USBGetDevices.cpp@ 37390

Last change on this file since 37390 was 37390, checked in by vboxsync, 14 years ago
Main/USB/linux: attempt to fix USB detection on CentOS/RHEL 5, added assertion
Property svn:eol-style set to `native` Property svn:keywords set to `Author Date Id Revision`
File size: 52.0 KB

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1	/* $Id: USBGetDevices.cpp 37390 2011-06-08 16:22:59Z 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.215389.xyz. 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	/**
99	* "reads" the number suffix. It's more like validating it and
100	* skipping the necessary number of chars.
101	*/
102	static int usbReadSkipSuffix(char **ppszNext)
103	{
104	char pszNext = ppszNext;
105	if (!RT_C_IS_SPACE(pszNext) && pszNext)
106	{
107	/* skip unit */
108	if (pszNext[0] == 'm' && pszNext[1] == 's')
109	pszNext += 2;
110	else if (pszNext[0] == 'm' && pszNext[1] == 'A')
111	pszNext += 2;
112
113	/* skip parenthesis */
114	if (*pszNext == '(')
115	{
116	pszNext = strchr(pszNext, ')');
117	if (!pszNext++)
118	{
119	AssertMsgFailed(("ppszNext=%s\n", ppszNext));
120	return VERR_PARSE_ERROR;
121	}
122	}
123
124	/* blank or end of the line. */
125	if (!RT_C_IS_SPACE(pszNext) && pszNext)
126	{
127	AssertMsgFailed(("pszNext=%s\n", pszNext));
128	return VERR_PARSE_ERROR;
129	}
130
131	/* it's ok. */
132	*ppszNext = pszNext;
133	}
134
135	return VINF_SUCCESS;
136	}
137
138
139	/**
140	* Reads a USB number returning the number and the position of the next character to parse.
141	*/
142	static int usbReadNum(const char pszValue, unsigned uBase, uint32_t u32Mask, PCUSBSUFF paSuffs, void pvNum, char **ppszNext)
143	{
144	/*
145	* Initialize return value to zero and strip leading spaces.
146	*/
147	switch (u32Mask)
148	{
149	case 0xff: (uint8_t )pvNum = 0; break;
150	case 0xffff: (uint16_t )pvNum = 0; break;
151	case 0xffffffff: (uint32_t )pvNum = 0; break;
152	}
153	pszValue = RTStrStripL(pszValue);
154	if (*pszValue)
155	{
156	/*
157	* Try convert the number.
158	*/
159	char *pszNext;
160	uint32_t u32 = 0;
161	RTStrToUInt32Ex(pszValue, &pszNext, uBase, &u32);
162	if (pszNext == pszValue)
163	{
164	AssertMsgFailed(("pszValue=%d\n", pszValue));
165	return VERR_NO_DATA;
166	}
167
168	/*
169	* Check the range.
170	*/
171	if (u32 & ~u32Mask)
172	{
173	AssertMsgFailed(("pszValue=%d u32=%#x lMask=%#x\n", pszValue, u32, u32Mask));
174	return VERR_OUT_OF_RANGE;
175	}
176
177	/*
178	* Validate and skip stuff following the number.
179	*/
180	if (paSuffs)
181	{
182	if (!RT_C_IS_SPACE(pszNext) && pszNext)
183	{
184	for (PCUSBSUFF pSuff = paSuffs; pSuff->szSuff[0]; pSuff++)
185	{
186	if ( !strncmp(pSuff->szSuff, pszNext, pSuff->cchSuff)
187	&& (!pszNext[pSuff->cchSuff] \|\| RT_C_IS_SPACE(pszNext[pSuff->cchSuff])))
188	{
189	if (pSuff->uDiv)
190	u32 /= pSuff->uDiv;
191	else
192	u32 *= pSuff->uMul;
193	break;
194	}
195	}
196	}
197	}
198	else
199	{
200	int rc = usbReadSkipSuffix(&pszNext);
201	if (RT_FAILURE(rc))
202	return rc;
203	}
204
205	*ppszNext = pszNext;
206
207	/*
208	* Set the value.
209	*/
210	switch (u32Mask)
211	{
212	case 0xff: (uint8_t )pvNum = (uint8_t)u32; break;
213	case 0xffff: (uint16_t )pvNum = (uint16_t)u32; break;
214	case 0xffffffff: (uint32_t )pvNum = (uint32_t)u32; break;
215	}
216	}
217	return VINF_SUCCESS;
218	}
219
220
221	static int usbRead8(const char pszValue, unsigned uBase, uint8_t pu8, char **ppszNext)
222	{
223	return usbReadNum(pszValue, uBase, 0xff, NULL, pu8, ppszNext);
224	}
225
226
227	static int usbRead16(const char pszValue, unsigned uBase, uint16_t pu16, char **ppszNext)
228	{
229	return usbReadNum(pszValue, uBase, 0xffff, NULL, pu16, ppszNext);
230	}
231
232
233	#if 0
234	static int usbRead16Suff(const char pszValue, unsigned uBase, PCUSBSUFF paSuffs, uint16_t pu16, char **ppszNext)
235	{
236	return usbReadNum(pszValue, uBase, 0xffff, paSuffs, pu16, ppszNext);
237	}
238	#endif
239
240
241	/**
242	* Reads a USB BCD number returning the number and the position of the next character to parse.
243	* The returned number contains the integer part in the high byte and the decimal part in the low byte.
244	*/
245	static int usbReadBCD(const char pszValue, unsigned uBase, uint16_t pu16, char **ppszNext)
246	{
247	/*
248	* Initialize return value to zero and strip leading spaces.
249	*/
250	*pu16 = 0;
251	pszValue = RTStrStripL(pszValue);
252	if (*pszValue)
253	{
254	/*
255	* Try convert the number.
256	*/
257	/* integer part */
258	char *pszNext;
259	uint32_t u32Int = 0;
260	RTStrToUInt32Ex(pszValue, &pszNext, uBase, &u32Int);
261	if (pszNext == pszValue)
262	{
263	AssertMsgFailed(("pszValue=%s\n", pszValue));
264	return VERR_NO_DATA;
265	}
266	if (u32Int & ~0xff)
267	{
268	AssertMsgFailed(("pszValue=%s u32Int=%#x (int)\n", pszValue, u32Int));
269	return VERR_OUT_OF_RANGE;
270	}
271
272	/* skip dot and read decimal part */
273	if (*pszNext != '.')
