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/qdev-properties.h"
26 #include "hw/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 MTPState MTPState;
127 typedef struct MTPControl MTPControl;
128 typedef struct MTPData MTPData;
129 typedef struct MTPObject MTPObject;
130
131 enum {
132 EP_DATA_IN = 1,
133 EP_DATA_OUT,
134 EP_EVENT,
135 };
136
137 typedef struct MTPMonEntry MTPMonEntry;
138
139 struct MTPMonEntry {
140 uint32_t event;
141 uint32_t handle;
142
143 QTAILQ_ENTRY(MTPMonEntry) next;
144 };
145
146 struct MTPControl {
147 uint16_t code;
148 uint32_t trans;
149 int argc;
150 uint32_t argv[5];
151 };
152
153 struct MTPData {
154 uint16_t code;
155 uint32_t trans;
156 uint64_t offset;
157 uint64_t length;
158 uint64_t alloc;
159 uint8_t *data;
160 bool first;
161 /* Used for >4G file sizes */
162 bool pending;
163 int fd;
164 uint8_t write_status;
165 /* Internal pointer per every MTP_WRITE_BUF_SZ */
166 uint64_t data_offset;
167 };
168
169 struct MTPObject {
170 uint32_t handle;
171 uint16_t format;
172 char *name;
173 char *path;
174 struct stat stat;
175 /* file monitor watch id */
176 int64_t watchid;
177 MTPObject *parent;
178 uint32_t nchildren;
179 QLIST_HEAD(, MTPObject) children;
180 QLIST_ENTRY(MTPObject) list;
181 bool have_children;
182 QTAILQ_ENTRY(MTPObject) next;
183 };
184
185 struct MTPState {
186 USBDevice dev;
187 char *root;
188 char *desc;
189 uint32_t flags;
190
191 MTPData *data_in;
192 MTPData *data_out;
193 MTPControl *result;
194 uint32_t session;
195 uint32_t next_handle;
196 bool readonly;
197
198 QTAILQ_HEAD(, MTPObject) objects;
199 QFileMonitor *file_monitor;
200 QTAILQ_HEAD(, MTPMonEntry) events;
201 /* Responder is expecting a write operation */
202 bool write_pending;
203 struct {
204 uint32_t parent_handle;
205 uint16_t format;
206 uint32_t size;
207 char *filename;
208 } dataset;
209 };
210
211 /*
212 * ObjectInfo dataset received from initiator
213 * Fields we don't care about are ignored
214 */
215 typedef struct {
216 uint32_t storage_id; /*unused*/
217 uint16_t format;
218 uint16_t protection_status; /*unused*/
219 uint32_t size;
220 uint16_t thumb_format; /*unused*/
221 uint32_t thumb_comp_sz; /*unused*/
222 uint32_t thumb_pix_width; /*unused*/
223 uint32_t thumb_pix_height; /*unused*/
224 uint32_t image_pix_width; /*unused*/
225 uint32_t image_pix_height; /*unused*/
226 uint32_t image_bit_depth; /*unused*/
227 uint32_t parent; /*unused*/
228 uint16_t assoc_type;
229 uint32_t assoc_desc;
230 uint32_t seq_no; /*unused*/
231 uint8_t length; /*part of filename field*/
232 uint8_t filename[0]; /* UTF-16 encoded */
233 char date_created[0]; /*unused*/
234 char date_modified[0]; /*unused*/
235 char keywords[0]; /*unused*/
236 /* string and other data follows */
237 } QEMU_PACKED ObjectInfo;
238
239 #define TYPE_USB_MTP "usb-mtp"
240 OBJECT_DECLARE_SIMPLE_TYPE(MTPState, USB_MTP)
241
242 #define QEMU_STORAGE_ID 0x00010001
243
244 #define MTP_FLAG_WRITABLE 0
245
246 #define FLAG_SET(_mtp, _flag) ((_mtp)->flags & (1 << (_flag)))
247
248 /* ----------------------------------------------------------------------- */
249
250 #define MTP_MANUFACTURER "QEMU"
251 #define MTP_PRODUCT "QEMU filesharing"
252 #define MTP_WRITE_BUF_SZ (512 * KiB)
253
254 enum {
255 STR_MANUFACTURER = 1,
256 STR_PRODUCT,
257 STR_SERIALNUMBER,
258 STR_MTP,
259 STR_CONFIG_FULL,
260 STR_CONFIG_HIGH,
261 STR_CONFIG_SUPER,
262 };
263
264 static const USBDescStrings desc_strings = {
265 [STR_MANUFACTURER] = MTP_MANUFACTURER,
266 [STR_PRODUCT] = MTP_PRODUCT,
267 [STR_SERIALNUMBER] = "34617",
268 [STR_MTP] = "MTP",
269 [STR_CONFIG_FULL] = "Full speed config (usb 1.1)",
270 [STR_CONFIG_HIGH] = "High speed config (usb 2.0)",
271 [STR_CONFIG_SUPER] = "Super speed config (usb 3.0)",
272 };
273
274 static const USBDescIface desc_iface_full = {
275 .bInterfaceNumber = 0,
276 .bNumEndpoints = 3,
277 .bInterfaceClass = USB_CLASS_STILL_IMAGE,
278 .bInterfaceSubClass = 0x01,
279 .bInterfaceProtocol = 0x01,
280 .iInterface = STR_MTP,
281 .eps = (USBDescEndpoint[]) {
282 {
283 .bEndpointAddress = USB_DIR_IN | EP_DATA_IN,
284 .bmAttributes = USB_ENDPOINT_XFER_BULK,
285 .wMaxPacketSize = 64,
286 },{
287 .bEndpointAddress = USB_DIR_OUT | EP_DATA_OUT,
288 .bmAttributes = USB_ENDPOINT_XFER_BULK,
289 .wMaxPacketSize = 64,
290 },{
291 .bEndpointAddress = USB_DIR_IN | EP_EVENT,
292 .bmAttributes = USB_ENDPOINT_XFER_INT,
293 .wMaxPacketSize = 64,
294 .bInterval = 0x0a,
295 },
296 }
297 };
298
299 static const USBDescDevice desc_device_full = {
300 .bcdUSB = 0x0200,
301 .bMaxPacketSize0 = 8,
302 .bNumConfigurations = 1,
303 .confs = (USBDescConfig[]) {
304 {
305 .bNumInterfaces = 1,
306 .bConfigurationValue = 1,
307 .iConfiguration = STR_CONFIG_FULL,
308 .bmAttributes = USB_CFG_ATT_ONE | USB_CFG_ATT_WAKEUP,
309 .bMaxPower = 2,
310 .nif = 1,
311 .ifs = &desc_iface_full,
312 },
313 },
314 };
315
316 static const USBDescIface desc_iface_high = {
317 .bInterfaceNumber = 0,
318 .bNumEndpoints = 3,
319 .bInterfaceClass = USB_CLASS_STILL_IMAGE,
320 .bInterfaceSubClass = 0x01,
321 .bInterfaceProtocol = 0x01,
322 .iInterface = STR_MTP,
323 .eps = (USBDescEndpoint[]) {
324 {
325 .bEndpointAddress = USB_DIR_IN | EP_DATA_IN,
326 .bmAttributes = USB_ENDPOINT_XFER_BULK,
327 .wMaxPacketSize = 512,
328 },{
329 .bEndpointAddress = USB_DIR_OUT | EP_DATA_OUT,
330 .bmAttributes = USB_ENDPOINT_XFER_BULK,
331 .wMaxPacketSize = 512,
332 },{
333 .bEndpointAddress = USB_DIR_IN | EP_EVENT,
334 .bmAttributes = USB_ENDPOINT_XFER_INT,
335 .wMaxPacketSize = 64,
336 .bInterval = 0x0a,
337 },
338 }
339 };
340
341 static const USBDescDevice desc_device_high = {
342 .bcdUSB = 0x0200,
343 .bMaxPacketSize0 = 64,
344 .bNumConfigurations = 1,
345 .confs = (USBDescConfig[]) {
346 {
347 .bNumInterfaces = 1,
348 .bConfigurationValue = 1,
349 .iConfiguration = STR_CONFIG_HIGH,
350 .bmAttributes = USB_CFG_ATT_ONE | USB_CFG_ATT_WAKEUP,
351 .bMaxPower = 2,
352 .nif = 1,
353 .ifs = &desc_iface_high,
354 },
355 },
356 };
357
358 static const USBDescMSOS desc_msos = {
359 .CompatibleID = "MTP",
360 .SelectiveSuspendEnabled = true,
361 };
362
363 static const USBDesc desc = {
364 .id = {
365 .idVendor = 0x46f4, /* CRC16() of "QEMU" */
366 .idProduct = 0x0004,
367 .bcdDevice = 0,
368 .iManufacturer = STR_MANUFACTURER,
369 .iProduct = STR_PRODUCT,
370 .iSerialNumber = STR_SERIALNUMBER,
371 },
372 .full = &desc_device_full,
373 .high = &desc_device_high,
374 .str = desc_strings,
375 .msos = &desc_msos,
376 };
377
378 /* ----------------------------------------------------------------------- */
379
usb_mtp_object_alloc(MTPState * s,uint32_t handle,MTPObject * parent,const char * name)380 static MTPObject *usb_mtp_object_alloc(MTPState *s, uint32_t handle,
381 MTPObject *parent, const char *name)
382 {
383 MTPObject *o = g_new0(MTPObject, 1);
384
385 if (name[0] == '.') {
386 goto ignore;
387 }
388
389 o->watchid = -1;
