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1 /*
2 * Media Transfer Protocol implementation, backed by host filesystem.
3 *
4 * Copyright Red Hat, Inc 2014
5 *
6 * Author:
7 * Gerd Hoffmann <kraxel@redhat.com>
8 *
9 * This code is licensed under the GPL v2 or later.
10 */
11
12 #include "qemu/osdep.h"
13 #include "qapi/error.h"
14 #include "qemu/error-report.h"
15 #include <wchar.h>
16 #include <dirent.h>
17 #include <glib/gstdio.h>
18 #include <sys/statvfs.h>
19
20
21 #include "qemu/iov.h"
22 #include "qemu/module.h"
23 #include "qemu/filemonitor.h"
24 #include "trace.h"
25 #include "hw/core/qdev-properties.h"
26 #include "hw/usb/usb.h"
27 #include "migration/vmstate.h"
28 #include "desc.h"
29 #include "qemu/units.h"
30 #include "qom/object.h"
31
32 /* ----------------------------------------------------------------------- */
33
34 enum mtp_container_type {
35 TYPE_COMMAND = 1,
36 TYPE_DATA = 2,
37 TYPE_RESPONSE = 3,
38 TYPE_EVENT = 4,
39 };
40
41 /* MTP write stage, for internal use only */
42 enum mtp_write_status {
43 WRITE_START = 1,
44 WRITE_CONTINUE = 2,
45 WRITE_END = 3,
46 };
47
48 enum mtp_code {
49 /* command codes */
50 CMD_GET_DEVICE_INFO = 0x1001,
51 CMD_OPEN_SESSION = 0x1002,
52 CMD_CLOSE_SESSION = 0x1003,
53 CMD_GET_STORAGE_IDS = 0x1004,
54 CMD_GET_STORAGE_INFO = 0x1005,
55 CMD_GET_NUM_OBJECTS = 0x1006,
56 CMD_GET_OBJECT_HANDLES = 0x1007,
57 CMD_GET_OBJECT_INFO = 0x1008,
58 CMD_GET_OBJECT = 0x1009,
59 CMD_DELETE_OBJECT = 0x100b,
60 CMD_SEND_OBJECT_INFO = 0x100c,
61 CMD_SEND_OBJECT = 0x100d,
62 CMD_GET_PARTIAL_OBJECT = 0x101b,
63 CMD_GET_OBJECT_PROPS_SUPPORTED = 0x9801,
64 CMD_GET_OBJECT_PROP_DESC = 0x9802,
65 CMD_GET_OBJECT_PROP_VALUE = 0x9803,
66
67 /* response codes */
68 RES_OK = 0x2001,
69 RES_GENERAL_ERROR = 0x2002,
70 RES_SESSION_NOT_OPEN = 0x2003,
71 RES_INVALID_TRANSACTION_ID = 0x2004,
72 RES_OPERATION_NOT_SUPPORTED = 0x2005,
73 RES_PARAMETER_NOT_SUPPORTED = 0x2006,
74 RES_INCOMPLETE_TRANSFER = 0x2007,
75 RES_INVALID_STORAGE_ID = 0x2008,
76 RES_INVALID_OBJECT_HANDLE = 0x2009,
77 RES_INVALID_OBJECT_FORMAT_CODE = 0x200b,
78 RES_STORE_FULL = 0x200c,
79 RES_STORE_READ_ONLY = 0x200e,
80 RES_PARTIAL_DELETE = 0x2012,
81 RES_STORE_NOT_AVAILABLE = 0x2013,
82 RES_SPEC_BY_FORMAT_UNSUPPORTED = 0x2014,
83 RES_INVALID_OBJECTINFO = 0x2015,
84 RES_DESTINATION_UNSUPPORTED = 0x2020,
85 RES_INVALID_PARENT_OBJECT = 0x201a,
86 RES_INVALID_PARAMETER = 0x201d,
87 RES_SESSION_ALREADY_OPEN = 0x201e,
88 RES_INVALID_OBJECT_PROP_CODE = 0xA801,
89
90 /* format codes */
91 FMT_UNDEFINED_OBJECT = 0x3000,
92 FMT_ASSOCIATION = 0x3001,
93
94 /* event codes */
95 EVT_CANCEL_TRANSACTION = 0x4001,
96 EVT_OBJ_ADDED = 0x4002,
97 EVT_OBJ_REMOVED = 0x4003,
98 EVT_OBJ_INFO_CHANGED = 0x4007,
99
100 /* object properties */
101 PROP_STORAGE_ID = 0xDC01,
102 PROP_OBJECT_FORMAT = 0xDC02,
103 PROP_OBJECT_COMPRESSED_SIZE = 0xDC04,
104 PROP_PARENT_OBJECT = 0xDC0B,
105 PROP_PERSISTENT_UNIQUE_OBJECT_IDENTIFIER = 0xDC41,
106 PROP_NAME = 0xDC44,
107 };
108
109 enum mtp_data_type {
110 DATA_TYPE_UINT16 = 0x0004,
111 DATA_TYPE_UINT32 = 0x0006,
112 DATA_TYPE_UINT64 = 0x0008,
113 DATA_TYPE_UINT128 = 0x000a,
114 DATA_TYPE_STRING = 0xffff,
115 };
116
117 typedef struct {
118 uint32_t length;
119 uint16_t type;
120 uint16_t code;
121 uint32_t trans;
122 } QEMU_PACKED mtp_container;
123
124 /* ----------------------------------------------------------------------- */
125
126 typedef struct MTPControl MTPControl;
127 typedef struct MTPData MTPData;
128 typedef struct MTPObject MTPObject;
129
130 #define TYPE_USB_MTP "usb-mtp"
131 OBJECT_DECLARE_SIMPLE_TYPE(MTPState, USB_MTP)
132
133 enum {
134 EP_DATA_IN = 1,
135 EP_DATA_OUT,
136 EP_EVENT,
137 };
138
139 typedef struct MTPMonEntry MTPMonEntry;
140
141 struct MTPMonEntry {
142 uint32_t event;
143 uint32_t handle;
144
145 QTAILQ_ENTRY(MTPMonEntry) next;
146 };
147
148 struct MTPControl {
149 uint16_t code;
150 uint32_t trans;
151 int argc;
152 uint32_t argv[5];
153 };
154
155 struct MTPData {
156 uint16_t code;
157 uint32_t trans;
158 uint64_t offset;
159 uint64_t length;
160 uint64_t alloc;
161 uint8_t *data;
162 bool first;
163 /* Used for >4G file sizes */
164 bool pending;
165 int fd;
166 uint8_t write_status;
167 /* Internal pointer per every MTP_WRITE_BUF_SZ */
168 uint64_t data_offset;
169 };
170
171 struct MTPObject {
172 uint32_t handle;
173 uint16_t format;
174 char *name;
175 char *path;
176 struct stat stat;
177 /* file monitor watch id */
178 int64_t watchid;
179 MTPObject *parent;
180 uint32_t nchildren;
181 QLIST_HEAD(, MTPObject) children;
182 QLIST_ENTRY(MTPObject) list;
183 bool have_children;
184 QTAILQ_ENTRY(MTPObject) next;
185 };
186
187 struct MTPState {
188 USBDevice dev;
189 char *root;
190 char *desc;
191 uint32_t flags;
192
193 MTPData *data_in;
194 MTPData *data_out;
195 MTPControl *result;
196 uint32_t session;
197 uint32_t next_handle;
198 bool readonly;
199
200 QTAILQ_HEAD(, MTPObject) objects;
201 QFileMonitor *file_monitor;
202 QTAILQ_HEAD(, MTPMonEntry) events;
203 /* Responder is expecting a write operation */
204 bool write_pending;
205 struct {
206 uint32_t parent_handle;
207 uint16_t format;
208 uint32_t size;
209 char *filename;
210 } dataset;
211 };
212
213 /*
214 * ObjectInfo dataset received from initiator
215 * Fields we don't care about are ignored
216 */
217 typedef struct {
218 uint32_t storage_id; /*unused*/
219 uint16_t format;
220 uint16_t protection_status; /*unused*/
221 uint32_t size;
222 uint16_t thumb_format; /*unused*/
223 uint32_t thumb_comp_sz; /*unused*/
224 uint32_t thumb_pix_width; /*unused*/
225 uint32_t thumb_pix_height; /*unused*/
226 uint32_t image_pix_width; /*unused*/
227 uint32_t image_pix_height; /*unused*/
228 uint32_t image_bit_depth; /*unused*/
229 uint32_t parent; /*unused*/
230 uint16_t assoc_type;
231 uint32_t assoc_desc;
232 uint32_t seq_no; /*unused*/
233 uint8_t length; /*part of filename field*/
234 uint8_t filename[0]; /* UTF-16 encoded */
235 char date_created[0]; /*unused*/
236 char date_modified[0]; /*unused*/
237 char keywords[0]; /*unused*/
238 /* string and other data follows */
239 } QEMU_PACKED ObjectInfo;
240
241 #define QEMU_STORAGE_ID 0x00010001
242
243 #define MTP_FLAG_WRITABLE 0
244
245 #define FLAG_SET(_mtp, _flag) ((_mtp)->flags & (1 << (_flag)))
246
247 /* ----------------------------------------------------------------------- */
248
249 #define MTP_MANUFACTURER "QEMU"
250 #define MTP_PRODUCT "QEMU filesharing"
251 #define MTP_WRITE_BUF_SZ (512 * KiB)
252
253 enum {
254 STR_MANUFACTURER = 1,
255 STR_PRODUCT,
256 STR_SERIALNUMBER,
257 STR_MTP,
258 STR_CONFIG_FULL,
259 STR_CONFIG_HIGH,
260 STR_CONFIG_SUPER,
261 };
262
263 static const USBDescStrings desc_strings = {
264 [STR_MANUFACTURER] = MTP_MANUFACTURER,
265 [STR_PRODUCT] = MTP_PRODUCT,
266 [STR_SERIALNUMBER] = "34617",
267 [STR_MTP] = "MTP",
268 [STR_CONFIG_FULL] = "Full speed config (usb 1.1)",
269 [STR_CONFIG_HIGH] = "High speed config (usb 2.0)",
270 [STR_CONFIG_SUPER] = "Super speed config (usb 3.0)",
271 };
272
273 static const USBDescIface desc_iface_full = {
274 .bInterfaceNumber = 0,
275 .bNumEndpoints = 3,
276 .bInterfaceClass = USB_CLASS_STILL_IMAGE,
277 .bInterfaceSubClass = 0x01,
