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0287d89f3e
xemu/ui/vnc.c
Li Qiang 6bf21f3d83 vnc: fix memory leak when vnc disconnect 
Currently when qemu receives a vnc connect, it creates a 'VncState' to
represent this connection. In 'vnc_worker_thread_loop' it creates a
local 'VncState'. The connection 'VcnState' and local 'VncState' exchange
data in 'vnc_async_encoding_start' and 'vnc_async_encoding_end'.
In 'zrle_compress_data' it calls 'deflateInit2' to allocate the libz library
opaque data. The 'VncState' used in 'zrle_compress_data' is the local
'VncState'. In 'vnc_zrle_clear' it calls 'deflateEnd' to free the libz
library opaque data. The 'VncState' used in 'vnc_zrle_clear' is the connection
'VncState'. In currently implementation there will be a memory leak when the
vnc disconnect. Following is the asan output backtrack:

Direct leak of 29760 byte(s) in 5 object(s) allocated from:
    0 0xffffa67ef3c3 in __interceptor_calloc (/lib64/libasan.so.4+0xd33c3)
    1 0xffffa65071cb in g_malloc0 (/lib64/libglib-2.0.so.0+0x571cb)
    2 0xffffa5e968f7 in deflateInit2_ (/lib64/libz.so.1+0x78f7)
    3 0xaaaacec58613 in zrle_compress_data ui/vnc-enc-zrle.c:87
    4 0xaaaacec58613 in zrle_send_framebuffer_update ui/vnc-enc-zrle.c:344
    5 0xaaaacec34e77 in vnc_send_framebuffer_update ui/vnc.c:919
    6 0xaaaacec5e023 in vnc_worker_thread_loop ui/vnc-jobs.c:271
    7 0xaaaacec5e5e7 in vnc_worker_thread ui/vnc-jobs.c:340
    8 0xaaaacee4d3c3 in qemu_thread_start util/qemu-thread-posix.c:502
    9 0xffffa544e8bb in start_thread (/lib64/libpthread.so.0+0x78bb)
    10 0xffffa53965cb in thread_start (/lib64/libc.so.6+0xd55cb)

This is because the opaque allocated in 'deflateInit2' is not freed in
'deflateEnd'. The reason is that the 'deflateEnd' calls 'deflateStateCheck'
and in the latter will check whether 's->strm != strm'(libz's data structure).
This check will be true so in 'deflateEnd' it just return 'Z_STREAM_ERROR' and
not free the data allocated in 'deflateInit2'.

The reason this happens is that the 'VncState' contains the whole 'VncZrle',
so when calling 'deflateInit2', the 's->strm' will be the local address.
So 's->strm != strm' will be true.

To fix this issue, we need to make 'zrle' of 'VncState' to be a pointer.
Then the connection 'VncState' and local 'VncState' exchange mechanism will
work as expection. The 'tight' of 'VncState' has the same issue, let's also turn
it to a pointer.