390 o->handle = handle;
391 o->parent = parent;
392 o->name = g_strdup(name);
393 if (parent == NULL) {
394 o->path = g_strdup(name);
395 } else {
396 o->path = g_strdup_printf("%s/%s", parent->path, name);
397 }
398
399 if (lstat(o->path, &o->stat) != 0) {
400 goto ignore;
401 }
402 if (S_ISREG(o->stat.st_mode)) {
403 o->format = FMT_UNDEFINED_OBJECT;
404 } else if (S_ISDIR(o->stat.st_mode)) {
405 o->format = FMT_ASSOCIATION;
406 } else {
407 goto ignore;
408 }
409
410 if (access(o->path, R_OK) != 0) {
411 goto ignore;
412 }
413
414 trace_usb_mtp_object_alloc(s->dev.addr, o->handle, o->path);
415
416 QTAILQ_INSERT_TAIL(&s->objects, o, next);
417 return o;
418
419 ignore:
420 g_free(o->name);
421 g_free(o->path);
422 g_free(o);
423 return NULL;
424 }
425
usb_mtp_object_free(MTPState * s,MTPObject * o)426 static void usb_mtp_object_free(MTPState *s, MTPObject *o)
427 {
428 MTPObject *iter;
429
430 if (!o) {
431 return;
432 }
433
434 trace_usb_mtp_object_free(s->dev.addr, o->handle, o->path);
435
436 if (o->watchid != -1 && s->file_monitor) {
437 qemu_file_monitor_remove_watch(s->file_monitor, o->path, o->watchid);
438 }
439
440 QTAILQ_REMOVE(&s->objects, o, next);
441 if (o->parent) {
442 QLIST_REMOVE(o, list);
443 o->parent->nchildren--;
444 }
445
446 while (!QLIST_EMPTY(&o->children)) {
447 iter = QLIST_FIRST(&o->children);
448 usb_mtp_object_free(s, iter);
449 }
450 g_free(o->name);
451 g_free(o->path);
452 g_free(o);
453 }
454
usb_mtp_object_lookup(MTPState * s,uint32_t handle)455 static MTPObject *usb_mtp_object_lookup(MTPState *s, uint32_t handle)
456 {
457 MTPObject *o;
458
459 QTAILQ_FOREACH(o, &s->objects, next) {
460 if (o->handle == handle) {
461 return o;
462 }
463 }
464 return NULL;
465 }
466
usb_mtp_add_child(MTPState * s,MTPObject * o,const char * name)467 static MTPObject *usb_mtp_add_child(MTPState *s, MTPObject *o,
468 const char *name)
469 {
470 MTPObject *child =
471 usb_mtp_object_alloc(s, s->next_handle++, o, name);
472
473 if (child) {
474 trace_usb_mtp_add_child(s->dev.addr, child->handle, child->path);
475 QLIST_INSERT_HEAD(&o->children, child, list);
476 o->nchildren++;
477
478 if (child->format == FMT_ASSOCIATION) {
479 QLIST_INIT(&child->children);
480 }
481 }
482
483 return child;
484 }
485
usb_mtp_object_lookup_name(MTPObject * parent,const char * name,int len)486 static MTPObject *usb_mtp_object_lookup_name(MTPObject *parent,
487 const char *name, int len)
488 {
489 MTPObject *iter;
490
491 if (len == -1) {
492 len = strlen(name);
493 }
494
495 QLIST_FOREACH(iter, &parent->children, list) {
496 if (strncmp(iter->name, name, len) == 0) {
497 return iter;
498 }
499 }
500
501 return NULL;
502 }
503
usb_mtp_object_lookup_id(MTPState * s,int64_t id)504 static MTPObject *usb_mtp_object_lookup_id(MTPState *s, int64_t id)
505 {
506 MTPObject *iter;
507
508 QTAILQ_FOREACH(iter, &s->objects, next) {
509 if (iter->watchid == id) {
510 return iter;
511 }
512 }
513
514 return NULL;
515 }
516
file_monitor_event(int64_t id,QFileMonitorEvent ev,const char * name,void * opaque)517 static void file_monitor_event(int64_t id,
518 QFileMonitorEvent ev,
519 const char *name,
520 void *opaque)
521 {
522 MTPState *s = opaque;
523 MTPObject *parent = usb_mtp_object_lookup_id(s, id);
524 MTPMonEntry *entry = NULL;
525 MTPObject *o;
526
527 if (!parent) {
528 return;
529 }
530
531 switch (ev) {
532 case QFILE_MONITOR_EVENT_CREATED:
533 if (usb_mtp_object_lookup_name(parent, name, -1)) {
534 /* Duplicate create event */
535 return;
536 }
537 entry = g_new0(MTPMonEntry, 1);
538 entry->handle = s->next_handle;
539 entry->event = EVT_OBJ_ADDED;
540 o = usb_mtp_add_child(s, parent, name);
541 if (!o) {
542 g_free(entry);
543 return;
544 }
545 trace_usb_mtp_file_monitor_event(s->dev.addr, name, "Obj Added");
546 break;
547
548 case QFILE_MONITOR_EVENT_DELETED:
549 /*
550 * The kernel issues a IN_IGNORED event
551 * when a dir containing a watchpoint is
552 * deleted, so we don't have to delete the
553 * watchpoint
554 */
555 o = usb_mtp_object_lookup_name(parent, name, -1);
556 if (!o) {
557 return;
558 }
559 entry = g_new0(MTPMonEntry, 1);
560 entry->handle = o->handle;
561 entry->event = EVT_OBJ_REMOVED;
562 trace_usb_mtp_file_monitor_event(s->dev.addr, o->path, "Obj Deleted");
563 usb_mtp_object_free(s, o);
564 break;
565
566 case QFILE_MONITOR_EVENT_MODIFIED:
567 o = usb_mtp_object_lookup_name(parent, name, -1);
568 if (!o) {
569 return;
570 }
571 entry = g_new0(MTPMonEntry, 1);
572 entry->handle = o->handle;
573 entry->event = EVT_OBJ_INFO_CHANGED;
574 trace_usb_mtp_file_monitor_event(s->dev.addr, o->path, "Obj Modified");
575 break;
576
577 case QFILE_MONITOR_EVENT_IGNORED:
578 trace_usb_mtp_file_monitor_event(s->dev.addr, parent->path,
579 "Obj parent dir ignored");
580 break;
581
582 case QFILE_MONITOR_EVENT_ATTRIBUTES:
583 break;
584
585 default:
586 g_assert_not_reached();
587 }
588
589 if (entry) {
590 QTAILQ_INSERT_HEAD(&s->events, entry, next);
591 }
592 }
593
usb_mtp_file_monitor_cleanup(MTPState * s)594 static void usb_mtp_file_monitor_cleanup(MTPState *s)
595 {
596 MTPMonEntry *e, *p;
597
598 QTAILQ_FOREACH_SAFE(e, &s->events, next, p) {
599 QTAILQ_REMOVE(&s->events, e, next);
600 g_free(e);
601 }
602
603 qemu_file_monitor_free(s->file_monitor);
604 s->file_monitor = NULL;
605 }
606
607
usb_mtp_object_readdir(MTPState * s,MTPObject * o)608 static void usb_mtp_object_readdir(MTPState *s, MTPObject *o)
609 {
610 struct dirent *entry;
611 DIR *dir;
612 int fd;
613 Error *err = NULL;
614
615 if (o->have_children) {
616 return;
617 }
618 o->have_children = true;
619
620 fd = open(o->path, O_DIRECTORY | O_CLOEXEC | O_NOFOLLOW);
621 if (fd < 0) {
622 return;
623 }
624 dir = fdopendir(fd);
625 if (!dir) {
626 close(fd);
627 return;
628 }
629
630 if (s->file_monitor) {
631 int64_t id = qemu_file_monitor_add_watch(s->file_monitor, o->path, NULL,
632 file_monitor_event, s, &err);
633 if (id == -1) {
634 error_reportf_err(err,
635 "usb-mtp: failed to add watch for %s: ",
636 o->path);
637 } else {
638 trace_usb_mtp_file_monitor_event(s->dev.addr, o->path,
639 "Watch Added");
640 o->watchid = id;
641 }
642 }
643
644 while ((entry = readdir(dir)) != NULL) {
645 usb_mtp_add_child(s, o, entry->d_name);
646 }
647 closedir(dir);
648 }
649
650 /* ----------------------------------------------------------------------- */
651
usb_mtp_data_alloc(MTPControl * c)652 static MTPData *usb_mtp_data_alloc(MTPControl *c)
653 {
654 MTPData *data = g_new0(MTPData, 1);
655
656 data->code = c->code;
657 data->trans = c->trans;
658 data->fd = -1;
659 data->first = true;
660 return data;
661 }
662
usb_mtp_data_free(MTPData * data)663 static void usb_mtp_data_free(MTPData *data)
664 {
665 if (data == NULL) {
666 return;
667 }
668 if (data->fd != -1) {
669 close(data->fd);
670 }
671 g_free(data->data);
672 g_free(data);
673 }
674
