VBoxGuestR3LibSharedFolders.cpp@ 43898

Last change on this file since 43898 was 41443, checked in by vboxsync, 13 years ago
Additions/SharedFolders: better error handling of VbglR3SharedFolderGetMappings()
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1	/* $Id: VBoxGuestR3LibSharedFolders.cpp 41443 2012-05-25 07:52:59Z vboxsync $ */
2	/** @file
3	* VBoxGuestR3Lib - Ring-3 Support Library for VirtualBox guest additions, shared folders.
4	*/
5
6	/*
7	* Copyright (C) 2010 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	* The contents of this file may alternatively be used under the terms
18	* of the Common Development and Distribution License Version 1.0
19	* (CDDL) only, as it comes in the "COPYING.CDDL" file of the
20	* VirtualBox OSE distribution, in which case the provisions of the
21	* CDDL are applicable instead of those of the GPL.
22	*
23	* You may elect to license modified versions of this file under the
24	* terms and conditions of either the GPL or the CDDL or both.
25	*/
26
27
28	/*******************************************************************************
29	* Header Files *
30	*******************************************************************************/
31	#include <iprt/string.h>
32	#include <iprt/mem.h>
33	#include <iprt/assert.h>
34	#include <iprt/cpp/autores.h>
35	#include <iprt/stdarg.h>
36	#include <VBox/log.h>
37	#include <VBox/shflsvc.h> /** @todo File should be moved to VBox/HostServices/SharedFolderSvc.h */
38
39	#include "VBGLR3Internal.h"
40
41
42	/**
43	* Connects to the shared folder service.
44	*
45	* @returns VBox status code
46	* @param pu32ClientId Where to put the client id on success. The client id
47	* must be passed to all the other calls to the service.
48	*/
49	VBGLR3DECL(int) VbglR3SharedFolderConnect(uint32_t *pu32ClientId)
50	{
51	VBoxGuestHGCMConnectInfo Info;
52	Info.result = VERR_WRONG_ORDER;
53	Info.Loc.type = VMMDevHGCMLoc_LocalHost_Existing;
54	RT_ZERO(Info.Loc.u);
55	strcpy(Info.Loc.u.host.achName, "VBoxSharedFolders");
56	Info.u32ClientID = UINT32_MAX; /* try make valgrind shut up. */
57
58	int rc = vbglR3DoIOCtl(VBOXGUEST_IOCTL_HGCM_CONNECT, &Info, sizeof(Info));
59	if (RT_SUCCESS(rc))
60	{
61	rc = Info.result;
62	if (RT_SUCCESS(rc))
63	*pu32ClientId = Info.u32ClientID;
64	}
65	return rc;
66	}
67
68
69	/**
70	* Disconnect from the shared folder service.
71	*
72	* @returns VBox status code.
73	* @param u32ClientId The client id returned by VbglR3InfoSvcConnect().
74	*/
75	VBGLR3DECL(int) VbglR3SharedFolderDisconnect(uint32_t u32ClientId)
76	{
77	VBoxGuestHGCMDisconnectInfo Info;
78	Info.result = VERR_WRONG_ORDER;
79	Info.u32ClientID = u32ClientId;
80
81	int rc = vbglR3DoIOCtl(VBOXGUEST_IOCTL_HGCM_DISCONNECT, &Info, sizeof(Info));
82	if (RT_SUCCESS(rc))
83	rc = Info.result;
84	return rc;
85	}
86
87
88	/**
89	* Checks whether a shared folder share exists or not.
90	*
91	* @returns True if shared folder exists, false if not.
92	* @param u32ClientId The client id returned by VbglR3InfoSvcConnect().
93	* @param pszShareName Shared folder name to check.
94	*/
95	VBGLR3DECL(bool) VbglR3SharedFolderExists(uint32_t u32ClientId, const char *pszShareName)
96	{
97	AssertPtr(pszShareName);
98
99	uint32_t cMappings;
100	VBGLR3SHAREDFOLDERMAPPING *paMappings;
101
102	/** @todo Use some caching here? */
103	bool fFound = false;
104	int rc = VbglR3SharedFolderGetMappings(u32ClientId, true /* Only process auto-mounted folders */,
105	&paMappings, &cMappings);
106	if (RT_SUCCESS(rc))
107	{
108	for (uint32_t i = 0; i < cMappings && !fFound; i++)
109	{
110	char *pszName = NULL;
111	rc = VbglR3SharedFolderGetName(u32ClientId, paMappings[i].u32Root, &pszName);
112	if ( RT_SUCCESS(rc)
113	&& *pszName)
114	{
115	if (RTStrICmp(pszName, pszShareName) == 0)
116	fFound = true;
117	RTStrFree(pszName);
118	}
119	}
120	VbglR3SharedFolderFreeMappings(paMappings);
121	}
122	return fFound;
123	}
124
125
126	/**
127	* Get the list of available shared folders.
