USBGetDevices.cpp@ 34941

Last change on this file since 34941 was 34716, checked in by vboxsync, 14 years ago
Main/linux/USB: more thorough checks for the different USB probing methods
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1	/* $Id: USBGetDevices.cpp 34716 2010-12-03 23:33:04Z vboxsync $ */
2	/** @file
3	* VirtualBox Linux host USB device enumeration.
4	*/
5
6	/*
7	* Copyright (C) 2006-2010 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
18
19	/*******************************************************************************
20	* Header Files *
21	*******************************************************************************/
22
23	#include "USBGetDevices.h"
24
25	#include <VBox/usb.h>
26	#include <VBox/usblib.h>
27
28	#include <iprt/linux/sysfs.h>
29	#include <iprt/cdefs.h>
30	#include <iprt/ctype.h>
31	#include <iprt/err.h>
32	#include <iprt/fs.h>
33	#include <iprt/log.h>
34	#include <iprt/mem.h>
35	#include <iprt/param.h>
36	#include <iprt/path.h>
37	#include <iprt/string.h>
38	#include "vector.h"
39
40	#ifdef VBOX_WITH_LINUX_COMPILER_H
41	# include <linux/compiler.h>
42	#endif
43	#include <linux/usbdevice_fs.h>
44
45	#include <sys/types.h>
46	#include <sys/stat.h>
47	#include <sys/vfs.h>
48
49	#include <dirent.h>
50	#include <dlfcn.h>
51	#include <errno.h>
52	#include <fcntl.h>
53	#include <stdio.h>
54	#include <string.h>
55	#include <unistd.h>
56
57	/*******************************************************************************
58	* Structures and Typedefs *
59	*******************************************************************************/
60	/** Suffix translation. */
61	typedef struct USBSUFF
62	{
63	char szSuff[4];
64	unsigned cchSuff;
65	unsigned uMul;
66	unsigned uDiv;
67	} USBSUFF, *PUSBSUFF;
68	typedef const USBSUFF *PCUSBSUFF;
69
70	/** Structure describing a host USB device */
71	typedef struct USBDeviceInfo
72	{
73	/** The device node of the device. */
74	char *mDevice;
75	/** The system identifier of the device. Specific to the probing
76	* method. */
77	char *mSysfsPath;
78	/** List of interfaces as sysfs paths */
79	VECTOR_PTR(char *) mvecpszInterfaces;
80	} USBDeviceInfo;
81
82	/*******************************************************************************
83	* Global Variables *
84	*******************************************************************************/
85	/**
86	* Suffixes for the endpoint polling interval.
87	*/
88	static const USBSUFF s_aIntervalSuff[] =
89	{
90	{ "ms", 2, 1, 0 },
91	{ "us", 2, 1, 1000 },
92	{ "ns", 2, 1, 1000000 },
93	{ "s", 1, 1000, 0 },
94	{ "", 0, 0, 0 } /* term */
95	};
96
97	/**
98	* List of well-known USB device tree locations.
99	*/
100	static const USBDEVTREELOCATION s_aTreeLocations[] =
101	{
102	{ "/proc/bus/usb", false },
103	{ "/dev/bus/usb", false },
104	{ "/dev/vboxusb", true },
105	{ "/dev/bus/usb", true },
106	};
107
108
109	/**
110	* "reads" the number suffix. It's more like validating it and
111	* skipping the necessary number of chars.
112	*/
113	static int usbReadSkipSuffix(char **ppszNext)
114	{
115	char pszNext = ppszNext;
116	if (!RT_C_IS_SPACE(pszNext) && pszNext)
117	{
118	/* skip unit */
119	if (pszNext[0] == 'm' && pszNext[1] == 's')
120	pszNext += 2;
121	else if (pszNext[0] == 'm' && pszNext[1] == 'A')
122	pszNext += 2;
123
124	/* skip parenthesis */
125	if (*pszNext == '(')
126	{
127	pszNext = strchr(pszNext, ')');
128	if (!pszNext++)
129	{
130	AssertMsgFailed(("ppszNext=%s\n", ppszNext));
131	return VERR_PARSE_ERROR;
132	}
133	}
134
135	/* blank or end of the line. */
136	if (!RT_C_IS_SPACE(pszNext) && pszNext)
137	{
138	AssertMsgFailed(("pszNext=%s\n", pszNext));
139	return VERR_PARSE_ERROR;
140	}
141
142	/* it's ok. */
143	*ppszNext = pszNext;
144	}
145
146	return VINF_SUCCESS;
147	}
148
149
150	/**
151	* Reads a USB number returning the number and the position of the next character to parse.
152	*/
153	static int usbReadNum(const char pszValue, unsigned uBase, uint32_t u32Mask, PCUSBSUFF paSuffs, void pvNum, char **ppszNext)
154	{
155	/*
156	* Initialize return value to zero and strip leading spaces.
157	*/
158	switch (u32Mask)
159	{
160	case 0xff: (uint8_t )pvNum = 0; break;
161	case 0xffff: (uint16_t )pvNum = 0; break;
162	case 0xffffffff: (uint32_t )pvNum = 0; break;
163	}
164	pszValue = RTStrStripL(pszValue);
165	if (*pszValue)
166	{
167	/*
168	* Try convert the number.
169	*/
170	char *pszNext;
171	uint32_t u32 = 0;
172	RTStrToUInt32Ex(pszValue, &pszNext, uBase, &u32);
173	if (pszNext == pszValue)
174	{
175	AssertMsgFailed(("pszValue=%d\n", pszValue));
176	return VERR_NO_DATA;
177	}
178
179	/*
180	* Check the range.
181	*/
182	if (u32 & ~u32Mask)
183	{
184	AssertMsgFailed(("pszValue=%d u32=%#x lMask=%#x\n", pszValue, u32, u32Mask));
185	return VERR_OUT_OF_RANGE;
186	}
187
188	/*
189	* Validate and skip stuff following the number.
190	*/
191	if (paSuffs)
192	{
193	if (!RT_C_IS_SPACE(pszNext) && pszNext)
194	{
195	for (PCUSBSUFF pSuff = paSuffs; pSuff->szSuff[0]; pSuff++)
196	{
197	if ( !strncmp(pSuff->szSuff, pszNext, pSuff->cchSuff)
198	&& (!pszNext[pSuff->cchSuff] \|\| RT_C_IS_SPACE(pszNext[pSuff->cchSuff])))
199	{
200	if (pSuff->uDiv)
201	u32 /= pSuff->uDiv;
202	else
203	u32 *= pSuff->uMul;
204	break;
205	}
206	}
207	}
208	}
209	else
210	{
211	int rc = usbReadSkipSuffix(&pszNext);
212	if (RT_FAILURE(rc))
213	return rc;
214	}
215
216	*ppszNext = pszNext;
217
218	/*
219	* Set the value.
220	*/
221	switch (u32Mask)
222	{
223	case 0xff: (uint8_t )pvNum = (uint8_t)u32; break;
224	case 0xffff: (uint16_t )pvNum = (uint16_t)u32; break;
225	case 0xffffffff: (uint32_t )pvNum = (uint32_t)u32; break;
226	}
227	}
228	return VINF_SUCCESS;
229	}
230
231
232	static int usbRead8(const char pszValue, unsigned uBase, uint8_t pu8, char **ppszNext)
233	{
234	return usbReadNum(pszValue, uBase, 0xff, NULL, pu8, ppszNext);
235	}
236
237
238	static int usbRead16(const char pszValue, unsigned uBase, uint16_t pu16, char **ppszNext)
239	{
240	return usbReadNum(pszValue, uBase, 0xffff, NULL, pu16, ppszNext);
241	}
242
243
244	#if 0
245	static int usbRead16Suff(const char pszValue, unsigned uBase, PCUSBSUFF paSuffs, uint16_t pu16, char **ppszNext)
246	{
247	return usbReadNum(pszValue, uBase, 0xffff, paSuffs, pu16, ppszNext);
248	}
249	#endif
250
251
252	/**
253	* Reads a USB BCD number returning the number and the position of the next character to parse.
