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// Copyright (c) 2010 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 "base/win/wmi.h"
#include <windows.h>
#include <objbase.h>
#include <stdint.h>
#include <utility>
#include "base/location.h"
#include "base/strings/string_util.h"
#include "base/strings/utf_string_conversions.h"
#include "base/threading/scoped_thread_priority.h"
#include "base/win/scoped_bstr.h"
#include "base/win/scoped_variant.h"
using Microsoft::WRL::ComPtr;
namespace base {
namespace win {
bool CreateLocalWmiConnection(bool set_blanket,
ComPtr<IWbemServices>* wmi_services) {
// Mitigate the issues caused by loading DLLs on a background thread
// (http://crbug/973868).
SCOPED_MAY_LOAD_LIBRARY_AT_BACKGROUND_PRIORITY();
ComPtr<IWbemLocator> wmi_locator;
HRESULT hr =
::CoCreateInstance(CLSID_WbemLocator, nullptr, CLSCTX_INPROC_SERVER,
IID_PPV_ARGS(&wmi_locator));
if (FAILED(hr))
return false;
ComPtr<IWbemServices> wmi_services_r;
hr = wmi_locator->ConnectServer(ScopedBstr(L"ROOT\\CIMV2").Get(), nullptr,
nullptr, nullptr, 0, nullptr, nullptr,
&wmi_services_r);
if (FAILED(hr))
return false;
if (set_blanket) {
hr = ::CoSetProxyBlanket(wmi_services_r.Get(), RPC_C_AUTHN_WINNT,
RPC_C_AUTHZ_NONE, nullptr, RPC_C_AUTHN_LEVEL_CALL,
RPC_C_IMP_LEVEL_IMPERSONATE, nullptr, EOAC_NONE);
if (FAILED(hr))
return false;
}
*wmi_services = std::move(wmi_services_r);
return true;
}
bool CreateWmiClassMethodObject(IWbemServices* wmi_services,
WStringPiece class_name,
WStringPiece method_name,
ComPtr<IWbemClassObject>* class_instance) {
// We attempt to instantiate a COM object that represents a WMI object plus
// a method rolled into one entity.
ScopedBstr b_class_name(class_name);
ScopedBstr b_method_name(method_name);
ComPtr<IWbemClassObject> class_object;
HRESULT hr;
hr = wmi_services->GetObject(b_class_name.Get(), 0, nullptr, &class_object,
nullptr);
if (FAILED(hr))
return false;
ComPtr<IWbemClassObject> params_def;
hr = class_object->GetMethod(b_method_name.Get(), 0, ¶ms_def, nullptr);
if (FAILED(hr))
return false;
if (!params_def.Get()) {
// You hit this special case if the WMI class is not a CIM class. MSDN
// sometimes tells you this. Welcome to WMI hell.
return false;
}
hr = params_def->SpawnInstance(0, class_instance->GetAddressOf());
return SUCCEEDED(hr);
}
// The code in Launch() basically calls the Create Method of the Win32_Process
// CIM class is documented here:
// http://msdn2.microsoft.com/en-us/library/aa389388(VS.85).aspx
// NOTE: The documentation for the Create method suggests that the ProcessId
// parameter and return value are of type uint32_t, but when we call the method
// the values in the returned out_params, are VT_I4, which is int32_t.
bool WmiLaunchProcess(const std::wstring& command_line, int* process_id) {
ComPtr<IWbemServices> wmi_local;
if (!CreateLocalWmiConnection(true, &wmi_local))
return false;
static constexpr wchar_t class_name[] = L"Win32_Process";
static constexpr wchar_t method_name[] = L"Create";
ComPtr<IWbemClassObject> process_create;
if (!CreateWmiClassMethodObject(wmi_local.Get(), class_name, method_name,
&process_create)) {
return false;
}
ScopedVariant b_command_line(command_line.c_str());
if (FAILED(process_create->Put(L"CommandLine", 0, b_command_line.AsInput(),
0))) {
return false;
}
ComPtr<IWbemClassObject> out_params;
HRESULT hr = wmi_local->ExecMethod(
ScopedBstr(class_name).Get(), ScopedBstr(method_name).Get(), 0, nullptr,
process_create.Get(), &out_params, nullptr);
if (FAILED(hr))
return false;
// We're only expecting int32_t or uint32_t values, so no need for
// ScopedVariant.
