USBGetDevices.cpp@ 69731

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1	/* $Id: USBGetDevices.cpp 69500 2017-10-28 15:14:05Z vboxsync $ */
2	/** @file
3	* VirtualBox Linux host USB device enumeration.
4	*/
5
6	/*
7	* Copyright (C) 2006-2017 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 VBOX_USB_WITH_USBFS
23	#include "USBGetDevices.h"
24
25	#include <VBox/err.h>
26	#include <VBox/usb.h>
27	#include <VBox/usblib.h>
28
29	#include <iprt/linux/sysfs.h>
30	#include <iprt/cdefs.h>
31	#include <iprt/ctype.h>
32	#include <iprt/dir.h>
33	#include <iprt/env.h>
34	#include <iprt/file.h>
35	#include <iprt/fs.h>
36	#include <iprt/log.h>
37	#include <iprt/mem.h>
38	#include <iprt/param.h>
39	#include <iprt/path.h>
40	#include <iprt/string.h>
41	#include "vector.h"
42
43	#ifdef VBOX_WITH_LINUX_COMPILER_H
44	# include <linux/compiler.h>
45	#endif
46	#include <linux/usbdevice_fs.h>
47
48	#include <sys/sysmacros.h>
49	#include <sys/types.h>
50	#include <sys/stat.h>
51	#include <sys/vfs.h>
52
53	#include <dirent.h>
54	#include <dlfcn.h>
55	#include <errno.h>
56	#include <fcntl.h>
57	#include <stdio.h>
58	#include <string.h>
59	#include <unistd.h>
60
61
62	/*********************************************************************************************************************************
63	* Structures and Typedefs *
64	*********************************************************************************************************************************/
65	/** Structure describing a host USB device */
66	typedef struct USBDeviceInfo
67	{
68	/** The device node of the device. */
69	char *mDevice;
70	/** The system identifier of the device. Specific to the probing
71	* method. */
72	char *mSysfsPath;
73	/** List of interfaces as sysfs paths */
74	VECTOR_PTR(char *) mvecpszInterfaces;
75	} USBDeviceInfo;
76
77
78	/**
79	* Does some extra checks to improve the detected device state.
80	*
81	* We cannot distinguish between USED_BY_HOST_CAPTURABLE and
82	* USED_BY_GUEST, HELD_BY_PROXY all that well and it shouldn't be
83	* necessary either.
84	*
85	* We will however, distinguish between the device we have permissions
86	* to open and those we don't. This is necessary for two reasons.
87	*
88	* Firstly, because it's futile to even attempt opening a device which we
89	* don't have access to, it only serves to confuse the user. (That said,
90	* it might also be a bit confusing for the user to see that a USB device
91	* is grayed out with no further explanation, and no way of generating an
92	* error hinting at why this is the case.)
93	*
94	* Secondly and more importantly, we're racing against udevd with respect
95	* to permissions and group settings on newly plugged devices. When we
96	* detect a new device that we cannot access we will poll on it for a few
97	* seconds to give udevd time to fix it. The polling is actually triggered
98	* in the 'new device' case in the compare loop.
99	*
100	* The USBDEVICESTATE_USED_BY_HOST state is only used for this no-access
101	* case, while USBDEVICESTATE_UNSUPPORTED is only used in the 'hub' case.
102	* When it's neither of these, we set USBDEVICESTATE_UNUSED or
103	* USBDEVICESTATE_USED_BY_HOST_CAPTURABLE depending on whether there is
104	* a driver associated with any of the interfaces.
105	*
106	* All except the access check and a special idVendor == 0 precaution
107	* is handled at parse time.
108	*
109	* @returns The adjusted state.
110	* @param pDevice The device.
111	*/
112	static USBDEVICESTATE usbDeterminState(PCUSBDEVICE pDevice)
113	{
114	/*
115	* If it's already flagged as unsupported, there is nothing to do.
116	*/
117	USBDEVICESTATE enmState = pDevice->enmState;
118	if (enmState == USBDEVICESTATE_UNSUPPORTED)
119	return USBDEVICESTATE_UNSUPPORTED;
120
121	/*
122	* Root hubs and similar doesn't have any vendor id, just
123	* refuse these device.
124	*/
125	if (!pDevice->idVendor)
126	return USBDEVICESTATE_UNSUPPORTED;
127
128	/*
129	* Check if we've got access to the device, if we haven't flag
130	* it as used-by-host.
131	*/
132	#ifndef VBOX_USB_WITH_SYSFS
133	const char *pszAddress = pDevice->pszAddress;
134	#else
135	if (pDevice->pszAddress == NULL)
136	/* We can't do much with the device without an address. */
137	return USBDEVICESTATE_UNSUPPORTED;
138	const char *pszAddress = strstr(pDevice->pszAddress, "//device:");
139	pszAddress = pszAddress != NULL
140	? pszAddress + sizeof("//device:") - 1
141	: pDevice->pszAddress;
142	#endif
143	if ( access(pszAddress, R_OK \| W_OK) != 0
144	&& errno == EACCES)
145	return USBDEVICESTATE_USED_BY_HOST;
146
147	#ifdef VBOX_USB_WITH_SYSFS
148	/**
149	* @todo Check that any other essential fields are present and mark as
150	* invalid if not. Particularly to catch the case where the device was
151	* unplugged while we were reading in its properties.
152	*/
153	#endif
154
155	return enmState;
156	}
157
158
159	/**
160	* Dumps a USBDEVICE structure to the log using LogLevel 3.
161	* @param pDev The structure to log.
162	* @todo This is really common code.
163	*/
164	static void usbLogDevice(PUSBDEVICE pDev)
165	{
166	NOREF(pDev);
167	if (LogIs3Enabled())
168	{
169	Log3(("USB device:\n"));
170	Log3(("Product: %s (%x)\n", pDev->pszProduct, pDev->idProduct));
171	Log3(("Manufacturer: %s (Vendor ID %x)\n", pDev->pszManufacturer, pDev->idVendor));
172	Log3(("Serial number: %s (%llx)\n", pDev->pszSerialNumber, pDev->u64SerialHash));
173	Log3(("Device revision: %d\n", pDev->bcdDevice));
174	Log3(("Device class: %x\n", pDev->bDeviceClass));
175	Log3(("Device subclass: %x\n", pDev->bDeviceSubClass));
176	Log3(("Device protocol: %x\n", pDev->bDeviceProtocol));
177	Log3(("USB version number: %d\n", pDev->bcdUSB));
178	Log3(("Device speed: %s\n",
179	pDev->enmSpeed == USBDEVICESPEED_UNKNOWN ? "unknown"
180	: pDev->enmSpeed == USBDEVICESPEED_LOW ? "1.5 MBit/s"
181	: pDev->enmSpeed == USBDEVICESPEED_FULL ? "12 MBit/s"
182	: pDev->enmSpeed == USBDEVICESPEED_HIGH ? "480 MBit/s"
183	: pDev->enmSpeed == USBDEVICESPEED_SUPER ? "5.0 GBit/s"
184	: pDev->enmSpeed == USBDEVICESPEED_VARIABLE ? "variable"
185	: "invalid"));
186	Log3(("Number of configurations: %d\n", pDev->bNumConfigurations));
187	Log3(("Bus number: %d\n", pDev->bBus));
188	Log3(("Port number: %d\n", pDev->bPort));
189	Log3(("Device number: %d\n", pDev->bDevNum));
190	Log3(("Device state: %s\n",
191	pDev->enmState == USBDEVICESTATE_UNSUPPORTED ? "unsupported"
192	: pDev->enmState == USBDEVICESTATE_USED_BY_HOST ? "in use by host"
193	: pDev->enmState == USBDEVICESTATE_USED_BY_HOST_CAPTURABLE ? "in use by host, possibly capturable"
194	: pDev->enmState == USBDEVICESTATE_UNUSED ? "not in use"
195	: pDev->enmState == USBDEVICESTATE_HELD_BY_PROXY ? "held by proxy"
196	: pDev->enmState == USBDEVICESTATE_USED_BY_GUEST ? "used by guest"
197	: "invalid"));
198	Log3(("OS device address: %s\n", pDev->pszAddress));
199	}
200	}
201
202
203	#ifdef VBOX_USB_WITH_USBFS
204
205	/**
206	* "reads" the number suffix.
207	*
208	* It's more like validating it and skipping the necessary number of chars.
209	*/
210	static int usbfsReadSkipSuffix(char **ppszNext)
211	{
212	char pszNext = ppszNext;
213	if (!RT_C_IS_SPACE(pszNext) && pszNext)
214	{
215	/* skip unit */
216	if (pszNext[0] == 'm' && pszNext[1] == 's')
217	pszNext += 2;
218	else if (pszNext[0] == 'm' && pszNext[1] == 'A')
219	pszNext += 2;
220
221	/* skip parenthesis */
222	if (*pszNext == '(')
223	{
224	pszNext = strchr(pszNext, ')');
225	if (!pszNext++)
226	{
227	AssertMsgFailed(("ppszNext=%s\n", ppszNext));
228	return VERR_PARSE_ERROR;
229	}
230	}
231
232	/* blank or end of the line. */
233	if (!RT_C_IS_SPACE(pszNext) && pszNext)
234	{
235	AssertMsgFailed(("pszNext=%s\n", pszNext));
236	return VERR_PARSE_ERROR;
237	}
238
239	/* it's ok. */
240	*ppszNext = pszNext;
241	}
242
243	return VINF_SUCCESS;
244	}
245
246
247	/**
248	* Reads a USB number returning the number and the position of the next character to parse.