278 .bInterfaceProtocol = 0x01,
279 .iInterface = STR_MTP,
280 .eps = (USBDescEndpoint[]) {
281 {
282 .bEndpointAddress = USB_DIR_IN | EP_DATA_IN,
283 .bmAttributes = USB_ENDPOINT_XFER_BULK,
284 .wMaxPacketSize = 64,
285 },{
286 .bEndpointAddress = USB_DIR_OUT | EP_DATA_OUT,
287 .bmAttributes = USB_ENDPOINT_XFER_BULK,
288 .wMaxPacketSize = 64,
289 },{
290 .bEndpointAddress = USB_DIR_IN | EP_EVENT,
291 .bmAttributes = USB_ENDPOINT_XFER_INT,
292 .wMaxPacketSize = 64,
293 .bInterval = 0x0a,
294 },
295 }
296 };
297
298 static const USBDescDevice desc_device_full = {
299 .bcdUSB = 0x0200,
300 .bMaxPacketSize0 = 8,
301 .bNumConfigurations = 1,
302 .confs = (USBDescConfig[]) {
303 {
304 .bNumInterfaces = 1,
305 .bConfigurationValue = 1,
306 .iConfiguration = STR_CONFIG_FULL,
307 .bmAttributes = USB_CFG_ATT_ONE | USB_CFG_ATT_WAKEUP,
308 .bMaxPower = 2,
309 .nif = 1,
310 .ifs = &desc_iface_full,
311 },
312 },
313 };
314
315 static const USBDescIface desc_iface_high = {
316 .bInterfaceNumber = 0,
317 .bNumEndpoints = 3,
318 .bInterfaceClass = USB_CLASS_STILL_IMAGE,
319 .bInterfaceSubClass = 0x01,
320 .bInterfaceProtocol = 0x01,
321 .iInterface = STR_MTP,
322 .eps = (USBDescEndpoint[]) {
323 {
324 .bEndpointAddress = USB_DIR_IN | EP_DATA_IN,
325 .bmAttributes = USB_ENDPOINT_XFER_BULK,
326 .wMaxPacketSize = 512,
327 },{
328 .bEndpointAddress = USB_DIR_OUT | EP_DATA_OUT,
329 .bmAttributes = USB_ENDPOINT_XFER_BULK,
330 .wMaxPacketSize = 512,
331 },{
332 .bEndpointAddress = USB_DIR_IN | EP_EVENT,
333 .bmAttributes = USB_ENDPOINT_XFER_INT,
334 .wMaxPacketSize = 64,
335 .bInterval = 0x0a,
336 },
337 }
338 };
339
340 static const USBDescDevice desc_device_high = {
341 .bcdUSB = 0x0200,
342 .bMaxPacketSize0 = 64,
343 .bNumConfigurations = 1,
344 .confs = (USBDescConfig[]) {
345 {
346 .bNumInterfaces = 1,
347 .bConfigurationValue = 1,
348 .iConfiguration = STR_CONFIG_HIGH,
349 .bmAttributes = USB_CFG_ATT_ONE | USB_CFG_ATT_WAKEUP,
350 .bMaxPower = 2,
351 .nif = 1,
352 .ifs = &desc_iface_high,
353 },
354 },
355 };
356
357 static const USBDescMSOS desc_msos = {
358 .CompatibleID = "MTP",
359 .SelectiveSuspendEnabled = true,
360 };
361
362 static const USBDesc desc = {
363 .id = {
364 .idVendor = 0x46f4, /* CRC16() of "QEMU" */
365 .idProduct = 0x0004,
366 .bcdDevice = 0,
367 .iManufacturer = STR_MANUFACTURER,
368 .iProduct = STR_PRODUCT,
369 .iSerialNumber = STR_SERIALNUMBER,
370 },
371 .full = &desc_device_full,
372 .high = &desc_device_high,
373 .str = desc_strings,
374 .msos = &desc_msos,
375 };
376
377 /* ----------------------------------------------------------------------- */
378
379 static MTPObject *usb_mtp_object_alloc(MTPState *s, uint32_t handle,
380 MTPObject *parent, const char *name)
381 {
382 MTPObject *o = g_new0(MTPObject, 1);
383
384 if (name[0] == '.') {
385 goto ignore;
386 }
387
388 o->watchid = -1;
389 o->handle = handle;
390 o->parent = parent;
391 o->name = g_strdup(name);
392 if (parent == NULL) {
393 o->path = g_strdup(name);
394 } else {
395 o->path = g_strdup_printf("%s/%s", parent->path, name);
396 }
397
398 if (lstat(o->path, &o->stat) != 0) {
399 goto ignore;
400 }
401 if (S_ISREG(o->stat.st_mode)) {
402 o->format = FMT_UNDEFINED_OBJECT;
403 } else if (S_ISDIR(o->stat.st_mode)) {
404 o->format = FMT_ASSOCIATION;
405 } else {
406 goto ignore;
407 }
408
409 if (access(o->path, R_OK) != 0) {
410 goto ignore;
411 }
412
413 trace_usb_mtp_object_alloc(s->dev.addr, o->handle, o->path);
414
415 QTAILQ_INSERT_TAIL(&s->objects, o, next);
416 return o;
417
418 ignore:
419 g_free(o->name);
420 g_free(o->path);
421 g_free(o);
422 return NULL;
423 }
424
425 static void usb_mtp_object_free(MTPState *s, MTPObject *o)
426 {
427 MTPObject *iter;
428
429 if (!o) {
430 return;
431 }
432
433 trace_usb_mtp_object_free(s->dev.addr, o->handle, o->path);
434
435 if (o->watchid != -1 && s->file_monitor) {
436 qemu_file_monitor_remove_watch(s->file_monitor, o->path, o->watchid);
437 }
438
439 QTAILQ_REMOVE(&s->objects, o, next);
440 if (o->parent) {
441 QLIST_REMOVE(o, list);
442 o->parent->nchildren--;
443 }
444
445 while (!QLIST_EMPTY(&o->children)) {
446 iter = QLIST_FIRST(&o->children);
447 usb_mtp_object_free(s, iter);
448 }
449 g_free(o->name);
450 g_free(o->path);
451 g_free(o);
452 }
453
454 static MTPObject *usb_mtp_object_lookup(MTPState *s, uint32_t handle)
455 {
456 MTPObject *o;
457
458 QTAILQ_FOREACH(o, &s->objects, next) {
459 if (o->handle == handle) {
460 return o;
461 }
462 }
463 return NULL;
464 }
465
466 static MTPObject *usb_mtp_add_child(MTPState *s, MTPObject *o,
467 const char *name)
468 {
469 MTPObject *child =
470 usb_mtp_object_alloc(s, s->next_handle++, o, name);
471
472 if (child) {
473 trace_usb_mtp_add_child(s->dev.addr, child->handle, child->path);
474 QLIST_INSERT_HEAD(&o->children, child, list);
475 o->nchildren++;
476
477 if (child->format == FMT_ASSOCIATION) {
478 QLIST_INIT(&child->children);
479 }
480 }
481
482 return child;
483 }
484
485 static MTPObject *usb_mtp_object_lookup_name(MTPObject *parent,
486 const char *name, int len)
487 {
488 MTPObject *iter;
489
490 if (len == -1) {
491 len = strlen(name);
492 }
493
494 QLIST_FOREACH(iter, &parent->children, list) {
495 if (strncmp(iter->name, name, len) == 0) {
496 return iter;
497 }
498 }
499
500 return NULL;
501 }
502
503 static MTPObject *usb_mtp_object_lookup_id(MTPState *s, int64_t id)
504 {
505 MTPObject *iter;
506
507 QTAILQ_FOREACH(iter, &s->objects, next) {
508 if (iter->watchid == id) {
509 return iter;
510 }
511 }
512
513 return NULL;
514 }
515
516 static void file_monitor_event(int64_t id,
517 QFileMonitorEvent ev,
518 const char *name,
519 void *opaque)
520 {
521 MTPState *s = opaque;
522 MTPObject *parent = usb_mtp_object_lookup_id(s, id);
523 MTPMonEntry *entry = NULL;
524 MTPObject *o;
525
526 if (!parent) {
527 return;
528 }
529
530 switch (ev) {
531 case QFILE_MONITOR_EVENT_CREATED:
532 if (usb_mtp_object_lookup_name(parent, name, -1)) {
533 /* Duplicate create event */
534 return;
535 }
536 entry = g_new0(MTPMonEntry, 1);
537 entry->handle = s->next_handle;
538 entry->event = EVT_OBJ_ADDED;
539 o = usb_mtp_add_child(s, parent, name);
540 if (!o) {
541 g_free(entry);
542 return;
543 }
544 trace_usb_mtp_file_monitor_event(s->dev.addr, name, "Obj Added");
545 break;
546
547 case QFILE_MONITOR_EVENT_DELETED:
548 /*
549 * The kernel issues a IN_IGNORED event
550 * when a dir containing a watchpoint is
551 * deleted, so we don't have to delete the
552 * watchpoint
553 */
554 o = usb_mtp_object_lookup_name(parent, name, -1);
555 if (!o) {
556 return;
557 }
558 entry = g_new0(MTPMonEntry, 1);
559 entry->handle = o->handle;
560 entry->event = EVT_OBJ_REMOVED;
561 trace_usb_mtp_file_monitor_event(s->dev.addr, o->path, "Obj Deleted");
562 usb_mtp_object_free(s, o);
563 break;
564
565 case QFILE_MONITOR_EVENT_MODIFIED:
566 o = usb_mtp_object_lookup_name(parent, name, -1);
567 if (!o) {
568 return;
569 }
570 entry = g_new0(MTPMonEntry, 1);
571 entry->handle = o->handle;
572 entry->event = EVT_OBJ_INFO_CHANGED;
573 trace_usb_mtp_file_monitor_event(s->dev.addr, o->path, "Obj Modified");
574 break;
575
576 case QFILE_MONITOR_EVENT_IGNORED:
577 trace_usb_mtp_file_monitor_event(s->dev.addr, parent->path,
