net/base/network_interfaces_win.cc

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "net/base/net_util.h"
   6
   7 #include <iphlpapi.h>
   8 #include <wlanapi.h>
   9
  10 #include <algorithm>
  11
  12 #include "base/files/file_path.h"
  13 #include "base/lazy_instance.h"
  14 #include "base/memory/scoped_ptr.h"
  15 #include "base/profiler/scoped_tracker.h"
  16 #include "base/strings/string_piece.h"
  17 #include "base/strings/string_util.h"
  18 #include "base/strings/sys_string_conversions.h"
  19 #include "base/strings/utf_string_conversions.h"
  20 #include "base/threading/thread_restrictions.h"
  21 #include "base/win/scoped_handle.h"
  22 #include "base/win/windows_version.h"
  23 #include "net/base/escape.h"
  24 #include "net/base/ip_endpoint.h"
  25 #include "net/base/net_errors.h"
  26 #include "net/base/network_interfaces_win.h"
  27 #include "url/gurl.h"
  28
  29 namespace net {
  30
  31 namespace {
  32
  33 // Converts Windows defined types to NetworkInterfaceType.
  34 NetworkChangeNotifier::ConnectionType GetNetworkInterfaceType(DWORD ifType) {
  35   // Bail out for pre-Vista versions of Windows which are documented to give
  36   // inaccurate results like returning Ethernet for WiFi.
  37   // http://msdn.microsoft.com/en-us/library/windows/desktop/aa366058.aspx
  38   if (base::win::GetVersion() < base::win::VERSION_VISTA)
  39     return NetworkChangeNotifier::CONNECTION_UNKNOWN;
  40
  41   NetworkChangeNotifier::ConnectionType type =
  42       NetworkChangeNotifier::CONNECTION_UNKNOWN;
  43   if (ifType == IF_TYPE_ETHERNET_CSMACD) {
  44     type = NetworkChangeNotifier::CONNECTION_ETHERNET;
  45   } else if (ifType == IF_TYPE_IEEE80211) {
  46     type = NetworkChangeNotifier::CONNECTION_WIFI;
  47   }
  48   // TODO(mallinath) - Cellular?
  49   return type;
  50 }
  51
  52 }  // namespace
  53
  54 namespace internal {
  55
  56 base::LazyInstance<WlanApi>::Leaky lazy_wlanapi =
  57   LAZY_INSTANCE_INITIALIZER;
  58
  59 WlanApi& WlanApi::GetInstance() {
  60   return lazy_wlanapi.Get();
  61 }
  62
  63 WlanApi::WlanApi() : initialized(false) {
  64   // Use an absolute path to load the DLL to avoid DLL preloading attacks.
  65   static const wchar_t* const kDLL = L"%WINDIR%\\system32\\wlanapi.dll";
  66   wchar_t path[MAX_PATH] = {0};
  67   ExpandEnvironmentStrings(kDLL, path, arraysize(path));
  68   module = ::LoadLibraryEx(path, NULL, LOAD_WITH_ALTERED_SEARCH_PATH);
  69   if (!module)
  70     return;
  71
  72   open_handle_func = reinterpret_cast<WlanOpenHandleFunc>(
  73       ::GetProcAddress(module, "WlanOpenHandle"));
  74   enum_interfaces_func = reinterpret_cast<WlanEnumInterfacesFunc>(
  75       ::GetProcAddress(module, "WlanEnumInterfaces"));
  76   query_interface_func = reinterpret_cast<WlanQueryInterfaceFunc>(
  77       ::GetProcAddress(module, "WlanQueryInterface"));
  78   set_interface_func = reinterpret_cast<WlanSetInterfaceFunc>(
  79       ::GetProcAddress(module, "WlanSetInterface"));
  80   free_memory_func = reinterpret_cast<WlanFreeMemoryFunc>(
  81       ::GetProcAddress(module, "WlanFreeMemory"));
  82   close_handle_func = reinterpret_cast<WlanCloseHandleFunc>(
  83       ::GetProcAddress(module, "WlanCloseHandle"));
  84   initialized = open_handle_func && enum_interfaces_func &&
  85       query_interface_func && set_interface_func &&
  86       free_memory_func && close_handle_func;
  87 }
  88
  89 bool GetNetworkListImpl(NetworkInterfaceList* networks,
  90                         int policy,
  91                         bool is_xp,
  92                         const IP_ADAPTER_ADDRESSES* adapters) {
  93   for (const IP_ADAPTER_ADDRESSES* adapter = adapters; adapter != NULL;
  94        adapter = adapter->Next) {
  95     // Ignore the loopback device.