254	* The returned number contains the integer part in the high byte and the decimal part in the low byte.
255	*/
256	static int usbReadBCD(const char pszValue, unsigned uBase, uint16_t pu16, char **ppszNext)
257	{
258	/*
259	* Initialize return value to zero and strip leading spaces.
260	*/
261	*pu16 = 0;
262	pszValue = RTStrStripL(pszValue);
263	if (*pszValue)
264	{
265	/*
266	* Try convert the number.
267	*/
268	/* integer part */
269	char *pszNext;
270	uint32_t u32Int = 0;
271	RTStrToUInt32Ex(pszValue, &pszNext, uBase, &u32Int);
272	if (pszNext == pszValue)
273	{
274	AssertMsgFailed(("pszValue=%s\n", pszValue));
275	return VERR_NO_DATA;
276	}
277	if (u32Int & ~0xff)
278	{
279	AssertMsgFailed(("pszValue=%s u32Int=%#x (int)\n", pszValue, u32Int));
280	return VERR_OUT_OF_RANGE;
281	}
282
283	/* skip dot and read decimal part */
284	if (*pszNext != '.')
285	{
286	AssertMsgFailed(("pszValue=%s pszNext=%s (int)\n", pszValue, pszNext));
287	return VERR_PARSE_ERROR;
288	}
289	char *pszValue2 = RTStrStripL(pszNext + 1);
290	uint32_t u32Dec = 0;
291	RTStrToUInt32Ex(pszValue2, &pszNext, uBase, &u32Dec);
292	if (pszNext == pszValue)
293	{
294	AssertMsgFailed(("pszValue=%s\n", pszValue));
295	return VERR_NO_DATA;
296	}
297	if (u32Dec & ~0xff)
298	{
299	AssertMsgFailed(("pszValue=%s u32Dec=%#x\n", pszValue, u32Dec));
300	return VERR_OUT_OF_RANGE;
301	}
302
303	/*
304	* Validate and skip stuff following the number.
305	*/
306	int rc = usbReadSkipSuffix(&pszNext);
307	if (RT_FAILURE(rc))
308	return rc;
309	*ppszNext = pszNext;
310
311	/*
312	* Set the value.
313	*/
314	*pu16 = (uint16_t)u32Int << 8 \| (uint16_t)u32Dec;
315	}
316	return VINF_SUCCESS;
317	}
318
319
320	/**
321	* Reads a string, i.e. allocates memory and copies it.
322	*
323	* We assume that a string is Utf8 and if that's not the case
324	* (pre-2.6.32-kernels used Latin-1, but so few devices return non-ASCII that
325	* this usually goes unnoticed) then we mercilessly force it to be so.
326	*/
327	static int usbReadStr(const char pszValue, const char *ppsz)
328	{
329	char *psz;
330
331	if (*ppsz)
332	RTStrFree((char )ppsz);
333	psz = RTStrDup(pszValue);
334	if (psz)
335	{
336	RTStrPurgeEncoding(psz);
337	*ppsz = psz;
338	return VINF_SUCCESS;
339	}
340	return VERR_NO_MEMORY;
341	}
342
343
344	/**
345	* Skips the current property.
346	*/
347	static char usbReadSkip(char pszValue)
348	{
349	char *psz = strchr(pszValue, '=');
350	if (psz)
351	psz = strchr(psz + 1, '=');
352	if (!psz)
353	return strchr(pszValue, '\0');
354	while (psz > pszValue && !RT_C_IS_SPACE(psz[-1]))
355	psz--;
356	Assert(psz > pszValue);
357	return psz;
358	}
359
360
361	/**
362	* Determine the USB speed.
363	*/
364	static int usbReadSpeed(const char pszValue, USBDEVICESPEED pSpd, char **ppszNext)
365	{
366	pszValue = RTStrStripL(pszValue);
367	/* verified with Linux 2.4.0 ... Linux 2.6.25 */
368	if (!strncmp(pszValue, "1.5", 3))
369	*pSpd = USBDEVICESPEED_LOW;
370	else if (!strncmp(pszValue, "12 ", 3))
371	*pSpd = USBDEVICESPEED_FULL;
372	else if (!strncmp(pszValue, "480", 3))
373	*pSpd = USBDEVICESPEED_HIGH;
374	else
375	*pSpd = USBDEVICESPEED_UNKNOWN;
376	while (pszValue[0] != '\0' && !RT_C_IS_SPACE(pszValue[0]))
377	pszValue++;
378	ppszNext = (char )pszValue;
379	return VINF_SUCCESS;
380	}
381
382
383	/**
384	* Compare a prefix and returns pointer to the char following it if it matches.
385	*/
386	static char usbPrefix(char psz, const char *pszPref, size_t cchPref)
387	{
388	if (strncmp(psz, pszPref, cchPref))
389	return NULL;
390	return psz + cchPref;
391	}
392
393
394	/**
395	* Does some extra checks to improve the detected device state.
396	*
397	* We cannot distinguish between USED_BY_HOST_CAPTURABLE and
398	* USED_BY_GUEST, HELD_BY_PROXY all that well and it shouldn't be
399	* necessary either.
400	*
401	* We will however, distinguish between the device we have permissions
402	* to open and those we don't. This is necessary for two reasons.
403	*
404	* Firstly, because it's futile to even attempt opening a device which we
405	* don't have access to, it only serves to confuse the user. (That said,
406	* it might also be a bit confusing for the user to see that a USB device
407	* is grayed out with no further explanation, and no way of generating an
408	* error hinting at why this is the case.)
409	*
410	* Secondly and more importantly, we're racing against udevd with respect
411	* to permissions and group settings on newly plugged devices. When we
412	* detect a new device that we cannot access we will poll on it for a few
413	* seconds to give udevd time to fix it. The polling is actually triggered
414	* in the 'new device' case in the compare loop.
415	*
416	* The USBDEVICESTATE_USED_BY_HOST state is only used for this no-access
417	* case, while USBDEVICESTATE_UNSUPPORTED is only used in the 'hub' case.
418	* When it's neither of these, we set USBDEVICESTATE_UNUSED or
419	* USBDEVICESTATE_USED_BY_HOST_CAPTURABLE depending on whether there is
420	* a driver associated with any of the interfaces.
421	*
422	* All except the access check and a special idVendor == 0 precaution
423	* is handled at parse time.
424	*
425	* @returns The adjusted state.
426	* @param pDevice The device.
427	*/
428	static USBDEVICESTATE usbDeterminState(PCUSBDEVICE pDevice)
429	{
430	/*
431	* If it's already flagged as unsupported, there is nothing to do.
432	*/
433	USBDEVICESTATE enmState = pDevice->enmState;
434	if (enmState == USBDEVICESTATE_UNSUPPORTED)
435	return USBDEVICESTATE_UNSUPPORTED;
436
437	/*
438	* Root hubs and similar doesn't have any vendor id, just
439	* refuse these device.
440	*/
441	if (!pDevice->idVendor)
442	return USBDEVICESTATE_UNSUPPORTED;
443
444	/*
445	* Check if we've got access to the device, if we haven't flag
446	* it as used-by-host.