128	*
129	* @returns VBox status code.
130	* @param u32ClientId The client id returned by VbglR3SharedFolderConnect().
131	* @param fAutoMountOnly Flag whether only auto-mounted shared folders
132	* should be reported.
133	* @param ppaMappings Allocated array which will retrieve the mapping info. Needs
134	* to be freed with VbglR3SharedFolderFreeMappings() later.
135	* @param pcMappings The number of mappings returned in @a ppaMappings.
136	*/
137	VBGLR3DECL(int) VbglR3SharedFolderGetMappings(uint32_t u32ClientId, bool fAutoMountOnly,
138	PVBGLR3SHAREDFOLDERMAPPING ppaMappings, uint32_t pcMappings)
139	{
140	AssertPtrReturn(pcMappings, VERR_INVALID_PARAMETER);
141	AssertPtrReturn(ppaMappings, VERR_INVALID_PARAMETER);
142
143	*pcMappings = 0;
144	*ppaMappings = NULL;
145
146	VBoxSFQueryMappings Msg;
147
148	Msg.callInfo.result = VERR_WRONG_ORDER;
149	Msg.callInfo.u32ClientID = u32ClientId;
150	Msg.callInfo.u32Function = SHFL_FN_QUERY_MAPPINGS;
151	Msg.callInfo.cParms = 3;
152
153	/* Set the mapping flags. */
154	uint32_t u32Flags = 0; /** @todo SHFL_MF_UTF8 is not implemented yet. */
155	if (fAutoMountOnly) /* We only want the mappings which get auto-mounted. */
156	u32Flags \|= SHFL_MF_AUTOMOUNT;
157	VbglHGCMParmUInt32Set(&Msg.flags, u32Flags);
158
159	/*
160	* Prepare and get the actual mappings from the host service.
161	*/
162	int rc = VINF_SUCCESS;
163	uint32_t cMappings = 8; /* Should be a good default value. */
164	uint32_t cbSize = cMappings * sizeof(VBGLR3SHAREDFOLDERMAPPING);
165	VBGLR3SHAREDFOLDERMAPPING *ppaMappingsTemp = (PVBGLR3SHAREDFOLDERMAPPING)RTMemAllocZ(cbSize);
166	if (!ppaMappingsTemp)
167	return VERR_NO_MEMORY;
168
169	do
170	{
171	VbglHGCMParmUInt32Set(&Msg.numberOfMappings, cMappings);
172	VbglHGCMParmPtrSet(&Msg.mappings, ppaMappingsTemp, cbSize);
173
174	rc = vbglR3DoIOCtl(VBOXGUEST_IOCTL_HGCM_CALL(sizeof(Msg)), &Msg, sizeof(Msg));
175	if (RT_SUCCESS(rc))
176	{
177	rc = Msg.callInfo.result;
178	if (RT_SUCCESS(rc))
179	{
180	VbglHGCMParmUInt32Get(&Msg.numberOfMappings, pcMappings);
181
182	/* Do we have more mappings than we have allocated space for? */
183	if (rc == VINF_BUFFER_OVERFLOW)
184	{
185	cMappings = *pcMappings;
186	cbSize = cMappings * sizeof(VBGLR3SHAREDFOLDERMAPPING);
187	void *pvNew = RTMemRealloc(ppaMappingsTemp, cbSize);
188	AssertPtrBreakStmt(pvNew, rc = VERR_NO_MEMORY);
189	ppaMappingsTemp = (PVBGLR3SHAREDFOLDERMAPPING)pvNew;
190	}
191	}
192	}
193	} while (rc == VINF_BUFFER_OVERFLOW);
194
195	if ( RT_FAILURE(rc)
196	\|\| !*pcMappings)
197	{
198	RTMemFree(ppaMappingsTemp);
199	ppaMappingsTemp = NULL;
200	}
201
202	*ppaMappings = ppaMappingsTemp;
203
204	return rc;
205	}
206
207
208	/**
209	* Frees the shared folder mappings allocated by
210	* VbglR3SharedFolderGetMappings() before.
211	*
212	* @param paMappings What
213	*/
214	VBGLR3DECL(void) VbglR3SharedFolderFreeMappings(PVBGLR3SHAREDFOLDERMAPPING paMappings)
215	{
216	if (paMappings)
217	RTMemFree(paMappings);
218	}
219
220
221	/**
222	* Get the real name of a shared folder.
223	*
224	* @returns VBox status code.