578 "Obj parent dir ignored");
579 break;
580
581 case QFILE_MONITOR_EVENT_ATTRIBUTES:
582 break;
583
584 default:
585 g_assert_not_reached();
586 }
587
588 if (entry) {
589 QTAILQ_INSERT_HEAD(&s->events, entry, next);
590 }
591 }
592
593 static void usb_mtp_file_monitor_cleanup(MTPState *s)
594 {
595 MTPMonEntry *e, *p;
596
597 QTAILQ_FOREACH_SAFE(e, &s->events, next, p) {
598 QTAILQ_REMOVE(&s->events, e, next);
599 g_free(e);
600 }
601
602 qemu_file_monitor_free(s->file_monitor);
603 s->file_monitor = NULL;
604 }
605
606
607 static void usb_mtp_object_readdir(MTPState *s, MTPObject *o)
608 {
609 struct dirent *entry;
610 DIR *dir;
611 int fd;
612 Error *err = NULL;
613
614 if (o->have_children) {
615 return;
616 }
617 o->have_children = true;
618
619 fd = open(o->path, O_DIRECTORY | O_CLOEXEC | O_NOFOLLOW);
620 if (fd < 0) {
621 return;
622 }
623 dir = fdopendir(fd);
624 if (!dir) {
625 close(fd);
626 return;
627 }
628
629 if (s->file_monitor) {
630 int64_t id = qemu_file_monitor_add_watch(s->file_monitor, o->path, NULL,
631 file_monitor_event, s, &err);
632 if (id == -1) {
633 error_reportf_err(err,
634 "usb-mtp: failed to add watch for %s: ",
635 o->path);
636 } else {
637 trace_usb_mtp_file_monitor_event(s->dev.addr, o->path,
638 "Watch Added");
639 o->watchid = id;
640 }
641 }
642
643 while ((entry = readdir(dir)) != NULL) {
644 usb_mtp_add_child(s, o, entry->d_name);
645 }
646 closedir(dir);
647 }
648
649 /* ----------------------------------------------------------------------- */
650
651 static MTPData *usb_mtp_data_alloc(MTPControl *c)
652 {
653 MTPData *data = g_new0(MTPData, 1);
654
655 data->code = c->code;
656 data->trans = c->trans;
657 data->fd = -1;
658 data->first = true;
659 return data;
660 }
661
662 static void usb_mtp_data_free(MTPData *data)
663 {
664 if (data == NULL) {
665 return;
666 }
667 if (data->fd != -1) {
668 close(data->fd);
669 }
670 g_free(data->data);
671 g_free(data);
672 }
673
674 static void usb_mtp_realloc(MTPData *data, uint32_t bytes)
675 {
676 if (data->length + bytes <= data->alloc) {
677 return;
678 }
679 data->alloc = (data->length + bytes + 0xff) & ~0xff;
680 data->data = g_realloc(data->data, data->alloc);
681 }
682
683 static void usb_mtp_add_u8(MTPData *data, uint8_t val)
684 {
685 usb_mtp_realloc(data, 1);
686 data->data[data->length++] = val;
687 }
688
689 static void usb_mtp_add_u16(MTPData *data, uint16_t val)
690 {
691 usb_mtp_realloc(data, 2);
692 data->data[data->length++] = (val >> 0) & 0xff;
693 data->data[data->length++] = (val >> 8) & 0xff;
694 }
695
696 static void usb_mtp_add_u32(MTPData *data, uint32_t val)
697 {
698 usb_mtp_realloc(data, 4);
699 data->data[data->length++] = (val >> 0) & 0xff;
700 data->data[data->length++] = (val >> 8) & 0xff;
701 data->data[data->length++] = (val >> 16) & 0xff;
702 data->data[data->length++] = (val >> 24) & 0xff;
703 }
704
705 static void usb_mtp_add_u64(MTPData *data, uint64_t val)
706 {
707 usb_mtp_realloc(data, 8);
708 data->data[data->length++] = (val >> 0) & 0xff;
709 data->data[data->length++] = (val >> 8) & 0xff;
710 data->data[data->length++] = (val >> 16) & 0xff;
711 data->data[data->length++] = (val >> 24) & 0xff;
712 data->data[data->length++] = (val >> 32) & 0xff;
713 data->data[data->length++] = (val >> 40) & 0xff;
714 data->data[data->length++] = (val >> 48) & 0xff;
715 data->data[data->length++] = (val >> 56) & 0xff;
716 }
717
718 static void usb_mtp_add_u16_array(MTPData *data, uint32_t len,
719 const uint16_t *vals)
720 {
721 int i;
722
723 usb_mtp_add_u32(data, len);
724 for (i = 0; i < len; i++) {
725 usb_mtp_add_u16(data, vals[i]);
726 }
727 }
728
729 static void usb_mtp_add_u32_array(MTPData *data, uint32_t len,
730 const uint32_t *vals)
731 {
732 int i;
733
734 usb_mtp_add_u32(data, len);
735 for (i = 0; i < len; i++) {
736 usb_mtp_add_u32(data, vals[i]);
737 }
738 }
739
740 static void usb_mtp_add_wstr(MTPData *data, const wchar_t *str)
741 {
742 uint32_t len = wcslen(str);
743 int i;
744
745 if (len > 0) {
746 len++; /* include terminating L'\0' */
747 }
748
749 usb_mtp_add_u8(data, len);
750 for (i = 0; i < len; i++) {
751 usb_mtp_add_u16(data, str[i]);
752 }
753 }
754
755 static void usb_mtp_add_str(MTPData *data, const char *str)
756 {
757 uint32_t len = strlen(str)+1;
758 wchar_t *wstr = g_new(wchar_t, len);
759 size_t ret;
760
761 ret = mbstowcs(wstr, str, len);
762 if (ret == -1) {
763 usb_mtp_add_wstr(data, L"Oops");
764 } else {
765 usb_mtp_add_wstr(data, wstr);
766 }
767
768 g_free(wstr);
769 }
770
771 static void usb_mtp_add_time(MTPData *data, time_t time)
772 {
773 g_autoptr(GDateTime) then = g_date_time_new_from_unix_utc(time);
774 g_autofree char *thenstr = g_date_time_format(then, "%Y%m%dT%H%M%S");
775 usb_mtp_add_str(data, thenstr);
776 }
777
778 /* ----------------------------------------------------------------------- */
779
780 static void usb_mtp_queue_result(MTPState *s, uint16_t code, uint32_t trans,
781 int argc, uint32_t arg0, uint32_t arg1,
782 uint32_t arg2)
783 {
784 MTPControl *c = g_new0(MTPControl, 1);
785
786 c->code = code;
787 c->trans = trans;
788 c->argc = argc;
789 if (argc > 0) {
790 c->argv[0] = arg0;
791 }
792 if (argc > 1) {
793 c->argv[1] = arg1;
794 }
795 if (argc > 2) {
796 c->argv[2] = arg2;
797 }
798
799 assert(s->result == NULL);
800 s->result = c;
801 }
802
803 /* ----------------------------------------------------------------------- */
804
805 static MTPData *usb_mtp_get_device_info(MTPState *s, MTPControl *c)
806 {
807 static const uint16_t ops[] = {
808 CMD_GET_DEVICE_INFO,
809 CMD_OPEN_SESSION,
810 CMD_CLOSE_SESSION,
811 CMD_GET_STORAGE_IDS,
812 CMD_GET_STORAGE_INFO,
813 CMD_GET_NUM_OBJECTS,
814 CMD_GET_OBJECT_HANDLES,
815 CMD_GET_OBJECT_INFO,
816 CMD_DELETE_OBJECT,
817 CMD_SEND_OBJECT_INFO,
818 CMD_SEND_OBJECT,
819 CMD_GET_OBJECT,
820 CMD_GET_PARTIAL_OBJECT,
821 CMD_GET_OBJECT_PROPS_SUPPORTED,
822 CMD_GET_OBJECT_PROP_DESC,
823 CMD_GET_OBJECT_PROP_VALUE,
824 };
825 static const uint16_t fmt[] = {
826 FMT_UNDEFINED_OBJECT,
827 FMT_ASSOCIATION,
828 };
829 MTPData *d = usb_mtp_data_alloc(c);
830
831 trace_usb_mtp_op_get_device_info(s->dev.addr);
832
833 usb_mtp_add_u16(d, 100);
834 usb_mtp_add_u32(d, 0x00000006);
835 usb_mtp_add_u16(d, 0x0064);
836 usb_mtp_add_wstr(d, L"");
837 usb_mtp_add_u16(d, 0x0000);
838
839 usb_mtp_add_u16_array(d, ARRAY_SIZE(ops), ops);
840 usb_mtp_add_u16_array(d, 0, NULL);
841 usb_mtp_add_u16_array(d, 0, NULL);
842 usb_mtp_add_u16_array(d, 0, NULL);
843 usb_mtp_add_u16_array(d, ARRAY_SIZE(fmt), fmt);
844
845 usb_mtp_add_wstr(d, L"" MTP_MANUFACTURER);
846 usb_mtp_add_wstr(d, L"" MTP_PRODUCT);
847 usb_mtp_add_wstr(d, L"0.1");
848 usb_mtp_add_wstr(d, L"0123456789abcdef0123456789abcdef");
849
850 return d;
851 }
852
853 static MTPData *usb_mtp_get_storage_ids(MTPState *s, MTPControl *c)
854 {
855 static const uint32_t ids[] = {
856 QEMU_STORAGE_ID,
857 };
858 MTPData *d = usb_mtp_data_alloc(c);
859
860 trace_usb_mtp_op_get_storage_ids(s->dev.addr);
861
862 usb_mtp_add_u32_array(d, ARRAY_SIZE(ids), ids);
863
864 return d;
865 }
866
867 static MTPData *usb_mtp_get_storage_info(MTPState *s, MTPControl *c)
868 {
869 MTPData *d = usb_mtp_data_alloc(c);
870 struct statvfs buf;
