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qemu/ui/vnc.c
Marc-André Lureau 0e60fc8093 vnc: fix crash when no console attached 
Since commit e99441a379 ("ui/curses: Do not use console_select()")
qemu_text_console_put_keysym() no longer checks for NULL console
argument, which leads to a later crash:

Thread 1 "qemu-system-x86" received signal SIGSEGV, Segmentation fault.
0x00005555559ee186 in qemu_text_console_handle_keysym (s=0x0, keysym=31) at ../ui/console-vc.c:332
332	        } else if (s->echo && (keysym == '\r' || keysym == '\n')) {
(gdb) bt
 #0  0x00005555559ee186 in qemu_text_console_handle_keysym (s=0x0, keysym=31) at ../ui/console-vc.c:332
 #1  0x00005555559e18e5 in qemu_text_console_put_keysym (s=<optimized out>, keysym=<optimized out>) at ../ui/console.c:303
 #2  0x00005555559f2e88 in do_key_event (vs=vs@entry=0x5555579045c0, down=down@entry=1, keycode=keycode@entry=60, sym=sym@entry=65471) at ../ui/vnc.c:2034
 #3  0x00005555559f845c in ext_key_event (vs=0x5555579045c0, down=1, sym=65471, keycode=<optimized out>) at ../ui/vnc.c:2070
 #4  protocol_client_msg (vs=0x5555579045c0, data=<optimized out>, len=<optimized out>) at ../ui/vnc.c:2514
 #5  0x00005555559f515c in vnc_client_read (vs=0x5555579045c0) at ../ui/vnc.c:1607

Fixes: e99441a379 ("ui/curses: Do not use console_select()")
Fixes: https://issues.redhat.com/browse/RHEL-50529
Cc: qemu-stable@nongnu.org
Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: Akihiko Odaki <akihiko.odaki@daynix.com>
Reviewed-by: Michael Tokarev <mjt@tls.msk.ru>
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
2024-10-03 17:26:05 +03:00

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/*
* QEMU VNC display driver
*
* Copyright (C) 2006 Anthony Liguori <anthony@codemonkey.ws>
* Copyright (C) 2006 Fabrice Bellard
* Copyright (C) 2009 Red Hat, Inc
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include "qemu/osdep.h"
#include "vnc.h"
#include "vnc-jobs.h"
#include "trace.h"
#include "hw/qdev-core.h"
#include "sysemu/sysemu.h"
#include "sysemu/runstate.h"
#include "qemu/error-report.h"
#include "qemu/main-loop.h"
#include "qemu/module.h"
#include "qemu/option.h"
#include "qemu/sockets.h"
#include "qemu/timer.h"
#include "authz/list.h"
#include "qemu/config-file.h"
#include "qapi/qapi-emit-events.h"
#include "qapi/qapi-events-ui.h"
#include "qapi/error.h"
#include "qapi/qapi-commands-ui.h"
#include "ui/input.h"
#include "crypto/hash.h"
#include "crypto/tlscreds.h"
#include "crypto/tlscredsanon.h"
#include "crypto/tlscredsx509.h"
#include "crypto/random.h"
#include "crypto/secret_common.h"
#include "qom/object_interfaces.h"
#include "qemu/cutils.h"
#include "qemu/help_option.h"
#include "io/dns-resolver.h"
#include "monitor/monitor.h"
#define VNC_REFRESH_INTERVAL_BASE GUI_REFRESH_INTERVAL_DEFAULT
#define VNC_REFRESH_INTERVAL_INC 50
#define VNC_REFRESH_INTERVAL_MAX GUI_REFRESH_INTERVAL_IDLE
static const struct timeval VNC_REFRESH_STATS = { 0, 500000 };
static const struct timeval VNC_REFRESH_LOSSY = { 2, 0 };
#include "vnc_keysym.h"
#include "crypto/cipher.h"
static QTAILQ_HEAD(, VncDisplay) vnc_displays =
QTAILQ_HEAD_INITIALIZER(vnc_displays);
static int vnc_cursor_define(VncState *vs);
static void vnc_update_throttle_offset(VncState *vs);
static void vnc_set_share_mode(VncState *vs, VncShareMode mode)
{
#ifdef _VNC_DEBUG
static const char *mn[] = {
[0] = "undefined",
[VNC_SHARE_MODE_CONNECTING] = "connecting",
[VNC_SHARE_MODE_SHARED] = "shared",
[VNC_SHARE_MODE_EXCLUSIVE] = "exclusive",
[VNC_SHARE_MODE_DISCONNECTED] = "disconnected",
};
fprintf(stderr, "%s/%p: %s -> %s\n", __func__,
vs->ioc, mn[vs->share_mode], mn[mode]);
#endif
switch (vs->share_mode) {
case VNC_SHARE_MODE_CONNECTING:
vs->vd->num_connecting--;
break;
case VNC_SHARE_MODE_SHARED:
vs->vd->num_shared--;
break;
case VNC_SHARE_MODE_EXCLUSIVE:
vs->vd->num_exclusive--;
break;
default:
break;
}
vs->share_mode = mode;
switch (vs->share_mode) {
case VNC_SHARE_MODE_CONNECTING:
vs->vd->num_connecting++;
break;
case VNC_SHARE_MODE_SHARED:
vs->vd->num_shared++;
break;
case VNC_SHARE_MODE_EXCLUSIVE:
vs->vd->num_exclusive++;
break;
default:
break;
}
}
static void vnc_init_basic_info(SocketAddress *addr,
VncBasicInfo *info,
Error **errp)
{
switch (addr->type) {
case SOCKET_ADDRESS_TYPE_INET:
info->host = g_strdup(addr->u.inet.host);
info->service = g_strdup(addr->u.inet.port);
if (addr->u.inet.ipv6) {
info->family = NETWORK_ADDRESS_FAMILY_IPV6;
} else {
info->family = NETWORK_ADDRESS_FAMILY_IPV4;
}
break;
case SOCKET_ADDRESS_TYPE_UNIX:
info->host = g_strdup("");
info->service = g_strdup(addr->u.q_unix.path);
info->family = NETWORK_ADDRESS_FAMILY_UNIX;
break;
case SOCKET_ADDRESS_TYPE_VSOCK:
case SOCKET_ADDRESS_TYPE_FD:
error_setg(errp, "Unsupported socket address type %s",
SocketAddressType_str(addr->type));
break;
default:
abort();
}
return;
}
static void vnc_init_basic_info_from_server_addr(QIOChannelSocket *ioc,
VncBasicInfo *info,
Error **errp)
{
SocketAddress *addr = NULL;
if (!ioc) {
error_setg(errp, "No listener socket available");
return;
}
addr = qio_channel_socket_get_local_address(ioc, errp);
if (!addr) {
return;
}
vnc_init_basic_info(addr, info, errp);
qapi_free_SocketAddress(addr);
}
static void vnc_init_basic_info_from_remote_addr(QIOChannelSocket *ioc,
VncBasicInfo *info,
Error **errp)
{
SocketAddress *addr = NULL;
addr = qio_channel_socket_get_remote_address(ioc, errp);
if (!addr) {
return;
}
vnc_init_basic_info(addr, info, errp);
qapi_free_SocketAddress(addr);
}
static const char *vnc_auth_name(VncDisplay *vd) {
switch (vd->auth) {
case VNC_AUTH_INVALID:
return "invalid";
case VNC_AUTH_NONE:
return "none";
case VNC_AUTH_VNC:
return "vnc";
case VNC_AUTH_RA2:
return "ra2";
case VNC_AUTH_RA2NE:
return "ra2ne";
case VNC_AUTH_TIGHT:
return "tight";
case VNC_AUTH_ULTRA:
return "ultra";
case VNC_AUTH_TLS:
return "tls";
case VNC_AUTH_VENCRYPT:
switch (vd->subauth) {
case VNC_AUTH_VENCRYPT_PLAIN:
return "vencrypt+plain";
case VNC_AUTH_VENCRYPT_TLSNONE:
return "vencrypt+tls+none";
case VNC_AUTH_VENCRYPT_TLSVNC:
return "vencrypt+tls+vnc";
case VNC_AUTH_VENCRYPT_TLSPLAIN:
return "vencrypt+tls+plain";
case VNC_AUTH_VENCRYPT_X509NONE:
return "vencrypt+x509+none";
case VNC_AUTH_VENCRYPT_X509VNC:
return "vencrypt+x509+vnc";
case VNC_AUTH_VENCRYPT_X509PLAIN:
return "vencrypt+x509+plain";
case VNC_AUTH_VENCRYPT_TLSSASL:
return "vencrypt+tls+sasl";
case VNC_AUTH_VENCRYPT_X509SASL:
return "vencrypt+x509+sasl";
default:
return "vencrypt";
}
case VNC_AUTH_SASL:
return "sasl";
}
return "unknown";
}
static VncServerInfo *vnc_server_info_get(VncDisplay *vd)
{
VncServerInfo *info;
Error *err = NULL;
if (!vd->listener || !vd->listener->nsioc) {
return NULL;
}
info = g_malloc0(sizeof(*info));
vnc_init_basic_info_from_server_addr(vd->listener->sioc[0],
qapi_VncServerInfo_base(info), &err);
info->auth = g_strdup(vnc_auth_name(vd));
if (err) {
qapi_free_VncServerInfo(info);
info = NULL;
error_free(err);
}
return info;
}
static void vnc_client_cache_auth(VncState *client)
{
if (!client->info) {
return;
}
if (client->tls) {
client->info->x509_dname =
qcrypto_tls_session_get_peer_name(client->tls);
}
#ifdef CONFIG_VNC_SASL
if (client->sasl.conn &&
client->sasl.username) {
