VDPlugin.cpp@ 83043

Last change on this file since 83043 was 82968, checked in by vboxsync, 5 years ago
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1	/* $Id: VDPlugin.cpp 82968 2020-02-04 10:35:17Z vboxsync $ */
2	/** @file
3	* VD - Virtual disk container implementation, plugin related bits.
4	*/
5
6	/*
7	* Copyright (C) 2017-2020 Oracle Corporation
8	*
9	* This file is part of VirtualBox Open Source Edition (OSE), as
10	* available from http://www.virtualbox.org. This file is free software;
11	* you can redistribute it and/or modify it under the terms of the GNU
12	* General Public License (GPL) as published by the Free Software
13	* Foundation, in version 2 as it comes in the "COPYING" file of the
14	* VirtualBox OSE distribution. VirtualBox OSE is distributed in the
15	* hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
16	*/
17
18
19	/*********************************************************************************************************************************
20	* Header Files *
21	*********************************************************************************************************************************/
22	#define LOG_GROUP LOG_GROUP_VD
23	#include <VBox/err.h>
24	#include <VBox/sup.h>
25	#include <VBox/log.h>
26	#include <VBox/vd-plugin.h>
27
28	#include <iprt/dir.h>
29	#include <iprt/ldr.h>
30	#include <iprt/mem.h>
31	#include <iprt/path.h>
32
33	#include "VDInternal.h"
34	#include "VDBackends.h"
35
36
37	/*********************************************************************************************************************************
38	* Structures and Typedefs *
39	*********************************************************************************************************************************/
40
41	/**
42	* Plugin structure.
43	*/
44	typedef struct VDPLUGIN
45	{
46	/** Pointer to the next plugin structure. */
47	RTLISTNODE NodePlugin;
48	/** Handle of loaded plugin library. */
49	RTLDRMOD hPlugin;
50	/** Filename of the loaded plugin. */
51	char *pszFilename;
52	} VDPLUGIN;
53	/** Pointer to a plugin structure. */
54	typedef VDPLUGIN *PVDPLUGIN;
55
56
57	/*********************************************************************************************************************************
58	* Defined Constants And Macros *
59	*********************************************************************************************************************************/
60
61
62	/*********************************************************************************************************************************
63	* Global Variables *
64	*********************************************************************************************************************************/
65
66	#ifndef VBOX_HDD_NO_DYNAMIC_BACKENDS
67	/** Head of loaded plugin list. */
68	static RTLISTANCHOR g_ListPluginsLoaded;
69	#endif
70
71	/** Number of image backends supported. */
72	static unsigned g_cBackends = 0;
73	/** Array of pointers to the image backends. */
74	static PCVDIMAGEBACKEND *g_apBackends = NULL;
75	#ifndef VBOX_HDD_NO_DYNAMIC_BACKENDS
76	/** Array of handles to the corresponding plugin. */
77	static RTLDRMOD *g_ahBackendPlugins = NULL;
78	#endif
79	/**
80	* Builtin image backends.
81	*
82	* @note As long as the pfnProb() calls aren't scored, the ordering influences
83	* which backend take precedence. In particular, the RAW backend should
84	* be thowards the end of the list.
85	*/
86	static PCVDIMAGEBACKEND aStaticBackends[] =
87	{
88	&g_VmdkBackend,
89	&g_VDIBackend,
90	&g_VhdBackend,
91	&g_ParallelsBackend,
92	&g_DmgBackend,
93	&g_QedBackend,
94	&g_QCowBackend,
95	&g_VhdxBackend,
96	&g_CueBackend,
97	&g_VBoxIsoMakerBackend,
98	&g_RawBackend,
99	&g_ISCSIBackend
100	};
101
102	/** Number of supported cache backends. */
103	static unsigned g_cCacheBackends = 0;
104	/** Array of pointers to the cache backends. */
105	static PCVDCACHEBACKEND *g_apCacheBackends = NULL;
106	#ifndef VBOX_HDD_NO_DYNAMIC_BACKENDS
107	/** Array of handles to the corresponding plugin.
108	*
109	* @todo r=bird: This looks rather pointless.
110	*/
111	static RTLDRMOD *g_ahCacheBackendPlugins = NULL;
112	#endif
113	/** Builtin cache backends. */
114	static PCVDCACHEBACKEND aStaticCacheBackends[] =
115	{
116	&g_VciCacheBackend
117	};
118
119	/** Number of supported filter backends. */
120	static unsigned g_cFilterBackends = 0;
121	/** Array of pointers to the filters backends. */
122	static PCVDFILTERBACKEND *g_apFilterBackends = NULL;
123	#ifndef VBOX_HDD_NO_DYNAMIC_BACKENDS
124	/** Array of handles to the corresponding plugin. */
125	static PRTLDRMOD g_pahFilterBackendPlugins = NULL;
126	#endif
127
128
129	/*********************************************************************************************************************************
130	* Internal Functions *
131	*********************************************************************************************************************************/
132
133	/**
134	* Add an array of image format backends from the given plugin to the list of known
135	* image formats.