VARIANT ret_value = {{{VT_EMPTY}}};
hr = out_params->Get(L"ReturnValue", 0, &ret_value, nullptr, nullptr);
if (FAILED(hr) || V_I4(&ret_value) != 0)
return false;
VARIANT pid = {{{VT_EMPTY}}};
hr = out_params->Get(L"ProcessId", 0, &pid, nullptr, nullptr);
if (FAILED(hr) || V_I4(&pid) == 0)
return false;
if (process_id)
*process_id = V_I4(&pid);
return true;
}
// static
WmiComputerSystemInfo WmiComputerSystemInfo::Get() {
ComPtr<IWbemServices> services;
WmiComputerSystemInfo info;
if (!CreateLocalWmiConnection(true, &services))
return info;
info.PopulateModelAndManufacturer(services);
info.PopulateSerialNumber(services);
return info;
}
void WmiComputerSystemInfo::PopulateModelAndManufacturer(
const ComPtr<IWbemServices>& services) {
static constexpr WStringPiece query_computer_system =
L"SELECT Manufacturer,Model FROM Win32_ComputerSystem";
ComPtr<IEnumWbemClassObject> enumerator_computer_system;
HRESULT hr = services->ExecQuery(
ScopedBstr(L"WQL").Get(), ScopedBstr(query_computer_system).Get(),
WBEM_FLAG_FORWARD_ONLY | WBEM_FLAG_RETURN_IMMEDIATELY, nullptr,
&enumerator_computer_system);
if (FAILED(hr) || !enumerator_computer_system.Get())
return;
ComPtr<IWbemClassObject> class_object;
ULONG items_returned = 0;
hr = enumerator_computer_system->Next(WBEM_INFINITE, 1, &class_object,
&items_returned);
if (FAILED(hr) || !items_returned)
return;
ScopedVariant manufacturer;
hr = class_object->Get(L"Manufacturer", 0, manufacturer.Receive(), nullptr,
nullptr);
if (SUCCEEDED(hr) && manufacturer.type() == VT_BSTR) {
manufacturer_.assign(V_BSTR(manufacturer.ptr()),
::SysStringLen(V_BSTR(manufacturer.ptr())));
}
ScopedVariant model;
hr = class_object->Get(L"Model", 0, model.Receive(), nullptr, nullptr);
if (SUCCEEDED(hr) && model.type() == VT_BSTR) {
model_.assign(V_BSTR(model.ptr()), ::SysStringLen(V_BSTR(model.ptr())));
}
}
void WmiComputerSystemInfo::PopulateSerialNumber(
const ComPtr<IWbemServices>& services) {
static constexpr WStringPiece query_bios =
L"SELECT SerialNumber FROM Win32_Bios";
ComPtr<IEnumWbemClassObject> enumerator_bios;
HRESULT hr = services->ExecQuery(
ScopedBstr(L"WQL").Get(), ScopedBstr(query_bios).Get(),
WBEM_FLAG_FORWARD_ONLY | WBEM_FLAG_RETURN_IMMEDIATELY, nullptr,
&enumerator_bios);
if (FAILED(hr) || !enumerator_bios.Get())
return;
ComPtr<IWbemClassObject> class_obj;
ULONG items_returned = 0;
hr = enumerator_bios->Next(WBEM_INFINITE, 1, &class_obj, &items_returned);
if (FAILED(hr) || !items_returned)
return;
ScopedVariant serial_number;
hr = class_obj->Get(L"SerialNumber", 0, serial_number.Receive(), nullptr,
nullptr);
if (SUCCEEDED(hr) && serial_number.type() == VT_BSTR) {
serial_number_.assign(V_BSTR(serial_number.ptr()),
::SysStringLen(V_BSTR(serial_number.ptr())));
}
}
} // namespace win
} // namespace base
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