274	{
275	AssertMsgFailed(("pszValue=%s pszNext=%s (int)\n", pszValue, pszNext));
276	return VERR_PARSE_ERROR;
277	}
278	char *pszValue2 = RTStrStripL(pszNext + 1);
279	uint32_t u32Dec = 0;
280	RTStrToUInt32Ex(pszValue2, &pszNext, uBase, &u32Dec);
281	if (pszNext == pszValue)
282	{
283	AssertMsgFailed(("pszValue=%s\n", pszValue));
284	return VERR_NO_DATA;
285	}
286	if (u32Dec & ~0xff)
287	{
288	AssertMsgFailed(("pszValue=%s u32Dec=%#x\n", pszValue, u32Dec));
289	return VERR_OUT_OF_RANGE;
290	}
291
292	/*
293	* Validate and skip stuff following the number.
294	*/
295	int rc = usbReadSkipSuffix(&pszNext);
296	if (RT_FAILURE(rc))
297	return rc;
298	*ppszNext = pszNext;
299
300	/*
301	* Set the value.
302	*/
303	*pu16 = (uint16_t)u32Int << 8 \| (uint16_t)u32Dec;
304	}
305	return VINF_SUCCESS;
306	}
307
308
309	/**
310	* Reads a string, i.e. allocates memory and copies it.
311	*
312	* We assume that a string is Utf8 and if that's not the case
313	* (pre-2.6.32-kernels used Latin-1, but so few devices return non-ASCII that
314	* this usually goes unnoticed) then we mercilessly force it to be so.
315	*/
316	static int usbReadStr(const char pszValue, const char *ppsz)
317	{
318	char *psz;
319
320	if (*ppsz)
321	RTStrFree((char )ppsz);
322	psz = RTStrDup(pszValue);
323	if (psz)
324	{
325	RTStrPurgeEncoding(psz);
326	*ppsz = psz;
327	return VINF_SUCCESS;
328	}
329	return VERR_NO_MEMORY;
330	}
331
332
333	/**
334	* Skips the current property.
335	*/
336	static char usbReadSkip(char pszValue)
337	{
338	char *psz = strchr(pszValue, '=');
339	if (psz)
340	psz = strchr(psz + 1, '=');
341	if (!psz)
342	return strchr(pszValue, '\0');
343	while (psz > pszValue && !RT_C_IS_SPACE(psz[-1]))
344	psz--;
345	Assert(psz > pszValue);
346	return psz;
347	}
348
349
350	/**
351	* Determine the USB speed.
352	*/
353	static int usbReadSpeed(const char pszValue, USBDEVICESPEED pSpd, char **ppszNext)
354	{
355	pszValue = RTStrStripL(pszValue);
356	/* verified with Linux 2.4.0 ... Linux 2.6.25 */
357	if (!strncmp(pszValue, "1.5", 3))
358	*pSpd = USBDEVICESPEED_LOW;
359	else if (!strncmp(pszValue, "12 ", 3))
360	*pSpd = USBDEVICESPEED_FULL;
361	else if (!strncmp(pszValue, "480", 3))
362	*pSpd = USBDEVICESPEED_HIGH;
363	else
364	*pSpd = USBDEVICESPEED_UNKNOWN;
365	while (pszValue[0] != '\0' && !RT_C_IS_SPACE(pszValue[0]))
366	pszValue++;
367	ppszNext = (char )pszValue;
368	return VINF_SUCCESS;
369	}
370
371
372	/**
373	* Compare a prefix and returns pointer to the char following it if it matches.
374	*/
375	static char usbPrefix(char psz, const char *pszPref, size_t cchPref)
376	{
377	if (strncmp(psz, pszPref, cchPref))
378	return NULL;
379	return psz + cchPref;
380	}
381
382
383	/**
384	* Does some extra checks to improve the detected device state.
385	*
386	* We cannot distinguish between USED_BY_HOST_CAPTURABLE and
387	* USED_BY_GUEST, HELD_BY_PROXY all that well and it shouldn't be
388	* necessary either.
389	*
390	* We will however, distinguish between the device we have permissions
391	* to open and those we don't. This is necessary for two reasons.
392	*
393	* Firstly, because it's futile to even attempt opening a device which we
394	* don't have access to, it only serves to confuse the user. (That said,
395	* it might also be a bit confusing for the user to see that a USB device
396	* is grayed out with no further explanation, and no way of generating an
397	* error hinting at why this is the case.)
398	*
399	* Secondly and more importantly, we're racing against udevd with respect
400	* to permissions and group settings on newly plugged devices. When we
401	* detect a new device that we cannot access we will poll on it for a few
402	* seconds to give udevd time to fix it. The polling is actually triggered
403	* in the 'new device' case in the compare loop.
404	*
405	* The USBDEVICESTATE_USED_BY_HOST state is only used for this no-access
406	* case, while USBDEVICESTATE_UNSUPPORTED is only used in the 'hub' case.
407	* When it's neither of these, we set USBDEVICESTATE_UNUSED or
408	* USBDEVICESTATE_USED_BY_HOST_CAPTURABLE depending on whether there is
409	* a driver associated with any of the interfaces.
410	*
411	* All except the access check and a special idVendor == 0 precaution
412	* is handled at parse time.
413	*
414	* @returns The adjusted state.
415	* @param pDevice The device.
416	*/
417	static USBDEVICESTATE usbDeterminState(PCUSBDEVICE pDevice)
418	{
419	/*
420	* If it's already flagged as unsupported, there is nothing to do.
421	*/
422	USBDEVICESTATE enmState = pDevice->enmState;
423	if (enmState == USBDEVICESTATE_UNSUPPORTED)
424	return USBDEVICESTATE_UNSUPPORTED;
425
426	/*
427	* Root hubs and similar doesn't have any vendor id, just
428	* refuse these device.
429	*/
430	if (!pDevice->idVendor)
431	return USBDEVICESTATE_UNSUPPORTED;
432
433	/*
434	* Check if we've got access to the device, if we haven't flag
435	* it as used-by-host.