Reported-by: Ying Fang <fangying1@huawei.com>
Signed-off-by: Li Qiang <liq3ea@163.com>
Message-id: 20190831153922.121308-1-liq3ea@163.com
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
2019-09-17 13:45:10 +02:00

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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 "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/tlscredsanon.h"
#include "crypto/tlscredsx509.h"
#include "crypto/random.h"
#include "qom/object_interfaces.h"
#include "qemu/cutils.h"
#include "io/dns-resolver.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->has_auth = true;
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);
client->info->has_x509_dname =
client->info->x509_dname != NULL;
}
#ifdef CONFIG_VNC_SASL
if (client->sasl.conn &&
client->sasl.username) {
client->info->has_sasl_username = true;
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);
info->has_x509_dname = info->x509_dname != NULL;
}
#ifdef CONFIG_VNC_SASL
if (client->sasl.conn && client->sasl.username) {
info->has_sasl_username = true;
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 *cinfo, *prev = NULL;
VncState *client;
QTAILQ_FOREACH(client, &vd->clients, next) {
cinfo = g_new0(VncClientInfoList, 1);
cinfo->value = qmp_query_vnc_client(client);
cinfo->next = prev;
prev = cinfo;
}
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_host = true;
info->has_service = true;
info->has_family = true;
info->has_auth = 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)
{
VncServerInfo2List *list;
VncServerInfo2 *info;
Error *err = NULL;
SocketAddress *addr;
addr = qio_channel_socket_get_local_address(ioc, &err);
if (!addr) {
error_free(err);
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);
list = g_new0(VncServerInfo2List, 1);
list->value = info;
list->next = prev;
return list;
}
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 *item, *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", NULL));
info->has_display = true;
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);
}
item = g_new0(VncInfo2List, 1);
item->value = info;
item->next = prev;
prev = item;
}
return prev;
}
/* 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_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(VncState *vs)
{
if (vs->ioc == NULL || !vnc_has_feature(vs, VNC_FEATURE_RESIZE)) {
return;
}
if (vs->client_width == pixman_image_get_width(vs->vd->server) &&
vs->client_height == pixman_image_get_height(vs->vd->server)) {
return;
}
assert(pixman_image_get_width(vs->vd->server) < 65536 &&
pixman_image_get_width(vs->vd->server) >= 0);
assert(pixman_image_get_height(vs->vd->server) < 65536 &&
pixman_image_get_height(vs->vd->server) >= 0);
vs->client_width = pixman_image_get_width(vs->vd->server);
vs->client_height = pixman_image_get_height(vs->vd->server);
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->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)
{
static const char placeholder_msg[] =
"Display output is not active.";
static DisplaySurface *placeholder;
VncDisplay *vd = container_of(dcl, VncDisplay, dcl);
bool pageflip = vnc_check_pageflip(vd->ds, surface);
VncState *vs;
if (surface == NULL) {
if (placeholder == NULL) {
