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qemu/hw/usb/bus.c
Benjamin David Lunt 5e02a4fdeb hw/usb/bus.c: PCAP adding 0xA in Windows version 
Since Windows text files use CRLFs for all \n, the Windows version of QEMU
inserts a CR in the PCAP stream when a LF is encountered when using USB PCAP
files. This is due to the fact that the PCAP file is opened as TEXT instead
of BINARY.

To show an example, when using a very common protocol to USB disks, the BBB
protocol uses a 10-byte command packet. For example, the READ_CAPACITY(10)
command will have a command block length of 10 (0xA). When this 10-byte
command (part of the 31-byte CBW) is placed into the PCAP file, the Windows
file manager inserts a 0xD before the 0xA, turning the 31-byte CBW into a
32-byte CBW.

Actual CBW:
  0040 55 53 42 43 01 00 00 00 08 00 00 00 80 00 0a 25 USBC...........%
  0050 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00       ...............

PCAP CBW
  0040 55 53 42 43 01 00 00 00 08 00 00 00 80 00 0d 0a USBC............
  0050 25 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 %..............

I believe simply opening the PCAP file as BINARY instead of TEXT will fix
this issue.

Resolves: https://bugs.launchpad.net/qemu/+bug/2054889
Signed-off-by: Benjamin David Lunt <benlunt@fysnet.net>
Message-ID: <000101da6823$ce1bbf80$6a533e80$@fysnet.net>
[thuth: Break long line to avoid checkpatch.pl error]
Signed-off-by: Thomas Huth <thuth@redhat.com>
2024-03-01 08:27:33 +01:00

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#include "qemu/osdep.h"
#include "hw/qdev-properties.h"
#include "hw/usb.h"
#include "qapi/error.h"
#include "qapi/qapi-commands-machine.h"
#include "qapi/type-helpers.h"
#include "qemu/error-report.h"
#include "qemu/module.h"
#include "sysemu/sysemu.h"
#include "migration/vmstate.h"
#include "monitor/monitor.h"
#include "trace.h"
#include "qemu/cutils.h"
static void usb_bus_dev_print(Monitor *mon, DeviceState *qdev, int indent);
static char *usb_get_dev_path(DeviceState *dev);
static char *usb_get_fw_dev_path(DeviceState *qdev);
static void usb_qdev_unrealize(DeviceState *qdev);
static Property usb_props[] = {
DEFINE_PROP_STRING("port", USBDevice, port_path),
DEFINE_PROP_STRING("serial", USBDevice, serial),
DEFINE_PROP_BIT("msos-desc", USBDevice, flags,
USB_DEV_FLAG_MSOS_DESC_ENABLE, true),
DEFINE_PROP_STRING("pcap", USBDevice, pcap_filename),
DEFINE_PROP_END_OF_LIST()
};
static void usb_bus_class_init(ObjectClass *klass, void *data)
{
BusClass *k = BUS_CLASS(klass);
HotplugHandlerClass *hc = HOTPLUG_HANDLER_CLASS(klass);
k->print_dev = usb_bus_dev_print;
k->get_dev_path = usb_get_dev_path;
k->get_fw_dev_path = usb_get_fw_dev_path;
hc->unplug = qdev_simple_device_unplug_cb;
}
static const TypeInfo usb_bus_info = {
.name = TYPE_USB_BUS,
.parent = TYPE_BUS,
.instance_size = sizeof(USBBus),
.class_init = usb_bus_class_init,
.interfaces = (InterfaceInfo[]) {
{ TYPE_HOTPLUG_HANDLER },
{ }
}
};
static int next_usb_bus = 0;
