OpenE2K/qemu-e2k
13
4
Fork 0
Code Issues 4 Pull Requests Projects 2 Releases Activity
02017ee385
qemu-e2k/hw/usb/dev-mtp.c
Bandan Das 7ddf837465 usb-mtp: prevent null dereference while deleting objects 
Spotted by Coverity: CID 1399144

Signed-off-by: Bandan Das <bsd@redhat.com>
Message-id: 20190306210409.14842-4-bsd@redhat.com
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
2019-03-07 10:02:48 +01:00

2105 lines
60 KiB
C
Raw Blame History

/*
* Media Transfer Protocol implementation, backed by host filesystem.
*
* Copyright Red Hat, Inc 2014
*
* Author:
* Gerd Hoffmann <kraxel@redhat.com>
*
* This code is licensed under the GPL v2 or later.
*/
#include "qemu/osdep.h"
#include "qapi/error.h"
#include "qemu/error-report.h"
#include <wchar.h>
#include <dirent.h>
#include <sys/statvfs.h>
#include "qemu-common.h"
#include "qemu/iov.h"
#include "qemu/filemonitor.h"
#include "trace.h"
#include "hw/usb.h"
#include "desc.h"
#include "qemu/units.h"
/* ----------------------------------------------------------------------- */
enum mtp_container_type {
TYPE_COMMAND = 1,
TYPE_DATA = 2,
TYPE_RESPONSE = 3,
TYPE_EVENT = 4,
};
/* MTP write stage, for internal use only */
enum mtp_write_status {
WRITE_START = 1,
WRITE_CONTINUE = 2,
WRITE_END = 3,
};
enum mtp_code {
/* command codes */
CMD_GET_DEVICE_INFO = 0x1001,
CMD_OPEN_SESSION = 0x1002,
CMD_CLOSE_SESSION = 0x1003,
CMD_GET_STORAGE_IDS = 0x1004,
CMD_GET_STORAGE_INFO = 0x1005,
CMD_GET_NUM_OBJECTS = 0x1006,
CMD_GET_OBJECT_HANDLES = 0x1007,
CMD_GET_OBJECT_INFO = 0x1008,
CMD_GET_OBJECT = 0x1009,
CMD_DELETE_OBJECT = 0x100b,
CMD_SEND_OBJECT_INFO = 0x100c,
CMD_SEND_OBJECT = 0x100d,
CMD_GET_PARTIAL_OBJECT = 0x101b,
CMD_GET_OBJECT_PROPS_SUPPORTED = 0x9801,
CMD_GET_OBJECT_PROP_DESC = 0x9802,
CMD_GET_OBJECT_PROP_VALUE = 0x9803,
/* response codes */
RES_OK = 0x2001,
RES_GENERAL_ERROR = 0x2002,
RES_SESSION_NOT_OPEN = 0x2003,
RES_INVALID_TRANSACTION_ID = 0x2004,
RES_OPERATION_NOT_SUPPORTED = 0x2005,
RES_PARAMETER_NOT_SUPPORTED = 0x2006,
RES_INCOMPLETE_TRANSFER = 0x2007,
RES_INVALID_STORAGE_ID = 0x2008,
RES_INVALID_OBJECT_HANDLE = 0x2009,
RES_INVALID_OBJECT_FORMAT_CODE = 0x200b,
RES_STORE_FULL = 0x200c,
RES_STORE_READ_ONLY = 0x200e,
RES_PARTIAL_DELETE = 0x2012,
RES_STORE_NOT_AVAILABLE = 0x2013,
RES_SPEC_BY_FORMAT_UNSUPPORTED = 0x2014,
RES_INVALID_OBJECTINFO = 0x2015,
RES_DESTINATION_UNSUPPORTED = 0x2020,
RES_INVALID_PARENT_OBJECT = 0x201a,
RES_INVALID_PARAMETER = 0x201d,
RES_SESSION_ALREADY_OPEN = 0x201e,
RES_INVALID_OBJECT_PROP_CODE = 0xA801,
/* format codes */
FMT_UNDEFINED_OBJECT = 0x3000,
FMT_ASSOCIATION = 0x3001,
/* event codes */
EVT_CANCEL_TRANSACTION = 0x4001,
EVT_OBJ_ADDED = 0x4002,
EVT_OBJ_REMOVED = 0x4003,
EVT_OBJ_INFO_CHANGED = 0x4007,
/* object properties */
PROP_STORAGE_ID = 0xDC01,
PROP_OBJECT_FORMAT = 0xDC02,
PROP_OBJECT_COMPRESSED_SIZE = 0xDC04,
PROP_PARENT_OBJECT = 0xDC0B,
PROP_PERSISTENT_UNIQUE_OBJECT_IDENTIFIER = 0xDC41,
PROP_NAME = 0xDC44,
};
enum mtp_data_type {
DATA_TYPE_UINT16 = 0x0004,
DATA_TYPE_UINT32 = 0x0006,
DATA_TYPE_UINT64 = 0x0008,
DATA_TYPE_UINT128 = 0x000a,
DATA_TYPE_STRING = 0xffff,
};
typedef struct {
uint32_t length;
uint16_t type;
uint16_t code;
uint32_t trans;
} QEMU_PACKED mtp_container;
/* ----------------------------------------------------------------------- */
typedef struct MTPState MTPState;
typedef struct MTPControl MTPControl;
typedef struct MTPData MTPData;
typedef struct MTPObject MTPObject;
enum {
EP_DATA_IN = 1,
EP_DATA_OUT,
EP_EVENT,
};
typedef struct MTPMonEntry MTPMonEntry;
struct MTPMonEntry {
uint32_t event;
uint32_t handle;
QTAILQ_ENTRY(MTPMonEntry) next;
};
struct MTPControl {
uint16_t code;
uint32_t trans;
int argc;
uint32_t argv[5];
};
struct MTPData {
uint16_t code;
uint32_t trans;
uint64_t offset;
uint64_t length;
uint64_t alloc;
uint8_t *data;
bool first;
/* Used for >4G file sizes */
bool pending;
int fd;
uint8_t write_status;
/* Internal pointer per every MTP_WRITE_BUF_SZ */
uint64_t data_offset;
};
struct MTPObject {
uint32_t handle;
uint16_t format;
char *name;
char *path;
struct stat stat;
/* file monitor watch id */
int watchid;
MTPObject *parent;
uint32_t nchildren;
QLIST_HEAD(, MTPObject) children;
QLIST_ENTRY(MTPObject) list;
bool have_children;
QTAILQ_ENTRY(MTPObject) next;
};
struct MTPState {
USBDevice dev;
char *root;
char *desc;
uint32_t flags;
MTPData *data_in;
MTPData *data_out;
MTPControl *result;
uint32_t session;
uint32_t next_handle;
bool readonly;
QTAILQ_HEAD(, MTPObject) objects;
QFileMonitor *file_monitor;
QTAILQ_HEAD(, MTPMonEntry) events;
/* Responder is expecting a write operation */
bool write_pending;
struct {
uint32_t parent_handle;
uint16_t format;
uint32_t size;
char *filename;
} dataset;
};
/*
* ObjectInfo dataset received from initiator
* Fields we don't care about are ignored
*/
typedef struct {
uint32_t storage_id; /*unused*/
uint16_t format;
uint16_t protection_status; /*unused*/
uint32_t size;
uint16_t thumb_format; /*unused*/
uint32_t thumb_comp_sz; /*unused*/
uint32_t thumb_pix_width; /*unused*/
uint32_t thumb_pix_height; /*unused*/
uint32_t image_pix_width; /*unused*/
uint32_t image_pix_height; /*unused*/
uint32_t image_bit_depth; /*unused*/
uint32_t parent; /*unused*/
uint16_t assoc_type;
uint32_t assoc_desc;
uint32_t seq_no; /*unused*/
uint8_t length; /*part of filename field*/
uint16_t filename[0];
char date_created[0]; /*unused*/
char date_modified[0]; /*unused*/
char keywords[0]; /*unused*/
/* string and other data follows */
} QEMU_PACKED ObjectInfo;
#define TYPE_USB_MTP "usb-mtp"
#define USB_MTP(obj) OBJECT_CHECK(MTPState, (obj), TYPE_USB_MTP)
#define QEMU_STORAGE_ID 0x00010001
#define MTP_FLAG_WRITABLE 0
#define FLAG_SET(_mtp, _flag) ((_mtp)->flags & (1 << (_flag)))
/* ----------------------------------------------------------------------- */
#define MTP_MANUFACTURER "QEMU"
#define MTP_PRODUCT "QEMU filesharing"