447	*/
448	#ifndef VBOX_USB_WITH_SYSFS
449	const char *pszAddress = pDevice->pszAddress;
450	#else
451	if (pDevice->pszAddress == NULL)
452	/* We can't do much with the device without an address. */
453	return USBDEVICESTATE_UNSUPPORTED;
454	const char *pszAddress = strstr(pDevice->pszAddress, "//device:");
455	pszAddress = pszAddress != NULL
456	? pszAddress + sizeof("//device:") - 1
457	: pDevice->pszAddress;
458	#endif
459	if ( access(pszAddress, R_OK \| W_OK) != 0
460	&& errno == EACCES)
461	return USBDEVICESTATE_USED_BY_HOST;
462
463	#ifdef VBOX_USB_WITH_SYSFS
464	/**
465	* @todo Check that any other essential fields are present and mark as
466	* invalid if not. Particularly to catch the case where the device was
467	* unplugged while we were reading in its properties.
468	*/
469	#endif
470
471	return enmState;
472	}
473
474
475	/** Just a worker for USBProxyServiceLinux::getDevices that avoids some code duplication. */
476	static int addDeviceToChain(PUSBDEVICE pDev, PUSBDEVICE ppFirst, PUSBDEVICE pppNext, const char pcszUsbfsRoot, bool testfs, int rc)
477	{
478	/* usbDeterminState requires the address. */
479	PUSBDEVICE pDevNew = (PUSBDEVICE)RTMemDup(pDev, sizeof(*pDev));
480	if (pDevNew)
481	{
482	RTStrAPrintf((char **)&pDevNew->pszAddress, "%s/%03d/%03d", pcszUsbfsRoot, pDevNew->bBus, pDevNew->bDevNum);
483	if (pDevNew->pszAddress)
484	{
485	pDevNew->enmState = usbDeterminState(pDevNew);
486	if (pDevNew->enmState != USBDEVICESTATE_UNSUPPORTED \|\| testfs)
487	{
488	if (*pppNext)
489	**pppNext = pDevNew;
490	else
491	*ppFirst = pDevNew;
492	*pppNext = &pDevNew->pNext;
493	}
494	else
495	deviceFree(pDevNew);
496	}
497	else
498	{
499	deviceFree(pDevNew);
500	rc = VERR_NO_MEMORY;
501	}
502	}
503	else
504	{
505	rc = VERR_NO_MEMORY;
506	deviceFreeMembers(pDev);
507	}
508
509	return rc;
510	}
511
512
513	static int openDevicesFile(const char pcszUsbfsRoot, FILE *ppFile)
514	{
515	char *pszPath;
516	FILE *pFile;
517	RTStrAPrintf(&pszPath, "%s/devices", pcszUsbfsRoot);
518	if (!pszPath)
519	return VERR_NO_MEMORY;
520	pFile = fopen(pszPath, "r");
521	RTStrFree(pszPath);
522	if (!pFile)
523	return RTErrConvertFromErrno(errno);
524	*ppFile = pFile;
525	return VINF_SUCCESS;
526	}
527
528	/**
529	* USBProxyService::getDevices() implementation for usbfs. The @a testfs flag
530	* tells the function to return information about unsupported devices as well.
531	* This is used as a sanity test to check that a devices file is really what
532	* we expect.
533	*/
534	static PUSBDEVICE getDevicesFromUsbfs(const char *pcszUsbfsRoot, bool testfs)
535	{
536	PUSBDEVICE pFirst = NULL;
537	FILE *pFile = NULL;
538	int rc;
539	rc = openDevicesFile(pcszUsbfsRoot, &pFile);
540	if (RT_SUCCESS(rc))
541	{
542	PUSBDEVICE *ppNext = NULL;
543	int cHits = 0;
544	char szLine[1024];
545	USBDEVICE Dev;
546	RT_ZERO(Dev);
547	Dev.enmState = USBDEVICESTATE_UNUSED;
548
549	/* Set close on exit and hope no one is racing us. */
550	rc = fcntl(fileno(pFile), F_SETFD, FD_CLOEXEC) >= 0
551	? VINF_SUCCESS
552	: RTErrConvertFromErrno(errno);
553	while ( RT_SUCCESS(rc)
554	&& fgets(szLine, sizeof(szLine), pFile))
555	{
556	char *psz;
557	char *pszValue;
558
559	/* validate and remove the trailing newline. */
560	psz = strchr(szLine, '\0');
561	if (psz[-1] != '\n' && !feof(pFile))
562	{
563	AssertMsgFailed(("Line too long. (cch=%d)\n", strlen(szLine)));
564	continue;
565	}
566
567	/* strip */
568	psz = RTStrStrip(szLine);
569	if (!*psz)
570	continue;
571
572	/*
573	* Interpret the line.
574	* (Ordered by normal occurrence.)
575	*/
576	char ch = psz[0];
577	if (psz[1] != ':')
578	continue;
579	psz = RTStrStripL(psz + 3);
580	#define PREFIX(str) ( (pszValue = usbPrefix(psz, str, sizeof(str) - 1)) != NULL )
581	switch (ch)
582	{
583	/*
584	* T: Bus=dd Lev=dd Prnt=dd Port=dd Cnt=dd Dev#=ddd Spd=ddd MxCh=dd
585	* \| \| \| \| \| \| \| \| \|__MaxChildren
586	* \| \| \| \| \| \| \| \|__Device Speed in Mbps
587	* \| \| \| \| \| \| \|__DeviceNumber
588	* \| \| \| \| \| \|__Count of devices at this level
589	* \| \| \| \| \|__Connector/Port on Parent for this device
590	* \| \| \| \|__Parent DeviceNumber
591	* \| \| \|__Level in topology for this bus
592	* \| \|__Bus number
593	* \|__Topology info tag
594	*/
595	case 'T':
596	/* add */
597	AssertMsg(cHits >= 3 \|\| cHits == 0, ("cHits=%d\n", cHits));
598	if (cHits >= 3)
599	rc = addDeviceToChain(&Dev, &pFirst, &ppNext, pcszUsbfsRoot, testfs, rc);
600	else
601	deviceFreeMembers(&Dev);
602
603	/* Reset device state */
604	memset(&Dev, 0, sizeof (Dev));
605	Dev.enmState = USBDEVICESTATE_UNUSED;
606	cHits = 1;
607
608	/* parse the line. */
609	while (*psz && RT_SUCCESS(rc))
610	{
611	if (PREFIX("Bus="))
612	rc = usbRead8(pszValue, 10, &Dev.bBus, &psz);
613	else if (PREFIX("Port="))
614	rc = usbRead8(pszValue, 10, &Dev.bPort, &psz);
615	else if (PREFIX("Spd="))
616	rc = usbReadSpeed(pszValue, &Dev.enmSpeed, &psz);
617	else if (PREFIX("Dev#="))
618	rc = usbRead8(pszValue, 10, &Dev.bDevNum, &psz);
619	else
620	psz = usbReadSkip(psz);
621	psz = RTStrStripL(psz);
622	}
623	break;
624
625	/*
626	* Bandwidth info:
627	* B: Alloc=ddd/ddd us (xx%), #Int=ddd, #Iso=ddd
628	* \| \| \| \|__Number of isochronous requests
629	* \| \| \|__Number of interrupt requests
630	* \| \|__Total Bandwidth allocated to this bus
631	* \|__Bandwidth info tag
632	*/
633	case 'B':
634	break;
635
636	/*
637	* D: Ver=x.xx Cls=xx(sssss) Sub=xx Prot=xx MxPS=dd #Cfgs=dd
638	* \| \| \| \| \| \| \|__NumberConfigurations
639	* \| \| \| \| \| \|__MaxPacketSize of Default Endpoint
640	* \| \| \| \| \|__DeviceProtocol
641	* \| \| \| \|__DeviceSubClass
642	* \| \| \|__DeviceClass
643	* \| \|__Device USB version
644	* \|__Device info tag #1
645	*/
646	case 'D':
647	while (*psz && RT_SUCCESS(rc))
648	{
649	if (PREFIX("Ver="))
650	rc = usbReadBCD(pszValue, 16, &Dev.bcdUSB, &psz);
651	else if (PREFIX("Cls="))
652	{
653	rc = usbRead8(pszValue, 16, &Dev.bDeviceClass, &psz);
654	if (RT_SUCCESS(rc) && Dev.bDeviceClass == 9 /* HUB */)
655	Dev.enmState = USBDEVICESTATE_UNSUPPORTED;
656	}
657	else if (PREFIX("Sub="))
658	rc = usbRead8(pszValue, 16, &Dev.bDeviceSubClass, &psz);
659	else if (PREFIX("Prot="))
660	rc = usbRead8(pszValue, 16, &Dev.bDeviceProtocol, &psz);
661	//else if (PREFIX("MxPS="))
662	// rc = usbRead16(pszValue, 10, &Dev.wMaxPacketSize, &psz);
663	else if (PREFIX("#Cfgs="))
664	rc = usbRead8(pszValue, 10, &Dev.bNumConfigurations, &psz);
665	else
666	psz = usbReadSkip(psz);
667	psz = RTStrStripL(psz);
668	}
669	cHits++;
670	break;
671
672	/*
673	* P: Vendor=xxxx ProdID=xxxx Rev=xx.xx
674	* \| \| \| \|__Product revision number
675	* \| \| \|__Product ID code
676	* \| \|__Vendor ID code
677	* \|__Device info tag #2
678	*/
679	case 'P':
680	while (*psz && RT_SUCCESS(rc))
681	{
682	if (PREFIX("Vendor="))
683	rc = usbRead16(pszValue, 16, &Dev.idVendor, &psz);
684	else if (PREFIX("ProdID="))
685	rc = usbRead16(pszValue, 16, &Dev.idProduct, &psz);
686	else if (PREFIX("Rev="))
687	rc = usbReadBCD(pszValue, 16, &Dev.bcdDevice, &psz);
688	else
689	psz = usbReadSkip(psz);
690	psz = RTStrStripL(psz);
691	}
692	cHits++;
693	break;
694
695	/*
696	* String.