static QTAILQ_HEAD(, USBBus) busses = QTAILQ_HEAD_INITIALIZER(busses);
static int usb_device_post_load(void *opaque, int version_id)
{
USBDevice *dev = opaque;
if (dev->state == USB_STATE_NOTATTACHED) {
dev->attached = false;
} else {
dev->attached = true;
}
return 0;
}
const VMStateDescription vmstate_usb_device = {
.name = "USBDevice",
.version_id = 1,
.minimum_version_id = 1,
.post_load = usb_device_post_load,
.fields = (const VMStateField[]) {
VMSTATE_UINT8(addr, USBDevice),
VMSTATE_INT32(state, USBDevice),
VMSTATE_INT32(remote_wakeup, USBDevice),
VMSTATE_INT32(setup_state, USBDevice),
VMSTATE_INT32(setup_len, USBDevice),
VMSTATE_INT32(setup_index, USBDevice),
VMSTATE_UINT8_ARRAY(setup_buf, USBDevice, 8),
VMSTATE_END_OF_LIST(),
}
};
void usb_bus_new(USBBus *bus, size_t bus_size,
USBBusOps *ops, DeviceState *host)
{
qbus_init(bus, bus_size, TYPE_USB_BUS, host, NULL);
qbus_set_bus_hotplug_handler(BUS(bus));
bus->ops = ops;
bus->busnr = next_usb_bus++;
QTAILQ_INIT(&bus->free);
QTAILQ_INIT(&bus->used);
QTAILQ_INSERT_TAIL(&busses, bus, next);
}
void usb_bus_release(USBBus *bus)
{
assert(next_usb_bus > 0);
QTAILQ_REMOVE(&busses, bus, next);
}
static void usb_device_realize(USBDevice *dev, Error **errp)
{
USBDeviceClass *klass = USB_DEVICE_GET_CLASS(dev);
if (klass->realize) {
klass->realize(dev, errp);
}
}
USBDevice *usb_device_find_device(USBDevice *dev, uint8_t addr)
{
USBDeviceClass *klass = USB_DEVICE_GET_CLASS(dev);
if (klass->find_device) {
return klass->find_device(dev, addr);
}
return NULL;
}
static void usb_device_unrealize(USBDevice *dev)
{
USBDeviceClass *klass = USB_DEVICE_GET_CLASS(dev);
if (klass->unrealize) {
klass->unrealize(dev);
}
}
void usb_device_cancel_packet(USBDevice *dev, USBPacket *p)
{
USBDeviceClass *klass = USB_DEVICE_GET_CLASS(dev);
if (klass->cancel_packet) {
klass->cancel_packet(dev, p);
}
}
void usb_device_handle_attach(USBDevice *dev)
{
USBDeviceClass *klass = USB_DEVICE_GET_CLASS(dev);
if (klass->handle_attach) {
klass->handle_attach(dev);
}
}
void usb_device_handle_reset(USBDevice *dev)
{
USBDeviceClass *klass = USB_DEVICE_GET_CLASS(dev);
if (klass->handle_reset) {
klass->handle_reset(dev);
}
}
void usb_device_handle_control(USBDevice *dev, USBPacket *p, int request,
int value, int index, int length, uint8_t *data)
{
USBDeviceClass *klass = USB_DEVICE_GET_CLASS(dev);
if (klass->handle_control) {
klass->handle_control(dev, p, request, value, index, length, data);
}
}
void usb_device_handle_data(USBDevice *dev, USBPacket *p)
{
USBDeviceClass *klass = USB_DEVICE_GET_CLASS(dev);
if (klass->handle_data) {
klass->handle_data(dev, p);
}
}
const char *usb_device_get_product_desc(USBDevice *dev)
{
USBDeviceClass *klass = USB_DEVICE_GET_CLASS(dev);
return klass->product_desc;
}
const USBDesc *usb_device_get_usb_desc(USBDevice *dev)
{
USBDeviceClass *klass = USB_DEVICE_GET_CLASS(dev);
if (dev->usb_desc) {
return dev->usb_desc;
}
return klass->usb_desc;
}
void usb_device_set_interface(USBDevice *dev, int interface,
int alt_old, int alt_new)
{
