServiceImpl::GetState(const std::string& network_guid,
+                               const NetworkPropertiesCallback& callback,
+                               const ErrorCallback& error_callback) {}
+
+void WiFiServiceImpl::GetManagedProperties(
+    const std::string& network_guid,
+    const DictionaryResultCallback& callback,
+    const ErrorCallback& error_callback) {}
+
+void WiFiServiceImpl::SetProperties(const std::string& network_guid,
+                                    const base::DictionaryValue& properties,
+                                    const StringResultCallback& callback,
+                                    const ErrorCallback& error_callback) {}
+
+void WiFiServiceImpl::GetVisibleNetworks(
+    const NetworkListCallback& callback,
+    const ErrorCallback& error_callback) {
+  DWORD error = EnsureInitialized();
+
+  if (error == ERROR_SUCCESS) {
+    NetworkList network_list;
+    error = GetVisibleNetworkList(&network_list);
+    if (error == ERROR_SUCCESS && !network_list.empty()) {
+      SortNetworks(&network_list);
+      callback.Run(network_list);
+    }
+  }
+
+  CheckError(error_callback, "Error.DBusFailed", error);
+}
+
+void WiFiServiceImpl::RequestNetworkScan() {
+  DWORD error = EnsureInitialized();
+  if (error == ERROR_SUCCESS) {
+    WlanScan(client_, &interface_guid_, NULL, NULL, NULL);
+  }
+}
+
+void WiFiServiceImpl::StartConnect(
+    const std::string& network_guid,
+    const StringResultCallback& callback,
+    const ErrorCallback& error_callback) {
+  DWORD error = EnsureInitialized();
+  if (error == ERROR_SUCCESS) {
+    std::string connected_network_guid;
+    error = SaveCurrentConnectedNetwork(&connected_network_guid);
+    if (error == ERROR_SUCCESS) {
+      error = Connect(network_guid);
+      if (error == ERROR_SUCCESS) {
+        callback.Run(network_guid);
+        // Notify that previously connected network has changed.
+        NotifyNetworkChanged(connected_network_guid);
+        // Start waiting for network connection state change.
+        if (!networks_changed_observer_.is_null())
+          WaitForNetworkConnect(network_guid, 0);
+      }
+    }
+  }
+  CheckError(error_callback, "Error.DBusFailed", error);
+}
+
+void WiFiServiceImpl::StartDisconnect(
+    const std::string& network_guid,
+    const StringResultCallback& callback,
+    const ErrorCallback& error_callback) {
+  DWORD error = EnsureInitialized();
+
+  if (error == ERROR_SUCCESS) {
+    std::string connected_network_guid;
+    error = SaveCurrentConnectedNetwork(&connected_network_guid);
+    if (error == ERROR_SUCCESS && network_guid == connected_network_guid) {
+      error = Disconnect();
+      if (error == ERROR_SUCCESS) {
+        callback.Run(network_guid);
+      }
+    }
+  }
+  CheckError(error_callback, "Error.DBusFailed", error);
+}
+
+void WiFiServiceImpl::SetNetworksChangedObserver(
+    const NetworkGuidListCallback& observer) {
+  networks_changed_observer_ = observer;
+}
+
+void WiFiServiceImpl::SetNetworkListChangedObserver(
+    const NetworkGuidListCallback& observer) {
+  network_list_changed_observer_ = observer;
+}
+
+void WiFiServiceImpl::OnWlanNotificationCallback(
+    PWLAN_NOTIFICATION_DATA wlan_notification_data,
+    PVOID context) {
+  WiFiServiceImpl* service = reinterpret_cast<WiFiServiceImpl*>(context);
+  service->OnWlanNotification(wlan_notification_data);
+}
+
+void WiFiServiceImpl::OnWlanNotification(
+    PWLAN_NOTIFICATION_DATA wlan_notification_data) {
+  PWLAN_CONNECTION_NOTIFICATION_DATA wlan_connection_data =
+      reinterpret_cast<PWLAN_CONNECTION_NOTIFICATION_DATA>(
+          wlan_notification_data->pData);
+
+  switch (wlan_notification_data->NotificationCode) {
+    case wlan_notification_acm_disconnected:
+    case wlan_notification_acm_connection_complete:
+    case wlan_notification_acm_connection_attempt_fail:
+      task_runner_->PostTask(
+          FROM_HERE,
+          base::Bind(&WiFiServiceImpl::NotifyNetworkChanged,
+                     base::Unretained(this),
+                     GuidFromSsid(wlan_connection_data->dot11Ssid)));
+      break;
+    case wlan_notification_acm_scan_complete:
+      task_runner_->PostTask(
+          FROM_HERE,
+          base::Bind(&WiFiServiceImpl::OnNetworkScanCompleteOnMainThread,
+                     base::Unretained(this)));
+      break;
+  }
+}
+
+void WiFiServiceImpl::OnNetworkScanCompleteOnMainThread() {
+  NetworkList networks;
+  DWORD error = GetVisibleNetworkList(&networks);
+  if (error == ERROR_SUCCESS)
+    NotifyNetworkListChanged(networks);
+}
+
+void WiFiServiceImpl::WaitForNetworkConnect(const std::string& network_guid,
+                                            int attempt) {
+  if (attempt > kMaxAttempts)
+    return;
+
+  std::string connected_network_guid;
+  DWORD error = FindConnectedNetwork(&connected_network_guid);
+  if (network_guid == connected_network_guid) {
+    // Reset DHCP to speed up the connection after Chromekey factory reset.
