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// Copyright (c) 2006-2008 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 <windows.h>
#include "base/basictypes.h"
#include "base/scoped_bstr_win.h"
#include "base/scoped_comptr_win.h"
#pragma comment(lib, "wbemuuid.lib")
#include "base/wmi_util.h"
namespace {
// Simple class to manage the lifetime of a variant.
// TODO(tommi): Replace this for a more useful class.
class VariantHelper : public VARIANT {
public:
VariantHelper() {
vt = VT_EMPTY;
}
explicit VariantHelper(VARTYPE type) {
vt = type;
}
~VariantHelper() {
::VariantClear(this);
}
private:
DISALLOW_COPY_AND_ASSIGN(VariantHelper);
};
} // namespace
bool WMIUtil::CreateLocalConnection(bool set_blanket,
IWbemServices** wmi_services) {
ScopedComPtr<IWbemLocator> wmi_locator;
HRESULT hr = wmi_locator.CreateInstance(CLSID_WbemLocator, NULL,
CLSCTX_INPROC_SERVER);
if (FAILED(hr))
return false;
ScopedComPtr<IWbemServices> wmi_services_r;
hr = wmi_locator->ConnectServer(StackBstr(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 WMIUtil::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.
ScopedBstr b_class_name(class_name.c_str());
ScopedBstr b_method_name(method_name.c_str());
ScopedComPtr<IWbemClassObject> class_object;
HRESULT hr;
hr = wmi_services->GetObject(b_class_name, 0, NULL,
class_object.Receive(), NULL);
if (FAILED(hr))
return false;
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
bool WMIProcessUtil::Launch(const std::wstring& command_line, int* process_id) {
ScopedComPtr<IWbemServices> wmi_local;
if (!WMIUtil::CreateLocalConnection(true, wmi_local.Receive()))
return false;
const wchar_t class_name[] = L"Win32_Process";
const wchar_t method_name[] = L"Create";
ScopedComPtr<IWbemClassObject> process_create;
if (!WMIUtil::CreateClassMethodObject(wmi_local, class_name, method_name,
process_create.Receive()))
return false;
VariantHelper b_command_line(VT_BSTR);
b_command_line.bstrVal = ::SysAllocString(command_line.c_str());
if (!SetParameter(process_create, L"CommandLine", &b_command_line))
return false;
ScopedComPtr<IWbemClassObject> out_params;
HRESULT hr = wmi_local->ExecMethod(StackBstr(class_name),
StackBstr(method_name), 0, NULL,
process_create, out_params.Receive(),
NULL);
if (FAILED(hr))
return false;
VariantHelper ret_value;
hr = out_params->Get(L"ReturnValue", 0, &ret_value, NULL, 0);
if (FAILED(hr) || (0 != ret_value.uintVal))
return false;
VariantHelper pid;
hr = out_params->Get(L"ProcessId", 0, &pid, NULL, 0);
if (FAILED(hr) || (0 == pid.intVal))
return false;
if (process_id)
*process_id = pid.intVal;
return true;
}
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