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qemu/ui/input-barrier.c
Markus Armbruster d2623129a7 qom: Drop parameter @errp of object_property_add() & friends 
The only way object_property_add() can fail is when a property with
the same name already exists.  Since our property names are all
hardcoded, failure is a programming error, and the appropriate way to
handle it is passing &error_abort.

Same for its variants, except for object_property_add_child(), which
additionally fails when the child already has a parent.  Parentage is
also under program control, so this is a programming error, too.

We have a bit over 500 callers.  Almost half of them pass
&error_abort, slightly fewer ignore errors, one test case handles
errors, and the remaining few callers pass them to their own callers.

The previous few commits demonstrated once again that ignoring
programming errors is a bad idea.

Of the few ones that pass on errors, several violate the Error API.
The Error ** argument must be NULL, &error_abort, &error_fatal, or a
pointer to a variable containing NULL.  Passing an argument of the
latter kind twice without clearing it in between is wrong: if the
first call sets an error, it no longer points to NULL for the second
call.  ich9_pm_add_properties(), sparc32_ledma_realize(),
sparc32_dma_realize(), xilinx_axidma_realize(), xilinx_enet_realize()
are wrong that way.

When the one appropriate choice of argument is &error_abort, letting
users pick the argument is a bad idea.

Drop parameter @errp and assert the preconditions instead.

There's one exception to "duplicate property name is a programming
error": the way object_property_add() implements the magic (and
undocumented) "automatic arrayification".  Don't drop @errp there.
Instead, rename object_property_add() to object_property_try_add(),
and add the obvious wrapper object_property_add().

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Message-Id: <20200505152926.18877-15-armbru@redhat.com>
[Two semantic rebase conflicts resolved]
2020-05-15 07:07:58 +02:00

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/*
* SPDX-License-Identifier: GPL-2.0-or-later
*
* This work is licensed under the terms of the GNU GPL, version 2 or later.
* See the COPYING file in the top-level directory.
*/
#include "qemu/osdep.h"
#include "sysemu/sysemu.h"
#include "qemu/main-loop.h"
#include "qemu/sockets.h"
#include "qapi/error.h"
#include "qom/object_interfaces.h"
#include "io/channel-socket.h"
#include "ui/input.h"
#include "ui/vnc_keysym.h" /* use name2keysym from VNC as we use X11 values */
#include "qemu/cutils.h"
#include "qapi/qmp/qerror.h"
#include "input-barrier.h"
#define TYPE_INPUT_BARRIER "input-barrier"
#define INPUT_BARRIER(obj) \
OBJECT_CHECK(InputBarrier, (obj), TYPE_INPUT_BARRIER)
#define INPUT_BARRIER_GET_CLASS(obj) \
OBJECT_GET_CLASS(InputBarrierClass, (obj), TYPE_INPUT_BARRIER)
#define INPUT_BARRIER_CLASS(klass) \
OBJECT_CLASS_CHECK(InputBarrierClass, (klass), TYPE_INPUT_BARRIER)
typedef struct InputBarrier InputBarrier;
typedef struct InputBarrierClass InputBarrierClass;
#define MAX_HELLO_LENGTH 1024
struct InputBarrier {
Object parent;