usb_mtp_realloc(MTPData * data,uint32_t bytes)675 static void usb_mtp_realloc(MTPData *data, uint32_t bytes)
676 {
677 if (data->length + bytes <= data->alloc) {
678 return;
679 }
680 data->alloc = (data->length + bytes + 0xff) & ~0xff;
681 data->data = g_realloc(data->data, data->alloc);
682 }
683
usb_mtp_add_u8(MTPData * data,uint8_t val)684 static void usb_mtp_add_u8(MTPData *data, uint8_t val)
685 {
686 usb_mtp_realloc(data, 1);
687 data->data[data->length++] = val;
688 }
689
usb_mtp_add_u16(MTPData * data,uint16_t val)690 static void usb_mtp_add_u16(MTPData *data, uint16_t val)
691 {
692 usb_mtp_realloc(data, 2);
693 data->data[data->length++] = (val >> 0) & 0xff;
694 data->data[data->length++] = (val >> 8) & 0xff;
695 }
696
usb_mtp_add_u32(MTPData * data,uint32_t val)697 static void usb_mtp_add_u32(MTPData *data, uint32_t val)
698 {
699 usb_mtp_realloc(data, 4);
700 data->data[data->length++] = (val >> 0) & 0xff;
701 data->data[data->length++] = (val >> 8) & 0xff;
702 data->data[data->length++] = (val >> 16) & 0xff;
703 data->data[data->length++] = (val >> 24) & 0xff;
704 }
705
usb_mtp_add_u64(MTPData * data,uint64_t val)706 static void usb_mtp_add_u64(MTPData *data, uint64_t val)
707 {
708 usb_mtp_realloc(data, 8);
709 data->data[data->length++] = (val >> 0) & 0xff;
710 data->data[data->length++] = (val >> 8) & 0xff;
711 data->data[data->length++] = (val >> 16) & 0xff;
712 data->data[data->length++] = (val >> 24) & 0xff;
713 data->data[data->length++] = (val >> 32) & 0xff;
714 data->data[data->length++] = (val >> 40) & 0xff;
715 data->data[data->length++] = (val >> 48) & 0xff;
716 data->data[data->length++] = (val >> 56) & 0xff;
717 }
718
usb_mtp_add_u16_array(MTPData * data,uint32_t len,const uint16_t * vals)719 static void usb_mtp_add_u16_array(MTPData *data, uint32_t len,
720 const uint16_t *vals)
721 {
722 int i;
723
724 usb_mtp_add_u32(data, len);
725 for (i = 0; i < len; i++) {
726 usb_mtp_add_u16(data, vals[i]);
727 }
728 }
729
usb_mtp_add_u32_array(MTPData * data,uint32_t len,const uint32_t * vals)730 static void usb_mtp_add_u32_array(MTPData *data, uint32_t len,
731 const uint32_t *vals)
732 {
733 int i;
734
735 usb_mtp_add_u32(data, len);
736 for (i = 0; i < len; i++) {
737 usb_mtp_add_u32(data, vals[i]);
738 }
739 }
740
usb_mtp_add_wstr(MTPData * data,const wchar_t * str)741 static void usb_mtp_add_wstr(MTPData *data, const wchar_t *str)
742 {
743 uint32_t len = wcslen(str);
744 int i;
745
746 if (len > 0) {
747 len++; /* include terminating L'\0' */
748 }
749
750 usb_mtp_add_u8(data, len);
751 for (i = 0; i < len; i++) {
752 usb_mtp_add_u16(data, str[i]);
753 }
754 }
755
usb_mtp_add_str(MTPData * data,const char * str)756 static void usb_mtp_add_str(MTPData *data, const char *str)
757 {
758 uint32_t len = strlen(str)+1;
759 wchar_t *wstr = g_new(wchar_t, len);
760 size_t ret;
761
762 ret = mbstowcs(wstr, str, len);
763 if (ret == -1) {
764 usb_mtp_add_wstr(data, L"Oops");
765 } else {
766 usb_mtp_add_wstr(data, wstr);
767 }
768
769 g_free(wstr);
770 }
771
usb_mtp_add_time(MTPData * data,time_t time)772 static void usb_mtp_add_time(MTPData *data, time_t time)
773 {
774 g_autoptr(GDateTime) then = g_date_time_new_from_unix_utc(time);
775 g_autofree char *thenstr = g_date_time_format(then, "%Y%m%dT%H%M%S");
776 usb_mtp_add_str(data, thenstr);
777 }
778
779 /* ----------------------------------------------------------------------- */
780
usb_mtp_queue_result(MTPState * s,uint16_t code,uint32_t trans,int argc,uint32_t arg0,uint32_t arg1,uint32_t arg2)781 static void usb_mtp_queue_result(MTPState *s, uint16_t code, uint32_t trans,
782 int argc, uint32_t arg0, uint32_t arg1,
783 uint32_t arg2)
784 {
785 MTPControl *c = g_new0(MTPControl, 1);
786
787 c->code = code;
788 c->trans = trans;
789 c->argc = argc;
790 if (argc > 0) {
791 c->argv[0] = arg0;
792 }
793 if (argc > 1) {
794 c->argv[1] = arg1;
795 }
796 if (argc > 2) {
797 c->argv[2] = arg2;
798 }
799
800 assert(s->result == NULL);
801 s->result = c;
802 }
803
804 /* ----------------------------------------------------------------------- */
805
usb_mtp_get_device_info(MTPState * s,MTPControl * c)806 static MTPData *usb_mtp_get_device_info(MTPState *s, MTPControl *c)
807 {
808 static const uint16_t ops[] = {
809 CMD_GET_DEVICE_INFO,
810 CMD_OPEN_SESSION,
811 CMD_CLOSE_SESSION,
812 CMD_GET_STORAGE_IDS,
813 CMD_GET_STORAGE_INFO,
814 CMD_GET_NUM_OBJECTS,
815 CMD_GET_OBJECT_HANDLES,
816 CMD_GET_OBJECT_INFO,
817 CMD_DELETE_OBJECT,
818 CMD_SEND_OBJECT_INFO,
819 CMD_SEND_OBJECT,
820 CMD_GET_OBJECT,
821 CMD_GET_PARTIAL_OBJECT,
822 CMD_GET_OBJECT_PROPS_SUPPORTED,
823 CMD_GET_OBJECT_PROP_DESC,
824 CMD_GET_OBJECT_PROP_VALUE,
825 };
826 static const uint16_t fmt[] = {
827 FMT_UNDEFINED_OBJECT,
828 FMT_ASSOCIATION,
829 };
830 MTPData *d = usb_mtp_data_alloc(c);
831
832 trace_usb_mtp_op_get_device_info(s->dev.addr);
833
834 usb_mtp_add_u16(d, 100);
835 usb_mtp_add_u32(d, 0x00000006);
836 usb_mtp_add_u16(d, 0x0064);
837 usb_mtp_add_wstr(d, L"");
838 usb_mtp_add_u16(d, 0x0000);
839
840 usb_mtp_add_u16_array(d, ARRAY_SIZE(ops), ops);
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, 0, NULL);
844 usb_mtp_add_u16_array(d, ARRAY_SIZE(fmt), fmt);
845
846 usb_mtp_add_wstr(d, L"" MTP_MANUFACTURER);
847 usb_mtp_add_wstr(d, L"" MTP_PRODUCT);
848 usb_mtp_add_wstr(d, L"0.1");
849 usb_mtp_add_wstr(d, L"0123456789abcdef0123456789abcdef");
850
851 return d;
852 }
853
usb_mtp_get_storage_ids(MTPState * s,MTPControl * c)854 static MTPData *usb_mtp_get_storage_ids(MTPState *s, MTPControl *c)
855 {
856 static const uint32_t ids[] = {
857 QEMU_STORAGE_ID,
858 };
859 MTPData *d = usb_mtp_data_alloc(c);
860
861 trace_usb_mtp_op_get_storage_ids(s->dev.addr);
862
863 usb_mtp_add_u32_array(d, ARRAY_SIZE(ids), ids);
864
865 return d;
866 }
867
usb_mtp_get_storage_info(MTPState * s,MTPControl * c)868 static MTPData *usb_mtp_get_storage_info(MTPState *s, MTPControl *c)
869 {
870 MTPData *d = usb_mtp_data_alloc(c);
871 struct statvfs buf;
872 int rc;
873
874 trace_usb_mtp_op_get_storage_info(s->dev.addr);
875
876 if (FLAG_SET(s, MTP_FLAG_WRITABLE)) {
877 usb_mtp_add_u16(d, 0x0003);
878 usb_mtp_add_u16(d, 0x0002);
879 usb_mtp_add_u16(d, 0x0000);
880 } else {
881 usb_mtp_add_u16(d, 0x0001);
882 usb_mtp_add_u16(d, 0x0002);
883 usb_mtp_add_u16(d, 0x0001);
884 }
885
886 rc = statvfs(s->root, &buf);
887 if (rc == 0) {
888 usb_mtp_add_u64(d, (uint64_t)buf.f_frsize * buf.f_blocks);
889 usb_mtp_add_u64(d, (uint64_t)buf.f_frsize * buf.f_bavail);
890 usb_mtp_add_u32(d, buf.f_ffree);
891 } else {
892 usb_mtp_add_u64(d, 0xffffffff);
893 usb_mtp_add_u64(d, 0xffffffff);
894 usb_mtp_add_u32(d, 0xffffffff);
895 }
896
897 usb_mtp_add_str(d, s->desc);
898 usb_mtp_add_wstr(d, L"123456789abcdef");
899 return d;
900 }
901
usb_mtp_get_object_handles(MTPState * s,MTPControl * c,MTPObject * o)902 static MTPData *usb_mtp_get_object_handles(MTPState *s, MTPControl *c,
903 MTPObject *o)
904 {