placeholder = qemu_create_message_surface(640, 480, placeholder_msg);
}
surface = placeholder;
}
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;
if (pageflip) {
vnc_set_area_dirty(vd->guest.dirty, vd, 0, 0,
surface_width(surface),
surface_height(surface));
return;
}
/* server surface */
vnc_update_server_surface(vd);
QTAILQ_FOREACH(vs, &vd->clients, next) {
vnc_colordepth(vs);
vnc_desktop_resize(vs);
if (vs->vd->cursor) {
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;
bool encode_raw = false;
size_t saved_offs = vs->output.offset;
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:
encode_raw = true;
break;
}
/* If the client has the same pixel format as our internal buffer and
* a RAW encoding would need less space fall back to RAW encoding to
* save bandwidth and processing power in the client. */
if (!encode_raw && vs->write_pixels == vnc_write_pixels_copy &&
12 + h * w * VNC_SERVER_FB_BYTES <= (vs->output.offset - saved_offs)) {
vs->output.offset = saved_offs;
encode_raw = true;
}
if (encode_raw) {
vnc_framebuffer_update(vs, x, y, w, h, VNC_ENCODING_RAW);
n = vnc_raw_send_framebuffer_update(vs, x, y, w, h);
}
return n;
}
static void vnc_mouse_set(DisplayChangeListener *dcl,
int x, int y, int visible)
{
/* can we ask the client(s) to move the pointer ??? */
}
static int vnc_cursor_define(VncState *vs)
{
QEMUCursor *c = vs->vd->cursor;
int isize;
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;
cursor_put(vd->cursor);
g_free(vd->cursor_mask);
vd->cursor = c;
cursor_get(vd->cursor);
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:
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:
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, void *buf, int size)
{
VncState *vs = opaque;
assert(vs->magic == VNC_MAGIC);
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);
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 **errp)
{
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,
errp ? error_get_pretty(*errp) :
"Unknown");
vnc_disconnect_start(vs);
}
if (errp) {
error_free(*errp);
*errp = NULL;
}
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, 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, 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 ret;
#ifdef CONFIG_VNC_SASL
if (vs->sasl.conn && vs->sasl.runSSF)
ret = vnc_client_read_sasl(vs);
else
#endif /* CONFIG_VNC_SASL */
ret = vnc_client_read_plain(vs);
if (!ret) {
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_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_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 client_cut_text(VncState *vs, size_t len, uint8_t *text)
{
}
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();
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 (vs->vd->dcl.con == NULL && down &&
qkbd_state_modifier_get(vs->vd->kbd, QKBD_MOD_CTRL) &&
qkbd_state_modifier_get(vs->vd->kbd, QKBD_MOD_ALT)) {
/* Reset the modifiers sent to the current console */
qkbd_state_lift_all_keys(vs->vd->kbd);
console_select(qcode - Q_KEY_CODE_1);
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_console_is_graphic(NULL)) {
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:
kbd_put_keysym(QEMU_KEY_UP);
break;
case 0xd0:
kbd_put_keysym(QEMU_KEY_DOWN);
break;
case 0xcb:
kbd_put_keysym(QEMU_KEY_LEFT);