249	*/
250	static int usbfsReadNum(const char pszValue, unsigned uBase, uint32_t u32Mask, void pvNum, char **ppszNext)
251	{
252	/*
253	* Initialize return value to zero and strip leading spaces.
254	*/
255	switch (u32Mask)
256	{
257	case 0xff: (uint8_t )pvNum = 0; break;
258	case 0xffff: (uint16_t )pvNum = 0; break;
259	case 0xffffffff: (uint32_t )pvNum = 0; break;
260	}
261	pszValue = RTStrStripL(pszValue);
262	if (*pszValue)
263	{
264	/*
265	* Try convert the number.
266	*/
267	char *pszNext;
268	uint32_t u32 = 0;
269	RTStrToUInt32Ex(pszValue, &pszNext, uBase, &u32);
270	if (pszNext == pszValue)
271	{
272	AssertMsgFailed(("pszValue=%d\n", pszValue));
273	return VERR_NO_DATA;
274	}
275
276	/*
277	* Check the range.
278	*/
279	if (u32 & ~u32Mask)
280	{
281	AssertMsgFailed(("pszValue=%d u32=%#x lMask=%#x\n", pszValue, u32, u32Mask));
282	return VERR_OUT_OF_RANGE;
283	}
284
285	int rc = usbfsReadSkipSuffix(&pszNext);
286	if (RT_FAILURE(rc))
287	return rc;
288
289	*ppszNext = pszNext;
290
291	/*
292	* Set the value.
293	*/
294	switch (u32Mask)
295	{
296	case 0xff: (uint8_t )pvNum = (uint8_t)u32; break;
297	case 0xffff: (uint16_t )pvNum = (uint16_t)u32; break;
298	case 0xffffffff: (uint32_t )pvNum = (uint32_t)u32; break;
299	}
300	}
301	return VINF_SUCCESS;
302	}
303
304
305	static int usbfsRead8(const char pszValue, unsigned uBase, uint8_t pu8, char **ppszNext)
306	{
307	return usbfsReadNum(pszValue, uBase, 0xff, pu8, ppszNext);
308	}
309
310
311	static int usbfsRead16(const char pszValue, unsigned uBase, uint16_t pu16, char **ppszNext)
312	{
313	return usbfsReadNum(pszValue, uBase, 0xffff, pu16, ppszNext);
314	}
315
316
317	/**
318	* Reads a USB BCD number returning the number and the position of the next character to parse.
319	* The returned number contains the integer part in the high byte and the decimal part in the low byte.
320	*/
321	static int usbfsReadBCD(const char pszValue, unsigned uBase, uint16_t pu16, char **ppszNext)
322	{
323	/*
324	* Initialize return value to zero and strip leading spaces.
325	*/
326	*pu16 = 0;
327	pszValue = RTStrStripL(pszValue);
328	if (*pszValue)
329	{
330	/*
331	* Try convert the number.
332	*/
333	/* integer part */
334	char *pszNext;
335	uint32_t u32Int = 0;
336	RTStrToUInt32Ex(pszValue, &pszNext, uBase, &u32Int);
337	if (pszNext == pszValue)
338	{
339	AssertMsgFailed(("pszValue=%s\n", pszValue));
340	return VERR_NO_DATA;
341	}
342	if (u32Int & ~0xff)
343	{
344	AssertMsgFailed(("pszValue=%s u32Int=%#x (int)\n", pszValue, u32Int));
345	return VERR_OUT_OF_RANGE;
346	}
347
348	/* skip dot and read decimal part */
349	if (*pszNext != '.')
350	{
351	AssertMsgFailed(("pszValue=%s pszNext=%s (int)\n", pszValue, pszNext));
352	return VERR_PARSE_ERROR;
353	}
354	char *pszValue2 = RTStrStripL(pszNext + 1);
355	uint32_t u32Dec = 0;
356	RTStrToUInt32Ex(pszValue2, &pszNext, uBase, &u32Dec);
357	if (pszNext == pszValue)
358	{
359	AssertMsgFailed(("pszValue=%s\n", pszValue));
360	return VERR_NO_DATA;
361	}
362	if (u32Dec & ~0xff)
363	{
364	AssertMsgFailed(("pszValue=%s u32Dec=%#x\n", pszValue, u32Dec));
365	return VERR_OUT_OF_RANGE;
366	}
367
368	/*
369	* Validate and skip stuff following the number.
370	*/
371	int rc = usbfsReadSkipSuffix(&pszNext);
372	if (RT_FAILURE(rc))
373	return rc;
374	*ppszNext = pszNext;
375
376	/*
377	* Set the value.
378	*/
379	*pu16 = (uint16_t)((u32Int << 8) \| (uint16_t)u32Dec);
380	}
381	return VINF_SUCCESS;
382	}
383
384
385	/**
386	* Reads a string, i.e. allocates memory and copies it.
387	*
388	* We assume that a string is Utf8 and if that's not the case
389	* (pre-2.6.32-kernels used Latin-1, but so few devices return non-ASCII that
390	* this usually goes unnoticed) then we mercilessly force it to be so.
391	*/
392	static int usbfsReadStr(const char pszValue, const char *ppsz)
393	{
394	char *psz;
395
396	if (*ppsz)
397	RTStrFree((char )ppsz);
398	psz = RTStrDup(pszValue);
399	if (psz)
400	{
401	USBLibPurgeEncoding(psz);
402	*ppsz = psz;
403	return VINF_SUCCESS;
404	}
405	return VERR_NO_MEMORY;
406	}
407
408
409	/**
410	* Skips the current property.
411	*/
412	static char usbfsReadSkip(char pszValue)
413	{
414	char *psz = strchr(pszValue, '=');
415	if (psz)
416	psz = strchr(psz + 1, '=');
417	if (!psz)
418	return strchr(pszValue, '\0');
419	while (psz > pszValue && !RT_C_IS_SPACE(psz[-1]))
420	psz--;
421	Assert(psz > pszValue);
422	return psz;
423	}
424
425
426	/**
427	* Determine the USB speed.
428	*/
429	static int usbfsReadSpeed(const char pszValue, USBDEVICESPEED pSpd, char **ppszNext)
430	{
431	pszValue = RTStrStripL(pszValue);
432	/* verified with Linux 2.4.0 ... Linux 2.6.25 */
433	if (!strncmp(pszValue, RT_STR_TUPLE("1.5")))
434	*pSpd = USBDEVICESPEED_LOW;
435	else if (!strncmp(pszValue, RT_STR_TUPLE("12 ")))
436	*pSpd = USBDEVICESPEED_FULL;
437	else if (!strncmp(pszValue, RT_STR_TUPLE("480")))
438	*pSpd = USBDEVICESPEED_HIGH;
439	else if (!strncmp(pszValue, RT_STR_TUPLE("5000")))
440	*pSpd = USBDEVICESPEED_SUPER;
441	else
442	*pSpd = USBDEVICESPEED_UNKNOWN;
443	while (pszValue[0] != '\0' && !RT_C_IS_SPACE(pszValue[0]))
444	pszValue++;
445	ppszNext = (char )pszValue;
446	return VINF_SUCCESS;
447	}
448
449
450	/**
451	* Compare a prefix and returns pointer to the char following it if it matches.
452	*/
453	static char usbfsPrefix(char psz, const char *pszPref, size_t cchPref)
454	{
455	if (strncmp(psz, pszPref, cchPref))
456	return NULL;
457	return psz + cchPref;
458	}
459
460
461	/** Just a worker for USBProxyServiceLinux::getDevices that avoids some code duplication. */
462	static int usbfsAddDeviceToChain(PUSBDEVICE pDev, PUSBDEVICE ppFirst, PUSBDEVICE pppNext, const char pszUsbfsRoot,
463	bool fUnsupportedDevicesToo, int rc)
464	{
465	/* usbDeterminState requires the address. */
466	PUSBDEVICE pDevNew = (PUSBDEVICE)RTMemDup(pDev, sizeof(*pDev));
467	if (pDevNew)
468	{
469	RTStrAPrintf((char **)&pDevNew->pszAddress, "%s/%03d/%03d", pszUsbfsRoot, pDevNew->bBus, pDevNew->bDevNum);
470	if (pDevNew->pszAddress)
471	{
472	pDevNew->enmState = usbDeterminState(pDevNew);
473	if (pDevNew->enmState != USBDEVICESTATE_UNSUPPORTED \|\| fUnsupportedDevicesToo)
474	{
475	if (*pppNext)
476	**pppNext = pDevNew;
477	else
478	*ppFirst = pDevNew;
479	*pppNext = &pDevNew->pNext;
480	}
481	else
482	deviceFree(pDevNew);
483	}
484	else
485	{
486	deviceFree(pDevNew);
487	rc = VERR_NO_MEMORY;
488	}
489	}
490	else
491	{
492	rc = VERR_NO_MEMORY;
493	deviceFreeMembers(pDev);
494	}
495
496	return rc;
497	}
498
499
500	static int usbfsOpenDevicesFile(const char pszUsbfsRoot, FILE *ppFile)
501	{
502	char *pszPath;
503	FILE *pFile;
504	RTStrAPrintf(&pszPath, "%s/devices", pszUsbfsRoot);
505	if (!pszPath)
506	return VERR_NO_MEMORY;
507	pFile = fopen(pszPath, "r");
508	RTStrFree(pszPath);
509	if (!pFile)
510	return RTErrConvertFromErrno(errno);
511	*ppFile = pFile;
512	return VINF_SUCCESS;
513	}
514
515
516	/**
517	* USBProxyService::getDevices() implementation for usbfs.