905 MTPData *d = usb_mtp_data_alloc(c);
906 uint32_t i = 0;
907 g_autofree uint32_t *handles = g_new(uint32_t, o->nchildren);
908 MTPObject *iter;
909
910 trace_usb_mtp_op_get_object_handles(s->dev.addr, o->handle, o->path);
911
912 QLIST_FOREACH(iter, &o->children, list) {
913 handles[i++] = iter->handle;
914 }
915 assert(i == o->nchildren);
916 usb_mtp_add_u32_array(d, o->nchildren, handles);
917
918 return d;
919 }
920
usb_mtp_get_object_info(MTPState * s,MTPControl * c,MTPObject * o)921 static MTPData *usb_mtp_get_object_info(MTPState *s, MTPControl *c,
922 MTPObject *o)
923 {
924 MTPData *d = usb_mtp_data_alloc(c);
925
926 trace_usb_mtp_op_get_object_info(s->dev.addr, o->handle, o->path);
927
928 usb_mtp_add_u32(d, QEMU_STORAGE_ID);
929 usb_mtp_add_u16(d, o->format);
930 usb_mtp_add_u16(d, 0);
931
932 if (o->stat.st_size > 0xFFFFFFFF) {
933 usb_mtp_add_u32(d, 0xFFFFFFFF);
934 } else {
935 usb_mtp_add_u32(d, o->stat.st_size);
936 }
937
938 usb_mtp_add_u16(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 usb_mtp_add_u32(d, 0);
945
946 if (o->parent) {
947 usb_mtp_add_u32(d, o->parent->handle);
948 } else {
949 usb_mtp_add_u32(d, 0);
950 }
951 if (o->format == FMT_ASSOCIATION) {
952 usb_mtp_add_u16(d, 0x0001);
953 usb_mtp_add_u32(d, 0x00000001);
954 usb_mtp_add_u32(d, 0);
955 } else {
956 usb_mtp_add_u16(d, 0);
957 usb_mtp_add_u32(d, 0);
958 usb_mtp_add_u32(d, 0);
959 }
960
961 usb_mtp_add_str(d, o->name);
962 usb_mtp_add_time(d, o->stat.st_ctime);
963 usb_mtp_add_time(d, o->stat.st_mtime);
964 usb_mtp_add_wstr(d, L"");
965
966 return d;
967 }
968
usb_mtp_get_object(MTPState * s,MTPControl * c,MTPObject * o)969 static MTPData *usb_mtp_get_object(MTPState *s, MTPControl *c,
970 MTPObject *o)
971 {
972 MTPData *d = usb_mtp_data_alloc(c);
973
974 trace_usb_mtp_op_get_object(s->dev.addr, o->handle, o->path);
975
976 d->fd = open(o->path, O_RDONLY | O_CLOEXEC | O_NOFOLLOW);
977 if (d->fd == -1) {
978 usb_mtp_data_free(d);
979 return NULL;
980 }
981 d->length = o->stat.st_size;
982 d->alloc = 512;
983 d->data = g_malloc(d->alloc);
984 return d;
985 }
986
usb_mtp_get_partial_object(MTPState * s,MTPControl * c,MTPObject * o)987 static MTPData *usb_mtp_get_partial_object(MTPState *s, MTPControl *c,
988 MTPObject *o)
989 {
990 MTPData *d;
991 off_t offset;
992
993 if (c->argc <= 2) {
994 return NULL;
995 }
996 trace_usb_mtp_op_get_partial_object(s->dev.addr, o->handle, o->path,
997 c->argv[1], c->argv[2]);
998
999 d = usb_mtp_data_alloc(c);
1000 d->fd = open(o->path, O_RDONLY | O_CLOEXEC | O_NOFOLLOW);
1001 if (d->fd == -1) {
1002 usb_mtp_data_free(d);
1003 return NULL;
1004 }
1005
1006 offset = c->argv[1];
1007 if (offset > o->stat.st_size) {
1008 offset = o->stat.st_size;
1009 }
1010 if (lseek(d->fd, offset, SEEK_SET) < 0) {
1011 usb_mtp_data_free(d);
1012 return NULL;
1013 }
1014
1015 d->length = c->argv[2];
1016 if (d->length > o->stat.st_size - offset) {
1017 d->length = o->stat.st_size - offset;
1018 }
1019
1020 return d;
1021 }
1022
usb_mtp_get_object_props_supported(MTPState * s,MTPControl * c)1023 static MTPData *usb_mtp_get_object_props_supported(MTPState *s, MTPControl *c)
1024 {
1025 static const uint16_t props[] = {
1026 PROP_STORAGE_ID,
1027 PROP_OBJECT_FORMAT,
1028 PROP_OBJECT_COMPRESSED_SIZE,
1029 PROP_PARENT_OBJECT,
1030 PROP_PERSISTENT_UNIQUE_OBJECT_IDENTIFIER,
1031 PROP_NAME,
1032 };
1033 MTPData *d = usb_mtp_data_alloc(c);
1034 usb_mtp_add_u16_array(d, ARRAY_SIZE(props), props);
1035
1036 return d;
1037 }
1038
usb_mtp_get_object_prop_desc(MTPState * s,MTPControl * c)1039 static MTPData *usb_mtp_get_object_prop_desc(MTPState *s, MTPControl *c)
1040 {
1041 MTPData *d = usb_mtp_data_alloc(c);
1042 switch (c->argv[0]) {
1043 case PROP_STORAGE_ID:
1044 usb_mtp_add_u16(d, PROP_STORAGE_ID);
1045 usb_mtp_add_u16(d, DATA_TYPE_UINT32);
1046 usb_mtp_add_u8(d, 0x00);
1047 usb_mtp_add_u32(d, 0x00000000);
1048 usb_mtp_add_u32(d, 0x00000000);
1049 usb_mtp_add_u8(d, 0x00);
1050 break;
1051 case PROP_OBJECT_FORMAT:
1052 usb_mtp_add_u16(d, PROP_OBJECT_FORMAT);
1053 usb_mtp_add_u16(d, DATA_TYPE_UINT16);
1054 usb_mtp_add_u8(d, 0x00);
1055 usb_mtp_add_u16(d, 0x0000);
1056 usb_mtp_add_u32(d, 0x00000000);
1057 usb_mtp_add_u8(d, 0x00);
1058 break;
1059 case PROP_OBJECT_COMPRESSED_SIZE:
1060 usb_mtp_add_u16(d, PROP_OBJECT_COMPRESSED_SIZE);
1061 usb_mtp_add_u16(d, DATA_TYPE_UINT64);
1062 usb_mtp_add_u8(d, 0x00);
1063 usb_mtp_add_u64(d, 0x0000000000000000);
1064 usb_mtp_add_u32(d, 0x00000000);
1065 usb_mtp_add_u8(d, 0x00);
1066 break;
1067 case PROP_PARENT_OBJECT:
1068 usb_mtp_add_u16(d, PROP_PARENT_OBJECT);
1069 usb_mtp_add_u16(d, DATA_TYPE_UINT32);
1070 usb_mtp_add_u8(d, 0x00);
1071 usb_mtp_add_u32(d, 0x00000000);
1072 usb_mtp_add_u32(d, 0x00000000);
1073 usb_mtp_add_u8(d, 0x00);
1074 break;
1075 case PROP_PERSISTENT_UNIQUE_OBJECT_IDENTIFIER:
1076 usb_mtp_add_u16(d, PROP_PERSISTENT_UNIQUE_OBJECT_IDENTIFIER);
1077 usb_mtp_add_u16(d, DATA_TYPE_UINT128);
1078 usb_mtp_add_u8(d, 0x00);
1079 usb_mtp_add_u64(d, 0x0000000000000000);
1080 usb_mtp_add_u64(d, 0x0000000000000000);
1081 usb_mtp_add_u32(d, 0x00000000);
1082 usb_mtp_add_u8(d, 0x00);
1083 break;
1084 case PROP_NAME:
1085 usb_mtp_add_u16(d, PROP_NAME);
1086 usb_mtp_add_u16(d, DATA_TYPE_STRING);
1087 usb_mtp_add_u8(d, 0x00);
1088 usb_mtp_add_u8(d, 0x00);
1089 usb_mtp_add_u32(d, 0x00000000);
1090 usb_mtp_add_u8(d, 0x00);
1091 break;
1092 default:
1093 usb_mtp_data_free(d);
1094 return NULL;
1095 }
1096
1097 return d;
1098 }
1099
usb_mtp_get_object_prop_value(MTPState * s,MTPControl * c,MTPObject * o)1100 static MTPData *usb_mtp_get_object_prop_value(MTPState *s, MTPControl *c,
1101 MTPObject *o)
1102 {
1103 MTPData *d = usb_mtp_data_alloc(c);
1104 switch (c->argv[1]) {
1105 case PROP_STORAGE_ID:
1106 usb_mtp_add_u32(d, QEMU_STORAGE_ID);
1107 break;
1108 case PROP_OBJECT_FORMAT:
1109 usb_mtp_add_u16(d, o->format);
1110 break;
1111 case PROP_OBJECT_COMPRESSED_SIZE:
1112 usb_mtp_add_u64(d, o->stat.st_size);
1113 break;
1114 case PROP_PARENT_OBJECT:
1115 if (o->parent == NULL) {
1116 usb_mtp_add_u32(d, 0x00000000);
1117 } else {
1118 usb_mtp_add_u32(d, o->parent->handle);
1119 }
1120 break;
1121 case PROP_PERSISTENT_UNIQUE_OBJECT_IDENTIFIER:
1122 /* Should be persistent between sessions,
1123 * but using our objedt ID is "good enough"
1124 * for now */
1125 usb_mtp_add_u64(d, 0x0000000000000000);
1126 usb_mtp_add_u64(d, o->handle);
1127 break;
1128 case PROP_NAME:
1129 usb_mtp_add_str(d, o->name);
1130 break;
1131 default:
1132 usb_mtp_data_free(d);
1133 return NULL;
1134 }
1135
1136 return d;
1137 }
1138
1139 /*
1140 * Return values when object @o is deleted.
1141 * If at least one of the deletions succeeded,
1142 * DELETE_SUCCESS is set and if at least one
1143 * of the deletions failed, DELETE_FAILURE is
1144 * set. Both bits being set (DELETE_PARTIAL)
1145 * signifies a RES_PARTIAL_DELETE being sent
1146 * back to the initiator.