871 int rc;
872
873 trace_usb_mtp_op_get_storage_info(s->dev.addr);
874
875 if (FLAG_SET(s, MTP_FLAG_WRITABLE)) {
876 usb_mtp_add_u16(d, 0x0003);
877 usb_mtp_add_u16(d, 0x0002);
878 usb_mtp_add_u16(d, 0x0000);
879 } else {
880 usb_mtp_add_u16(d, 0x0001);
881 usb_mtp_add_u16(d, 0x0002);
882 usb_mtp_add_u16(d, 0x0001);
883 }
884
885 rc = statvfs(s->root, &buf);
886 if (rc == 0) {
887 usb_mtp_add_u64(d, (uint64_t)buf.f_frsize * buf.f_blocks);
888 usb_mtp_add_u64(d, (uint64_t)buf.f_frsize * buf.f_bavail);
889 usb_mtp_add_u32(d, buf.f_ffree);
890 } else {
891 usb_mtp_add_u64(d, 0xffffffff);
892 usb_mtp_add_u64(d, 0xffffffff);
893 usb_mtp_add_u32(d, 0xffffffff);
894 }
895
896 usb_mtp_add_str(d, s->desc);
897 usb_mtp_add_wstr(d, L"123456789abcdef");
898 return d;
899 }
900
901 static MTPData *usb_mtp_get_object_handles(MTPState *s, MTPControl *c,
902 MTPObject *o)
903 {
904 MTPData *d = usb_mtp_data_alloc(c);
905 uint32_t i = 0;
906 g_autofree uint32_t *handles = g_new(uint32_t, o->nchildren);
907 MTPObject *iter;
908
909 trace_usb_mtp_op_get_object_handles(s->dev.addr, o->handle, o->path);
910
911 QLIST_FOREACH(iter, &o->children, list) {
912 handles[i++] = iter->handle;
913 }
914 assert(i == o->nchildren);
915 usb_mtp_add_u32_array(d, o->nchildren, handles);
916
917 return d;
918 }
919
920 static MTPData *usb_mtp_get_object_info(MTPState *s, MTPControl *c,
921 MTPObject *o)
922 {
923 MTPData *d = usb_mtp_data_alloc(c);
924
925 trace_usb_mtp_op_get_object_info(s->dev.addr, o->handle, o->path);
926
927 usb_mtp_add_u32(d, QEMU_STORAGE_ID);
928 usb_mtp_add_u16(d, o->format);
929 usb_mtp_add_u16(d, 0);
930
931 if (o->stat.st_size > 0xFFFFFFFF) {
932 usb_mtp_add_u32(d, 0xFFFFFFFF);
933 } else {
934 usb_mtp_add_u32(d, o->stat.st_size);
935 }
936
937 usb_mtp_add_u16(d, 0);
938 usb_mtp_add_u32(d, 0);
939 usb_mtp_add_u32(d, 0);
940 usb_mtp_add_u32(d, 0);
941 usb_mtp_add_u32(d, 0);
942 usb_mtp_add_u32(d, 0);
943 usb_mtp_add_u32(d, 0);
944
945 if (o->parent) {
946 usb_mtp_add_u32(d, o->parent->handle);
947 } else {
948 usb_mtp_add_u32(d, 0);
949 }
950 if (o->format == FMT_ASSOCIATION) {
951 usb_mtp_add_u16(d, 0x0001);
952 usb_mtp_add_u32(d, 0x00000001);
953 usb_mtp_add_u32(d, 0);
954 } else {
955 usb_mtp_add_u16(d, 0);
956 usb_mtp_add_u32(d, 0);
957 usb_mtp_add_u32(d, 0);
958 }
959
960 usb_mtp_add_str(d, o->name);
961 usb_mtp_add_time(d, o->stat.st_ctime);
962 usb_mtp_add_time(d, o->stat.st_mtime);
963 usb_mtp_add_wstr(d, L"");
964
965 return d;
966 }
967
968 static MTPData *usb_mtp_get_object(MTPState *s, MTPControl *c,
969 MTPObject *o)
970 {
971 MTPData *d = usb_mtp_data_alloc(c);
972
973 trace_usb_mtp_op_get_object(s->dev.addr, o->handle, o->path);
974
975 d->fd = open(o->path, O_RDONLY | O_CLOEXEC | O_NOFOLLOW);
976 if (d->fd == -1) {
977 usb_mtp_data_free(d);
978 return NULL;
979 }
980 d->length = o->stat.st_size;
981 d->alloc = 512;
982 d->data = g_malloc(d->alloc);
983 return d;
984 }
985
986 static MTPData *usb_mtp_get_partial_object(MTPState *s, MTPControl *c,
987 MTPObject *o)
988 {
989 MTPData *d;
990 off_t offset;
991
992 if (c->argc <= 2) {
993 return NULL;
994 }
995 trace_usb_mtp_op_get_partial_object(s->dev.addr, o->handle, o->path,
996 c->argv[1], c->argv[2]);
997
998 d = usb_mtp_data_alloc(c);
999 d->fd = open(o->path, O_RDONLY | O_CLOEXEC | O_NOFOLLOW);
1000 if (d->fd == -1) {
1001 usb_mtp_data_free(d);
1002 return NULL;
1003 }
1004
1005 offset = c->argv[1];
1006 if (offset > o->stat.st_size) {
1007 offset = o->stat.st_size;
1008 }
1009 if (lseek(d->fd, offset, SEEK_SET) < 0) {
1010 usb_mtp_data_free(d);
1011 return NULL;
1012 }
1013
1014 d->length = c->argv[2];
1015 if (d->length > o->stat.st_size - offset) {
1016 d->length = o->stat.st_size - offset;
1017 }
1018
1019 return d;
1020 }
1021
1022 static MTPData *usb_mtp_get_object_props_supported(MTPState *s, MTPControl *c)
1023 {
1024 static const uint16_t props[] = {
1025 PROP_STORAGE_ID,
1026 PROP_OBJECT_FORMAT,
1027 PROP_OBJECT_COMPRESSED_SIZE,
1028 PROP_PARENT_OBJECT,
1029 PROP_PERSISTENT_UNIQUE_OBJECT_IDENTIFIER,
1030 PROP_NAME,
1031 };
1032 MTPData *d = usb_mtp_data_alloc(c);
1033 usb_mtp_add_u16_array(d, ARRAY_SIZE(props), props);
1034
1035 return d;
1036 }
1037
1038 static MTPData *usb_mtp_get_object_prop_desc(MTPState *s, MTPControl *c)
1039 {
1040 MTPData *d = usb_mtp_data_alloc(c);
1041 switch (c->argv[0]) {
1042 case PROP_STORAGE_ID:
1043 usb_mtp_add_u16(d, PROP_STORAGE_ID);
1044 usb_mtp_add_u16(d, DATA_TYPE_UINT32);
1045 usb_mtp_add_u8(d, 0x00);
1046 usb_mtp_add_u32(d, 0x00000000);
1047 usb_mtp_add_u32(d, 0x00000000);
1048 usb_mtp_add_u8(d, 0x00);
1049 break;
1050 case PROP_OBJECT_FORMAT:
1051 usb_mtp_add_u16(d, PROP_OBJECT_FORMAT);
1052 usb_mtp_add_u16(d, DATA_TYPE_UINT16);
1053 usb_mtp_add_u8(d, 0x00);
1054 usb_mtp_add_u16(d, 0x0000);
1055 usb_mtp_add_u32(d, 0x00000000);
1056 usb_mtp_add_u8(d, 0x00);
1057 break;
1058 case PROP_OBJECT_COMPRESSED_SIZE:
1059 usb_mtp_add_u16(d, PROP_OBJECT_COMPRESSED_SIZE);
1060 usb_mtp_add_u16(d, DATA_TYPE_UINT64);
1061 usb_mtp_add_u8(d, 0x00);
1062 usb_mtp_add_u64(d, 0x0000000000000000);
1063 usb_mtp_add_u32(d, 0x00000000);
1064 usb_mtp_add_u8(d, 0x00);
1065 break;
1066 case PROP_PARENT_OBJECT:
1067 usb_mtp_add_u16(d, PROP_PARENT_OBJECT);
1068 usb_mtp_add_u16(d, DATA_TYPE_UINT32);
1069 usb_mtp_add_u8(d, 0x00);
1070 usb_mtp_add_u32(d, 0x00000000);
1071 usb_mtp_add_u32(d, 0x00000000);
1072 usb_mtp_add_u8(d, 0x00);
1073 break;
1074 case PROP_PERSISTENT_UNIQUE_OBJECT_IDENTIFIER:
1075 usb_mtp_add_u16(d, PROP_PERSISTENT_UNIQUE_OBJECT_IDENTIFIER);
1076 usb_mtp_add_u16(d, DATA_TYPE_UINT128);
1077 usb_mtp_add_u8(d, 0x00);
1078 usb_mtp_add_u64(d, 0x0000000000000000);
1079 usb_mtp_add_u64(d, 0x0000000000000000);
1080 usb_mtp_add_u32(d, 0x00000000);
1081 usb_mtp_add_u8(d, 0x00);
1082 break;
1083 case PROP_NAME:
1084 usb_mtp_add_u16(d, PROP_NAME);
1085 usb_mtp_add_u16(d, DATA_TYPE_STRING);
1086 usb_mtp_add_u8(d, 0x00);
1087 usb_mtp_add_u8(d, 0x00);
1088 usb_mtp_add_u32(d, 0x00000000);
1089 usb_mtp_add_u8(d, 0x00);
1090 break;
1091 default:
1092 usb_mtp_data_free(d);
1093 return NULL;
1094 }
1095
1096 return d;
1097 }
1098
1099 static MTPData *usb_mtp_get_object_prop_value(MTPState *s, MTPControl *c,
1100 MTPObject *o)
1101 {
1102 MTPData *d = usb_mtp_data_alloc(c);
1103 switch (c->argv[1]) {
1104 case PROP_STORAGE_ID:
1105 usb_mtp_add_u32(d, QEMU_STORAGE_ID);
1106 break;
1107 case PROP_OBJECT_FORMAT:
1108 usb_mtp_add_u16(d, o->format);
1109 break;
1110 case PROP_OBJECT_COMPRESSED_SIZE:
1111 usb_mtp_add_u64(d, o->stat.st_size);
1112 break;
1113 case PROP_PARENT_OBJECT:
1114 if (o->parent == NULL) {
1115 usb_mtp_add_u32(d, 0x00000000);
1116 } else {
1117 usb_mtp_add_u32(d, o->parent->handle);
1118 }
1119 break;
1120 case PROP_PERSISTENT_UNIQUE_OBJECT_IDENTIFIER:
1121 /* Should be persistent between sessions,
1122 * but using our objedt ID is "good enough"
1123 * for now */
1124 usb_mtp_add_u64(d, 0x0000000000000000);
1125 usb_mtp_add_u64(d, o->handle);
1126 break;
1127 case PROP_NAME:
1128 usb_mtp_add_str(d, o->name);
1129 break;
1130 default:
1131 usb_mtp_data_free(d);
1132 return NULL;
1133 }
1134
1135 return d;
1136 }
1137
1138 /*
1139 * Return values when object @o is deleted.