518	*
519	* The @a fUnsupportedDevicesToo flag tells the function to return information
520	* about unsupported devices as well. This is used as a sanity test to check
521	* that a devices file is really what we expect.
522	*/
523	static PUSBDEVICE usbfsGetDevices(const char *pszUsbfsRoot, bool fUnsupportedDevicesToo)
524	{
525	PUSBDEVICE pFirst = NULL;
526	FILE *pFile = NULL;
527	int rc;
528	rc = usbfsOpenDevicesFile(pszUsbfsRoot, &pFile);
529	if (RT_SUCCESS(rc))
530	{
531	PUSBDEVICE *ppNext = NULL;
532	int cHits = 0;
533	char szLine[1024];
534	USBDEVICE Dev;
535	RT_ZERO(Dev);
536	Dev.enmState = USBDEVICESTATE_UNUSED;
537
538	/* Set close on exit and hope no one is racing us. */
539	rc = fcntl(fileno(pFile), F_SETFD, FD_CLOEXEC) >= 0
540	? VINF_SUCCESS
541	: RTErrConvertFromErrno(errno);
542	while ( RT_SUCCESS(rc)
543	&& fgets(szLine, sizeof(szLine), pFile))
544	{
545	char *psz;
546	char *pszValue;
547
548	/* validate and remove the trailing newline. */
549	psz = strchr(szLine, '\0');
550	if (psz[-1] != '\n' && !feof(pFile))
551	{
552	AssertMsgFailed(("Line too long. (cch=%d)\n", strlen(szLine)));
553	continue;
554	}
555
556	/* strip */
557	psz = RTStrStrip(szLine);
558	if (!*psz)
559	continue;
560
561	/*
562	* Interpret the line.
563	* (Ordered by normal occurrence.)
564	*/
565	char ch = psz[0];
566	if (psz[1] != ':')
567	continue;
568	psz = RTStrStripL(psz + 3);
569	#define PREFIX(str) ( (pszValue = usbfsPrefix(psz, str, sizeof(str) - 1)) != NULL )
570	switch (ch)
571	{
572	/*
573	* T: Bus=dd Lev=dd Prnt=dd Port=dd Cnt=dd Dev#=ddd Spd=ddd MxCh=dd
574	* \| \| \| \| \| \| \| \| \|__MaxChildren
575	* \| \| \| \| \| \| \| \|__Device Speed in Mbps
576	* \| \| \| \| \| \| \|__DeviceNumber
577	* \| \| \| \| \| \|__Count of devices at this level
578	* \| \| \| \| \|__Connector/Port on Parent for this device
579	* \| \| \| \|__Parent DeviceNumber
580	* \| \| \|__Level in topology for this bus
581	* \| \|__Bus number
582	* \|__Topology info tag
583	*/
584	case 'T':
585	/* add */
586	AssertMsg(cHits >= 3 \|\| cHits == 0, ("cHits=%d\n", cHits));
587	if (cHits >= 3)
588	rc = usbfsAddDeviceToChain(&Dev, &pFirst, &ppNext, pszUsbfsRoot, fUnsupportedDevicesToo, rc);
589	else
590	deviceFreeMembers(&Dev);
591
592	/* Reset device state */
593	RT_ZERO(Dev);
594	Dev.enmState = USBDEVICESTATE_UNUSED;
595	cHits = 1;
596
597	/* parse the line. */
598	while (*psz && RT_SUCCESS(rc))
599	{
600	if (PREFIX("Bus="))
601	rc = usbfsRead8(pszValue, 10, &Dev.bBus, &psz);
602	else if (PREFIX("Port="))
603	rc = usbfsRead8(pszValue, 10, &Dev.bPort, &psz);
604	else if (PREFIX("Spd="))
605	rc = usbfsReadSpeed(pszValue, &Dev.enmSpeed, &psz);
606	else if (PREFIX("Dev#="))
607	rc = usbfsRead8(pszValue, 10, &Dev.bDevNum, &psz);
608	else
609	psz = usbfsReadSkip(psz);
610	psz = RTStrStripL(psz);
611	}
612	break;
613
614	/*
615	* Bandwidth info:
616	* B: Alloc=ddd/ddd us (xx%), #Int=ddd, #Iso=ddd
617	* \| \| \| \|__Number of isochronous requests
618	* \| \| \|__Number of interrupt requests
619	* \| \|__Total Bandwidth allocated to this bus
620	* \|__Bandwidth info tag
621	*/
622	case 'B':
623	break;
624
625	/*
626	* D: Ver=x.xx Cls=xx(sssss) Sub=xx Prot=xx MxPS=dd #Cfgs=dd
627	* \| \| \| \| \| \| \|__NumberConfigurations
628	* \| \| \| \| \| \|__MaxPacketSize of Default Endpoint
629	* \| \| \| \| \|__DeviceProtocol
630	* \| \| \| \|__DeviceSubClass
631	* \| \| \|__DeviceClass
632	* \| \|__Device USB version
633	* \|__Device info tag #1
634	*/
635	case 'D':
636	while (*psz && RT_SUCCESS(rc))
637	{
638	if (PREFIX("Ver="))
639	rc = usbfsReadBCD(pszValue, 16, &Dev.bcdUSB, &psz);
640	else if (PREFIX("Cls="))
641	{
642	rc = usbfsRead8(pszValue, 16, &Dev.bDeviceClass, &psz);
643	if (RT_SUCCESS(rc) && Dev.bDeviceClass == 9 /* HUB */)
644	Dev.enmState = USBDEVICESTATE_UNSUPPORTED;
645	}
646	else if (PREFIX("Sub="))
647	rc = usbfsRead8(pszValue, 16, &Dev.bDeviceSubClass, &psz);
648	else if (PREFIX("Prot="))
649	rc = usbfsRead8(pszValue, 16, &Dev.bDeviceProtocol, &psz);
650	//else if (PREFIX("MxPS="))
651	// rc = usbRead16(pszValue, 10, &Dev.wMaxPacketSize, &psz);
652	else if (PREFIX("#Cfgs="))
653	rc = usbfsRead8(pszValue, 10, &Dev.bNumConfigurations, &psz);
654	else
655	psz = usbfsReadSkip(psz);
656	psz = RTStrStripL(psz);
657	}
658	cHits++;
659	break;
660
661	/*
662	* P: Vendor=xxxx ProdID=xxxx Rev=xx.xx
663	* \| \| \| \|__Product revision number
664	* \| \| \|__Product ID code
665	* \| \|__Vendor ID code
666	* \|__Device info tag #2
667	*/
668	case 'P':
669	while (*psz && RT_SUCCESS(rc))
670	{
671	if (PREFIX("Vendor="))
672	rc = usbfsRead16(pszValue, 16, &Dev.idVendor, &psz);
673	else if (PREFIX("ProdID="))
674	rc = usbfsRead16(pszValue, 16, &Dev.idProduct, &psz);
675	else if (PREFIX("Rev="))
676	rc = usbfsReadBCD(pszValue, 16, &Dev.bcdDevice, &psz);
677	else
678	psz = usbfsReadSkip(psz);
679	psz = RTStrStripL(psz);
680	}
681	cHits++;
682	break;
683
684	/*
685	* String.
686	*/
687	case 'S':
688	if (PREFIX("Manufacturer="))
689	rc = usbfsReadStr(pszValue, &Dev.pszManufacturer);
690	else if (PREFIX("Product="))
691	rc = usbfsReadStr(pszValue, &Dev.pszProduct);
692	else if (PREFIX("SerialNumber="))
693	{
694	rc = usbfsReadStr(pszValue, &Dev.pszSerialNumber);
695	if (RT_SUCCESS(rc))
696	Dev.u64SerialHash = USBLibHashSerial(pszValue);
697	}
698	break;
699
700	/*
701	* C:* #Ifs=dd Cfg#=dd Atr=xx MPwr=dddmA
702	* \| \| \| \| \| \|__MaxPower in mA
703	* \| \| \| \| \|__Attributes
704	* \| \| \| \|__ConfiguratioNumber
705	* \| \| \|__NumberOfInterfaces
706	* \| \|__ "*" indicates the active configuration (others are " ")
707	* \|__Config info tag
708	*/
709	case 'C':
710	break;
711
712	/*
713	* I: If#=dd Alt=dd #EPs=dd Cls=xx(sssss) Sub=xx Prot=xx Driver=ssss
714	* \| \| \| \| \| \| \| \|__Driver name
715	* \| \| \| \| \| \| \| or "(none)"
716	* \| \| \| \| \| \| \|__InterfaceProtocol
717	* \| \| \| \| \| \|__InterfaceSubClass
718	* \| \| \| \| \|__InterfaceClass
719	* \| \| \| \|__NumberOfEndpoints
720	* \| \| \|__AlternateSettingNumber
721	* \| \|__InterfaceNumber
722	* \|__Interface info tag
723	*/
724	case 'I':
725	{
726	/* Check for thing we don't support. */
727	while (*psz && RT_SUCCESS(rc))
728	{
729	if (PREFIX("Driver="))
730	{
731	const char *pszDriver = NULL;
732	rc = usbfsReadStr(pszValue, &pszDriver);
733	if ( !pszDriver
734	\|\| !*pszDriver
735	\|\| !strcmp(pszDriver, "(none)")
736	\|\| !strcmp(pszDriver, "(no driver)"))
737	/* no driver */;
738	else if (!strcmp(pszDriver, "hub"))
739	Dev.enmState = USBDEVICESTATE_UNSUPPORTED;
740	else if (Dev.enmState == USBDEVICESTATE_UNUSED)
741	Dev.enmState = USBDEVICESTATE_USED_BY_HOST_CAPTURABLE;
742	RTStrFree((char *)pszDriver);
743	break; /* last attrib */
744	}
745	else if (PREFIX("Cls="))
746	{
747	uint8_t bInterfaceClass;
748	rc = usbfsRead8(pszValue, 16, &bInterfaceClass, &psz);
749	if (RT_SUCCESS(rc) && bInterfaceClass == 9 /* HUB */)
750	Dev.enmState = USBDEVICESTATE_UNSUPPORTED;
751	}
752	else
753	psz = usbfsReadSkip(psz);
754	psz = RTStrStripL(psz);
755	}
756	break;
757	}
758
759
760	/*
761	* E: Ad=xx(s) Atr=xx(ssss) MxPS=dddd Ivl=dddms
762	* \| \| \| \| \|__Interval (max) between transfers
763	* \| \| \| \|__EndpointMaxPacketSize
764	* \| \| \|__Attributes(EndpointType)
765	* \| \|__EndpointAddress(I=In,O=Out)
766	* \|__Endpoint info tag
767	*/
768	case 'E':
769	break;
770
771	}
772	#undef PREFIX
773	} /* parse loop */
774	fclose(pFile);
775
776	/*
777	* Add the current entry.