1147 */
1148 enum {
1149 DELETE_SUCCESS = (1 << 0),
1150 DELETE_FAILURE = (1 << 1),
1151 DELETE_PARTIAL = (DELETE_FAILURE | DELETE_SUCCESS),
1152 };
1153
usb_mtp_deletefn(MTPState * s,MTPObject * o,uint32_t trans)1154 static int usb_mtp_deletefn(MTPState *s, MTPObject *o, uint32_t trans)
1155 {
1156 MTPObject *iter, *iter2;
1157 int ret = 0;
1158
1159 /*
1160 * TODO: Add support for Protection Status
1161 */
1162
1163 QLIST_FOREACH(iter, &o->children, list) {
1164 if (iter->format == FMT_ASSOCIATION) {
1165 QLIST_FOREACH(iter2, &iter->children, list) {
1166 ret |= usb_mtp_deletefn(s, iter2, trans);
1167 }
1168 }
1169 }
1170
1171 if (o->format == FMT_UNDEFINED_OBJECT) {
1172 if (remove(o->path)) {
1173 ret |= DELETE_FAILURE;
1174 } else {
1175 usb_mtp_object_free(s, o);
1176 ret |= DELETE_SUCCESS;
1177 }
1178 } else if (o->format == FMT_ASSOCIATION) {
1179 if (rmdir(o->path)) {
1180 ret |= DELETE_FAILURE;
1181 } else {
1182 usb_mtp_object_free(s, o);
1183 ret |= DELETE_SUCCESS;
1184 }
1185 }
1186
1187 return ret;
1188 }
1189
usb_mtp_object_delete(MTPState * s,uint32_t handle,uint32_t format_code,uint32_t trans)1190 static void usb_mtp_object_delete(MTPState *s, uint32_t handle,
1191 uint32_t format_code, uint32_t trans)
1192 {
1193 MTPObject *o;
1194 int ret;
1195
1196 /* Return error if store is read-only */
1197 if (!FLAG_SET(s, MTP_FLAG_WRITABLE)) {
1198 usb_mtp_queue_result(s, RES_STORE_READ_ONLY,
1199 trans, 0, 0, 0, 0);
1200 return;
1201 }
1202
1203 if (format_code != 0) {
1204 usb_mtp_queue_result(s, RES_SPEC_BY_FORMAT_UNSUPPORTED,
1205 trans, 0, 0, 0, 0);
1206 return;
1207 }
1208
1209 if (handle == 0xFFFFFFF) {
1210 o = QTAILQ_FIRST(&s->objects);
1211 } else {
1212 o = usb_mtp_object_lookup(s, handle);
1213 }
1214 if (o == NULL) {
1215 usb_mtp_queue_result(s, RES_INVALID_OBJECT_HANDLE,
1216 trans, 0, 0, 0, 0);
1217 return;
1218 }
1219
1220 ret = usb_mtp_deletefn(s, o, trans);
1221 switch (ret) {
1222 case DELETE_SUCCESS:
1223 usb_mtp_queue_result(s, RES_OK, trans,
1224 0, 0, 0, 0);
1225 break;
1226 case DELETE_FAILURE:
1227 usb_mtp_queue_result(s, RES_PARTIAL_DELETE,
1228 trans, 0, 0, 0, 0);
1229 break;
1230 case DELETE_PARTIAL:
1231 usb_mtp_queue_result(s, RES_PARTIAL_DELETE,
1232 trans, 0, 0, 0, 0);
1233 break;
1234 default:
1235 g_assert_not_reached();
1236 }
1237 }
1238
usb_mtp_command(MTPState * s,MTPControl * c)1239 static void usb_mtp_command(MTPState *s, MTPControl *c)
1240 {
1241 MTPData *data_in = NULL;
1242 MTPObject *o = NULL;
1243 uint32_t nres = 0, res0 = 0;
1244 Error *err = NULL;
1245
1246 /* sanity checks */
1247 if (c->code >= CMD_CLOSE_SESSION && s->session == 0) {
1248 usb_mtp_queue_result(s, RES_SESSION_NOT_OPEN,
1249 c->trans, 0, 0, 0, 0);
1250 return;
1251 }
1252
1253 /* process commands */
1254 switch (c->code) {
1255 case CMD_GET_DEVICE_INFO:
1256 data_in = usb_mtp_get_device_info(s, c);
1257 break;
1258 case CMD_OPEN_SESSION:
1259 if (s->session) {
1260 usb_mtp_queue_result(s, RES_SESSION_ALREADY_OPEN,
1261 c->trans, 1, s->session, 0, 0);
1262 return;
1263 }
1264 if (c->argv[0] == 0) {
1265 usb_mtp_queue_result(s, RES_INVALID_PARAMETER,
1266 c->trans, 0, 0, 0, 0);
1267 return;
1268 }
1269 trace_usb_mtp_op_open_session(s->dev.addr);
1270 s->session = c->argv[0];
1271 usb_mtp_object_alloc(s, s->next_handle++, NULL, s->root);
1272
1273 s->file_monitor = qemu_file_monitor_new(&err);
1274 if (err) {
1275 error_reportf_err(err,
1276 "usb-mtp: file monitoring init failed: ");
1277 } else {
1278 QTAILQ_INIT(&s->events);
1279 }
1280 break;
1281 case CMD_CLOSE_SESSION:
1282 trace_usb_mtp_op_close_session(s->dev.addr);
1283 s->session = 0;
1284 s->next_handle = 0;
1285 usb_mtp_file_monitor_cleanup(s);
1286 usb_mtp_object_free(s, QTAILQ_FIRST(&s->objects));
1287 assert(QTAILQ_EMPTY(&s->objects));
1288 break;
1289 case CMD_GET_STORAGE_IDS:
1290 data_in = usb_mtp_get_storage_ids(s, c);
1291 break;
1292 case CMD_GET_STORAGE_INFO:
1293 if (c->argv[0] != QEMU_STORAGE_ID &&
1294 c->argv[0] != 0xffffffff) {
1295 usb_mtp_queue_result(s, RES_INVALID_STORAGE_ID,
1296 c->trans, 0, 0, 0, 0);
1297 return;
1298 }
1299 data_in = usb_mtp_get_storage_info(s, c);
1300 break;
1301 case CMD_GET_NUM_OBJECTS:
1302 case CMD_GET_OBJECT_HANDLES:
1303 if (c->argv[0] != QEMU_STORAGE_ID &&
1304 c->argv[0] != 0xffffffff) {
1305 usb_mtp_queue_result(s, RES_INVALID_STORAGE_ID,
1306 c->trans, 0, 0, 0, 0);
1307 return;
1308 }
1309 if (c->argv[1] != 0x00000000) {
1310 usb_mtp_queue_result(s, RES_SPEC_BY_FORMAT_UNSUPPORTED,
1311 c->trans, 0, 0, 0, 0);
1312 return;
1313 }
1314 if (c->argv[2] == 0x00000000 ||
1315 c->argv[2] == 0xffffffff) {
1316 o = QTAILQ_FIRST(&s->objects);
1317 } else {
1318 o = usb_mtp_object_lookup(s, c->argv[2]);
1319 }
1320 if (o == NULL) {
1321 usb_mtp_queue_result(s, RES_INVALID_OBJECT_HANDLE,
1322 c->trans, 0, 0, 0, 0);
1323 return;
1324 }
1325 if (o->format != FMT_ASSOCIATION) {
1326 usb_mtp_queue_result(s, RES_INVALID_PARENT_OBJECT,
1327 c->trans, 0, 0, 0, 0);
1328 return;
1329 }
1330 usb_mtp_object_readdir(s, o);
1331 if (c->code == CMD_GET_NUM_OBJECTS) {
1332 trace_usb_mtp_op_get_num_objects(s->dev.addr, o->handle, o->path);
1333 nres = 1;
1334 res0 = o->nchildren;
1335 } else {
1336 data_in = usb_mtp_get_object_handles(s, c, o);
1337 }
1338 break;
1339 case CMD_GET_OBJECT_INFO:
1340 o = usb_mtp_object_lookup(s, c->argv[0]);
1341 if (o == NULL) {
1342 usb_mtp_queue_result(s, RES_INVALID_OBJECT_HANDLE,
1343 c->trans, 0, 0, 0, 0);
1344 return;
1345 }
1346 data_in = usb_mtp_get_object_info(s, c, o);
1347 break;
1348 case CMD_GET_OBJECT:
1349 o = usb_mtp_object_lookup(s, c->argv[0]);
1350 if (o == NULL) {
1351 usb_mtp_queue_result(s, RES_INVALID_OBJECT_HANDLE,
1352 c->trans, 0, 0, 0, 0);
1353 return;
1354 }
1355 if (o->format == FMT_ASSOCIATION) {
1356 usb_mtp_queue_result(s, RES_INVALID_OBJECT_HANDLE,
1357 c->trans, 0, 0, 0, 0);
1358 return;
1359 }
1360 data_in = usb_mtp_get_object(s, c, o);
1361 if (data_in == NULL) {
1362 usb_mtp_queue_result(s, RES_GENERAL_ERROR,
1363 c->trans, 0, 0, 0, 0);
1364 return;
1365 }
1366 break;
1367 case CMD_DELETE_OBJECT:
1368 usb_mtp_object_delete(s, c->argv[0], c->argv[1], c->trans);
1369 return;
1370 case CMD_GET_PARTIAL_OBJECT:
1371 o = usb_mtp_object_lookup(s, c->argv[0]);
1372 if (o == NULL) {
1373 usb_mtp_queue_result(s, RES_INVALID_OBJECT_HANDLE,
1374 c->trans, 0, 0, 0, 0);
1375 return;
1376 }
1377 if (o->format == FMT_ASSOCIATION) {
1378 usb_mtp_queue_result(s, RES_INVALID_OBJECT_HANDLE,
1379 c->trans, 0, 0, 0, 0);
1380 return;
1381 }
1382 data_in = usb_mtp_get_partial_object(s, c, o);
1383 if (data_in == NULL) {
1384 usb_mtp_queue_result(s, RES_GENERAL_ERROR,
1385 c->trans, 0, 0, 0, 0);
1386 return;
1387 }
1388 nres = 1;
1389 res0 = data_in->length;
1390 break;
1391 case CMD_SEND_OBJECT_INFO:
1392 /* Return error if store is read-only */
1393 if (!FLAG_SET(s, MTP_FLAG_WRITABLE)) {
1394 usb_mtp_queue_result(s, RES_STORE_READ_ONLY,
1395 c->trans, 0, 0, 0, 0);
1396 } else if (c->argv[0] && (c->argv[0] != QEMU_STORAGE_ID)) {
1397 /* First parameter points to storage id or is 0 */