436	*/
437	#ifndef VBOX_USB_WITH_SYSFS
438	const char *pszAddress = pDevice->pszAddress;
439	#else
440	if (pDevice->pszAddress == NULL)
441	/* We can't do much with the device without an address. */
442	return USBDEVICESTATE_UNSUPPORTED;
443	const char *pszAddress = strstr(pDevice->pszAddress, "//device:");
444	pszAddress = pszAddress != NULL
445	? pszAddress + sizeof("//device:") - 1
446	: pDevice->pszAddress;
447	#endif
448	if ( access(pszAddress, R_OK \| W_OK) != 0
449	&& errno == EACCES)
450	return USBDEVICESTATE_USED_BY_HOST;
451
452	#ifdef VBOX_USB_WITH_SYSFS
453	/**
454	* @todo Check that any other essential fields are present and mark as
455	* invalid if not. Particularly to catch the case where the device was
456	* unplugged while we were reading in its properties.
457	*/
458	#endif
459
460	return enmState;
461	}
462
463
464	/** Just a worker for USBProxyServiceLinux::getDevices that avoids some code duplication. */
465	static int addDeviceToChain(PUSBDEVICE pDev, PUSBDEVICE ppFirst, PUSBDEVICE pppNext, const char pcszUsbfsRoot, bool testfs, int rc)
466	{
467	/* usbDeterminState requires the address. */
468	PUSBDEVICE pDevNew = (PUSBDEVICE)RTMemDup(pDev, sizeof(*pDev));
469	if (pDevNew)
470	{
471	RTStrAPrintf((char **)&pDevNew->pszAddress, "%s/%03d/%03d", pcszUsbfsRoot, pDevNew->bBus, pDevNew->bDevNum);
472	if (pDevNew->pszAddress)
473	{
474	pDevNew->enmState = usbDeterminState(pDevNew);
475	if (pDevNew->enmState != USBDEVICESTATE_UNSUPPORTED \|\| testfs)
476	{
477	if (*pppNext)
478	**pppNext = pDevNew;
479	else
480	*ppFirst = pDevNew;
481	*pppNext = &pDevNew->pNext;
482	}
483	else
484	deviceFree(pDevNew);
485	}
486	else
487	{
488	deviceFree(pDevNew);
489	rc = VERR_NO_MEMORY;
490	}
491	}
492	else
493	{
494	rc = VERR_NO_MEMORY;
495	deviceFreeMembers(pDev);
496	}
497
498	return rc;
499	}
500
501
502	static int openDevicesFile(const char pcszUsbfsRoot, FILE *ppFile)
503	{
504	char *pszPath;
505	FILE *pFile;
506	RTStrAPrintf(&pszPath, "%s/devices", pcszUsbfsRoot);
507	if (!pszPath)
508	return VERR_NO_MEMORY;
509	pFile = fopen(pszPath, "r");
510	RTStrFree(pszPath);
511	if (!pFile)
512	return RTErrConvertFromErrno(errno);
513	*ppFile = pFile;
514	return VINF_SUCCESS;
515	}
516
517	/**
518	* USBProxyService::getDevices() implementation for usbfs. The @a testfs flag
519	* tells the function to return information about unsupported devices as well.
520	* This is used as a sanity test to check that a devices file is really what
521	* we expect.
522	*/
523	static PUSBDEVICE getDevicesFromUsbfs(const char *pcszUsbfsRoot, bool testfs)
524	{
525	PUSBDEVICE pFirst = NULL;
526	FILE *pFile = NULL;
527	int rc;
528	rc = openDevicesFile(pcszUsbfsRoot, &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 = usbPrefix(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 = addDeviceToChain(&Dev, &pFirst, &ppNext, pcszUsbfsRoot, testfs, rc);
589	else
590	deviceFreeMembers(&Dev);
591
592	/* Reset device state */
593	memset(&Dev, 0, sizeof (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 = usbRead8(pszValue, 10, &Dev.bBus, &psz);
602	else if (PREFIX("Port="))
603	rc = usbRead8(pszValue, 10, &Dev.bPort, &psz);
604	else if (PREFIX("Spd="))
605	rc = usbReadSpeed(pszValue, &Dev.enmSpeed, &psz);
606	else if (PREFIX("Dev#="))
607	rc = usbRead8(pszValue, 10, &Dev.bDevNum, &psz);
608	else
609	psz = usbReadSkip(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 = usbReadBCD(pszValue, 16, &Dev.bcdUSB, &psz);
640	else if (PREFIX("Cls="))
641	{
642	rc = usbRead8(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 = usbRead8(pszValue, 16, &Dev.bDeviceSubClass, &psz);
648	else if (PREFIX("Prot="))
649	rc = usbRead8(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 = usbRead8(pszValue, 10, &Dev.bNumConfigurations, &psz);
654	else
655	psz = usbReadSkip(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 = usbRead16(pszValue, 16, &Dev.idVendor, &psz);
673	else if (PREFIX("ProdID="))
674	rc = usbRead16(pszValue, 16, &Dev.idProduct, &psz);
675	else if (PREFIX("Rev="))
676	rc = usbReadBCD(pszValue, 16, &Dev.bcdDevice, &psz);
677	else
678	psz = usbReadSkip(psz);
679	psz = RTStrStripL(psz);
680	}
681	cHits++;
682	break;
683
684	/*
685	* String.