USBDeviceClass *klass = USB_DEVICE_GET_CLASS(dev);
if (klass->set_interface) {
klass->set_interface(dev, interface, alt_old, alt_new);
}
}
void usb_device_flush_ep_queue(USBDevice *dev, USBEndpoint *ep)
{
USBDeviceClass *klass = USB_DEVICE_GET_CLASS(dev);
if (klass->flush_ep_queue) {
klass->flush_ep_queue(dev, ep);
}
}
void usb_device_ep_stopped(USBDevice *dev, USBEndpoint *ep)
{
USBDeviceClass *klass = USB_DEVICE_GET_CLASS(dev);
if (klass->ep_stopped) {
klass->ep_stopped(dev, ep);
}
}
int usb_device_alloc_streams(USBDevice *dev, USBEndpoint **eps, int nr_eps,
int streams)
{
USBDeviceClass *klass = USB_DEVICE_GET_CLASS(dev);
if (klass->alloc_streams) {
return klass->alloc_streams(dev, eps, nr_eps, streams);
}
return 0;
}
void usb_device_free_streams(USBDevice *dev, USBEndpoint **eps, int nr_eps)
{
USBDeviceClass *klass = USB_DEVICE_GET_CLASS(dev);
if (klass->free_streams) {
klass->free_streams(dev, eps, nr_eps);
}
}
static void usb_qdev_realize(DeviceState *qdev, Error **errp)
{
USBDevice *dev = USB_DEVICE(qdev);
Error *local_err = NULL;
pstrcpy(dev->product_desc, sizeof(dev->product_desc),
usb_device_get_product_desc(dev));
dev->auto_attach = 1;
QLIST_INIT(&dev->strings);
usb_ep_init(dev);
usb_claim_port(dev, &local_err);
if (local_err) {
error_propagate(errp, local_err);
return;
}
usb_device_realize(dev, &local_err);
if (local_err) {
usb_release_port(dev);
error_propagate(errp, local_err);
return;
}
if (dev->auto_attach) {
usb_device_attach(dev, &local_err);
if (local_err) {
usb_qdev_unrealize(qdev);
error_propagate(errp, local_err);
return;
}
}
if (dev->pcap_filename) {
int fd = qemu_open_old(dev->pcap_filename,
O_CREAT | O_WRONLY | O_TRUNC | O_BINARY, 0666);
if (fd < 0) {
error_setg(errp, "open %s failed", dev->pcap_filename);
usb_qdev_unrealize(qdev);
return;
}
dev->pcap = fdopen(fd, "wb");
usb_pcap_init(dev->pcap);
}
}
static void usb_qdev_unrealize(DeviceState *qdev)
{
USBDevice *dev = USB_DEVICE(qdev);
USBDescString *s, *next;
QLIST_FOREACH_SAFE(s, &dev->strings, next, next) {
QLIST_REMOVE(s, next);
g_free(s->str);
g_free(s);
}
if (dev->pcap) {
fclose(dev->pcap);
}
if (dev->attached) {
usb_device_detach(dev);
}
usb_device_unrealize(dev);
if (dev->port) {
usb_release_port(dev);
}
}
typedef struct LegacyUSBFactory
{
const char *name;
const char *usbdevice_name;
USBDevice *(*usbdevice_init)(void);
} LegacyUSBFactory;
static GSList *legacy_usb_factory;
void usb_legacy_register(const char *typename, const char *usbdevice_name,
USBDevice *(*usbdevice_init)(void))
{
if (usbdevice_name) {
LegacyUSBFactory *f = g_malloc0(sizeof(*f));
f->name = typename;
f->usbdevice_name = usbdevice_name;
f->usbdevice_init = usbdevice_init;
legacy_usb_factory = g_slist_append(legacy_usb_factory, f);
}
}
static void usb_fill_port(USBPort *port, void *opaque, int index,
USBPortOps *ops, int speedmask)
{
port->opaque = opaque;
port->index = index;
port->ops = ops;
port->speedmask = speedmask;
usb_port_location(port, NULL, index + 1);
}
void usb_register_port(USBBus *bus, USBPort *port, void *opaque, int index,