136	*
137	* @returns VBox status code.
138	* @param hPlugin The plugin handle the backends belong to, can be NIL_RTLDRMOD
139	* for compiled in backends.
140	* @param ppBackends The array of image backend descriptors to add.
141	* @param cBackends Number of descriptors in the array.
142	*/
143	static int vdAddBackends(RTLDRMOD hPlugin, PCVDIMAGEBACKEND *ppBackends, unsigned cBackends)
144	{
145	PCVDIMAGEBACKEND pTmp = (PCVDIMAGEBACKEND )RTMemRealloc(g_apBackends,
146	(g_cBackends + cBackends) * sizeof(PCVDIMAGEBACKEND));
147	if (RT_UNLIKELY(!pTmp))
148	return VERR_NO_MEMORY;
149	g_apBackends = pTmp;
150	memcpy(&g_apBackends[g_cBackends], ppBackends, cBackends * sizeof(PCVDIMAGEBACKEND));
151
152	#ifndef VBOX_HDD_NO_DYNAMIC_BACKENDS
153	RTLDRMOD pTmpPlugins = (RTLDRMOD)RTMemRealloc(g_ahBackendPlugins,
154	(g_cBackends + cBackends) * sizeof(RTLDRMOD));
155	if (RT_UNLIKELY(!pTmpPlugins))
156	return VERR_NO_MEMORY;
157	g_ahBackendPlugins = pTmpPlugins;
158	for (unsigned i = g_cBackends; i < g_cBackends + cBackends; i++)
159	g_ahBackendPlugins[i] = hPlugin;
160	#else
161	RT_NOREF(hPlugin);
162	#endif
163
164	g_cBackends += cBackends;
165	return VINF_SUCCESS;
166	}
167
168
169	/**
170	* Add an array of cache format backends from the given plugin to the list of known
171	* cache formats.
172	*
173	* @returns VBox status code.
174	* @param hPlugin The plugin handle the backends belong to, can be NIL_RTLDRMOD
175	* for compiled in backends.
176	* @param ppBackends The array of cache backend descriptors to add.
177	* @param cBackends Number of descriptors in the array.
178	*/
179	static int vdAddCacheBackends(RTLDRMOD hPlugin, PCVDCACHEBACKEND *ppBackends, unsigned cBackends)
180	{
181	PCVDCACHEBACKEND pTmp = (PCVDCACHEBACKEND)RTMemReallocTag(g_apCacheBackends,
182	(g_cCacheBackends + cBackends) * sizeof(PCVDCACHEBACKEND),
183	"may-leak:vdAddCacheBackend");
184	if (RT_UNLIKELY(!pTmp))
185	return VERR_NO_MEMORY;
186	g_apCacheBackends = pTmp;
187	memcpy(&g_apCacheBackends[g_cCacheBackends], ppBackends, cBackends * sizeof(PCVDCACHEBACKEND));
188
189	#ifndef VBOX_HDD_NO_DYNAMIC_BACKENDS
190	RTLDRMOD pTmpPlugins = (RTLDRMOD)RTMemReallocTag(g_ahCacheBackendPlugins,
191	(g_cCacheBackends + cBackends) * sizeof(RTLDRMOD),
192	"may-leak:vdAddCacheBackend");
193	if (RT_UNLIKELY(!pTmpPlugins))
194	return VERR_NO_MEMORY;
195	g_ahCacheBackendPlugins = pTmpPlugins;
196	for (unsigned i = g_cCacheBackends; i < g_cCacheBackends + cBackends; i++)
197	g_ahCacheBackendPlugins[i] = hPlugin;
198	#else
199	RT_NOREF(hPlugin);
200	#endif
201
202	g_cCacheBackends += cBackends;
203	return VINF_SUCCESS;
204	}
205
206	#ifndef VBOX_HDD_NO_DYNAMIC_BACKENDS
207	/**
208	* Add a single image format backend to the list of known image formats.
209	*
210	* @returns VBox status code.
211	* @param hPlugin The plugin handle the backend belongs to, can be NIL_RTLDRMOD
212	* for compiled in backends.
213	* @param pBackend The image backend descriptors to add.
214	*/
215	DECLINLINE(int) vdAddBackend(RTLDRMOD hPlugin, PCVDIMAGEBACKEND pBackend)
216	{
217	return vdAddBackends(hPlugin, &pBackend, 1);
218	}
219
220
221	/**
222	* Add a single cache format backend to the list of known cache formats.
223	*
224	* @returns VBox status code.
225	* @param hPlugin The plugin handle the backend belongs to, can be NIL_RTLDRMOD
226	* for compiled in backends.
227	* @param pBackend The cache backend descriptors to add.