#define MTP_WRITE_BUF_SZ (512 * KiB)
enum {
STR_MANUFACTURER = 1,
STR_PRODUCT,
STR_SERIALNUMBER,
STR_MTP,
STR_CONFIG_FULL,
STR_CONFIG_HIGH,
STR_CONFIG_SUPER,
};
static const USBDescStrings desc_strings = {
[STR_MANUFACTURER] = MTP_MANUFACTURER,
[STR_PRODUCT] = MTP_PRODUCT,
[STR_SERIALNUMBER] = "34617",
[STR_MTP] = "MTP",
[STR_CONFIG_FULL] = "Full speed config (usb 1.1)",
[STR_CONFIG_HIGH] = "High speed config (usb 2.0)",
[STR_CONFIG_SUPER] = "Super speed config (usb 3.0)",
};
static const USBDescIface desc_iface_full = {
.bInterfaceNumber = 0,
.bNumEndpoints = 3,
.bInterfaceClass = USB_CLASS_STILL_IMAGE,
.bInterfaceSubClass = 0x01,
.bInterfaceProtocol = 0x01,
.iInterface = STR_MTP,
.eps = (USBDescEndpoint[]) {
{
.bEndpointAddress = USB_DIR_IN | EP_DATA_IN,
.bmAttributes = USB_ENDPOINT_XFER_BULK,
.wMaxPacketSize = 64,
},{
.bEndpointAddress = USB_DIR_OUT | EP_DATA_OUT,
.bmAttributes = USB_ENDPOINT_XFER_BULK,
.wMaxPacketSize = 64,
},{
.bEndpointAddress = USB_DIR_IN | EP_EVENT,
.bmAttributes = USB_ENDPOINT_XFER_INT,
.wMaxPacketSize = 64,
.bInterval = 0x0a,
},
}
};
static const USBDescDevice desc_device_full = {
.bcdUSB = 0x0200,
.bMaxPacketSize0 = 8,
.bNumConfigurations = 1,
.confs = (USBDescConfig[]) {
{
.bNumInterfaces = 1,
.bConfigurationValue = 1,
.iConfiguration = STR_CONFIG_FULL,
.bmAttributes = USB_CFG_ATT_ONE | USB_CFG_ATT_WAKEUP,
.bMaxPower = 2,
.nif = 1,
.ifs = &desc_iface_full,
},
},
};
static const USBDescIface desc_iface_high = {
.bInterfaceNumber = 0,
.bNumEndpoints = 3,
.bInterfaceClass = USB_CLASS_STILL_IMAGE,
.bInterfaceSubClass = 0x01,
.bInterfaceProtocol = 0x01,
.iInterface = STR_MTP,
.eps = (USBDescEndpoint[]) {
{
.bEndpointAddress = USB_DIR_IN | EP_DATA_IN,
.bmAttributes = USB_ENDPOINT_XFER_BULK,
.wMaxPacketSize = 512,
},{
.bEndpointAddress = USB_DIR_OUT | EP_DATA_OUT,
.bmAttributes = USB_ENDPOINT_XFER_BULK,
.wMaxPacketSize = 512,
},{
.bEndpointAddress = USB_DIR_IN | EP_EVENT,
.bmAttributes = USB_ENDPOINT_XFER_INT,
.wMaxPacketSize = 64,
.bInterval = 0x0a,
},
}
};
static const USBDescDevice desc_device_high = {
.bcdUSB = 0x0200,
.bMaxPacketSize0 = 64,
.bNumConfigurations = 1,
.confs = (USBDescConfig[]) {
{
.bNumInterfaces = 1,
.bConfigurationValue = 1,
.iConfiguration = STR_CONFIG_HIGH,
.bmAttributes = USB_CFG_ATT_ONE | USB_CFG_ATT_WAKEUP,
.bMaxPower = 2,
.nif = 1,
.ifs = &desc_iface_high,
},
},
};
static const USBDescMSOS desc_msos = {
.CompatibleID = "MTP",
.SelectiveSuspendEnabled = true,
};
static const USBDesc desc = {
.id = {
.idVendor = 0x46f4, /* CRC16() of "QEMU" */
.idProduct = 0x0004,
.bcdDevice = 0,
.iManufacturer = STR_MANUFACTURER,
.iProduct = STR_PRODUCT,
.iSerialNumber = STR_SERIALNUMBER,
},
.full = &desc_device_full,
.high = &desc_device_high,
.str = desc_strings,
.msos = &desc_msos,
};
/* ----------------------------------------------------------------------- */
static MTPObject *usb_mtp_object_alloc(MTPState *s, uint32_t handle,
MTPObject *parent, const char *name)
{
MTPObject *o = g_new0(MTPObject, 1);
if (name[0] == '.') {
goto ignore;
}
o->watchid = -1;
o->handle = handle;
o->parent = parent;
o->name = g_strdup(name);
if (parent == NULL) {
o->path = g_strdup(name);
} else {
o->path = g_strdup_printf("%s/%s", parent->path, name);
}
if (lstat(o->path, &o->stat) != 0) {
goto ignore;
}
if (S_ISREG(o->stat.st_mode)) {
o->format = FMT_UNDEFINED_OBJECT;
} else if (S_ISDIR(o->stat.st_mode)) {
o->format = FMT_ASSOCIATION;
} else {
goto ignore;
}
if (access(o->path, R_OK) != 0) {
goto ignore;
}
trace_usb_mtp_object_alloc(s->dev.addr, o->handle, o->path);
QTAILQ_INSERT_TAIL(&s->objects, o, next);
return o;
ignore:
g_free(o->name);
g_free(o->path);
g_free(o);
return NULL;
}
static void usb_mtp_object_free(MTPState *s, MTPObject *o)
{
MTPObject *iter;
if (!o) {
return;
}
trace_usb_mtp_object_free(s->dev.addr, o->handle, o->path);
if (o->watchid != -1 && s->file_monitor) {
qemu_file_monitor_remove_watch(s->file_monitor, o->path, o->watchid);
}
QTAILQ_REMOVE(&s->objects, o, next);
if (o->parent) {
QLIST_REMOVE(o, list);
o->parent->nchildren--;
}
while (!QLIST_EMPTY(&o->children)) {
iter = QLIST_FIRST(&o->children);
usb_mtp_object_free(s, iter);
}
g_free(o->name);
g_free(o->path);
g_free(o);
}
static MTPObject *usb_mtp_object_lookup(MTPState *s, uint32_t handle)
{
MTPObject *o;
QTAILQ_FOREACH(o, &s->objects, next) {
if (o->handle == handle) {
return o;
}
}
return NULL;
}
static MTPObject *usb_mtp_add_child(MTPState *s, MTPObject *o,
const char *name)
{
MTPObject *child =
usb_mtp_object_alloc(s, s->next_handle++, o, name);
if (child) {
trace_usb_mtp_add_child(s->dev.addr, child->handle, child->path);
QLIST_INSERT_HEAD(&o->children, child, list);
o->nchildren++;
if (child->format == FMT_ASSOCIATION) {
QLIST_INIT(&child->children);
}
}
return child;
}
static MTPObject *usb_mtp_object_lookup_name(MTPObject *parent,
const char *name, int len)
{
MTPObject *iter;
if (len == -1) {
len = strlen(name);
}
QLIST_FOREACH(iter, &parent->children, list) {
if (strncmp(iter->name, name, len) == 0) {
return iter;
}
}
return NULL;
}
static MTPObject *usb_mtp_object_lookup_id(MTPState *s, int id)
{
MTPObject *iter;
QTAILQ_FOREACH(iter, &s->objects, next) {
if (iter->watchid == id) {
return iter;
}
}
return NULL;
}
static void file_monitor_event(int id,
QFileMonitorEvent ev,
const char *name,
void *opaque)
{
MTPState *s = opaque;
MTPObject *parent = usb_mtp_object_lookup_id(s, id);
MTPMonEntry *entry = NULL;
MTPObject *o;
if (!parent) {
return;
}
switch (ev) {
case QFILE_MONITOR_EVENT_CREATED:
if (usb_mtp_object_lookup_name(parent, name, -1)) {
/* Duplicate create event */
return;
}
entry = g_new0(MTPMonEntry, 1);
entry->handle = s->next_handle;
entry->event = EVT_OBJ_ADDED;
o = usb_mtp_add_child(s, parent, name);
if (!o) {
g_free(entry);
return;
}
trace_usb_mtp_file_monitor_event(s->dev.addr, name, "Obj Added");
break;