686	*/
687	case 'S':
688	if (PREFIX("Manufacturer="))
689	rc = usbReadStr(pszValue, &Dev.pszManufacturer);
690	else if (PREFIX("Product="))
691	rc = usbReadStr(pszValue, &Dev.pszProduct);
692	else if (PREFIX("SerialNumber="))
693	{
694	rc = usbReadStr(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 = usbReadStr(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 = usbRead8(pszValue, 16, &bInterfaceClass, &psz);
749	if (RT_SUCCESS(rc) && bInterfaceClass == 9 /* HUB */)
750	Dev.enmState = USBDEVICESTATE_UNSUPPORTED;
751	}
752	else
753	psz = usbReadSkip(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 = addDeviceToChain(&Dev, &pFirst, &ppNext, pcszUsbfsRoot, testfs, 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	#ifdef VBOX_USB_WITH_SYSFS
802
803	static void USBDevInfoCleanup(USBDeviceInfo *pSelf)
804	{
805	RTStrFree(pSelf->mDevice);
806	RTStrFree(pSelf->mSysfsPath);
807	pSelf->mDevice = pSelf->mSysfsPath = NULL;
808	VEC_CLEANUP_PTR(&pSelf->mvecpszInterfaces);
809	}
810
811	static int USBDevInfoInit(USBDeviceInfo pSelf, const char aDevice,
812	const char *aSystemID)
813	{
814	pSelf->mDevice = aDevice ? RTStrDup(aDevice) : NULL;
815	pSelf->mSysfsPath = aSystemID ? RTStrDup(aSystemID) : NULL;
816	VEC_INIT_PTR(&pSelf->mvecpszInterfaces, char *, RTStrFree);
817	if ((aDevice && !pSelf->mDevice) \|\| (aSystemID && ! pSelf->mSysfsPath))
818	{
819	USBDevInfoCleanup(pSelf);
820	return 0;
821	}
822	return 1;
823	}
824
825	#define USBDEVICE_MAJOR 189
826
827	/** Calculate the bus (a.k.a root hub) number of a USB device from it's sysfs
828	* path. sysfs nodes representing root hubs have file names of the form
829	* usb<n>, where n is the bus number; other devices start with that number.
830	* See [http://www.linux-usb.org/FAQ.html#i6] and
831	* [http://www.kernel.org/doc/Documentation/usb/proc_usb_info.txt] for
832	* equivalent information about usbfs.
833	* @returns a bus number greater than 0 on success or 0 on failure.
834	*/
835	static unsigned usbGetBusFromSysfsPath(const char *pcszPath)
836	{
837	const char *pcszFile = strrchr(pcszPath, '/');
838	if (!pcszFile)
839	return 0;
840	unsigned bus = RTStrToUInt32(pcszFile + 1);
841	if ( !bus
842	&& pcszFile[1] == 'u' && pcszFile[2] == 's' && pcszFile[3] == 'b')
843	bus = RTStrToUInt32(pcszFile + 4);
844	return bus;
845	}
846
847	/** Calculate the device number of a USB device. See
848	* drivers/usb/core/hub.c:usb_new_device as of Linux 2.6.20. */
849	static dev_t usbMakeDevNum(unsigned bus, unsigned device)
850	{
851	AssertReturn(bus > 0, 0);
852	AssertReturn(((device - 1) & ~127) == 0, 0);
853	AssertReturn(device > 0, 0);
854	return makedev(USBDEVICE_MAJOR, ((bus - 1) << 7) + device - 1);
855	}
856
857	/**
858	* If a file @a pcszNode from /sys/bus/usb/devices is a device rather than an
859	* interface add an element for the device to @a pvecDevInfo.
860	*/
861	static int addIfDevice(const char *pcszDevicesRoot,
862	const char *pcszNode,
863	VECTOR_OBJ(USBDeviceInfo) *pvecDevInfo)
864	{
865	const char *pcszFile = strrchr(pcszNode, '/');
866	if (!pcszFile)
867	return VERR_INVALID_PARAMETER;
868	if (strchr(pcszFile, ':'))
869	return VINF_SUCCESS;
870	unsigned bus = usbGetBusFromSysfsPath(pcszNode);
871	if (!bus)
872	return VINF_SUCCESS;
873	unsigned device = RTLinuxSysFsReadIntFile(10, "%s/devnum", pcszNode);
874	dev_t devnum = usbMakeDevNum(bus, device);
875	if (!devnum)
876	return VINF_SUCCESS;
877	char szDevPath[RTPATH_MAX];
878	ssize_t cchDevPath;
879	cchDevPath = RTLinuxFindDevicePath(devnum, RTFS_TYPE_DEV_CHAR,
880	szDevPath, sizeof(szDevPath),
881	"%s/%.3d/%.3d",
882	pcszDevicesRoot, bus, device);
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	if (!realpath(szPath, szRealPath))
980	return RTErrConvertFromErrno(errno);
981	pszPath = RTStrDup(szRealPath);
982	if (!pszPath)
983	return VERR_NO_MEMORY;
984	if (RT_FAILURE(rc = VEC_PUSH_BACK_PTR(pvecpchDevs, char *, pszPath)))
985	return rc;
986	}
987	return RTErrConvertFromErrno(err);
988	}
989
990	/**
991	* Dump the names of a directory's entries into a vector of char pointers.
992	*
993	* @returns zero on success or (positive) posix error value.
994	* @param pcszPath the path to dump.
995	* @param pvecpchDevs an empty vector of char pointers - must be cleaned up
996	* by the caller even on failure.
997	* @param withRealPath whether to canonicalise the filename with realpath
998	*/
999	static int readFilePaths(const char pcszPath, VECTOR_PTR(char ) *pvecpchDevs)
1000	{
1001	DIR *pDir;
1002	int rc;
1003
1004	AssertPtrReturn(pvecpchDevs, EINVAL);
1005	AssertReturn(VEC_SIZE_PTR(pvecpchDevs) == 0, EINVAL);
1006	AssertPtrReturn(pcszPath, EINVAL);
1007
1008	pDir = opendir(pcszPath);
1009	if (!pDir)
1010	return RTErrConvertFromErrno(errno);
1011	rc = readFilePathsFromDir(pcszPath, pDir, pvecpchDevs);
1012	if (closedir(pDir) < 0 && RT_SUCCESS(rc))
1013	rc = RTErrConvertFromErrno(errno);
1014	return rc;
1015	}
1016
1017	/**
1018	* Logic for USBSysfsEnumerateHostDevices.
