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/*
* os_win32/wmiquery.cpp
*
* Home page of code is: http://www.smartmontools.org
*
* Copyright (C) 2011-13 Christian Franke
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#include "config.h"
#define WINVER 0x0400
#define _WIN32_WINNT WINVER
#include "wmiquery.h"
#include <stdio.h>
const char * wmiquery_cpp_cvsid = "$Id: wmiquery.cpp 4760 2018-08-19 18:45:53Z chrfranke $"
WMIQUERY_H_CVSID;
/////////////////////////////////////////////////////////////////////////////
// com_bstr
com_bstr::com_bstr(const char * str)
: m_bstr(0)
{
int sz = MultiByteToWideChar(CP_ACP, MB_PRECOMPOSED, str, -1, (LPWSTR)0, 0);
if (sz <= 0)
return;
m_bstr = SysAllocStringLen((OLECHAR*)0, sz-1);
if (!m_bstr)
return; // throw std::bad_alloc
MultiByteToWideChar(CP_ACP, MB_PRECOMPOSED, str, -1, m_bstr, sz);
}
bool com_bstr::to_str(const BSTR & bstr, std::string & str)
{
if (!bstr)
return false;
int sz = WideCharToMultiByte(CP_ACP, 0, bstr, -1, (LPSTR)0, 0, (LPCSTR)0, (LPBOOL)0);
if (sz <= 0)
return false;
char * buf = new char[sz];
WideCharToMultiByte(CP_ACP, 0, bstr, -1, buf, sz, (LPCSTR)0, (LPBOOL)0);
str = buf;
delete [] buf;
return true;
}
/////////////////////////////////////////////////////////////////////////////
// wbem_object
std::string wbem_object::get_str(const char * name) /*const*/
{
std::string s;
if (!m_intf)
return s;
VARIANT var; VariantInit(&var);
if (m_intf->Get(com_bstr(name), 0L, &var, (CIMTYPE*)0, (LPLONG)0) /* != WBEM_S_NO_ERROR */)
return s;
if (var.vt == VT_BSTR)
com_bstr::to_str(var.bstrVal, s);
VariantClear(&var);
return s;
}
/////////////////////////////////////////////////////////////////////////////
// wbem_enumerator
bool wbem_enumerator::next(wbem_object & obj)
{
if (!m_intf)
return false;
ULONG n = 0;
HRESULT rc = m_intf->Next(5000 /*5s*/, 1 /*count*/, obj.m_intf.replace(), &n);
if (FAILED(rc) || n != 1)
return false;
return true;
}
/////////////////////////////////////////////////////////////////////////////
// wbem_services
const CLSID xCLSID_WbemLocator = {0x4590f811, 0x1d3a, 0x11d0, {0x89, 0x1f, 0x00, 0xaa, 0x00, 0x4b, 0x2e, 0x24}};
const IID xIID_IWbemLocator = {0xdc12a687, 0x737f, 0x11cf, {0x88, 0x4d, 0x00, 0xaa, 0x00, 0x4b, 0x2e, 0x24}};
bool wbem_services::connect()
{
// Init COM during first call.
static HRESULT init_rc = -1;
static bool init_tried = false;
if (!init_tried) {
init_tried = true;
init_rc = CoInitialize((LPVOID)0);
}
if (!(init_rc == S_OK || init_rc == S_FALSE))
return false;
/// Create locator.
com_intf_ptr<IWbemLocator> locator;
HRESULT rc = CoCreateInstance(xCLSID_WbemLocator, (LPUNKNOWN)0,
CLSCTX_INPROC_SERVER, xIID_IWbemLocator, (LPVOID*)locator.replace());
if (FAILED(rc))
return false;
// Set timeout flag if supported.
long flags = 0;
OSVERSIONINFOA ver; ver.dwOSVersionInfoSize = sizeof(ver);
if (GetVersionExA(&ver) && ver.dwPlatformId == VER_PLATFORM_WIN32_NT
&& ( ver.dwMajorVersion >= 6 // Vista
|| (ver.dwMajorVersion == 5 && ver.dwMinorVersion >= 1))) // XP
flags = WBEM_FLAG_CONNECT_USE_MAX_WAIT; // return in 2min or less
// Connect to local server.
rc = locator->ConnectServer(com_bstr("\\\\.\\root\\cimv2"),
(BSTR)0, (BSTR)0, (BSTR)0, // User, Password, Locale
flags, (BSTR)0, (IWbemContext*)0, m_intf.replace());
if (FAILED(rc))
return false;
// Set authentication information,
rc = CoSetProxyBlanket(m_intf.get(), RPC_C_AUTHN_WINNT, RPC_C_AUTHZ_NONE,
(OLECHAR*)0, RPC_C_AUTHN_LEVEL_CALL, RPC_C_IMP_LEVEL_IMPERSONATE,
(RPC_AUTH_IDENTITY_HANDLE*)0, EOAC_NONE);
if (FAILED(rc)) {
m_intf.reset();
return false;
}
return true;
}
bool wbem_services::vquery(wbem_enumerator & result, const char * qstr, va_list args) /*const*/
{
if (!m_intf)
return false;
char qline[1024];
vsnprintf(qline, sizeof(qline), qstr, args);
qline[sizeof(qline)-1] = 0;
HRESULT rc = m_intf->ExecQuery(
com_bstr("WQL"), com_bstr(qline),
WBEM_FLAG_FORWARD_ONLY | WBEM_FLAG_RETURN_IMMEDIATELY,
(IWbemContext*)0, result.m_intf.replace());
if (FAILED(rc))
return false;
return true;
}
bool wbem_services::vquery1(wbem_object & obj, const char * qstr, va_list args) /*const*/
{
wbem_enumerator result;
if (!vquery(result, qstr, args))
return false;
if (!result.next(obj))
return false;
wbem_object peek;
if (result.next(peek))
return false;
return true;
}
bool wbem_services::query(wbem_enumerator & result, const char * qstr, ...) /*const*/
{
va_list args; va_start(args, qstr);
bool ok = vquery(result, qstr, args);
va_end(args);
return ok;
}
bool wbem_services::query1(wbem_object & obj, const char * qstr, ...) /*const*/
{
va_list args; va_start(args, qstr);
bool ok = vquery1(obj, qstr, args);
va_end(args);
return ok;
}
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