DXR is a code search and navigation tool aimed at making sense of large projects. It supports full-text and regex searches as well as structural queries.

Line Code
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165
/* ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is Geolocation.
 *
 * The Initial Developer of the Original Code is Mozilla Foundation
 * Portions created by the Initial Developer are Copyright (C) 2008
 * the Initial Developer. All Rights Reserved.
 *
 * This is a derivative of work done by Google under a BSD style License.
 * See: http://gears.googlecode.com/svn/trunk/gears/geolocation/
 *
 * Contributor(s):
 *  Doug Turner <dougt@meer.net>  (Original Author)
 *  Nino D'Aversa <ninodaversa@gmail.com>
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either the GNU General Public License Version 2 or later (the "GPL"), or
 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
 * of those above. If you wish to allow use of your version of this file only
 * under the terms of either the GPL or the LGPL, and not to allow others to
 * use your version of this file under the terms of the MPL, indicate your
 * decision by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL or the LGPL. If you do not delete
 * the provisions above, a recipient may use your version of this file under
 * the terms of any one of the MPL, the GPL or the LGPL.
 *
 * ***** END LICENSE BLOCK ***** */


#include "windows.h"
#include "wlanapi.h"

#include "stdlib.h"

#include "nsWifiMonitor.h"
#include "nsWifiAccessPoint.h"

#include "nsServiceManagerUtils.h"
#include "nsComponentManagerUtils.h"
#include "nsIMutableArray.h"

using namespace mozilla;

nsresult
nsWifiMonitor::DoScan()
{
    HINSTANCE wlan_library = LoadLibrary("Wlanapi.dll");
    if (!wlan_library)
      return NS_ERROR_NOT_AVAILABLE;

    WlanOpenHandleFunction WlanOpenHandle = (WlanOpenHandleFunction) GetProcAddress(wlan_library, "WlanOpenHandle");
    WlanEnumInterfacesFunction WlanEnumInterfaces = (WlanEnumInterfacesFunction) GetProcAddress(wlan_library, "WlanEnumInterfaces");
    WlanGetNetworkBssListFunction WlanGetNetworkBssList = (WlanGetNetworkBssListFunction) GetProcAddress(wlan_library, "WlanGetNetworkBssList");
    WlanFreeMemoryFunction WlanFreeMemory = (WlanFreeMemoryFunction) GetProcAddress(wlan_library, "WlanFreeMemory");
    WlanCloseHandleFunction WlanCloseHandle = (WlanCloseHandleFunction) GetProcAddress(wlan_library, "WlanCloseHandle");

    if (!WlanOpenHandle ||
        !WlanEnumInterfaces ||
        !WlanGetNetworkBssList ||
        !WlanFreeMemory ||
        !WlanCloseHandle)
      return NS_ERROR_FAILURE;

    // Regularly get the access point data.

    nsCOMArray<nsWifiAccessPoint> lastAccessPoints;
    nsCOMArray<nsWifiAccessPoint> accessPoints;

    do {
      accessPoints.Clear();

      // Get the handle to the WLAN API.
      DWORD negotiated_version;
      HANDLE wlan_handle = NULL;
      // We could be executing on either Windows XP or Windows Vista, so use the
      // lower version of the client WLAN API. It seems that the negotiated version
      // is the Vista version irrespective of what we pass!
      static const int kXpWlanClientVersion = 1;
      if ((*WlanOpenHandle)(kXpWlanClientVersion,
                            NULL,
                            &negotiated_version,
                            &wlan_handle) != ERROR_SUCCESS) {
        return NS_ERROR_NOT_AVAILABLE;
      }

      // try again later.
      if (!wlan_handle)
        return NS_ERROR_FAILURE;

      // Get the list of interfaces. WlanEnumInterfaces allocates interface_list.
      WLAN_INTERFACE_INFO_LIST *interface_list = NULL;
      if ((*WlanEnumInterfaces)(wlan_handle, NULL, &interface_list) != ERROR_SUCCESS) {
        // try again later
        (*WlanCloseHandle)(wlan_handle, NULL);
        return NS_ERROR_FAILURE;
      }

      // Go through the list of interfaces and get the data for each.
      for (int i = 0; i < static_cast<int>(interface_list->dwNumberOfItems); ++i) {

        WLAN_BSS_LIST *bss_list;
        HRESULT rv = (*WlanGetNetworkBssList)(wlan_handle,
                                              &interface_list->InterfaceInfo[i].InterfaceGuid,
                                              NULL,   // Use all SSIDs.
                                              DOT11_BSS_TYPE_UNUSED,
                                              false,  // bSecurityEnabled - unused
                                              NULL,   // reserved
                                              &bss_list);
        if (rv != ERROR_SUCCESS) {
          continue;
        }

        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((char*) bss_entry.dot11Ssid.ucSSID,
                      bss_entry.dot11Ssid.uSSIDLength);

          accessPoints.AppendObject(ap);
        }
        (*WlanFreeMemory)(bss_list);
      }

      // Free interface_list.
      (*WlanFreeMemory)(interface_list);

      // Close the handle.
      (*WlanCloseHandle)(wlan_handle, NULL);


      bool accessPointsChanged = !AccessPointsEqual(accessPoints, lastAccessPoints);
      ReplaceArray(lastAccessPoints, accessPoints);

      nsresult rv = CallWifiListeners(lastAccessPoints, accessPointsChanged);
      NS_ENSURE_SUCCESS(rv, rv);

      // wait for some reasonable amount of time.  pref?
      LOG(("waiting on monitor\n"));

      ReentrantMonitorAutoEnter mon(mReentrantMonitor);
      mon.Wait(PR_SecondsToInterval(60));
    }
    while (mKeepGoing);

    return NS_OK;
}