1019	* @param pvecDevInfo vector of device information structures to add device
1020	* information to
1021	* @param pvecpchDevs empty scratch vector which will be freed by the caller,
1022	* to simplify exit logic
1023	*/
1024	static int doSysfsEnumerateHostDevices(const char *pcszDevicesRoot,
1025	VECTOR_OBJ(USBDeviceInfo) *pvecDevInfo,
1026	VECTOR_PTR(char ) pvecpchDevs)
1027	{
1028	char **ppszEntry;
1029	USBDeviceInfo *pInfo;
1030	int rc;
1031
1032	AssertPtrReturn(pvecDevInfo, VERR_INVALID_POINTER);
1033	LogFlowFunc (("pvecDevInfo=%p\n", pvecDevInfo));
1034
1035	rc = readFilePaths("/sys/bus/usb/devices", pvecpchDevs);
1036	if (RT_FAILURE(rc))
1037	return rc;
1038	VEC_FOR_EACH(pvecpchDevs, char *, ppszEntry)
1039	if (RT_FAILURE(rc = addIfDevice(pcszDevicesRoot, *ppszEntry,
1040	pvecDevInfo)))
1041	return rc;
1042	VEC_FOR_EACH(pvecDevInfo, USBDeviceInfo, pInfo)
1043	VEC_FOR_EACH(pvecpchDevs, char *, ppszEntry)
1044	if (RT_FAILURE(rc = addIfInterfaceOf(*ppszEntry, pInfo)))
1045	return rc;
1046	return VINF_SUCCESS;
1047	}
1048
1049	static int USBSysfsEnumerateHostDevices(const char *pcszDevicesRoot,
1050	VECTOR_OBJ(USBDeviceInfo) *pvecDevInfo)
1051	{
1052	VECTOR_PTR(char *) vecpchDevs;
1053	int rc = VERR_NOT_IMPLEMENTED;
1054
1055	AssertReturn(VEC_SIZE_OBJ(pvecDevInfo) == 0, VERR_INVALID_PARAMETER);
1056	LogFlowFunc(("entered\n"));
1057	VEC_INIT_PTR(&vecpchDevs, char *, RTStrFree);
1058	rc = doSysfsEnumerateHostDevices(pcszDevicesRoot, pvecDevInfo,
1059	&vecpchDevs);
1060	VEC_CLEANUP_PTR(&vecpchDevs);
1061	LogFlowFunc(("rc=%Rrc\n", rc));
1062	return rc;
1063	}
1064
1065	/**
1066	* Helper function for extracting the port number on the parent device from
1067	* the sysfs path value.
1068	*
1069	* The sysfs path is a chain of elements separated by forward slashes, and for
1070	* USB devices, the last element in the chain takes the form
1071	* <port>-<port>.[...].<port>[:<config>.<interface>]
1072	* where the first <port> is the port number on the root hub, and the following
1073	* (optional) ones are the port numbers on any other hubs between the device
1074	* and the root hub. The last part (:<config.interface>) is only present for
1075	* interfaces, not for devices. This API should only be called for devices.
1076	* For compatibility with usbfs, which enumerates from zero up, we subtract one
1077	* from the port number.
1078	*
1079	* For root hubs, the last element in the chain takes the form
1080	* usb<hub number>
1081	* and usbfs always returns port number zero.
1082	*
1083	* @returns VBox status. pu8Port is set on success.
1084	* @param pszPath The sysfs path to parse.
1085	* @param pu8Port Where to store the port number.
1086	*/
1087	static int usbGetPortFromSysfsPath(const char pszPath, uint8_t pu8Port)
1088	{
1089	AssertPtrReturn(pszPath, VERR_INVALID_POINTER);
1090	AssertPtrReturn(pu8Port, VERR_INVALID_POINTER);
1091
1092	/*
1093	* This should not be possible until we get PCs with USB as their primary bus.
1094	* Note: We don't assert this, as we don't expect the caller to validate the
1095	* sysfs path.
1096	*/
1097	const char *pszLastComp = strrchr(pszPath, '/');
1098	if (!pszLastComp)
1099	{
1100	Log(("usbGetPortFromSysfsPath(%s): failed [1]\n", pszPath));
1101	return VERR_INVALID_PARAMETER;
1102	}
1103	pszLastComp++; /* skip the slash */
1104
1105	/*
1106	* This API should not be called for interfaces, so the last component
1107	* of the path should not contain a colon. We do assert this, as it
1108	* might indicate a caller bug.
1109	*/
1110	AssertMsgReturn(strchr(pszLastComp, ':') == NULL, ("%s\n", pszPath), VERR_INVALID_PARAMETER);
1111
1112	/*
1113	* Look for the start of the last number.
1114	*/
1115	const char *pchDash = strrchr(pszLastComp, '-');
1116	const char *pchDot = strrchr(pszLastComp, '.');
1117	if (!pchDash && !pchDot)
1118	{
1119	/* No -/. so it must be a root hub. Check that it's usb<something>. */
1120	if (strncmp(pszLastComp, "usb", sizeof("usb") - 1) != 0)
1121	{
1122	Log(("usbGetPortFromSysfsPath(%s): failed [2]\n", pszPath));
1123	return VERR_INVALID_PARAMETER;
1124	}
1125	return VERR_NOT_SUPPORTED;
1126	}
1127	else
1128	{
1129	const char *pszLastPort = pchDot != NULL
1130	? pchDot + 1
1131	: pchDash + 1;
1132	int rc = RTStrToUInt8Full(pszLastPort, 10, pu8Port);
1133	if (rc != VINF_SUCCESS)
1134	{
1135	Log(("usbGetPortFromSysfsPath(%s): failed [3], rc=%Rrc\n", pszPath, rc));
1136	return VERR_INVALID_PARAMETER;
1137	}
1138	if (*pu8Port == 0)
1139	{
1140	Log(("usbGetPortFromSysfsPath(%s): failed [4]\n", pszPath));
1141	return VERR_INVALID_PARAMETER;
1142	}
1143
1144	/* usbfs compatibility, 0-based port number. */
1145	*pu8Port -= 1;
1146	}
1147	return VINF_SUCCESS;
1148	}
1149
1150
1151	/**
1152	* Dumps a USBDEVICE structure to the log using LogLevel 3.
1153	* @param pDev The structure to log.
1154	* @todo This is really common code.