228	*/
229	DECLINLINE(int) vdAddCacheBackend(RTLDRMOD hPlugin, PCVDCACHEBACKEND pBackend)
230	{
231	return vdAddCacheBackends(hPlugin, &pBackend, 1);
232	}
233
234
235	/**
236	* Add several filter backends.
237	*
238	* @returns VBox status code.
239	* @param hPlugin Plugin handle to add.
240	* @param ppBackends Array of filter backends to add.
241	* @param cBackends Number of backends to add.
242	*/
243	static int vdAddFilterBackends(RTLDRMOD hPlugin, PCVDFILTERBACKEND *ppBackends, unsigned cBackends)
244	{
245	PCVDFILTERBACKEND pTmp = (PCVDFILTERBACKEND )RTMemRealloc(g_apFilterBackends,
246	(g_cFilterBackends + cBackends) * sizeof(PCVDFILTERBACKEND));
247	if (RT_UNLIKELY(!pTmp))
248	return VERR_NO_MEMORY;
249	g_apFilterBackends = pTmp;
250
251	#ifndef VBOX_HDD_NO_DYNAMIC_BACKENDS
252	PRTLDRMOD pTmpPlugins = (PRTLDRMOD)RTMemRealloc(g_pahFilterBackendPlugins,
253	(g_cFilterBackends + cBackends) * sizeof(RTLDRMOD));
254	if (RT_UNLIKELY(!pTmpPlugins))
255	return VERR_NO_MEMORY;
256
257	g_pahFilterBackendPlugins = pTmpPlugins;
258	memcpy(&g_apFilterBackends[g_cFilterBackends], ppBackends, cBackends * sizeof(PCVDFILTERBACKEND));
259	for (unsigned i = g_cFilterBackends; i < g_cFilterBackends + cBackends; i++)
260	g_pahFilterBackendPlugins[i] = hPlugin;
261	#else
262	RT_NOREF(hPlugin);
263	#endif
264
265	g_cFilterBackends += cBackends;
266	return VINF_SUCCESS;
267	}
268
269
270	/**
271	* Add a single filter backend to the list of supported filters.
272	*
273	* @returns VBox status code.
274	* @param hPlugin Plugin handle to add.
275	* @param pBackend The backend to add.
276	*/
277	DECLINLINE(int) vdAddFilterBackend(RTLDRMOD hPlugin, PCVDFILTERBACKEND pBackend)
278	{
279	return vdAddFilterBackends(hPlugin, &pBackend, 1);
280	}
281
282	/**
283	* @interface_method_impl{VDBACKENDREGISTER,pfnRegisterImage}
284	*/
285	static DECLCALLBACK(int) vdPluginRegisterImage(void *pvUser, PCVDIMAGEBACKEND pBackend)
286	{
287	int rc = VINF_SUCCESS;
288
289	if (VD_VERSION_ARE_COMPATIBLE(VD_IMGBACKEND_VERSION, pBackend->u32Version))
290	vdAddBackend((RTLDRMOD)pvUser, pBackend);
291	else
292	{
293	LogFunc(("ignored plugin: pBackend->u32Version=%u rc=%Rrc\n", pBackend->u32Version, rc));
294	rc = VERR_IGNORED;
295	}
296
297	return rc;
298	}
299
300	/**
301	* @interface_method_impl{VDBACKENDREGISTER,pfnRegisterCache}
302	*/
303	static DECLCALLBACK(int) vdPluginRegisterCache(void *pvUser, PCVDCACHEBACKEND pBackend)
304	{
305	int rc = VINF_SUCCESS;
306
307	if (VD_VERSION_ARE_COMPATIBLE(VD_CACHEBACKEND_VERSION, pBackend->u32Version))
308	vdAddCacheBackend((RTLDRMOD)pvUser, pBackend);
309	else
310	{
311	LogFunc(("ignored plugin: pBackend->u32Version=%u rc=%Rrc\n", pBackend->u32Version, rc));
312	rc = VERR_IGNORED;
313	}
314
315	return rc;
316	}
317
318	/**
319	* @interface_method_impl{VDBACKENDREGISTER,pfnRegisterFilter}
320	*/
321	static DECLCALLBACK(int) vdPluginRegisterFilter(void *pvUser, PCVDFILTERBACKEND pBackend)
322	{
323	int rc = VINF_SUCCESS;
324
325	if (VD_VERSION_ARE_COMPATIBLE(VD_FLTBACKEND_VERSION, pBackend->u32Version))
326	vdAddFilterBackend((RTLDRMOD)pvUser, pBackend);
327	else
328	{
329	LogFunc(("ignored plugin: pBackend->u32Version=%u rc=%Rrc\n", pBackend->u32Version, rc));
330	rc = VERR_IGNORED;
331	}
332
333	return rc;
334	}
335
336	/**
337	* Checks whether the given plugin filename was already loaded.