USBPortOps *ops, int speedmask)
{
usb_fill_port(port, opaque, index, ops, speedmask);
QTAILQ_INSERT_TAIL(&bus->free, port, next);
bus->nfree++;
}
void usb_register_companion(const char *masterbus, USBPort *ports[],
uint32_t portcount, uint32_t firstport,
void *opaque, USBPortOps *ops, int speedmask,
Error **errp)
{
USBBus *bus;
int i;
QTAILQ_FOREACH(bus, &busses, next) {
if (strcmp(bus->qbus.name, masterbus) == 0) {
break;
}
}
if (!bus) {
error_setg(errp, "USB bus '%s' not found", masterbus);
return;
}
if (!bus->ops->register_companion) {
error_setg(errp, "Can't use USB bus '%s' as masterbus,"
" it doesn't support companion controllers",
masterbus);
return;
}
for (i = 0; i < portcount; i++) {
usb_fill_port(ports[i], opaque, i, ops, speedmask);
}
bus->ops->register_companion(bus, ports, portcount, firstport, errp);
}
void usb_port_location(USBPort *downstream, USBPort *upstream, int portnr)
{
if (upstream) {
int l = snprintf(downstream->path, sizeof(downstream->path), "%s.%d",
upstream->path, portnr);
/* Max string is nn.nn.nn.nn.nn, which fits in 16 bytes */
assert(l < sizeof(downstream->path));
downstream->hubcount = upstream->hubcount + 1;
} else {
snprintf(downstream->path, sizeof(downstream->path), "%d", portnr);
downstream->hubcount = 0;
}
}
void usb_unregister_port(USBBus *bus, USBPort *port)
{
if (port->dev) {
object_unparent(OBJECT(port->dev));
}
QTAILQ_REMOVE(&bus->free, port, next);
bus->nfree--;
}
void usb_claim_port(USBDevice *dev, Error **errp)
{
USBBus *bus = usb_bus_from_device(dev);
USBPort *port;
USBDevice *hub;
assert(dev->port == NULL);
if (dev->port_path) {
QTAILQ_FOREACH(port, &bus->free, next) {
if (strcmp(port->path, dev->port_path) == 0) {
break;
}
}
if (port == NULL) {
error_setg(errp, "usb port %s (bus %s) not found (in use?)",
dev->port_path, bus->qbus.name);
return;
}
} else {
if (bus->nfree == 1 && strcmp(object_get_typename(OBJECT(dev)), "usb-hub") != 0) {
/* Create a new hub and chain it on */
hub = usb_try_new("usb-hub");
if (hub) {
usb_realize_and_unref(hub, bus, NULL);
}
}
if (bus->nfree == 0) {
error_setg(errp, "tried to attach usb device %s to a bus "
"with no free ports", dev->product_desc);
return;
}
port = QTAILQ_FIRST(&bus->free);
}
trace_usb_port_claim(bus->busnr, port->path);
QTAILQ_REMOVE(&bus->free, port, next);
bus->nfree--;
dev->port = port;
port->dev = dev;
QTAILQ_INSERT_TAIL(&bus->used, port, next);
bus->nused++;
}
void usb_release_port(USBDevice *dev)
{
USBBus *bus = usb_bus_from_device(dev);
USBPort *port = dev->port;
assert(port != NULL);
trace_usb_port_release(bus->busnr, port->path);
QTAILQ_REMOVE(&bus->used, port, next);
bus->nused--;
dev->port = NULL;
port->dev = NULL;
QTAILQ_INSERT_TAIL(&bus->free, port, next);
bus->nfree++;
}
static void usb_mask_to_str(char *dest, size_t size,
unsigned int speedmask)
{
static const struct {
unsigned int mask;
const char *name;
} speeds[] = {
{ .mask = USB_SPEED_MASK_FULL, .name = "full" },
{ .mask = USB_SPEED_MASK_HIGH, .name = "high" },