case QFILE_MONITOR_EVENT_DELETED:
/*
* The kernel issues a IN_IGNORED event
* when a dir containing a watchpoint is
* deleted, so we don't have to delete the
* watchpoint
*/
o = usb_mtp_object_lookup_name(parent, name, -1);
if (!o) {
return;
}
entry = g_new0(MTPMonEntry, 1);
entry->handle = o->handle;
entry->event = EVT_OBJ_REMOVED;
trace_usb_mtp_file_monitor_event(s->dev.addr, o->path, "Obj Deleted");
usb_mtp_object_free(s, o);
break;
case QFILE_MONITOR_EVENT_MODIFIED:
o = usb_mtp_object_lookup_name(parent, name, -1);
if (!o) {
return;
}
entry = g_new0(MTPMonEntry, 1);
entry->handle = o->handle;
entry->event = EVT_OBJ_INFO_CHANGED;
trace_usb_mtp_file_monitor_event(s->dev.addr, o->path, "Obj Modified");
break;
case QFILE_MONITOR_EVENT_IGNORED:
trace_usb_mtp_file_monitor_event(s->dev.addr, parent->path,
"Obj parent dir ignored");
break;
case QFILE_MONITOR_EVENT_ATTRIBUTES:
break;
default:
g_assert_not_reached();
}
if (entry) {
QTAILQ_INSERT_HEAD(&s->events, entry, next);
}
}
static void usb_mtp_file_monitor_cleanup(MTPState *s)
{
MTPMonEntry *e, *p;
QTAILQ_FOREACH_SAFE(e, &s->events, next, p) {
QTAILQ_REMOVE(&s->events, e, next);
g_free(e);
}
qemu_file_monitor_free(s->file_monitor);
s->file_monitor = NULL;
}
static void usb_mtp_object_readdir(MTPState *s, MTPObject *o)
{
struct dirent *entry;
DIR *dir;
int fd;
Error *err = NULL;
if (o->have_children) {
return;
}
o->have_children = true;
fd = open(o->path, O_DIRECTORY | O_CLOEXEC | O_NOFOLLOW);
if (fd < 0) {
return;
}
dir = fdopendir(fd);
if (!dir) {
close(fd);
return;
}
if (s->file_monitor) {
int id = qemu_file_monitor_add_watch(s->file_monitor, o->path, NULL,
file_monitor_event, s, &err);
if (id == -1) {
error_report("usb-mtp: failed to add watch for %s: %s", o->path,
error_get_pretty(err));
error_free(err);
} else {
trace_usb_mtp_file_monitor_event(s->dev.addr, o->path,
"Watch Added");
o->watchid = id;
}
}
while ((entry = readdir(dir)) != NULL) {
usb_mtp_add_child(s, o, entry->d_name);
}
closedir(dir);
}
/* ----------------------------------------------------------------------- */
static MTPData *usb_mtp_data_alloc(MTPControl *c)
{
MTPData *data = g_new0(MTPData, 1);
data->code = c->code;
data->trans = c->trans;
data->fd = -1;
data->first = true;
return data;
}
static void usb_mtp_data_free(MTPData *data)
{
if (data == NULL) {
return;
}
if (data->fd != -1) {
close(data->fd);
}
g_free(data->data);
g_free(data);
}
static void usb_mtp_realloc(MTPData *data, uint32_t bytes)
{
if (data->length + bytes <= data->alloc) {
return;
}
data->alloc = (data->length + bytes + 0xff) & ~0xff;
data->data = g_realloc(data->data, data->alloc);
}
static void usb_mtp_add_u8(MTPData *data, uint8_t val)
{
usb_mtp_realloc(data, 1);
data->data[data->length++] = val;
}
static void usb_mtp_add_u16(MTPData *data, uint16_t val)
{
usb_mtp_realloc(data, 2);
data->data[data->length++] = (val >> 0) & 0xff;
data->data[data->length++] = (val >> 8) & 0xff;
}
static void usb_mtp_add_u32(MTPData *data, uint32_t val)
{
usb_mtp_realloc(data, 4);
data->data[data->length++] = (val >> 0) & 0xff;
data->data[data->length++] = (val >> 8) & 0xff;
data->data[data->length++] = (val >> 16) & 0xff;
data->data[data->length++] = (val >> 24) & 0xff;
}
static void usb_mtp_add_u64(MTPData *data, uint64_t val)
{
usb_mtp_realloc(data, 8);
data->data[data->length++] = (val >> 0) & 0xff;
data->data[data->length++] = (val >> 8) & 0xff;
data->data[data->length++] = (val >> 16) & 0xff;
data->data[data->length++] = (val >> 24) & 0xff;
data->data[data->length++] = (val >> 32) & 0xff;
data->data[data->length++] = (val >> 40) & 0xff;
data->data[data->length++] = (val >> 48) & 0xff;
data->data[data->length++] = (val >> 56) & 0xff;
}
static void usb_mtp_add_u16_array(MTPData *data, uint32_t len,
const uint16_t *vals)
{
int i;
usb_mtp_add_u32(data, len);
for (i = 0; i < len; i++) {
usb_mtp_add_u16(data, vals[i]);
}
}
static void usb_mtp_add_u32_array(MTPData *data, uint32_t len,
const uint32_t *vals)
{
int i;
usb_mtp_add_u32(data, len);
for (i = 0; i < len; i++) {
usb_mtp_add_u32(data, vals[i]);
}
}
static void usb_mtp_add_wstr(MTPData *data, const wchar_t *str)
{
uint32_t len = wcslen(str);
int i;
if (len > 0) {
len++; /* include terminating L'\0' */
}
usb_mtp_add_u8(data, len);
for (i = 0; i < len; i++) {
usb_mtp_add_u16(data, str[i]);
}
}
static void usb_mtp_add_str(MTPData *data, const char *str)
{
uint32_t len = strlen(str)+1;
wchar_t *wstr = g_new(wchar_t, len);
size_t ret;
ret = mbstowcs(wstr, str, len);
if (ret == -1) {
usb_mtp_add_wstr(data, L"Oops");
} else {
usb_mtp_add_wstr(data, wstr);
}
g_free(wstr);
}
static void usb_mtp_add_time(MTPData *data, time_t time)
{
char buf[16];
struct tm tm;
gmtime_r(&time, &tm);
strftime(buf, sizeof(buf), "%Y%m%dT%H%M%S", &tm);
usb_mtp_add_str(data, buf);
}
/* ----------------------------------------------------------------------- */
static void usb_mtp_queue_result(MTPState *s, uint16_t code, uint32_t trans,
int argc, uint32_t arg0, uint32_t arg1,
uint32_t arg2)
{
MTPControl *c = g_new0(MTPControl, 1);
c->code = code;
c->trans = trans;
c->argc = argc;
if (argc > 0) {
c->argv[0] = arg0;
}
if (argc > 1) {
c->argv[1] = arg1;
}
if (argc > 2) {
c->argv[2] = arg2;
}
assert(s->result == NULL);
s->result = c;
}
/* ----------------------------------------------------------------------- */
static MTPData *usb_mtp_get_device_info(MTPState *s, MTPControl *c)
{
static const uint16_t ops[] = {
CMD_GET_DEVICE_INFO,
CMD_OPEN_SESSION,
CMD_CLOSE_SESSION,
CMD_GET_STORAGE_IDS,
CMD_GET_STORAGE_INFO,
CMD_GET_NUM_OBJECTS,
CMD_GET_OBJECT_HANDLES,
CMD_GET_OBJECT_INFO,
CMD_DELETE_OBJECT,
CMD_SEND_OBJECT_INFO,
CMD_SEND_OBJECT,
CMD_GET_OBJECT,
CMD_GET_PARTIAL_OBJECT,
CMD_GET_OBJECT_PROPS_SUPPORTED,
CMD_GET_OBJECT_PROP_DESC,
CMD_GET_OBJECT_PROP_VALUE,
};
static const uint16_t fmt[] = {
FMT_UNDEFINED_OBJECT,
FMT_ASSOCIATION,
};
MTPData *d = usb_mtp_data_alloc(c);