338	*
339	* @returns Pointer to already loaded plugin, NULL if not found.
340	* @param pszFilename The filename to check.
341	*/
342	static PVDPLUGIN vdPluginFind(const char *pszFilename)
343	{
344	PVDPLUGIN pIt;
345	RTListForEach(&g_ListPluginsLoaded, pIt, VDPLUGIN, NodePlugin)
346	{
347	if (!RTStrCmp(pIt->pszFilename, pszFilename))
348	return pIt;
349	}
350
351	return NULL;
352	}
353
354	/**
355	* Adds a plugin to the list of loaded plugins.
356	*
357	* @returns VBox status code.
358	* @param hPlugin Plugin handle to add.
359	* @param pszFilename The associated filename, used for finding duplicates.
360	*/
361	static int vdAddPlugin(RTLDRMOD hPlugin, const char *pszFilename)
362	{
363	int rc = VINF_SUCCESS;
364	PVDPLUGIN pPlugin = (PVDPLUGIN)RTMemAllocZ(sizeof(VDPLUGIN));
365
366	if (pPlugin)
367	{
368	pPlugin->hPlugin = hPlugin;
369	pPlugin->pszFilename = RTStrDup(pszFilename);
370	if (pPlugin->pszFilename)
371	RTListAppend(&g_ListPluginsLoaded, &pPlugin->NodePlugin);
372	else
373	{
374	RTMemFree(pPlugin);
375	rc = VERR_NO_MEMORY;
376	}
377	}
378	else
379	rc = VERR_NO_MEMORY;
380
381	return rc;
382	}
383
384	/**
385	* Removes a single plugin given by the filename.
386	*
387	* @returns VBox status code.
388	* @param pszFilename The plugin filename to remove.
389	*/
390	static int vdRemovePlugin(const char *pszFilename)
391	{
392	/* Find plugin to be removed from the list. */
393	PVDPLUGIN pIt = vdPluginFind(pszFilename);
394	if (!pIt)
395	return VINF_SUCCESS;
396
397	/** @todo r=klaus: need to add a plugin entry point for unregistering the
398	* backends. Only if this doesn't exist (or fails to work) we should fall
399	* back to the following uncoordinated backend cleanup. */
400	for (unsigned i = 0; i < g_cBackends; i++)
401	{
402	while (i < g_cBackends && g_ahBackendPlugins[i] == pIt->hPlugin)
403	{
404	memmove(&g_apBackends[i], &g_apBackends[i + 1], (g_cBackends - i - 1) * sizeof(PCVDIMAGEBACKEND));
405	memmove(&g_ahBackendPlugins[i], &g_ahBackendPlugins[i + 1], (g_cBackends - i - 1) * sizeof(RTLDRMOD));
406	/** @todo for now skip reallocating, doesn't save much */
407	g_cBackends--;
408	}
409	}
410	for (unsigned i = 0; i < g_cCacheBackends; i++)
411	{
412	while (i < g_cCacheBackends && g_ahCacheBackendPlugins[i] == pIt->hPlugin)
413	{
414	memmove(&g_apCacheBackends[i], &g_apCacheBackends[i + 1], (g_cCacheBackends - i - 1) * sizeof(PCVDCACHEBACKEND));
415	memmove(&g_ahCacheBackendPlugins[i], &g_ahCacheBackendPlugins[i + 1], (g_cCacheBackends - i - 1) * sizeof(RTLDRMOD));
416	/** @todo for now skip reallocating, doesn't save much */
417	g_cCacheBackends--;
418	}
419	}
420	for (unsigned i = 0; i < g_cFilterBackends; i++)
421	{
422	while (i < g_cFilterBackends && g_pahFilterBackendPlugins[i] == pIt->hPlugin)
423	{
424	memmove(&g_apFilterBackends[i], &g_apFilterBackends[i + 1], (g_cFilterBackends - i - 1) * sizeof(PCVDFILTERBACKEND));
425	memmove(&g_pahFilterBackendPlugins[i], &g_pahFilterBackendPlugins[i + 1], (g_cFilterBackends - i - 1) * sizeof(RTLDRMOD));
426	/** @todo for now skip reallocating, doesn't save much */
427	g_cFilterBackends--;
428	}
429	}
430
431	/* Remove the plugin node now, all traces of it are gone. */
432	RTListNodeRemove(&pIt->NodePlugin);
433	RTLdrClose(pIt->hPlugin);
434	RTStrFree(pIt->pszFilename);
435	RTMemFree(pIt);
436
437	return VINF_SUCCESS;
438	}
439
440	#endif /* VBOX_HDD_NO_DYNAMIC_BACKENDS*/
441
442	/**
443	* Returns the number of known image format backends.
444	*
445	* @returns Number of image formats known.
