// Copyright 2012 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifdef UNSAFE_BUFFERS_BUILD
// TODO(crbug.com/40284755): Remove this and spanify to fix the errors.
#pragma allow_unsafe_buffers
#endif
#include "net/base/network_interfaces_win.h"
#include <algorithm>
#include <memory>
#include <string_view>
#include "base/files/file_path.h"
#include "base/lazy_instance.h"
#include "base/strings/escape.h"
#include "base/strings/string_util.h"
#include "base/strings/sys_string_conversions.h"
#include "base/strings/utf_string_conversions.h"
#include "base/threading/scoped_blocking_call.h"
#include "base/threading/scoped_thread_priority.h"
#include "base/win/scoped_handle.h"
#include "net/base/ip_endpoint.h"
#include "net/base/net_errors.h"
#include "url/gurl.h"
namespace net {
namespace {
// Converts Windows defined types to NetworkInterfaceType.
NetworkChangeNotifier::ConnectionType GetNetworkInterfaceType(DWORD ifType) {
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;
}
// Returns scoped_ptr to WLAN_CONNECTION_ATTRIBUTES. The scoped_ptr may hold a
// NULL pointer if WLAN_CONNECTION_ATTRIBUTES is unavailable.
std::unique_ptr<WLAN_CONNECTION_ATTRIBUTES, internal::WlanApiDeleter>
GetConnectionAttributes() {
const internal::WlanApi& wlanapi = internal::WlanApi::GetInstance();
std::unique_ptr<WLAN_CONNECTION_ATTRIBUTES, internal::WlanApiDeleter>
wlan_connection_attributes;
if (!wlanapi.initialized)
return wlan_connection_attributes;
internal::WlanHandle client;
DWORD cur_version = 0;
const DWORD kMaxClientVersion = 2;
DWORD result = wlanapi.OpenHandle(kMaxClientVersion, &cur_version, &client);
if (result != ERROR_SUCCESS)
return wlan_connection_attributes;
WLAN_INTERFACE_INFO_LIST* interface_list_ptr = nullptr;
result =
wlanapi.enum_interfaces_func(client.Get(), nullptr, &interface_list_ptr);
if (result != ERROR_SUCCESS)
return wlan_connection_attributes;
std::unique_ptr<WLAN_INTERFACE_INFO_LIST, internal::WlanApiDeleter>
interface_list(interface_list_ptr);
// Assume at most one connected wifi interface.
WLAN_INTERFACE_INFO* info = nullptr;
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 == nullptr)
return wlan_connection_attributes;
WLAN_CONNECTION_ATTRIBUTES* conn_info_ptr = nullptr;
DWORD conn_info_size = 0;
WLAN_OPCODE_VALUE_TYPE op_code;
result = wlanapi.query_interface_func(
client.Get(), &info->InterfaceGuid, wlan_intf_opcode_current_connection,
nullptr, &conn_info_size, reinterpret_cast<VOID**>(&conn_info_ptr),
&op_code);
wlan_connection_attributes.reset(conn_info_ptr);
if (result == ERROR_SUCCESS)
DCHECK(conn_info_ptr);
else
wlan_connection_attributes.reset();
return wlan_connection_attributes;
}
} // namespace
namespace internal {
base::LazyInstance<WlanApi>::Leaky lazy_wlanapi =
LAZY_INSTANCE_INITIALIZER;
WlanApi& WlanApi::GetInstance() {
return lazy_wlanapi.Get();
}
WlanApi::WlanApi() : initialized(false) {
// Mitigate the issues caused by loading DLLs on a background thread
// (http://crbug/973868).
SCOPED_MAY_LOAD_LIBRARY_AT_BACKGROUND_PRIORITY();
HMODULE module =
::LoadLibraryEx(L"wlanapi.dll", nullptr, LOAD_LIBRARY_SEARCH_SYSTEM32);
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;
}
bool GetNetworkListImpl(NetworkInterfaceList* networks,
int policy,
const IP_ADAPTER_ADDRESSES* adapters) {
for (const IP_ADAPTER_ADDRESSES* adapter = adapters; adapter != nullptr;
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") != nullptr) {
continue;
}
std::optional<Eui48MacAddress> mac_address;
mac_address.emplace();
if (adapter->PhysicalAddressLength == mac_address->size()) {
std::copy_n(reinterpret_cast<const uint8_t*>(adapter->PhysicalAddress),
mac_address->size(), mac_address->begin());
} else {
mac_address.reset();
}
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)) {
size_t prefix_length = address->OnLinkPrefixLength;
// If the duplicate address detection (DAD) state is not changed to
// Preferred, skip this address.