client->info->sasl_username = g_strdup(client->sasl.username);
}
#endif
}
static void vnc_client_cache_addr(VncState *client)
{
Error *err = NULL;
client->info = g_malloc0(sizeof(*client->info));
vnc_init_basic_info_from_remote_addr(client->sioc,
qapi_VncClientInfo_base(client->info),
&err);
client->info->websocket = client->websocket;
if (err) {
qapi_free_VncClientInfo(client->info);
client->info = NULL;
error_free(err);
}
}
static void vnc_qmp_event(VncState *vs, QAPIEvent event)
{
VncServerInfo *si;
if (!vs->info) {
return;
}
si = vnc_server_info_get(vs->vd);
if (!si) {
return;
}
switch (event) {
case QAPI_EVENT_VNC_CONNECTED:
qapi_event_send_vnc_connected(si, qapi_VncClientInfo_base(vs->info));
break;
case QAPI_EVENT_VNC_INITIALIZED:
qapi_event_send_vnc_initialized(si, vs->info);
break;
case QAPI_EVENT_VNC_DISCONNECTED:
qapi_event_send_vnc_disconnected(si, vs->info);
break;
default:
break;
}
qapi_free_VncServerInfo(si);
}
static VncClientInfo *qmp_query_vnc_client(const VncState *client)
{
VncClientInfo *info;
Error *err = NULL;
info = g_malloc0(sizeof(*info));
vnc_init_basic_info_from_remote_addr(client->sioc,
qapi_VncClientInfo_base(info),
&err);
if (err) {
error_free(err);
qapi_free_VncClientInfo(info);
return NULL;
}
info->websocket = client->websocket;
if (client->tls) {
info->x509_dname = qcrypto_tls_session_get_peer_name(client->tls);
}
#ifdef CONFIG_VNC_SASL
if (client->sasl.conn && client->sasl.username) {
info->sasl_username = g_strdup(client->sasl.username);
}
#endif
return info;
}
static VncDisplay *vnc_display_find(const char *id)
{
VncDisplay *vd;
if (id == NULL) {
return QTAILQ_FIRST(&vnc_displays);
}
QTAILQ_FOREACH(vd, &vnc_displays, next) {
if (strcmp(id, vd->id) == 0) {
return vd;
}
}
return NULL;
}
static VncClientInfoList *qmp_query_client_list(VncDisplay *vd)
{
VncClientInfoList *prev = NULL;
VncState *client;
QTAILQ_FOREACH(client, &vd->clients, next) {
QAPI_LIST_PREPEND(prev, qmp_query_vnc_client(client));
}
return prev;
}
VncInfo *qmp_query_vnc(Error **errp)
{
VncInfo *info = g_malloc0(sizeof(*info));
VncDisplay *vd = vnc_display_find(NULL);
SocketAddress *addr = NULL;
if (vd == NULL || !vd->listener || !vd->listener->nsioc) {
info->enabled = false;
} else {
info->enabled = true;
/* for compatibility with the original command */
info->has_clients = true;
info->clients = qmp_query_client_list(vd);
addr = qio_channel_socket_get_local_address(vd->listener->sioc[0],
errp);
if (!addr) {
goto out_error;
}
switch (addr->type) {
case SOCKET_ADDRESS_TYPE_INET:
info->host = g_strdup(addr->u.inet.host);
info->service = g_strdup(addr->u.inet.port);
if (addr->u.inet.ipv6) {
info->family = NETWORK_ADDRESS_FAMILY_IPV6;
} else {
info->family = NETWORK_ADDRESS_FAMILY_IPV4;
}
break;
case SOCKET_ADDRESS_TYPE_UNIX:
info->host = g_strdup("");
info->service = g_strdup(addr->u.q_unix.path);
info->family = NETWORK_ADDRESS_FAMILY_UNIX;
break;
case SOCKET_ADDRESS_TYPE_VSOCK:
case SOCKET_ADDRESS_TYPE_FD:
error_setg(errp, "Unsupported socket address type %s",
SocketAddressType_str(addr->type));
goto out_error;
default:
abort();
}
info->has_family = true;
info->auth = g_strdup(vnc_auth_name(vd));
}
qapi_free_SocketAddress(addr);
return info;
out_error:
qapi_free_SocketAddress(addr);
qapi_free_VncInfo(info);
return NULL;
}
static void qmp_query_auth(int auth, int subauth,
VncPrimaryAuth *qmp_auth,
VncVencryptSubAuth *qmp_vencrypt,
bool *qmp_has_vencrypt);
static VncServerInfo2List *qmp_query_server_entry(QIOChannelSocket *ioc,
bool websocket,
int auth,
int subauth,
VncServerInfo2List *prev)
{
VncServerInfo2 *info;
Error *err = NULL;
SocketAddress *addr;
addr = qio_channel_socket_get_local_address(ioc, NULL);
if (!addr) {
return prev;
}
info = g_new0(VncServerInfo2, 1);
vnc_init_basic_info(addr, qapi_VncServerInfo2_base(info), &err);
qapi_free_SocketAddress(addr);
if (err) {
qapi_free_VncServerInfo2(info);
error_free(err);
return prev;
}
info->websocket = websocket;
qmp_query_auth(auth, subauth, &info->auth,
&info->vencrypt, &info->has_vencrypt);
QAPI_LIST_PREPEND(prev, info);
return prev;
}
static void qmp_query_auth(int auth, int subauth,
VncPrimaryAuth *qmp_auth,
VncVencryptSubAuth *qmp_vencrypt,
bool *qmp_has_vencrypt)
{
switch (auth) {
case VNC_AUTH_VNC:
*qmp_auth = VNC_PRIMARY_AUTH_VNC;
break;
case VNC_AUTH_RA2:
*qmp_auth = VNC_PRIMARY_AUTH_RA2;
break;
case VNC_AUTH_RA2NE:
*qmp_auth = VNC_PRIMARY_AUTH_RA2NE;
break;
case VNC_AUTH_TIGHT:
*qmp_auth = VNC_PRIMARY_AUTH_TIGHT;
break;
case VNC_AUTH_ULTRA:
*qmp_auth = VNC_PRIMARY_AUTH_ULTRA;
break;
case VNC_AUTH_TLS:
*qmp_auth = VNC_PRIMARY_AUTH_TLS;
break;
case VNC_AUTH_VENCRYPT:
*qmp_auth = VNC_PRIMARY_AUTH_VENCRYPT;
*qmp_has_vencrypt = true;
switch (subauth) {
case VNC_AUTH_VENCRYPT_PLAIN:
*qmp_vencrypt = VNC_VENCRYPT_SUB_AUTH_PLAIN;
break;
case VNC_AUTH_VENCRYPT_TLSNONE:
*qmp_vencrypt = VNC_VENCRYPT_SUB_AUTH_TLS_NONE;
break;
case VNC_AUTH_VENCRYPT_TLSVNC:
*qmp_vencrypt = VNC_VENCRYPT_SUB_AUTH_TLS_VNC;
break;
case VNC_AUTH_VENCRYPT_TLSPLAIN:
*qmp_vencrypt = VNC_VENCRYPT_SUB_AUTH_TLS_PLAIN;
break;
case VNC_AUTH_VENCRYPT_X509NONE:
*qmp_vencrypt = VNC_VENCRYPT_SUB_AUTH_X509_NONE;
break;
case VNC_AUTH_VENCRYPT_X509VNC:
*qmp_vencrypt = VNC_VENCRYPT_SUB_AUTH_X509_VNC;
break;
case VNC_AUTH_VENCRYPT_X509PLAIN:
*qmp_vencrypt = VNC_VENCRYPT_SUB_AUTH_X509_PLAIN;
break;
case VNC_AUTH_VENCRYPT_TLSSASL:
*qmp_vencrypt = VNC_VENCRYPT_SUB_AUTH_TLS_SASL;
break;
case VNC_AUTH_VENCRYPT_X509SASL:
*qmp_vencrypt = VNC_VENCRYPT_SUB_AUTH_X509_SASL;
break;
default:
*qmp_has_vencrypt = false;
break;
}
break;
case VNC_AUTH_SASL:
*qmp_auth = VNC_PRIMARY_AUTH_SASL;
break;
case VNC_AUTH_NONE:
default:
*qmp_auth = VNC_PRIMARY_AUTH_NONE;
break;
}
}
VncInfo2List *qmp_query_vnc_servers(Error **errp)
{
VncInfo2List *prev = NULL;
VncInfo2 *info;
VncDisplay *vd;
DeviceState *dev;
size_t i;
QTAILQ_FOREACH(vd, &vnc_displays, next) {
info = g_new0(VncInfo2, 1);
info->id = g_strdup(vd->id);
info->clients = qmp_query_client_list(vd);
qmp_query_auth(vd->auth, vd->subauth, &info->auth,
&info->vencrypt, &info->has_vencrypt);
if (vd->dcl.con) {
dev = DEVICE(object_property_get_link(OBJECT(vd->dcl.con),
"device", &error_abort));
info->display = g_strdup(dev->id);
}
for (i = 0; vd->listener != NULL && i < vd->listener->nsioc; i++) {
info->server = qmp_query_server_entry(
vd->listener->sioc[i], false, vd->auth, vd->subauth,
info->server);
}
for (i = 0; vd->wslistener != NULL && i < vd->wslistener->nsioc; i++) {
info->server = qmp_query_server_entry(
vd->wslistener->sioc[i], true, vd->ws_auth,
vd->ws_subauth, info->server);
}
QAPI_LIST_PREPEND(prev, info);
}
return prev;
}
bool vnc_display_reload_certs(const char *id, Error **errp)
{
VncDisplay *vd = vnc_display_find(id);
QCryptoTLSCredsClass *creds = NULL;
if (!vd) {
error_setg(errp, "Can not find vnc display");
return false;
}
if (!vd->tlscreds) {
error_setg(errp, "vnc tls is not enabled");
return false;
}
creds = QCRYPTO_TLS_CREDS_GET_CLASS(OBJECT(vd->tlscreds));
if (creds->reload == NULL) {
error_setg(errp, "%s doesn't support to reload TLS credential",
object_get_typename(OBJECT(vd->tlscreds)));
return false;
}
if (!creds->reload(vd->tlscreds, errp)) {
return false;
}
return true;
}
/* TODO
1) Get the queue working for IO.