1140 * If at least one of the deletions succeeded,
1141 * DELETE_SUCCESS is set and if at least one
1142 * of the deletions failed, DELETE_FAILURE is
1143 * set. Both bits being set (DELETE_PARTIAL)
1144 * signifies a RES_PARTIAL_DELETE being sent
1145 * back to the initiator.
1146 */
1147 enum {
1148 DELETE_SUCCESS = (1 << 0),
1149 DELETE_FAILURE = (1 << 1),
1150 DELETE_PARTIAL = (DELETE_FAILURE | DELETE_SUCCESS),
1151 };
1152
1153 static int usb_mtp_deletefn(MTPState *s, MTPObject *o, uint32_t trans)
1154 {
1155 MTPObject *iter, *iter2;
1156 int ret = 0;
1157
1158 /*
1159 * TODO: Add support for Protection Status
1160 */
1161
1162 QLIST_FOREACH(iter, &o->children, list) {
1163 if (iter->format == FMT_ASSOCIATION) {
1164 QLIST_FOREACH(iter2, &iter->children, list) {
1165 ret |= usb_mtp_deletefn(s, iter2, trans);
1166 }
1167 }
1168 }
1169
1170 if (o->format == FMT_UNDEFINED_OBJECT) {
1171 if (remove(o->path)) {
1172 ret |= DELETE_FAILURE;
1173 } else {
1174 usb_mtp_object_free(s, o);
1175 ret |= DELETE_SUCCESS;
1176 }
1177 } else if (o->format == FMT_ASSOCIATION) {
1178 if (rmdir(o->path)) {
1179 ret |= DELETE_FAILURE;
1180 } else {
1181 usb_mtp_object_free(s, o);
1182 ret |= DELETE_SUCCESS;
1183 }
1184 }
1185
1186 return ret;
1187 }
1188
1189 static void usb_mtp_object_delete(MTPState *s, uint32_t handle,
1190 uint32_t format_code, uint32_t trans)
1191 {
1192 MTPObject *o;
1193 int ret;
1194
1195 /* Return error if store is read-only */
1196 if (!FLAG_SET(s, MTP_FLAG_WRITABLE)) {
1197 usb_mtp_queue_result(s, RES_STORE_READ_ONLY,
1198 trans, 0, 0, 0, 0);
1199 return;
1200 }
1201
1202 if (format_code != 0) {
1203 usb_mtp_queue_result(s, RES_SPEC_BY_FORMAT_UNSUPPORTED,
1204 trans, 0, 0, 0, 0);
1205 return;
1206 }
1207
1208 if (handle == 0xFFFFFFF) {
1209 o = QTAILQ_FIRST(&s->objects);
1210 } else {
1211 o = usb_mtp_object_lookup(s, handle);
1212 }
1213 if (o == NULL) {
1214 usb_mtp_queue_result(s, RES_INVALID_OBJECT_HANDLE,
1215 trans, 0, 0, 0, 0);
1216 return;
1217 }
1218
1219 ret = usb_mtp_deletefn(s, o, trans);
1220 switch (ret) {
1221 case DELETE_SUCCESS:
1222 usb_mtp_queue_result(s, RES_OK, trans,
1223 0, 0, 0, 0);
1224 break;
1225 case DELETE_FAILURE:
1226 usb_mtp_queue_result(s, RES_PARTIAL_DELETE,
1227 trans, 0, 0, 0, 0);
1228 break;
1229 case DELETE_PARTIAL:
1230 usb_mtp_queue_result(s, RES_PARTIAL_DELETE,
1231 trans, 0, 0, 0, 0);
1232 break;
1233 default:
1234 g_assert_not_reached();
1235 }
1236 }
1237
1238 static void usb_mtp_command(MTPState *s, MTPControl *c)
1239 {
1240 MTPData *data_in = NULL;
1241 MTPObject *o = NULL;
1242 uint32_t nres = 0, res0 = 0;
1243 Error *err = NULL;
1244
1245 /* sanity checks */
1246 if (c->code >= CMD_CLOSE_SESSION && s->session == 0) {
1247 usb_mtp_queue_result(s, RES_SESSION_NOT_OPEN,
1248 c->trans, 0, 0, 0, 0);
1249 return;
1250 }
1251
1252 /* process commands */
1253 switch (c->code) {
1254 case CMD_GET_DEVICE_INFO:
1255 data_in = usb_mtp_get_device_info(s, c);
1256 break;
1257 case CMD_OPEN_SESSION:
1258 if (s->session) {
1259 usb_mtp_queue_result(s, RES_SESSION_ALREADY_OPEN,
1260 c->trans, 1, s->session, 0, 0);
1261 return;
1262 }
1263 if (c->argv[0] == 0) {
1264 usb_mtp_queue_result(s, RES_INVALID_PARAMETER,
1265 c->trans, 0, 0, 0, 0);
1266 return;
1267 }
1268 trace_usb_mtp_op_open_session(s->dev.addr);
1269 s->session = c->argv[0];
1270 usb_mtp_object_alloc(s, s->next_handle++, NULL, s->root);
1271
1272 s->file_monitor = qemu_file_monitor_new(&err);
1273 if (err) {
1274 error_reportf_err(err,
1275 "usb-mtp: file monitoring init failed: ");
1276 } else {
1277 QTAILQ_INIT(&s->events);
1278 }
1279 break;
1280 case CMD_CLOSE_SESSION:
1281 trace_usb_mtp_op_close_session(s->dev.addr);
1282 s->session = 0;
1283 s->next_handle = 0;
1284 usb_mtp_file_monitor_cleanup(s);
1285 usb_mtp_object_free(s, QTAILQ_FIRST(&s->objects));
1286 assert(QTAILQ_EMPTY(&s->objects));
1287 break;
1288 case CMD_GET_STORAGE_IDS:
1289 data_in = usb_mtp_get_storage_ids(s, c);
1290 break;
1291 case CMD_GET_STORAGE_INFO:
1292 if (c->argv[0] != QEMU_STORAGE_ID &&
1293 c->argv[0] != 0xffffffff) {
1294 usb_mtp_queue_result(s, RES_INVALID_STORAGE_ID,
1295 c->trans, 0, 0, 0, 0);
1296 return;
1297 }
1298 data_in = usb_mtp_get_storage_info(s, c);
1299 break;
1300 case CMD_GET_NUM_OBJECTS:
1301 case CMD_GET_OBJECT_HANDLES:
1302 if (c->argv[0] != QEMU_STORAGE_ID &&
1303 c->argv[0] != 0xffffffff) {
1304 usb_mtp_queue_result(s, RES_INVALID_STORAGE_ID,
1305 c->trans, 0, 0, 0, 0);
1306 return;
1307 }
1308 if (c->argv[1] != 0x00000000) {
1309 usb_mtp_queue_result(s, RES_SPEC_BY_FORMAT_UNSUPPORTED,
1310 c->trans, 0, 0, 0, 0);
1311 return;
1312 }
1313 if (c->argv[2] == 0x00000000 ||
1314 c->argv[2] == 0xffffffff) {
1315 o = QTAILQ_FIRST(&s->objects);
1316 } else {
1317 o = usb_mtp_object_lookup(s, c->argv[2]);
1318 }
1319 if (o == NULL) {
1320 usb_mtp_queue_result(s, RES_INVALID_OBJECT_HANDLE,
1321 c->trans, 0, 0, 0, 0);
1322 return;
1323 }
1324 if (o->format != FMT_ASSOCIATION) {
1325 usb_mtp_queue_result(s, RES_INVALID_PARENT_OBJECT,
1326 c->trans, 0, 0, 0, 0);
1327 return;
1328 }
1329 usb_mtp_object_readdir(s, o);
1330 if (c->code == CMD_GET_NUM_OBJECTS) {
1331 trace_usb_mtp_op_get_num_objects(s->dev.addr, o->handle, o->path);
1332 nres = 1;
1333 res0 = o->nchildren;
1334 } else {
1335 data_in = usb_mtp_get_object_handles(s, c, o);
1336 }
1337 break;
1338 case CMD_GET_OBJECT_INFO:
1339 o = usb_mtp_object_lookup(s, c->argv[0]);
1340 if (o == NULL) {
1341 usb_mtp_queue_result(s, RES_INVALID_OBJECT_HANDLE,
1342 c->trans, 0, 0, 0, 0);
1343 return;
1344 }
1345 data_in = usb_mtp_get_object_info(s, c, o);
1346 break;
1347 case CMD_GET_OBJECT:
1348 o = usb_mtp_object_lookup(s, c->argv[0]);
1349 if (o == NULL) {
1350 usb_mtp_queue_result(s, RES_INVALID_OBJECT_HANDLE,
1351 c->trans, 0, 0, 0, 0);
1352 return;
1353 }
1354 if (o->format == FMT_ASSOCIATION) {
1355 usb_mtp_queue_result(s, RES_INVALID_OBJECT_HANDLE,
1356 c->trans, 0, 0, 0, 0);
1357 return;
1358 }
1359 data_in = usb_mtp_get_object(s, c, o);
1360 if (data_in == NULL) {
1361 usb_mtp_queue_result(s, RES_GENERAL_ERROR,
1362 c->trans, 0, 0, 0, 0);
1363 return;
1364 }
1365 break;
1366 case CMD_DELETE_OBJECT:
1367 usb_mtp_object_delete(s, c->argv[0], c->argv[1], c->trans);
1368 return;
1369 case CMD_GET_PARTIAL_OBJECT:
1370 o = usb_mtp_object_lookup(s, c->argv[0]);
1371 if (o == NULL) {
1372 usb_mtp_queue_result(s, RES_INVALID_OBJECT_HANDLE,
1373 c->trans, 0, 0, 0, 0);
1374 return;
1375 }
1376 if (o->format == FMT_ASSOCIATION) {
1377 usb_mtp_queue_result(s, RES_INVALID_OBJECT_HANDLE,
1378 c->trans, 0, 0, 0, 0);
1379 return;
1380 }
1381 data_in = usb_mtp_get_partial_object(s, c, o);
1382 if (data_in == NULL) {
1383 usb_mtp_queue_result(s, RES_GENERAL_ERROR,
1384 c->trans, 0, 0, 0, 0);
1385 return;
1386 }
1387 nres = 1;
1388 res0 = data_in->length;
1389 break;
1390 case CMD_SEND_OBJECT_INFO:
1391 /* Return error if store is read-only */
