| // Copyright (c) 2012 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #include "net/base/net_util.h" |
| |
| #include <iphlpapi.h> |
| #include <wlanapi.h> |
| |
| #include <algorithm> |
| |
| #include "base/files/file_path.h" |
| #include "base/lazy_instance.h" |
| #include "base/memory/scoped_ptr.h" |
| #include "base/strings/string_piece.h" |
| #include "base/strings/string_util.h" |
| #include "base/strings/sys_string_conversions.h" |
| #include "base/strings/utf_string_conversions.h" |
| #include "base/threading/thread_restrictions.h" |
| #include "base/win/scoped_handle.h" |
| #include "base/win/windows_version.h" |
| #include "net/base/escape.h" |
| #include "net/base/ip_endpoint.h" |
| #include "net/base/net_errors.h" |
| #include "url/gurl.h" |
| |
| namespace net { |
| |
| namespace { |
| |
| 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; |
| } |
| |
| template <typename T> |
| DWORD OpenHandle(DWORD client_version, DWORD* cur_version, T* handle) const { |
| HANDLE temp_handle; |
| DWORD result = open_handle_func(client_version, NULL, cur_version, |
| &temp_handle); |
| if (result != ERROR_SUCCESS) |
| return result; |
| handle->Set(temp_handle); |
| return ERROR_SUCCESS; |
| } |
| |
| HMODULE module; |
| WlanOpenHandleFunc open_handle_func; |
| WlanEnumInterfacesFunc enum_interfaces_func; |
| WlanQueryInterfaceFunc query_interface_func; |
| WlanFreeMemoryFunc free_memory_func; |
| WlanCloseHandleFunc close_handle_func; |
| bool initialized; |
| }; |
| |
| // Converts Windows defined types to NetworkInterfaceType. |
| NetworkChangeNotifier::ConnectionType GetNetworkInterfaceType(DWORD ifType) { |
| // Bail out for pre-Vista versions of Windows which are documented to give |
| // inaccurate results like returning Ethernet for WiFi. |
| // http://msdn.microsoft.com/en-us/library/windows/desktop/aa366058.aspx |
| if (base::win::GetVersion() < base::win::VERSION_VISTA) |
| return NetworkChangeNotifier::CONNECTION_UNKNOWN; |
| |
| NetworkChangeNotifier::ConnectionType type = |
| NetworkChangeNotifier::CONNECTION_UNKNOWN; |
| if (ifType == IF_TYPE_ETHERNET_CSMACD) { |
| type = NetworkChangeNotifier::CONNECTION_ETHERNET; |
| } else if (ifType == IF_TYPE_IEEE80211) { |
| type = NetworkChangeNotifier::CONNECTION_WIFI; |
| } |
| // TODO(mallinath) - Cellular? |
| return type; |
| } |
| |
| } // namespace |
| |
| bool GetNetworkList(NetworkInterfaceList* networks, int policy) { |
| // GetAdaptersAddresses() may require IO operations. |
| base::ThreadRestrictions::AssertIOAllowed(); |
| bool is_xp = base::win::GetVersion() < base::win::VERSION_VISTA; |
| ULONG len = 0; |
| ULONG flags = is_xp ? GAA_FLAG_INCLUDE_PREFIX : 0; |
| // First get number of networks. |
| ULONG result = GetAdaptersAddresses(AF_UNSPEC, flags, NULL, NULL, &len); |
| if (result != ERROR_BUFFER_OVERFLOW) { |
| // There are 0 networks. |
| return true; |
| } |
| scoped_ptr<char[]> buf(new char[len]); |
| IP_ADAPTER_ADDRESSES *adapters = |
| reinterpret_cast<IP_ADAPTER_ADDRESSES *>(buf.get()); |
| result = GetAdaptersAddresses(AF_UNSPEC, flags, NULL, adapters, &len); |
| if (result != NO_ERROR) { |
| LOG(ERROR) << "GetAdaptersAddresses failed: " << result; |
| return false; |
| } |
| |
| // These two variables are used below when this method is asked to pick a |
| // IPv6 address which has the shortest lifetime. |
| ULONG ipv6_valid_lifetime = 0; |
| scoped_ptr<NetworkInterface> ipv6_address; |
| |
| for (IP_ADAPTER_ADDRESSES *adapter = adapters; adapter != NULL; |
| adapter = adapter->Next) { |
| // Ignore the loopback device. |
| if (adapter->IfType == IF_TYPE_SOFTWARE_LOOPBACK) { |
| continue; |
| } |
| |
| if (adapter->OperStatus != IfOperStatusUp) { |
| continue; |
| } |
| |
| // Ignore any HOST side vmware adapters with a description like: |
| // VMware Virtual Ethernet Adapter for VMnet1 |
| // but don't ignore any GUEST side adapters with a description like: |