trace_usb_mtp_op_get_device_info(s->dev.addr);
usb_mtp_add_u16(d, 100);
usb_mtp_add_u32(d, 0x00000006);
usb_mtp_add_u16(d, 0x0064);
usb_mtp_add_wstr(d, L"");
usb_mtp_add_u16(d, 0x0000);
usb_mtp_add_u16_array(d, ARRAY_SIZE(ops), ops);
usb_mtp_add_u16_array(d, 0, NULL);
usb_mtp_add_u16_array(d, 0, NULL);
usb_mtp_add_u16_array(d, 0, NULL);
usb_mtp_add_u16_array(d, ARRAY_SIZE(fmt), fmt);
usb_mtp_add_wstr(d, L"" MTP_MANUFACTURER);
usb_mtp_add_wstr(d, L"" MTP_PRODUCT);
usb_mtp_add_wstr(d, L"0.1");
usb_mtp_add_wstr(d, L"0123456789abcdef0123456789abcdef");
return d;
}
static MTPData *usb_mtp_get_storage_ids(MTPState *s, MTPControl *c)
{
static const uint32_t ids[] = {
QEMU_STORAGE_ID,
};
MTPData *d = usb_mtp_data_alloc(c);
trace_usb_mtp_op_get_storage_ids(s->dev.addr);
usb_mtp_add_u32_array(d, ARRAY_SIZE(ids), ids);
return d;
}
static MTPData *usb_mtp_get_storage_info(MTPState *s, MTPControl *c)
{
MTPData *d = usb_mtp_data_alloc(c);
struct statvfs buf;
int rc;
trace_usb_mtp_op_get_storage_info(s->dev.addr);
if (FLAG_SET(s, MTP_FLAG_WRITABLE)) {
usb_mtp_add_u16(d, 0x0003);
usb_mtp_add_u16(d, 0x0002);
usb_mtp_add_u16(d, 0x0000);
} else {
usb_mtp_add_u16(d, 0x0001);
usb_mtp_add_u16(d, 0x0002);
usb_mtp_add_u16(d, 0x0001);
}
rc = statvfs(s->root, &buf);
if (rc == 0) {
usb_mtp_add_u64(d, (uint64_t)buf.f_frsize * buf.f_blocks);
usb_mtp_add_u64(d, (uint64_t)buf.f_bavail * buf.f_blocks);
usb_mtp_add_u32(d, buf.f_ffree);
} else {
usb_mtp_add_u64(d, 0xffffffff);
usb_mtp_add_u64(d, 0xffffffff);
usb_mtp_add_u32(d, 0xffffffff);
}
usb_mtp_add_str(d, s->desc);
usb_mtp_add_wstr(d, L"123456789abcdef");
return d;
}
static MTPData *usb_mtp_get_object_handles(MTPState *s, MTPControl *c,
MTPObject *o)
{
MTPData *d = usb_mtp_data_alloc(c);
uint32_t i = 0, handles[o->nchildren];
MTPObject *iter;
trace_usb_mtp_op_get_object_handles(s->dev.addr, o->handle, o->path);
QLIST_FOREACH(iter, &o->children, list) {
handles[i++] = iter->handle;
}
assert(i == o->nchildren);
usb_mtp_add_u32_array(d, o->nchildren, handles);
return d;
}
static MTPData *usb_mtp_get_object_info(MTPState *s, MTPControl *c,
MTPObject *o)
{
MTPData *d = usb_mtp_data_alloc(c);
trace_usb_mtp_op_get_object_info(s->dev.addr, o->handle, o->path);
usb_mtp_add_u32(d, QEMU_STORAGE_ID);
usb_mtp_add_u16(d, o->format);
usb_mtp_add_u16(d, 0);
if (o->stat.st_size > 0xFFFFFFFF) {
usb_mtp_add_u32(d, 0xFFFFFFFF);
} else {
usb_mtp_add_u32(d, o->stat.st_size);
}
usb_mtp_add_u16(d, 0);
usb_mtp_add_u32(d, 0);
usb_mtp_add_u32(d, 0);
usb_mtp_add_u32(d, 0);
usb_mtp_add_u32(d, 0);
usb_mtp_add_u32(d, 0);
usb_mtp_add_u32(d, 0);
if (o->parent) {
usb_mtp_add_u32(d, o->parent->handle);
} else {
usb_mtp_add_u32(d, 0);
}
if (o->format == FMT_ASSOCIATION) {
usb_mtp_add_u16(d, 0x0001);
usb_mtp_add_u32(d, 0x00000001);
usb_mtp_add_u32(d, 0);
} else {
usb_mtp_add_u16(d, 0);
usb_mtp_add_u32(d, 0);
usb_mtp_add_u32(d, 0);
}
usb_mtp_add_str(d, o->name);
usb_mtp_add_time(d, o->stat.st_ctime);
usb_mtp_add_time(d, o->stat.st_mtime);
usb_mtp_add_wstr(d, L"");
return d;
}
static MTPData *usb_mtp_get_object(MTPState *s, MTPControl *c,
MTPObject *o)
{
MTPData *d = usb_mtp_data_alloc(c);
trace_usb_mtp_op_get_object(s->dev.addr, o->handle, o->path);
d->fd = open(o->path, O_RDONLY | O_CLOEXEC | O_NOFOLLOW);
if (d->fd == -1) {
usb_mtp_data_free(d);
return NULL;
}
d->length = o->stat.st_size;
d->alloc = 512;
d->data = g_malloc(d->alloc);
return d;
}
static MTPData *usb_mtp_get_partial_object(MTPState *s, MTPControl *c,
MTPObject *o)
{
MTPData *d;
off_t offset;
if (c->argc <= 2) {
return NULL;
}
trace_usb_mtp_op_get_partial_object(s->dev.addr, o->handle, o->path,
c->argv[1], c->argv[2]);
d = usb_mtp_data_alloc(c);
d->fd = open(o->path, O_RDONLY | O_CLOEXEC | O_NOFOLLOW);
if (d->fd == -1) {
usb_mtp_data_free(d);
return NULL;
}
offset = c->argv[1];
if (offset > o->stat.st_size) {
offset = o->stat.st_size;
}
if (lseek(d->fd, offset, SEEK_SET) < 0) {
usb_mtp_data_free(d);
return NULL;
}
d->length = c->argv[2];
if (d->length > o->stat.st_size - offset) {
d->length = o->stat.st_size - offset;
}
return d;
}
static MTPData *usb_mtp_get_object_props_supported(MTPState *s, MTPControl *c)
{
static const uint16_t props[] = {
PROP_STORAGE_ID,
PROP_OBJECT_FORMAT,
PROP_OBJECT_COMPRESSED_SIZE,
PROP_PARENT_OBJECT,
PROP_PERSISTENT_UNIQUE_OBJECT_IDENTIFIER,
PROP_NAME,
};
MTPData *d = usb_mtp_data_alloc(c);
usb_mtp_add_u16_array(d, ARRAY_SIZE(props), props);
return d;
}
static MTPData *usb_mtp_get_object_prop_desc(MTPState *s, MTPControl *c)
{
MTPData *d = usb_mtp_data_alloc(c);
switch (c->argv[0]) {
case PROP_STORAGE_ID:
usb_mtp_add_u16(d, PROP_STORAGE_ID);
usb_mtp_add_u16(d, DATA_TYPE_UINT32);
usb_mtp_add_u8(d, 0x00);
usb_mtp_add_u32(d, 0x00000000);
usb_mtp_add_u32(d, 0x00000000);
usb_mtp_add_u8(d, 0x00);
break;
case PROP_OBJECT_FORMAT:
usb_mtp_add_u16(d, PROP_OBJECT_FORMAT);
usb_mtp_add_u16(d, DATA_TYPE_UINT16);
usb_mtp_add_u8(d, 0x00);
usb_mtp_add_u16(d, 0x0000);
usb_mtp_add_u32(d, 0x00000000);
usb_mtp_add_u8(d, 0x00);
break;
case PROP_OBJECT_COMPRESSED_SIZE:
usb_mtp_add_u16(d, PROP_OBJECT_COMPRESSED_SIZE);
usb_mtp_add_u16(d, DATA_TYPE_UINT64);
usb_mtp_add_u8(d, 0x00);
usb_mtp_add_u64(d, 0x0000000000000000);
usb_mtp_add_u32(d, 0x00000000);
usb_mtp_add_u8(d, 0x00);
break;
case PROP_PARENT_OBJECT:
usb_mtp_add_u16(d, PROP_PARENT_OBJECT);
usb_mtp_add_u16(d, DATA_TYPE_UINT32);
usb_mtp_add_u8(d, 0x00);
usb_mtp_add_u32(d, 0x00000000);
usb_mtp_add_u32(d, 0x00000000);
usb_mtp_add_u8(d, 0x00);
break;
case PROP_PERSISTENT_UNIQUE_OBJECT_IDENTIFIER:
usb_mtp_add_u16(d, PROP_PERSISTENT_UNIQUE_OBJECT_IDENTIFIER);
usb_mtp_add_u16(d, DATA_TYPE_UINT128);
usb_mtp_add_u8(d, 0x00);
usb_mtp_add_u64(d, 0x0000000000000000);
usb_mtp_add_u64(d, 0x0000000000000000);
usb_mtp_add_u32(d, 0x00000000);
usb_mtp_add_u8(d, 0x00);
break;
case PROP_NAME:
usb_mtp_add_u16(d, PROP_NAME);
usb_mtp_add_u16(d, DATA_TYPE_STRING);