1398 usb_mtp_queue_result(s, RES_STORE_NOT_AVAILABLE, c->trans,
1399 0, 0, 0, 0);
1400 } else if (c->argv[1] && !c->argv[0]) {
1401 /* If second parameter is specified, first must also be specified */
1402 usb_mtp_queue_result(s, RES_DESTINATION_UNSUPPORTED, c->trans,
1403 0, 0, 0, 0);
1404 } else {
1405 uint32_t handle = c->argv[1];
1406 if (handle == 0xFFFFFFFF || handle == 0) {
1407 /* root object */
1408 o = QTAILQ_FIRST(&s->objects);
1409 } else {
1410 o = usb_mtp_object_lookup(s, handle);
1411 }
1412 if (o == NULL) {
1413 usb_mtp_queue_result(s, RES_INVALID_OBJECT_HANDLE, c->trans,
1414 0, 0, 0, 0);
1415 } else if (o->format != FMT_ASSOCIATION) {
1416 usb_mtp_queue_result(s, RES_INVALID_PARENT_OBJECT, c->trans,
1417 0, 0, 0, 0);
1418 }
1419 }
1420 if (o) {
1421 s->dataset.parent_handle = o->handle;
1422 }
1423 s->data_out = usb_mtp_data_alloc(c);
1424 return;
1425 case CMD_SEND_OBJECT:
1426 if (!FLAG_SET(s, MTP_FLAG_WRITABLE)) {
1427 usb_mtp_queue_result(s, RES_STORE_READ_ONLY,
1428 c->trans, 0, 0, 0, 0);
1429 return;
1430 }
1431 if (!s->write_pending) {
1432 usb_mtp_queue_result(s, RES_INVALID_OBJECTINFO,
1433 c->trans, 0, 0, 0, 0);
1434 return;
1435 }
1436 s->data_out = usb_mtp_data_alloc(c);
1437 return;
1438 case CMD_GET_OBJECT_PROPS_SUPPORTED:
1439 if (c->argv[0] != FMT_UNDEFINED_OBJECT &&
1440 c->argv[0] != FMT_ASSOCIATION) {
1441 usb_mtp_queue_result(s, RES_INVALID_OBJECT_FORMAT_CODE,
1442 c->trans, 0, 0, 0, 0);
1443 return;
1444 }
1445 data_in = usb_mtp_get_object_props_supported(s, c);
1446 break;
1447 case CMD_GET_OBJECT_PROP_DESC:
1448 if (c->argv[1] != FMT_UNDEFINED_OBJECT &&
1449 c->argv[1] != FMT_ASSOCIATION) {
1450 usb_mtp_queue_result(s, RES_INVALID_OBJECT_FORMAT_CODE,
1451 c->trans, 0, 0, 0, 0);
1452 return;
1453 }
1454 data_in = usb_mtp_get_object_prop_desc(s, c);
1455 if (data_in == NULL) {
1456 usb_mtp_queue_result(s, RES_INVALID_OBJECT_PROP_CODE,
1457 c->trans, 0, 0, 0, 0);
1458 return;
1459 }
1460 break;
1461 case CMD_GET_OBJECT_PROP_VALUE:
1462 o = usb_mtp_object_lookup(s, c->argv[0]);
1463 if (o == NULL) {
1464 usb_mtp_queue_result(s, RES_INVALID_OBJECT_HANDLE,
1465 c->trans, 0, 0, 0, 0);
1466 return;
1467 }
1468 data_in = usb_mtp_get_object_prop_value(s, c, o);
1469 if (data_in == NULL) {
1470 usb_mtp_queue_result(s, RES_INVALID_OBJECT_PROP_CODE,
1471 c->trans, 0, 0, 0, 0);
1472 return;
1473 }
1474 break;
1475 default:
1476 trace_usb_mtp_op_unknown(s->dev.addr, c->code);
1477 usb_mtp_queue_result(s, RES_OPERATION_NOT_SUPPORTED,
1478 c->trans, 0, 0, 0, 0);
1479 return;
1480 }
1481
1482 /* return results on success */
1483 if (data_in) {
1484 assert(s->data_in == NULL);
1485 s->data_in = data_in;
1486 }
1487 usb_mtp_queue_result(s, RES_OK, c->trans, nres, res0, 0, 0);
1488 }
1489
1490 /* ----------------------------------------------------------------------- */
1491
usb_mtp_handle_reset(USBDevice * dev)1492 static void usb_mtp_handle_reset(USBDevice *dev)
1493 {
1494 MTPState *s = USB_MTP(dev);
1495
1496 trace_usb_mtp_reset(s->dev.addr);
1497
1498 usb_mtp_file_monitor_cleanup(s);
1499 usb_mtp_object_free(s, QTAILQ_FIRST(&s->objects));
1500 s->session = 0;
1501 usb_mtp_data_free(s->data_in);
1502 s->data_in = NULL;
1503 usb_mtp_data_free(s->data_out);
1504 s->data_out = NULL;
1505 g_free(s->result);
1506 s->result = NULL;
1507 }
1508
usb_mtp_handle_control(USBDevice * dev,USBPacket * p,int request,int value,int index,int length,uint8_t * data)1509 static void usb_mtp_handle_control(USBDevice *dev, USBPacket *p,
1510 int request, int value, int index,
1511 int length, uint8_t *data)
1512 {
1513 int ret;
1514 MTPState *s = USB_MTP(dev);
1515 uint16_t *event = (uint16_t *)data;
1516
1517 switch (request) {
1518 case ClassInterfaceOutRequest | 0x64:
1519 if (*event == EVT_CANCEL_TRANSACTION) {
1520 g_free(s->result);
1521 s->result = NULL;
1522 usb_mtp_data_free(s->data_in);
1523 s->data_in = NULL;
1524 if (s->write_pending) {
1525 g_free(s->dataset.filename);
1526 s->write_pending = false;
1527 s->dataset.size = 0;
1528 }
1529 usb_mtp_data_free(s->data_out);
1530 s->data_out = NULL;
1531 } else {
1532 p->status = USB_RET_STALL;
1533 }
1534 break;
1535 default:
1536 ret = usb_desc_handle_control(dev, p, request,
1537 value, index, length, data);
1538 if (ret >= 0) {
1539 return;
1540 }
1541 }
1542
1543 trace_usb_mtp_stall(dev->addr, "unknown control request");
1544 }
1545
usb_mtp_cancel_packet(USBDevice * dev,USBPacket * p)1546 static void usb_mtp_cancel_packet(USBDevice *dev, USBPacket *p)
1547 {
1548 /* we don't use async packets, so this should never be called */
1549 fprintf(stderr, "%s\n", __func__);
1550 }
1551
utf16_to_str(uint8_t len,uint8_t * str16)1552 static char *utf16_to_str(uint8_t len, uint8_t *str16)
1553 {
1554 wchar_t *wstr = g_new0(wchar_t, len + 1);
1555 int count, dlen;
1556 char *dest;
1557
1558 for (count = 0; count < len; count++) {
1559 /* FIXME: not working for surrogate pairs */
1560 wstr[count] = lduw_le_p(str16 + (count * 2));
1561 }
1562 wstr[count] = 0;
1563
1564 dlen = wcstombs(NULL, wstr, 0) + 1;
1565 dest = g_malloc(dlen);
1566 wcstombs(dest, wstr, dlen);
1567 g_free(wstr);
1568 return dest;
1569 }
1570
1571 /* Wrapper around write, returns 0 on failure */
write_retry(int fd,void * buf,uint64_t size,off_t offset)1572 static uint64_t write_retry(int fd, void *buf, uint64_t size, off_t offset)
1573 {
1574 uint64_t ret = 0;
1575
1576 if (lseek(fd, offset, SEEK_SET) < 0) {
1577 goto done;
1578 }
1579
1580 ret = qemu_write_full(fd, buf, size);
1581
1582 done:
1583 return ret;
1584 }
1585
usb_mtp_update_object(MTPObject * parent,char * name)1586 static int usb_mtp_update_object(MTPObject *parent, char *name)
1587 {
1588 int ret = 0;
1589
1590 MTPObject *o =
1591 usb_mtp_object_lookup_name(parent, name, strlen(name));
1592
1593 if (o) {
1594 ret = lstat(o->path, &o->stat);
1595 }
1596
1597 return ret;
1598 }
1599
usb_mtp_write_data(MTPState * s,uint32_t handle)1600 static void usb_mtp_write_data(MTPState *s, uint32_t handle)
1601 {
1602 MTPData *d = s->data_out;
1603 MTPObject *parent =
1604 usb_mtp_object_lookup(s, s->dataset.parent_handle);
1605 char *path = NULL;
1606 uint64_t rc;
1607 mode_t mask = 0755;
1608 int ret = 0;
1609
1610 assert(d != NULL);
1611
1612 switch (d->write_status) {
1613 case WRITE_START:
1614 if (!parent || !s->write_pending) {
1615 usb_mtp_queue_result(s, RES_INVALID_OBJECTINFO, d->trans,
1616 0, 0, 0, 0);
1617 return;
1618 }
1619
1620 if (s->dataset.filename) {
1621 path = g_strdup_printf("%s/%s", parent->path, s->dataset.filename);
1622 if (s->dataset.format == FMT_ASSOCIATION) {
1623 ret = g_mkdir(path, mask);
1624 if (!ret) {
1625 usb_mtp_queue_result(s, RES_OK, d->trans, 3,
1626 QEMU_STORAGE_ID,
1627 s->dataset.parent_handle,
1628 handle);
1629 goto close;
1630 }
1631 goto done;
1632 }
1633
1634 d->fd = open(path, O_CREAT | O_WRONLY |
1635 O_CLOEXEC | O_NOFOLLOW, mask & 0666);
1636 if (d->fd == -1) {
1637 ret = 1;
1638 goto done;
1639 }
1640
1641 /* Return success if initiator sent 0 sized data */
1642 if (!s->dataset.size) {
