[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..f2d2fa414ea1ae01aeeb4085ee207fead7b039ce 100644
--- a/net/base/net_util_win.cc
+++ b/net/base/net_util_win.cc
@@ -5,11 +5,15 @@
 #include "net/base/net_util.h"
 
 #include <iphlpapi.h>
+#include <wlanapi.h>
 
 #include <algorithm>
 
+#include "base/bind.h"
+#include "base/bind_helpers.h"
 #include "base/file_path.h"
 #include "base/memory/scoped_ptr.h"
+#include "base/scoped_native_library.h"

[rvargas (doing something else), 2013/02/11 21:14:44]

not good.

Note that I failed to mention the other day that an alternative to manual
binding is delay loading. There is some interest in improving/customizing delay
loading and if that pans out we'll be removing manual loading.

[szym, 2013/02/11 22:51:19]

Done.

 #include "base/string_piece.h"
 #include "base/string_util.h"
 #include "base/sys_string_conversions.h"
@@ -127,4 +131,91 @@ bool GetNetworkList(NetworkInterfaceList* networks) {
   return true;
 }
 
+WifiPhyMode GetWifiPhyMode() {
+  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*);
+
+  base::ScopedNativeLibrary wlanapi(
+      FilePath(FILE_PATH_LITERAL("wlanapi.dll")));
+  WlanOpenHandleFunc open_handle_func = reinterpret_cast<WlanOpenHandleFunc>(
+      wlanapi.GetFunctionPointer("WlanOpenHandle"));
+  WlanEnumInterfacesFunc enum_interfaces_func =
+      reinterpret_cast<WlanEnumInterfacesFunc>(
+          wlanapi.GetFunctionPointer("WlanEnumInterfaces"));
+  WlanQueryInterfaceFunc query_interface_func =
+      reinterpret_cast<WlanQueryInterfaceFunc>(
+          wlanapi.GetFunctionPointer("WlanQueryInterface"));
+  WlanFreeMemoryFunc free_memory_func = reinterpret_cast<WlanFreeMemoryFunc>(
+      wlanapi.GetFunctionPointer("WlanFreeMemory"));
+  WlanCloseHandleFunc close_handle_func =
+      reinterpret_cast<WlanCloseHandleFunc>(
+          wlanapi.GetFunctionPointer("WlanCloseHandle"));
+  if (!(open_handle_func && enum_interfaces_func && query_interface_func &&
+        free_memory_func && close_handle_func)) {
+    return WIFI_PHY_MODE_NONE;
+  }
+
+  HANDLE client = NULL;

[rvargas (doing something else), 2013/02/11 21:14:44]

This should be a GenericScopedHandle with a custom HandleTraits

[szym, 2013/02/11 22:51:19]

Done.

+  DWORD cur_version = 0;
+  DWORD result = open_handle_func(2 /* max_client */, NULL, &cur_version,
+                                  &client);
+  if (result != ERROR_SUCCESS)
+    return WIFI_PHY_MODE_NONE;
+  base::ScopedClosureRunner close_handle(
+      base::Bind(base::IgnoreResult(close_handle_func), client, (VOID*)NULL));
+
+  WLAN_INTERFACE_INFO_LIST* interface_list = NULL;

[rvargas (doing something else), 2013/02/11 21:14:44]

scoped_ptr with custom Deleter

[szym, 2013/02/11 22:51:19]

Done, although there does not seem to be something as convenient as
ScopedHandle::Receiver.

+  result = enum_interfaces_func(client, NULL, &interface_list);
+  if (result != ERROR_SUCCESS)
+    return WIFI_PHY_MODE_NONE;
+  base::ScopedClosureRunner free_interfaces(
+      base::Bind(free_memory_func, interface_list));
+
+  if (interface_list->dwNumberOfItems == 0)
+    return WIFI_PHY_MODE_NONE;
+
+  // Assume one wifi interface.
+  WLAN_INTERFACE_INFO& info = interface_list->InterfaceInfo[0];
+  if (info.isState != wlan_interface_state_connected)
+    return WIFI_PHY_MODE_NONE;

[rvargas (doing something else), 2013/02/11 21:14:44]

look at the next interface?

[szym, 2013/02/11 22:51:19]

Done.

+
+  WLAN_CONNECTION_ATTRIBUTES* conn_info = NULL;

[rvargas (doing something else), 2013/02/11 21:14:44]

same here

[szym, 2013/02/11 22:51:19]

Done.

+  DWORD conn_info_size = 0;
+  WLAN_OPCODE_VALUE_TYPE op_code;
+
+  result = query_interface_func(
+      client, &info.InterfaceGuid, wlan_intf_opcode_current_connection, NULL,
+      &conn_info_size, (VOID**)&conn_info, &op_code);

[rvargas (doing something else), 2013/02/11 21:14:44]

c++ cast (Doesn't this work without a cast?)

[szym, 2013/02/11 22:51:19]

Done.

+  if (result != ERROR_SUCCESS)
+    return WIFI_PHY_MODE_UNKNOWN;
+  base::ScopedClosureRunner free_conn_info(
+      base::Bind(free_memory_func, conn_info));
+
+  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