usb_mtp_add_u8(d, 0x00);
usb_mtp_add_u8(d, 0x00);
usb_mtp_add_u32(d, 0x00000000);
usb_mtp_add_u8(d, 0x00);
break;
default:
usb_mtp_data_free(d);
return NULL;
}
return d;
}
static MTPData *usb_mtp_get_object_prop_value(MTPState *s, MTPControl *c,
MTPObject *o)
{
MTPData *d = usb_mtp_data_alloc(c);
switch (c->argv[1]) {
case PROP_STORAGE_ID:
usb_mtp_add_u32(d, QEMU_STORAGE_ID);
break;
case PROP_OBJECT_FORMAT:
usb_mtp_add_u16(d, o->format);
break;
case PROP_OBJECT_COMPRESSED_SIZE:
usb_mtp_add_u64(d, o->stat.st_size);
break;
case PROP_PARENT_OBJECT:
if (o->parent == NULL) {
usb_mtp_add_u32(d, 0x00000000);
} else {
usb_mtp_add_u32(d, o->parent->handle);
}
break;
case PROP_PERSISTENT_UNIQUE_OBJECT_IDENTIFIER:
/* Should be persistent between sessions,
* but using our objedt ID is "good enough"
* for now */
usb_mtp_add_u64(d, 0x0000000000000000);
usb_mtp_add_u64(d, o->handle);
break;
case PROP_NAME:
usb_mtp_add_str(d, o->name);
break;
default:
usb_mtp_data_free(d);
return NULL;
}
return d;
}
/* Return correct return code for a delete event */
enum {
ALL_DELETE,
PARTIAL_DELETE,
READ_ONLY,
};
/* Assumes that children, if any, have been already freed */
static void usb_mtp_object_free_one(MTPState *s, MTPObject *o)
{
assert(o->nchildren == 0);
QTAILQ_REMOVE(&s->objects, o, next);
g_free(o->name);
g_free(o->path);
g_free(o);
}
static int usb_mtp_deletefn(MTPState *s, MTPObject *o, uint32_t trans)
{
MTPObject *iter, *iter2;
bool partial_delete = false;
bool success = false;
/*
* TODO: Add support for Protection Status
*/
QLIST_FOREACH(iter, &o->children, list) {
if (iter->format == FMT_ASSOCIATION) {
QLIST_FOREACH(iter2, &iter->children, list) {
usb_mtp_deletefn(s, iter2, trans);
}
}
}
if (o->format == FMT_UNDEFINED_OBJECT) {
if (remove(o->path)) {
partial_delete = true;
} else {
usb_mtp_object_free_one(s, o);
success = true;
}
} else if (o->format == FMT_ASSOCIATION) {
if (rmdir(o->path)) {
partial_delete = true;
} else {
usb_mtp_object_free_one(s, o);
success = true;
}
}
if (success && partial_delete) {
return PARTIAL_DELETE;
}
if (!success && partial_delete) {
return READ_ONLY;
}
return ALL_DELETE;
}
static void usb_mtp_object_delete(MTPState *s, uint32_t handle,
uint32_t format_code, uint32_t trans)
{
MTPObject *o;
int ret;
/* Return error if store is read-only */
if (!FLAG_SET(s, MTP_FLAG_WRITABLE)) {
usb_mtp_queue_result(s, RES_STORE_READ_ONLY,
trans, 0, 0, 0, 0);
return;
}
if (format_code != 0) {
usb_mtp_queue_result(s, RES_SPEC_BY_FORMAT_UNSUPPORTED,
trans, 0, 0, 0, 0);
return;
}
if (handle == 0xFFFFFFF) {
o = QTAILQ_FIRST(&s->objects);
} else {
o = usb_mtp_object_lookup(s, handle);
}
if (o == NULL) {
usb_mtp_queue_result(s, RES_INVALID_OBJECT_HANDLE,
trans, 0, 0, 0, 0);
return;
}
ret = usb_mtp_deletefn(s, o, trans);
if (ret == PARTIAL_DELETE) {
usb_mtp_queue_result(s, RES_PARTIAL_DELETE,
trans, 0, 0, 0, 0);
return;
} else if (ret == READ_ONLY) {
usb_mtp_queue_result(s, RES_STORE_READ_ONLY, trans,
0, 0, 0, 0);
return;
} else {
usb_mtp_queue_result(s, RES_OK, trans,
0, 0, 0, 0);
return;
}
}
static void usb_mtp_command(MTPState *s, MTPControl *c)
{
MTPData *data_in = NULL;
MTPObject *o = NULL;
uint32_t nres = 0, res0 = 0;
Error *err = NULL;
/* sanity checks */
if (c->code >= CMD_CLOSE_SESSION && s->session == 0) {
usb_mtp_queue_result(s, RES_SESSION_NOT_OPEN,
c->trans, 0, 0, 0, 0);
return;
}
/* process commands */
switch (c->code) {
case CMD_GET_DEVICE_INFO:
data_in = usb_mtp_get_device_info(s, c);
break;
case CMD_OPEN_SESSION:
if (s->session) {
usb_mtp_queue_result(s, RES_SESSION_ALREADY_OPEN,
c->trans, 1, s->session, 0, 0);
return;
}
if (c->argv[0] == 0) {
usb_mtp_queue_result(s, RES_INVALID_PARAMETER,
c->trans, 0, 0, 0, 0);
return;
}
trace_usb_mtp_op_open_session(s->dev.addr);
s->session = c->argv[0];
usb_mtp_object_alloc(s, s->next_handle++, NULL, s->root);
s->file_monitor = qemu_file_monitor_new(&err);
if (err) {
error_report("usb-mtp: file monitoring init failed: %s",
error_get_pretty(err));
error_free(err);
} else {
QTAILQ_INIT(&s->events);
}
break;
case CMD_CLOSE_SESSION:
trace_usb_mtp_op_close_session(s->dev.addr);
s->session = 0;
s->next_handle = 0;
usb_mtp_file_monitor_cleanup(s);
usb_mtp_object_free(s, QTAILQ_FIRST(&s->objects));
assert(QTAILQ_EMPTY(&s->objects));
break;
case CMD_GET_STORAGE_IDS:
data_in = usb_mtp_get_storage_ids(s, c);
break;
case CMD_GET_STORAGE_INFO:
if (c->argv[0] != QEMU_STORAGE_ID &&
c->argv[0] != 0xffffffff) {
usb_mtp_queue_result(s, RES_INVALID_STORAGE_ID,
c->trans, 0, 0, 0, 0);
return;
}
data_in = usb_mtp_get_storage_info(s, c);
break;
case CMD_GET_NUM_OBJECTS:
case CMD_GET_OBJECT_HANDLES:
if (c->argv[0] != QEMU_STORAGE_ID &&
c->argv[0] != 0xffffffff) {
usb_mtp_queue_result(s, RES_INVALID_STORAGE_ID,
c->trans, 0, 0, 0, 0);
return;
}
if (c->argv[1] != 0x00000000) {
usb_mtp_queue_result(s, RES_SPEC_BY_FORMAT_UNSUPPORTED,
c->trans, 0, 0, 0, 0);
return;
}
if (c->argv[2] == 0x00000000 ||
c->argv[2] == 0xffffffff) {
o = QTAILQ_FIRST(&s->objects);
} else {
o = usb_mtp_object_lookup(s, c->argv[2]);
}
if (o == NULL) {
usb_mtp_queue_result(s, RES_INVALID_OBJECT_HANDLE,
c->trans, 0, 0, 0, 0);
return;
}
if (o->format != FMT_ASSOCIATION) {
usb_mtp_queue_result(s, RES_INVALID_PARENT_OBJECT,
c->trans, 0, 0, 0, 0);
return;
}
usb_mtp_object_readdir(s, o);
if (c->code == CMD_GET_NUM_OBJECTS) {
trace_usb_mtp_op_get_num_objects(s->dev.addr, o->handle, o->path);
nres = 1;
res0 = o->nchildren;
} else {
data_in = usb_mtp_get_object_handles(s, c, o);
}
break;
case CMD_GET_OBJECT_INFO:
o = usb_mtp_object_lookup(s, c->argv[0]);
if (o == NULL) {
usb_mtp_queue_result(s, RES_INVALID_OBJECT_HANDLE,
c->trans, 0, 0, 0, 0);
return;
}
data_in = usb_mtp_get_object_info(s, c, o);
break;
case CMD_GET_OBJECT:
o = usb_mtp_object_lookup(s, c->argv[0]);
if (o == NULL) {
usb_mtp_queue_result(s, RES_INVALID_OBJECT_HANDLE,
c->trans, 0, 0, 0, 0);