+    error = ResetDHCP();
+    if (error == ERROR_SUCCESS) {
+      base::MessageLoop::current()->PostDelayedTask(
+          FROM_HERE,
+          base::Bind(&WiFiServiceImpl::NotifyNetworkChanged,
+                     base::Unretained(this),
+                     network_guid),
+          base::TimeDelta::FromMilliseconds(kDhcpRenewDelayMs));
+    } else {
+      NotifyNetworkChanged(network_guid);
+    }
+  } else {
+    // Continue waiting for network connection state change.
+    base::MessageLoop::current()->PostDelayedTask(
+        FROM_HERE,
+        base::Bind(&WiFiServiceImpl::WaitForNetworkConnect,
+                   base::Unretained(this),
+                   network_guid,
+                   ++attempt),
+        base::TimeDelta::FromMilliseconds(kAttemptDelayMs));
+  }
+}
+
+bool WiFiServiceImpl::CheckError(const ErrorCallback& error_callback,
+                                 const std::string& error_name,
+                                 DWORD error_code) const {
+  if (error_code != ERROR_SUCCESS) {
+    scoped_ptr<base::DictionaryValue> error_data(new base::DictionaryValue);
+    error_data->SetInteger("Win32ErrorCode", error_code);
+    error_callback.Run(error_name, error_data.Pass());
+    return true;
+  }
+  return false;
+}
+
+WiFiService::NetworkList::const_iterator WiFiServiceImpl::FindNetwork(
+    const WiFiService::NetworkList& networks,
+    const std::string& network_guid) const {
+  for (NetworkList::const_iterator it = networks.begin(); it != networks.end();
+       ++it) {
+    if (it->guid == network_guid)
+      return it;
+  }
+  return networks.end();
+}
+
+DWORD WiFiServiceImpl::SaveCurrentConnectedNetwork(
+    std::string* connected_network_guid) {
+  // Find currently connected network.
+  DWORD error = FindConnectedNetwork(connected_network_guid);
+  if (error == ERROR_SUCCESS && !connected_network_guid->empty()) {
+    if (error == ERROR_SUCCESS) {
+      SaveTempProfile(*connected_network_guid);
+      std::string profile_xml;
+      error = GetProfile(*connected_network_guid, &profile_xml);
+      if (error == ERROR_SUCCESS) {
+        saved_profiles_xml_[*connected_network_guid] = profile_xml;
+      }
+    }
+  }
+  return error;
+}
+
+void WiFiServiceImpl::SortNetworks(NetworkList* networks) {
+  networks->sort(WiFiService::NetworkProperties::OrderByType);
+}
+
+DWORD WiFiServiceImpl::OpenClientHandle() {
+  CloseClientHandle();
+
+  DWORD error = ERROR_SUCCESS;
+  DWORD service_version = 0;
+
+  // Open a handle to the service.
+  error = WlanOpenHandle(WLAN_API_VERSION, NULL, &service_version, &client_);
+
+  PWLAN_INTERFACE_INFO_LIST pIntfList = NULL;
+  if (error == ERROR_SUCCESS) {
+    // Enumerate wireless interfaces.
+    error = WlanEnumInterfaces(client_, NULL, &pIntfList);
+    if (error == ERROR_SUCCESS) {
+      if (pIntfList != NULL && pIntfList->dwNumberOfItems != 0) {
+        // Remember first interface.