break;
case 0xcd:
kbd_put_keysym(QEMU_KEY_RIGHT);
break;
case 0xd3:
kbd_put_keysym(QEMU_KEY_DELETE);
break;
case 0xc7:
kbd_put_keysym(QEMU_KEY_HOME);
break;
case 0xcf:
kbd_put_keysym(QEMU_KEY_END);
break;
case 0xc9:
kbd_put_keysym(QEMU_KEY_PAGEUP);
break;
case 0xd1:
kbd_put_keysym(QEMU_KEY_PAGEDOWN);
break;
case 0x47:
kbd_put_keysym(numlock ? '7' : QEMU_KEY_HOME);
break;
case 0x48:
kbd_put_keysym(numlock ? '8' : QEMU_KEY_UP);
break;
case 0x49:
kbd_put_keysym(numlock ? '9' : QEMU_KEY_PAGEUP);
break;
case 0x4b:
kbd_put_keysym(numlock ? '4' : QEMU_KEY_LEFT);
break;
case 0x4c:
kbd_put_keysym('5');
break;
case 0x4d:
kbd_put_keysym(numlock ? '6' : QEMU_KEY_RIGHT);
break;
case 0x4f:
kbd_put_keysym(numlock ? '1' : QEMU_KEY_END);
break;
case 0x50:
kbd_put_keysym(numlock ? '2' : QEMU_KEY_DOWN);
break;
case 0x51:
kbd_put_keysym(numlock ? '3' : QEMU_KEY_PAGEDOWN);
break;
case 0x52:
kbd_put_keysym('0');
break;
case 0x53:
kbd_put_keysym(numlock ? '.' : QEMU_KEY_DELETE);
break;
case 0xb5:
kbd_put_keysym('/');
break;
case 0x37:
kbd_put_keysym('*');
break;
case 0x4a:
kbd_put_keysym('-');
break;
case 0x4e:
kbd_put_keysym('+');
break;
case 0x9c:
kbd_put_keysym('\n');
break;
default:
if (control) {
kbd_put_keysym(sym & 0x1f);
} else {
kbd_put_keysym(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(NULL)) {
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);
}
}
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 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_COPYRECT:
vs->features |= VNC_FEATURE_COPYRECT_MASK;
break;
case VNC_ENCODING_HEXTILE:
vs->features |= VNC_FEATURE_HEXTILE_MASK;
vs->vnc_encoding = enc;
break;
case VNC_ENCODING_TIGHT:
vs->features |= VNC_FEATURE_TIGHT_MASK;
vs->vnc_encoding = enc;
break;
#ifdef CONFIG_VNC_PNG
case VNC_ENCODING_TIGHT_PNG:
vs->features |= VNC_FEATURE_TIGHT_PNG_MASK;
vs->vnc_encoding = enc;
break;
#endif
case VNC_ENCODING_ZLIB:
vs->features |= VNC_FEATURE_ZLIB_MASK;
vs->vnc_encoding = enc;
break;
case VNC_ENCODING_ZRLE:
vs->features |= VNC_FEATURE_ZRLE_MASK;
vs->vnc_encoding = enc;
break;
case VNC_ENCODING_ZYWRLE:
vs->features |= VNC_FEATURE_ZYWRLE_MASK;
vs->vnc_encoding = enc;
break;
case VNC_ENCODING_DESKTOPRESIZE:
vs->features |= VNC_FEATURE_RESIZE_MASK;
break;
case VNC_ENCODING_POINTER_TYPE_CHANGE:
vs->features |= VNC_FEATURE_POINTER_TYPE_CHANGE_MASK;
break;
case VNC_ENCODING_RICH_CURSOR:
vs->features |= VNC_FEATURE_RICH_CURSOR_MASK;
if (vs->vd->cursor) {
vnc_cursor_define(vs);
}
break;
case VNC_ENCODING_EXT_KEY_EVENT:
send_ext_key_event_ack(vs);
break;
case VNC_ENCODING_AUDIO:
send_ext_audio_ack(vs);
break;
case VNC_ENCODING_WMVi:
vs->features |= VNC_FEATURE_WMVI_MASK;
break;
case VNC_ENCODING_LED_STATE:
vs->features |= VNC_FEATURE_LED_STATE_MASK;
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);
}
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_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)));
}
}
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 */
#ifdef HOST_WORDS_BIGENDIAN
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,
pixman_image_get_width(vs->vd->server),
pixman_image_get_height(vs->vd->server),
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;
}
if (len == 8) {
uint32_t dlen = read_u32(data, 4);
