[net] Add WifiPhyMode to SystemProfile

net/base/net_util_win.cc

Index: net/base/net_util_win.cc
diff --git a/net/base/net_util_win.cc b/net/base/net_util_win.cc
index 5b101aede6b8c4654f29aa487be27b63835d35aa..c3704f260dd2b778e9a63377654c58561637dfc3 100644
--- a/net/base/net_util_win.cc
+++ b/net/base/net_util_win.cc
@@ -5,16 +5,19 @@
 #include "net/base/net_util.h"
 
 #include <iphlpapi.h>
+#include <wlanapi.h>
 
 #include <algorithm>
 
 #include "base/file_path.h"
+#include "base/lazy_instance.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/string_piece.h"
 #include "base/string_util.h"
 #include "base/sys_string_conversions.h"
 #include "base/threading/thread_restrictions.h"
 #include "base/utf_string_conversions.h"
+#include "base/win/scoped_handle.h"
 #include "googleurl/src/gurl.h"
 #include "net/base/escape.h"
 #include "net/base/ip_endpoint.h"
@@ -127,4 +130,139 @@ bool GetNetworkList(NetworkInterfaceList* networks) {
   return true;
 }
 
+WifiPhyMode GetWifiPhyMode() {
+  struct WlanApi {
+    typedef DWORD (WINAPI *WlanOpenHandleFunc)(
+        DWORD, VOID*, DWORD*, HANDLE*);
+    typedef DWORD (WINAPI *WlanEnumInterfacesFunc)(
+        HANDLE, VOID*, WLAN_INTERFACE_INFO_LIST **);
+    typedef DWORD (WINAPI *WlanQueryInterfaceFunc)(
+        HANDLE, const GUID *, WLAN_INTF_OPCODE, VOID*, DWORD*, VOID**,
+        WLAN_OPCODE_VALUE_TYPE*);
+    typedef VOID (WINAPI *WlanFreeMemoryFunc)(VOID*);
+    typedef DWORD (WINAPI *WlanCloseHandleFunc)(HANDLE, VOID*);
+
+    WlanApi() : initialized(false) {
+      // Use an absolute path to load the DLL to avoid DLL preloading attacks.
+      static const wchar_t* const kDLL = L"%WINDIR%\\system32\\wlanapi.dll";
+      wchar_t path[MAX_PATH] = {0};
+      ExpandEnvironmentStrings(kDLL, path, arraysize(path));
+      module = ::LoadLibraryEx(path, NULL, LOAD_WITH_ALTERED_SEARCH_PATH);
+      if (!module)
+        return;
+
+      open_handle_func = reinterpret_cast<WlanOpenHandleFunc>(
+          ::GetProcAddress(module, "WlanOpenHandle"));
+      enum_interfaces_func = reinterpret_cast<WlanEnumInterfacesFunc>(
+          ::GetProcAddress(module, "WlanEnumInterfaces"));
+      query_interface_func = reinterpret_cast<WlanQueryInterfaceFunc>(
+          ::GetProcAddress(module, "WlanQueryInterface"));
+      free_memory_func = reinterpret_cast<WlanFreeMemoryFunc>(
+          ::GetProcAddress(module, "WlanFreeMemory"));
+      close_handle_func = reinterpret_cast<WlanCloseHandleFunc>(
+          ::GetProcAddress(module, "WlanCloseHandle"));
+      initialized = open_handle_func && enum_interfaces_func &&
+                    query_interface_func && free_memory_func &&
+                    close_handle_func;
+    }
+
+    HMODULE module;
+    WlanOpenHandleFunc open_handle_func;
+    WlanEnumInterfacesFunc enum_interfaces_func;
+    WlanQueryInterfaceFunc query_interface_func;
+    WlanFreeMemoryFunc free_memory_func;
+    WlanCloseHandleFunc close_handle_func;
+    bool initialized;