2) there is some weirdness when using the -S option (the screen is grey
and not totally invalidated
3) resolutions > 1024
*/
static int vnc_update_client(VncState *vs, int has_dirty);
static void vnc_disconnect_start(VncState *vs);
static void vnc_colordepth(VncState *vs);
static void framebuffer_update_request(VncState *vs, int incremental,
int x_position, int y_position,
int w, int h);
static void vnc_refresh(DisplayChangeListener *dcl);
static int vnc_refresh_server_surface(VncDisplay *vd);
static int vnc_width(VncDisplay *vd)
{
return MIN(VNC_MAX_WIDTH, ROUND_UP(surface_width(vd->ds),
VNC_DIRTY_PIXELS_PER_BIT));
}
static int vnc_true_width(VncDisplay *vd)
{
return MIN(VNC_MAX_WIDTH, surface_width(vd->ds));
}
static int vnc_height(VncDisplay *vd)
{
return MIN(VNC_MAX_HEIGHT, surface_height(vd->ds));
}
static void vnc_set_area_dirty(DECLARE_BITMAP(dirty[VNC_MAX_HEIGHT],
VNC_MAX_WIDTH / VNC_DIRTY_PIXELS_PER_BIT),
VncDisplay *vd,
int x, int y, int w, int h)
{
int width = vnc_width(vd);
int height = vnc_height(vd);
/* this is needed this to ensure we updated all affected
* blocks if x % VNC_DIRTY_PIXELS_PER_BIT != 0 */
w += (x % VNC_DIRTY_PIXELS_PER_BIT);
x -= (x % VNC_DIRTY_PIXELS_PER_BIT);
x = MIN(x, width);
y = MIN(y, height);
w = MIN(x + w, width) - x;
h = MIN(y + h, height);
for (; y < h; y++) {
bitmap_set(dirty[y], x / VNC_DIRTY_PIXELS_PER_BIT,
DIV_ROUND_UP(w, VNC_DIRTY_PIXELS_PER_BIT));
}
}
static void vnc_dpy_update(DisplayChangeListener *dcl,
int x, int y, int w, int h)
{
VncDisplay *vd = container_of(dcl, VncDisplay, dcl);
struct VncSurface *s = &vd->guest;
vnc_set_area_dirty(s->dirty, vd, x, y, w, h);
}
void vnc_framebuffer_update(VncState *vs, int x, int y, int w, int h,
int32_t encoding)
{
vnc_write_u16(vs, x);
vnc_write_u16(vs, y);
vnc_write_u16(vs, w);
vnc_write_u16(vs, h);
vnc_write_s32(vs, encoding);
}
static void vnc_desktop_resize_ext(VncState *vs, int reject_reason)
{
trace_vnc_msg_server_ext_desktop_resize(
vs, vs->ioc, vs->client_width, vs->client_height, reject_reason);
vnc_lock_output(vs);
vnc_write_u8(vs, VNC_MSG_SERVER_FRAMEBUFFER_UPDATE);
vnc_write_u8(vs, 0);
vnc_write_u16(vs, 1); /* number of rects */
vnc_framebuffer_update(vs,
reject_reason ? 1 : 0,
reject_reason,
vs->client_width, vs->client_height,
VNC_ENCODING_DESKTOP_RESIZE_EXT);
vnc_write_u8(vs, 1); /* number of screens */
vnc_write_u8(vs, 0); /* padding */
vnc_write_u8(vs, 0); /* padding */
vnc_write_u8(vs, 0); /* padding */
vnc_write_u32(vs, 0); /* screen id */
vnc_write_u16(vs, 0); /* screen x-pos */
vnc_write_u16(vs, 0); /* screen y-pos */
vnc_write_u16(vs, vs->client_width);
vnc_write_u16(vs, vs->client_height);
vnc_write_u32(vs, 0); /* screen flags */
vnc_unlock_output(vs);
vnc_flush(vs);
}
static void vnc_desktop_resize(VncState *vs)
{
if (vs->ioc == NULL || (!vnc_has_feature(vs, VNC_FEATURE_RESIZE) &&
!vnc_has_feature(vs, VNC_FEATURE_RESIZE_EXT))) {
return;
}
if (vs->client_width == vs->vd->true_width &&
vs->client_height == pixman_image_get_height(vs->vd->server)) {
return;
}
assert(vs->vd->true_width < 65536 &&
vs->vd->true_width >= 0);
assert(pixman_image_get_height(vs->vd->server) < 65536 &&
pixman_image_get_height(vs->vd->server) >= 0);
vs->client_width = vs->vd->true_width;
vs->client_height = pixman_image_get_height(vs->vd->server);
if (vnc_has_feature(vs, VNC_FEATURE_RESIZE_EXT)) {
vnc_desktop_resize_ext(vs, 0);
return;
}
trace_vnc_msg_server_desktop_resize(
vs, vs->ioc, vs->client_width, vs->client_height);
vnc_lock_output(vs);
vnc_write_u8(vs, VNC_MSG_SERVER_FRAMEBUFFER_UPDATE);
vnc_write_u8(vs, 0);
vnc_write_u16(vs, 1); /* number of rects */
vnc_framebuffer_update(vs, 0, 0, vs->client_width, vs->client_height,
VNC_ENCODING_DESKTOPRESIZE);
vnc_unlock_output(vs);
vnc_flush(vs);
}
static void vnc_abort_display_jobs(VncDisplay *vd)
{
VncState *vs;
QTAILQ_FOREACH(vs, &vd->clients, next) {
vnc_lock_output(vs);
vs->abort = true;
vnc_unlock_output(vs);
}
QTAILQ_FOREACH(vs, &vd->clients, next) {
vnc_jobs_join(vs);
}
QTAILQ_FOREACH(vs, &vd->clients, next) {
vnc_lock_output(vs);
if (vs->update == VNC_STATE_UPDATE_NONE &&
vs->job_update != VNC_STATE_UPDATE_NONE) {
/* job aborted before completion */
vs->update = vs->job_update;
vs->job_update = VNC_STATE_UPDATE_NONE;
}
vs->abort = false;
vnc_unlock_output(vs);
}
}
int vnc_server_fb_stride(VncDisplay *vd)
{
return pixman_image_get_stride(vd->server);
}
void *vnc_server_fb_ptr(VncDisplay *vd, int x, int y)
{
uint8_t *ptr;
ptr = (uint8_t *)pixman_image_get_data(vd->server);
ptr += y * vnc_server_fb_stride(vd);
ptr += x * VNC_SERVER_FB_BYTES;
return ptr;
}
static void vnc_update_server_surface(VncDisplay *vd)
{
int width, height;
qemu_pixman_image_unref(vd->server);
vd->server = NULL;
if (QTAILQ_EMPTY(&vd->clients)) {
return;
}
width = vnc_width(vd);
height = vnc_height(vd);
vd->true_width = vnc_true_width(vd);
vd->server = pixman_image_create_bits(VNC_SERVER_FB_FORMAT,
width, height,
NULL, 0);
memset(vd->guest.dirty, 0x00, sizeof(vd->guest.dirty));
vnc_set_area_dirty(vd->guest.dirty, vd, 0, 0,
width, height);
}
static bool vnc_check_pageflip(DisplaySurface *s1,
DisplaySurface *s2)
{
return (s1 != NULL &&
s2 != NULL &&
surface_width(s1) == surface_width(s2) &&
surface_height(s1) == surface_height(s2) &&
surface_format(s1) == surface_format(s2));
}
static void vnc_dpy_switch(DisplayChangeListener *dcl,
DisplaySurface *surface)
{
VncDisplay *vd = container_of(dcl, VncDisplay, dcl);
bool pageflip = vnc_check_pageflip(vd->ds, surface);
VncState *vs;
vnc_abort_display_jobs(vd);
vd->ds = surface;
/* guest surface */
qemu_pixman_image_unref(vd->guest.fb);
vd->guest.fb = pixman_image_ref(surface->image);
vd->guest.format = surface_format(surface);
if (pageflip) {
trace_vnc_server_dpy_pageflip(vd,
surface_width(surface),
surface_height(surface),
surface_format(surface));
vnc_set_area_dirty(vd->guest.dirty, vd, 0, 0,
surface_width(surface),
surface_height(surface));
return;
}
trace_vnc_server_dpy_recreate(vd,
surface_width(surface),
surface_height(surface),
surface_format(surface));
/* server surface */
vnc_update_server_surface(vd);
QTAILQ_FOREACH(vs, &vd->clients, next) {
vnc_colordepth(vs);
vnc_desktop_resize(vs);
vnc_cursor_define(vs);
memset(vs->dirty, 0x00, sizeof(vs->dirty));
vnc_set_area_dirty(vs->dirty, vd, 0, 0,
vnc_width(vd),
vnc_height(vd));
vnc_update_throttle_offset(vs);
}
}
/* fastest code */
static void vnc_write_pixels_copy(VncState *vs,
void *pixels, int size)
{
vnc_write(vs, pixels, size);
}
/* slowest but generic code. */
void vnc_convert_pixel(VncState *vs, uint8_t *buf, uint32_t v)
{
uint8_t r, g, b;
#if VNC_SERVER_FB_FORMAT == PIXMAN_FORMAT(32, PIXMAN_TYPE_ARGB, 0, 8, 8, 8)
r = (((v & 0x00ff0000) >> 16) << vs->client_pf.rbits) >> 8;
g = (((v & 0x0000ff00) >> 8) << vs->client_pf.gbits) >> 8;
b = (((v & 0x000000ff) >> 0) << vs->client_pf.bbits) >> 8;
#else
# error need some bits here if you change VNC_SERVER_FB_FORMAT
#endif
v = (r << vs->client_pf.rshift) |
(g << vs->client_pf.gshift) |
(b << vs->client_pf.bshift);
switch (vs->client_pf.bytes_per_pixel) {
case 1:
buf[0] = v;
break;
case 2:
if (vs->client_be) {
buf[0] = v >> 8;
buf[1] = v;
} else {
buf[1] = v >> 8;
buf[0] = v;
}
break;
default:
case 4:
if (vs->client_be) {
buf[0] = v >> 24;
buf[1] = v >> 16;
buf[2] = v >> 8;
buf[3] = v;
} else {
buf[3] = v >> 24;
buf[2] = v >> 16;
buf[1] = v >> 8;
buf[0] = v;
}
break;
}
}
static void vnc_write_pixels_generic(VncState *vs,
void *pixels1, int size)
{
uint8_t buf[4];
if (VNC_SERVER_FB_BYTES == 4) {
uint32_t *pixels = pixels1;
int n, i;
n = size >> 2;
for (i = 0; i < n; i++) {
vnc_convert_pixel(vs, buf, pixels[i]);
vnc_write(vs, buf, vs->client_pf.bytes_per_pixel);
}
}
}
int vnc_raw_send_framebuffer_update(VncState *vs, int x, int y, int w, int h)
{
int i;
uint8_t *row;
VncDisplay *vd = vs->vd;
row = vnc_server_fb_ptr(vd, x, y);
for (i = 0; i < h; i++) {
vs->write_pixels(vs, row, w * VNC_SERVER_FB_BYTES);
row += vnc_server_fb_stride(vd);
}
return 1;
}
int vnc_send_framebuffer_update(VncState *vs, int x, int y, int w, int h)
{
int n = 0;
switch(vs->vnc_encoding) {
case VNC_ENCODING_ZLIB:
n = vnc_zlib_send_framebuffer_update(vs, x, y, w, h);
break;
case VNC_ENCODING_HEXTILE:
vnc_framebuffer_update(vs, x, y, w, h, VNC_ENCODING_HEXTILE);
n = vnc_hextile_send_framebuffer_update(vs, x, y, w, h);
break;
case VNC_ENCODING_TIGHT:
n = vnc_tight_send_framebuffer_update(vs, x, y, w, h);
break;
case VNC_ENCODING_TIGHT_PNG:
n = vnc_tight_png_send_framebuffer_update(vs, x, y, w, h);
break;
case VNC_ENCODING_ZRLE:
n = vnc_zrle_send_framebuffer_update(vs, x, y, w, h);
break;
case VNC_ENCODING_ZYWRLE:
n = vnc_zywrle_send_framebuffer_update(vs, x, y, w, h);
break;
default:
vnc_framebuffer_update(vs, x, y, w, h, VNC_ENCODING_RAW);
n = vnc_raw_send_framebuffer_update(vs, x, y, w, h);
break;
}
return n;
}
static void vnc_mouse_set(DisplayChangeListener *dcl,
int x, int y, bool visible)
{
/* can we ask the client(s) to move the pointer ??? */
}
static int vnc_cursor_define(VncState *vs)
{
QEMUCursor *c = qemu_console_get_cursor(vs->vd->dcl.con);
int isize;
if (!c) {
return -1;
}
if (vnc_has_feature(vs, VNC_FEATURE_ALPHA_CURSOR)) {
vnc_lock_output(vs);
vnc_write_u8(vs, VNC_MSG_SERVER_FRAMEBUFFER_UPDATE);
vnc_write_u8(vs, 0); /* padding */
vnc_write_u16(vs, 1); /* # of rects */
vnc_framebuffer_update(vs, c->hot_x, c->hot_y, c->width, c->height,
VNC_ENCODING_ALPHA_CURSOR);
vnc_write_s32(vs, VNC_ENCODING_RAW);
vnc_write(vs, c->data, c->width * c->height * 4);
vnc_unlock_output(vs);
return 0;
}
if (vnc_has_feature(vs, VNC_FEATURE_RICH_CURSOR)) {
vnc_lock_output(vs);
vnc_write_u8(vs, VNC_MSG_SERVER_FRAMEBUFFER_UPDATE);
vnc_write_u8(vs, 0); /* padding */
vnc_write_u16(vs, 1); /* # of rects */
vnc_framebuffer_update(vs, c->hot_x, c->hot_y, c->width, c->height,
VNC_ENCODING_RICH_CURSOR);
isize = c->width * c->height * vs->client_pf.bytes_per_pixel;
vnc_write_pixels_generic(vs, c->data, isize);
vnc_write(vs, vs->vd->cursor_mask, vs->vd->cursor_msize);
vnc_unlock_output(vs);
return 0;
}
return -1;
}
static void vnc_dpy_cursor_define(DisplayChangeListener *dcl,
QEMUCursor *c)
{
VncDisplay *vd = container_of(dcl, VncDisplay, dcl);
VncState *vs;
g_free(vd->cursor_mask);
vd->cursor_msize = cursor_get_mono_bpl(c) * c->height;
vd->cursor_mask = g_malloc0(vd->cursor_msize);
cursor_get_mono_mask(c, 0, vd->cursor_mask);
QTAILQ_FOREACH(vs, &vd->clients, next) {
vnc_cursor_define(vs);
}
}
static int find_and_clear_dirty_height(VncState *vs,
int y, int last_x, int x, int height)
{
int h;
for (h = 1; h < (height - y); h++) {
if (!test_bit(last_x, vs->dirty[y + h])) {
break;
}
bitmap_clear(vs->dirty[y + h], last_x, x - last_x);
}
return h;
}
/*
* Figure out how much pending data we should allow in the output
* buffer before we throttle incremental display updates, and/or
* drop audio samples.