1155	*/
1156	DECLINLINE(void) usbLogDevice(PUSBDEVICE pDev)
1157	{
1158	NOREF(pDev);
1159
1160	Log3(("USB device:\n"));
1161	Log3(("Product: %s (%x)\n", pDev->pszProduct, pDev->idProduct));
1162	Log3(("Manufacturer: %s (Vendor ID %x)\n", pDev->pszManufacturer, pDev->idVendor));
1163	Log3(("Serial number: %s (%llx)\n", pDev->pszSerialNumber, pDev->u64SerialHash));
1164	Log3(("Device revision: %d\n", pDev->bcdDevice));
1165	Log3(("Device class: %x\n", pDev->bDeviceClass));
1166	Log3(("Device subclass: %x\n", pDev->bDeviceSubClass));
1167	Log3(("Device protocol: %x\n", pDev->bDeviceProtocol));
1168	Log3(("USB version number: %d\n", pDev->bcdUSB));
1169	Log3(("Device speed: %s\n",
1170	pDev->enmSpeed == USBDEVICESPEED_UNKNOWN ? "unknown"
1171	: pDev->enmSpeed == USBDEVICESPEED_LOW ? "1.5 MBit/s"
1172	: pDev->enmSpeed == USBDEVICESPEED_FULL ? "12 MBit/s"
1173	: pDev->enmSpeed == USBDEVICESPEED_HIGH ? "480 MBit/s"
1174	: pDev->enmSpeed == USBDEVICESPEED_VARIABLE ? "variable"
1175	: "invalid"));
1176	Log3(("Number of configurations: %d\n", pDev->bNumConfigurations));
1177	Log3(("Bus number: %d\n", pDev->bBus));
1178	Log3(("Port number: %d\n", pDev->bPort));
1179	Log3(("Device number: %d\n", pDev->bDevNum));
1180	Log3(("Device state: %s\n",
1181	pDev->enmState == USBDEVICESTATE_UNSUPPORTED ? "unsupported"
1182	: pDev->enmState == USBDEVICESTATE_USED_BY_HOST ? "in use by host"
1183	: pDev->enmState == USBDEVICESTATE_USED_BY_HOST_CAPTURABLE ? "in use by host, possibly capturable"
1184	: pDev->enmState == USBDEVICESTATE_UNUSED ? "not in use"
1185	: pDev->enmState == USBDEVICESTATE_HELD_BY_PROXY ? "held by proxy"
1186	: pDev->enmState == USBDEVICESTATE_USED_BY_GUEST ? "used by guest"
1187	: "invalid"));
1188	Log3(("OS device address: %s\n", pDev->pszAddress));
1189	}
1190
1191	/**
1192	* In contrast to usbReadBCD() this function can handle BCD values without
1193	* a decimal separator. This is necessary for parsing bcdDevice.
1194	* @param pszBuf Pointer to the string buffer.
1195	* @param pu15 Pointer to the return value.
1196	* @returns IPRT status code.
1197	*/
1198	static int convertSysfsStrToBCD(const char pszBuf, uint16_t pu16)
1199	{
1200	char *pszNext;
1201	int32_t i32;
1202
1203	pszBuf = RTStrStripL(pszBuf);
1204	int rc = RTStrToInt32Ex(pszBuf, &pszNext, 16, &i32);
1205	if ( RT_FAILURE(rc)
1206	\|\| rc == VWRN_NUMBER_TOO_BIG
1207	\|\| i32 < 0)
1208	return VERR_NUMBER_TOO_BIG;
1209	if (*pszNext == '.')
1210	{
1211	if (i32 > 255)
1212	return VERR_NUMBER_TOO_BIG;
1213	int32_t i32Lo;
1214	rc = RTStrToInt32Ex(pszNext+1, &pszNext, 16, &i32Lo);
1215	if ( RT_FAILURE(rc)
1216	\|\| rc == VWRN_NUMBER_TOO_BIG
1217	\|\| i32Lo > 255
1218	\|\| i32Lo < 0)
1219	return VERR_NUMBER_TOO_BIG;
1220	i32 = (i32 << 8) \| i32Lo;
1221	}
1222	if ( i32 > 65535
1223	\|\| (pszNext != '\0' && pszNext != ' '))
1224	return VERR_NUMBER_TOO_BIG;
1225
1226	*pu16 = (uint16_t)i32;
1227	return VINF_SUCCESS;
1228	}
1229
1230	#endif /* VBOX_USB_WITH_SYSFS */
1231
1232	static void fillInDeviceFromSysfs(USBDEVICE Dev, USBDeviceInfo pInfo)
1233	{
1234	int rc;
1235	const char *pszSysfsPath = pInfo->mSysfsPath;
1236
1237	/* Fill in the simple fields */
1238	Dev->enmState = USBDEVICESTATE_UNUSED;
1239	Dev->bBus = usbGetBusFromSysfsPath(pszSysfsPath);
1240	Dev->bDeviceClass = RTLinuxSysFsReadIntFile(16, "%s/bDeviceClass", pszSysfsPath);
1241	Dev->bDeviceSubClass = RTLinuxSysFsReadIntFile(16, "%s/bDeviceSubClass", pszSysfsPath);
1242	Dev->bDeviceProtocol = RTLinuxSysFsReadIntFile(16, "%s/bDeviceProtocol", pszSysfsPath);
1243	Dev->bNumConfigurations = RTLinuxSysFsReadIntFile(10, "%s/bNumConfigurations", pszSysfsPath);
1244	Dev->idVendor = RTLinuxSysFsReadIntFile(16, "%s/idVendor", pszSysfsPath);