1392 if (!FLAG_SET(s, MTP_FLAG_WRITABLE)) {
1393 usb_mtp_queue_result(s, RES_STORE_READ_ONLY,
1394 c->trans, 0, 0, 0, 0);
1395 } else if (c->argv[0] && (c->argv[0] != QEMU_STORAGE_ID)) {
1396 /* First parameter points to storage id or is 0 */
1397 usb_mtp_queue_result(s, RES_STORE_NOT_AVAILABLE, c->trans,
1398 0, 0, 0, 0);
1399 } else if (c->argv[1] && !c->argv[0]) {
1400 /* If second parameter is specified, first must also be specified */
1401 usb_mtp_queue_result(s, RES_DESTINATION_UNSUPPORTED, c->trans,
1402 0, 0, 0, 0);
1403 } else {
1404 uint32_t handle = c->argv[1];
1405 if (handle == 0xFFFFFFFF || handle == 0) {
1406 /* root object */
1407 o = QTAILQ_FIRST(&s->objects);
1408 } else {
1409 o = usb_mtp_object_lookup(s, handle);
1410 }
1411 if (o == NULL) {
1412 usb_mtp_queue_result(s, RES_INVALID_OBJECT_HANDLE, c->trans,
1413 0, 0, 0, 0);
1414 } else if (o->format != FMT_ASSOCIATION) {
1415 usb_mtp_queue_result(s, RES_INVALID_PARENT_OBJECT, c->trans,
1416 0, 0, 0, 0);
1417 }
1418 }
1419 if (o) {
1420 s->dataset.parent_handle = o->handle;
1421 }
1422 s->data_out = usb_mtp_data_alloc(c);
1423 return;
1424 case CMD_SEND_OBJECT:
1425 if (!FLAG_SET(s, MTP_FLAG_WRITABLE)) {
1426 usb_mtp_queue_result(s, RES_STORE_READ_ONLY,
1427 c->trans, 0, 0, 0, 0);
1428 return;
1429 }
1430 if (!s->write_pending) {
1431 usb_mtp_queue_result(s, RES_INVALID_OBJECTINFO,
1432 c->trans, 0, 0, 0, 0);
1433 return;
1434 }
1435 s->data_out = usb_mtp_data_alloc(c);
1436 return;
1437 case CMD_GET_OBJECT_PROPS_SUPPORTED:
1438 if (c->argv[0] != FMT_UNDEFINED_OBJECT &&
1439 c->argv[0] != FMT_ASSOCIATION) {
1440 usb_mtp_queue_result(s, RES_INVALID_OBJECT_FORMAT_CODE,
1441 c->trans, 0, 0, 0, 0);
1442 return;
1443 }
1444 data_in = usb_mtp_get_object_props_supported(s, c);
1445 break;
1446 case CMD_GET_OBJECT_PROP_DESC:
1447 if (c->argv[1] != FMT_UNDEFINED_OBJECT &&
1448 c->argv[1] != FMT_ASSOCIATION) {
1449 usb_mtp_queue_result(s, RES_INVALID_OBJECT_FORMAT_CODE,
1450 c->trans, 0, 0, 0, 0);
1451 return;
1452 }
1453 data_in = usb_mtp_get_object_prop_desc(s, c);
1454 if (data_in == NULL) {
1455 usb_mtp_queue_result(s, RES_INVALID_OBJECT_PROP_CODE,
1456 c->trans, 0, 0, 0, 0);
1457 return;
1458 }
1459 break;
1460 case CMD_GET_OBJECT_PROP_VALUE:
1461 o = usb_mtp_object_lookup(s, c->argv[0]);
1462 if (o == NULL) {
1463 usb_mtp_queue_result(s, RES_INVALID_OBJECT_HANDLE,
1464 c->trans, 0, 0, 0, 0);
1465 return;
1466 }
1467 data_in = usb_mtp_get_object_prop_value(s, c, o);
1468 if (data_in == NULL) {
1469 usb_mtp_queue_result(s, RES_INVALID_OBJECT_PROP_CODE,
1470 c->trans, 0, 0, 0, 0);
1471 return;
1472 }
1473 break;
1474 default:
1475 trace_usb_mtp_op_unknown(s->dev.addr, c->code);
1476 usb_mtp_queue_result(s, RES_OPERATION_NOT_SUPPORTED,
1477 c->trans, 0, 0, 0, 0);
1478 return;
1479 }
1480
1481 /* return results on success */
1482 if (data_in) {
1483 assert(s->data_in == NULL);
1484 s->data_in = data_in;
1485 }
1486 usb_mtp_queue_result(s, RES_OK, c->trans, nres, res0, 0, 0);
1487 }
1488
1489 /* ----------------------------------------------------------------------- */
1490
1491 static void usb_mtp_handle_reset(USBDevice *dev)
1492 {
1493 MTPState *s = USB_MTP(dev);
1494
1495 trace_usb_mtp_reset(s->dev.addr);
1496
1497 usb_mtp_file_monitor_cleanup(s);
1498 usb_mtp_object_free(s, QTAILQ_FIRST(&s->objects));
1499 s->session = 0;
1500 usb_mtp_data_free(s->data_in);
1501 s->data_in = NULL;
1502 usb_mtp_data_free(s->data_out);
1503 s->data_out = NULL;
1504 g_free(s->result);
1505 s->result = NULL;
1506 }
1507
1508 static void usb_mtp_handle_control(USBDevice *dev, USBPacket *p,
1509 int request, int value, int index,
1510 int length, uint8_t *data)
1511 {
1512 int ret;
1513 MTPState *s = USB_MTP(dev);
1514 uint16_t *event = (uint16_t *)data;
1515
1516 switch (request) {
1517 case ClassInterfaceOutRequest | 0x64:
1518 if (*event == EVT_CANCEL_TRANSACTION) {
1519 g_free(s->result);
1520 s->result = NULL;
1521 usb_mtp_data_free(s->data_in);
1522 s->data_in = NULL;
1523 if (s->write_pending) {
1524 g_free(s->dataset.filename);
1525 s->write_pending = false;
1526 s->dataset.size = 0;
1527 }
1528 usb_mtp_data_free(s->data_out);
1529 s->data_out = NULL;
1530 } else {
1531 p->status = USB_RET_STALL;
1532 }
1533 break;
1534 default:
1535 ret = usb_desc_handle_control(dev, p, request,
1536 value, index, length, data);
1537 if (ret >= 0) {
1538 return;
1539 }
1540 }
1541
1542 trace_usb_mtp_stall(dev->addr, "unknown control request");
1543 }
1544
1545 static void usb_mtp_cancel_packet(USBDevice *dev, USBPacket *p)
1546 {
1547 /* we don't use async packets, so this should never be called */
1548 fprintf(stderr, "%s\n", __func__);
1549 }
1550
1551 static char *utf16_to_str(uint8_t len, uint8_t *str16)
1552 {
1553 wchar_t *wstr = g_new0(wchar_t, len + 1);
1554 int count, dlen;
1555 char *dest;
1556
1557 for (count = 0; count < len; count++) {
1558 /* FIXME: not working for surrogate pairs */
1559 wstr[count] = lduw_le_p(str16 + (count * 2));
1560 }
1561 wstr[count] = 0;
1562
1563 dlen = wcstombs(NULL, wstr, 0) + 1;
1564 dest = g_malloc(dlen);
1565 wcstombs(dest, wstr, dlen);
1566 g_free(wstr);
1567 return dest;
1568 }
1569
1570 /* Wrapper around write, returns 0 on failure */
1571 static uint64_t write_retry(int fd, void *buf, uint64_t size, off_t offset)
1572 {
1573 uint64_t ret = 0;
1574
1575 if (lseek(fd, offset, SEEK_SET) < 0) {
1576 goto done;
1577 }
1578
1579 ret = qemu_write_full(fd, buf, size);
1580
1581 done:
1582 return ret;
1583 }
1584
1585 static int usb_mtp_update_object(MTPObject *parent, char *name)
1586 {
1587 int ret = 0;
1588
1589 MTPObject *o =
1590 usb_mtp_object_lookup_name(parent, name, strlen(name));
1591
1592 if (o) {
1593 ret = lstat(o->path, &o->stat);
1594 }
1595
1596 return ret;
1597 }
1598
1599 static void usb_mtp_write_data(MTPState *s, uint32_t handle)
1600 {
1601 MTPData *d = s->data_out;
1602 MTPObject *parent =
1603 usb_mtp_object_lookup(s, s->dataset.parent_handle);
1604 char *path = NULL;
1605 uint64_t rc;
1606 mode_t mask = 0755;
1607 int ret = 0;
1608
1609 assert(d != NULL);
1610
1611 switch (d->write_status) {
1612 case WRITE_START:
1613 if (!parent || !s->write_pending) {
1614 usb_mtp_queue_result(s, RES_INVALID_OBJECTINFO, d->trans,
1615 0, 0, 0, 0);
1616 return;
1617 }
1618
1619 if (s->dataset.filename) {
1620 path = g_strdup_printf("%s/%s", parent->path, s->dataset.filename);
1621 if (s->dataset.format == FMT_ASSOCIATION) {
1622 ret = g_mkdir(path, mask);
1623 if (!ret) {
1624 usb_mtp_queue_result(s, RES_OK, d->trans, 3,
1625 QEMU_STORAGE_ID,
1626 s->dataset.parent_handle,
1627 handle);
1628 goto close;
1629 }
1630 goto done;
1631 }
1632
1633 d->fd = open(path, O_CREAT | O_WRONLY |
1634 O_CLOEXEC | O_NOFOLLOW, mask & 0666);
1635 if (d->fd == -1) {
1636 ret = 1;
1637 goto done;
1638 }
1639
1640 /* Return success if initiator sent 0 sized data */
1641 if (!s->dataset.size) {