  96     if (adapter->IfType == IF_TYPE_SOFTWARE_LOOPBACK) {
  97       continue;
  98     }
  99
 100     if (adapter->OperStatus != IfOperStatusUp) {
 101       continue;
 102     }
 103
 104     // Ignore any HOST side vmware adapters with a description like:
 105     // VMware Virtual Ethernet Adapter for VMnet1
 106     // but don't ignore any GUEST side adapters with a description like:
 107     // VMware Accelerated AMD PCNet Adapter #2
 108     if ((policy & EXCLUDE_HOST_SCOPE_VIRTUAL_INTERFACES) &&
 109         strstr(adapter->AdapterName, "VMnet") != NULL) {
 110       continue;
 111     }
 112
 113     for (IP_ADAPTER_UNICAST_ADDRESS* address = adapter->FirstUnicastAddress;
 114          address; address = address->Next) {
 115       int family = address->Address.lpSockaddr->sa_family;
 116       if (family == AF_INET || family == AF_INET6) {
 117         IPEndPoint endpoint;
 118         if (endpoint.FromSockAddr(address->Address.lpSockaddr,
 119                                   address->Address.iSockaddrLength)) {
 120           // XP has no OnLinkPrefixLength field.
 121           size_t prefix_length = is_xp ? 0 : address->OnLinkPrefixLength;
 122           if (is_xp) {
 123             // Prior to Windows Vista the FirstPrefix pointed to the list with
 124             // single prefix for each IP address assigned to the adapter.
 125             // Order of FirstPrefix does not match order of FirstUnicastAddress,
 126             // so we need to find corresponding prefix.
 127             for (IP_ADAPTER_PREFIX* prefix = adapter->FirstPrefix; prefix;
 128                  prefix = prefix->Next) {
 129               int prefix_family = prefix->Address.lpSockaddr->sa_family;
 130               IPEndPoint network_endpoint;
 131               if (prefix_family == family &&
 132                   network_endpoint.FromSockAddr(prefix->Address.lpSockaddr,
 133                       prefix->Address.iSockaddrLength) &&
 134                   IPNumberMatchesPrefix(endpoint.address(),
 135                                         network_endpoint.address(),
 136                                         prefix->PrefixLength)) {
 137                 prefix_length =
 138                     std::max<size_t>(prefix_length, prefix->PrefixLength);
 139               }
 140             }
 141           }
 142
 143           // If the duplicate address detection (DAD) state is not changed to
 144           // Preferred, skip this address.
 145           if (address->DadState != IpDadStatePreferred) {
 146             continue;
 147           }
 148
 149           uint32_t index =
 150               (family == AF_INET) ? adapter->IfIndex : adapter->Ipv6IfIndex;
 151
 152           // From http://technet.microsoft.com/en-us/ff568768(v=vs.60).aspx, the
 153           // way to identify a temporary IPv6 Address is to check if
 154           // PrefixOrigin is equal to IpPrefixOriginRouterAdvertisement and
 155           // SuffixOrigin equal to IpSuffixOriginRandom.