1245	Dev->idProduct = RTLinuxSysFsReadIntFile(16, "%s/idProduct", pszSysfsPath);
1246	Dev->bDevNum = RTLinuxSysFsReadIntFile(10, "%s/devnum", pszSysfsPath);
1247
1248	/* Now deal with the non-numeric bits. */
1249	char szBuf[1024]; /* Should be larger than anything a sane device
1250	* will need, and insane devices can be unsupported
1251	* until further notice. */
1252	ssize_t cchRead;
1253
1254	/* For simplicity, we just do strcmps on the next one. */
1255	cchRead = RTLinuxSysFsReadStrFile(szBuf, sizeof(szBuf), "%s/speed",
1256	pszSysfsPath);
1257	if (cchRead <= 0 \|\| (size_t) cchRead == sizeof(szBuf))
1258	Dev->enmState = USBDEVICESTATE_UNSUPPORTED;
1259	else
1260	Dev->enmSpeed = !strcmp(szBuf, "1.5") ? USBDEVICESPEED_LOW
1261	: !strcmp(szBuf, "12") ? USBDEVICESPEED_FULL
1262	: !strcmp(szBuf, "480") ? USBDEVICESPEED_HIGH
1263	: USBDEVICESPEED_UNKNOWN;
1264
1265	cchRead = RTLinuxSysFsReadStrFile(szBuf, sizeof(szBuf), "%s/version",
1266	pszSysfsPath);
1267	if (cchRead <= 0 \|\| (size_t) cchRead == sizeof(szBuf))
1268	Dev->enmState = USBDEVICESTATE_UNSUPPORTED;
1269	else
1270	{
1271	rc = convertSysfsStrToBCD(szBuf, &Dev->bcdUSB);
1272	if (RT_FAILURE(rc))
1273	{
1274	Dev->enmState = USBDEVICESTATE_UNSUPPORTED;
1275	Dev->bcdUSB = (uint16_t)-1;
1276	}
1277	}
1278
1279	cchRead = RTLinuxSysFsReadStrFile(szBuf, sizeof(szBuf), "%s/bcdDevice",
1280	pszSysfsPath);
1281	if (cchRead <= 0 \|\| (size_t) cchRead == sizeof(szBuf))
1282	Dev->bcdDevice = (uint16_t)-1;
1283	else
1284	{
1285	rc = convertSysfsStrToBCD(szBuf, &Dev->bcdDevice);
1286	if (RT_FAILURE(rc))
1287	Dev->bcdDevice = (uint16_t)-1;
1288	}
1289
1290	/* Now do things that need string duplication */
1291	cchRead = RTLinuxSysFsReadStrFile(szBuf, sizeof(szBuf), "%s/product",
1292	pszSysfsPath);
1293	if (cchRead > 0 && (size_t) cchRead < sizeof(szBuf))
1294	{
1295	RTStrPurgeEncoding(szBuf);
1296	Dev->pszProduct = RTStrDup(szBuf);
1297	}
1298
1299	cchRead = RTLinuxSysFsReadStrFile(szBuf, sizeof(szBuf), "%s/serial",
1300	pszSysfsPath);
1301	if (cchRead > 0 && (size_t) cchRead < sizeof(szBuf))
1302	{
1303	RTStrPurgeEncoding(szBuf);
1304	Dev->pszSerialNumber = RTStrDup(szBuf);
1305	Dev->u64SerialHash = USBLibHashSerial(szBuf);
1306	}
1307
1308	cchRead = RTLinuxSysFsReadStrFile(szBuf, sizeof(szBuf), "%s/manufacturer",
1309	pszSysfsPath);
1310	if (cchRead > 0 && (size_t) cchRead < sizeof(szBuf))
1311	{
1312	RTStrPurgeEncoding(szBuf);
1313	Dev->pszManufacturer = RTStrDup(szBuf);
1314	}
1315
1316	/* Work out the port number */
1317	if (RT_FAILURE(usbGetPortFromSysfsPath(pszSysfsPath, &Dev->bPort)))
1318	Dev->enmState = USBDEVICESTATE_UNSUPPORTED;
1319
1320	/* Check the interfaces to see if we can support the device. */
1321	char **ppszIf;
1322	VEC_FOR_EACH(&pInfo->mvecpszInterfaces, char *, ppszIf)
1323	{
1324	ssize_t cb = RTLinuxSysFsGetLinkDest(szBuf, sizeof(szBuf), "%s/driver",
1325	*ppszIf);
1326	if (cb > 0 && Dev->enmState != USBDEVICESTATE_UNSUPPORTED)
1327	Dev->enmState = (strcmp(szBuf, "hub") == 0)
1328	? USBDEVICESTATE_UNSUPPORTED
1329	: USBDEVICESTATE_USED_BY_HOST_CAPTURABLE;
1330	if (RTLinuxSysFsReadIntFile(16, "%s/bInterfaceClass",
1331	ppszIf) == 9 / hub */)
1332	Dev->enmState = USBDEVICESTATE_UNSUPPORTED;
1333	}
1334
1335	/* We use a double slash as a separator in the pszAddress field. This is
1336	* alright as the two paths can't contain a slash due to the way we build
1337	* them. */
1338	char *pszAddress = NULL;
1339	RTStrAPrintf(&pszAddress, "sysfs:%s//device:%s", pszSysfsPath,
1340	pInfo->mDevice);
1341	Dev->pszAddress = pszAddress;
1342
1343	/* Work out from the data collected whether we can support this device. */
1344	Dev->enmState = usbDeterminState(Dev);
1345	usbLogDevice(Dev);
1346	}
1347
1348	/**
1349	* USBProxyService::getDevices() implementation for sysfs.