{ .mask = USB_SPEED_MASK_SUPER, .name = "super" },
};
int i, pos = 0;
for (i = 0; i < ARRAY_SIZE(speeds); i++) {
if (speeds[i].mask & speedmask) {
pos += snprintf(dest + pos, size - pos, "%s%s",
pos ? "+" : "",
speeds[i].name);
}
}
if (pos == 0) {
snprintf(dest, size, "unknown");
}
}
void usb_check_attach(USBDevice *dev, Error **errp)
{
USBBus *bus = usb_bus_from_device(dev);
USBPort *port = dev->port;
char devspeed[32], portspeed[32];
assert(port != NULL);
assert(!dev->attached);
usb_mask_to_str(devspeed, sizeof(devspeed), dev->speedmask);
usb_mask_to_str(portspeed, sizeof(portspeed), port->speedmask);
trace_usb_port_attach(bus->busnr, port->path,
devspeed, portspeed);
if (!(port->speedmask & dev->speedmask)) {
error_setg(errp, "Warning: speed mismatch trying to attach"
" usb device \"%s\" (%s speed)"
" to bus \"%s\", port \"%s\" (%s speed)",
dev->product_desc, devspeed,
bus->qbus.name, port->path, portspeed);
return;
}
}
void usb_device_attach(USBDevice *dev, Error **errp)
{
USBPort *port = dev->port;
Error *local_err = NULL;
usb_check_attach(dev, &local_err);
if (local_err) {
error_propagate(errp, local_err);
return;
}
dev->attached = true;
usb_attach(port);
}
int usb_device_detach(USBDevice *dev)
{
USBBus *bus = usb_bus_from_device(dev);
USBPort *port = dev->port;
assert(port != NULL);
assert(dev->attached);
trace_usb_port_detach(bus->busnr, port->path);
usb_detach(port);
dev->attached = false;
return 0;
}
static const char *usb_speed(unsigned int speed)
{
static const char *txt[] = {
[ USB_SPEED_LOW ] = "1.5",
[ USB_SPEED_FULL ] = "12",
[ USB_SPEED_HIGH ] = "480",
[ USB_SPEED_SUPER ] = "5000",
};
if (speed >= ARRAY_SIZE(txt))
return "?";
return txt[speed];
}
static void usb_bus_dev_print(Monitor *mon, DeviceState *qdev, int indent)
{
USBDevice *dev = USB_DEVICE(qdev);
USBBus *bus = usb_bus_from_device(dev);
monitor_printf(mon, "%*saddr %d.%d, port %s, speed %s, name %s%s\n",
indent, "", bus->busnr, dev->addr,
dev->port ? dev->port->path : "-",
usb_speed(dev->speed), dev->product_desc,
dev->attached ? ", attached" : "");
}
static char *usb_get_dev_path(DeviceState *qdev)
{
USBDevice *dev = USB_DEVICE(qdev);
DeviceState *hcd = qdev->parent_bus->parent;
char *id = qdev_get_dev_path(hcd);
if (id) {
char *ret = g_strdup_printf("%s/%s", id, dev->port->path);
g_free(id);
return ret;
} else {
return g_strdup(dev->port->path);
}
}
static char *usb_get_fw_dev_path(DeviceState *qdev)
{
USBDevice *dev = USB_DEVICE(qdev);
char *fw_path, *in;
ssize_t pos = 0, fw_len;
long nr;
fw_len = 32 + strlen(dev->port->path) * 6;
fw_path = g_malloc(fw_len);
in = dev->port->path;
while (fw_len - pos > 0) {
nr = strtol(in, &in, 10);
if (in[0] == '.') {
/* some hub between root port and device */
pos += snprintf(fw_path + pos, fw_len - pos, "hub@%lx/", nr);
in++;
} else {
/* the device itself */
snprintf(fw_path + pos, fw_len - pos, "%s@%lx",
qdev_fw_name(qdev), nr);
break;
}
}
return fw_path;
}
HumanReadableText *qmp_x_query_usb(Error **errp)
{
g_autoptr(GString) buf = g_string_new("");
