1: /*
2: * os_win32/wmiquery.cpp
3: *
4: * Home page of code is: http://smartmontools.sourceforge.net
5: *
6: * Copyright (C) 2011 Christian Franke <smartmontools-support@lists.sourceforge.net>
7: *
8: * This program is free software; you can redistribute it and/or modify
9: * it under the terms of the GNU General Public License as published by
10: * the Free Software Foundation; either version 2, or (at your option)
11: * any later version.
12: *
13: * You should have received a copy of the GNU General Public License
14: * (for example COPYING); If not, see <http://www.gnu.org/licenses/>.
15: *
16: */
17:
18: #include "config.h"
19: #define WINVER 0x0400
20: #define _WIN32_WINNT WINVER
21:
22: #include "wmiquery.h"
23:
24: #include <stdio.h>
25:
26: const char * wmiquery_cpp_cvsid = "$Id: wmiquery.cpp,v 1.1.1.1 2012/02/21 16:32:16 misho Exp $"
27: WMIQUERY_H_CVSID;
28:
29:
30: /////////////////////////////////////////////////////////////////////////////
31: // com_bstr
32:
33: com_bstr::com_bstr(const char * str)
34: : m_bstr(0)
35: {
36: int sz = MultiByteToWideChar(CP_ACP, MB_PRECOMPOSED, str, -1, (LPWSTR)0, 0);
37: if (sz <= 0)
38: return;
39: m_bstr = SysAllocStringLen((OLECHAR*)0, sz-1);
40: if (!m_bstr)
41: return; // throw std::bad_alloc
42: MultiByteToWideChar(CP_ACP, MB_PRECOMPOSED, str, -1, m_bstr, sz);
43: }
44:
45: bool com_bstr::to_str(const BSTR & bstr, std::string & str)
46: {
47: if (!bstr)
48: return false;
49: int sz = WideCharToMultiByte(CP_ACP, 0, bstr, -1, (LPSTR)0, 0, (LPCSTR)0, (LPBOOL)0);
50: if (sz <= 0)
51: return false;
52: char * buf = new char[sz];
53: WideCharToMultiByte(CP_ACP, 0, bstr, -1, buf, sz, (LPCSTR)0, (LPBOOL)0);
54: str = buf;
55: delete [] buf;
56: return true;
57: }
58:
59:
60: /////////////////////////////////////////////////////////////////////////////
61: // wbem_object
62:
63: std::string wbem_object::get_str(const char * name) /*const*/
64: {
65: std::string s;
66: if (!m_intf)
67: return s;
68:
69: VARIANT var; VariantInit(&var);
70: if (m_intf->Get(com_bstr(name), 0L, &var, (CIMTYPE*)0, (long*)0) /* != WBEM_S_NO_ERROR */)
71: return s;
72:
73: if (var.vt == VT_BSTR)
74: com_bstr::to_str(var.bstrVal, s);
75: VariantClear(&var);
76: return s;
77: }
78:
79:
80: /////////////////////////////////////////////////////////////////////////////
81: // wbem_enumerator
82:
83: bool wbem_enumerator::next(wbem_object & obj)
84: {
85: if (!m_intf)
86: return false;
87:
88: ULONG n = 0;
89: HRESULT rc = m_intf->Next(5000 /*5s*/, 1 /*count*/, obj.m_intf.replace(), &n);
90: if (FAILED(rc) || n != 1)
91: return false;
92: return true;
93: }
94:
95:
96: /////////////////////////////////////////////////////////////////////////////
97: // wbem_services
98:
99: const CLSID xCLSID_WbemLocator = {0x4590f811, 0x1d3a, 0x11d0, {0x89, 0x1f, 0x00, 0xaa, 0x00, 0x4b, 0x2e, 0x24}};
100: const IID xIID_IWbemLocator = {0xdc12a687, 0x737f, 0x11cf, {0x88, 0x4d, 0x00, 0xaa, 0x00, 0x4b, 0x2e, 0x24}};
101:
102: bool wbem_services::connect()
103: {
104: // Init COM during first call.