 156           int ip_address_attributes = IP_ADDRESS_ATTRIBUTE_NONE;
 157           if (family == AF_INET6) {
 158             if (address->PrefixOrigin == IpPrefixOriginRouterAdvertisement &&
 159                 address->SuffixOrigin == IpSuffixOriginRandom) {
 160               ip_address_attributes |= IP_ADDRESS_ATTRIBUTE_TEMPORARY;
 161             }
 162             if (address->PreferredLifetime == 0) {
 163               ip_address_attributes |= IP_ADDRESS_ATTRIBUTE_DEPRECATED;
 164             }
 165           }
 166           networks->push_back(NetworkInterface(
 167               adapter->AdapterName,
 168               base::SysWideToNativeMB(adapter->FriendlyName), index,
 169               GetNetworkInterfaceType(adapter->IfType), endpoint.address(),
 170               prefix_length, ip_address_attributes));
 171         }
 172       }
 173     }
 174   }
 175   return true;
 176 }
 177
 178 }  // namespace internal
 179
 180 bool GetNetworkList(NetworkInterfaceList* networks, int policy) {
 181   bool is_xp = base::win::GetVersion() < base::win::VERSION_VISTA;
 182   ULONG len = 0;
 183   ULONG flags = is_xp ? GAA_FLAG_INCLUDE_PREFIX : 0;
 184   // GetAdaptersAddresses() may require IO operations.
 185   base::ThreadRestrictions::AssertIOAllowed();
 186   ULONG result = GetAdaptersAddresses(AF_UNSPEC, flags, NULL, NULL, &len);
 187   if (result != ERROR_BUFFER_OVERFLOW) {
 188     // There are 0 networks.
 189     return true;
 190   }
 191   scoped_ptr<char[]> buf(new char[len]);
 192   IP_ADAPTER_ADDRESSES* adapters =
 193       reinterpret_cast<IP_ADAPTER_ADDRESSES*>(buf.get());
 194   result = GetAdaptersAddresses(AF_UNSPEC, flags, NULL, adapters, &len);
 195   if (result != NO_ERROR) {
 196     LOG(ERROR) << "GetAdaptersAddresses failed: " << result;
 197     return false;
 198   }
 199
 200   return internal::GetNetworkListImpl(networks, policy, is_xp, adapters);
 201 }
 202
 203 WifiPHYLayerProtocol GetWifiPHYLayerProtocol() {
 204   const internal::WlanApi& wlanapi = internal::WlanApi::GetInstance();
 205   if (!wlanapi.initialized)
 206     return WIFI_PHY_LAYER_PROTOCOL_NONE;
 207
 208   internal::WlanHandle client;
 209   DWORD cur_version = 0;
 210   const DWORD kMaxClientVersion = 2;
 211   {
 212     // TODO(rtenneti): Remove ScopedTracker below once crbug.com/422516 is
 213     // fixed.
 214     tracked_objects::ScopedTracker tracking_profile(
 215         FROM_HERE_WITH_EXPLICIT_FUNCTION("422516 OpenHandle()"));
 216     DWORD result = wlanapi.OpenHandle(kMaxClientVersion, &cur_version, &client);
 217     if (result != ERROR_SUCCESS)
 218       return WIFI_PHY_LAYER_PROTOCOL_NONE;
 219   }
 220
 221   WLAN_INTERFACE_INFO_LIST* interface_list_ptr = NULL;
 222   DWORD result =
 223       wlanapi.enum_interfaces_func(client.Get(), NULL, &interface_list_ptr);
 224   if (result != ERROR_SUCCESS)
 225     return WIFI_PHY_LAYER_PROTOCOL_NONE;
 226   scoped_ptr<WLAN_INTERFACE_INFO_LIST, internal::WlanApiDeleter> interface_list(
 227       interface_list_ptr);
 228
 229   // Assume at most one connected wifi interface.