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;
}
}
client_cut_text(vs, read_u32(data, 4), data + 8);
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 (len == 2)
return 4;
switch (read_u16 (data, 2)) {
case VNC_MSG_CLIENT_QEMU_AUDIO_ENABLE:
audio_add(vs);
break;
case VNC_MSG_CLIENT_QEMU_AUDIO_DISABLE:
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;
break;
default:
VNC_DEBUG("Invalid audio message %d\n", read_u8(data, 4));
vnc_client_error(vs);
break;
}
break;
default:
VNC_DEBUG("Msg: %d\n", read_u16(data, 0));
vnc_client_error(vs);
break;
}
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->server) < 65536 &&
pixman_image_get_height(vs->vd->server) >= 0);
vs->client_width = pixman_image_get_width(vs->vd->server);
vs->client_height = pixman_image_get_height(vs->vd->server);
vnc_write_u16(vs, vs->client_width);
vnc_write_u16(vs, vs->client_height);
pixel_format_message(vs);
if (qemu_name) {
size = snprintf(buf, sizeof(buf), "QEMU (%s)", qemu_name);
if (size > sizeof(buf)) {
size = sizeof(buf);
}
} else {
size = snprintf(buf, sizeof(buf), "QEMU");
}
vnc_write_u32(vs, size);
vnc_write(vs, buf, size);
vnc_flush(vs);
vnc_client_cache_auth(vs);
vnc_qmp_event(vs, QAPI_EVENT_VNC_INITIALIZED);
vnc_read_when(vs, protocol_client_msg, 1);
return 0;
}
void start_client_init(VncState *vs)
{
vnc_read_when(vs, protocol_client_init, 1);
}
static void authentication_failed(VncState *vs)
{
vnc_write_u32(vs, 1); /* Reject auth */
if (vs->minor >= 8) {
static const char err[] = "Authentication failed";
vnc_write_u32(vs, sizeof(err));
vnc_write(vs, err, sizeof(err));
}
vnc_flush(vs);
vnc_client_error(vs);
}
static int protocol_client_auth_vnc(VncState *vs, uint8_t *data, size_t len)
{
unsigned char response[VNC_AUTH_CHALLENGE_SIZE];
size_t i, pwlen;
unsigned char key[8];
time_t now = time(NULL);
QCryptoCipher *cipher = NULL;
Error *err = NULL;
if (!vs->vd->password) {
trace_vnc_auth_fail(vs, vs->auth, "password is not set", "");
goto reject;
}
if (vs->vd->expires < now) {
trace_vnc_auth_fail(vs, vs->auth, "password is expired", "");
goto reject;
}
memcpy(response, vs->challenge, VNC_AUTH_CHALLENGE_SIZE);
/* Calculate the expected challenge response */
pwlen = strlen(vs->vd->password);
for (i=0; i<sizeof(key); i++)
key[i] = i<pwlen ? vs->vd->password[i] : 0;
cipher = qcrypto_cipher_new(
QCRYPTO_CIPHER_ALG_DES_RFB,
QCRYPTO_CIPHER_MODE_ECB,
key, G_N_ELEMENTS(key),
&err);
if (!cipher) {
trace_vnc_auth_fail(vs, vs->auth, "cannot create cipher",
error_get_pretty(err));
error_free(err);
goto reject;
}
if (qcrypto_cipher_encrypt(cipher,
vs->challenge,
response,
VNC_AUTH_CHALLENGE_SIZE,
&err) < 0) {
trace_vnc_auth_fail(vs, vs->auth, "cannot encrypt challenge response",
error_get_pretty(err));
error_free(err);
goto reject;
}
/* Compare expected vs actual challenge response */
if (memcmp(response, data, VNC_AUTH_CHALLENGE_SIZE) != 0) {
trace_vnc_auth_fail(vs, vs->auth, "mis-matched challenge response", "");
goto reject;
} else {
trace_vnc_auth_pass(vs, vs->auth);
vnc_write_u32(vs, 0); /* Accept auth */
vnc_flush(vs);
start_client_init(vs);
}
qcrypto_cipher_free(cipher);
return 0;
reject:
authentication_failed(vs);
qcrypto_cipher_free(cipher);
return 0;
}
void start_auth_vnc(VncState *vs)
{