QIOChannelSocket *sioc;
guint ioc_tag;
/* display properties */
gchar *name;
int16_t x_origin, y_origin;
int16_t width, height;
/* keyboard/mouse server */
SocketAddress saddr;
char buffer[MAX_HELLO_LENGTH];
};
struct InputBarrierClass {
ObjectClass parent_class;
};
static const char *cmd_names[] = {
[barrierCmdCNoop] = "CNOP",
[barrierCmdCClose] = "CBYE",
[barrierCmdCEnter] = "CINN",
[barrierCmdCLeave] = "COUT",
[barrierCmdCClipboard] = "CCLP",
[barrierCmdCScreenSaver] = "CSEC",
[barrierCmdCResetOptions] = "CROP",
[barrierCmdCInfoAck] = "CIAK",
[barrierCmdCKeepAlive] = "CALV",
[barrierCmdDKeyDown] = "DKDN",
[barrierCmdDKeyRepeat] = "DKRP",
[barrierCmdDKeyUp] = "DKUP",
[barrierCmdDMouseDown] = "DMDN",
[barrierCmdDMouseUp] = "DMUP",
[barrierCmdDMouseMove] = "DMMV",
[barrierCmdDMouseRelMove] = "DMRM",
[barrierCmdDMouseWheel] = "DMWM",
[barrierCmdDClipboard] = "DCLP",
[barrierCmdDInfo] = "DINF",
[barrierCmdDSetOptions] = "DSOP",
[barrierCmdDFileTransfer] = "DFTR",
[barrierCmdDDragInfo] = "DDRG",
[barrierCmdQInfo] = "QINF",
[barrierCmdEIncompatible] = "EICV",
[barrierCmdEBusy] = "EBSY",
[barrierCmdEUnknown] = "EUNK",
[barrierCmdEBad] = "EBAD",
[barrierCmdHello] = "Barrier",
[barrierCmdHelloBack] = "Barrier",
};
static kbd_layout_t *kbd_layout;
static int input_barrier_to_qcode(uint16_t keyid, uint16_t keycode)
{
/* keycode is optional, if it is not provided use keyid */
if (keycode && keycode <= qemu_input_map_xorgkbd_to_qcode_len) {
return qemu_input_map_xorgkbd_to_qcode[keycode];
}
if (keyid >= 0xE000 && keyid <= 0xEFFF) {
keyid += 0x1000;
}
/* keyid is the X11 key id */
if (kbd_layout) {
keycode = keysym2scancode(kbd_layout, keyid, NULL, false);
return qemu_input_key_number_to_qcode(keycode);
}
return qemu_input_map_x11_to_qcode[keyid];
}
static int input_barrier_to_mouse(uint8_t buttonid)
{
switch (buttonid) {
case barrierButtonLeft:
return INPUT_BUTTON_LEFT;
case barrierButtonMiddle:
return INPUT_BUTTON_MIDDLE;
case barrierButtonRight:
return INPUT_BUTTON_RIGHT;
case barrierButtonExtra0:
return INPUT_BUTTON_SIDE;
}
return buttonid;
}
#define read_char(x, p, l) \
do { \
int size = sizeof(char); \
if (l < size) { \
return G_SOURCE_REMOVE; \
} \
x = *(char *)p; \
p += size; \
l -= size; \
} while (0)
#define read_short(x, p, l) \
do { \
int size = sizeof(short); \
if (l < size) { \
return G_SOURCE_REMOVE; \
} \
x = ntohs(*(short *)p); \
p += size; \
l -= size; \
} while (0)
#define write_short(p, x, l) \
do { \
int size = sizeof(short); \
if (l < size) { \
return G_SOURCE_REMOVE; \
} \
*(short *)p = htons(x); \
p += size; \
l -= size; \
} while (0)
#define read_int(x, p, l) \
do { \
int size = sizeof(int); \
if (l < size) { \
return G_SOURCE_REMOVE; \
} \
x = ntohl(*(int *)p); \
p += size; \
l -= size; \
} while (0)
#define write_int(p, x, l) \
do { \
int size = sizeof(int); \
if (l < size) { \
return G_SOURCE_REMOVE; \
} \
*(int *)p = htonl(x); \
p += size; \
l -= size; \
} while (0)
#define write_cmd(p, c, l) \
do { \
int size = strlen(cmd_names[c]); \
if (l < size) { \
return G_SOURCE_REMOVE; \
} \
memcpy(p, cmd_names[c], size); \
p += size; \
l -= size; \
} while (0)
#define write_string(p, s, l) \
do { \
int size = strlen(s); \