+  };
+
+  static base::LazyInstance<WlanApi>::Leaky lazy_wlanapi =
+      LAZY_INSTANCE_INITIALIZER;
+
+  struct WlanApiHandleTraits {
+    typedef HANDLE Handle;
+
+    static bool CloseHandle(HANDLE handle) {
+      return lazy_wlanapi.Get().close_handle_func(handle, NULL) ==
+          ERROR_SUCCESS;
+    }
+    static bool IsHandleValid(HANDLE handle) {
+      return base::win::HandleTraits::IsHandleValid(handle);
+    }
+    static HANDLE NullHandle() {
+      return base::win::HandleTraits::NullHandle();
+    }
+  };
+
+  typedef base::win::GenericScopedHandle<WlanApiHandleTraits,
+                                         base::win::VerifierTraits> WlanHandle;
+
+  struct WlanApiDeleter {
+    inline void operator()(void* ptr) const {
+      lazy_wlanapi.Get().free_memory_func(ptr);
+    }
+  };
+
+  const WlanApi& wlanapi = lazy_wlanapi.Get();
+  if (!wlanapi.initialized)
+    return WIFI_PHY_MODE_NONE;
+
+  WlanHandle client;
+  DWORD cur_version = 0;
+  const DWORD kMaxClientVersion = 2;
+  DWORD result = wlanapi.open_handle_func(kMaxClientVersion, NULL, &cur_version,
+                                          client.Receive());
+  if (result != ERROR_SUCCESS)
+    return WIFI_PHY_MODE_NONE;
+
+  WLAN_INTERFACE_INFO_LIST* interface_list_ptr = NULL;
+  result = wlanapi.enum_interfaces_func(client, NULL, &interface_list_ptr);
+  if (result != ERROR_SUCCESS)
+    return WIFI_PHY_MODE_NONE;
+  scoped_ptr<WLAN_INTERFACE_INFO_LIST, WlanApiDeleter> interface_list(
+      interface_list_ptr);
+
+  // Assume at most one connected wifi interface.
+  WLAN_INTERFACE_INFO* info = NULL;
+  for (unsigned i = 0; i < interface_list->dwNumberOfItems; ++i) {
+    if (interface_list->InterfaceInfo[i].isState ==
+        wlan_interface_state_connected) {
+      info = &interface_list->InterfaceInfo[i];
+      break;
+    }
+  }
+
+  if (info == NULL)
+    return WIFI_PHY_MODE_NONE;
+
+  WLAN_CONNECTION_ATTRIBUTES* conn_info_ptr;
+  DWORD conn_info_size = 0;
+  WLAN_OPCODE_VALUE_TYPE op_code;
+  result = wlanapi.query_interface_func(
+      client, &info->InterfaceGuid, wlan_intf_opcode_current_connection, NULL,
+      &conn_info_size, reinterpret_cast<VOID**>(&conn_info_ptr), &op_code);
+  if (result != ERROR_SUCCESS)
+    return WIFI_PHY_MODE_UNKNOWN;
+  scoped_ptr<WLAN_CONNECTION_ATTRIBUTES, WlanApiDeleter> conn_info(
+      conn_info_ptr);
+
+  switch (conn_info->wlanAssociationAttributes.dot11PhyType) {
+    case dot11_phy_type_fhss:
+      return WIFI_PHY_MODE_ANCIENT;
+    case dot11_phy_type_dsss:
+      return WIFI_PHY_MODE_B;
+    case dot11_phy_type_irbaseband:
+      return WIFI_PHY_MODE_ANCIENT;
+    case dot11_phy_type_ofdm:
+      return WIFI_PHY_MODE_A;
+    case dot11_phy_type_hrdsss:
+      return WIFI_PHY_MODE_B;
+    case dot11_phy_type_erp:
+      return WIFI_PHY_MODE_G;
+    case dot11_phy_type_ht:
+      return WIFI_PHY_MODE_N;
+    default:
+      return WIFI_PHY_MODE_UNKNOWN;
+  }
+}
+
 }  // namespace net