*
* We allow for equiv of 1 full display's worth of FB updates,
* and 1 second of audio samples. If audio backlog was larger
* than that the client would already suffering awful audio
* glitches, so dropping samples is no worse really).
*/
static void vnc_update_throttle_offset(VncState *vs)
{
size_t offset =
vs->client_width * vs->client_height * vs->client_pf.bytes_per_pixel;
if (vs->audio_cap) {
int bps;
switch (vs->as.fmt) {
default:
case AUDIO_FORMAT_U8:
case AUDIO_FORMAT_S8:
bps = 1;
break;
case AUDIO_FORMAT_U16:
case AUDIO_FORMAT_S16:
bps = 2;
break;
case AUDIO_FORMAT_U32:
case AUDIO_FORMAT_S32:
bps = 4;
break;
}
offset += vs->as.freq * bps * vs->as.nchannels;
}
/* Put a floor of 1MB on offset, so that if we have a large pending
* buffer and the display is resized to a small size & back again
* we don't suddenly apply a tiny send limit
*/
offset = MAX(offset, 1024 * 1024);
if (vs->throttle_output_offset != offset) {
trace_vnc_client_throttle_threshold(
vs, vs->ioc, vs->throttle_output_offset, offset, vs->client_width,
vs->client_height, vs->client_pf.bytes_per_pixel, vs->audio_cap);
}
vs->throttle_output_offset = offset;
}
static bool vnc_should_update(VncState *vs)
{
switch (vs->update) {
case VNC_STATE_UPDATE_NONE:
break;
case VNC_STATE_UPDATE_INCREMENTAL:
/* Only allow incremental updates if the pending send queue
* is less than the permitted threshold, and the job worker
* is completely idle.
*/
if (vs->output.offset < vs->throttle_output_offset &&
vs->job_update == VNC_STATE_UPDATE_NONE) {
return true;
}
trace_vnc_client_throttle_incremental(
vs, vs->ioc, vs->job_update, vs->output.offset);
break;
case VNC_STATE_UPDATE_FORCE:
/* Only allow forced updates if the pending send queue
* does not contain a previous forced update, and the
* job worker is completely idle.
*
* Note this means we'll queue a forced update, even if
* the output buffer size is otherwise over the throttle
* output limit.
*/
if (vs->force_update_offset == 0 &&
vs->job_update == VNC_STATE_UPDATE_NONE) {
return true;
}
trace_vnc_client_throttle_forced(
vs, vs->ioc, vs->job_update, vs->force_update_offset);
break;
}
return false;
}
static int vnc_update_client(VncState *vs, int has_dirty)
{
VncDisplay *vd = vs->vd;
VncJob *job;
int y;
int height, width;
int n = 0;
if (vs->disconnecting) {
vnc_disconnect_finish(vs);
return 0;
}
vs->has_dirty += has_dirty;
if (!vnc_should_update(vs)) {
return 0;
}
if (!vs->has_dirty && vs->update != VNC_STATE_UPDATE_FORCE) {
return 0;
}
/*
* Send screen updates to the vnc client using the server
* surface and server dirty map. guest surface updates
* happening in parallel don't disturb us, the next pass will
* send them to the client.
*/
job = vnc_job_new(vs);
height = pixman_image_get_height(vd->server);
width = pixman_image_get_width(vd->server);
y = 0;
for (;;) {
int x, h;
unsigned long x2;
unsigned long offset = find_next_bit((unsigned long *) &vs->dirty,
height * VNC_DIRTY_BPL(vs),
y * VNC_DIRTY_BPL(vs));
if (offset == height * VNC_DIRTY_BPL(vs)) {
/* no more dirty bits */
break;
}
y = offset / VNC_DIRTY_BPL(vs);
x = offset % VNC_DIRTY_BPL(vs);
x2 = find_next_zero_bit((unsigned long *) &vs->dirty[y],
VNC_DIRTY_BPL(vs), x);
bitmap_clear(vs->dirty[y], x, x2 - x);
h = find_and_clear_dirty_height(vs, y, x, x2, height);
x2 = MIN(x2, width / VNC_DIRTY_PIXELS_PER_BIT);
if (x2 > x) {
n += vnc_job_add_rect(job, x * VNC_DIRTY_PIXELS_PER_BIT, y,
(x2 - x) * VNC_DIRTY_PIXELS_PER_BIT, h);
}
if (!x && x2 == width / VNC_DIRTY_PIXELS_PER_BIT) {
y += h;
if (y == height) {
break;
}
}
}
vs->job_update = vs->update;
vs->update = VNC_STATE_UPDATE_NONE;
vnc_job_push(job);
vs->has_dirty = 0;
return n;
}
/* audio */
static void audio_capture_notify(void *opaque, audcnotification_e cmd)
{
VncState *vs = opaque;
assert(vs->magic == VNC_MAGIC);
switch (cmd) {
case AUD_CNOTIFY_DISABLE:
trace_vnc_msg_server_audio_end(vs, vs->ioc);
vnc_lock_output(vs);
vnc_write_u8(vs, VNC_MSG_SERVER_QEMU);
vnc_write_u8(vs, VNC_MSG_SERVER_QEMU_AUDIO);
vnc_write_u16(vs, VNC_MSG_SERVER_QEMU_AUDIO_END);
vnc_unlock_output(vs);
vnc_flush(vs);
break;
case AUD_CNOTIFY_ENABLE:
trace_vnc_msg_server_audio_begin(vs, vs->ioc);
vnc_lock_output(vs);
vnc_write_u8(vs, VNC_MSG_SERVER_QEMU);
vnc_write_u8(vs, VNC_MSG_SERVER_QEMU_AUDIO);
vnc_write_u16(vs, VNC_MSG_SERVER_QEMU_AUDIO_BEGIN);
vnc_unlock_output(vs);
vnc_flush(vs);
break;
}
}
static void audio_capture_destroy(void *opaque)
{
}
static void audio_capture(void *opaque, const void *buf, int size)
{
VncState *vs = opaque;
assert(vs->magic == VNC_MAGIC);
trace_vnc_msg_server_audio_data(vs, vs->ioc, buf, size);
vnc_lock_output(vs);
if (vs->output.offset < vs->throttle_output_offset) {
vnc_write_u8(vs, VNC_MSG_SERVER_QEMU);
vnc_write_u8(vs, VNC_MSG_SERVER_QEMU_AUDIO);
vnc_write_u16(vs, VNC_MSG_SERVER_QEMU_AUDIO_DATA);
vnc_write_u32(vs, size);
vnc_write(vs, buf, size);
} else {
trace_vnc_client_throttle_audio(vs, vs->ioc, vs->output.offset);
}
vnc_unlock_output(vs);
vnc_flush(vs);
}
static void audio_add(VncState *vs)
{
struct audio_capture_ops ops;
if (vs->audio_cap) {
error_report("audio already running");
return;
}
ops.notify = audio_capture_notify;
ops.destroy = audio_capture_destroy;
ops.capture = audio_capture;
vs->audio_cap = AUD_add_capture(vs->vd->audio_state, &vs->as, &ops, vs);
if (!vs->audio_cap) {
error_report("Failed to add audio capture");
}
}
static void audio_del(VncState *vs)
{
if (vs->audio_cap) {
AUD_del_capture(vs->audio_cap, vs);
vs->audio_cap = NULL;
}
}
static void vnc_disconnect_start(VncState *vs)
{
if (vs->disconnecting) {
return;
}
trace_vnc_client_disconnect_start(vs, vs->ioc);
vnc_set_share_mode(vs, VNC_SHARE_MODE_DISCONNECTED);
if (vs->ioc_tag) {
g_source_remove(vs->ioc_tag);
vs->ioc_tag = 0;
}
qio_channel_close(vs->ioc, NULL);
vs->disconnecting = TRUE;
}
void vnc_disconnect_finish(VncState *vs)
{
int i;
trace_vnc_client_disconnect_finish(vs, vs->ioc);
vnc_jobs_join(vs); /* Wait encoding jobs */
vnc_lock_output(vs);
vnc_qmp_event(vs, QAPI_EVENT_VNC_DISCONNECTED);
buffer_free(&vs->input);
buffer_free(&vs->output);
qapi_free_VncClientInfo(vs->info);
vnc_zlib_clear(vs);
vnc_tight_clear(vs);
vnc_zrle_clear(vs);
#ifdef CONFIG_VNC_SASL
vnc_sasl_client_cleanup(vs);
#endif /* CONFIG_VNC_SASL */
audio_del(vs);
qkbd_state_lift_all_keys(vs->vd->kbd);
if (vs->mouse_mode_notifier.notify != NULL) {
qemu_remove_mouse_mode_change_notifier(&vs->mouse_mode_notifier);
}
QTAILQ_REMOVE(&vs->vd->clients, vs, next);
if (QTAILQ_EMPTY(&vs->vd->clients)) {
/* last client gone */
vnc_update_server_surface(vs->vd);
}
vnc_unlock_output(vs);
if (vs->cbpeer.notifier.notify) {
qemu_clipboard_peer_unregister(&vs->cbpeer);
}
qemu_mutex_destroy(&vs->output_mutex);
if (vs->bh != NULL) {
qemu_bh_delete(vs->bh);
}
buffer_free(&vs->jobs_buffer);
for (i = 0; i < VNC_STAT_ROWS; ++i) {
g_free(vs->lossy_rect[i]);
}
g_free(vs->lossy_rect);
object_unref(OBJECT(vs->ioc));
vs->ioc = NULL;
object_unref(OBJECT(vs->sioc));
vs->sioc = NULL;
vs->magic = 0;
g_free(vs->zrle);
g_free(vs->tight);
g_free(vs);
}
size_t vnc_client_io_error(VncState *vs, ssize_t ret, Error *err)
{
if (ret <= 0) {
if (ret == 0) {
trace_vnc_client_eof(vs, vs->ioc);
vnc_disconnect_start(vs);
} else if (ret != QIO_CHANNEL_ERR_BLOCK) {
trace_vnc_client_io_error(vs, vs->ioc,
err ? error_get_pretty(err) : "Unknown");
vnc_disconnect_start(vs);
}
error_free(err);
return 0;
}
return ret;
}
void vnc_client_error(VncState *vs)
{
VNC_DEBUG("Closing down client sock: protocol error\n");
vnc_disconnect_start(vs);
}
/*
* Called to write a chunk of data to the client socket. The data may
* be the raw data, or may have already been encoded by SASL.