225	* @param u32ClientId The client id returned by VbglR3InvsSvcConnect().
226	* @param u32Root Root ID of shared folder to get the name for.
227	* @param ppszName Where to return the name string. This shall be
228	* freed by calling RTStrFree.
229	*/
230	VBGLR3DECL(int) VbglR3SharedFolderGetName(uint32_t u32ClientId, uint32_t u32Root, char **ppszName)
231	{
232	AssertPtr(ppszName);
233
234	VBoxSFQueryMapName Msg;
235
236	Msg.callInfo.result = VERR_WRONG_ORDER;
237	Msg.callInfo.u32ClientID = u32ClientId;
238	Msg.callInfo.u32Function = SHFL_FN_QUERY_MAP_NAME;
239	Msg.callInfo.cParms = 2;
240
241	int rc;
242	uint32_t cbString = sizeof(SHFLSTRING) + SHFL_MAX_LEN;
243	PSHFLSTRING pString = (PSHFLSTRING)RTMemAlloc(cbString);
244	if (pString)
245	{
246	RT_ZERO(*pString);
247	ShflStringInitBuffer(pString, SHFL_MAX_LEN);
248
249	VbglHGCMParmUInt32Set(&Msg.root, u32Root);
250	VbglHGCMParmPtrSet(&Msg.name, pString, cbString);
251
252	rc = vbglR3DoIOCtl(VBOXGUEST_IOCTL_HGCM_CALL(sizeof(Msg)), &Msg, sizeof(Msg));
253	if (RT_SUCCESS(rc))
254	{
255	rc = Msg.callInfo.result;
256	if (RT_SUCCESS(rc))
257	{
258	*ppszName = NULL;
259	rc = RTUtf16ToUtf8(&pString->String.ucs2[0], ppszName);
260	}
261	}
262	RTMemFree(pString);
263	}
264	else
265	rc = VERR_INVALID_PARAMETER;
266	return rc;
267	}
268
269	/**
270	* Retrieves the prefix for a shared folder mount point. If no prefix
271	* is set in the guest properties "sf_" is returned.
272	*
273	* @returns VBox status code.
274	* @param ppszPrefix Where to return the prefix string. This shall be
275	* freed by calling RTStrFree.
276	*/
277	VBGLR3DECL(int) VbglR3SharedFolderGetMountPrefix(char **ppszPrefix)
278	{
279	AssertPtrReturn(ppszPrefix, VERR_INVALID_POINTER);
280	int rc;
281	#ifdef VBOX_WITH_GUEST_PROPS
282	uint32_t u32ClientIdGuestProp;
283	rc = VbglR3GuestPropConnect(&u32ClientIdGuestProp);
284	if (RT_SUCCESS(rc))
285	{
286	rc = VbglR3GuestPropReadValueAlloc(u32ClientIdGuestProp, "/VirtualBox/GuestAdd/SharedFolders/MountPrefix", ppszPrefix);
287	if (rc == VERR_NOT_FOUND) /* No prefix set? Then set the default. */
288	{
289	#endif
290	rc = RTStrDupEx(ppszPrefix, "sf_");
291	#ifdef VBOX_WITH_GUEST_PROPS
292	}
293	VbglR3GuestPropDisconnect(u32ClientIdGuestProp);
294	}
295	#endif
296	return rc;
297	}
298
299	/**
300	* Retrieves the mount root directory for auto-mounted shared
301	* folders. mount point. If no string is set (VERR_NOT_FOUND)
302	* it's up on the caller (guest) to decide where to mount.
303	*
304	* @returns VBox status code.
305	* @param ppszDir Where to return the directory
306	* string. This shall be freed by
307	* calling RTStrFree.
308	*/
309	VBGLR3DECL(int) VbglR3SharedFolderGetMountDir(char **ppszDir)
310	{
311	AssertPtrReturn(ppszDir, VERR_INVALID_POINTER);
312	int rc;
313	#ifdef VBOX_WITH_GUEST_PROPS
314	uint32_t u32ClientIdGuestProp;
315	rc = VbglR3GuestPropConnect(&u32ClientIdGuestProp);
316	if (RT_SUCCESS(rc))
317	{
318	rc = VbglR3GuestPropReadValueAlloc(u32ClientIdGuestProp, "/VirtualBox/GuestAdd/SharedFolders/MountDir", ppszDir);
319	VbglR3GuestPropDisconnect(u32ClientIdGuestProp);
320	}
321	#endif
322	return rc;
323	}
324

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source: vbox/trunk/src/VBox/Additions/common/VBoxGuestLib/VBoxGuestR3LibSharedFolders.cpp@ 43898

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