697	*/
698	case 'S':
699	if (PREFIX("Manufacturer="))
700	rc = usbReadStr(pszValue, &Dev.pszManufacturer);
701	else if (PREFIX("Product="))
702	rc = usbReadStr(pszValue, &Dev.pszProduct);
703	else if (PREFIX("SerialNumber="))
704	{
705	rc = usbReadStr(pszValue, &Dev.pszSerialNumber);
706	if (RT_SUCCESS(rc))
707	Dev.u64SerialHash = USBLibHashSerial(pszValue);
708	}
709	break;
710
711	/*
712	* C:* #Ifs=dd Cfg#=dd Atr=xx MPwr=dddmA
713	* \| \| \| \| \| \|__MaxPower in mA
714	* \| \| \| \| \|__Attributes
715	* \| \| \| \|__ConfiguratioNumber
716	* \| \| \|__NumberOfInterfaces
717	* \| \|__ "*" indicates the active configuration (others are " ")
718	* \|__Config info tag
719	*/
720	case 'C':
721	break;
722
723	/*
724	* I: If#=dd Alt=dd #EPs=dd Cls=xx(sssss) Sub=xx Prot=xx Driver=ssss
725	* \| \| \| \| \| \| \| \|__Driver name
726	* \| \| \| \| \| \| \| or "(none)"
727	* \| \| \| \| \| \| \|__InterfaceProtocol
728	* \| \| \| \| \| \|__InterfaceSubClass
729	* \| \| \| \| \|__InterfaceClass
730	* \| \| \| \|__NumberOfEndpoints
731	* \| \| \|__AlternateSettingNumber
732	* \| \|__InterfaceNumber
733	* \|__Interface info tag
734	*/
735	case 'I':
736	{
737	/* Check for thing we don't support. */
738	while (*psz && RT_SUCCESS(rc))
739	{
740	if (PREFIX("Driver="))
741	{
742	const char *pszDriver = NULL;
743	rc = usbReadStr(pszValue, &pszDriver);
744	if ( !pszDriver
745	\|\| !*pszDriver
746	\|\| !strcmp(pszDriver, "(none)")
747	\|\| !strcmp(pszDriver, "(no driver)"))
748	/* no driver */;
749	else if (!strcmp(pszDriver, "hub"))
750	Dev.enmState = USBDEVICESTATE_UNSUPPORTED;
751	else if (Dev.enmState == USBDEVICESTATE_UNUSED)
752	Dev.enmState = USBDEVICESTATE_USED_BY_HOST_CAPTURABLE;
753	RTStrFree((char *)pszDriver);
754	break; /* last attrib */
755	}
756	else if (PREFIX("Cls="))
757	{
758	uint8_t bInterfaceClass;
759	rc = usbRead8(pszValue, 16, &bInterfaceClass, &psz);
760	if (RT_SUCCESS(rc) && bInterfaceClass == 9 /* HUB */)
761	Dev.enmState = USBDEVICESTATE_UNSUPPORTED;
762	}
763	else
764	psz = usbReadSkip(psz);
765	psz = RTStrStripL(psz);
766	}
767	break;
768	}
769
770
771	/*
772	* E: Ad=xx(s) Atr=xx(ssss) MxPS=dddd Ivl=dddms
773	* \| \| \| \| \|__Interval (max) between transfers
774	* \| \| \| \|__EndpointMaxPacketSize
775	* \| \| \|__Attributes(EndpointType)
776	* \| \|__EndpointAddress(I=In,O=Out)
777	* \|__Endpoint info tag
778	*/
779	case 'E':
780	break;
781
782	}
783	#undef PREFIX
784	} /* parse loop */
785	fclose(pFile);
786
787	/*
788	* Add the current entry.
789	*/
790	AssertMsg(cHits >= 3 \|\| cHits == 0, ("cHits=%d\n", cHits));
791	if (cHits >= 3)
792	rc = addDeviceToChain(&Dev, &pFirst, &ppNext, pcszUsbfsRoot, testfs, rc);
793
794	/*
795	* Success?
796	*/
797	if (RT_FAILURE(rc))
798	{
799	while (pFirst)
800	{
801	PUSBDEVICE pFree = pFirst;
802	pFirst = pFirst->pNext;
803	deviceFree(pFree);
804	}
805	}
806	}
807	if (RT_FAILURE(rc))
808	LogFlow(("USBProxyServiceLinux::getDevices: rc=%Rrc\n", rc));
809	return pFirst;
810	}
811
812	#ifdef VBOX_USB_WITH_SYSFS
813
814	static void USBDevInfoCleanup(USBDeviceInfo *pSelf)
815	{
816	RTStrFree(pSelf->mDevice);
817	RTStrFree(pSelf->mSysfsPath);
818	pSelf->mDevice = pSelf->mSysfsPath = NULL;
819	VEC_CLEANUP_PTR(&pSelf->mvecpszInterfaces);
820	}
821
822	static int USBDevInfoInit(USBDeviceInfo pSelf, const char aDevice,
823	const char *aSystemID)
824	{
825	pSelf->mDevice = aDevice ? RTStrDup(aDevice) : NULL;
826	pSelf->mSysfsPath = aSystemID ? RTStrDup(aSystemID) : NULL;
827	VEC_INIT_PTR(&pSelf->mvecpszInterfaces, char *, RTStrFree);
828	if ((aDevice && !pSelf->mDevice) \|\| (aSystemID && ! pSelf->mSysfsPath))
829	{
830	USBDevInfoCleanup(pSelf);
831	return 0;
832	}
833	return 1;
834	}
835
836	#define USBDEVICE_MAJOR 189
837
838	/** Deduce the bus that a USB device is plugged into from the device node
839	* number. See drivers/usb/core/hub.c:usb_new_device as of Linux 2.6.20. */
840	static unsigned usbBusFromDevNum(dev_t devNum)
841	{
842	AssertReturn(devNum, 0);
843	AssertReturn(major(devNum) == USBDEVICE_MAJOR, 0);
844	return (minor(devNum) >> 7) + 1;
845	}
846
847
848	/** Deduce the device number of a USB device on the bus from the device node
849	* number. See drivers/usb/core/hub.c:usb_new_device as of Linux 2.6.20. */
850	static unsigned usbDeviceFromDevNum(dev_t devNum)
851	{
852	AssertReturn(devNum, 0);
853	AssertReturn(major(devNum) == USBDEVICE_MAJOR, 0);
854	return (minor(devNum) & 127) + 1;
855	}
856
857
858	/**
859	* If a file @a pcszNode from /sys/bus/usb/devices is a device rather than an
860	* interface add an element for the device to @a pvecDevInfo.
