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Diffstat (limited to '')
| -rw-r--r-- | netwerk/wifi/win/WinWifiScanner.cpp | 170 |
1 files changed, 170 insertions, 0 deletions
diff --git a/netwerk/wifi/win/WinWifiScanner.cpp b/netwerk/wifi/win/WinWifiScanner.cpp new file mode 100644 index 0000000000..b24fb4a2f1 --- /dev/null +++ b/netwerk/wifi/win/WinWifiScanner.cpp @@ -0,0 +1,170 @@ +/* This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ + +#include "nsWifiAccessPoint.h" +#include "WinWifiScanner.h" + +#define DOT11_BSS_TYPE_UNUSED static_cast<DOT11_BSS_TYPE>(0) + +namespace mozilla { + +class InterfaceScanCallbackData { + public: + explicit InterfaceScanCallbackData(uint32_t numInterfaces) + : mCurrentlyScanningInterfaces(numInterfaces) { + mAllInterfacesDoneScanningEvent = + ::CreateEventW(nullptr, // null security + TRUE, // manual reset event + FALSE, // initially nonsignaled + nullptr); // not named + MOZ_ASSERT(NULL != mAllInterfacesDoneScanningEvent); + } + + ~InterfaceScanCallbackData() { + ::CloseHandle(mAllInterfacesDoneScanningEvent); + } + + void OnInterfaceScanComplete() { + uint32_t val = ::InterlockedDecrement(&mCurrentlyScanningInterfaces); + if (!val) { + ::SetEvent(mAllInterfacesDoneScanningEvent); + } + } + + void WaitForAllInterfacesToFinishScanning(uint32_t msToWait) { + ::WaitForSingleObject(mAllInterfacesDoneScanningEvent, msToWait); + } + + private: + volatile uint32_t mCurrentlyScanningInterfaces; + HANDLE mAllInterfacesDoneScanningEvent; +}; + +static void WINAPI OnScanComplete(PWLAN_NOTIFICATION_DATA data, PVOID context) { + if (WLAN_NOTIFICATION_SOURCE_ACM != data->NotificationSource) { + return; + } + + if (wlan_notification_acm_scan_complete != data->NotificationCode && + wlan_notification_acm_scan_fail != data->NotificationCode) { + return; + } + + InterfaceScanCallbackData* cbData = + reinterpret_cast<InterfaceScanCallbackData*>(context); + cbData->OnInterfaceScanComplete(); +} + +WifiScannerImpl::WifiScannerImpl() { + // NOTE: We assume that, if we were unable to load the WLAN library when + // we initially tried, we will not be able to load it in the future. + // Technically, on Windows XP SP2, a user could install the redistributable + // and make our assumption incorrect. We opt to avoid making a bunch of + // spurious LoadLibrary calls in the common case rather than load the + // WLAN API in the edge case. + mWlanLibrary.reset(WinWLANLibrary::Load()); + if (!mWlanLibrary) { + NS_WARNING("Could not initialize Windows Wi-Fi scanner"); + } +} + +WifiScannerImpl::~WifiScannerImpl() {} + +nsresult WifiScannerImpl::GetAccessPointsFromWLAN( + nsTArray<RefPtr<nsIWifiAccessPoint>>& accessPoints) { + accessPoints.Clear(); + + // NOTE: We do not try to load the WLAN library if we previously failed + // to load it. See the note in WifiScannerImpl constructor + if (!mWlanLibrary) { + return NS_ERROR_NOT_AVAILABLE; + } + + // Get the list of interfaces. WlanEnumInterfaces allocates interface_list. + WLAN_INTERFACE_INFO_LIST* interface_list = nullptr; + if (ERROR_SUCCESS != + (*mWlanLibrary->GetWlanEnumInterfacesPtr())(mWlanLibrary->GetWLANHandle(), + nullptr, &interface_list)) { + return NS_ERROR_FAILURE; + } + + // This ensures we call WlanFreeMemory on interface_list + ScopedWLANObject scopedInterfaceList(*mWlanLibrary, interface_list); + + if (!interface_list->dwNumberOfItems) { + return NS_OK; + } + + InterfaceScanCallbackData cbData(interface_list->dwNumberOfItems); + + DWORD wlanNotifySource; + if (ERROR_SUCCESS != (*mWlanLibrary->GetWlanRegisterNotificationPtr())( + mWlanLibrary->GetWLANHandle(), + WLAN_NOTIFICATION_SOURCE_ACM, TRUE, + (WLAN_NOTIFICATION_CALLBACK)OnScanComplete, &cbData, + NULL, &wlanNotifySource)) { + return NS_ERROR_FAILURE; + } + + // Go through the list of interfaces and call `WlanScan` on each + for (unsigned int i = 0; i < interface_list->dwNumberOfItems; ++i) { + if (ERROR_SUCCESS != (*mWlanLibrary->GetWlanScanPtr())( + mWlanLibrary->GetWLANHandle(), + &interface_list->InterfaceInfo[i].InterfaceGuid, + NULL, NULL, NULL)) { + cbData.OnInterfaceScanComplete(); + } + } + + // From the MSDN documentation: + // "Wireless network drivers that meet Windows logo requirements are + // required to complete a WlanScan function request in 4 seconds" + cbData.WaitForAllInterfacesToFinishScanning(5000); + + // Unregister for the notifications. The documentation mentions that, + // if a callback is currently running, this will wait for the callback + // to complete. + (*mWlanLibrary->GetWlanRegisterNotificationPtr())( + mWlanLibrary->GetWLANHandle(), WLAN_NOTIFICATION_SOURCE_NONE, TRUE, NULL, + NULL, NULL, &wlanNotifySource); + + // Go through the list of interfaces and get the data for each. + for (uint32_t i = 0; i < interface_list->dwNumberOfItems; ++i) { + WLAN_BSS_LIST* bss_list; + if (ERROR_SUCCESS != (*mWlanLibrary->GetWlanGetNetworkBssListPtr())( + mWlanLibrary->GetWLANHandle(), + &interface_list->InterfaceInfo[i].InterfaceGuid, + nullptr, // Use all SSIDs. + DOT11_BSS_TYPE_UNUSED, + false, // bSecurityEnabled - + // unused + nullptr, // reserved + &bss_list)) { + continue; + } + + // This ensures we call WlanFreeMemory on bss_list + ScopedWLANObject scopedBssList(*mWlanLibrary, bss_list); + + // Store each discovered access point in our outparam + for (int j = 0; j < static_cast<int>(bss_list->dwNumberOfItems); ++j) { + nsWifiAccessPoint* ap = new nsWifiAccessPoint(); + if (!ap) { + continue; + } + + const WLAN_BSS_ENTRY bss_entry = bss_list->wlanBssEntries[j]; + ap->setMac(bss_entry.dot11Bssid); + ap->setSignal(bss_entry.lRssi); + ap->setSSID(reinterpret_cast<char const*>(bss_entry.dot11Ssid.ucSSID), + bss_entry.dot11Ssid.uSSIDLength); + + accessPoints.AppendElement(ap); + } + } + + return NS_OK; +} + +} // namespace mozilla |