if (l < size + sizeof(int)) { \
return G_SOURCE_REMOVE; \
} \
*(int *)p = htonl(size); \
p += sizeof(size); \
l -= sizeof(size); \
memcpy(p, s, size); \
p += size; \
l -= size; \
} while (0)
static gboolean readcmd(InputBarrier *ib, struct barrierMsg *msg)
{
int ret, len, i;
enum barrierCmd cmd;
char *p;
ret = qio_channel_read(QIO_CHANNEL(ib->sioc), (char *)&len, sizeof(len),
NULL);
if (ret < 0) {
return G_SOURCE_REMOVE;
}
len = ntohl(len);
if (len > MAX_HELLO_LENGTH) {
return G_SOURCE_REMOVE;
}
ret = qio_channel_read(QIO_CHANNEL(ib->sioc), ib->buffer, len, NULL);
if (ret < 0) {
return G_SOURCE_REMOVE;
}
p = ib->buffer;
if (len >= strlen(cmd_names[barrierCmdHello]) &&
memcmp(p, cmd_names[barrierCmdHello],
strlen(cmd_names[barrierCmdHello])) == 0) {
cmd = barrierCmdHello;
p += strlen(cmd_names[barrierCmdHello]);
len -= strlen(cmd_names[barrierCmdHello]);
} else {
for (cmd = 0; cmd < barrierCmdHello; cmd++) {
if (memcmp(ib->buffer, cmd_names[cmd], 4) == 0) {
break;
}
}
if (cmd == barrierCmdHello) {
return G_SOURCE_REMOVE;
}
p += 4;
len -= 4;
}
msg->cmd = cmd;
switch (cmd) {
/* connection */
case barrierCmdHello:
read_short(msg->version.major, p, len);
read_short(msg->version.minor, p, len);
break;
case barrierCmdDSetOptions:
read_int(msg->set.nb, p, len);
msg->set.nb /= 2;
if (msg->set.nb > BARRIER_MAX_OPTIONS) {
msg->set.nb = BARRIER_MAX_OPTIONS;
}
i = 0;
while (len && i < msg->set.nb) {
read_int(msg->set.option[i].id, p, len);
/* it's a string, restore endianness */
msg->set.option[i].id = htonl(msg->set.option[i].id);
msg->set.option[i].nul = 0;
read_int(msg->set.option[i].value, p, len);
i++;
}
break;
case barrierCmdQInfo:
break;
/* mouse */
case barrierCmdDMouseMove:
case barrierCmdDMouseRelMove:
read_short(msg->mousepos.x, p, len);
read_short(msg->mousepos.y, p, len);
break;
case barrierCmdDMouseDown:
case barrierCmdDMouseUp:
read_char(msg->mousebutton.buttonid, p, len);
break;
case barrierCmdDMouseWheel:
read_short(msg->mousepos.y, p, len);
msg->mousepos.x = 0;
if (len) {
msg->mousepos.x = msg->mousepos.y;
read_short(msg->mousepos.y, p, len);
}
break;
/* keyboard */
case barrierCmdDKeyDown:
case barrierCmdDKeyUp:
read_short(msg->key.keyid, p, len);
read_short(msg->key.modifier, p, len);
msg->key.button = 0;
if (len) {
read_short(msg->key.button, p, len);
}
break;
case barrierCmdDKeyRepeat:
read_short(msg->repeat.keyid, p, len);
read_short(msg->repeat.modifier, p, len);
read_short(msg->repeat.repeat, p, len);
msg->repeat.button = 0;
if (len) {
read_short(msg->repeat.button, p, len);
}
break;
case barrierCmdCInfoAck:
case barrierCmdCResetOptions:
case barrierCmdCEnter:
case barrierCmdDClipboard:
case barrierCmdCKeepAlive:
case barrierCmdCLeave:
case barrierCmdCClose:
break;
/* Invalid from the server */
case barrierCmdHelloBack:
case barrierCmdCNoop:
case barrierCmdDInfo:
break;
/* Error codes */
case barrierCmdEIncompatible:
read_short(msg->version.major, p, len);
read_short(msg->version.minor, p, len);
break;
case barrierCmdEBusy:
case barrierCmdEUnknown:
case barrierCmdEBad:
break;
default:
return G_SOURCE_REMOVE;
}
return G_SOURCE_CONTINUE;
}
static gboolean writecmd(InputBarrier *ib, struct barrierMsg *msg)