446	*/
447	DECLHIDDEN(uint32_t) vdGetImageBackendCount(void)
448	{
449	return g_cBackends;
450	}
451
452
453	/**
454	* Queries a image backend descriptor by the index.
455	*
456	* @returns VBox status code.
457	* @param idx The index of the backend to query.
458	* @param ppBackend Where to store the pointer to the backend descriptor on success.
459	*/
460	DECLHIDDEN(int) vdQueryImageBackend(uint32_t idx, PCVDIMAGEBACKEND *ppBackend)
461	{
462	if (idx >= g_cBackends)
463	return VERR_OUT_OF_RANGE;
464
465	*ppBackend = g_apBackends[idx];
466	return VINF_SUCCESS;
467	}
468
469
470	/**
471	* Returns the image backend descriptor matching the given identifier if known.
472	*
473	* @returns VBox status code.
474	* @param pszBackend The backend identifier to look for.
475	* @param ppBackend Where to store the pointer to the backend descriptor on success.
476	*/
477	DECLHIDDEN(int) vdFindImageBackend(const char pszBackend, PCVDIMAGEBACKEND ppBackend)
478	{
479	int rc = VINF_SUCCESS;
480	PCVDIMAGEBACKEND pBackend = NULL;
481
482	if (!g_apBackends)
483	VDInit();
484
485	for (unsigned i = 0; i < g_cBackends; i++)
486	{
487	if (!RTStrICmp(pszBackend, g_apBackends[i]->pszBackendName))
488	{
489	pBackend = g_apBackends[i];
490	break;
491	}
492	}
493	*ppBackend = pBackend;
494	return rc;
495	}
496
497	/**
498	* Returns the number of known cache format backends.
499	*
500	* @returns Number of image formats known.
501	*/
502	DECLHIDDEN(uint32_t) vdGetCacheBackendCount(void)
503	{
504	return g_cCacheBackends;
505	}
506
507
508	/**
509	* Queries a cache backend descriptor by the index.
510	*
511	* @returns VBox status code.
512	* @param idx The index of the backend to query.
513	* @param ppBackend Where to store the pointer to the backend descriptor on success.
514	*/
515	DECLHIDDEN(int) vdQueryCacheBackend(uint32_t idx, PCVDCACHEBACKEND *ppBackend)
516	{
517	if (idx >= g_cCacheBackends)
518	return VERR_OUT_OF_RANGE;
519
520	*ppBackend = g_apCacheBackends[idx];
521	return VINF_SUCCESS;
522	}
523
524
525	/**
526	* Returns the cache backend descriptor matching the given identifier if known.
527	*
528	* @returns VBox status code.
529	* @param pszBackend The backend identifier to look for.
530	* @param ppBackend Where to store the pointer to the backend descriptor on success.
531	*/
532	DECLHIDDEN(int) vdFindCacheBackend(const char pszBackend, PCVDCACHEBACKEND ppBackend)
533	{
534	int rc = VINF_SUCCESS;
535	PCVDCACHEBACKEND pBackend = NULL;
536
537	if (!g_apCacheBackends)
538	VDInit();
539
540	for (unsigned i = 0; i < g_cCacheBackends; i++)
541	{
542	if (!RTStrICmp(pszBackend, g_apCacheBackends[i]->pszBackendName))
543	{
544	pBackend = g_apCacheBackends[i];
545	break;
546	}
547	}
548	*ppBackend = pBackend;
549	return rc;
550	}
551
552
553	/**
554	* Returns the number of known filter backends.
555	*
556	* @returns Number of image formats known.
557	*/
558	DECLHIDDEN(uint32_t) vdGetFilterBackendCount(void)
559	{
560	return g_cFilterBackends;
561	}
562
563
564	/**
565	* Queries a filter backend descriptor by the index.
566	*
567	* @returns VBox status code.
568	* @param idx The index of the backend to query.
569	* @param ppBackend Where to store the pointer to the backend descriptor on success.
570	*/
571	DECLHIDDEN(int) vdQueryFilterBackend(uint32_t idx, PCVDFILTERBACKEND *ppBackend)
572	{
573	if (idx >= g_cFilterBackends)
574	return VERR_OUT_OF_RANGE;
575
576	*ppBackend = g_apFilterBackends[idx];
577	return VINF_SUCCESS;
578	}
579
580
581	/**
582	* Returns the filter backend descriptor matching the given identifier if known.
583	*
584	* @returns VBox status code.
585	* @param pszFilter The filter identifier to look for.
586	* @param ppBackend Where to store the pointer to the backend descriptor on success.
587	*/
588	DECLHIDDEN(int) vdFindFilterBackend(const char pszFilter, PCVDFILTERBACKEND ppBackend)
589	{
590	int rc = VINF_SUCCESS;
591	PCVDFILTERBACKEND pBackend = NULL;
592
593	for (unsigned i = 0; i < g_cFilterBackends; i++)
594	{
595	if (!RTStrICmp(pszFilter, g_apFilterBackends[i]->pszBackendName))
596	{
597	pBackend = g_apFilterBackends[i];
598	break;
599	}
600	}
601	*ppBackend = pBackend;
602	return rc;
603	}
604
605
606	/**
607	* Worker for VDPluginLoadFromFilename() and vdPluginLoadFromPath().
