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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 "chrome/installer/util/wmi.h"
#include <windows.h>
#include "base/basictypes.h"
#include "base/win/scoped_bstr.h"
#include "base/win/scoped_comptr.h"
#include "base/win/scoped_variant.h"
#pragma comment(lib, "wbemuuid.lib")
using base::win::ScopedVariant;
namespace installer {
bool WMI::CreateLocalConnection(bool set_blanket,
IWbemServices** wmi_services) {
base::win::ScopedComPtr<IWbemLocator> wmi_locator;
HRESULT hr = wmi_locator.CreateInstance(CLSID_WbemLocator, NULL,
CLSCTX_INPROC_SERVER);
if (FAILED(hr))
return false;
base::win::ScopedComPtr<IWbemServices> wmi_services_r;
hr = wmi_locator->ConnectServer(base::win::ScopedBstr(L"ROOT\\CIMV2"),
NULL, NULL, 0, NULL, 0, 0,
wmi_services_r.Receive());
if (FAILED(hr))
return false;
if (set_blanket) {
hr = ::CoSetProxyBlanket(wmi_services_r,
RPC_C_AUTHN_WINNT,
RPC_C_AUTHZ_NONE,
NULL,
RPC_C_AUTHN_LEVEL_CALL,
RPC_C_IMP_LEVEL_IMPERSONATE,
NULL,
EOAC_NONE);
if (FAILED(hr))
return false;
}
*wmi_services = wmi_services_r.Detach();
return true;
}
bool WMI::CreateClassMethodObject(IWbemServices* wmi_services,
const std::wstring& class_name,
const std::wstring& method_name,
IWbemClassObject** class_instance) {
// We attempt to instantiate a COM object that represents a WMI object plus
// a method rolled into one entity.
base::win::ScopedBstr b_class_name(class_name.c_str());
base::win::ScopedBstr b_method_name(method_name.c_str());
base::win::ScopedComPtr<IWbemClassObject> class_object;
HRESULT hr;
hr = wmi_services->GetObject(b_class_name, 0, NULL,
class_object.Receive(), NULL);
if (FAILED(hr))
return false;
base::win::ScopedComPtr<IWbemClassObject> params_def;
hr = class_object->GetMethod(b_method_name, 0, params_def.Receive(), NULL);
if (FAILED(hr))
return false;
if (NULL == params_def) {
// 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);
return(SUCCEEDED(hr));
}
bool SetParameter(IWbemClassObject* class_method,
const std::wstring& parameter_name, VARIANT* parameter) {
HRESULT hr = class_method->Put(parameter_name.c_str(), 0, parameter, 0);
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, but when we call the method
// the values in the returned out_params, are VT_I4, which is int32.
bool WMIProcess::Launch(const std::wstring& command_line, int* process_id) {
base::win::ScopedComPtr<IWbemServices> wmi_local;
if (!WMI::CreateLocalConnection(true, wmi_local.Receive()))
return false;
const wchar_t class_name[] = L"Win32_Process";
const wchar_t method_name[] = L"Create";
base::win::ScopedComPtr<IWbemClassObject> process_create;
if (!WMI::CreateClassMethodObject(wmi_local, class_name, method_name,
process_create.Receive()))
return false;
ScopedVariant b_command_line(command_line.c_str());
if (!SetParameter(process_create, L"CommandLine", b_command_line.AsInput()))
return false;
base::win::ScopedComPtr<IWbemClassObject> out_params;
HRESULT hr = wmi_local->ExecMethod(base::win::ScopedBstr(class_name),
base::win::ScopedBstr(method_name),
0, NULL, process_create,
out_params.Receive(), NULL);
if (FAILED(hr))
return false;
// We're only expecting int32 or uint32 values, so no need for ScopedVariant.
VARIANT ret_value = {VT_EMPTY};
hr = out_params->Get(L"ReturnValue", 0, &ret_value, NULL, 0);
if (FAILED(hr) || 0 != V_I4(&ret_value))
return false;
VARIANT pid = {VT_EMPTY};
hr = out_params->Get(L"ProcessId", 0, &pid, NULL, 0);
if (FAILED(hr) || 0 == V_I4(&pid))
return false;
if (process_id)
*process_id = V_I4(&pid);
return true;
}
string16 WMIComputerSystem::GetModel() {
base::win::ScopedComPtr<IWbemServices> services;
if (!WMI::CreateLocalConnection(true, services.Receive()))
return string16();
base::win::ScopedBstr query_language(L"WQL");
base::win::ScopedBstr query(L"SELECT * FROM Win32_ComputerSystem");
base::win::ScopedComPtr<IEnumWbemClassObject> enumerator;
HRESULT hr = services->ExecQuery(
query_language, query,
WBEM_FLAG_FORWARD_ONLY | WBEM_FLAG_RETURN_IMMEDIATELY, NULL,
enumerator.Receive());
if (FAILED(hr) || !enumerator)
return string16();
base::win::ScopedComPtr<IWbemClassObject> class_object;
ULONG items_returned = 0;
hr = enumerator->Next(WBEM_INFINITE, 1, class_object.Receive(),
&items_returned);
if (!items_returned)
return string16();
base::win::ScopedVariant manufacturer;
class_object->Get(L"Manufacturer", 0, manufacturer.Receive(), 0, 0);
base::win::ScopedVariant model;
class_object->Get(L"Model", 0, model.Receive(), 0, 0);
string16 model_string;
if (manufacturer.type() == VT_BSTR) {
model_string = V_BSTR(&manufacturer);
if (model.type() == VT_BSTR)
model_string += L" ";
}
if (model.type() == VT_BSTR)
model_string += V_BSTR(&model);
return model_string;
}
} // namespace installer
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