{
char *p;
int ret, i;
int avail, len;
p = ib->buffer;
avail = MAX_HELLO_LENGTH;
/* reserve space to store the length */
p += sizeof(int);
avail -= sizeof(int);
switch (msg->cmd) {
case barrierCmdHello:
if (msg->version.major < BARRIER_VERSION_MAJOR ||
(msg->version.major == BARRIER_VERSION_MAJOR &&
msg->version.minor < BARRIER_VERSION_MINOR)) {
ib->ioc_tag = 0;
return G_SOURCE_REMOVE;
}
write_cmd(p, barrierCmdHelloBack, avail);
write_short(p, BARRIER_VERSION_MAJOR, avail);
write_short(p, BARRIER_VERSION_MINOR, avail);
write_string(p, ib->name, avail);
break;
case barrierCmdCClose:
ib->ioc_tag = 0;
return G_SOURCE_REMOVE;
case barrierCmdQInfo:
write_cmd(p, barrierCmdDInfo, avail);
write_short(p, ib->x_origin, avail);
write_short(p, ib->y_origin, avail);
write_short(p, ib->width, avail);
write_short(p, ib->height, avail);
write_short(p, 0, avail); /* warpsize (obsolete) */
write_short(p, 0, avail); /* mouse x */
write_short(p, 0, avail); /* mouse y */
break;
case barrierCmdCInfoAck:
break;
case barrierCmdCResetOptions:
/* TODO: reset options */
break;
case barrierCmdDSetOptions:
/* TODO: set options */
break;
case barrierCmdCEnter:
break;
case barrierCmdDClipboard:
break;
case barrierCmdCKeepAlive:
write_cmd(p, barrierCmdCKeepAlive, avail);
break;
case barrierCmdCLeave:
break;
/* mouse */
case barrierCmdDMouseMove:
qemu_input_queue_abs(NULL, INPUT_AXIS_X, msg->mousepos.x,
ib->x_origin, ib->width);
qemu_input_queue_abs(NULL, INPUT_AXIS_Y, msg->mousepos.y,
ib->y_origin, ib->height);
qemu_input_event_sync();
break;
case barrierCmdDMouseRelMove:
qemu_input_queue_rel(NULL, INPUT_AXIS_X, msg->mousepos.x);
qemu_input_queue_rel(NULL, INPUT_AXIS_Y, msg->mousepos.y);
qemu_input_event_sync();
break;
case barrierCmdDMouseDown:
qemu_input_queue_btn(NULL,
input_barrier_to_mouse(msg->mousebutton.buttonid),
true);
qemu_input_event_sync();
break;
case barrierCmdDMouseUp:
qemu_input_queue_btn(NULL,
input_barrier_to_mouse(msg->mousebutton.buttonid),
false);
qemu_input_event_sync();
break;
case barrierCmdDMouseWheel:
qemu_input_queue_btn(NULL, (msg->mousepos.y > 0) ? INPUT_BUTTON_WHEEL_UP
: INPUT_BUTTON_WHEEL_DOWN, true);
qemu_input_event_sync();
qemu_input_queue_btn(NULL, (msg->mousepos.y > 0) ? INPUT_BUTTON_WHEEL_UP
: INPUT_BUTTON_WHEEL_DOWN, false);
qemu_input_event_sync();
break;
/* keyboard */
case barrierCmdDKeyDown:
qemu_input_event_send_key_qcode(NULL,
input_barrier_to_qcode(msg->key.keyid, msg->key.button),
true);
break;
case barrierCmdDKeyRepeat:
for (i = 0; i < msg->repeat.repeat; i++) {
qemu_input_event_send_key_qcode(NULL,
input_barrier_to_qcode(msg->repeat.keyid, msg->repeat.button),
false);
qemu_input_event_send_key_qcode(NULL,
input_barrier_to_qcode(msg->repeat.keyid, msg->repeat.button),
true);
}
break;
case barrierCmdDKeyUp:
qemu_input_event_send_key_qcode(NULL,
input_barrier_to_qcode(msg->key.keyid, msg->key.button),
false);
break;
default:
write_cmd(p, barrierCmdEUnknown, avail);
break;
}
len = MAX_HELLO_LENGTH - avail - sizeof(int);
if (len) {
p = ib->buffer;
avail = sizeof(len);
write_int(p, len, avail);
ret = qio_channel_write(QIO_CHANNEL(ib->sioc), ib->buffer,
len + sizeof(len), NULL);
if (ret < 0) {