USBBus *bus;
USBDevice *dev;
USBPort *port;
if (QTAILQ_EMPTY(&busses)) {
error_setg(errp, "USB support not enabled");
return NULL;
}
QTAILQ_FOREACH(bus, &busses, next) {
QTAILQ_FOREACH(port, &bus->used, next) {
dev = port->dev;
if (!dev)
continue;
g_string_append_printf(buf,
" Device %d.%d, Port %s, Speed %s Mb/s, "
"Product %s%s%s\n",
bus->busnr, dev->addr, port->path,
usb_speed(dev->speed), dev->product_desc,
dev->qdev.id ? ", ID: " : "",
dev->qdev.id ?: "");
}
}
return human_readable_text_from_str(buf);
}
/* handle legacy -usbdevice cmd line option */
USBDevice *usbdevice_create(const char *driver)
{
USBBus *bus = QTAILQ_FIRST(&busses);
LegacyUSBFactory *f = NULL;
Error *err = NULL;
GSList *i;
USBDevice *dev;
if (strchr(driver, ':')) {
error_report("usbdevice parameters are not supported anymore");
return NULL;
}
for (i = legacy_usb_factory; i; i = i->next) {
f = i->data;
if (strcmp(f->usbdevice_name, driver) == 0) {
break;
}
}
if (i == NULL) {
#if 0
/* no error because some drivers are not converted (yet) */
error_report("usbdevice %s not found", driver);
#endif
return NULL;
}
if (!bus) {
error_report("Error: no usb bus to attach usbdevice %s, "
"please try -machine usb=on and check that "
"the machine model supports USB", driver);
return NULL;
}
dev = f->usbdevice_init ? f->usbdevice_init() : usb_new(f->name);
if (!dev) {
error_report("Failed to create USB device '%s'", f->name);
return NULL;
}
if (!usb_realize_and_unref(dev, bus, &err)) {
error_reportf_err(err, "Failed to initialize USB device '%s': ",
f->name);
object_unparent(OBJECT(dev));
return NULL;
}
return dev;
}
static bool usb_get_attached(Object *obj, Error **errp)
{
USBDevice *dev = USB_DEVICE(obj);
return dev->attached;
}
static void usb_set_attached(Object *obj, bool value, Error **errp)
{
USBDevice *dev = USB_DEVICE(obj);
if (dev->attached == value) {
return;
}
if (value) {
usb_device_attach(dev, errp);
} else {
usb_device_detach(dev);
}
}
static void usb_device_instance_init(Object *obj)
{
USBDevice *dev = USB_DEVICE(obj);
USBDeviceClass *klass = USB_DEVICE_GET_CLASS(dev);
if (klass->attached_settable) {
object_property_add_bool(obj, "attached",
usb_get_attached, usb_set_attached);
} else {
object_property_add_bool(obj, "attached",
usb_get_attached, NULL);
}
}
static void usb_device_class_init(ObjectClass *klass, void *data)
{
DeviceClass *k = DEVICE_CLASS(klass);
k->bus_type = TYPE_USB_BUS;
k->realize = usb_qdev_realize;
k->unrealize = usb_qdev_unrealize;
device_class_set_props(k, usb_props);
}
static const TypeInfo usb_device_type_info = {
.name = TYPE_USB_DEVICE,
.parent = TYPE_DEVICE,
.instance_size = sizeof(USBDevice),
.instance_init = usb_device_instance_init,
.abstract = true,
.class_size = sizeof(USBDeviceClass),
.class_init = usb_device_class_init,
};
static void usb_register_types(void)
{
type_register_static(&usb_bus_info);
type_register_static(&usb_device_type_info);
}
type_init(usb_register_types)
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