* The data will be written either straight onto the socket, or
* written via the GNUTLS wrappers, if TLS/SSL encryption is enabled
*
* NB, it is theoretically possible to have 2 layers of encryption,
* both SASL, and this TLS layer. It is highly unlikely in practice
* though, since SASL encryption will typically be a no-op if TLS
* is active
*
* Returns the number of bytes written, which may be less than
* the requested 'datalen' if the socket would block. Returns
* 0 on I/O error, and disconnects the client socket.
*/
size_t vnc_client_write_buf(VncState *vs, const uint8_t *data, size_t datalen)
{
Error *err = NULL;
ssize_t ret;
ret = qio_channel_write(vs->ioc, (const char *)data, datalen, &err);
VNC_DEBUG("Wrote wire %p %zd -> %ld\n", data, datalen, ret);
return vnc_client_io_error(vs, ret, err);
}
/*
* Called to write buffered data to the client socket, when not
* using any SASL SSF encryption layers. Will write as much data
* as possible without blocking. If all buffered data is written,
* will switch the FD poll() handler back to read monitoring.
*
* Returns the number of bytes written, which may be less than
* the buffered output data if the socket would block. Returns
* 0 on I/O error, and disconnects the client socket.
*/
static size_t vnc_client_write_plain(VncState *vs)
{
size_t offset;
size_t ret;
#ifdef CONFIG_VNC_SASL
VNC_DEBUG("Write Plain: Pending output %p size %zd offset %zd. Wait SSF %d\n",
vs->output.buffer, vs->output.capacity, vs->output.offset,
vs->sasl.waitWriteSSF);
if (vs->sasl.conn &&
vs->sasl.runSSF &&
vs->sasl.waitWriteSSF) {
ret = vnc_client_write_buf(vs, vs->output.buffer, vs->sasl.waitWriteSSF);
if (ret)
vs->sasl.waitWriteSSF -= ret;
} else
#endif /* CONFIG_VNC_SASL */
ret = vnc_client_write_buf(vs, vs->output.buffer, vs->output.offset);
if (!ret)
return 0;
if (ret >= vs->force_update_offset) {
if (vs->force_update_offset != 0) {
trace_vnc_client_unthrottle_forced(vs, vs->ioc);
}
vs->force_update_offset = 0;
} else {
vs->force_update_offset -= ret;
}
offset = vs->output.offset;
buffer_advance(&vs->output, ret);
if (offset >= vs->throttle_output_offset &&
vs->output.offset < vs->throttle_output_offset) {
trace_vnc_client_unthrottle_incremental(vs, vs->ioc, vs->output.offset);
}
if (vs->output.offset == 0) {
if (vs->ioc_tag) {
g_source_remove(vs->ioc_tag);
}
vs->ioc_tag = qio_channel_add_watch(
vs->ioc, G_IO_IN | G_IO_HUP | G_IO_ERR,
vnc_client_io, vs, NULL);
}
return ret;
}
/*
* First function called whenever there is data to be written to
* the client socket. Will delegate actual work according to whether
* SASL SSF layers are enabled (thus requiring encryption calls)
*/
static void vnc_client_write_locked(VncState *vs)
{
#ifdef CONFIG_VNC_SASL
if (vs->sasl.conn &&
vs->sasl.runSSF &&
!vs->sasl.waitWriteSSF) {
vnc_client_write_sasl(vs);
} else
#endif /* CONFIG_VNC_SASL */
{
vnc_client_write_plain(vs);
}
}
static void vnc_client_write(VncState *vs)
{
assert(vs->magic == VNC_MAGIC);
vnc_lock_output(vs);
if (vs->output.offset) {
vnc_client_write_locked(vs);
} else if (vs->ioc != NULL) {
if (vs->ioc_tag) {
g_source_remove(vs->ioc_tag);
}
vs->ioc_tag = qio_channel_add_watch(
vs->ioc, G_IO_IN | G_IO_HUP | G_IO_ERR,
vnc_client_io, vs, NULL);
}
vnc_unlock_output(vs);
}
void vnc_read_when(VncState *vs, VncReadEvent *func, size_t expecting)
{
vs->read_handler = func;
vs->read_handler_expect = expecting;
}
/*
* Called to read a chunk of data from the client socket. The data may
* be the raw data, or may need to be further decoded by SASL.
* The data will be read either straight from to the socket, or
* read via the GNUTLS wrappers, if TLS/SSL encryption is enabled
*
* NB, it is theoretically possible to have 2 layers of encryption,
* both SASL, and this TLS layer. It is highly unlikely in practice
* though, since SASL encryption will typically be a no-op if TLS
* is active
*
* Returns the number of bytes read, which may be less than
* the requested 'datalen' if the socket would block. Returns
* 0 on I/O error or EOF, and disconnects the client socket.
*/
size_t vnc_client_read_buf(VncState *vs, uint8_t *data, size_t datalen)
{
ssize_t ret;
Error *err = NULL;
ret = qio_channel_read(vs->ioc, (char *)data, datalen, &err);
VNC_DEBUG("Read wire %p %zd -> %ld\n", data, datalen, ret);
return vnc_client_io_error(vs, ret, err);
}
/*
* Called to read data from the client socket to the input buffer,
* when not using any SASL SSF encryption layers. Will read as much
* data as possible without blocking.
*
* Returns the number of bytes read, which may be less than
* the requested 'datalen' if the socket would block. Returns
* 0 on I/O error or EOF, and disconnects the client socket.
*/
static size_t vnc_client_read_plain(VncState *vs)
{
size_t ret;
VNC_DEBUG("Read plain %p size %zd offset %zd\n",
vs->input.buffer, vs->input.capacity, vs->input.offset);
buffer_reserve(&vs->input, 4096);
ret = vnc_client_read_buf(vs, buffer_end(&vs->input), 4096);
if (!ret)
return 0;
vs->input.offset += ret;
return ret;
}
static void vnc_jobs_bh(void *opaque)
{
VncState *vs = opaque;
assert(vs->magic == VNC_MAGIC);
vnc_jobs_consume_buffer(vs);
}
/*
* First function called whenever there is more data to be read from
* the client socket. Will delegate actual work according to whether
* SASL SSF layers are enabled (thus requiring decryption calls)
* Returns 0 on success, -1 if client disconnected
*/
static int vnc_client_read(VncState *vs)
{
size_t sz;
#ifdef CONFIG_VNC_SASL
if (vs->sasl.conn && vs->sasl.runSSF)
sz = vnc_client_read_sasl(vs);
else
#endif /* CONFIG_VNC_SASL */
sz = vnc_client_read_plain(vs);
if (!sz) {
if (vs->disconnecting) {
vnc_disconnect_finish(vs);
return -1;
}
return 0;
}
while (vs->read_handler && vs->input.offset >= vs->read_handler_expect) {
size_t len = vs->read_handler_expect;
int ret;
ret = vs->read_handler(vs, vs->input.buffer, len);
if (vs->disconnecting) {
vnc_disconnect_finish(vs);
return -1;
}
if (!ret) {
buffer_advance(&vs->input, len);
} else {
vs->read_handler_expect = ret;
}
}
return 0;
}
gboolean vnc_client_io(QIOChannel *ioc G_GNUC_UNUSED,
GIOCondition condition, void *opaque)
{
VncState *vs = opaque;
assert(vs->magic == VNC_MAGIC);
if (condition & (G_IO_HUP | G_IO_ERR)) {
vnc_disconnect_start(vs);
return TRUE;
}
if (condition & G_IO_IN) {
if (vnc_client_read(vs) < 0) {
/* vs is free()ed here */
return TRUE;
}
}
if (condition & G_IO_OUT) {
vnc_client_write(vs);
}
if (vs->disconnecting) {
if (vs->ioc_tag != 0) {
g_source_remove(vs->ioc_tag);
}
vs->ioc_tag = 0;
}
return TRUE;
}
/*
* Scale factor to apply to vs->throttle_output_offset when checking for
* hard limit. Worst case normal usage could be x2, if we have a complete
* incremental update and complete forced update in the output buffer.
* So x3 should be good enough, but we pick x5 to be conservative and thus
* (hopefully) never trigger incorrectly.
*/
#define VNC_THROTTLE_OUTPUT_LIMIT_SCALE 5
void vnc_write(VncState *vs, const void *data, size_t len)
{
assert(vs->magic == VNC_MAGIC);
if (vs->disconnecting) {
return;
}
/* Protection against malicious client/guest to prevent our output
* buffer growing without bound if client stops reading data. This
* should rarely trigger, because we have earlier throttling code
* which stops issuing framebuffer updates and drops audio data
* if the throttle_output_offset value is exceeded. So we only reach
* this higher level if a huge number of pseudo-encodings get
* triggered while data can't be sent on the socket.