return;
}
if (o->format == FMT_ASSOCIATION) {
usb_mtp_queue_result(s, RES_INVALID_OBJECT_HANDLE,
c->trans, 0, 0, 0, 0);
return;
}
data_in = usb_mtp_get_object(s, c, o);
if (data_in == NULL) {
usb_mtp_queue_result(s, RES_GENERAL_ERROR,
c->trans, 0, 0, 0, 0);
return;
}
break;
case CMD_DELETE_OBJECT:
usb_mtp_object_delete(s, c->argv[0], c->argv[1], c->trans);
return;
case CMD_GET_PARTIAL_OBJECT:
o = usb_mtp_object_lookup(s, c->argv[0]);
if (o == NULL) {
usb_mtp_queue_result(s, RES_INVALID_OBJECT_HANDLE,
c->trans, 0, 0, 0, 0);
return;
}
if (o->format == FMT_ASSOCIATION) {
usb_mtp_queue_result(s, RES_INVALID_OBJECT_HANDLE,
c->trans, 0, 0, 0, 0);
return;
}
data_in = usb_mtp_get_partial_object(s, c, o);
if (data_in == NULL) {
usb_mtp_queue_result(s, RES_GENERAL_ERROR,
c->trans, 0, 0, 0, 0);
return;
}
nres = 1;
res0 = data_in->length;
break;
case CMD_SEND_OBJECT_INFO:
/* Return error if store is read-only */
if (!FLAG_SET(s, MTP_FLAG_WRITABLE)) {
usb_mtp_queue_result(s, RES_STORE_READ_ONLY,
c->trans, 0, 0, 0, 0);
} else if (c->argv[0] && (c->argv[0] != QEMU_STORAGE_ID)) {
/* First parameter points to storage id or is 0 */
usb_mtp_queue_result(s, RES_STORE_NOT_AVAILABLE, c->trans,
0, 0, 0, 0);
} else if (c->argv[1] && !c->argv[0]) {
/* If second parameter is specified, first must also be specified */
usb_mtp_queue_result(s, RES_DESTINATION_UNSUPPORTED, c->trans,
0, 0, 0, 0);
} else {
uint32_t handle = c->argv[1];
if (handle == 0xFFFFFFFF || handle == 0) {
/* root object */
o = QTAILQ_FIRST(&s->objects);
} else {
o = usb_mtp_object_lookup(s, handle);
}
if (o == NULL) {
usb_mtp_queue_result(s, RES_INVALID_OBJECT_HANDLE, c->trans,
0, 0, 0, 0);
} else if (o->format != FMT_ASSOCIATION) {
usb_mtp_queue_result(s, RES_INVALID_PARENT_OBJECT, c->trans,
0, 0, 0, 0);
}
}
if (o) {
s->dataset.parent_handle = o->handle;
}
s->data_out = usb_mtp_data_alloc(c);
return;
case CMD_SEND_OBJECT:
if (!FLAG_SET(s, MTP_FLAG_WRITABLE)) {
usb_mtp_queue_result(s, RES_STORE_READ_ONLY,
c->trans, 0, 0, 0, 0);
return;
}
if (!s->write_pending) {
usb_mtp_queue_result(s, RES_INVALID_OBJECTINFO,
c->trans, 0, 0, 0, 0);
return;
}
s->data_out = usb_mtp_data_alloc(c);
return;
case CMD_GET_OBJECT_PROPS_SUPPORTED:
if (c->argv[0] != FMT_UNDEFINED_OBJECT &&
c->argv[0] != FMT_ASSOCIATION) {
usb_mtp_queue_result(s, RES_INVALID_OBJECT_FORMAT_CODE,
c->trans, 0, 0, 0, 0);
return;
}
data_in = usb_mtp_get_object_props_supported(s, c);
break;
case CMD_GET_OBJECT_PROP_DESC:
if (c->argv[1] != FMT_UNDEFINED_OBJECT &&
c->argv[1] != FMT_ASSOCIATION) {
usb_mtp_queue_result(s, RES_INVALID_OBJECT_FORMAT_CODE,
c->trans, 0, 0, 0, 0);
return;
}
data_in = usb_mtp_get_object_prop_desc(s, c);
if (data_in == NULL) {
usb_mtp_queue_result(s, RES_INVALID_OBJECT_PROP_CODE,
c->trans, 0, 0, 0, 0);
return;
}
break;
case CMD_GET_OBJECT_PROP_VALUE:
o = usb_mtp_object_lookup(s, c->argv[0]);
if (o == NULL) {
usb_mtp_queue_result(s, RES_INVALID_OBJECT_HANDLE,
c->trans, 0, 0, 0, 0);
return;
}
data_in = usb_mtp_get_object_prop_value(s, c, o);
if (data_in == NULL) {
usb_mtp_queue_result(s, RES_INVALID_OBJECT_PROP_CODE,
c->trans, 0, 0, 0, 0);
return;
}
break;
default:
trace_usb_mtp_op_unknown(s->dev.addr, c->code);
usb_mtp_queue_result(s, RES_OPERATION_NOT_SUPPORTED,
c->trans, 0, 0, 0, 0);
return;
}
/* return results on success */
if (data_in) {
assert(s->data_in == NULL);
s->data_in = data_in;
}
usb_mtp_queue_result(s, RES_OK, c->trans, nres, res0, 0, 0);
}
/* ----------------------------------------------------------------------- */
static void usb_mtp_handle_reset(USBDevice *dev)
{
MTPState *s = USB_MTP(dev);
trace_usb_mtp_reset(s->dev.addr);
usb_mtp_file_monitor_cleanup(s);
usb_mtp_object_free(s, QTAILQ_FIRST(&s->objects));
s->session = 0;
usb_mtp_data_free(s->data_in);
s->data_in = NULL;
usb_mtp_data_free(s->data_out);
s->data_out = NULL;
g_free(s->result);
s->result = NULL;
}
static void usb_mtp_handle_control(USBDevice *dev, USBPacket *p,
int request, int value, int index,
int length, uint8_t *data)
{
int ret;
MTPState *s = USB_MTP(dev);
uint16_t *event = (uint16_t *)data;
switch (request) {
case ClassInterfaceOutRequest | 0x64:
if (*event == EVT_CANCEL_TRANSACTION) {
g_free(s->result);
s->result = NULL;
usb_mtp_data_free(s->data_in);
s->data_in = NULL;
if (s->write_pending) {
g_free(s->dataset.filename);
s->write_pending = false;
s->dataset.size = 0;
}
usb_mtp_data_free(s->data_out);
s->data_out = NULL;
} else {
p->status = USB_RET_STALL;
}
break;
default:
ret = usb_desc_handle_control(dev, p, request,
value, index, length, data);
if (ret >= 0) {
return;
}
}
trace_usb_mtp_stall(dev->addr, "unknown control request");
}
static void usb_mtp_cancel_packet(USBDevice *dev, USBPacket *p)
{
/* we don't use async packets, so this should never be called */
fprintf(stderr, "%s\n", __func__);
}
static char *utf16_to_str(uint8_t len, uint16_t *arr)
{
wchar_t *wstr = g_new0(wchar_t, len + 1);
int count, dlen;
char *dest;
for (count = 0; count < len; count++) {
/* FIXME: not working for surrogate pairs */
wstr[count] = (wchar_t)arr[count];
}
wstr[count] = 0;
dlen = wcstombs(NULL, wstr, 0) + 1;
dest = g_malloc(dlen);
wcstombs(dest, wstr, dlen);
g_free(wstr);
return dest;
}
/* Wrapper around write, returns 0 on failure */
static uint64_t write_retry(int fd, void *buf, uint64_t size, off_t offset)
{
uint64_t ret = 0;
if (lseek(fd, offset, SEEK_SET) < 0) {
goto done;
}
ret = qemu_write_full(fd, buf, size);
done:
return ret;
}
static int usb_mtp_update_object(MTPObject *parent, char *name)
{
int ret = -1;
MTPObject *o =
usb_mtp_object_lookup_name(parent, name, strlen(name));
if (o) {
ret = lstat(o->path, &o->stat);
}
return ret;
}
static int usb_mtp_write_data(MTPState *s)
{
MTPData *d = s->data_out;
MTPObject *parent =
usb_mtp_object_lookup(s, s->dataset.parent_handle);
char *path = NULL;
uint64_t rc;
mode_t mask = 0644;
int ret = 0;