778	*/
779	AssertMsg(cHits >= 3 \|\| cHits == 0, ("cHits=%d\n", cHits));
780	if (cHits >= 3)
781	rc = usbfsAddDeviceToChain(&Dev, &pFirst, &ppNext, pszUsbfsRoot, fUnsupportedDevicesToo, rc);
782
783	/*
784	* Success?
785	*/
786	if (RT_FAILURE(rc))
787	{
788	while (pFirst)
789	{
790	PUSBDEVICE pFree = pFirst;
791	pFirst = pFirst->pNext;
792	deviceFree(pFree);
793	}
794	}
795	}
796	if (RT_FAILURE(rc))
797	LogFlow(("USBProxyServiceLinux::getDevices: rc=%Rrc\n", rc));
798	return pFirst;
799	}
800
801	#endif /* VBOX_USB_WITH_USBFS */
802	#ifdef VBOX_USB_WITH_SYSFS
803
804	static void usbsysfsCleanupDevInfo(USBDeviceInfo *pSelf)
805	{
806	RTStrFree(pSelf->mDevice);
807	RTStrFree(pSelf->mSysfsPath);
808	pSelf->mDevice = pSelf->mSysfsPath = NULL;
809	VEC_CLEANUP_PTR(&pSelf->mvecpszInterfaces);
810	}
811
812
813	static int usbsysfsInitDevInfo(USBDeviceInfo pSelf, const char aDevice, const char *aSystemID)
814	{
815	pSelf->mDevice = aDevice ? RTStrDup(aDevice) : NULL;
816	pSelf->mSysfsPath = aSystemID ? RTStrDup(aSystemID) : NULL;
817	VEC_INIT_PTR(&pSelf->mvecpszInterfaces, char *, RTStrFree);
818	if ((aDevice && !pSelf->mDevice) \|\| (aSystemID && ! pSelf->mSysfsPath))
819	{
820	usbsysfsCleanupDevInfo(pSelf);
821	return 0;
822	}
823	return 1;
824	}
825
826	# define USBDEVICE_MAJOR 189
827
828	/**
829	* Calculate the bus (a.k.a root hub) number of a USB device from it's sysfs
830	* path.
831	*
832	* sysfs nodes representing root hubs have file names of the form
833	* usb<n>, where n is the bus number; other devices start with that number.
834	* See [http://www.linux-usb.org/FAQ.html#i6] and
835	* [http://www.kernel.org/doc/Documentation/usb/proc_usb_info.txt] for
836	* equivalent information about usbfs.
837	*
838	* @returns a bus number greater than 0 on success or 0 on failure.
839	*/
840	static unsigned usbsysfsGetBusFromPath(const char *pszPath)
841	{
842	const char *pszFile = strrchr(pszPath, '/');
843	if (!pszFile)
844	return 0;
845	unsigned bus = RTStrToUInt32(pszFile + 1);
846	if ( !bus
847	&& pszFile[1] == 'u' && pszFile[2] == 's' && pszFile[3] == 'b')
848	bus = RTStrToUInt32(pszFile + 4);
849	return bus;
850	}
851
852
853	/**
854	* Calculate the device number of a USB device.
855	*
856	* See drivers/usb/core/hub.c:usb_new_device as of Linux 2.6.20.
857	*/
858	static dev_t usbsysfsMakeDevNum(unsigned bus, unsigned device)
859	{
860	AssertReturn(bus > 0, 0);
861	AssertReturn(((device - 1) & ~127) == 0, 0);
862	AssertReturn(device > 0, 0);
863	return makedev(USBDEVICE_MAJOR, ((bus - 1) << 7) + device - 1);
864	}
865
866
867	/**
868	* If a file @a pszNode from /sys/bus/usb/devices is a device rather than an
869	* interface add an element for the device to @a pvecDevInfo.
870	*/
871	static int usbsysfsAddIfDevice(const char pszDevicesRoot, const char pszNode, VECTOR_OBJ(USBDeviceInfo) *pvecDevInfo)
872	{
873	const char *pszFile = strrchr(pszNode, '/');
874	if (!pszFile)
875	return VERR_INVALID_PARAMETER;
876	if (strchr(pszFile, ':'))
877	return VINF_SUCCESS;
878
879	unsigned bus = usbsysfsGetBusFromPath(pszNode);
880	if (!bus)
881	return VINF_SUCCESS;
882
883	int64_t device;
884	int rc = RTLinuxSysFsReadIntFile(10, &device, "%s/devnum", pszNode);
885	if (RT_FAILURE(rc))
886	return VINF_SUCCESS;
887
888	dev_t devnum = usbsysfsMakeDevNum(bus, (int)device);
889	if (!devnum)
890	return VINF_SUCCESS;
891
892	char szDevPath[RTPATH_MAX];
893	rc = RTLinuxCheckDevicePath(devnum, RTFS_TYPE_DEV_CHAR,
894	szDevPath, sizeof(szDevPath),
895	"%s/%.3d/%.3d",
896	pszDevicesRoot, bus, device);
897	if (RT_FAILURE(rc))
898	return VINF_SUCCESS;
899
900	USBDeviceInfo info;
901	if (usbsysfsInitDevInfo(&info, szDevPath, pszNode))
902	{
903	rc = VEC_PUSH_BACK_OBJ(pvecDevInfo, USBDeviceInfo, &info);
904	if (RT_SUCCESS(rc))
905	return VINF_SUCCESS;
906	}
907	usbsysfsCleanupDevInfo(&info);
908	return VERR_NO_MEMORY;
909	}
910
911
912	/**
913	* The logic for testing whether a sysfs address corresponds to an interface of
914	* a device.
915	*
916	* Both must be referenced by their canonical sysfs paths. This is not tested,
917	* as the test requires file-system interaction.
918	*/
919	static bool usbsysfsMuiIsAnInterfaceOf(const char pszIface, const char pszDev)
920	{
921	size_t cchDev = strlen(pszDev);
922
923	AssertPtr(pszIface);
924	AssertPtr(pszDev);
925	Assert(pszIface[0] == '/');
926	Assert(pszDev[0] == '/');
927	Assert(pszDev[cchDev - 1] != '/');
928
929	/* If this passes, pszIface is at least cchDev long */
930	if (strncmp(pszIface, pszDev, cchDev))
931	return false;
932
933	/* If this passes, pszIface is longer than cchDev */
934	if (pszIface[cchDev] != '/')
935	return false;
936
937	/* In sysfs an interface is an immediate subdirectory of the device */
938	if (strchr(pszIface + cchDev + 1, '/'))
939	return false;
940
941	/* And it always has a colon in its name */
942	if (!strchr(pszIface + cchDev + 1, ':'))
943	return false;
944
945	/* And hopefully we have now elimitated everything else */
946	return true;
947	}
948
949
950	# ifdef DEBUG
951	# ifdef __cplusplus
952	/** Unit test the logic in muiIsAnInterfaceOf in debug builds. */
953	class testIsAnInterfaceOf
954	{
955	public:
956	testIsAnInterfaceOf()
957	{
958	Assert(usbsysfsMuiIsAnInterfaceOf("/sys/devices/pci0000:00/0000:00:1a.0/usb3/3-0:1.0",
959	"/sys/devices/pci0000:00/0000:00:1a.0/usb3"));
960	Assert(!usbsysfsMuiIsAnInterfaceOf("/sys/devices/pci0000:00/0000:00:1a.0/usb3/3-1",
961	"/sys/devices/pci0000:00/0000:00:1a.0/usb3"));
962	Assert(!usbsysfsMuiIsAnInterfaceOf("/sys/devices/pci0000:00/0000:00:1a.0/usb3/3-0:1.0/driver",
963	"/sys/devices/pci0000:00/0000:00:1a.0/usb3"));
964	}
965	};
966	static testIsAnInterfaceOf testIsAnInterfaceOfInst;
967	# endif /* __cplusplus */
968	# endif /* DEBUG */
969
970
971	/**
972	* Tell whether a file in /sys/bus/usb/devices is an interface rather than a
973	* device.