1642 goto done;
1643 }
1644 if (d->length != MTP_WRITE_BUF_SZ && !d->pending) {
1645 d->write_status = WRITE_END;
1646 }
1647 }
1648 /* fall through */
1649 case WRITE_CONTINUE:
1650 case WRITE_END:
1651 rc = write_retry(d->fd, d->data, d->data_offset,
1652 d->offset - d->data_offset);
1653 if (rc != d->data_offset) {
1654 ret = 1;
1655 goto done;
1656 }
1657 if (d->write_status != WRITE_END) {
1658 g_free(path);
1659 return;
1660 } else {
1661 /*
1662 * Return an incomplete transfer if file size doesn't match
1663 * for < 4G file or if lstat fails which will result in an incorrect
1664 * file size
1665 */
1666 if ((s->dataset.size != 0xFFFFFFFF &&
1667 d->offset != s->dataset.size) ||
1668 usb_mtp_update_object(parent, s->dataset.filename)) {
1669 usb_mtp_queue_result(s, RES_INCOMPLETE_TRANSFER, d->trans,
1670 0, 0, 0, 0);
1671 goto close;
1672 }
1673 }
1674 }
1675
1676 done:
1677 if (ret) {
1678 usb_mtp_queue_result(s, RES_STORE_FULL, d->trans,
1679 0, 0, 0, 0);
1680 } else {
1681 usb_mtp_queue_result(s, RES_OK, d->trans,
1682 0, 0, 0, 0);
1683 }
1684 close:
1685 /*
1686 * The write dataset is kept around and freed only
1687 * on success or if another write request comes in
1688 */
1689 if (d->fd != -1) {
1690 close(d->fd);
1691 d->fd = -1;
1692 }
1693 g_free(s->dataset.filename);
1694 s->dataset.size = 0;
1695 g_free(path);
1696 s->write_pending = false;
1697 }
1698
1699 static void usb_mtp_write_metadata(MTPState *s, uint64_t dlen)
1700 {
1701 MTPData *d = s->data_out;
1702 ObjectInfo *dataset = (ObjectInfo *)d->data;
1703 char *filename;
1704 MTPObject *o;
1705 MTPObject *p = usb_mtp_object_lookup(s, s->dataset.parent_handle);
1706 uint32_t next_handle = s->next_handle;
1707 size_t filename_chars = dlen - offsetof(ObjectInfo, filename);
1708
1709 /*
1710 * filename is utf-16. We're intentionally doing
1711 * integer division to truncate if malicious guest
1712 * sent an odd number of bytes.
1713 */
1714 filename_chars /= 2;
1715
1716 assert(!s->write_pending);
1717 assert(p != NULL);
1718
1719 filename = utf16_to_str(MIN(dataset->length, filename_chars),
1720 dataset->filename);
1721
1722 if (strchr(filename, '/')) {
1723 usb_mtp_queue_result(s, RES_PARAMETER_NOT_SUPPORTED, d->trans,
1724 0, 0, 0, 0);
1725 g_free(filename);
1726 return;
1727 }
1728
1729 o = usb_mtp_object_lookup_name(p, filename, -1);
1730 if (o != NULL) {
1731 next_handle = o->handle;
1732 }
1733
1734 s->dataset.filename = filename;
1735 s->dataset.format = dataset->format;
1736 s->dataset.size = dataset->size;
1737 s->write_pending = true;
1738
1739 if (s->dataset.format == FMT_ASSOCIATION) {
1740 usb_mtp_write_data(s, next_handle);
1741 } else {
1742 usb_mtp_queue_result(s, RES_OK, d->trans, 3, QEMU_STORAGE_ID,
1743 s->dataset.parent_handle, next_handle);
1744 }
1745 }
1746
1747 static void usb_mtp_get_data(MTPState *s, mtp_container *container,
1748 USBPacket *p)
1749 {
1750 MTPData *d = s->data_out;
1751 uint64_t dlen;
1752 uint32_t data_len = p->iov.size;
1753 uint64_t total_len;
1754
1755 if (!d) {
1756 usb_mtp_queue_result(s, RES_INVALID_OBJECTINFO, 0,
1757 0, 0, 0, 0);
1758 return;
1759 }
1760 if (d->first) {
1761 /* Total length of incoming data */
1762 total_len = cpu_to_le32(container->length) - sizeof(mtp_container);
1763 /* Length of data in this packet */
1764 data_len -= sizeof(mtp_container);
1765 if (total_len < MTP_WRITE_BUF_SZ) {
1766 usb_mtp_realloc(d, total_len);
1767 d->length += total_len;
1768 } else {
1769 usb_mtp_realloc(d, MTP_WRITE_BUF_SZ - sizeof(mtp_container));
1770 d->length += MTP_WRITE_BUF_SZ - sizeof(mtp_container);
1771 }
1772 d->offset = 0;
1773 d->first = false;
1774 d->pending = false;
1775 d->data_offset = 0;
1776 d->write_status = WRITE_START;
1777 }
1778
1779 if (d->pending) {
1780 memset(d->data, 0, d->length);
1781 if (d->length != MTP_WRITE_BUF_SZ) {
1782 usb_mtp_realloc(d, MTP_WRITE_BUF_SZ - d->length);
1783 d->length += (MTP_WRITE_BUF_SZ - d->length);
1784 }
1785 d->pending = false;
1786 d->write_status = WRITE_CONTINUE;
1787 d->data_offset = 0;
1788 }
1789
1790 if (d->length - d->data_offset > data_len) {
1791 dlen = data_len;
1792 } else {
1793 dlen = d->length - d->data_offset;
1794 }
1795
1796 switch (d->code) {
1797 case CMD_SEND_OBJECT_INFO:
1798 usb_packet_copy(p, d->data + d->data_offset, dlen);
1799 d->offset += dlen;
1800 d->data_offset += dlen;
1801 if (d->data_offset == d->length) {
1802 /* The operation might have already failed */
1803 if (!s->result) {
1804 usb_mtp_write_metadata(s, dlen);
1805 }
1806 usb_mtp_data_free(s->data_out);
1807 s->data_out = NULL;
1808 return;
1809 }
1810 break;
1811 case CMD_SEND_OBJECT:
1812 usb_packet_copy(p, d->data + d->data_offset, dlen);
1813 d->offset += dlen;
1814 d->data_offset += dlen;
1815 if ((p->iov.size % 64) || !p->iov.size) {
1816 assert((s->dataset.size == 0xFFFFFFFF) ||
1817 (s->dataset.size == d->offset));
1818
1819 if (d->length == MTP_WRITE_BUF_SZ) {
1820 d->write_status = WRITE_END;
1821 } else {
1822 d->write_status = WRITE_START;
1823 }
1824 usb_mtp_write_data(s, 0);
1825 usb_mtp_data_free(s->data_out);
1826 s->data_out = NULL;
1827 return;
1828 }
1829 if (d->data_offset == d->length) {
1830 d->pending = true;
1831 usb_mtp_write_data(s, 0);
1832 }
1833 break;
1834 default:
1835 p->status = USB_RET_STALL;
1836 return;
1837 }
1838 }
1839
1840 static void usb_mtp_handle_data(USBDevice *dev, USBPacket *p)
1841 {
1842 MTPState *s = USB_MTP(dev);
1843 MTPControl cmd;
1844 mtp_container container;
1845 uint32_t params[5];
1846 uint16_t container_type;
1847 int i, rc;
1848
1849 switch (p->ep->nr) {
1850 case EP_DATA_IN:
1851 if (s->data_out != NULL) {
1852 /* guest bug */
1853 trace_usb_mtp_stall(s->dev.addr, "awaiting data-out");
1854 p->status = USB_RET_STALL;
1855 return;
1856 }
1857 if (p->iov.size < sizeof(container)) {
1858 trace_usb_mtp_stall(s->dev.addr, "packet too small");
1859 p->status = USB_RET_STALL;
1860 return;
1861 }
1862 if (s->data_in != NULL) {
1863 MTPData *d = s->data_in;
1864 uint64_t dlen = d->length - d->offset;
1865 if (d->first) {
1866 trace_usb_mtp_data_in(s->dev.addr, d->trans, d->length);
1867 if (d->length + sizeof(container) > 0xFFFFFFFF) {
1868 container.length = cpu_to_le32(0xFFFFFFFF);
1869 } else {
1870 container.length =
1871 cpu_to_le32(d->length + sizeof(container));
1872 }
1873 container.type = cpu_to_le16(TYPE_DATA);
1874 container.code = cpu_to_le16(d->code);
1875 container.trans = cpu_to_le32(d->trans);
1876 usb_packet_copy(p, &container, sizeof(container));
1877 d->first = false;
1878 if (dlen > p->iov.size - sizeof(container)) {
1879 dlen = p->iov.size - sizeof(container);
1880 }
1881 } else {
1882 if (dlen > p->iov.size) {
1883 dlen = p->iov.size;
1884 }
1885 }
1886 if (d->fd == -1) {
1887 usb_packet_copy(p, d->data + d->offset, dlen);
1888 } else {
1889 if (d->alloc < p->iov.size) {
1890 d->alloc = p->iov.size;
1891 d->data = g_realloc(d->data, d->alloc);