861	*/
862	static int addIfDevice(const char *pcszDevicesRoot,
863	const char *pcszNode,
864	VECTOR_OBJ(USBDeviceInfo) *pvecDevInfo)
865	{
866	const char *pcszFile = strrchr(pcszNode, '/');
867	if (strchr(pcszFile, ':'))
868	return VINF_SUCCESS;
869	dev_t devnum = RTLinuxSysFsReadDevNumFile("%s/dev", pcszNode);
870	/* Sanity test of our static helpers */
871	Assert(usbBusFromDevNum(makedev(USBDEVICE_MAJOR, 517)) == 5);
872	Assert(usbDeviceFromDevNum(makedev(USBDEVICE_MAJOR, 517)) == 6);
873	if (!devnum)
874	return VINF_SUCCESS;
875	char szDevPath[RTPATH_MAX];
876	ssize_t cchDevPath;
877	cchDevPath = RTLinuxFindDevicePath(devnum, RTFS_TYPE_DEV_CHAR,
878	szDevPath, sizeof(szDevPath),
879	"%s/%.3d/%.3d",
880	pcszDevicesRoot,
881	usbBusFromDevNum(devnum),
882	usbDeviceFromDevNum(devnum));
883	if (cchDevPath < 0)
884	return VINF_SUCCESS;
885
886	USBDeviceInfo info;
887	if (USBDevInfoInit(&info, szDevPath, pcszNode))
888	if (RT_SUCCESS(VEC_PUSH_BACK_OBJ(pvecDevInfo, USBDeviceInfo,
889	&info)))
890	return VINF_SUCCESS;
891	USBDevInfoCleanup(&info);
892	return VERR_NO_MEMORY;
893	}
894
895	/** The logic for testing whether a sysfs address corresponds to an
896	* interface of a device. Both must be referenced by their canonical
897	* sysfs paths. This is not tested, as the test requires file-system
898	* interaction. */
899	static bool muiIsAnInterfaceOf(const char pcszIface, const char pcszDev)
900	{
901	size_t cchDev = strlen(pcszDev);
902
903	AssertPtr(pcszIface);
904	AssertPtr(pcszDev);
905	Assert(pcszIface[0] == '/');
906	Assert(pcszDev[0] == '/');
907	Assert(pcszDev[cchDev - 1] != '/');
908	/* If this passes, pcszIface is at least cchDev long */
909	if (strncmp(pcszIface, pcszDev, cchDev))
910	return false;
911	/* If this passes, pcszIface is longer than cchDev */
912	if (pcszIface[cchDev] != '/')
913	return false;
914	/* In sysfs an interface is an immediate subdirectory of the device */
915	if (strchr(pcszIface + cchDev + 1, '/'))
916	return false;
917	/* And it always has a colon in its name */
918	if (!strchr(pcszIface + cchDev + 1, ':'))
919	return false;
920	/* And hopefully we have now elimitated everything else */
921	return true;
922	}
923
924	#ifdef DEBUG
925	# ifdef __cplusplus
926	/** Unit test the logic in muiIsAnInterfaceOf in debug builds. */
927	class testIsAnInterfaceOf
928	{
929	public:
930	testIsAnInterfaceOf()
931	{
932	Assert(muiIsAnInterfaceOf("/sys/devices/pci0000:00/0000:00:1a.0/usb3/3-0:1.0",
933	"/sys/devices/pci0000:00/0000:00:1a.0/usb3"));
934	Assert(!muiIsAnInterfaceOf("/sys/devices/pci0000:00/0000:00:1a.0/usb3/3-1",
935	"/sys/devices/pci0000:00/0000:00:1a.0/usb3"));
936	Assert(!muiIsAnInterfaceOf("/sys/devices/pci0000:00/0000:00:1a.0/usb3/3-0:1.0/driver",
937	"/sys/devices/pci0000:00/0000:00:1a.0/usb3"));
938	}
939	};
940	static testIsAnInterfaceOf testIsAnInterfaceOfInst;
941	# endif /* __cplusplus */
942	#endif /* DEBUG */
943
944	/**
945	* Tell whether a file in /sys/bus/usb/devices is an interface rather than a
946	* device. To be used with getDeviceInfoFromSysfs().
947	*/
948	static int addIfInterfaceOf(const char pcszNode, USBDeviceInfo pInfo)
949	{
950	if (!muiIsAnInterfaceOf(pcszNode, pInfo->mSysfsPath))
951	return VINF_SUCCESS;
952	char pszDup = (char )RTStrDup(pcszNode);
953	if (pszDup)
954	if (RT_SUCCESS(VEC_PUSH_BACK_PTR(&pInfo->mvecpszInterfaces,
955	char *, pszDup)))
956	return VINF_SUCCESS;
957	RTStrFree(pszDup);
958	return VERR_NO_MEMORY;
959	}
960
961	/** Helper for readFilePaths(). Adds the entries from the open directory
962	* @a pDir to the vector @a pvecpchDevs using either the full path or the
963	* realpath() and skipping hidden files and files on which realpath() fails. */
964	static int readFilePathsFromDir(const char pcszPath, DIR pDir,
965	VECTOR_PTR(char ) pvecpchDevs)
966	{
967	struct dirent entry, *pResult;
968	int err, rc;
969
970	for (err = readdir_r(pDir, &entry, &pResult); pResult;
971	err = readdir_r(pDir, &entry, &pResult))
972	{
973	char szPath[RTPATH_MAX + 1], szRealPath[RTPATH_MAX + 1], *pszPath;
974	if (entry.d_name[0] == '.')
975	continue;
976	if (snprintf(szPath, sizeof(szPath), "%s/%s", pcszPath,
977	entry.d_name) < 0)
978	return RTErrConvertFromErrno(errno);
979	pszPath = RTStrDup(realpath(szPath, szRealPath));
980	if (!pszPath)
981	return VERR_NO_MEMORY;
982	if (RT_FAILURE(rc = VEC_PUSH_BACK_PTR(pvecpchDevs, char *, pszPath)))
983	return rc;
984	}
985	return RTErrConvertFromErrno(err);
986	}
987
988	/**
989	* Dump the names of a directory's entries into a vector of char pointers.
990	*
991	* @returns zero on success or (positive) posix error value.
992	* @param pcszPath the path to dump.
993	* @param pvecpchDevs an empty vector of char pointers - must be cleaned up
994	* by the caller even on failure.