608	*
609	* @returns VBox status code.
610	* @param pszFilename The plugin filename to load.
611	*/
612	DECLHIDDEN(int) vdPluginLoadFromFilename(const char *pszFilename)
613	{
614	#ifndef VBOX_HDD_NO_DYNAMIC_BACKENDS
615	/* Plugin loaded? Nothing to do. */
616	if (vdPluginFind(pszFilename))
617	return VINF_SUCCESS;
618
619	RTLDRMOD hPlugin = NIL_RTLDRMOD;
620	int rc = SUPR3HardenedLdrLoadPlugIn(pszFilename, &hPlugin, NULL);
621	if (RT_SUCCESS(rc))
622	{
623	VDBACKENDREGISTER BackendRegister;
624	PFNVDPLUGINLOAD pfnVDPluginLoad = NULL;
625
626	BackendRegister.u32Version = VD_BACKENDREG_CB_VERSION;
627	BackendRegister.pfnRegisterImage = vdPluginRegisterImage;
628	BackendRegister.pfnRegisterCache = vdPluginRegisterCache;
629	BackendRegister.pfnRegisterFilter = vdPluginRegisterFilter;
630
631	rc = RTLdrGetSymbol(hPlugin, VD_PLUGIN_LOAD_NAME, (void**)&pfnVDPluginLoad);
632	if (RT_FAILURE(rc) \|\| !pfnVDPluginLoad)
633	{
634	LogFunc(("error resolving the entry point %s in plugin %s, rc=%Rrc, pfnVDPluginLoad=%#p\n",
635	VD_PLUGIN_LOAD_NAME, pszFilename, rc, pfnVDPluginLoad));
636	if (RT_SUCCESS(rc))
637	rc = VERR_SYMBOL_NOT_FOUND;
638	}
639
640	if (RT_SUCCESS(rc))
641	{
642	/* Get the function table. */
643	rc = pfnVDPluginLoad(hPlugin, &BackendRegister);
644	}
645	else
646	LogFunc(("ignored plugin '%s': rc=%Rrc\n", pszFilename, rc));
647
648	/* Create a plugin entry on success. */
649	if (RT_SUCCESS(rc))
650	vdAddPlugin(hPlugin, pszFilename);
651	else
652	RTLdrClose(hPlugin);
653	}
654
655	return rc;
656	#else
657	RT_NOREF1(pszFilename);
658	return VERR_NOT_IMPLEMENTED;
659	#endif
660	}
661
662	/**
663	* Worker for VDPluginLoadFromPath() and vdLoadDynamicBackends().
664	*
665	* @returns VBox status code.
666	* @param pszPath The path to load plugins from.
667	*/
668	DECLHIDDEN(int) vdPluginLoadFromPath(const char *pszPath)
669	{
670	#ifndef VBOX_HDD_NO_DYNAMIC_BACKENDS
671	/* To get all entries with VBoxHDD as prefix. */
672	char pszPluginFilter = RTPathJoinA(pszPath, VD_PLUGIN_PREFIX "");
673	if (!pszPluginFilter)
674	return VERR_NO_STR_MEMORY;
675
676	PRTDIRENTRYEX pPluginDirEntry = NULL;
677	RTDIR hPluginDir;
678	size_t cbPluginDirEntry = sizeof(RTDIRENTRYEX);
679	int rc = RTDirOpenFiltered(&hPluginDir, pszPluginFilter, RTDIRFILTER_WINNT, 0 /fFlags/);
680	if (RT_SUCCESS(rc))
681	{
682	pPluginDirEntry = (PRTDIRENTRYEX)RTMemAllocZ(sizeof(RTDIRENTRYEX));
683	if (pPluginDirEntry)
684	{
685	while ( (rc = RTDirReadEx(hPluginDir, pPluginDirEntry, &cbPluginDirEntry, RTFSOBJATTRADD_NOTHING, RTPATH_F_ON_LINK))
686	!= VERR_NO_MORE_FILES)
687	{
688	char *pszPluginPath = NULL;
689
690	if (rc == VERR_BUFFER_OVERFLOW)
691	{
692	/* allocate new buffer. */
693	RTMemFree(pPluginDirEntry);
694	pPluginDirEntry = (PRTDIRENTRYEX)RTMemAllocZ(cbPluginDirEntry);
695	if (!pPluginDirEntry)
696	{
697	rc = VERR_NO_MEMORY;
698	break;
699	}
700	/* Retry. */
701	rc = RTDirReadEx(hPluginDir, pPluginDirEntry, &cbPluginDirEntry, RTFSOBJATTRADD_NOTHING, RTPATH_F_ON_LINK);
702	if (RT_FAILURE(rc))
703	break;
704	}
705	else if (RT_FAILURE(rc))
706	break;
707
708	/* We got the new entry. */
709	if (!RTFS_IS_FILE(pPluginDirEntry->Info.Attr.fMode))
710	continue;
711
712	/* Prepend the path to the libraries. */
713	pszPluginPath = RTPathJoinA(pszPath, pPluginDirEntry->szName);
714	if (!pszPluginPath)
715	{
716	rc = VERR_NO_STR_MEMORY;
717	break;
718	}
719
720	rc = vdPluginLoadFromFilename(pszPluginPath);
721	RTStrFree(pszPluginPath);
722	}
723
724	RTMemFree(pPluginDirEntry);
725	}
726	else
727	rc = VERR_NO_MEMORY;
728
729	RTDirClose(hPluginDir);
730	}
731	else
732	{
733	/* On Windows the above immediately signals that there are no
734	* files matching, while on other platforms enumerating the