ib->ioc_tag = 0;
return G_SOURCE_REMOVE;
}
}
return G_SOURCE_CONTINUE;
}
static gboolean input_barrier_event(QIOChannel *ioc G_GNUC_UNUSED,
GIOCondition condition, void *opaque)
{
InputBarrier *ib = opaque;
int ret;
struct barrierMsg msg;
ret = readcmd(ib, &msg);
if (ret == G_SOURCE_REMOVE) {
ib->ioc_tag = 0;
return G_SOURCE_REMOVE;
}
return writecmd(ib, &msg);
}
static void input_barrier_complete(UserCreatable *uc, Error **errp)
{
InputBarrier *ib = INPUT_BARRIER(uc);
Error *local_err = NULL;
if (!ib->name) {
error_setg(errp, QERR_MISSING_PARAMETER, "name");
return;
}
/*
* Connect to the primary
* Primary is the server where the keyboard and the mouse
* are connected and forwarded to the secondary (the client)
*/
ib->sioc = qio_channel_socket_new();
qio_channel_set_name(QIO_CHANNEL(ib->sioc), "barrier-client");
qio_channel_socket_connect_sync(ib->sioc, &ib->saddr, &local_err);
if (local_err) {
error_propagate(errp, local_err);
return;
}
qio_channel_set_delay(QIO_CHANNEL(ib->sioc), false);
ib->ioc_tag = qio_channel_add_watch(QIO_CHANNEL(ib->sioc), G_IO_IN,
input_barrier_event, ib, NULL);
}
static void input_barrier_instance_finalize(Object *obj)
{
InputBarrier *ib = INPUT_BARRIER(obj);
if (ib->ioc_tag) {
g_source_remove(ib->ioc_tag);
ib->ioc_tag = 0;
}
if (ib->sioc) {
qio_channel_close(QIO_CHANNEL(ib->sioc), NULL);
object_unref(OBJECT(ib->sioc));
}
g_free(ib->name);
g_free(ib->saddr.u.inet.host);
g_free(ib->saddr.u.inet.port);
}
static char *input_barrier_get_name(Object *obj, Error **errp)
{
InputBarrier *ib = INPUT_BARRIER(obj);
return g_strdup(ib->name);
}
static void input_barrier_set_name(Object *obj, const char *value,
Error **errp)
{
InputBarrier *ib = INPUT_BARRIER(obj);
if (ib->name) {
error_setg(errp, "name property already set");
return;
}
ib->name = g_strdup(value);
}
static char *input_barrier_get_server(Object *obj, Error **errp)
{
InputBarrier *ib = INPUT_BARRIER(obj);
return g_strdup(ib->saddr.u.inet.host);
}
static void input_barrier_set_server(Object *obj, const char *value,
Error **errp)
{
InputBarrier *ib = INPUT_BARRIER(obj);
g_free(ib->saddr.u.inet.host);
ib->saddr.u.inet.host = g_strdup(value);
}
static char *input_barrier_get_port(Object *obj, Error **errp)
{
InputBarrier *ib = INPUT_BARRIER(obj);
return g_strdup(ib->saddr.u.inet.port);
}
static void input_barrier_set_port(Object *obj, const char *value,
Error **errp)
{
InputBarrier *ib = INPUT_BARRIER(obj);
g_free(ib->saddr.u.inet.port);
ib->saddr.u.inet.port = g_strdup(value);
}
static void input_barrier_set_x_origin(Object *obj, const char *value,
Error **errp)
{
InputBarrier *ib = INPUT_BARRIER(obj);
int result, err;
err = qemu_strtoi(value, NULL, 0, &result);
if (err < 0 || result < 0 || result > SHRT_MAX) {
error_setg(errp,
"x-origin property must be in the range [0..%d]", SHRT_MAX);
return;
}
ib->x_origin = result;
}
static char *input_barrier_get_x_origin(Object *obj, Error **errp)
{
InputBarrier *ib = INPUT_BARRIER(obj);
return g_strdup_printf("%d", ib->x_origin);
}
static void input_barrier_set_y_origin(Object *obj, const char *value,
Error **errp)
{
InputBarrier *ib = INPUT_BARRIER(obj);
int result, err;
err = qemu_strtoi(value, NULL, 0, &result);