995	* @param withRealPath whether to canonicalise the filename with realpath
996	*/
997	static int readFilePaths(const char pcszPath, VECTOR_PTR(char ) *pvecpchDevs)
998	{
999	DIR *pDir;
1000	int rc;
1001
1002	AssertPtrReturn(pvecpchDevs, EINVAL);
1003	AssertReturn(VEC_SIZE_PTR(pvecpchDevs) == 0, EINVAL);
1004	AssertPtrReturn(pcszPath, EINVAL);
1005
1006	pDir = opendir(pcszPath);
1007	if (!pDir)
1008	return RTErrConvertFromErrno(errno);
1009	rc = readFilePathsFromDir(pcszPath, pDir, pvecpchDevs);
1010	if (closedir(pDir) < 0 && RT_SUCCESS(rc))
1011	rc = RTErrConvertFromErrno(errno);
1012	return rc;
1013	}
1014
1015	/**
1016	* Logic for USBSysfsEnumerateHostDevices.
1017	* @param pvecDevInfo vector of device information structures to add device
1018	* information to
1019	* @param pvecpchDevs empty scratch vector which will be freed by the caller,
1020	* to simplify exit logic
1021	*/
1022	static int doSysfsEnumerateHostDevices(const char *pcszDevicesRoot,
1023	VECTOR_OBJ(USBDeviceInfo) *pvecDevInfo,
1024	VECTOR_PTR(char ) pvecpchDevs)
1025	{
1026	char **ppszEntry;
1027	USBDeviceInfo *pInfo;
1028	int rc;
1029
1030	AssertPtrReturn(pvecDevInfo, VERR_INVALID_POINTER);
1031	LogFlowFunc (("pvecDevInfo=%p\n", pvecDevInfo));
1032
1033	rc = readFilePaths("/sys/bus/usb/devices", pvecpchDevs);
1034	if (RT_FAILURE(rc))
1035	return rc;
1036	VEC_FOR_EACH(pvecpchDevs, char *, ppszEntry)
1037	if (RT_FAILURE(rc = addIfDevice(pcszDevicesRoot, *ppszEntry,
1038	pvecDevInfo)))
1039	return rc;
1040	VEC_FOR_EACH(pvecDevInfo, USBDeviceInfo, pInfo)
1041	VEC_FOR_EACH(pvecpchDevs, char *, ppszEntry)
1042	if (RT_FAILURE(rc = addIfInterfaceOf(*ppszEntry, pInfo)))
1043	return rc;
1044	return VINF_SUCCESS;
1045	}
1046
1047	static int USBSysfsEnumerateHostDevices(const char *pcszDevicesRoot,
1048	VECTOR_OBJ(USBDeviceInfo) *pvecDevInfo)
1049	{
1050	VECTOR_PTR(char *) vecpchDevs;
1051	int rc = VERR_NOT_IMPLEMENTED;
1052
1053	AssertReturn(VEC_SIZE_OBJ(pvecDevInfo) == 0, VERR_INVALID_PARAMETER);
1054	LogFlowFunc(("entered\n"));
1055	VEC_INIT_PTR(&vecpchDevs, char *, RTStrFree);
1056	rc = doSysfsEnumerateHostDevices(pcszDevicesRoot, pvecDevInfo,
1057	&vecpchDevs);
1058	VEC_CLEANUP_PTR(&vecpchDevs);
1059	LogFlowFunc(("rc=%Rrc\n", rc));
1060	return rc;
1061	}
1062
1063	/**
1064	* Helper function for extracting the port number on the parent device from
1065	* the sysfs path value.
1066	*
1067	* The sysfs path is a chain of elements separated by forward slashes, and for
1068	* USB devices, the last element in the chain takes the form
1069	* <port>-<port>.[...].<port>[:<config>.<interface>]
1070	* where the first <port> is the port number on the root hub, and the following
1071	* (optional) ones are the port numbers on any other hubs between the device
1072	* and the root hub. The last part (:<config.interface>) is only present for
1073	* interfaces, not for devices. This API should only be called for devices.
1074	* For compatibility with usbfs, which enumerates from zero up, we subtract one
1075	* from the port number.
1076	*
1077	* For root hubs, the last element in the chain takes the form
1078	* usb<hub number>
1079	* and usbfs always returns port number zero.
1080	*
1081	* @returns VBox status. pu8Port is set on success.
1082	* @param pszPath The sysfs path to parse.
1083	* @param pu8Port Where to store the port number.
1084	*/
1085	static int usbGetPortFromSysfsPath(const char pszPath, uint8_t pu8Port)
1086	{
1087	AssertPtrReturn(pszPath, VERR_INVALID_POINTER);
1088	AssertPtrReturn(pu8Port, VERR_INVALID_POINTER);
1089
1090	/*
1091	* This should not be possible until we get PCs with USB as their primary bus.
1092	* Note: We don't assert this, as we don't expect the caller to validate the
1093	* sysfs path.
1094	*/
1095	const char *pszLastComp = strrchr(pszPath, '/');
1096	if (!pszLastComp)
1097	{
1098	Log(("usbGetPortFromSysfsPath(%s): failed [1]\n", pszPath));
1099	return VERR_INVALID_PARAMETER;
1100	}
1101	pszLastComp++; /* skip the slash */
1102
1103	/*
1104	* This API should not be called for interfaces, so the last component
1105	* of the path should not contain a colon. We do assert this, as it
1106	* might indicate a caller bug.
1107	*/
1108	AssertMsgReturn(strchr(pszLastComp, ':') == NULL, ("%s\n", pszPath), VERR_INVALID_PARAMETER);
1109
1110	/*
1111	* Look for the start of the last number.
1112	*/
1113	const char *pchDash = strrchr(pszLastComp, '-');
1114	const char *pchDot = strrchr(pszLastComp, '.');
1115	if (!pchDash && !pchDot)
1116	{
1117	/* No -/. so it must be a root hub. Check that it's usb<something>. */
1118	if (strncmp(pszLastComp, "usb", sizeof("usb") - 1) != 0)
1119	{
1120	Log(("usbGetPortFromSysfsPath(%s): failed [2]\n", pszPath));
1121	return VERR_INVALID_PARAMETER;
1122	}
1123	return VERR_NOT_SUPPORTED;
1124	}
1125	else
1126	{
1127	const char *pszLastPort = pchDot != NULL
1128	? pchDot + 1
1129	: pchDash + 1;
1130	int rc = RTStrToUInt8Full(pszLastPort, 10, pu8Port);
1131	if (rc != VINF_SUCCESS)
1132	{
1133	Log(("usbGetPortFromSysfsPath(%s): failed [3], rc=%Rrc\n", pszPath, rc));
1134	return VERR_INVALID_PARAMETER;
1135	}
1136	if (*pu8Port == 0)
1137	{
1138	Log(("usbGetPortFromSysfsPath(%s): failed [4]\n", pszPath));
1139	return VERR_INVALID_PARAMETER;
1140	}
1141
1142	/* usbfs compatibility, 0-based port number. */
1143	*pu8Port -= 1;
1144	}
1145	return VINF_SUCCESS;
1146	}
1147
1148
1149	/**
1150	* Dumps a USBDEVICE structure to the log using LogLevel 3.
1151	* @param pDev The structure to log.
1152	* @todo This is really common code.