1892 }
1893 rc = read(d->fd, d->data, dlen);
1894 if (rc != dlen) {
1895 memset(d->data, 0, dlen);
1896 s->result->code = RES_INCOMPLETE_TRANSFER;
1897 }
1898 usb_packet_copy(p, d->data, dlen);
1899 }
1900 d->offset += dlen;
1901 if (d->offset == d->length) {
1902 usb_mtp_data_free(s->data_in);
1903 s->data_in = NULL;
1904 }
1905 } else if (s->result != NULL) {
1906 MTPControl *r = s->result;
1907 int length = sizeof(container) + r->argc * sizeof(uint32_t);
1908 if (r->code == RES_OK) {
1909 trace_usb_mtp_success(s->dev.addr, r->trans,
1910 (r->argc > 0) ? r->argv[0] : 0,
1911 (r->argc > 1) ? r->argv[1] : 0);
1912 } else {
1913 trace_usb_mtp_error(s->dev.addr, r->code, r->trans,
1914 (r->argc > 0) ? r->argv[0] : 0,
1915 (r->argc > 1) ? r->argv[1] : 0);
1916 }
1917 container.length = cpu_to_le32(length);
1918 container.type = cpu_to_le16(TYPE_RESPONSE);
1919 container.code = cpu_to_le16(r->code);
1920 container.trans = cpu_to_le32(r->trans);
1921 for (i = 0; i < r->argc; i++) {
1922 params[i] = cpu_to_le32(r->argv[i]);
1923 }
1924 usb_packet_copy(p, &container, sizeof(container));
1925 usb_packet_copy(p, &params, length - sizeof(container));
1926 g_free(s->result);
1927 s->result = NULL;
1928 }
1929 break;
1930 case EP_DATA_OUT:
1931 if (p->iov.size < sizeof(container)) {
1932 trace_usb_mtp_stall(s->dev.addr, "packet too small");
1933 p->status = USB_RET_STALL;
1934 return;
1935 }
1936 if ((s->data_out != NULL) && !s->data_out->first) {
1937 container_type = TYPE_DATA;
1938 } else {
1939 usb_packet_copy(p, &container, sizeof(container));
1940 container_type = le16_to_cpu(container.type);
1941 }
1942 switch (container_type) {
1943 case TYPE_COMMAND:
1944 if (s->data_in || s->data_out || s->result) {
1945 trace_usb_mtp_stall(s->dev.addr, "transaction inflight");
1946 p->status = USB_RET_STALL;
1947 return;
1948 }
1949 cmd.code = le16_to_cpu(container.code);
1950 cmd.argc = (le32_to_cpu(container.length) - sizeof(container))
1951 / sizeof(uint32_t);
1952 cmd.trans = le32_to_cpu(container.trans);
1953 if (cmd.argc > ARRAY_SIZE(cmd.argv)) {
1954 cmd.argc = ARRAY_SIZE(cmd.argv);
1955 }
1956 if (p->iov.size < sizeof(container) + cmd.argc * sizeof(uint32_t)) {
1957 trace_usb_mtp_stall(s->dev.addr, "packet too small");
1958 p->status = USB_RET_STALL;
1959 return;
1960 }
1961 usb_packet_copy(p, &params, cmd.argc * sizeof(uint32_t));
1962 for (i = 0; i < cmd.argc; i++) {
1963 cmd.argv[i] = le32_to_cpu(params[i]);
1964 }
1965 trace_usb_mtp_command(s->dev.addr, cmd.code, cmd.trans,
1966 (cmd.argc > 0) ? cmd.argv[0] : 0,
1967 (cmd.argc > 1) ? cmd.argv[1] : 0,
1968 (cmd.argc > 2) ? cmd.argv[2] : 0,
1969 (cmd.argc > 3) ? cmd.argv[3] : 0,
1970 (cmd.argc > 4) ? cmd.argv[4] : 0);
1971 usb_mtp_command(s, &cmd);
1972 break;
1973 case TYPE_DATA:
1974 /* One of the previous transfers has already errored but the
1975 * responder is still sending data associated with it
1976 */
1977 if (s->result != NULL) {
1978 return;
1979 }
1980 usb_mtp_get_data(s, &container, p);
1981 break;
1982 default:
1983 /* not needed as long as the mtp device is read-only */
1984 p->status = USB_RET_STALL;
1985 return;
1986 }
1987 break;
1988 case EP_EVENT:
1989 if (!QTAILQ_EMPTY(&s->events)) {
1990 struct MTPMonEntry *e = QTAILQ_LAST(&s->events);
1991 uint32_t handle;
1992 int len = sizeof(container) + sizeof(uint32_t);
1993
1994 if (p->iov.size < len) {
1995 trace_usb_mtp_stall(s->dev.addr,
1996 "packet too small to send event");
1997 p->status = USB_RET_STALL;
1998 return;
1999 }
2000
2001 QTAILQ_REMOVE(&s->events, e, next);
2002 container.length = cpu_to_le32(len);
2003 container.type = cpu_to_le32(TYPE_EVENT);
2004 container.code = cpu_to_le16(e->event);
2005 container.trans = 0; /* no trans specific events */
2006 handle = cpu_to_le32(e->handle);
2007 usb_packet_copy(p, &container, sizeof(container));
2008 usb_packet_copy(p, &handle, sizeof(uint32_t));
2009 g_free(e);
2010 return;
2011 }
2012 p->status = USB_RET_NAK;
2013 return;
2014 default:
2015 trace_usb_mtp_stall(s->dev.addr, "invalid endpoint");
2016 p->status = USB_RET_STALL;
2017 return;
2018 }
2019
2020 if (p->actual_length == 0) {
2021 trace_usb_mtp_nak(s->dev.addr, p->ep->nr);
2022 p->status = USB_RET_NAK;
2023 return;
2024 } else {
2025 trace_usb_mtp_xfer(s->dev.addr, p->ep->nr, p->actual_length,
2026 p->iov.size);
2027 return;
2028 }
2029 }
2030
2031 static void usb_mtp_realize(USBDevice *dev, Error **errp)
2032 {
2033 MTPState *s = USB_MTP(dev);
2034
2035 if ((s->root == NULL) || !g_path_is_absolute(s->root)) {
2036 error_setg(errp, "usb-mtp: rootdir must be configured and be an absolute path");
2037 return;
2038 }
2039
2040 if (access(s->root, R_OK) != 0) {
2041 error_setg(errp, "usb-mtp: rootdir does not exist/not readable");
2042 return;
2043 } else if (!s->readonly && access(s->root, W_OK) != 0) {
2044 error_setg(errp, "usb-mtp: rootdir does not have write permissions");
2045 return;
2046 }
2047
2048 /* Mark store as RW */
2049 if (!s->readonly) {
2050 s->flags |= (1 << MTP_FLAG_WRITABLE);
2051 }
2052
2053 if (s->desc == NULL) {
2054 /*
2055 * This does not check if path exists
2056 * but we have the checks above
2057 */
2058 s->desc = g_path_get_basename(s->root);
2059 }
2060
2061 usb_desc_create_serial(dev);
2062 usb_desc_init(dev);
2063 QTAILQ_INIT(&s->objects);
2064
2065 }
2066
2067 static const VMStateDescription vmstate_usb_mtp = {
2068 .name = "usb-mtp",
2069 .unmigratable = 1,
2070 .version_id = 1,
2071 .minimum_version_id = 1,
2072 .fields = (const VMStateField[]) {
2073 VMSTATE_USB_DEVICE(dev, MTPState),
2074 VMSTATE_END_OF_LIST()
2075 }
2076 };
2077
2078 static const Property mtp_properties[] = {
2079 DEFINE_PROP_STRING("rootdir", MTPState, root),
2080 DEFINE_PROP_STRING("desc", MTPState, desc),
2081 DEFINE_PROP_BOOL("readonly", MTPState, readonly, true),
2082 };
2083
2084 static void usb_mtp_class_initfn(ObjectClass *klass, const void *data)
2085 {
2086 DeviceClass *dc = DEVICE_CLASS(klass);
2087 USBDeviceClass *uc = USB_DEVICE_CLASS(klass);
2088
2089 uc->realize = usb_mtp_realize;
2090 uc->product_desc = "QEMU USB MTP";
2091 uc->usb_desc = &desc;
2092 uc->cancel_packet = usb_mtp_cancel_packet;
2093 uc->handle_attach = usb_desc_attach;
2094 uc->handle_reset = usb_mtp_handle_reset;
2095 uc->handle_control = usb_mtp_handle_control;
2096 uc->handle_data = usb_mtp_handle_data;
2097 set_bit(DEVICE_CATEGORY_STORAGE, dc->categories);
2098 dc->desc = "USB Media Transfer Protocol device";
2099 dc->fw_name = "mtp";
2100 dc->vmsd = &vmstate_usb_mtp;
2101 device_class_set_props(dc, mtp_properties);
2102 }
2103
2104 static const TypeInfo mtp_info = {
2105 .name = TYPE_USB_MTP,
2106 .parent = TYPE_USB_DEVICE,
2107 .instance_size = sizeof(MTPState),
2108 .class_init = usb_mtp_class_initfn,
2109 };
2110
2111 static void usb_mtp_register_types(void)
2112 {
2113 type_register_static(&mtp_info);
2114 }
2115
2116 type_init(usb_mtp_register_types)