*
* NB throttle_output_offset can be zero during early protocol
* handshake, or from the job thread's VncState clone
*/
if (vs->throttle_output_offset != 0 &&
(vs->output.offset / VNC_THROTTLE_OUTPUT_LIMIT_SCALE) >
vs->throttle_output_offset) {
trace_vnc_client_output_limit(vs, vs->ioc, vs->output.offset,
vs->throttle_output_offset);
vnc_disconnect_start(vs);
return;
}
buffer_reserve(&vs->output, len);
if (vs->ioc != NULL && buffer_empty(&vs->output)) {
if (vs->ioc_tag) {
g_source_remove(vs->ioc_tag);
}
vs->ioc_tag = qio_channel_add_watch(
vs->ioc, G_IO_IN | G_IO_HUP | G_IO_ERR | G_IO_OUT,
vnc_client_io, vs, NULL);
}
buffer_append(&vs->output, data, len);
}
void vnc_write_s32(VncState *vs, int32_t value)
{
vnc_write_u32(vs, *(uint32_t *)&value);
}
void vnc_write_u32(VncState *vs, uint32_t value)
{
uint8_t buf[4];
buf[0] = (value >> 24) & 0xFF;
buf[1] = (value >> 16) & 0xFF;
buf[2] = (value >> 8) & 0xFF;
buf[3] = value & 0xFF;
vnc_write(vs, buf, 4);
}
void vnc_write_u16(VncState *vs, uint16_t value)
{
uint8_t buf[2];
buf[0] = (value >> 8) & 0xFF;
buf[1] = value & 0xFF;
vnc_write(vs, buf, 2);
}
void vnc_write_u8(VncState *vs, uint8_t value)
{
vnc_write(vs, (char *)&value, 1);
}
void vnc_flush(VncState *vs)
{
vnc_lock_output(vs);
if (vs->ioc != NULL && vs->output.offset) {
vnc_client_write_locked(vs);
}
if (vs->disconnecting) {
if (vs->ioc_tag != 0) {
g_source_remove(vs->ioc_tag);
}
vs->ioc_tag = 0;
}
vnc_unlock_output(vs);
}
static uint8_t read_u8(uint8_t *data, size_t offset)
{
return data[offset];
}
static uint16_t read_u16(uint8_t *data, size_t offset)
{
return ((data[offset] & 0xFF) << 8) | (data[offset + 1] & 0xFF);
}
static int32_t read_s32(uint8_t *data, size_t offset)
{
return (int32_t)((data[offset] << 24) | (data[offset + 1] << 16) |
(data[offset + 2] << 8) | data[offset + 3]);
}
uint32_t read_u32(uint8_t *data, size_t offset)
{
return ((data[offset] << 24) | (data[offset + 1] << 16) |
(data[offset + 2] << 8) | data[offset + 3]);
}
static void check_pointer_type_change(Notifier *notifier, void *data)
{
VncState *vs = container_of(notifier, VncState, mouse_mode_notifier);
int absolute = qemu_input_is_absolute(vs->vd->dcl.con);
if (vnc_has_feature(vs, VNC_FEATURE_POINTER_TYPE_CHANGE) && vs->absolute != absolute) {
vnc_lock_output(vs);
vnc_write_u8(vs, VNC_MSG_SERVER_FRAMEBUFFER_UPDATE);
vnc_write_u8(vs, 0);
vnc_write_u16(vs, 1);
vnc_framebuffer_update(vs, absolute, 0,
pixman_image_get_width(vs->vd->server),
pixman_image_get_height(vs->vd->server),
VNC_ENCODING_POINTER_TYPE_CHANGE);
vnc_unlock_output(vs);
vnc_flush(vs);
}
vs->absolute = absolute;
}
static void pointer_event(VncState *vs, int button_mask, int x, int y)
{
static uint32_t bmap[INPUT_BUTTON__MAX] = {
[INPUT_BUTTON_LEFT] = 0x01,
[INPUT_BUTTON_MIDDLE] = 0x02,
[INPUT_BUTTON_RIGHT] = 0x04,
[INPUT_BUTTON_WHEEL_UP] = 0x08,
[INPUT_BUTTON_WHEEL_DOWN] = 0x10,
};
QemuConsole *con = vs->vd->dcl.con;
int width = pixman_image_get_width(vs->vd->server);
int height = pixman_image_get_height(vs->vd->server);
if (vs->last_bmask != button_mask) {
qemu_input_update_buttons(con, bmap, vs->last_bmask, button_mask);
vs->last_bmask = button_mask;
}
if (vs->absolute) {
qemu_input_queue_abs(con, INPUT_AXIS_X, x, 0, width);
qemu_input_queue_abs(con, INPUT_AXIS_Y, y, 0, height);
} else if (vnc_has_feature(vs, VNC_FEATURE_POINTER_TYPE_CHANGE)) {
qemu_input_queue_rel(con, INPUT_AXIS_X, x - 0x7FFF);
qemu_input_queue_rel(con, INPUT_AXIS_Y, y - 0x7FFF);
} else {
if (vs->last_x != -1) {
qemu_input_queue_rel(con, INPUT_AXIS_X, x - vs->last_x);
qemu_input_queue_rel(con, INPUT_AXIS_Y, y - vs->last_y);
}
vs->last_x = x;
vs->last_y = y;
}
qemu_input_event_sync();
}
static void press_key(VncState *vs, QKeyCode qcode)
{
qkbd_state_key_event(vs->vd->kbd, qcode, true);
qkbd_state_key_event(vs->vd->kbd, qcode, false);
}
static void vnc_led_state_change(VncState *vs)
{
if (!vnc_has_feature(vs, VNC_FEATURE_LED_STATE)) {
return;
}
vnc_lock_output(vs);
vnc_write_u8(vs, VNC_MSG_SERVER_FRAMEBUFFER_UPDATE);
vnc_write_u8(vs, 0);
vnc_write_u16(vs, 1);
vnc_framebuffer_update(vs, 0, 0, 1, 1, VNC_ENCODING_LED_STATE);
vnc_write_u8(vs, vs->vd->ledstate);
vnc_unlock_output(vs);
vnc_flush(vs);
}
static void kbd_leds(void *opaque, int ledstate)
{
VncDisplay *vd = opaque;
VncState *client;
trace_vnc_key_guest_leds((ledstate & QEMU_CAPS_LOCK_LED),
(ledstate & QEMU_NUM_LOCK_LED),
(ledstate & QEMU_SCROLL_LOCK_LED));
if (ledstate == vd->ledstate) {
return;
}
vd->ledstate = ledstate;
QTAILQ_FOREACH(client, &vd->clients, next) {
vnc_led_state_change(client);
}
}
static void do_key_event(VncState *vs, int down, int keycode, int sym)
{
QKeyCode qcode = qemu_input_key_number_to_qcode(keycode);
/* QEMU console switch */
switch (qcode) {
case Q_KEY_CODE_1 ... Q_KEY_CODE_9: /* '1' to '9' keys */
if (down &&
qkbd_state_modifier_get(vs->vd->kbd, QKBD_MOD_CTRL) &&
qkbd_state_modifier_get(vs->vd->kbd, QKBD_MOD_ALT)) {
QemuConsole *con = qemu_console_lookup_by_index(qcode - Q_KEY_CODE_1);
if (con) {
unregister_displaychangelistener(&vs->vd->dcl);
qkbd_state_switch_console(vs->vd->kbd, con);
vs->vd->dcl.con = con;
register_displaychangelistener(&vs->vd->dcl);
}
return;
}
default:
break;
}
/* Turn off the lock state sync logic if the client support the led
state extension.
*/
if (down && vs->vd->lock_key_sync &&
!vnc_has_feature(vs, VNC_FEATURE_LED_STATE) &&
keycode_is_keypad(vs->vd->kbd_layout, keycode)) {
/* If the numlock state needs to change then simulate an additional
keypress before sending this one. This will happen if the user
toggles numlock away from the VNC window.
*/
if (keysym_is_numlock(vs->vd->kbd_layout, sym & 0xFFFF)) {
if (!qkbd_state_modifier_get(vs->vd->kbd, QKBD_MOD_NUMLOCK)) {
trace_vnc_key_sync_numlock(true);
press_key(vs, Q_KEY_CODE_NUM_LOCK);
}
} else {
if (qkbd_state_modifier_get(vs->vd->kbd, QKBD_MOD_NUMLOCK)) {
trace_vnc_key_sync_numlock(false);
press_key(vs, Q_KEY_CODE_NUM_LOCK);
}
}
}
if (down && vs->vd->lock_key_sync &&
!vnc_has_feature(vs, VNC_FEATURE_LED_STATE) &&
((sym >= 'A' && sym <= 'Z') || (sym >= 'a' && sym <= 'z'))) {
/* If the capslock state needs to change then simulate an additional
keypress before sending this one. This will happen if the user
toggles capslock away from the VNC window.
*/
int uppercase = !!(sym >= 'A' && sym <= 'Z');
bool shift = qkbd_state_modifier_get(vs->vd->kbd, QKBD_MOD_SHIFT);
bool capslock = qkbd_state_modifier_get(vs->vd->kbd, QKBD_MOD_CAPSLOCK);
if (capslock) {
if (uppercase == shift) {
trace_vnc_key_sync_capslock(false);
press_key(vs, Q_KEY_CODE_CAPS_LOCK);
}
} else {
if (uppercase != shift) {
trace_vnc_key_sync_capslock(true);
press_key(vs, Q_KEY_CODE_CAPS_LOCK);
}
}
}
qkbd_state_key_event(vs->vd->kbd, qcode, down);
if (QEMU_IS_TEXT_CONSOLE(vs->vd->dcl.con)) {
QemuTextConsole *con = QEMU_TEXT_CONSOLE(vs->vd->dcl.con);
bool numlock = qkbd_state_modifier_get(vs->vd->kbd, QKBD_MOD_NUMLOCK);
bool control = qkbd_state_modifier_get(vs->vd->kbd, QKBD_MOD_CTRL);
/* QEMU console emulation */
if (down) {
switch (keycode) {
case 0x2a: /* Left Shift */
case 0x36: /* Right Shift */
case 0x1d: /* Left CTRL */
case 0x9d: /* Right CTRL */
case 0x38: /* Left ALT */
case 0xb8: /* Right ALT */
break;
case 0xc8:
qemu_text_console_put_keysym(con, QEMU_KEY_UP);
break;
case 0xd0:
qemu_text_console_put_keysym(con, QEMU_KEY_DOWN);
break;
case 0xcb:
qemu_text_console_put_keysym(con, QEMU_KEY_LEFT);
break;
case 0xcd:
qemu_text_console_put_keysym(con, QEMU_KEY_RIGHT);
break;
case 0xd3:
qemu_text_console_put_keysym(con, QEMU_KEY_DELETE);
break;
case 0xc7:
qemu_text_console_put_keysym(con, QEMU_KEY_HOME);
break;
case 0xcf:
qemu_text_console_put_keysym(con, QEMU_KEY_END);
break;
case 0xc9:
qemu_text_console_put_keysym(con, QEMU_KEY_PAGEUP);
break;
case 0xd1:
qemu_text_console_put_keysym(con, QEMU_KEY_PAGEDOWN);
break;
case 0x47:
qemu_text_console_put_keysym(con, numlock ? '7' : QEMU_KEY_HOME);
break;
case 0x48:
qemu_text_console_put_keysym(con, numlock ? '8' : QEMU_KEY_UP);
break;
case 0x49:
qemu_text_console_put_keysym(con, numlock ? '9' : QEMU_KEY_PAGEUP);
break;
case 0x4b:
qemu_text_console_put_keysym(con, numlock ? '4' : QEMU_KEY_LEFT);
break;
case 0x4c:
qemu_text_console_put_keysym(con, '5');
break;
case 0x4d:
qemu_text_console_put_keysym(con, numlock ? '6' : QEMU_KEY_RIGHT);
break;
case 0x4f:
qemu_text_console_put_keysym(con, numlock ? '1' : QEMU_KEY_END);
break;
case 0x50:
qemu_text_console_put_keysym(con, numlock ? '2' : QEMU_KEY_DOWN);
break;
case 0x51:
qemu_text_console_put_keysym(con, numlock ? '3' : QEMU_KEY_PAGEDOWN);
break;
case 0x52:
qemu_text_console_put_keysym(con, '0');
break;
case 0x53:
qemu_text_console_put_keysym(con, numlock ? '.' : QEMU_KEY_DELETE);
break;
case 0xb5:
qemu_text_console_put_keysym(con, '/');
break;
case 0x37:
qemu_text_console_put_keysym(con, '*');
break;
case 0x4a:
qemu_text_console_put_keysym(con, '-');
break;
case 0x4e:
qemu_text_console_put_keysym(con, '+');
break;
case 0x9c:
qemu_text_console_put_keysym(con, '\n');
break;
default:
if (control) {
qemu_text_console_put_keysym(con, sym & 0x1f);
} else {
qemu_text_console_put_keysym(con, sym);
}
break;
}
}
}
}
static const char *code2name(int keycode)
{
return QKeyCode_str(qemu_input_key_number_to_qcode(keycode));
}
static void key_event(VncState *vs, int down, uint32_t sym)
{
int keycode;
int lsym = sym;
if (lsym >= 'A' && lsym <= 'Z' && qemu_console_is_graphic(vs->vd->dcl.con)) {
lsym = lsym - 'A' + 'a';
}
keycode = keysym2scancode(vs->vd->kbd_layout, lsym & 0xFFFF,
vs->vd->kbd, down) & SCANCODE_KEYMASK;
trace_vnc_key_event_map(down, sym, keycode, code2name(keycode));
do_key_event(vs, down, keycode, sym);
}
static void ext_key_event(VncState *vs, int down,
uint32_t sym, uint16_t keycode)
{
/* if the user specifies a keyboard layout, always use it */
if (keyboard_layout) {
key_event(vs, down, sym);
} else {
trace_vnc_key_event_ext(down, sym, keycode, code2name(keycode));
do_key_event(vs, down, keycode, sym);
}
}
static void framebuffer_update_request(VncState *vs, int incremental,
int x, int y, int w, int h)
{
if (incremental) {
if (vs->update != VNC_STATE_UPDATE_FORCE) {
vs->update = VNC_STATE_UPDATE_INCREMENTAL;
}
} else {
vs->update = VNC_STATE_UPDATE_FORCE;
vnc_set_area_dirty(vs->dirty, vs->vd, x, y, w, h);
if (vnc_has_feature(vs, VNC_FEATURE_RESIZE_EXT)) {
vnc_desktop_resize_ext(vs, 0);
}
}
}
static void send_ext_key_event_ack(VncState *vs)
{
vnc_lock_output(vs);
vnc_write_u8(vs, VNC_MSG_SERVER_FRAMEBUFFER_UPDATE);
vnc_write_u8(vs, 0);
vnc_write_u16(vs, 1);
vnc_framebuffer_update(vs, 0, 0,
pixman_image_get_width(vs->vd->server),
pixman_image_get_height(vs->vd->server),
VNC_ENCODING_EXT_KEY_EVENT);
vnc_unlock_output(vs);
vnc_flush(vs);
}
static void send_ext_audio_ack(VncState *vs)
{
vnc_lock_output(vs);
vnc_write_u8(vs, VNC_MSG_SERVER_FRAMEBUFFER_UPDATE);
vnc_write_u8(vs, 0);
vnc_write_u16(vs, 1);
vnc_framebuffer_update(vs, 0, 0,
pixman_image_get_width(vs->vd->server),
pixman_image_get_height(vs->vd->server),
VNC_ENCODING_AUDIO);
vnc_unlock_output(vs);
vnc_flush(vs);
}
static void send_xvp_message(VncState *vs, int code)
{
vnc_lock_output(vs);
vnc_write_u8(vs, VNC_MSG_SERVER_XVP);
vnc_write_u8(vs, 0); /* pad */
vnc_write_u8(vs, 1); /* version */
vnc_write_u8(vs, code);
vnc_unlock_output(vs);
vnc_flush(vs);
}
static void set_encodings(VncState *vs, int32_t *encodings, size_t n_encodings)
{
int i;
unsigned int enc = 0;
vs->features = 0;
vs->vnc_encoding = 0;
vs->tight->compression = 9;
vs->tight->quality = -1; /* Lossless by default */
vs->absolute = -1;
/*
* Start from the end because the encodings are sent in order of preference.