1350	*/
1351	static PUSBDEVICE getDevicesFromSysfs(const char *pcszDevicesRoot, bool testfs)
1352	{
1353	#ifdef VBOX_USB_WITH_SYSFS
1354	/* Add each of the devices found to the chain. */
1355	PUSBDEVICE pFirst = NULL;
1356	PUSBDEVICE pLast = NULL;
1357	VECTOR_OBJ(USBDeviceInfo) vecDevInfo;
1358	USBDeviceInfo *pInfo;
1359	int rc;
1360
1361	VEC_INIT_OBJ(&vecDevInfo, USBDeviceInfo, USBDevInfoCleanup);
1362	rc = USBSysfsEnumerateHostDevices(pcszDevicesRoot, &vecDevInfo);
1363	if (RT_FAILURE(rc))
1364	return NULL;
1365	VEC_FOR_EACH(&vecDevInfo, USBDeviceInfo, pInfo)
1366	{
1367	USBDEVICE Dev = (USBDEVICE )RTMemAllocZ(sizeof(USBDEVICE));
1368	if (!Dev)
1369	rc = VERR_NO_MEMORY;
1370	if (RT_SUCCESS(rc))
1371	{
1372	fillInDeviceFromSysfs(Dev, pInfo);
1373	}
1374	if ( RT_SUCCESS(rc)
1375	&& ( Dev->enmState != USBDEVICESTATE_UNSUPPORTED
1376	\|\| testfs)
1377	&& Dev->pszAddress != NULL
1378	)
1379	{
1380	if (pLast != NULL)
1381	{
1382	pLast->pNext = Dev;
1383	pLast = pLast->pNext;
1384	}
1385	else
1386	pFirst = pLast = Dev;
1387	}
1388	else
1389	deviceFree(Dev);
1390	if (RT_FAILURE(rc))
1391	break;
1392	}
1393	if (RT_FAILURE(rc))
1394	deviceListFree(&pFirst);
1395
1396	VEC_CLEANUP_OBJ(&vecDevInfo);
1397	return pFirst;
1398	#else /* !VBOX_USB_WITH_SYSFS */
1399	return NULL;
1400	#endif /* !VBOX_USB_WITH_SYSFS */
1401	}
1402
1403	#ifdef UNIT_TEST
1404	/* Set up mock functions for USBProxyLinuxCheckDeviceRoot - here dlsym and close
1405	* for the inotify presence check. */
1406	static int testInotifyInitGood(void) { return 0; }
1407	static int testInotifyInitBad(void) { return -1; }
1408	static bool s_fHaveInotifyLibC = true;
1409	static bool s_fHaveInotifyKernel = true;
1410
1411	static void testDLSym(void handle, const char *symbol)
1412	{
1413	Assert(handle == RTLD_DEFAULT);
1414	Assert(!RTStrCmp(symbol, "inotify_init"));
1415	if (!s_fHaveInotifyLibC)
1416	return NULL;
1417	if (s_fHaveInotifyKernel)
1418	return (void *)testInotifyInitGood;
1419	return (void *)testInotifyInitBad;
1420	}
1421
1422	void TestUSBSetInotifyAvailable(bool fHaveInotifyLibC, bool fHaveInotifyKernel)
1423	{
1424	s_fHaveInotifyLibC = fHaveInotifyLibC;
1425	s_fHaveInotifyKernel = fHaveInotifyKernel;
1426	}
1427	# define dlsym testDLSym
1428	# define close(a) do {} while(0)
1429	#endif
1430
1431	/** Is inotify available and working on this system? This is a requirement
1432	* for using USB with sysfs */
1433	static bool inotifyAvailable(void)
1434	{
1435	int (*inotify_init)(void);
1436
1437	(void *)(&inotify_init) = dlsym(RTLD_DEFAULT, "inotify_init");
1438	if (!inotify_init)
1439	return false;
1440	int fd = inotify_init();
1441	if (fd == -1)
1442	return false;
1443	close(fd);
1444	return true;
1445	}
1446
1447	#ifdef UNIT_TEST
1448	# undef dlsym
1449	# undef close
1450	#endif
1451
1452	#ifdef UNIT_TEST
1453	/** Unit test list of usbfs addresses of connected devices. */
1454	static const char **s_pacszUsbfsDeviceAddresses = NULL;
1455
1456	static PUSBDEVICE testGetUsbfsDevices(const char *pcszUsbfsRoot, bool testfs)
1457	{
1458	const char **pcsz;
1459	PUSBDEVICE pList = NULL, pTail = NULL;
1460	for (pcsz = s_pacszUsbfsDeviceAddresses; pcsz && *pcsz; ++pcsz)
1461	{
1462	PUSBDEVICE pNext = (PUSBDEVICE)RTMemAllocZ(sizeof(USBDEVICE));
1463	if (pNext)
1464	pNext->pszAddress = RTStrDup(*pcsz);
1465	if (!pNext \|\| !pNext->pszAddress)
1466	{
1467	deviceListFree(&pList);
1468	return NULL;
1469	}
1470	if (pTail)
1471	pTail->pNext = pNext;
1472	else
1473	pList = pNext;
1474	pTail = pNext;
1475	}
1476	return pList;
1477	}
1478	# define getDevicesFromUsbfs testGetUsbfsDevices
1479
1480	void TestUSBSetAvailableUsbfsDevices(const char **pacszDeviceAddresses)
1481	{
1482	s_pacszUsbfsDeviceAddresses = pacszDeviceAddresses;
1483	}
1484
1485	/** Unit test list of files reported as accessible by access(3). We only do
1486	* accessible or not accessible. */
1487	static const char **s_pacszAccessibleFiles = NULL;
1488
1489	static int testAccess(const char *pcszPath, int mode)
1490	{
1491	const char **pcsz;
1492	for (pcsz = s_pacszAccessibleFiles; pcsz && *pcsz; ++pcsz)
1493	if (!RTStrCmp(pcszPath, *pcsz))
1494	return 0;
1495	return -1;
1496	}
1497	# define access testAccess
1498
1499	void TestUSBSetAccessibleFiles(const char **pacszAccessibleFiles)
1500	{
1501	s_pacszAccessibleFiles = pacszAccessibleFiles;
1502	}
1503	#endif
1504
1505	bool USBProxyLinuxCheckDeviceRoot(const char *pcszRoot, bool fIsDeviceNodes)
1506	{
1507	bool fOK = false;
1508	if (!fIsDeviceNodes) /* usbfs */
1509	{
1510	PUSBDEVICE pDevices;
1511
1512	if (!access(pcszRoot, R_OK \| X_OK))
1513	{
1514	fOK = true;
1515	pDevices = getDevicesFromUsbfs(pcszRoot, true);
1516	if (pDevices)
1517	{
1518	PUSBDEVICE pDevice;
1519
1520	for (pDevice = pDevices; pDevice && fOK; pDevice = pDevice->pNext)
1521	if (access(pDevice->pszAddress, R_OK \| W_OK))
1522	fOK = false;
1523	deviceListFree(&pDevices);
1524	}
1525	}
1526	}
1527	else /* device nodes */
1528	if (inotifyAvailable() && !access(pcszRoot, R_OK \| X_OK))
1529	fOK = true;
1530	return fOK;
1531	}
1532
1533	#ifdef UNIT_TEST
1534	# undef getDevicesFromUsbfs
1535	# undef access
1536	#endif
1537
1538	PUSBDEVICE USBProxyLinuxGetDevices(const char *pcszDevicesRoot,
1539	bool fUseSysfs)
1540	{
1541	if (!fUseSysfs)
1542	return getDevicesFromUsbfs(pcszDevicesRoot, false);
1543	else
1544	return getDevicesFromSysfs(pcszDevicesRoot, false);
1545	}

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source: vbox/trunk/src/VBox/Main/src-server/linux/USBGetDevices.cpp@ 37390

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