 230   WLAN_INTERFACE_INFO* info = NULL;
 231   for (unsigned i = 0; i < interface_list->dwNumberOfItems; ++i) {
 232     if (interface_list->InterfaceInfo[i].isState ==
 233         wlan_interface_state_connected) {
 234       info = &interface_list->InterfaceInfo[i];
 235       break;
 236     }
 237   }
 238
 239   if (info == NULL)
 240     return WIFI_PHY_LAYER_PROTOCOL_NONE;
 241
 242   WLAN_CONNECTION_ATTRIBUTES* conn_info_ptr;
 243   DWORD conn_info_size = 0;
 244   WLAN_OPCODE_VALUE_TYPE op_code;
 245   result = wlanapi.query_interface_func(
 246       client.Get(), &info->InterfaceGuid, wlan_intf_opcode_current_connection,
 247       NULL, &conn_info_size, reinterpret_cast<VOID**>(&conn_info_ptr),
 248       &op_code);
 249   if (result != ERROR_SUCCESS)
 250     return WIFI_PHY_LAYER_PROTOCOL_UNKNOWN;
 251   scoped_ptr<WLAN_CONNECTION_ATTRIBUTES, internal::WlanApiDeleter> conn_info(
 252       conn_info_ptr);
 253
 254   switch (conn_info->wlanAssociationAttributes.dot11PhyType) {
 255     case dot11_phy_type_fhss:
 256       return WIFI_PHY_LAYER_PROTOCOL_ANCIENT;
 257     case dot11_phy_type_dsss:
 258       return WIFI_PHY_LAYER_PROTOCOL_B;
 259     case dot11_phy_type_irbaseband:
 260       return WIFI_PHY_LAYER_PROTOCOL_ANCIENT;
 261     case dot11_phy_type_ofdm:
 262       return WIFI_PHY_LAYER_PROTOCOL_A;
 263     case dot11_phy_type_hrdsss:
 264       return WIFI_PHY_LAYER_PROTOCOL_B;
 265     case dot11_phy_type_erp:
 266       return WIFI_PHY_LAYER_PROTOCOL_G;
 267     case dot11_phy_type_ht:
 268       return WIFI_PHY_LAYER_PROTOCOL_N;
 269     default:
 270       return WIFI_PHY_LAYER_PROTOCOL_UNKNOWN;
 271   }
 272 }
 273
 274 // Note: There is no need to explicitly set the options back
 275 // as the OS will automatically set them back when the WlanHandle
 276 // is closed.
 277 class WifiOptionSetter : public ScopedWifiOptions {
 278  public:
 279   WifiOptionSetter(int options) {
 280     const internal::WlanApi& wlanapi = internal::WlanApi::GetInstance();
 281     if (!wlanapi.initialized)
 282       return;
 283
 284     DWORD cur_version = 0;
 285     const DWORD kMaxClientVersion = 2;
 286     DWORD result = wlanapi.OpenHandle(
 287         kMaxClientVersion, &cur_version, &client_);
 288     if (result != ERROR_SUCCESS)
 289       return;
 290
 291     WLAN_INTERFACE_INFO_LIST* interface_list_ptr = NULL;
 292     result = wlanapi.enum_interfaces_func(client_.Get(), NULL,
 293                                           &interface_list_ptr);
 294     if (result != ERROR_SUCCESS)
 295       return;
 296     scoped_ptr<WLAN_INTERFACE_INFO_LIST, internal::WlanApiDeleter>
 297         interface_list(interface_list_ptr);
 298
 299     for (unsigned i = 0; i < interface_list->dwNumberOfItems; ++i) {
 300       WLAN_INTERFACE_INFO* info = &interface_list->InterfaceInfo[i];
 301       if (options & WIFI_OPTIONS_DISABLE_SCAN) {
 302         BOOL data = false;
 303         wlanapi.set_interface_func(client_.Get(),
 304                                    &info->InterfaceGuid,
 305                                    wlan_intf_opcode_background_scan_enabled,
 306                                    sizeof(data),
 307                                    &data,
 308                                    NULL);
 309       }
 310       if (options & WIFI_OPTIONS_MEDIA_STREAMING_MODE) {
 311         BOOL data = true;
 312         wlanapi.set_interface_func(client_.Get(),
 313                                    &info->InterfaceGuid,
 314                                    wlan_intf_opcode_media_streaming_mode,
 315                                    sizeof(data),
 316                                    &data,
 317                                    NULL);
 318       }
 319     }
 320   }
 321
 322  private:
 323   internal::WlanHandle client_;
 324 };
 325
 326 scoped_ptr<ScopedWifiOptions> SetWifiOptions(int options) {
 327   return scoped_ptr<ScopedWifiOptions>(new WifiOptionSetter(options));
 328 }
 329
 330 std::string GetWifiSSID() {
 331   NOTIMPLEMENTED();
 332   return "";
 333 }
 334
 335 }  // namespace net