735	* files below fails. Either way: no plugins. */
736	}
737
738	if (rc == VERR_NO_MORE_FILES)
739	rc = VINF_SUCCESS;
740	RTStrFree(pszPluginFilter);
741	return rc;
742	#else
743	RT_NOREF1(pszPath);
744	return VERR_NOT_IMPLEMENTED;
745	#endif
746	}
747
748	#ifndef VBOX_HDD_NO_DYNAMIC_BACKENDS
749	/**
750	* internal: scans plugin directory and loads found plugins.
751	*/
752	static int vdLoadDynamicBackends(void)
753	{
754	/*
755	* Enumerate plugin backends from the application directory where the other
756	* shared libraries are.
757	*/
758	char szPath[RTPATH_MAX];
759	int rc = RTPathAppPrivateArch(szPath, sizeof(szPath));
760	if (RT_FAILURE(rc))
761	return rc;
762
763	return vdPluginLoadFromPath(szPath);
764	}
765	#endif
766
767	/**
768	* Worker for VDPluginUnloadFromFilename() and vdPluginUnloadFromPath().
769	*
770	* @returns VBox status code.
771	* @param pszFilename The plugin filename to unload.
772	*/
773	DECLHIDDEN(int) vdPluginUnloadFromFilename(const char *pszFilename)
774	{
775	#ifndef VBOX_HDD_NO_DYNAMIC_BACKENDS
776	return vdRemovePlugin(pszFilename);
777	#else
778	RT_NOREF1(pszFilename);
779	return VERR_NOT_IMPLEMENTED;
780	#endif
781	}
782
783	/**
784	* Worker for VDPluginUnloadFromPath().
785	*
786	* @returns VBox status code.
787	* @param pszPath The path to unload plugins from.
788	*/
789	DECLHIDDEN(int) vdPluginUnloadFromPath(const char *pszPath)
790	{
791	#ifndef VBOX_HDD_NO_DYNAMIC_BACKENDS
792	/* To get all entries with VBoxHDD as prefix. */
793	char pszPluginFilter = RTPathJoinA(pszPath, VD_PLUGIN_PREFIX "");
794	if (!pszPluginFilter)
795	return VERR_NO_STR_MEMORY;
796
797	PRTDIRENTRYEX pPluginDirEntry = NULL;
798	RTDIR hPluginDir;
799	size_t cbPluginDirEntry = sizeof(RTDIRENTRYEX);
800	int rc = RTDirOpenFiltered(&hPluginDir, pszPluginFilter, RTDIRFILTER_WINNT, 0 /fFlags/);
801	if (RT_SUCCESS(rc))
802	{
803	pPluginDirEntry = (PRTDIRENTRYEX)RTMemAllocZ(sizeof(RTDIRENTRYEX));
804	if (pPluginDirEntry)
805	{
806	while ((rc = RTDirReadEx(hPluginDir, pPluginDirEntry, &cbPluginDirEntry, RTFSOBJATTRADD_NOTHING, RTPATH_F_ON_LINK)) != VERR_NO_MORE_FILES)
807	{
808	char *pszPluginPath = NULL;
809
810	if (rc == VERR_BUFFER_OVERFLOW)
811	{
812	/* allocate new buffer. */
813	RTMemFree(pPluginDirEntry);
814	pPluginDirEntry = (PRTDIRENTRYEX)RTMemAllocZ(cbPluginDirEntry);
815	if (!pPluginDirEntry)
816	{
817	rc = VERR_NO_MEMORY;
818	break;
819	}
820	/* Retry. */
821	rc = RTDirReadEx(hPluginDir, pPluginDirEntry, &cbPluginDirEntry, RTFSOBJATTRADD_NOTHING, RTPATH_F_ON_LINK);
822	if (RT_FAILURE(rc))
823	break;
824	}
825	else if (RT_FAILURE(rc))
826	break;
827
828	/* We got the new entry. */
829	if (!RTFS_IS_FILE(pPluginDirEntry->Info.Attr.fMode))
830	continue;
831
832	/* Prepend the path to the libraries. */
833	pszPluginPath = RTPathJoinA(pszPath, pPluginDirEntry->szName);
834	if (!pszPluginPath)
835	{
836	rc = VERR_NO_STR_MEMORY;
837	break;
838	}
839
840	rc = vdPluginUnloadFromFilename(pszPluginPath);
841	RTStrFree(pszPluginPath);
842	}
843
844	RTMemFree(pPluginDirEntry);
845	}
846	else
847	rc = VERR_NO_MEMORY;
848
849	RTDirClose(hPluginDir);
850	}
851	else
852	{
853	/* On Windows the above immediately signals that there are no
854	* files matching, while on other platforms enumerating the
855	* files below fails. Either way: no plugins. */
856	}
857
858	if (rc == VERR_NO_MORE_FILES)
859	rc = VINF_SUCCESS;
860	RTStrFree(pszPluginFilter);
861	return rc;
862	#else
863	RT_NOREF1(pszPath);
864	return VERR_NOT_IMPLEMENTED;
865	#endif
866	}
867
868
869	/**
870	* Initializes the plugin state to be able to load further plugins and populates
871	* the backend lists with the compiled in backends.