1643 goto done;
1644 }
1645 if (d->length != MTP_WRITE_BUF_SZ && !d->pending) {
1646 d->write_status = WRITE_END;
1647 }
1648 }
1649 /* fall through */
1650 case WRITE_CONTINUE:
1651 case WRITE_END:
1652 rc = write_retry(d->fd, d->data, d->data_offset,
1653 d->offset - d->data_offset);
1654 if (rc != d->data_offset) {
1655 ret = 1;
1656 goto done;
1657 }
1658 if (d->write_status != WRITE_END) {
1659 g_free(path);
1660 return;
1661 } else {
1662 /*
1663 * Return an incomplete transfer if file size doesn't match
1664 * for < 4G file or if lstat fails which will result in an incorrect
1665 * file size
1666 */
1667 if ((s->dataset.size != 0xFFFFFFFF &&
1668 d->offset != s->dataset.size) ||
1669 usb_mtp_update_object(parent, s->dataset.filename)) {
1670 usb_mtp_queue_result(s, RES_INCOMPLETE_TRANSFER, d->trans,
1671 0, 0, 0, 0);
1672 goto close;
1673 }
1674 }
1675 }
1676
1677 done:
1678 if (ret) {
1679 usb_mtp_queue_result(s, RES_STORE_FULL, d->trans,
1680 0, 0, 0, 0);
1681 } else {
1682 usb_mtp_queue_result(s, RES_OK, d->trans,
1683 0, 0, 0, 0);
1684 }
1685 close:
1686 /*
1687 * The write dataset is kept around and freed only
1688 * on success or if another write request comes in
1689 */
1690 if (d->fd != -1) {
1691 close(d->fd);
1692 d->fd = -1;
1693 }
1694 g_free(s->dataset.filename);
1695 s->dataset.size = 0;
1696 g_free(path);
1697 s->write_pending = false;
1698 }
1699
usb_mtp_write_metadata(MTPState * s,uint64_t dlen)1700 static void usb_mtp_write_metadata(MTPState *s, uint64_t dlen)
1701 {
1702 MTPData *d = s->data_out;
1703 ObjectInfo *dataset = (ObjectInfo *)d->data;
1704 char *filename;
1705 MTPObject *o;
1706 MTPObject *p = usb_mtp_object_lookup(s, s->dataset.parent_handle);
1707 uint32_t next_handle = s->next_handle;
1708 size_t filename_chars = dlen - offsetof(ObjectInfo, filename);
1709
1710 /*
1711 * filename is utf-16. We're intentionally doing
1712 * integer division to truncate if malicious guest
1713 * sent an odd number of bytes.
1714 */
1715 filename_chars /= 2;
1716
1717 assert(!s->write_pending);
1718 assert(p != NULL);
1719
1720 filename = utf16_to_str(MIN(dataset->length, filename_chars),
1721 dataset->filename);
1722
1723 if (strchr(filename, '/')) {
1724 usb_mtp_queue_result(s, RES_PARAMETER_NOT_SUPPORTED, d->trans,
1725 0, 0, 0, 0);
1726 g_free(filename);
1727 return;
1728 }
1729
1730 o = usb_mtp_object_lookup_name(p, filename, -1);
1731 if (o != NULL) {
1732 next_handle = o->handle;
1733 }
1734
1735 s->dataset.filename = filename;
1736 s->dataset.format = dataset->format;
1737 s->dataset.size = dataset->size;
1738 s->write_pending = true;
1739
1740 if (s->dataset.format == FMT_ASSOCIATION) {
1741 usb_mtp_write_data(s, next_handle);
1742 } else {
1743 usb_mtp_queue_result(s, RES_OK, d->trans, 3, QEMU_STORAGE_ID,
1744 s->dataset.parent_handle, next_handle);
1745 }
1746 }
1747
usb_mtp_get_data(MTPState * s,mtp_container * container,USBPacket * p)1748 static void usb_mtp_get_data(MTPState *s, mtp_container *container,
1749 USBPacket *p)
1750 {
1751 MTPData *d = s->data_out;
1752 uint64_t dlen;
1753 uint32_t data_len = p->iov.size;
1754 uint64_t total_len;
1755
1756 if (!d) {
1757 usb_mtp_queue_result(s, RES_INVALID_OBJECTINFO, 0,
1758 0, 0, 0, 0);
1759 return;
1760 }
1761 if (d->first) {
1762 /* Total length of incoming data */
1763 total_len = cpu_to_le32(container->length) - sizeof(mtp_container);
1764 /* Length of data in this packet */
1765 data_len -= sizeof(mtp_container);
1766 if (total_len < MTP_WRITE_BUF_SZ) {
1767 usb_mtp_realloc(d, total_len);
1768 d->length += total_len;
1769 } else {
1770 usb_mtp_realloc(d, MTP_WRITE_BUF_SZ - sizeof(mtp_container));
1771 d->length += MTP_WRITE_BUF_SZ - sizeof(mtp_container);
1772 }
1773 d->offset = 0;
1774 d->first = false;
1775 d->pending = false;
1776 d->data_offset = 0;
1777 d->write_status = WRITE_START;
1778 }
1779
1780 if (d->pending) {
1781 memset(d->data, 0, d->length);
1782 if (d->length != MTP_WRITE_BUF_SZ) {
1783 usb_mtp_realloc(d, MTP_WRITE_BUF_SZ - d->length);
1784 d->length += (MTP_WRITE_BUF_SZ - d->length);
1785 }
1786 d->pending = false;
1787 d->write_status = WRITE_CONTINUE;
1788 d->data_offset = 0;
1789 }
1790
1791 if (d->length - d->data_offset > data_len) {
1792 dlen = data_len;
1793 } else {
1794 dlen = d->length - d->data_offset;
1795 }
1796
1797 switch (d->code) {
1798 case CMD_SEND_OBJECT_INFO:
1799 usb_packet_copy(p, d->data + d->data_offset, dlen);
1800 d->offset += dlen;
1801 d->data_offset += dlen;
1802 if (d->data_offset == d->length) {
1803 /* The operation might have already failed */
1804 if (!s->result) {
1805 usb_mtp_write_metadata(s, dlen);
1806 }
1807 usb_mtp_data_free(s->data_out);
1808 s->data_out = NULL;
1809 return;
1810 }
1811 break;
1812 case CMD_SEND_OBJECT:
1813 usb_packet_copy(p, d->data + d->data_offset, dlen);
1814 d->offset += dlen;
1815 d->data_offset += dlen;
1816 if ((p->iov.size % 64) || !p->iov.size) {
1817 assert((s->dataset.size == 0xFFFFFFFF) ||
1818 (s->dataset.size == d->offset));
1819
1820 if (d->length == MTP_WRITE_BUF_SZ) {
1821 d->write_status = WRITE_END;
1822 } else {
1823 d->write_status = WRITE_START;
1824 }
1825 usb_mtp_write_data(s, 0);
1826 usb_mtp_data_free(s->data_out);
1827 s->data_out = NULL;
1828 return;
1829 }
1830 if (d->data_offset == d->length) {
1831 d->pending = true;
1832 usb_mtp_write_data(s, 0);
1833 }
1834 break;
1835 default:
1836 p->status = USB_RET_STALL;
1837 return;
1838 }
1839 }
1840
usb_mtp_handle_data(USBDevice * dev,USBPacket * p)1841 static void usb_mtp_handle_data(USBDevice *dev, USBPacket *p)
1842 {
1843 MTPState *s = USB_MTP(dev);
1844 MTPControl cmd;
1845 mtp_container container;
1846 uint32_t params[5];
1847 uint16_t container_type;
1848 int i, rc;
1849
1850 switch (p->ep->nr) {
1851 case EP_DATA_IN:
1852 if (s->data_out != NULL) {
1853 /* guest bug */
1854 trace_usb_mtp_stall(s->dev.addr, "awaiting data-out");
1855 p->status = USB_RET_STALL;
1856 return;
1857 }
1858 if (p->iov.size < sizeof(container)) {
1859 trace_usb_mtp_stall(s->dev.addr, "packet too small");
1860 p->status = USB_RET_STALL;
1861 return;
1862 }
1863 if (s->data_in != NULL) {
1864 MTPData *d = s->data_in;
1865 uint64_t dlen = d->length - d->offset;
1866 if (d->first) {
1867 trace_usb_mtp_data_in(s->dev.addr, d->trans, d->length);
1868 if (d->length + sizeof(container) > 0xFFFFFFFF) {
1869 container.length = cpu_to_le32(0xFFFFFFFF);
1870 } else {
1871 container.length =
1872 cpu_to_le32(d->length + sizeof(container));
1873 }
1874 container.type = cpu_to_le16(TYPE_DATA);
1875 container.code = cpu_to_le16(d->code);
1876 container.trans = cpu_to_le32(d->trans);
1877 usb_packet_copy(p, &container, sizeof(container));
1878 d->first = false;
1879 if (dlen > p->iov.size - sizeof(container)) {
1880 dlen = p->iov.size - sizeof(container);
1881 }
1882 } else {
1883 if (dlen > p->iov.size) {
1884 dlen = p->iov.size;
1885 }
1886 }
1887 if (d->fd == -1) {
1888 usb_packet_copy(p, d->data + d->offset, dlen);
1889 } else {
1890 if (d->alloc < p->iov.size) {
1891 d->alloc = p->iov.size;