1153	*/
1154	DECLINLINE(void) usbLogDevice(PUSBDEVICE pDev)
1155	{
1156	NOREF(pDev);
1157
1158	Log3(("USB device:\n"));
1159	Log3(("Product: %s (%x)\n", pDev->pszProduct, pDev->idProduct));
1160	Log3(("Manufacturer: %s (Vendor ID %x)\n", pDev->pszManufacturer, pDev->idVendor));
1161	Log3(("Serial number: %s (%llx)\n", pDev->pszSerialNumber, pDev->u64SerialHash));
1162	Log3(("Device revision: %d\n", pDev->bcdDevice));
1163	Log3(("Device class: %x\n", pDev->bDeviceClass));
1164	Log3(("Device subclass: %x\n", pDev->bDeviceSubClass));
1165	Log3(("Device protocol: %x\n", pDev->bDeviceProtocol));
1166	Log3(("USB version number: %d\n", pDev->bcdUSB));
1167	Log3(("Device speed: %s\n",
1168	pDev->enmSpeed == USBDEVICESPEED_UNKNOWN ? "unknown"
1169	: pDev->enmSpeed == USBDEVICESPEED_LOW ? "1.5 MBit/s"
1170	: pDev->enmSpeed == USBDEVICESPEED_FULL ? "12 MBit/s"
1171	: pDev->enmSpeed == USBDEVICESPEED_HIGH ? "480 MBit/s"
1172	: pDev->enmSpeed == USBDEVICESPEED_VARIABLE ? "variable"
1173	: "invalid"));
1174	Log3(("Number of configurations: %d\n", pDev->bNumConfigurations));
1175	Log3(("Bus number: %d\n", pDev->bBus));
1176	Log3(("Port number: %d\n", pDev->bPort));
1177	Log3(("Device number: %d\n", pDev->bDevNum));
1178	Log3(("Device state: %s\n",
1179	pDev->enmState == USBDEVICESTATE_UNSUPPORTED ? "unsupported"
1180	: pDev->enmState == USBDEVICESTATE_USED_BY_HOST ? "in use by host"
1181	: pDev->enmState == USBDEVICESTATE_USED_BY_HOST_CAPTURABLE ? "in use by host, possibly capturable"
1182	: pDev->enmState == USBDEVICESTATE_UNUSED ? "not in use"
1183	: pDev->enmState == USBDEVICESTATE_HELD_BY_PROXY ? "held by proxy"
1184	: pDev->enmState == USBDEVICESTATE_USED_BY_GUEST ? "used by guest"
1185	: "invalid"));
1186	Log3(("OS device address: %s\n", pDev->pszAddress));
1187	}
1188
1189	/**
1190	* In contrast to usbReadBCD() this function can handle BCD values without
1191	* a decimal separator. This is necessary for parsing bcdDevice.
1192	* @param pszBuf Pointer to the string buffer.
1193	* @param pu15 Pointer to the return value.
1194	* @returns IPRT status code.
1195	*/
1196	static int convertSysfsStrToBCD(const char pszBuf, uint16_t pu16)
1197	{
1198	char *pszNext;
1199	int32_t i32;
1200
1201	pszBuf = RTStrStripL(pszBuf);
1202	int rc = RTStrToInt32Ex(pszBuf, &pszNext, 16, &i32);
1203	if ( RT_FAILURE(rc)
1204	\|\| rc == VWRN_NUMBER_TOO_BIG
1205	\|\| i32 < 0)
1206	return VERR_NUMBER_TOO_BIG;
1207	if (*pszNext == '.')
1208	{
1209	if (i32 > 255)
1210	return VERR_NUMBER_TOO_BIG;
1211	int32_t i32Lo;
1212	rc = RTStrToInt32Ex(pszNext+1, &pszNext, 16, &i32Lo);
1213	if ( RT_FAILURE(rc)
1214	\|\| rc == VWRN_NUMBER_TOO_BIG
1215	\|\| i32Lo > 255
1216	\|\| i32Lo < 0)
1217	return VERR_NUMBER_TOO_BIG;
1218	i32 = (i32 << 8) \| i32Lo;
1219	}
1220	if ( i32 > 65535
1221	\|\| (pszNext != '\0' && pszNext != ' '))
1222	return VERR_NUMBER_TOO_BIG;
1223
1224	*pu16 = (uint16_t)i32;
1225	return VINF_SUCCESS;
1226	}
1227
1228	#endif /* VBOX_USB_WITH_SYSFS */
1229
1230	static void fillInDeviceFromSysfs(USBDEVICE Dev, USBDeviceInfo pInfo)
1231	{
1232	int rc;
1233	const char *pszSysfsPath = pInfo->mSysfsPath;
1234
1235	/* Fill in the simple fields */
1236	Dev->enmState = USBDEVICESTATE_UNUSED;
1237	Dev->bBus = RTLinuxSysFsReadIntFile(10, "%s/busnum", pszSysfsPath);
1238	Dev->bDeviceClass = RTLinuxSysFsReadIntFile(16, "%s/bDeviceClass", pszSysfsPath);
1239	Dev->bDeviceSubClass = RTLinuxSysFsReadIntFile(16, "%s/bDeviceSubClass", pszSysfsPath);
1240	Dev->bDeviceProtocol = RTLinuxSysFsReadIntFile(16, "%s/bDeviceProtocol", pszSysfsPath);
1241	Dev->bNumConfigurations = RTLinuxSysFsReadIntFile(10, "%s/bNumConfigurations", pszSysfsPath);
1242	Dev->idVendor = RTLinuxSysFsReadIntFile(16, "%s/idVendor", pszSysfsPath);
1243	Dev->idProduct = RTLinuxSysFsReadIntFile(16, "%s/idProduct", pszSysfsPath);
1244	Dev->bDevNum = RTLinuxSysFsReadIntFile(10, "%s/devnum", pszSysfsPath);
1245
1246	/* Now deal with the non-numeric bits. */
1247	char szBuf[1024]; /* Should be larger than anything a sane device
1248	* will need, and insane devices can be unsupported
1249	* until further notice. */
1250	ssize_t cchRead;
1251
1252	/* For simplicity, we just do strcmps on the next one. */
1253	cchRead = RTLinuxSysFsReadStrFile(szBuf, sizeof(szBuf), "%s/speed",
1254	pszSysfsPath);
1255	if (cchRead <= 0 \|\| (size_t) cchRead == sizeof(szBuf))
1256	Dev->enmState = USBDEVICESTATE_UNSUPPORTED;
1257	else
1258	Dev->enmSpeed = !strcmp(szBuf, "1.5") ? USBDEVICESPEED_LOW
1259	: !strcmp(szBuf, "12") ? USBDEVICESPEED_FULL
1260	: !strcmp(szBuf, "480") ? USBDEVICESPEED_HIGH
1261	: USBDEVICESPEED_UNKNOWN;
1262
1263	cchRead = RTLinuxSysFsReadStrFile(szBuf, sizeof(szBuf), "%s/version",
1264	pszSysfsPath);
1265	if (cchRead <= 0 \|\| (size_t) cchRead == sizeof(szBuf))
1266	Dev->enmState = USBDEVICESTATE_UNSUPPORTED;
1267	else
1268	{
1269	rc = convertSysfsStrToBCD(szBuf, &Dev->bcdUSB);
1270	if (RT_FAILURE(rc))
1271	{
1272	Dev->enmState = USBDEVICESTATE_UNSUPPORTED;
1273	Dev->bcdUSB = (uint16_t)-1;
1274	}
1275	}
1276
1277	cchRead = RTLinuxSysFsReadStrFile(szBuf, sizeof(szBuf), "%s/bcdDevice",
1278	pszSysfsPath);
1279	if (cchRead <= 0 \|\| (size_t) cchRead == sizeof(szBuf))
1280	Dev->bcdDevice = (uint16_t)-1;
1281	else
1282	{
1283	rc = convertSysfsStrToBCD(szBuf, &Dev->bcdDevice);
1284	if (RT_FAILURE(rc))
1285	Dev->bcdDevice = (uint16_t)-1;
1286	}
1287
1288	/* Now do things that need string duplication */