+        interface_guid_ = pIntfList->InterfaceInfo[0].InterfaceGuid;
+        // Try to find connected interface.
+        for (DWORD itf = 0; itf < pIntfList->dwNumberOfItems; ++itf) {
+          if (pIntfList->InterfaceInfo[itf].isState ==
+              wlan_interface_state_connected) {
+            // Found connected interface, remember it!
+            interface_guid_ = pIntfList->InterfaceInfo[itf].InterfaceGuid;
+            break;
+          }
+        }
+        WlanRegisterNotification(client_,
+                                 WLAN_NOTIFICATION_SOURCE_ALL,
+                                 FALSE,
+                                 OnWlanNotificationCallback,
+                                 this,
+                                 NULL,
+                                 NULL);
+      } else {
+        error = ERROR_NOINTERFACE;
+      }
+    }
+    // Clean up.
+    if (pIntfList != NULL)
+      WlanFreeMemory(pIntfList);
+  }
+  return error;
+}
+
+DWORD WiFiServiceImpl::ResetDHCP() {
+  IP_ADAPTER_INDEX_MAP adapter_index_map = {0};
+  DWORD error =
+      FindAdapterIndexMapByGuid(interface_guid_, &adapter_index_map);
+  if (error == ERROR_SUCCESS) {
+    error = IpReleaseAddress(&adapter_index_map);
+    if (error == ERROR_SUCCESS) {
+      error = IpRenewAddress(&adapter_index_map);
+    }
+  }
+  return error;
+}
+
+DWORD WiFiServiceImpl::FindAdapterIndexMapByGuid(
+    const GUID& interface_guid,
+    IP_ADAPTER_INDEX_MAP* adapter_index_map) {
+  string16 guid_string;
+  const int kGUIDSize = 39;
+  ::StringFromGUID2(
+      interface_guid, WriteInto(&guid_string, kGUIDSize), kGUIDSize);
+
+  ULONG buffer_length = 0;
+  DWORD error = GetInterfaceInfo(NULL, &buffer_length);
+  if (error == ERROR_INSUFFICIENT_BUFFER) {
+    scoped_ptr<unsigned char[]> buffer(new unsigned char[buffer_length]);
+    IP_INTERFACE_INFO* interface_info =
+        reinterpret_cast<IP_INTERFACE_INFO*>(buffer.get());
+    error = GetInterfaceInfo(interface_info, &buffer_length);
+    if (error == ERROR_SUCCESS) {
+      for (long adapter = 0; adapter < interface_info->NumAdapters; ++adapter) {
+        if (EndsWith(
+                interface_info->Adapter[adapter].Name, guid_string, false)) {
+          *adapter_index_map = interface_info->Adapter[adapter];
+          break;
+        }
+      }
+    }
+  }
+  return error;
+}
+
+DWORD WiFiServiceImpl::EnsureInitialized() {
+  DCHECK(CalledOnValidThread());
+  if (task_runner_.get() == NULL)
+    task_runner_ = base::MessageLoopProxy::current();
+
+  if (client_ != NULL)
+    return ERROR_SUCCESS;
+  return OpenClientHandle();
+}
+
+DWORD WiFiServiceImpl::CloseClientHandle() {
+  DWORD error = ERROR_SUCCESS;
+  if (client_ != NULL) {
+    WlanCloseHandle(client_, NULL);
+    client_ = NULL;
+  }
+  return error;
+}
+
+DOT11_SSID WiFiServiceImpl::SsidFromGuid(
+    const std::string& network_guid) const {
+  DOT11_SSID ssid = {0};
+  if (network_guid.length() <= DOT11_SSID_MAX_LENGTH) {
+    ssid.uSSIDLength = network_guid.length();
+    strncpy(reinterpret_cast<char*>(ssid.ucSSID),
+            network_guid.c_str(),
+            ssid.uSSIDLength);
+  }
+  return ssid;
+}
+
+WiFiService::Security WiFiServiceImpl::SecurityFromDot11AuthAlg(
+    DOT11_AUTH_ALGORITHM alg) const {
+  // TODO(mef): Figure out correct mapping.