974	*/
975	static int usbsysfsAddIfInterfaceOf(const char pszNode, USBDeviceInfo pInfo)
976	{
977	if (!usbsysfsMuiIsAnInterfaceOf(pszNode, pInfo->mSysfsPath))
978	return VINF_SUCCESS;
979
980	char pszDup = (char )RTStrDup(pszNode);
981	if (pszDup)
982	{
983	int rc = VEC_PUSH_BACK_PTR(&pInfo->mvecpszInterfaces, char *, pszDup);
984	if (RT_SUCCESS(rc))
985	return VINF_SUCCESS;
986	RTStrFree(pszDup);
987	}
988	return VERR_NO_MEMORY;
989	}
990
991
992	/**
993	* Helper for usbsysfsReadFilePaths().
994	*
995	* Adds the entries from the open directory @a pDir to the vector @a pvecpchDevs
996	* using either the full path or the realpath() and skipping hidden files and
997	* files on which realpath() fails.
998	*/
999	static int usbsysfsReadFilePathsFromDir(const char pszPath, DIR pDir, VECTOR_PTR(char ) pvecpchDevs)
1000	{
1001	struct dirent entry, *pResult;
1002	int err, rc;
1003
1004	#if RT_GNUC_PREREQ(4, 6)
1005	# pragma GCC diagnostic push
1006	# pragma GCC diagnostic ignored "-Wdeprecated-declarations"
1007	#endif
1008	for (err = readdir_r(pDir, &entry, &pResult); pResult;
1009	err = readdir_r(pDir, &entry, &pResult))
1010	#if RT_GNUC_PREREQ(4, 6)
1011	# pragma GCC diagnostic pop
1012	#endif
1013	{
1014	char szPath[RTPATH_MAX + 1];
1015	char szRealPath[RTPATH_MAX + 1];
1016	if (entry.d_name[0] == '.')
1017	continue;
1018	if (snprintf(szPath, sizeof(szPath), "%s/%s", pszPath, entry.d_name) < 0)
1019	return RTErrConvertFromErrno(errno); /** @todo r=bird: snprintf isn't document to set errno. Also, wouldn't it be better to continue on errors? Finally, you don't need to copy pszPath each time... */
1020	if (!realpath(szPath, szRealPath))
1021	return RTErrConvertFromErrno(errno);
1022	char *pszPathCopy = RTStrDup(szRealPath);
1023	if (!pszPathCopy)
1024	return VERR_NO_MEMORY;
1025	if (RT_FAILURE(rc = VEC_PUSH_BACK_PTR(pvecpchDevs, char *, pszPathCopy)))
1026	return rc;
1027	}
1028	return RTErrConvertFromErrno(err);
1029	}
1030
1031
1032	/**
1033	* Dump the names of a directory's entries into a vector of char pointers.
1034	*
1035	* @returns zero on success or (positive) posix error value.
1036	* @param pszPath the path to dump.
1037	* @param pvecpchDevs an empty vector of char pointers - must be cleaned up
1038	* by the caller even on failure.
1039	* @param withRealPath whether to canonicalise the filename with realpath
1040	*/
1041	static int usbsysfsReadFilePaths(const char pszPath, VECTOR_PTR(char ) *pvecpchDevs)
1042	{
1043	AssertPtrReturn(pvecpchDevs, EINVAL);
1044	AssertReturn(VEC_SIZE_PTR(pvecpchDevs) == 0, EINVAL);
1045	AssertPtrReturn(pszPath, EINVAL);
1046
1047	DIR *pDir = opendir(pszPath);
1048	if (!pDir)
1049	return RTErrConvertFromErrno(errno);
1050	int rc = usbsysfsReadFilePathsFromDir(pszPath, pDir, pvecpchDevs);
1051	if (closedir(pDir) < 0 && RT_SUCCESS(rc))
1052	rc = RTErrConvertFromErrno(errno);
1053	return rc;
1054	}
1055
1056
1057	/**
1058	* Logic for USBSysfsEnumerateHostDevices.
1059	*
1060	* @param pvecDevInfo vector of device information structures to add device
1061	* information to
1062	* @param pvecpchDevs empty scratch vector which will be freed by the caller,
1063	* to simplify exit logic
1064	*/
1065	static int usbsysfsEnumerateHostDevicesWorker(const char *pszDevicesRoot,
1066	VECTOR_OBJ(USBDeviceInfo) *pvecDevInfo,
1067	VECTOR_PTR(char ) pvecpchDevs)
1068	{
1069
1070	AssertPtrReturn(pvecDevInfo, VERR_INVALID_POINTER);
1071	LogFlowFunc (("pvecDevInfo=%p\n", pvecDevInfo));
1072
1073	int rc = usbsysfsReadFilePaths("/sys/bus/usb/devices", pvecpchDevs);
1074	if (RT_FAILURE(rc))
1075	return rc;
1076
1077	char **ppszEntry;
1078	VEC_FOR_EACH(pvecpchDevs, char *, ppszEntry)
1079	{
1080	rc = usbsysfsAddIfDevice(pszDevicesRoot, *ppszEntry, pvecDevInfo);
1081	if (RT_FAILURE(rc))
1082	return rc;
1083	}
1084
1085	USBDeviceInfo *pInfo;
1086	VEC_FOR_EACH(pvecDevInfo, USBDeviceInfo, pInfo)
1087	VEC_FOR_EACH(pvecpchDevs, char *, ppszEntry)
1088	{
1089	rc = usbsysfsAddIfInterfaceOf(*ppszEntry, pInfo);
1090	if (RT_FAILURE(rc))
1091	return rc;
1092	}
1093	return VINF_SUCCESS;
1094	}
1095
1096
1097	static int usbsysfsEnumerateHostDevices(const char pszDevicesRoot, VECTOR_OBJ(USBDeviceInfo) pvecDevInfo)
1098	{
1099	VECTOR_PTR(char *) vecpchDevs;
1100
1101	AssertReturn(VEC_SIZE_OBJ(pvecDevInfo) == 0, VERR_INVALID_PARAMETER);
1102	LogFlowFunc(("entered\n"));
1103	VEC_INIT_PTR(&vecpchDevs, char *, RTStrFree);
1104	int rc = usbsysfsEnumerateHostDevicesWorker(pszDevicesRoot, pvecDevInfo, &vecpchDevs);
1105	VEC_CLEANUP_PTR(&vecpchDevs);
1106	LogFlowFunc(("rc=%Rrc\n", rc));
1107	return rc;
1108	}
1109
1110
1111	/**
1112	* Helper function for extracting the port number on the parent device from
1113	* the sysfs path value.
1114	*
1115	* The sysfs path is a chain of elements separated by forward slashes, and for
1116	* USB devices, the last element in the chain takes the form
1117	* <port>-<port>.[...].<port>[:<config>.<interface>]
1118	* where the first <port> is the port number on the root hub, and the following
1119	* (optional) ones are the port numbers on any other hubs between the device
1120	* and the root hub. The last part (:<config.interface>) is only present for
1121	* interfaces, not for devices. This API should only be called for devices.
1122	* For compatibility with usbfs, which enumerates from zero up, we subtract one
1123	* from the port number.
1124	*
1125	* For root hubs, the last element in the chain takes the form
1126	* usb<hub number>
1127	* and usbfs always returns port number zero.
1128	*
1129	* @returns VBox status code. pu8Port is set on success.
1130	* @param pszPath The sysfs path to parse.
1131	* @param pu8Port Where to store the port number.
1132	*/
1133	static int usbsysfsGetPortFromStr(const char pszPath, uint8_t pu8Port)
1134	{
1135	AssertPtrReturn(pszPath, VERR_INVALID_POINTER);
1136	AssertPtrReturn(pu8Port, VERR_INVALID_POINTER);
1137
1138	/*
1139	* This should not be possible until we get PCs with USB as their primary bus.
1140	* Note: We don't assert this, as we don't expect the caller to validate the
1141	* sysfs path.
1142	*/
1143	const char *pszLastComp = strrchr(pszPath, '/');
1144	if (!pszLastComp)
1145	{
1146	Log(("usbGetPortFromSysfsPath(%s): failed [1]\n", pszPath));
1147	return VERR_INVALID_PARAMETER;
1148	}
1149	pszLastComp++; /* skip the slash */
1150
1151	/*
1152	* This API should not be called for interfaces, so the last component
1153	* of the path should not contain a colon. We do assert this, as it
1154	* might indicate a caller bug.
1155	*/
1156	AssertMsgReturn(strchr(pszLastComp, ':') == NULL, ("%s\n", pszPath), VERR_INVALID_PARAMETER);
1157
1158	/*
1159	* Look for the start of the last number.