1289	cchRead = RTLinuxSysFsReadStrFile(szBuf, sizeof(szBuf), "%s/product",
1290	pszSysfsPath);
1291	if (cchRead > 0 && (size_t) cchRead < sizeof(szBuf))
1292	{
1293	RTStrPurgeEncoding(szBuf);
1294	Dev->pszProduct = RTStrDup(szBuf);
1295	}
1296
1297	cchRead = RTLinuxSysFsReadStrFile(szBuf, sizeof(szBuf), "%s/serial",
1298	pszSysfsPath);
1299	if (cchRead > 0 && (size_t) cchRead < sizeof(szBuf))
1300	{
1301	RTStrPurgeEncoding(szBuf);
1302	Dev->pszSerialNumber = RTStrDup(szBuf);
1303	Dev->u64SerialHash = USBLibHashSerial(szBuf);
1304	}
1305
1306	cchRead = RTLinuxSysFsReadStrFile(szBuf, sizeof(szBuf), "%s/manufacturer",
1307	pszSysfsPath);
1308	if (cchRead > 0 && (size_t) cchRead < sizeof(szBuf))
1309	{
1310	RTStrPurgeEncoding(szBuf);
1311	Dev->pszManufacturer = RTStrDup(szBuf);
1312	}
1313
1314	/* Work out the port number */
1315	if (RT_FAILURE(usbGetPortFromSysfsPath(pszSysfsPath, &Dev->bPort)))
1316	Dev->enmState = USBDEVICESTATE_UNSUPPORTED;
1317
1318	/* Check the interfaces to see if we can support the device. */
1319	char **ppszIf;
1320	VEC_FOR_EACH(&pInfo->mvecpszInterfaces, char *, ppszIf)
1321	{
1322	ssize_t cb = RTLinuxSysFsGetLinkDest(szBuf, sizeof(szBuf), "%s/driver",
1323	*ppszIf);
1324	if (cb > 0 && Dev->enmState != USBDEVICESTATE_UNSUPPORTED)
1325	Dev->enmState = (strcmp(szBuf, "hub") == 0)
1326	? USBDEVICESTATE_UNSUPPORTED
1327	: USBDEVICESTATE_USED_BY_HOST_CAPTURABLE;
1328	if (RTLinuxSysFsReadIntFile(16, "%s/bInterfaceClass",
1329	ppszIf) == 9 / hub */)
1330	Dev->enmState = USBDEVICESTATE_UNSUPPORTED;
1331	}
1332
1333	/* We use a double slash as a separator in the pszAddress field. This is
1334	* alright as the two paths can't contain a slash due to the way we build
1335	* them. */
1336	char *pszAddress = NULL;
1337	RTStrAPrintf(&pszAddress, "sysfs:%s//device:%s", pszSysfsPath,
1338	pInfo->mDevice);
1339	Dev->pszAddress = pszAddress;
1340
1341	/* Work out from the data collected whether we can support this device. */
1342	Dev->enmState = usbDeterminState(Dev);
1343	usbLogDevice(Dev);
1344	}
1345
1346	/**
1347	* USBProxyService::getDevices() implementation for sysfs.
1348	*/
1349	static PUSBDEVICE getDevicesFromSysfs(const char *pcszDevicesRoot, bool testfs)
1350	{
1351	#ifdef VBOX_USB_WITH_SYSFS
1352	/* Add each of the devices found to the chain. */
1353	PUSBDEVICE pFirst = NULL;
1354	PUSBDEVICE pLast = NULL;
1355	VECTOR_OBJ(USBDeviceInfo) vecDevInfo;
1356	USBDeviceInfo *pInfo;
1357	int rc;
1358
1359	VEC_INIT_OBJ(&vecDevInfo, USBDeviceInfo, USBDevInfoCleanup);
1360	rc = USBSysfsEnumerateHostDevices(pcszDevicesRoot, &vecDevInfo);
1361	if (RT_FAILURE(rc))
1362	return NULL;
1363	VEC_FOR_EACH(&vecDevInfo, USBDeviceInfo, pInfo)
1364	{
1365	USBDEVICE Dev = (USBDEVICE )RTMemAllocZ(sizeof(USBDEVICE));
1366	if (!Dev)
1367	rc = VERR_NO_MEMORY;
1368	if (RT_SUCCESS(rc))
1369	{
1370	fillInDeviceFromSysfs(Dev, pInfo);
1371	}
1372	if ( RT_SUCCESS(rc)
1373	&& ( Dev->enmState != USBDEVICESTATE_UNSUPPORTED
1374	\|\| testfs)
1375	&& Dev->pszAddress != NULL
1376	)
1377	{
1378	if (pLast != NULL)
1379	{
1380	pLast->pNext = Dev;
1381	pLast = pLast->pNext;
1382	}
1383	else
1384	pFirst = pLast = Dev;
1385	}
1386	else
1387	deviceFree(Dev);
1388	if (RT_FAILURE(rc))
1389	break;
1390	}
1391	if (RT_FAILURE(rc))
1392	deviceListFree(&pFirst);
1393
1394	VEC_CLEANUP_OBJ(&vecDevInfo);
1395	return pFirst;
1396	#else /* !VBOX_USB_WITH_SYSFS */
1397	return NULL;
1398	#endif /* !VBOX_USB_WITH_SYSFS */
1399	}
1400
1401	/** Is inotify available and working on this system? This is a requirement
1402	* for using USB with sysfs */
1403	/** @todo test the "inotify in glibc but not in the kernel" case. */
1404	static bool inotifyAvailable(void)
1405	{
1406	int (*inotify_init)(void);
1407
1408	(void *)(&inotify_init) = dlsym(RTLD_DEFAULT, "inotify_init");
1409	if (!inotify_init)
1410	return false;
1411	int fd = inotify_init();
1412	if (fd == -1)
1413	return false;
1414	close(fd);
1415	return true;
1416	}
1417
1418	PCUSBDEVTREELOCATION USBProxyLinuxGetDeviceRoot(bool fPreferSysfs)
1419	{
1420	PCUSBDEVTREELOCATION pcBestUsbfs = NULL;
1421	PCUSBDEVTREELOCATION pcBestSysfs = NULL;
1422
1423	bool fHaveInotify = inotifyAvailable();
1424	for (unsigned i = 0; i < RT_ELEMENTS(s_aTreeLocations); ++i)
1425	if (!s_aTreeLocations[i].fUseSysfs)
1426	{
1427	if (!pcBestUsbfs)
1428	{
1429	PUSBDEVICE pDevices;
1430
1431	pDevices = getDevicesFromUsbfs(s_aTreeLocations[i].szDevicesRoot,
1432	true);
1433	if (pDevices)
1434	{
1435	pcBestUsbfs = &s_aTreeLocations[i];
1436	deviceListFree(&pDevices);
1437	}
1438	}
1439	}
1440	else
1441	{
1442	if ( fHaveInotify
1443	&& !pcBestSysfs
1444	&& RTPathExists(s_aTreeLocations[i].szDevicesRoot))
1445	{
1446	PUSBDEVICE pDevices;
1447
1448	pDevices = getDevicesFromSysfs(s_aTreeLocations[i].szDevicesRoot,
1449	true);
1450	if (pDevices)
1451	{
1452	pcBestSysfs = &s_aTreeLocations[i];
1453	deviceListFree(&pDevices);
1454	}
1455	}
1456	}
1457	if (pcBestUsbfs && !fPreferSysfs)
1458	return pcBestUsbfs;
1459	return pcBestSysfs;
1460	}
1461
1462
1463	PUSBDEVICE USBProxyLinuxGetDevices(const char *pcszDevicesRoot,
1464	bool fUseSysfs)
1465	{
1466	if (!fUseSysfs)
1467	return getDevicesFromUsbfs(pcszDevicesRoot, false);
1468	else
1469	return getDevicesFromSysfs(pcszDevicesRoot, false);
1470	}

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source: vbox/trunk/src/VBox/Main/linux/USBGetDevices.cpp@ 34941

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