+  switch (alg) {
+    case DOT11_AUTH_ALGO_RSNA:
+      return kSecurityWPA;
+    case DOT11_AUTH_ALGO_RSNA_PSK:
+      return kSecurityWPA_PSK;
+    case DOT11_AUTH_ALGO_80211_SHARED_KEY:
+      return kSecurityWEP_PSK;
+    case DOT11_AUTH_ALGO_80211_OPEN:
+      return kSecurityNone;
+    default:
+      return kSecurityUnknown;
+  }
+  return kSecurityUnknown;
+}
+
+void WiFiServiceImpl::NetworkPropertiesFromAvailableNetwork(
+    const WLAN_AVAILABLE_NETWORK& wlan,
+    const WLAN_BSS_LIST& wlan_bss_list,
+    NetworkProperties* properties) {
+  if (wlan.dwFlags & WLAN_AVAILABLE_NETWORK_CONNECTED) {
+    properties->connection_state = WiFiService::kConnectionStateConnected;
+  } else {
+    properties->connection_state = WiFiService::kConnectionStateNotConnected;
+  }
+
+  properties->ssid = SsidFromWlan(wlan);
+  properties->name = properties->ssid;
+  properties->guid = GuidFromWlan(wlan);
+  properties->type = WiFiService::kNetworkTypeWiFi;
+
+  for (size_t bss = 0; bss < wlan_bss_list.dwNumberOfItems; ++bss) {
+    const WLAN_BSS_ENTRY& bss_entry(wlan_bss_list.wlanBssEntries[bss]);
+    if (bss_entry.dot11Ssid.uSSIDLength == wlan.dot11Ssid.uSSIDLength &&
+        0 == memcmp(bss_entry.dot11Ssid.ucSSID,
+                    wlan.dot11Ssid.ucSSID,
+                    bss_entry.dot11Ssid.uSSIDLength)) {
+      if (bss_entry.ulChCenterFrequency < 3000000)
+        properties->frequency = kFrequency2400;
+      else
+        properties->frequency = kFrequency5000;
+      properties->frequency_list.push_back(properties->frequency);
+      properties->bssid = WiFiService::NetworkProperties::MacAddressAsString(
+          bss_entry.dot11Bssid);
+    }
+  }
+  properties->frequency_list.sort();
+  properties->frequency_list.unique();
+  properties->security =
+      SecurityFromDot11AuthAlg(wlan.dot11DefaultAuthAlgorithm);
+  properties->signal_strength = wlan.wlanSignalQuality;
+}
+
+// Get the list of visible wireless networks
+DWORD WiFiServiceImpl::GetVisibleNetworkList(NetworkList* network_list) {
+  DWORD error = ERROR_SUCCESS;
+
+  if (client_ == NULL) {
+    return ERROR_NOINTERFACE;
+  }
+
+  PWLAN_AVAILABLE_NETWORK_LIST pVList = NULL;
+  PWLAN_BSS_LIST pWlanBssList = NULL;
+
+  error = WlanGetAvailableNetworkList(
+      client_, &interface_guid_, 0, NULL, &pVList);
+
+  if (error == ERROR_SUCCESS && NULL != pVList) {
+    error = WlanGetNetworkBssList(client_,
+                                  &interface_guid_,
+                                  NULL,
+                                  dot11_BSS_type_any,
+                                  FALSE,
+                                  NULL,
+                                  &pWlanBssList);
+    if (error == ERROR_SUCCESS && NULL != pWlanBssList) {
+      for (DWORD i = 0; i < pVList->dwNumberOfItems; ++i) {
+        network_list->push_back(NetworkProperties());
+        NetworkPropertiesFromAvailableNetwork(
+            pVList->Network[i], *pWlanBssList, &network_list->back());
+      }
+    }
+  }
+
+  // clean up
+  if (pVList != NULL) {
+    WlanFreeMemory(pVList);
+  }
+  if (pWlanBssList != NULL) {
+    WlanFreeMemory(pWlanBssList);
+  }
+  return error;
+}
+
+// Find currently connected network.