1160	*/
1161	const char *pchDash = strrchr(pszLastComp, '-');
1162	const char *pchDot = strrchr(pszLastComp, '.');
1163	if (!pchDash && !pchDot)
1164	{
1165	/* No -/. so it must be a root hub. Check that it's usb<something>. */
1166	if (strncmp(pszLastComp, RT_STR_TUPLE("usb")) != 0)
1167	{
1168	Log(("usbGetPortFromSysfsPath(%s): failed [2]\n", pszPath));
1169	return VERR_INVALID_PARAMETER;
1170	}
1171	return VERR_NOT_SUPPORTED;
1172	}
1173
1174	const char *pszLastPort = pchDot != NULL
1175	? pchDot + 1
1176	: pchDash + 1;
1177	int rc = RTStrToUInt8Full(pszLastPort, 10, pu8Port);
1178	if (rc != VINF_SUCCESS)
1179	{
1180	Log(("usbGetPortFromSysfsPath(%s): failed [3], rc=%Rrc\n", pszPath, rc));
1181	return VERR_INVALID_PARAMETER;
1182	}
1183	if (*pu8Port == 0)
1184	{
1185	Log(("usbGetPortFromSysfsPath(%s): failed [4]\n", pszPath));
1186	return VERR_INVALID_PARAMETER;
1187	}
1188
1189	/* usbfs compatibility, 0-based port number. */
1190	pu8Port = (uint8_t)(pu8Port - 1);
1191	return VINF_SUCCESS;
1192	}
1193
1194
1195	/**
1196	* Converts a sysfs BCD value into a uint16_t.
1197	*
1198	* In contrast to usbReadBCD() this function can handle BCD values without
1199	* a decimal separator. This is necessary for parsing bcdDevice.
1200	*
1201	* @param pszBuf Pointer to the string buffer.
1202	* @param pu15 Pointer to the return value.
1203	* @returns IPRT status code.
1204	*/
1205	static int usbsysfsConvertStrToBCD(const char pszBuf, uint16_t pu16)
1206	{
1207	char *pszNext;
1208	int32_t i32;
1209
1210	pszBuf = RTStrStripL(pszBuf);
1211	int rc = RTStrToInt32Ex(pszBuf, &pszNext, 16, &i32);
1212	if ( RT_FAILURE(rc)
1213	\|\| rc == VWRN_NUMBER_TOO_BIG
1214	\|\| i32 < 0)
1215	return VERR_NUMBER_TOO_BIG;
1216	if (*pszNext == '.')
1217	{
1218	if (i32 > 255)
1219	return VERR_NUMBER_TOO_BIG;
1220	int32_t i32Lo;
1221	rc = RTStrToInt32Ex(pszNext+1, &pszNext, 16, &i32Lo);
1222	if ( RT_FAILURE(rc)
1223	\|\| rc == VWRN_NUMBER_TOO_BIG
1224	\|\| i32Lo > 255
1225	\|\| i32Lo < 0)
1226	return VERR_NUMBER_TOO_BIG;
1227	i32 = (i32 << 8) \| i32Lo;
1228	}
1229	if ( i32 > 65535
1230	\|\| (pszNext != '\0' && pszNext != ' '))
1231	return VERR_NUMBER_TOO_BIG;
1232
1233	*pu16 = (uint16_t)i32;
1234	return VINF_SUCCESS;
1235	}
1236
1237
1238	/**
1239	* Returns the byte value for the given device property or sets the given default if an
1240	* error occurs while obtaining it.
1241	*
1242	* @returns uint8_t value of the given property.
1243	* @param uBase The base of the number in the sysfs property.
1244	* @param bDef The default to set on error.
1245	* @param pszFormat The format string for the property.
1246	* @param ... Arguments for the format string.
1247	*/
1248	static uint8_t usbsysfsReadDevicePropertyU8Def(unsigned uBase, uint8_t bDef, const char *pszFormat, ...)
1249	{
1250	int64_t i64Tmp = 0;
1251
1252	va_list va;
1253	va_start(va, pszFormat);
1254	int rc = RTLinuxSysFsReadIntFileV(uBase, &i64Tmp, pszFormat, va);
1255	va_end(va);
1256	if (RT_SUCCESS(rc))
1257	return (uint8_t)i64Tmp;
1258	else
1259	return bDef;
1260	}
1261
1262
1263	/**
1264	* Returns the uint16_t value for the given device property or sets the given default if an
1265	* error occurs while obtaining it.
1266	*
1267	* @returns uint16_t value of the given property.
1268	* @param uBase The base of the number in the sysfs property.
1269	* @param u16Def The default to set on error.
1270	* @param pszFormat The format string for the property.
1271	* @param ... Arguments for the format string.
1272	*/
1273	static uint16_t usbsysfsReadDevicePropertyU16Def(unsigned uBase, uint16_t u16Def, const char *pszFormat, ...)
1274	{
1275	int64_t i64Tmp = 0;
1276
1277	va_list va;
1278	va_start(va, pszFormat);
1279	int rc = RTLinuxSysFsReadIntFileV(uBase, &i64Tmp, pszFormat, va);
1280	va_end(va);
1281	if (RT_SUCCESS(rc))
1282	return (uint16_t)i64Tmp;
1283	else
1284	return u16Def;
1285	}
1286
1287
1288	static void usbsysfsFillInDevice(USBDEVICE pDev, USBDeviceInfo pInfo)
1289	{
1290	int rc;
1291	const char *pszSysfsPath = pInfo->mSysfsPath;
1292
1293	/* Fill in the simple fields */
1294	pDev->enmState = USBDEVICESTATE_UNUSED;
1295	pDev->bBus = (uint8_t)usbsysfsGetBusFromPath(pszSysfsPath);
1296	pDev->bDeviceClass = usbsysfsReadDevicePropertyU8Def(16, 0, "%s/bDeviceClass", pszSysfsPath);
1297	pDev->bDeviceSubClass = usbsysfsReadDevicePropertyU8Def(16, 0, "%s/bDeviceSubClass", pszSysfsPath);
1298	pDev->bDeviceProtocol = usbsysfsReadDevicePropertyU8Def(16, 0, "%s/bDeviceProtocol", pszSysfsPath);
1299	pDev->bNumConfigurations = usbsysfsReadDevicePropertyU8Def(10, 0, "%s/bNumConfigurations", pszSysfsPath);
1300	pDev->idVendor = usbsysfsReadDevicePropertyU16Def(16, 0, "%s/idVendor", pszSysfsPath);
1301	pDev->idProduct = usbsysfsReadDevicePropertyU16Def(16, 0, "%s/idProduct", pszSysfsPath);
1302	pDev->bDevNum = usbsysfsReadDevicePropertyU8Def(10, 0, "%s/devnum", pszSysfsPath);
1303
1304	/* Now deal with the non-numeric bits. */
1305	char szBuf[1024]; /* Should be larger than anything a sane device
1306	* will need, and insane devices can be unsupported
1307	* until further notice. */
1308	size_t cchRead;
1309
1310	/* For simplicity, we just do strcmps on the next one. */
1311	rc = RTLinuxSysFsReadStrFile(szBuf, sizeof(szBuf), &cchRead, "%s/speed", pszSysfsPath);
1312	if (RT_FAILURE(rc) \|\| cchRead == sizeof(szBuf))
1313	pDev->enmState = USBDEVICESTATE_UNSUPPORTED;
1314	else
1315	pDev->enmSpeed = !strcmp(szBuf, "1.5") ? USBDEVICESPEED_LOW
1316	: !strcmp(szBuf, "12") ? USBDEVICESPEED_FULL
1317	: !strcmp(szBuf, "480") ? USBDEVICESPEED_HIGH
1318	: !strcmp(szBuf, "5000") ? USBDEVICESPEED_SUPER
1319	: USBDEVICESPEED_UNKNOWN;
1320
1321	rc = RTLinuxSysFsReadStrFile(szBuf, sizeof(szBuf), &cchRead, "%s/version", pszSysfsPath);
1322	if (RT_FAILURE(rc) \|\| cchRead == sizeof(szBuf))
1323	pDev->enmState = USBDEVICESTATE_UNSUPPORTED;
1324	else
1325	{
1326	rc = usbsysfsConvertStrToBCD(szBuf, &pDev->bcdUSB);
1327	if (RT_FAILURE(rc))
1328	{
1329	pDev->enmState = USBDEVICESTATE_UNSUPPORTED;
1330	pDev->bcdUSB = UINT16_MAX;
1331	}
1332	}
1333
1334	rc = RTLinuxSysFsReadStrFile(szBuf, sizeof(szBuf), &cchRead, "%s/bcdDevice", pszSysfsPath);
1335	if (RT_FAILURE(rc) \|\| cchRead == sizeof(szBuf))
1336	pDev->bcdDevice = UINT16_MAX;
1337	else
1338	{
1339	rc = usbsysfsConvertStrToBCD(szBuf, &pDev->bcdDevice);
1340	if (RT_FAILURE(rc))
1341	pDev->bcdDevice = UINT16_MAX;
1342	}
1343
1344	/* Now do things that need string duplication */
1345	rc = RTLinuxSysFsReadStrFile(szBuf, sizeof(szBuf), &cchRead, "%s/product", pszSysfsPath);
1346	if (RT_SUCCESS(rc) && cchRead < sizeof(szBuf))
1347	{
1348	USBLibPurgeEncoding(szBuf);
1349	pDev->pszProduct = RTStrDup(szBuf);
1350	}
1351
1352	rc = RTLinuxSysFsReadStrFile(szBuf, sizeof(szBuf), &cchRead, "%s/serial", pszSysfsPath);
1353	if (RT_SUCCESS(rc) && cchRead < sizeof(szBuf))
1354	{
1355	USBLibPurgeEncoding(szBuf);
1356	pDev->pszSerialNumber = RTStrDup(szBuf);
1357	pDev->u64SerialHash = USBLibHashSerial(szBuf);
1358	}
1359
1360	rc = RTLinuxSysFsReadStrFile(szBuf, sizeof(szBuf), &cchRead, "%s/manufacturer", pszSysfsPath);
1361	if (RT_SUCCESS(rc) && cchRead < sizeof(szBuf))
1362	{
1363	USBLibPurgeEncoding(szBuf);
1364	pDev->pszManufacturer = RTStrDup(szBuf);
1365	}
1366
1367	/* Work out the port number */
1368	if (RT_FAILURE(usbsysfsGetPortFromStr(pszSysfsPath, &pDev->bPort)))
1369	pDev->enmState = USBDEVICESTATE_UNSUPPORTED;
1370
1371	/* Check the interfaces to see if we can support the device. */
1372	char **ppszIf;
1373	VEC_FOR_EACH(&pInfo->mvecpszInterfaces, char *, ppszIf)
1374	{
1375	rc = RTLinuxSysFsGetLinkDest(szBuf, sizeof(szBuf), NULL, "%s/driver", *ppszIf);
1376	if (RT_SUCCESS(rc) && pDev->enmState != USBDEVICESTATE_UNSUPPORTED)
1377	pDev->enmState = (strcmp(szBuf, "hub") == 0)
1378	? USBDEVICESTATE_UNSUPPORTED
1379	: USBDEVICESTATE_USED_BY_HOST_CAPTURABLE;
1380	if (usbsysfsReadDevicePropertyU8Def(16, 9 /* bDev /, "%s/bInterfaceClass", ppszIf) == 9 /* hub */)
1381	pDev->enmState = USBDEVICESTATE_UNSUPPORTED;
1382	}
1383
1384	/* We use a double slash as a separator in the pszAddress field. This is
1385	* alright as the two paths can't contain a slash due to the way we build
1386	* them. */
1387	char *pszAddress = NULL;
1388	RTStrAPrintf(&pszAddress, "sysfs:%s//device:%s", pszSysfsPath, pInfo->mDevice);
1389	pDev->pszAddress = pszAddress;
1390	pDev->pszBackend = RTStrDup("host");
1391
1392	/* Work out from the data collected whether we can support this device. */
1393	pDev->enmState = usbDeterminState(pDev);
1394	usbLogDevice(pDev);
1395	}
1396
1397
1398	/**
1399	* USBProxyService::getDevices() implementation for sysfs.