if (err < 0 || result < 0 || result > SHRT_MAX) {
error_setg(errp,
"y-origin property must be in the range [0..%d]", SHRT_MAX);
return;
}
ib->y_origin = result;
}
static char *input_barrier_get_y_origin(Object *obj, Error **errp)
{
InputBarrier *ib = INPUT_BARRIER(obj);
return g_strdup_printf("%d", ib->y_origin);
}
static void input_barrier_set_width(Object *obj, const char *value,
Error **errp)
{
InputBarrier *ib = INPUT_BARRIER(obj);
int result, err;
err = qemu_strtoi(value, NULL, 0, &result);
if (err < 0 || result < 0 || result > SHRT_MAX) {
error_setg(errp,
"width property must be in the range [0..%d]", SHRT_MAX);
return;
}
ib->width = result;
}
static char *input_barrier_get_width(Object *obj, Error **errp)
{
InputBarrier *ib = INPUT_BARRIER(obj);
return g_strdup_printf("%d", ib->width);
}
static void input_barrier_set_height(Object *obj, const char *value,
Error **errp)
{
InputBarrier *ib = INPUT_BARRIER(obj);
int result, err;
err = qemu_strtoi(value, NULL, 0, &result);
if (err < 0 || result < 0 || result > SHRT_MAX) {
error_setg(errp,
"height property must be in the range [0..%d]", SHRT_MAX);
return;
}
ib->height = result;
}
static char *input_barrier_get_height(Object *obj, Error **errp)
{
InputBarrier *ib = INPUT_BARRIER(obj);
return g_strdup_printf("%d", ib->height);
}
static void input_barrier_instance_init(Object *obj)
{
InputBarrier *ib = INPUT_BARRIER(obj);
/* always use generic keymaps */
if (keyboard_layout && !kbd_layout) {
/* We use X11 key id, so use VNC name2keysym */
kbd_layout = init_keyboard_layout(name2keysym, keyboard_layout,
&error_fatal);
}
ib->saddr.type = SOCKET_ADDRESS_TYPE_INET;
ib->saddr.u.inet.host = g_strdup("localhost");
ib->saddr.u.inet.port = g_strdup("24800");
ib->x_origin = 0;
ib->y_origin = 0;
ib->width = 1920;
ib->height = 1080;
object_property_add_str(obj, "name",
input_barrier_get_name,
input_barrier_set_name);
object_property_add_str(obj, "server",
input_barrier_get_server,
input_barrier_set_server);
object_property_add_str(obj, "port",
input_barrier_get_port,
input_barrier_set_port);
object_property_add_str(obj, "x-origin",
input_barrier_get_x_origin,
input_barrier_set_x_origin);
object_property_add_str(obj, "y-origin",
input_barrier_get_y_origin,
input_barrier_set_y_origin);
object_property_add_str(obj, "width",
input_barrier_get_width,
input_barrier_set_width);
object_property_add_str(obj, "height",
input_barrier_get_height,
input_barrier_set_height);
}
static void input_barrier_class_init(ObjectClass *oc, void *data)
{
UserCreatableClass *ucc = USER_CREATABLE_CLASS(oc);
ucc->complete = input_barrier_complete;
}
static const TypeInfo input_barrier_info = {
.name = TYPE_INPUT_BARRIER,
.parent = TYPE_OBJECT,
.class_size = sizeof(InputBarrierClass),
.class_init = input_barrier_class_init,
.instance_size = sizeof(InputBarrier),
.instance_init = input_barrier_instance_init,
.instance_finalize = input_barrier_instance_finalize,
.interfaces = (InterfaceInfo[]) {
{ TYPE_USER_CREATABLE },
{ }
}
};
static void register_types(void)
{
type_register_static(&input_barrier_info);
}
type_init(register_types);
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