1892 d->data = g_realloc(d->data, d->alloc);
1893 }
1894 rc = read(d->fd, d->data, dlen);
1895 if (rc != dlen) {
1896 memset(d->data, 0, dlen);
1897 s->result->code = RES_INCOMPLETE_TRANSFER;
1898 }
1899 usb_packet_copy(p, d->data, dlen);
1900 }
1901 d->offset += dlen;
1902 if (d->offset == d->length) {
1903 usb_mtp_data_free(s->data_in);
1904 s->data_in = NULL;
1905 }
1906 } else if (s->result != NULL) {
1907 MTPControl *r = s->result;
1908 int length = sizeof(container) + r->argc * sizeof(uint32_t);
1909 if (r->code == RES_OK) {
1910 trace_usb_mtp_success(s->dev.addr, r->trans,
1911 (r->argc > 0) ? r->argv[0] : 0,
1912 (r->argc > 1) ? r->argv[1] : 0);
1913 } else {
1914 trace_usb_mtp_error(s->dev.addr, r->code, r->trans,
1915 (r->argc > 0) ? r->argv[0] : 0,
1916 (r->argc > 1) ? r->argv[1] : 0);
1917 }
1918 container.length = cpu_to_le32(length);
1919 container.type = cpu_to_le16(TYPE_RESPONSE);
1920 container.code = cpu_to_le16(r->code);
1921 container.trans = cpu_to_le32(r->trans);
1922 for (i = 0; i < r->argc; i++) {
1923 params[i] = cpu_to_le32(r->argv[i]);
1924 }
1925 usb_packet_copy(p, &container, sizeof(container));
1926 usb_packet_copy(p, ¶ms, length - sizeof(container));
1927 g_free(s->result);
1928 s->result = NULL;
1929 }
1930 break;
1931 case EP_DATA_OUT:
1932 if (p->iov.size < sizeof(container)) {
1933 trace_usb_mtp_stall(s->dev.addr, "packet too small");
1934 p->status = USB_RET_STALL;
1935 return;
1936 }
1937 if ((s->data_out != NULL) && !s->data_out->first) {
1938 container_type = TYPE_DATA;
1939 } else {
1940 usb_packet_copy(p, &container, sizeof(container));
1941 container_type = le16_to_cpu(container.type);
1942 }
1943 switch (container_type) {
1944 case TYPE_COMMAND:
1945 if (s->data_in || s->data_out || s->result) {
1946 trace_usb_mtp_stall(s->dev.addr, "transaction inflight");
1947 p->status = USB_RET_STALL;
1948 return;
1949 }
1950 cmd.code = le16_to_cpu(container.code);
1951 cmd.argc = (le32_to_cpu(container.length) - sizeof(container))
1952 / sizeof(uint32_t);
1953 cmd.trans = le32_to_cpu(container.trans);
1954 if (cmd.argc > ARRAY_SIZE(cmd.argv)) {
1955 cmd.argc = ARRAY_SIZE(cmd.argv);
1956 }
1957 if (p->iov.size < sizeof(container) + cmd.argc * sizeof(uint32_t)) {
1958 trace_usb_mtp_stall(s->dev.addr, "packet too small");
1959 p->status = USB_RET_STALL;
1960 return;
1961 }
1962 usb_packet_copy(p, ¶ms, cmd.argc * sizeof(uint32_t));
1963 for (i = 0; i < cmd.argc; i++) {
1964 cmd.argv[i] = le32_to_cpu(params[i]);
1965 }
1966 trace_usb_mtp_command(s->dev.addr, cmd.code, cmd.trans,
1967 (cmd.argc > 0) ? cmd.argv[0] : 0,
1968 (cmd.argc > 1) ? cmd.argv[1] : 0,
1969 (cmd.argc > 2) ? cmd.argv[2] : 0,
1970 (cmd.argc > 3) ? cmd.argv[3] : 0,
1971 (cmd.argc > 4) ? cmd.argv[4] : 0);
1972 usb_mtp_command(s, &cmd);
1973 break;
1974 case TYPE_DATA:
1975 /* One of the previous transfers has already errored but the
1976 * responder is still sending data associated with it
1977 */
1978 if (s->result != NULL) {
1979 return;
1980 }
1981 usb_mtp_get_data(s, &container, p);
1982 break;
1983 default:
1984 /* not needed as long as the mtp device is read-only */
1985 p->status = USB_RET_STALL;
1986 return;
1987 }
1988 break;
1989 case EP_EVENT:
1990 if (!QTAILQ_EMPTY(&s->events)) {
1991 struct MTPMonEntry *e = QTAILQ_LAST(&s->events);
1992 uint32_t handle;
1993 int len = sizeof(container) + sizeof(uint32_t);
1994
1995 if (p->iov.size < len) {
1996 trace_usb_mtp_stall(s->dev.addr,
1997 "packet too small to send event");
1998 p->status = USB_RET_STALL;
1999 return;
2000 }
2001
2002 QTAILQ_REMOVE(&s->events, e, next);
2003 container.length = cpu_to_le32(len);
2004 container.type = cpu_to_le32(TYPE_EVENT);
2005 container.code = cpu_to_le16(e->event);
2006 container.trans = 0; /* no trans specific events */
2007 handle = cpu_to_le32(e->handle);
2008 usb_packet_copy(p, &container, sizeof(container));
2009 usb_packet_copy(p, &handle, sizeof(uint32_t));
2010 g_free(e);
2011 return;
2012 }
2013 p->status = USB_RET_NAK;
2014 return;
2015 default:
2016 trace_usb_mtp_stall(s->dev.addr, "invalid endpoint");
2017 p->status = USB_RET_STALL;
2018 return;
2019 }
2020
2021 if (p->actual_length == 0) {
2022 trace_usb_mtp_nak(s->dev.addr, p->ep->nr);
2023 p->status = USB_RET_NAK;
2024 return;
2025 } else {
2026 trace_usb_mtp_xfer(s->dev.addr, p->ep->nr, p->actual_length,
2027 p->iov.size);
2028 return;
2029 }
2030 }
2031
usb_mtp_realize(USBDevice * dev,Error ** errp)2032 static void usb_mtp_realize(USBDevice *dev, Error **errp)
2033 {
2034 MTPState *s = USB_MTP(dev);
2035
2036 if ((s->root == NULL) || !g_path_is_absolute(s->root)) {
2037 error_setg(errp, "usb-mtp: rootdir must be configured and be an absolute path");
2038 return;
2039 }
2040
2041 if (access(s->root, R_OK) != 0) {
2042 error_setg(errp, "usb-mtp: rootdir does not exist/not readable");
2043 return;
2044 } else if (!s->readonly && access(s->root, W_OK) != 0) {
2045 error_setg(errp, "usb-mtp: rootdir does not have write permissions");
2046 return;
2047 }
2048
2049 /* Mark store as RW */
2050 if (!s->readonly) {
2051 s->flags |= (1 << MTP_FLAG_WRITABLE);
2052 }
2053
2054 if (s->desc == NULL) {
2055 /*
2056 * This does not check if path exists
2057 * but we have the checks above
2058 */
2059 s->desc = g_path_get_basename(s->root);
2060 }
2061
2062 usb_desc_create_serial(dev);
2063 usb_desc_init(dev);
2064 QTAILQ_INIT(&s->objects);
2065
2066 }
2067
2068 static const VMStateDescription vmstate_usb_mtp = {
2069 .name = "usb-mtp",
2070 .unmigratable = 1,
2071 .version_id = 1,
2072 .minimum_version_id = 1,
2073 .fields = (const VMStateField[]) {
2074 VMSTATE_USB_DEVICE(dev, MTPState),
2075 VMSTATE_END_OF_LIST()
2076 }
2077 };
2078
2079 static const Property mtp_properties[] = {
2080 DEFINE_PROP_STRING("rootdir", MTPState, root),
2081 DEFINE_PROP_STRING("desc", MTPState, desc),
2082 DEFINE_PROP_BOOL("readonly", MTPState, readonly, true),
2083 };
2084
usb_mtp_class_initfn(ObjectClass * klass,const void * data)2085 static void usb_mtp_class_initfn(ObjectClass *klass, const void *data)
2086 {
2087 DeviceClass *dc = DEVICE_CLASS(klass);
2088 USBDeviceClass *uc = USB_DEVICE_CLASS(klass);
2089
2090 uc->realize = usb_mtp_realize;
2091 uc->product_desc = "QEMU USB MTP";
2092 uc->usb_desc = &desc;
2093 uc->cancel_packet = usb_mtp_cancel_packet;
2094 uc->handle_attach = usb_desc_attach;
2095 uc->handle_reset = usb_mtp_handle_reset;
2096 uc->handle_control = usb_mtp_handle_control;
2097 uc->handle_data = usb_mtp_handle_data;
2098 set_bit(DEVICE_CATEGORY_STORAGE, dc->categories);
2099 dc->desc = "USB Media Transfer Protocol device";
2100 dc->fw_name = "mtp";
2101 dc->vmsd = &vmstate_usb_mtp;
2102 device_class_set_props(dc, mtp_properties);
2103 }
2104
2105 static const TypeInfo mtp_info = {
2106 .name = TYPE_USB_MTP,
2107 .parent = TYPE_USB_DEVICE,
2108 .instance_size = sizeof(MTPState),
2109 .class_init = usb_mtp_class_initfn,
2110 };
2111
usb_mtp_register_types(void)2112 static void usb_mtp_register_types(void)
2113 {
2114 type_register_static(&mtp_info);
2115 }
2116
2117 type_init(usb_mtp_register_types)
2118