assert(d != NULL);
switch (d->write_status) {
case WRITE_START:
if (!parent || !s->write_pending) {
usb_mtp_queue_result(s, RES_INVALID_OBJECTINFO, d->trans,
0, 0, 0, 0);
return 1;
}
if (s->dataset.filename) {
path = g_strdup_printf("%s/%s", parent->path, s->dataset.filename);
if (s->dataset.format == FMT_ASSOCIATION) {
ret = mkdir(path, mask);
goto free;
}
d->fd = open(path, O_CREAT | O_WRONLY |
O_CLOEXEC | O_NOFOLLOW, mask);
if (d->fd == -1) {
usb_mtp_queue_result(s, RES_STORE_FULL, d->trans,
0, 0, 0, 0);
goto done;
}
/* Return success if initiator sent 0 sized data */
if (!s->dataset.size) {
goto success;
}
if (d->length != MTP_WRITE_BUF_SZ && !d->pending) {
d->write_status = WRITE_END;
}
}
/* fall through */
case WRITE_CONTINUE:
case WRITE_END:
rc = write_retry(d->fd, d->data, d->data_offset,
d->offset - d->data_offset);
if (rc != d->data_offset) {
usb_mtp_queue_result(s, RES_STORE_FULL, d->trans,
0, 0, 0, 0);
goto done;
}
if (d->write_status != WRITE_END) {
g_free(path);
return ret;
} else {
/*
* Return an incomplete transfer if file size doesn't match
* for < 4G file or if lstat fails which will result in an incorrect
* file size
*/
if ((s->dataset.size != 0xFFFFFFFF &&
d->offset != s->dataset.size) ||
usb_mtp_update_object(parent, s->dataset.filename)) {
usb_mtp_queue_result(s, RES_INCOMPLETE_TRANSFER, d->trans,
0, 0, 0, 0);
goto done;
}
}
}
success:
usb_mtp_queue_result(s, RES_OK, d->trans,
0, 0, 0, 0);
done:
/*
* The write dataset is kept around and freed only
* on success or if another write request comes in
*/
if (d->fd != -1) {
close(d->fd);
d->fd = -1;
}
free:
g_free(s->dataset.filename);
s->dataset.size = 0;
g_free(path);
s->write_pending = false;
return ret;
}
static void usb_mtp_write_metadata(MTPState *s, uint64_t dlen)
{
MTPData *d = s->data_out;
ObjectInfo *dataset = (ObjectInfo *)d->data;
char *filename;
MTPObject *o;
MTPObject *p = usb_mtp_object_lookup(s, s->dataset.parent_handle);
uint32_t next_handle = s->next_handle;
assert(!s->write_pending);
assert(p != NULL);
filename = utf16_to_str(MIN(dataset->length,
dlen - offsetof(ObjectInfo, filename)),
dataset->filename);
if (strchr(filename, '/')) {
usb_mtp_queue_result(s, RES_PARAMETER_NOT_SUPPORTED, d->trans,
0, 0, 0, 0);
g_free(filename);
return;
}
o = usb_mtp_object_lookup_name(p, filename, dataset->length);
if (o != NULL) {
next_handle = o->handle;
}
s->dataset.filename = filename;
s->dataset.format = dataset->format;
s->dataset.size = dataset->size;
s->write_pending = true;
if (s->dataset.format == FMT_ASSOCIATION) {
if (usb_mtp_write_data(s)) {
/* next_handle will be allocated to the newly created dir */
usb_mtp_queue_result(s, RES_STORE_FULL, d->trans,
0, 0, 0, 0);
return;
}
}
usb_mtp_queue_result(s, RES_OK, d->trans, 3, QEMU_STORAGE_ID,
s->dataset.parent_handle, next_handle);
}
static void usb_mtp_get_data(MTPState *s, mtp_container *container,
USBPacket *p)
{
MTPData *d = s->data_out;
uint64_t dlen;
uint32_t data_len = p->iov.size;
uint64_t total_len;
if (!d) {
usb_mtp_queue_result(s, RES_INVALID_OBJECTINFO, 0,
0, 0, 0, 0);
return;
}
if (d->first) {
/* Total length of incoming data */
total_len = cpu_to_le32(container->length) - sizeof(mtp_container);
/* Length of data in this packet */
data_len -= sizeof(mtp_container);
if (total_len < MTP_WRITE_BUF_SZ) {
usb_mtp_realloc(d, total_len);
d->length += total_len;
} else {
usb_mtp_realloc(d, MTP_WRITE_BUF_SZ - sizeof(mtp_container));
d->length += MTP_WRITE_BUF_SZ - sizeof(mtp_container);
}
d->offset = 0;
d->first = false;
d->pending = false;
d->data_offset = 0;
d->write_status = WRITE_START;
}
if (d->pending) {
memset(d->data, 0, d->length);
if (d->length != MTP_WRITE_BUF_SZ) {
usb_mtp_realloc(d, MTP_WRITE_BUF_SZ - d->length);
d->length += (MTP_WRITE_BUF_SZ - d->length);
}
d->pending = false;
d->write_status = WRITE_CONTINUE;
d->data_offset = 0;
}
if (d->length - d->data_offset > data_len) {
dlen = data_len;
} else {
dlen = d->length - d->data_offset;
}
switch (d->code) {
case CMD_SEND_OBJECT_INFO:
usb_packet_copy(p, d->data + d->data_offset, dlen);
d->offset += dlen;
d->data_offset += dlen;
if (d->data_offset == d->length) {
/* The operation might have already failed */
if (!s->result) {
usb_mtp_write_metadata(s, dlen);
}
usb_mtp_data_free(s->data_out);
s->data_out = NULL;
return;
}
break;
case CMD_SEND_OBJECT:
usb_packet_copy(p, d->data + d->data_offset, dlen);
d->offset += dlen;
d->data_offset += dlen;
if ((p->iov.size % 64) || !p->iov.size) {
assert((s->dataset.size == 0xFFFFFFFF) ||
(s->dataset.size == d->offset));
if (d->length == MTP_WRITE_BUF_SZ) {
d->write_status = WRITE_END;
} else {
d->write_status = WRITE_START;
}
usb_mtp_write_data(s);
usb_mtp_data_free(s->data_out);
s->data_out = NULL;
return;
}
if (d->data_offset == d->length) {
d->pending = true;
usb_mtp_write_data(s);
}
break;
default:
p->status = USB_RET_STALL;
return;
}
}
static void usb_mtp_handle_data(USBDevice *dev, USBPacket *p)
{
MTPState *s = USB_MTP(dev);
MTPControl cmd;
mtp_container container;
uint32_t params[5];
uint16_t container_type;
int i, rc;
switch (p->ep->nr) {
case EP_DATA_IN:
if (s->data_out != NULL) {
/* guest bug */
trace_usb_mtp_stall(s->dev.addr, "awaiting data-out");
p->status = USB_RET_STALL;
return;
}
if (p->iov.size < sizeof(container)) {
trace_usb_mtp_stall(s->dev.addr, "packet too small");
p->status = USB_RET_STALL;
return;
}
if (s->data_in != NULL) {
MTPData *d = s->data_in;
uint64_t dlen = d->length - d->offset;
if (d->first) {
trace_usb_mtp_data_in(s->dev.addr, d->trans, d->length);
if (d->length + sizeof(container) > 0xFFFFFFFF) {
container.length = cpu_to_le32(0xFFFFFFFF);
} else {
container.length =
cpu_to_le32(d->length + sizeof(container));
}
container.type = cpu_to_le16(TYPE_DATA);
container.code = cpu_to_le16(d->code);
container.trans = cpu_to_le32(d->trans);
usb_packet_copy(p, &container, sizeof(container));