105: static HRESULT init_rc = -1;
106: static bool init_tried = false;
107: if (!init_tried) {
108: init_tried = true;
109: init_rc = CoInitialize((LPVOID)0);
110: }
111: if (!(init_rc == S_OK || init_rc == S_FALSE))
112: return false;
113:
114: /// Create locator.
115: com_intf_ptr<IWbemLocator> locator;
116: HRESULT rc = CoCreateInstance(xCLSID_WbemLocator, (LPUNKNOWN)0,
117: CLSCTX_INPROC_SERVER, xIID_IWbemLocator, (LPVOID*)locator.replace());
118: if (FAILED(rc))
119: return false;
120:
121: // Set timeout flag if supported.
122: long flags = 0;
123: OSVERSIONINFOA ver; ver.dwOSVersionInfoSize = sizeof(ver);
124: if (GetVersionExA(&ver) && ver.dwPlatformId == VER_PLATFORM_WIN32_NT
125: && ( ver.dwMajorVersion >= 6 // Vista
126: || (ver.dwMajorVersion == 5 && ver.dwMinorVersion >= 1))) // XP
127: flags = WBEM_FLAG_CONNECT_USE_MAX_WAIT; // return in 2min or less
128:
129: // Connect to local server.
130: rc = locator->ConnectServer(com_bstr("\\\\.\\root\\cimv2"),
131: (BSTR)0, (BSTR)0, (BSTR)0, // User, Password, Locale
132: flags, (BSTR)0, (IWbemContext*)0, m_intf.replace());
133: if (FAILED(rc))
134: return false;
135:
136: // Set authentication information,
137: rc = CoSetProxyBlanket(m_intf.get(), RPC_C_AUTHN_WINNT, RPC_C_AUTHZ_NONE,
138: (OLECHAR*)0, RPC_C_AUTHN_LEVEL_CALL, RPC_C_IMP_LEVEL_IMPERSONATE,
139: (RPC_AUTH_IDENTITY_HANDLE*)0, EOAC_NONE);
140: if (FAILED(rc)) {
141: m_intf.reset();
142: return false;
143: }
144:
145: return true;
146: }
147:
148: bool wbem_services::vquery(wbem_enumerator & result, const char * qstr, va_list args) /*const*/
149: {
150: if (!m_intf)
151: return false;
152:
153: char qline[1024];
154: vsnprintf(qline, sizeof(qline), qstr, args);
155: qline[sizeof(qline)-1] = 0;
156:
157: HRESULT rc = m_intf->ExecQuery(
158: com_bstr("WQL"), com_bstr(qline),
159: WBEM_FLAG_FORWARD_ONLY | WBEM_FLAG_RETURN_IMMEDIATELY,
160: (IWbemContext*)0, result.m_intf.replace());
161: if (FAILED(rc))
162: return false;
163:
164: return true;
165: }
166:
167: bool wbem_services::vquery1(wbem_object & obj, const char * qstr, va_list args) /*const*/
168: {
169: wbem_enumerator result;
170: if (!vquery(result, qstr, args))
171: return false;
172:
173: if (!result.next(obj))
174: return false;
175:
176: wbem_object peek;
177: if (result.next(peek))
178: return false;
179:
180: return true;
181: }
182:
183: bool wbem_services::query(wbem_enumerator & result, const char * qstr, ...) /*const*/
184: {
185: va_list args; va_start(args, qstr);
186: bool ok = vquery(result, qstr, args);
187: va_end(args);
188: return ok;
189: }
190:
191: bool wbem_services::query1(wbem_object & obj, const char * qstr, ...) /*const*/
192: {
193: va_list args; va_start(args, qstr);
194: bool ok = vquery1(obj, qstr, args);
195: va_end(args);
196: return ok;
197: }
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