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// 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 "net/base/net_util_win.h"
#include "url/gurl.h"
namespace net {
namespace {
// 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
namespace internal {
base::LazyInstance<WlanApi>::Leaky lazy_wlanapi =
LAZY_INSTANCE_INITIALIZER;
WlanApi& WlanApi::GetInstance() {
return lazy_wlanapi.Get();
}
WlanApi::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"));
set_interface_func = reinterpret_cast<WlanSetInterfaceFunc>(
::GetProcAddress(module, "WlanSetInterface"));
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 && set_interface_func &&
free_memory_func && close_handle_func;
}
} // namespace internal
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,
IP_ADDRESS_ATTRIBUTE_NONE));
continue;
}
}
networks->push_back(
NetworkInterface(adapter->AdapterName,
base::SysWideToNativeMB(adapter->FriendlyName),
index,
GetNetworkInterfaceType(adapter->IfType),
endpoint.address(),
net_prefix,
IP_ADDRESS_ATTRIBUTE_NONE));
}
}
}
}
if (ipv6_address.get()) {
networks->push_back(*(ipv6_address.get()));
}
return true;
}
WifiPHYLayerProtocol GetWifiPHYLayerProtocol() {
const internal::WlanApi& wlanapi = internal::WlanApi::GetInstance();
if (!wlanapi.initialized)
return WIFI_PHY_LAYER_PROTOCOL_NONE;
internal::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, internal::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, internal::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;
}
}
// Note: There is no need to explicitly set the options back
// as the OS will automatically set them back when the WlanHandle
// is closed.
class WifiOptionSetter : public ScopedWifiOptions {
public:
WifiOptionSetter(int options) {
const internal::WlanApi& wlanapi = internal::WlanApi::GetInstance();
if (!wlanapi.initialized)
return;
DWORD cur_version = 0;
const DWORD kMaxClientVersion = 2;
DWORD result = wlanapi.OpenHandle(
kMaxClientVersion, &cur_version, &client_);
if (result != ERROR_SUCCESS)
return;
WLAN_INTERFACE_INFO_LIST* interface_list_ptr = NULL;
result = wlanapi.enum_interfaces_func(client_, NULL, &interface_list_ptr);
if (result != ERROR_SUCCESS)
return;
scoped_ptr<WLAN_INTERFACE_INFO_LIST, internal::WlanApiDeleter>
interface_list(interface_list_ptr);
for (unsigned i = 0; i < interface_list->dwNumberOfItems; ++i) {
WLAN_INTERFACE_INFO* info = &interface_list->InterfaceInfo[i];
if (options & WIFI_OPTIONS_DISABLE_SCAN) {
BOOL data = false;
wlanapi.set_interface_func(client_,
&info->InterfaceGuid,
wlan_intf_opcode_background_scan_enabled,
sizeof(data),
&data,
NULL);
}
if (options & WIFI_OPTIONS_MEDIA_STREAMING_MODE) {
BOOL data = true;
wlanapi.set_interface_func(client_,
&info->InterfaceGuid,
wlan_intf_opcode_media_streaming_mode,
sizeof(data),
&data,
NULL);
}
}
}
private:
internal::WlanHandle client_;
};
scoped_ptr<ScopedWifiOptions> SetWifiOptions(int options) {
return scoped_ptr<ScopedWifiOptions>(new WifiOptionSetter(options));
}
} // namespace net
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