+DWORD WiFiServiceImpl::FindConnectedNetwork(
+    std::string* connected_network_guid) {
+  DWORD error = ERROR_SUCCESS;
+
+  if (client_ == NULL) {
+    return ERROR_NOINTERFACE;
+  }
+
+  PWLAN_AVAILABLE_NETWORK_LIST pVList = NULL;
+
+  error = WlanGetAvailableNetworkList(
+      client_, &interface_guid_, 0, NULL, &pVList);
+
+  if (error == ERROR_SUCCESS && NULL != pVList) {
+    for (DWORD i = 0; i < pVList->dwNumberOfItems; ++i) {
+      const WLAN_AVAILABLE_NETWORK& wlan = pVList->Network[i];
+      if (wlan.dwFlags & WLAN_AVAILABLE_NETWORK_CONNECTED) {
+        *connected_network_guid = GuidFromWlan(wlan);
+        break;
+      }
+    }
+  }
+
+  // clean up
+  if (pVList != NULL) {
+    WlanFreeMemory(pVList);
+  }
+
+  return error;
+}
+
+DWORD WiFiServiceImpl::Connect(const std::string& network_guid) {
+  DWORD error = ERROR_SUCCESS;
+
+  if (client_ == NULL) {
+    return ERROR_NOINTERFACE;
+  }
+
+  base::string16 profile_name = ProfileNameFromGuid(network_guid);
+
+  if (HaveProfile(network_guid)) {
+    WLAN_CONNECTION_PARAMETERS wlan_params = {
+        wlan_connection_mode_profile, profile_name.c_str(), NULL,
+        NULL,                         dot11_BSS_type_any,   0};
+    error = ::WlanConnect(client_, &interface_guid_, &wlan_params, NULL);
+  } else {
+    DOT11_SSID ssid = SsidFromGuid(network_guid);
+    WLAN_CONNECTION_PARAMETERS wlan_params = {
+        wlan_connection_mode_discovery_unsecure, NULL, &ssid, NULL,
+        dot11_BSS_type_infrastructure,           0};
+    error = ::WlanConnect(client_, &interface_guid_, &wlan_params, NULL);
+  }
+
+  return error;
+}
+
+DWORD WiFiServiceImpl::Disconnect() {
+  DWORD error = ERROR_SUCCESS;
+
+  if (client_ == NULL) {
+    return ERROR_NOINTERFACE;
+  }
+
+  error = ::WlanDisconnect(client_, &interface_guid_, NULL);
+  return error;
+}
+
+DWORD WiFiServiceImpl::SaveTempProfile(const std::string& network_guid) {
+  DWORD error = ERROR_SUCCESS;
+
+  if (client_ == NULL) {
+    return ERROR_NOINTERFACE;
+  }
+
+  base::string16 profile_name = ProfileNameFromGuid(network_guid);
+
+  error = ::WlanSaveTemporaryProfile(
+      client_, &interface_guid_, profile_name.c_str(), NULL, 0, true, NULL);
+  return error;
+}
+
+DWORD WiFiServiceImpl::GetProfile(const std::string& network_guid,
+                                  std::string* profile_xml) {
+  DWORD error = ERROR_SUCCESS;
+
+  if (client_ == NULL) {
+    return ERROR_NOINTERFACE;
+  }
+
+  base::string16 profile_name = ProfileNameFromGuid(network_guid);
+  LPWSTR str_profile_xml = NULL;
+  error = ::WlanGetProfile(client_,
+                           &interface_guid_,
+                           profile_name.c_str(),
+                           NULL,
+                           &str_profile_xml,
+                           NULL,
+                           NULL);
+
+  if (error == ERROR_SUCCESS && str_profile_xml != NULL) {
+    *profile_xml = base::UTF16ToUTF8(str_profile_xml);
+  }
+  // clean up
+  if (str_profile_xml != NULL) {
+    WlanFreeMemory(str_profile_xml);
+  }
+
+  return error;
+}
+
+bool WiFiServiceImpl::HaveProfile(const std::string& network_guid) {
+  DWORD error = ERROR_SUCCESS;
+  std::string profile_xml;
+  return GetProfile(network_guid, &profile_xml) == ERROR_SUCCESS;
+}
+
+void WiFiServiceImpl::NotifyNetworkListChanged(const NetworkList& networks) {
+  if (network_list_changed_observer_.is_null())
+    return;
+
+  WiFiService::NetworkGuidList current_networks;
+  for (WiFiService::NetworkList::const_iterator it = networks.begin();
+       it != networks.end();
+       ++it) {
+    current_networks.push_back(it->guid);
+  }
+  network_list_changed_observer_.Run(current_networks);
+}
+
+void WiFiServiceImpl::NotifyNetworkChanged(const std::string& network_guid) {
+  WiFiService::NetworkGuidList changed_networks(1, network_guid);
+  if (!networks_changed_observer_.is_null())
+    networks_changed_observer_.Run(changed_networks);
+}
+
+WiFiService* WiFiService::CreateService() { return new WiFiServiceImpl(); }
+
+}  // namespace wifi