Error *err = NULL;
if (qcrypto_random_bytes(vs->challenge, sizeof(vs->challenge), &err)) {
trace_vnc_auth_fail(vs, vs->auth, "cannot get random bytes",
error_get_pretty(err));
error_free(err);
authentication_failed(vs);
return;
}
/* Send client a 'random' challenge */
vnc_write(vs, vs->challenge, sizeof(vs->challenge));
vnc_flush(vs);
vnc_read_when(vs, protocol_client_auth_vnc, sizeof(vs->challenge));
}
static int protocol_client_auth(VncState *vs, uint8_t *data, size_t len)
{
/* We only advertise 1 auth scheme at a time, so client
* must pick the one we sent. Verify this */
if (data[0] != vs->auth) { /* Reject auth */
trace_vnc_auth_reject(vs, vs->auth, (int)data[0]);
authentication_failed(vs);
} else { /* Accept requested auth */
trace_vnc_auth_start(vs, vs->auth);
switch (vs->auth) {
case VNC_AUTH_NONE:
if (vs->minor >= 8) {
vnc_write_u32(vs, 0); /* Accept auth completion */
vnc_flush(vs);
}
trace_vnc_auth_pass(vs, vs->auth);
start_client_init(vs);
break;
case VNC_AUTH_VNC:
start_auth_vnc(vs);
break;
case VNC_AUTH_VENCRYPT:
start_auth_vencrypt(vs);
break;
#ifdef CONFIG_VNC_SASL
case VNC_AUTH_SASL:
start_auth_sasl(vs);
break;
#endif /* CONFIG_VNC_SASL */
default: /* Should not be possible, but just in case */
trace_vnc_auth_fail(vs, vs->auth, "Unhandled auth method", "");
authentication_failed(vs);
}
}
return 0;
}
static int protocol_version(VncState *vs, uint8_t *version, size_t len)
{
char local[13];
memcpy(local, version, 12);
local[12] = 0;
if (sscanf(local, "RFB %03d.%03d\n", &vs->major, &vs->minor) != 2) {
VNC_DEBUG("Malformed protocol version %s\n", local);
vnc_client_error(vs);
return 0;
}
VNC_DEBUG("Client request protocol version %d.%d\n", vs->major, vs->minor);
if (vs->major != 3 ||
(vs->minor != 3 &&
vs->minor != 4 &&
vs->minor != 5 &&
vs->minor != 7 &&
vs->minor != 8)) {
VNC_DEBUG("Unsupported client version\n");
vnc_write_u32(vs, VNC_AUTH_INVALID);
vnc_flush(vs);
vnc_client_error(vs);
return 0;
}
/* Some broken clients report v3.4 or v3.5, which spec requires to be treated
* as equivalent to v3.3 by servers
*/
if (vs->minor == 4 || vs->minor == 5)
vs->minor = 3;
if (vs->minor == 3) {
trace_vnc_auth_start(vs, vs->auth);
if (vs->auth == VNC_AUTH_NONE) {
vnc_write_u32(vs, vs->auth);
vnc_flush(vs);
trace_vnc_auth_pass(vs, vs->auth);
start_client_init(vs);
} else if (vs->auth == VNC_AUTH_VNC) {
VNC_DEBUG("Tell client VNC auth\n");
vnc_write_u32(vs, vs->auth);
vnc_flush(vs);
start_auth_vnc(vs);
} else {
trace_vnc_auth_fail(vs, vs->auth,
"Unsupported auth method for v3.3", "");
vnc_write_u32(vs, VNC_AUTH_INVALID);
vnc_flush(vs);
vnc_client_error(vs);
}
} else {
vnc_write_u8(vs, 1); /* num auth */
vnc_write_u8(vs, vs->auth);
vnc_read_when(vs, protocol_client_auth, 1);
vnc_flush(vs);
}
return 0;
}
static VncRectStat *vnc_stat_rect(VncDisplay *vd, int x, int y)
{
struct VncSurface *vs = &vd->guest;
return &vs->stats[y / VNC_STAT_RECT][x / VNC_STAT_RECT];
}
void vnc_sent_lossy_rect(VncState *vs, int x, int y, int w, int h)
{
int i, j;
w = (x + w) / VNC_STAT_RECT;
h = (y + h) / VNC_STAT_RECT;
x /= VNC_STAT_RECT;
y /= VNC_STAT_RECT;
for (j = y; j <= h; j++) {
for (i = x; i <= w; i++) {
vs->lossy_rect[j][i] = 1;
}
}
}
static int vnc_refresh_lossy_rect(VncDisplay *vd, int x, int y)
{