* This way the preferred encoding (first encoding defined in the array)
* will be set at the end of the loop.
*/
for (i = n_encodings - 1; i >= 0; i--) {
enc = encodings[i];
switch (enc) {
case VNC_ENCODING_RAW:
vs->vnc_encoding = enc;
break;
case VNC_ENCODING_HEXTILE:
vnc_set_feature(vs, VNC_FEATURE_HEXTILE);
vs->vnc_encoding = enc;
break;
case VNC_ENCODING_TIGHT:
vnc_set_feature(vs, VNC_FEATURE_TIGHT);
vs->vnc_encoding = enc;
break;
#ifdef CONFIG_PNG
case VNC_ENCODING_TIGHT_PNG:
vnc_set_feature(vs, VNC_FEATURE_TIGHT_PNG);
vs->vnc_encoding = enc;
break;
#endif
case VNC_ENCODING_ZLIB:
/*
* VNC_ENCODING_ZRLE compresses better than VNC_ENCODING_ZLIB.
* So prioritize ZRLE, even if the client hints that it prefers
* ZLIB.
*/
if (!vnc_has_feature(vs, VNC_FEATURE_ZRLE)) {
vnc_set_feature(vs, VNC_FEATURE_ZLIB);
vs->vnc_encoding = enc;
}
break;
case VNC_ENCODING_ZRLE:
vnc_set_feature(vs, VNC_FEATURE_ZRLE);
vs->vnc_encoding = enc;
break;
case VNC_ENCODING_ZYWRLE:
vnc_set_feature(vs, VNC_FEATURE_ZYWRLE);
vs->vnc_encoding = enc;
break;
case VNC_ENCODING_DESKTOPRESIZE:
vnc_set_feature(vs, VNC_FEATURE_RESIZE);
break;
case VNC_ENCODING_DESKTOP_RESIZE_EXT:
vnc_set_feature(vs, VNC_FEATURE_RESIZE_EXT);
break;
case VNC_ENCODING_POINTER_TYPE_CHANGE:
vnc_set_feature(vs, VNC_FEATURE_POINTER_TYPE_CHANGE);
break;
case VNC_ENCODING_RICH_CURSOR:
vnc_set_feature(vs, VNC_FEATURE_RICH_CURSOR);
break;
case VNC_ENCODING_ALPHA_CURSOR:
vnc_set_feature(vs, VNC_FEATURE_ALPHA_CURSOR);
break;
case VNC_ENCODING_EXT_KEY_EVENT:
send_ext_key_event_ack(vs);
break;
case VNC_ENCODING_AUDIO:
if (vs->vd->audio_state) {
vnc_set_feature(vs, VNC_FEATURE_AUDIO);
send_ext_audio_ack(vs);
}
break;
case VNC_ENCODING_WMVi:
vnc_set_feature(vs, VNC_FEATURE_WMVI);
break;
case VNC_ENCODING_LED_STATE:
vnc_set_feature(vs, VNC_FEATURE_LED_STATE);
break;
case VNC_ENCODING_XVP:
if (vs->vd->power_control) {
vnc_set_feature(vs, VNC_FEATURE_XVP);
send_xvp_message(vs, VNC_XVP_CODE_INIT);
}
break;
case VNC_ENCODING_CLIPBOARD_EXT:
vnc_set_feature(vs, VNC_FEATURE_CLIPBOARD_EXT);
vnc_server_cut_text_caps(vs);
break;
case VNC_ENCODING_COMPRESSLEVEL0 ... VNC_ENCODING_COMPRESSLEVEL0 + 9:
vs->tight->compression = (enc & 0x0F);
break;
case VNC_ENCODING_QUALITYLEVEL0 ... VNC_ENCODING_QUALITYLEVEL0 + 9:
if (vs->vd->lossy) {
vs->tight->quality = (enc & 0x0F);
}
break;
default:
VNC_DEBUG("Unknown encoding: %d (0x%.8x): %d\n", i, enc, enc);
break;
}
}
vnc_desktop_resize(vs);
check_pointer_type_change(&vs->mouse_mode_notifier, NULL);
vnc_led_state_change(vs);
vnc_cursor_define(vs);
}
static void set_pixel_conversion(VncState *vs)
{
pixman_format_code_t fmt = qemu_pixman_get_format(&vs->client_pf);
if (fmt == VNC_SERVER_FB_FORMAT) {
vs->write_pixels = vnc_write_pixels_copy;
vnc_hextile_set_pixel_conversion(vs, 0);
} else {
vs->write_pixels = vnc_write_pixels_generic;
vnc_hextile_set_pixel_conversion(vs, 1);
}
}
static void send_color_map(VncState *vs)
{
int i;
vnc_lock_output(vs);
vnc_write_u8(vs, VNC_MSG_SERVER_SET_COLOUR_MAP_ENTRIES);
vnc_write_u8(vs, 0); /* padding */
vnc_write_u16(vs, 0); /* first color */
vnc_write_u16(vs, 256); /* # of colors */
for (i = 0; i < 256; i++) {
PixelFormat *pf = &vs->client_pf;
vnc_write_u16(vs, (((i >> pf->rshift) & pf->rmax) << (16 - pf->rbits)));
vnc_write_u16(vs, (((i >> pf->gshift) & pf->gmax) << (16 - pf->gbits)));
vnc_write_u16(vs, (((i >> pf->bshift) & pf->bmax) << (16 - pf->bbits)));
}
vnc_unlock_output(vs);
}
static void set_pixel_format(VncState *vs, int bits_per_pixel,
int big_endian_flag, int true_color_flag,
int red_max, int green_max, int blue_max,
int red_shift, int green_shift, int blue_shift)
{
if (!true_color_flag) {
/* Expose a reasonable default 256 color map */
bits_per_pixel = 8;
red_max = 7;
green_max = 7;
blue_max = 3;
red_shift = 0;
green_shift = 3;
blue_shift = 6;
}
switch (bits_per_pixel) {
case 8:
case 16:
case 32:
break;
default:
vnc_client_error(vs);
return;
}
vs->client_pf.rmax = red_max ? red_max : 0xFF;
vs->client_pf.rbits = ctpopl(red_max);
vs->client_pf.rshift = red_shift;
vs->client_pf.rmask = red_max << red_shift;
vs->client_pf.gmax = green_max ? green_max : 0xFF;
vs->client_pf.gbits = ctpopl(green_max);
vs->client_pf.gshift = green_shift;
vs->client_pf.gmask = green_max << green_shift;
vs->client_pf.bmax = blue_max ? blue_max : 0xFF;
vs->client_pf.bbits = ctpopl(blue_max);
vs->client_pf.bshift = blue_shift;
vs->client_pf.bmask = blue_max << blue_shift;
vs->client_pf.bits_per_pixel = bits_per_pixel;
vs->client_pf.bytes_per_pixel = bits_per_pixel / 8;
vs->client_pf.depth = bits_per_pixel == 32 ? 24 : bits_per_pixel;
vs->client_be = big_endian_flag;
if (!true_color_flag) {
send_color_map(vs);
}
set_pixel_conversion(vs);
graphic_hw_invalidate(vs->vd->dcl.con);
graphic_hw_update(vs->vd->dcl.con);
}
static void pixel_format_message (VncState *vs) {
char pad[3] = { 0, 0, 0 };
vs->client_pf = qemu_default_pixelformat(32);
vnc_write_u8(vs, vs->client_pf.bits_per_pixel); /* bits-per-pixel */
vnc_write_u8(vs, vs->client_pf.depth); /* depth */
#if HOST_BIG_ENDIAN
vnc_write_u8(vs, 1); /* big-endian-flag */
#else
vnc_write_u8(vs, 0); /* big-endian-flag */
#endif
vnc_write_u8(vs, 1); /* true-color-flag */
vnc_write_u16(vs, vs->client_pf.rmax); /* red-max */
vnc_write_u16(vs, vs->client_pf.gmax); /* green-max */
vnc_write_u16(vs, vs->client_pf.bmax); /* blue-max */
vnc_write_u8(vs, vs->client_pf.rshift); /* red-shift */
vnc_write_u8(vs, vs->client_pf.gshift); /* green-shift */
vnc_write_u8(vs, vs->client_pf.bshift); /* blue-shift */
vnc_write(vs, pad, 3); /* padding */
vnc_hextile_set_pixel_conversion(vs, 0);
vs->write_pixels = vnc_write_pixels_copy;
}
static void vnc_colordepth(VncState *vs)
{
if (vnc_has_feature(vs, VNC_FEATURE_WMVI)) {
/* Sending a WMVi message to notify the client*/
vnc_lock_output(vs);
vnc_write_u8(vs, VNC_MSG_SERVER_FRAMEBUFFER_UPDATE);
vnc_write_u8(vs, 0);
vnc_write_u16(vs, 1); /* number of rects */
vnc_framebuffer_update(vs, 0, 0,
vs->client_width,
vs->client_height,
VNC_ENCODING_WMVi);
pixel_format_message(vs);
vnc_unlock_output(vs);
vnc_flush(vs);
} else {
set_pixel_conversion(vs);
}
}
static int protocol_client_msg(VncState *vs, uint8_t *data, size_t len)
{
int i;
uint16_t limit;
uint32_t freq;
VncDisplay *vd = vs->vd;
if (data[0] > 3) {
update_displaychangelistener(&vd->dcl, VNC_REFRESH_INTERVAL_BASE);
}
switch (data[0]) {
case VNC_MSG_CLIENT_SET_PIXEL_FORMAT:
if (len == 1)
return 20;
set_pixel_format(vs, read_u8(data, 4),
read_u8(data, 6), read_u8(data, 7),
read_u16(data, 8), read_u16(data, 10),
read_u16(data, 12), read_u8(data, 14),
read_u8(data, 15), read_u8(data, 16));
break;
case VNC_MSG_CLIENT_SET_ENCODINGS:
if (len == 1)
return 4;
if (len == 4) {
limit = read_u16(data, 2);
if (limit > 0)