1400	*/
1401	static PUSBDEVICE usbsysfsGetDevices(const char *pszDevicesRoot, bool fUnsupportedDevicesToo)
1402	{
1403	/* Add each of the devices found to the chain. */
1404	PUSBDEVICE pFirst = NULL;
1405	PUSBDEVICE pLast = NULL;
1406	VECTOR_OBJ(USBDeviceInfo) vecDevInfo;
1407	USBDeviceInfo *pInfo;
1408	int rc;
1409
1410	VEC_INIT_OBJ(&vecDevInfo, USBDeviceInfo, usbsysfsCleanupDevInfo);
1411	rc = usbsysfsEnumerateHostDevices(pszDevicesRoot, &vecDevInfo);
1412	if (RT_FAILURE(rc))
1413	return NULL;
1414	VEC_FOR_EACH(&vecDevInfo, USBDeviceInfo, pInfo)
1415	{
1416	USBDEVICE pDev = (USBDEVICE )RTMemAllocZ(sizeof(USBDEVICE));
1417	if (!pDev)
1418	rc = VERR_NO_MEMORY;
1419	if (RT_SUCCESS(rc))
1420	usbsysfsFillInDevice(pDev, pInfo);
1421	if ( RT_SUCCESS(rc)
1422	&& ( pDev->enmState != USBDEVICESTATE_UNSUPPORTED
1423	\|\| fUnsupportedDevicesToo)
1424	&& pDev->pszAddress != NULL
1425	)
1426	{
1427	if (pLast != NULL)
1428	{
1429	pLast->pNext = pDev;
1430	pLast = pLast->pNext;
1431	}
1432	else
1433	pFirst = pLast = pDev;
1434	}
1435	else
1436	deviceFree(pDev);
1437	if (RT_FAILURE(rc))
1438	break;
1439	}
1440	if (RT_FAILURE(rc))
1441	deviceListFree(&pFirst);
1442
1443	VEC_CLEANUP_OBJ(&vecDevInfo);
1444	return pFirst;
1445	}
1446
1447	#endif /* VBOX_USB_WITH_SYSFS */
1448	#ifdef UNIT_TEST
1449
1450	/* Set up mock functions for USBProxyLinuxCheckDeviceRoot - here dlsym and close
1451	* for the inotify presence check. */
1452	static int testInotifyInitGood(void) { return 0; }
1453	static int testInotifyInitBad(void) { return -1; }
1454	static bool s_fHaveInotifyLibC = true;
1455	static bool s_fHaveInotifyKernel = true;
1456
1457	static void testDLSym(void handle, const char *symbol)
1458	{
1459	RT_NOREF(handle, symbol);
1460	Assert(handle == RTLD_DEFAULT);
1461	Assert(!RTStrCmp(symbol, "inotify_init"));
1462	if (!s_fHaveInotifyLibC)
1463	return NULL;
1464	if (s_fHaveInotifyKernel)
1465	return (void *)(uintptr_t)testInotifyInitGood;
1466	return (void *)(uintptr_t)testInotifyInitBad;
1467	}
1468
1469	void TestUSBSetInotifyAvailable(bool fHaveInotifyLibC, bool fHaveInotifyKernel)
1470	{
1471	s_fHaveInotifyLibC = fHaveInotifyLibC;
1472	s_fHaveInotifyKernel = fHaveInotifyKernel;
1473	}
1474	# define dlsym testDLSym
1475	# define close(a) do {} while (0)
1476
1477	#endif /* UNIT_TEST */
1478
1479	/**
1480	* Is inotify available and working on this system?
1481	*
1482	* This is a requirement for using USB with sysfs
1483	*/
1484	static bool usbsysfsInotifyAvailable(void)
1485	{
1486	int (*inotify_init)(void);
1487
1488	(void *)(&inotify_init) = dlsym(RTLD_DEFAULT, "inotify_init");
1489	if (!inotify_init)
1490	return false;
1491	int fd = inotify_init();
1492	if (fd == -1)
1493	return false;
1494	close(fd);
1495	return true;
1496	}
1497
1498	#ifdef UNIT_TEST
1499
1500	# undef dlsym
1501	# undef close
1502
1503	/** Unit test list of usbfs addresses of connected devices. */
1504	static const char **g_papszUsbfsDeviceAddresses = NULL;
1505
1506	static PUSBDEVICE testGetUsbfsDevices(const char *pszUsbfsRoot, bool fUnsupportedDevicesToo)
1507	{
1508	RT_NOREF(pszUsbfsRoot, fUnsupportedDevicesToo);
1509	const char **psz;
1510	PUSBDEVICE pList = NULL, pTail = NULL;
1511	for (psz = g_papszUsbfsDeviceAddresses; psz && *psz; ++psz)
1512	{
1513	PUSBDEVICE pNext = (PUSBDEVICE)RTMemAllocZ(sizeof(USBDEVICE));
1514	if (pNext)
1515	pNext->pszAddress = RTStrDup(*psz);
1516	if (!pNext \|\| !pNext->pszAddress)
1517	{
1518	if (pNext)
1519	RTMemFree(pNext);
1520	deviceListFree(&pList);
1521	return NULL;
1522	}
1523	if (pTail)
1524	pTail->pNext = pNext;
1525	else
1526	pList = pNext;
1527	pTail = pNext;
1528	}
1529	return pList;
1530	}
1531	# define usbfsGetDevices testGetUsbfsDevices
1532
1533	/**
1534	* Specify the list of devices that will appear to be available through
1535	* usbfs during unit testing (of USBProxyLinuxGetDevices)
1536	* @param pacszDeviceAddresses NULL terminated array of usbfs device addresses
1537	*/
1538	void TestUSBSetAvailableUsbfsDevices(const char **papszDeviceAddresses)
1539	{
1540	g_papszUsbfsDeviceAddresses = papszDeviceAddresses;
1541	}
1542
1543	/** Unit test list of files reported as accessible by access(3). We only do
1544	* accessible or not accessible. */
1545	static const char **g_papszAccessibleFiles = NULL;
1546
1547	static int testAccess(const char *pszPath, int mode)
1548	{
1549	RT_NOREF(mode);
1550	const char **psz;
1551	for (psz = g_papszAccessibleFiles; psz && *psz; ++psz)
1552	if (!RTStrCmp(pszPath, *psz))
1553	return 0;
1554	return -1;
1555	}
1556	# define access testAccess
1557
1558
1559	/**
1560	* Specify the list of files that access will report as accessible (at present
1561	* we only do accessible or not accessible) during unit testing (of
1562	* USBProxyLinuxGetDevices)
1563	* @param papszAccessibleFiles NULL terminated array of file paths to be
1564	* reported accessible
1565	*/
1566	void TestUSBSetAccessibleFiles(const char **papszAccessibleFiles)
1567	{
1568	g_papszAccessibleFiles = papszAccessibleFiles;
1569	}
1570
1571
1572	/** The path we pretend the usbfs root is located at, or NULL. */
1573	const char *s_pszTestUsbfsRoot;
1574	/** Should usbfs be accessible to the current user? */
1575	bool s_fTestUsbfsAccessible;
1576	/** The path we pretend the device node tree root is located at, or NULL. */
1577	const char *s_pszTestDevicesRoot;
1578	/** Should the device node tree be accessible to the current user? */
1579	bool s_fTestDevicesAccessible;
1580	/** The result of the usbfs/inotify-specific init */
1581	int s_rcTestMethodInitResult;
1582	/** The value of the VBOX_USB environment variable. */
1583	const char *s_pszTestEnvUsb;
1584	/** The value of the VBOX_USB_ROOT environment variable. */
1585	const char *s_pszTestEnvUsbRoot;
1586
1587
1588	/** Select which access methods will be available to the @a init method
1589	* during unit testing, and (hack!) what return code it will see from
1590	* the access method-specific initialisation. */
1591	void TestUSBSetupInit(const char *pszUsbfsRoot, bool fUsbfsAccessible,
1592	const char *pszDevicesRoot, bool fDevicesAccessible,
1593	int rcMethodInitResult)
1594	{
1595	s_pszTestUsbfsRoot = pszUsbfsRoot;
1596	s_fTestUsbfsAccessible = fUsbfsAccessible;
1597	s_pszTestDevicesRoot = pszDevicesRoot;
1598	s_fTestDevicesAccessible = fDevicesAccessible;