| // VMware Accelerated AMD PCNet Adapter #2 |
| if (policy == EXCLUDE_HOST_SCOPE_VIRTUAL_INTERFACES && |
| strstr(adapter->AdapterName, "VMnet") != NULL) { |
| continue; |
| } |
| |
| for (IP_ADAPTER_UNICAST_ADDRESS* address = adapter->FirstUnicastAddress; |
| address; address = address->Next) { |
| int family = address->Address.lpSockaddr->sa_family; |
| if (family == AF_INET || family == AF_INET6) { |
| IPEndPoint endpoint; |
| if (endpoint.FromSockAddr(address->Address.lpSockaddr, |
| address->Address.iSockaddrLength)) { |
| // XP has no OnLinkPrefixLength field. |
| size_t net_prefix = is_xp ? 0 : address->OnLinkPrefixLength; |
| if (is_xp) { |
| // Prior to Windows Vista the FirstPrefix pointed to the list with |
| // single prefix for each IP address assigned to the adapter. |
| // Order of FirstPrefix does not match order of FirstUnicastAddress, |
| // so we need to find corresponding prefix. |
| for (IP_ADAPTER_PREFIX* prefix = adapter->FirstPrefix; prefix; |
| prefix = prefix->Next) { |
| int prefix_family = prefix->Address.lpSockaddr->sa_family; |
| IPEndPoint network_endpoint; |
| if (prefix_family == family && |
| network_endpoint.FromSockAddr(prefix->Address.lpSockaddr, |
| prefix->Address.iSockaddrLength) && |
| IPNumberMatchesPrefix(endpoint.address(), |
| network_endpoint.address(), |
| prefix->PrefixLength)) { |
| net_prefix = std::max<size_t>(net_prefix, prefix->PrefixLength); |
| } |
| } |
| } |
| uint32 index = |
| (family == AF_INET) ? adapter->IfIndex : adapter->Ipv6IfIndex; |
| // Pick one IPv6 address with least valid lifetime. |
| // The reason we are checking |ValidLifeftime| as there is no other |
| // way identifying the interface type. Usually (and most likely) temp |
| // IPv6 will have a shorter ValidLifetime value then the permanent |
| // interface. |
| if (family == AF_INET6 && |
| (policy & INCLUDE_ONLY_TEMP_IPV6_ADDRESS_IF_POSSIBLE)) { |
| if (ipv6_valid_lifetime == 0 || |
| ipv6_valid_lifetime > address->ValidLifetime) { |
| ipv6_valid_lifetime = address->ValidLifetime; |
| ipv6_address.reset(new NetworkInterface(adapter->AdapterName, |
| base::SysWideToNativeMB(adapter->FriendlyName), |
| index, |
| GetNetworkInterfaceType(adapter->IfType), |
| endpoint.address(), |
| net_prefix)); |
| continue; |
| } |
| } |
| networks->push_back( |
| NetworkInterface(adapter->AdapterName, |
| base::SysWideToNativeMB(adapter->FriendlyName), |
| index, GetNetworkInterfaceType(adapter->IfType), |
| endpoint.address(), net_prefix)); |
| } |
| } |
| } |
| } |
| |
| if (ipv6_address.get()) { |
| networks->push_back(*(ipv6_address.get())); |
| } |
| return true; |
| } |
| |
| WifiPHYLayerProtocol GetWifiPHYLayerProtocol() { |
| 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::DummyVerifierTraits> 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_LAYER_PROTOCOL_NONE; |
| |
| WlanHandle client; |
| DWORD cur_version = 0; |
| const DWORD kMaxClientVersion = 2; |
| DWORD result = wlanapi.OpenHandle(kMaxClientVersion, &cur_version, &client); |
| if (result != ERROR_SUCCESS) |
| return WIFI_PHY_LAYER_PROTOCOL_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_LAYER_PROTOCOL_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_LAYER_PROTOCOL_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_LAYER_PROTOCOL_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_LAYER_PROTOCOL_ANCIENT; |
| case dot11_phy_type_dsss: |
| return WIFI_PHY_LAYER_PROTOCOL_B; |
| case dot11_phy_type_irbaseband: |
| return WIFI_PHY_LAYER_PROTOCOL_ANCIENT; |
| case dot11_phy_type_ofdm: |
| return WIFI_PHY_LAYER_PROTOCOL_A; |
| case dot11_phy_type_hrdsss: |
| return WIFI_PHY_LAYER_PROTOCOL_B; |
| case dot11_phy_type_erp: |
| return WIFI_PHY_LAYER_PROTOCOL_G; |
| case dot11_phy_type_ht: |
| return WIFI_PHY_LAYER_PROTOCOL_N; |
| default: |
| return WIFI_PHY_LAYER_PROTOCOL_UNKNOWN; |
| } |
| } |
| |
| } // namespace net |