return 4 + (limit * 4);
} else
limit = read_u16(data, 2);
for (i = 0; i < limit; i++) {
int32_t val = read_s32(data, 4 + (i * 4));
memcpy(data + 4 + (i * 4), &val, sizeof(val));
}
set_encodings(vs, (int32_t *)(data + 4), limit);
break;
case VNC_MSG_CLIENT_FRAMEBUFFER_UPDATE_REQUEST:
if (len == 1)
return 10;
framebuffer_update_request(vs,
read_u8(data, 1), read_u16(data, 2), read_u16(data, 4),
read_u16(data, 6), read_u16(data, 8));
break;
case VNC_MSG_CLIENT_KEY_EVENT:
if (len == 1)
return 8;
key_event(vs, read_u8(data, 1), read_u32(data, 4));
break;
case VNC_MSG_CLIENT_POINTER_EVENT:
if (len == 1)
return 6;
pointer_event(vs, read_u8(data, 1), read_u16(data, 2), read_u16(data, 4));
break;
case VNC_MSG_CLIENT_CUT_TEXT:
if (len == 1) {
return 8;
}
uint32_t dlen = abs(read_s32(data, 4));
if (len == 8) {
if (dlen > (1 << 20)) {
error_report("vnc: client_cut_text msg payload has %u bytes"
" which exceeds our limit of 1MB.", dlen);
vnc_client_error(vs);
break;
}
if (dlen > 0) {
return 8 + dlen;
}
}
if (read_s32(data, 4) < 0) {
if (!vnc_has_feature(vs, VNC_FEATURE_CLIPBOARD_EXT)) {
error_report("vnc: extended clipboard message while disabled");
vnc_client_error(vs);
break;
}
if (dlen < 4) {
error_report("vnc: malformed payload (header less than 4 bytes)"
" in extended clipboard pseudo-encoding.");
vnc_client_error(vs);
break;
}
vnc_client_cut_text_ext(vs, dlen, read_u32(data, 8), data + 12);
break;
}
vnc_client_cut_text(vs, read_u32(data, 4), data + 8);
break;
case VNC_MSG_CLIENT_XVP:
if (!vnc_has_feature(vs, VNC_FEATURE_XVP)) {
error_report("vnc: xvp client message while disabled");
vnc_client_error(vs);
break;
}
if (len == 1) {
return 4;
}
if (len == 4) {
uint8_t version = read_u8(data, 2);
uint8_t action = read_u8(data, 3);
if (version != 1) {
error_report("vnc: xvp client message version %d != 1",
version);
vnc_client_error(vs);
break;
}
switch (action) {
case VNC_XVP_ACTION_SHUTDOWN:
qemu_system_powerdown_request();
break;
case VNC_XVP_ACTION_REBOOT:
send_xvp_message(vs, VNC_XVP_CODE_FAIL);
break;
case VNC_XVP_ACTION_RESET:
qemu_system_reset_request(SHUTDOWN_CAUSE_HOST_QMP_SYSTEM_RESET);
break;
default:
send_xvp_message(vs, VNC_XVP_CODE_FAIL);
break;
}
}
break;
case VNC_MSG_CLIENT_QEMU:
if (len == 1)
return 2;
switch (read_u8(data, 1)) {
case VNC_MSG_CLIENT_QEMU_EXT_KEY_EVENT:
if (len == 2)
return 12;
ext_key_event(vs, read_u16(data, 2),
read_u32(data, 4), read_u32(data, 8));
break;
case VNC_MSG_CLIENT_QEMU_AUDIO:
if (!vnc_has_feature(vs, VNC_FEATURE_AUDIO)) {
error_report("Audio message %d with audio disabled", read_u8(data, 2));
vnc_client_error(vs);
break;
}
if (len == 2)
return 4;
switch (read_u16 (data, 2)) {
case VNC_MSG_CLIENT_QEMU_AUDIO_ENABLE:
trace_vnc_msg_client_audio_enable(vs, vs->ioc);
audio_add(vs);
break;
case VNC_MSG_CLIENT_QEMU_AUDIO_DISABLE:
trace_vnc_msg_client_audio_disable(vs, vs->ioc);
audio_del(vs);
break;
case VNC_MSG_CLIENT_QEMU_AUDIO_SET_FORMAT:
if (len == 4)
return 10;
switch (read_u8(data, 4)) {
case 0: vs->as.fmt = AUDIO_FORMAT_U8; break;
case 1: vs->as.fmt = AUDIO_FORMAT_S8; break;
case 2: vs->as.fmt = AUDIO_FORMAT_U16; break;
case 3: vs->as.fmt = AUDIO_FORMAT_S16; break;
case 4: vs->as.fmt = AUDIO_FORMAT_U32; break;
case 5: vs->as.fmt = AUDIO_FORMAT_S32; break;
default:
VNC_DEBUG("Invalid audio format %d\n", read_u8(data, 4));
vnc_client_error(vs);
break;
}
vs->as.nchannels = read_u8(data, 5);
if (vs->as.nchannels != 1 && vs->as.nchannels != 2) {
VNC_DEBUG("Invalid audio channel count %d\n",
read_u8(data, 5));
vnc_client_error(vs);
break;
}
freq = read_u32(data, 6);
/* No official limit for protocol, but 48khz is a sensible
* upper bound for trustworthy clients, and this limit
* protects calculations involving 'vs->as.freq' later.
*/
if (freq > 48000) {
VNC_DEBUG("Invalid audio frequency %u > 48000", freq);
vnc_client_error(vs);
break;
}
vs->as.freq = freq;
trace_vnc_msg_client_audio_format(
vs, vs->ioc, vs->as.fmt, vs->as.nchannels, vs->as.freq);
break;
default:
VNC_DEBUG("Invalid audio message %d\n", read_u8(data, 2));
vnc_client_error(vs);
break;
}
break;
default:
VNC_DEBUG("Msg: %d\n", read_u16(data, 0));
vnc_client_error(vs);
break;
}
break;
case VNC_MSG_CLIENT_SET_DESKTOP_SIZE:
{
size_t size;
uint8_t screens;
int w, h;
if (len < 8) {
return 8;
}
screens = read_u8(data, 6);
size = 8 + screens * 16;
if (len < size) {
return size;
}
w = read_u16(data, 2);
h = read_u16(data, 4);
trace_vnc_msg_client_set_desktop_size(vs, vs->ioc, w, h, screens);
if (dpy_ui_info_supported(vs->vd->dcl.con)) {
QemuUIInfo info;
memset(&info, 0, sizeof(info));
info.width = w;
info.height = h;
dpy_set_ui_info(vs->vd->dcl.con, &info, false);
vnc_desktop_resize_ext(vs, 4 /* Request forwarded */);
} else {
vnc_desktop_resize_ext(vs, 3 /* Invalid screen layout */);
}
break;
}
default:
VNC_DEBUG("Msg: %d\n", data[0]);
vnc_client_error(vs);
break;
}
vnc_update_throttle_offset(vs);
vnc_read_when(vs, protocol_client_msg, 1);
return 0;
}
static int protocol_client_init(VncState *vs, uint8_t *data, size_t len)
{
char buf[1024];
VncShareMode mode;
int size;
mode = data[0] ? VNC_SHARE_MODE_SHARED : VNC_SHARE_MODE_EXCLUSIVE;
switch (vs->vd->share_policy) {
case VNC_SHARE_POLICY_IGNORE:
/*
* Ignore the shared flag. Nothing to do here.
*
* Doesn't conform to the rfb spec but is traditional qemu
* behavior, thus left here as option for compatibility
* reasons.
*/
break;
case VNC_SHARE_POLICY_ALLOW_EXCLUSIVE:
/*
* Policy: Allow clients ask for exclusive access.
*
* Implementation: When a client asks for exclusive access,
* disconnect all others. Shared connects are allowed as long
* as no exclusive connection exists.
*
* This is how the rfb spec suggests to handle the shared flag.
*/
if (mode == VNC_SHARE_MODE_EXCLUSIVE) {
VncState *client;
QTAILQ_FOREACH(client, &vs->vd->clients, next) {
if (vs == client) {
continue;
}
if (client->share_mode != VNC_SHARE_MODE_EXCLUSIVE &&
client->share_mode != VNC_SHARE_MODE_SHARED) {
continue;
}
vnc_disconnect_start(client);
}
}
if (mode == VNC_SHARE_MODE_SHARED) {
if (vs->vd->num_exclusive > 0) {
vnc_disconnect_start(vs);
return 0;
}
}
break;
case VNC_SHARE_POLICY_FORCE_SHARED:
/*
* Policy: Shared connects only.
* Implementation: Disallow clients asking for exclusive access.
*
* Useful for shared desktop sessions where you don't want
* someone forgetting to say -shared when running the vnc
* client disconnect everybody else.
*/
if (mode == VNC_SHARE_MODE_EXCLUSIVE) {
vnc_disconnect_start(vs);
return 0;
}
break;
}
vnc_set_share_mode(vs, mode);
if (vs->vd->num_shared > vs->vd->connections_limit) {
vnc_disconnect_start(vs);
return 0;
}
assert(pixman_image_get_width(vs->vd->server) < 65536 &&
pixman_image_get_width(vs->vd->server) >= 0);
assert(pixman_image_get_height(vs->vd-