d->first = false;
if (dlen > p->iov.size - sizeof(container)) {
dlen = p->iov.size - sizeof(container);
}
} else {
if (dlen > p->iov.size) {
dlen = p->iov.size;
}
}
if (d->fd == -1) {
usb_packet_copy(p, d->data + d->offset, dlen);
} else {
if (d->alloc < p->iov.size) {
d->alloc = p->iov.size;
d->data = g_realloc(d->data, d->alloc);
}
rc = read(d->fd, d->data, dlen);
if (rc != dlen) {
memset(d->data, 0, dlen);
s->result->code = RES_INCOMPLETE_TRANSFER;
}
usb_packet_copy(p, d->data, dlen);
}
d->offset += dlen;
if (d->offset == d->length) {
usb_mtp_data_free(s->data_in);
s->data_in = NULL;
}
} else if (s->result != NULL) {
MTPControl *r = s->result;
int length = sizeof(container) + r->argc * sizeof(uint32_t);
if (r->code == RES_OK) {
trace_usb_mtp_success(s->dev.addr, r->trans,
(r->argc > 0) ? r->argv[0] : 0,
(r->argc > 1) ? r->argv[1] : 0);
} else {
trace_usb_mtp_error(s->dev.addr, r->code, r->trans,
(r->argc > 0) ? r->argv[0] : 0,
(r->argc > 1) ? r->argv[1] : 0);
}
container.length = cpu_to_le32(length);
container.type = cpu_to_le16(TYPE_RESPONSE);
container.code = cpu_to_le16(r->code);
container.trans = cpu_to_le32(r->trans);
for (i = 0; i < r->argc; i++) {
params[i] = cpu_to_le32(r->argv[i]);
}
usb_packet_copy(p, &container, sizeof(container));
usb_packet_copy(p, &params, length - sizeof(container));
g_free(s->result);
s->result = NULL;
}
break;
case EP_DATA_OUT:
if (p->iov.size < sizeof(container)) {
trace_usb_mtp_stall(s->dev.addr, "packet too small");
p->status = USB_RET_STALL;
return;
}
if ((s->data_out != NULL) && !s->data_out->first) {
container_type = TYPE_DATA;
} else {
usb_packet_copy(p, &container, sizeof(container));
container_type = le16_to_cpu(container.type);
}
switch (container_type) {
case TYPE_COMMAND:
if (s->data_in || s->data_out || s->result) {
trace_usb_mtp_stall(s->dev.addr, "transaction inflight");
p->status = USB_RET_STALL;
return;
}
cmd.code = le16_to_cpu(container.code);
cmd.argc = (le32_to_cpu(container.length) - sizeof(container))
/ sizeof(uint32_t);
cmd.trans = le32_to_cpu(container.trans);
if (cmd.argc > ARRAY_SIZE(cmd.argv)) {
cmd.argc = ARRAY_SIZE(cmd.argv);
}
if (p->iov.size < sizeof(container) + cmd.argc * sizeof(uint32_t)) {
trace_usb_mtp_stall(s->dev.addr, "packet too small");
p->status = USB_RET_STALL;
return;
}
usb_packet_copy(p, &params, cmd.argc * sizeof(uint32_t));
for (i = 0; i < cmd.argc; i++) {
cmd.argv[i] = le32_to_cpu(params[i]);
}
trace_usb_mtp_command(s->dev.addr, cmd.code, cmd.trans,
(cmd.argc > 0) ? cmd.argv[0] : 0,
(cmd.argc > 1) ? cmd.argv[1] : 0,
(cmd.argc > 2) ? cmd.argv[2] : 0,
(cmd.argc > 3) ? cmd.argv[3] : 0,
(cmd.argc > 4) ? cmd.argv[4] : 0);
usb_mtp_command(s, &cmd);
break;
case TYPE_DATA:
/* One of the previous transfers has already errored but the
* responder is still sending data associated with it
*/
if (s->result != NULL) {
return;
}
usb_mtp_get_data(s, &container, p);
break;
default:
/* not needed as long as the mtp device is read-only */
p->status = USB_RET_STALL;
return;
}
break;
case EP_EVENT:
if (!QTAILQ_EMPTY(&s->events)) {
struct MTPMonEntry *e = QTAILQ_LAST(&s->events);
uint32_t handle;
int len = sizeof(container) + sizeof(uint32_t);
if (p->iov.size < len) {
trace_usb_mtp_stall(s->dev.addr,
"packet too small to send event");
p->status = USB_RET_STALL;
return;
}
QTAILQ_REMOVE(&s->events, e, next);
container.length = cpu_to_le32(len);
container.type = cpu_to_le32(TYPE_EVENT);
container.code = cpu_to_le16(e->event);
container.trans = 0; /* no trans specific events */
handle = cpu_to_le32(e->handle);
usb_packet_copy(p, &container, sizeof(container));
usb_packet_copy(p, &handle, sizeof(uint32_t));
g_free(e);
return;
}
p->status = USB_RET_NAK;
return;
default:
trace_usb_mtp_stall(s->dev.addr, "invalid endpoint");
p->status = USB_RET_STALL;
return;
}
if (p->actual_length == 0) {
trace_usb_mtp_nak(s->dev.addr, p->ep->nr);
p->status = USB_RET_NAK;
return;
} else {
trace_usb_mtp_xfer(s->dev.addr, p->ep->nr, p->actual_length,
p->iov.size);
return;
}
}
static void usb_mtp_realize(USBDevice *dev, Error **errp)
{
MTPState *s = USB_MTP(dev);
usb_desc_create_serial(dev);
usb_desc_init(dev);
QTAILQ_INIT(&s->objects);
if (s->desc == NULL) {
if (s->root == NULL) {
error_setg(errp, "usb-mtp: rootdir property must be configured");
return;
}
s->desc = strrchr(s->root, '/');
if (s->desc && s->desc[0]) {
s->desc = g_strdup(s->desc + 1);
} else {
s->desc = g_strdup("none");
}
}
/* Mark store as RW */
if (!s->readonly) {
s->flags |= (1 << MTP_FLAG_WRITABLE);
}
}
static const VMStateDescription vmstate_usb_mtp = {
.name = "usb-mtp",
.unmigratable = 1,
.version_id = 1,
.minimum_version_id = 1,
.fields = (VMStateField[]) {
VMSTATE_USB_DEVICE(dev, MTPState),
VMSTATE_END_OF_LIST()
}
};
static Property mtp_properties[] = {
DEFINE_PROP_STRING("rootdir", MTPState, root),
DEFINE_PROP_STRING("desc", MTPState, desc),
DEFINE_PROP_BOOL("readonly", MTPState, readonly, true),
DEFINE_PROP_END_OF_LIST(),
};
static void usb_mtp_class_initfn(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
USBDeviceClass *uc = USB_DEVICE_CLASS(klass);
uc->realize = usb_mtp_realize;
uc->product_desc = "QEMU USB MTP";
uc->usb_desc = &desc;
uc->cancel_packet = usb_mtp_cancel_packet;
uc->handle_attach = usb_desc_attach;
uc->handle_reset = usb_mtp_handle_reset;
uc->handle_control = usb_mtp_handle_control;
uc->handle_data = usb_mtp_handle_data;
set_bit(DEVICE_CATEGORY_STORAGE, dc->categories);
dc->desc = "USB Media Transfer Protocol device";
dc->fw_name = "mtp";
dc->vmsd = &vmstate_usb_mtp;
dc->props = mtp_properties;
}
static TypeInfo mtp_info = {
.name = TYPE_USB_MTP,
.parent = TYPE_USB_DEVICE,
.instance_size = sizeof(MTPState),
.class_init = usb_mtp_class_initfn,
};
static void usb_mtp_register_types(void)
{
type_register_static(&mtp_info);
}
type_init(usb_mtp_register_types)
Reference in New Issue View Git Blame Copy Permalink