if (address->DadState != IpDadStatePreferred) {
continue;
}
uint32_t index =
(family == AF_INET) ? adapter->IfIndex : adapter->Ipv6IfIndex;
// From http://technet.microsoft.com/en-us/ff568768(v=vs.60).aspx, the
// way to identify a temporary IPv6 Address is to check if
// PrefixOrigin is equal to IpPrefixOriginRouterAdvertisement and
// SuffixOrigin equal to IpSuffixOriginRandom.
int ip_address_attributes = IP_ADDRESS_ATTRIBUTE_NONE;
if (family == AF_INET6) {
if (address->PrefixOrigin == IpPrefixOriginRouterAdvertisement &&
address->SuffixOrigin == IpSuffixOriginRandom) {
ip_address_attributes |= IP_ADDRESS_ATTRIBUTE_TEMPORARY;
}
if (address->PreferredLifetime == 0) {
ip_address_attributes |= IP_ADDRESS_ATTRIBUTE_DEPRECATED;
}
}
networks->push_back(NetworkInterface(
adapter->AdapterName,
base::SysWideToNativeMB(adapter->FriendlyName), index,
GetNetworkInterfaceType(adapter->IfType), endpoint.address(),
prefix_length, ip_address_attributes, mac_address));
}
}
}
}
return true;
}
} // namespace internal
bool GetNetworkList(NetworkInterfaceList* networks, int policy) {
// Max number of times to retry GetAdaptersAddresses due to
// ERROR_BUFFER_OVERFLOW. If GetAdaptersAddresses returns this indefinitely
// due to an unforseen reason, we don't want to be stuck in an endless loop.
static constexpr int MAX_GETADAPTERSADDRESSES_TRIES = 10;
// Use an initial buffer size of 15KB, as recommended by MSDN. See:
// https://msdn.microsoft.com/en-us/library/windows/desktop/aa365915(v=vs.85).aspx
static constexpr int INITIAL_BUFFER_SIZE = 15000;
ULONG len = INITIAL_BUFFER_SIZE;
ULONG flags = 0;
// Initial buffer allocated on stack.
char initial_buf[INITIAL_BUFFER_SIZE];
// Dynamic buffer in case initial buffer isn't large enough.
std::unique_ptr<char[]> buf;
IP_ADAPTER_ADDRESSES* adapters = nullptr;
{
// GetAdaptersAddresses() may require IO operations.
base::ScopedBlockingCall scoped_blocking_call(
FROM_HERE, base::BlockingType::MAY_BLOCK);
adapters = reinterpret_cast<IP_ADAPTER_ADDRESSES*>(&initial_buf);
ULONG result =
GetAdaptersAddresses(AF_UNSPEC, flags, nullptr, adapters, &len);
// If we get ERROR_BUFFER_OVERFLOW, call GetAdaptersAddresses in a loop,
// because the required size may increase between successive calls,
// resulting in ERROR_BUFFER_OVERFLOW multiple times.
for (int tries = 1; result == ERROR_BUFFER_OVERFLOW &&
tries < MAX_GETADAPTERSADDRESSES_TRIES;
++tries) {
buf = std::make_unique<char[]>(len);
adapters = reinterpret_cast<IP_ADAPTER_ADDRESSES*>(buf.get());
result = GetAdaptersAddresses(AF_UNSPEC, flags, nullptr, adapters, &len);
}
if (result == ERROR_NO_DATA) {
// There are 0 networks.
return true;
} else if (result != NO_ERROR) {
LOG(ERROR) << "GetAdaptersAddresses failed: " << result;
return false;
}
}
return internal::GetNetworkListImpl(networks, policy, adapters);
}
// 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 = nullptr;
result = wlanapi.enum_interfaces_func(client_.Get(), nullptr,
&interface_list_ptr);
if (result != ERROR_SUCCESS)
return;
std::unique_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_.Get(), &info->InterfaceGuid,
wlan_intf_opcode_background_scan_enabled,
sizeof(data), &data, nullptr);
}
if (options & WIFI_OPTIONS_MEDIA_STREAMING_MODE) {
BOOL data = true;
wlanapi.set_interface_func(client_.Get(), &info->InterfaceGuid,
wlan_intf_opcode_media_streaming_mode,
sizeof(data), &data, nullptr);
}
}
}
private:
internal::WlanHandle client_;
};
std::unique_ptr<ScopedWifiOptions> SetWifiOptions(int options) {
return std::make_unique<WifiOptionSetter>(options);
}
std::string GetWifiSSID() {
auto conn_info = GetConnectionAttributes();
if (!conn_info.get())
return "";
const DOT11_SSID dot11_ssid = conn_info->wlanAssociationAttributes.dot11Ssid;
return std::string(reinterpret_cast<const char*>(dot11_ssid.ucSSID),
dot11_ssid.uSSIDLength);
}
} // namespace net
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