VncState *vs;
int sty = y / VNC_STAT_RECT;
int stx = x / VNC_STAT_RECT;
int has_dirty = 0;
y = QEMU_ALIGN_DOWN(y, VNC_STAT_RECT);
x = QEMU_ALIGN_DOWN(x, VNC_STAT_RECT);
QTAILQ_FOREACH(vs, &vd->clients, next) {
int j;
/* kernel send buffers are full -> refresh later */
if (vs->output.offset) {
continue;
}
if (!vs->lossy_rect[sty][stx]) {
continue;
}
vs->lossy_rect[sty][stx] = 0;
for (j = 0; j < VNC_STAT_RECT; ++j) {
bitmap_set(vs->dirty[y + j],
x / VNC_DIRTY_PIXELS_PER_BIT,
VNC_STAT_RECT / VNC_DIRTY_PIXELS_PER_BIT);
}
has_dirty++;
}
return has_dirty;
}
static int vnc_update_stats(VncDisplay *vd, struct timeval * tv)
{
int width = MIN(pixman_image_get_width(vd->guest.fb),
pixman_image_get_width(vd->server));
int height = MIN(pixman_image_get_height(vd->guest.fb),
pixman_image_get_height(vd->server));
int x, y;
struct timeval res;
int has_dirty = 0;
for (y = 0; y < height; y += VNC_STAT_RECT) {
for (x = 0; x < width; x += VNC_STAT_RECT) {
VncRectStat *rect = vnc_stat_rect(vd, x, y);
rect->updated = false;
}
}
qemu_timersub(tv, &VNC_REFRESH_STATS, &res);
if (timercmp(&vd->guest.last_freq_check, &res, >)) {
return has_dirty;
}
vd->guest.last_freq_check = *tv;
for (y = 0; y < height; y += VNC_STAT_RECT) {
for (x = 0; x < width; x += VNC_STAT_RECT) {
VncRectStat *rect= vnc_stat_rect(vd, x, y);
int count = ARRAY_SIZE(rect->times);
struct timeval min, max;
if (!timerisset(&rect->times[count - 1])) {
continue ;
}
max = rect->times[(rect->idx + count - 1) % count];
qemu_timersub(tv, &max, &res);
if (timercmp(&res, &VNC_REFRESH_LOSSY, >)) {
rect->freq = 0;
has_dirty += vnc_refresh_lossy_rect(vd, x, y);
memset(rect->times, 0, sizeof (rect->times));
continue ;
}
min = rect->times[rect->idx];
max = rect->times[(rect->idx + count - 1) % count];
qemu_timersub(&max, &min, &res);
rect->freq = res.tv_sec + res.tv_usec / 1000000.;
rect->freq /= count;
rect->freq = 1. / rect->freq;
}
}
return has_dirty;
}
double vnc_update_freq(VncState *vs, int x, int y, int w, int h)
{
int i, j;
double total = 0;
int num = 0;
x = QEMU_ALIGN_DOWN(x, VNC_STAT_RECT);
y = QEMU_ALIGN_DOWN(y, VNC_STAT_RECT);
for (j = y; j <= y + h; j += VNC_STAT_RECT) {
for (i = x; i <= x + w; i += VNC_STAT_RECT) {
total += vnc_stat_rect(vs->vd, i, j)->freq;
num++;
}
}
if (num) {
return total / num;
} else {
return 0;
}
}
static void vnc_rect_updated(VncDisplay *vd, int x, int y, struct timeval * tv)
{
VncRectStat *rect;
rect = vnc_stat_rect(vd, x, y);
if (rect->updated) {
return ;
}
rect->times[rect->idx] = *tv;
rect->idx = (rect->idx + 1) % ARRAY_SIZE(rect->times);
rect->updated = true;
}
static int vnc_refresh_server_surface(VncDisplay *vd)
{
int width = MIN(pixman_image_get_width(vd->guest.fb),
pixman_image_get_width(vd->server));
int height = MIN(pixman_image_get_height(vd->guest.fb),
pixman_image_get_height(vd->server));
int cmp_bytes, server_stride, line_bytes, guest_ll, guest_stride, y = 0;
uint8_t *guest_row0 = NULL, *server_row0;
VncState *vs;
int has_dirty = 0;
pixman_image_t *tmpbuf = NULL;
struct timeval tv = { 0, 0 };
if (!vd->non_adaptive) {
gettimeofday(&tv, NULL);
has_dirty = vnc_update_stats(vd, &tv);
}
/*
* Walk through the guest dirty map.
* Check and copy modified bits from guest to server surface.
* Update server dirty map.