872	*
873	* @returns VBox status code.
874	*/
875	DECLHIDDEN(int) vdPluginInit(void)
876	{
877	int rc = vdAddBackends(NIL_RTLDRMOD, aStaticBackends, RT_ELEMENTS(aStaticBackends));
878	if (RT_SUCCESS(rc))
879	{
880	rc = vdAddCacheBackends(NIL_RTLDRMOD, aStaticCacheBackends, RT_ELEMENTS(aStaticCacheBackends));
881	#ifndef VBOX_HDD_NO_DYNAMIC_BACKENDS
882	if (RT_SUCCESS(rc))
883	{
884	RTListInit(&g_ListPluginsLoaded);
885	rc = vdLoadDynamicBackends();
886	}
887	#endif
888	}
889
890	return rc;
891	}
892
893
894	/**
895	* Tears down the plugin related state.
896	*
897	* @returns VBox status code.
898	*/
899	DECLHIDDEN(int) vdPluginTerm(void)
900	{
901	if (!g_apBackends)
902	return VERR_INTERNAL_ERROR;
903
904	#ifndef VBOX_HDD_NO_DYNAMIC_BACKENDS
905	if (g_pahFilterBackendPlugins)
906	RTMemFree(g_pahFilterBackendPlugins);
907	#endif
908	if (g_apFilterBackends)
909	RTMemFree(g_apFilterBackends);
910	#ifndef VBOX_HDD_NO_DYNAMIC_BACKENDS
911	if (g_ahCacheBackendPlugins)
912	RTMemFree(g_ahCacheBackendPlugins);
913	#endif
914	if (g_apCacheBackends)
915	RTMemFree(g_apCacheBackends);
916	RTMemFree(g_apBackends);
917
918	g_cBackends = 0;
919	g_apBackends = NULL;
920
921	/* Clear the supported cache backends. */
922	g_cCacheBackends = 0;
923	g_apCacheBackends = NULL;
924	#ifndef VBOX_HDD_NO_DYNAMIC_BACKENDS
925	g_ahCacheBackendPlugins = NULL;
926	#endif
927
928	/* Clear the supported filter backends. */
929	g_cFilterBackends = 0;
930	g_apFilterBackends = NULL;
931	#ifndef VBOX_HDD_NO_DYNAMIC_BACKENDS
932	g_pahFilterBackendPlugins = NULL;
933	#endif
934
935	#ifndef VBOX_HDD_NO_DYNAMIC_BACKENDS
936	PVDPLUGIN pPlugin, pPluginNext;
937	RTListForEachSafe(&g_ListPluginsLoaded, pPlugin, pPluginNext, VDPLUGIN, NodePlugin)
938	{
939	RTLdrClose(pPlugin->hPlugin);
940	RTStrFree(pPlugin->pszFilename);
941	RTListNodeRemove(&pPlugin->NodePlugin);
942	RTMemFree(pPlugin);
943	}
944	#endif
945
946	return VINF_SUCCESS;
947	}
948
949
950	/**
951	* Returns whether the plugin related state is initialized.
952	*
953	* @returns true if the plugin state is initialized and plugins can be loaded,
954	* false otherwise.
955	*/
956	DECLHIDDEN(bool) vdPluginIsInitialized(void)
957	{
958	return g_apBackends != NULL;
959	}
960

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source: vbox/trunk/src/VBox/Storage/VDPlugin.cpp@ 83043

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