1599	s_rcTestMethodInitResult = rcMethodInitResult;
1600	}
1601
1602
1603	/** Specify the environment that the @a init method will see during unit
1604	* testing. */
1605	void TestUSBSetEnv(const char pszEnvUsb, const char pszEnvUsbRoot)
1606	{
1607	s_pszTestEnvUsb = pszEnvUsb;
1608	s_pszTestEnvUsbRoot = pszEnvUsbRoot;
1609	}
1610
1611	/* For testing we redefine anything that accesses the outside world to
1612	* return test values. */
1613	# define RTEnvGet(a) \
1614	( !RTStrCmp(a, "VBOX_USB") ? s_pszTestEnvUsb \
1615	: !RTStrCmp(a, "VBOX_USB_ROOT") ? s_pszTestEnvUsbRoot \
1616	: NULL)
1617	# define USBProxyLinuxCheckDeviceRoot(pszPath, fUseNodes) \
1618	( ((fUseNodes) && s_fTestDevicesAccessible \
1619	&& !RTStrCmp(pszPath, s_pszTestDevicesRoot)) \
1620	\|\| (!(fUseNodes) && s_fTestUsbfsAccessible \
1621	&& !RTStrCmp(pszPath, s_pszTestUsbfsRoot)))
1622	# define RTDirExists(pszDir) \
1623	( (pszDir) \
1624	&& ( !RTStrCmp(pszDir, s_pszTestDevicesRoot) \
1625	\|\| !RTStrCmp(pszDir, s_pszTestUsbfsRoot)))
1626	# define RTFileExists(pszFile) \
1627	( (pszFile) \
1628	&& s_pszTestUsbfsRoot \
1629	&& !RTStrNCmp(pszFile, s_pszTestUsbfsRoot, strlen(s_pszTestUsbfsRoot)) \
1630	&& !RTStrCmp(pszFile + strlen(s_pszTestUsbfsRoot), "/devices"))
1631
1632	#endif /* UNIT_TEST */
1633
1634	/**
1635	* Use USBFS-like or sysfs/device node-like access method?
1636	*
1637	* Selects the access method that will be used to access USB devices based on
1638	* what is available on the host and what if anything the user has specified
1639	* in the environment.
1640	*
1641	* @returns iprt status value
1642	* @param pfUsingUsbfsDevices on success this will be set to true if
1643	* the prefered access method is USBFS-like and to
1644	* false if it is sysfs/device node-like
1645	* @param ppszDevicesRoot on success the root of the tree of USBFS-like
1646	* device nodes will be stored here
1647	*/
1648	int USBProxyLinuxChooseMethod(bool pfUsingUsbfsDevices, const char *ppszDevicesRoot)
1649	{
1650	/*
1651	* We have two methods available for getting host USB device data - using
1652	* USBFS and using sysfs. The default choice is sysfs; if that is not
1653	* available we fall back to USBFS.
1654	* In the event of both failing, an appropriate error will be returned.
1655	* The user may also specify a method and root using the VBOX_USB and
1656	* VBOX_USB_ROOT environment variables. In this case we don't check
1657	* the root they provide for validity.
1658	*/
1659	bool fUsbfsChosen = false;
1660	bool fSysfsChosen = false;
1661	const char *pszUsbFromEnv = RTEnvGet("VBOX_USB");
1662	const char *pszUsbRoot = NULL;
1663	if (pszUsbFromEnv)
1664	{
1665	bool fValidVBoxUSB = true;
1666
1667	pszUsbRoot = RTEnvGet("VBOX_USB_ROOT");
1668	if (!RTStrICmp(pszUsbFromEnv, "USBFS"))
1669	{
1670	LogRel(("Default USB access method set to \"usbfs\" from environment\n"));
1671	fUsbfsChosen = true;
1672	}
1673	else if (!RTStrICmp(pszUsbFromEnv, "SYSFS"))
1674	{
1675	LogRel(("Default USB method set to \"sysfs\" from environment\n"));
1676	fSysfsChosen = true;
1677	}
1678	else
1679	{
1680	LogRel(("Invalid VBOX_USB environment variable setting \"%s\"\n", pszUsbFromEnv));
1681	fValidVBoxUSB = false;
1682	pszUsbFromEnv = NULL;
1683	}
1684	if (!fValidVBoxUSB && pszUsbRoot)
1685	pszUsbRoot = NULL;
1686	}
1687	if (!pszUsbRoot)
1688	{
1689	if ( !fUsbfsChosen
1690	&& USBProxyLinuxCheckDeviceRoot("/dev/vboxusb", true))
1691	{
1692	fSysfsChosen = true;
1693	pszUsbRoot = "/dev/vboxusb";
1694	}
1695	else if ( !fSysfsChosen
1696	&& USBProxyLinuxCheckDeviceRoot("/proc/bus/usb", false))
1697	{
1698	fUsbfsChosen = true;
1699	pszUsbRoot = "/proc/bus/usb";
1700	}
1701	}
1702	else if (!USBProxyLinuxCheckDeviceRoot(pszUsbRoot, fSysfsChosen))
1703	pszUsbRoot = NULL;
1704	if (pszUsbRoot)
1705	{
1706	*pfUsingUsbfsDevices = fUsbfsChosen;
1707	*ppszDevicesRoot = pszUsbRoot;
1708	return VINF_SUCCESS;
1709	}
1710	/* else */
1711	return pszUsbFromEnv ? VERR_NOT_FOUND
1712	: RTDirExists("/dev/vboxusb") ? VERR_VUSB_USB_DEVICE_PERMISSION
1713	: RTFileExists("/proc/bus/usb/devices") ? VERR_VUSB_USBFS_PERMISSION
1714	: VERR_NOT_FOUND;
1715	}
1716
1717	#ifdef UNIT_TEST
1718	# undef RTEnvGet
1719	# undef USBProxyLinuxCheckDeviceRoot
1720	# undef RTDirExists
1721	# undef RTFileExists
1722	#endif
1723
1724	/**
1725	* Check whether a USB device tree root is usable.
1726	*
1727	* @param pszRoot the path to the root of the device tree
1728	* @param fIsDeviceNodes whether this is a device node (or usbfs) tree
1729	* @note returns a pointer into a static array so it will stay valid
1730	*/
1731	bool USBProxyLinuxCheckDeviceRoot(const char *pszRoot, bool fIsDeviceNodes)
1732	{
1733	bool fOK = false;
1734	if (!fIsDeviceNodes) /* usbfs */
1735	{
1736	#ifdef VBOX_USB_WITH_USBFS
1737	if (!access(pszRoot, R_OK \| X_OK))
1738	{
1739	fOK = true;
1740	PUSBDEVICE pDevices = usbfsGetDevices(pszRoot, true);
1741	if (pDevices)
1742	{
1743	PUSBDEVICE pDevice;
1744	for (pDevice = pDevices; pDevice && fOK; pDevice = pDevice->pNext)
1745	if (access(pDevice->pszAddress, R_OK \| W_OK))
1746	fOK = false;
1747	deviceListFree(&pDevices);
1748	}
1749	}
1750	#endif
1751	}
1752	#ifdef VBOX_USB_WITH_SYSFS
1753	/* device nodes */
1754	else if (usbsysfsInotifyAvailable() && !access(pszRoot, R_OK \| X_OK))
1755	fOK = true;
1756	#endif
1757	return fOK;
1758	}
1759
1760	#ifdef UNIT_TEST
1761	# undef usbfsGetDevices
1762	# undef access
1763	#endif
1764
1765	/**
1766	* Get the list of USB devices supported by the system.
1767	*
1768	* Result should be freed using #deviceFree or something equivalent.
1769	*
1770	* @param pszDevicesRoot the path to the root of the device tree
1771	* @param fUseSysfs whether to use sysfs (or usbfs) for enumeration
1772	*/
1773	PUSBDEVICE USBProxyLinuxGetDevices(const char *pszDevicesRoot, bool fUseSysfs)
1774	{
1775	if (!fUseSysfs)
1776	{
1777	#ifdef VBOX_USB_WITH_USBFS
1778	return usbfsGetDevices(pszDevicesRoot, false);
1779	#else
1780	return NULL;
1781	#endif
1782	}
1783
1784	#ifdef VBOX_USB_WITH_SYSFS
1785	return usbsysfsGetDevices(pszDevicesRoot, false);
1786	#else
1787	return NULL;
1788	#endif
1789	}
1790

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source: vbox/trunk/src/VBox/Main/src-server/linux/USBGetDevices.cpp@ 69731

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