*/
server_row0 = (uint8_t *)pixman_image_get_data(vd->server);
server_stride = guest_stride = guest_ll =
pixman_image_get_stride(vd->server);
cmp_bytes = MIN(VNC_DIRTY_PIXELS_PER_BIT * VNC_SERVER_FB_BYTES,
server_stride);
if (vd->guest.format != VNC_SERVER_FB_FORMAT) {
int width = pixman_image_get_width(vd->server);
tmpbuf = qemu_pixman_linebuf_create(VNC_SERVER_FB_FORMAT, width);
} else {
int guest_bpp =
PIXMAN_FORMAT_BPP(pixman_image_get_format(vd->guest.fb));
guest_row0 = (uint8_t *)pixman_image_get_data(vd->guest.fb);
guest_stride = pixman_image_get_stride(vd->guest.fb);
guest_ll = pixman_image_get_width(vd->guest.fb)
* DIV_ROUND_UP(guest_bpp, 8);
}
line_bytes = MIN(server_stride, guest_ll);
for (;;) {
int x;
uint8_t *guest_ptr, *server_ptr;
unsigned long offset = find_next_bit((unsigned long *) &vd->guest.dirty,
height * VNC_DIRTY_BPL(&vd->guest),
y * VNC_DIRTY_BPL(&vd->guest));
if (offset == height * VNC_DIRTY_BPL(&vd->guest)) {
/* no more dirty bits */
break;
}
y = offset / VNC_DIRTY_BPL(&vd->guest);
x = offset % VNC_DIRTY_BPL(&vd->guest);
server_ptr = server_row0 + y * server_stride + x * cmp_bytes;
if (vd->guest.format != VNC_SERVER_FB_FORMAT) {
qemu_pixman_linebuf_fill(tmpbuf, vd->guest.fb, width, 0, y);
guest_ptr = (uint8_t *)pixman_image_get_data(tmpbuf);
} else {
guest_ptr = guest_row0 + y * guest_stride;
}
guest_ptr += x * cmp_bytes;
for (; x < DIV_ROUND_UP(width, VNC_DIRTY_PIXELS_PER_BIT);
x++, guest_ptr += cmp_bytes, server_ptr += cmp_bytes) {
int _cmp_bytes = cmp_bytes;
if (!test_and_clear_bit(x, vd->guest.dirty[y])) {
continue;
}
if ((x + 1) * cmp_bytes > line_bytes) {
_cmp_bytes = line_bytes - x * cmp_bytes;
}
assert(_cmp_bytes >= 0);
if (memcmp(server_ptr, guest_ptr, _cmp_bytes) == 0) {
continue;
}
memcpy(server_ptr, guest_ptr, _cmp_bytes);
if (!vd->non_adaptive) {
vnc_rect_updated(vd, x * VNC_DIRTY_PIXELS_PER_BIT,
y, &tv);
}
QTAILQ_FOREACH(vs, &vd->clients, next) {
set_bit(x, vs->dirty[y]);
}
has_dirty++;
}
y++;
}
qemu_pixman_image_unref(tmpbuf);
return has_dirty;
}
static void vnc_refresh(DisplayChangeListener *dcl)
{
VncDisplay *vd = container_of(dcl, VncDisplay, dcl);
VncState *vs, *vn;
int has_dirty, rects = 0;
if (QTAILQ_EMPTY(&vd->clients)) {
update_displaychangelistener(&vd->dcl, VNC_REFRESH_INTERVAL_MAX);
return;
}
graphic_hw_update(vd->dcl.con);
if (vnc_trylock_display(vd)) {
update_displaychangelistener(&vd->dcl, VNC_REFRESH_INTERVAL_BASE);
return;
}
has_dirty = vnc_refresh_server_surface(vd);
vnc_unlock_display(vd);
QTAILQ_FOREACH_SAFE(vs, &vd->clients, next, vn) {
rects += vnc_update_client(vs, has_dirty);
/* vs might be free()ed here */
}
if (has_dirty && rects) {
vd->dcl.update_interval /= 2;
if (vd->dcl.update_interval < VNC_REFRESH_INTERVAL_BASE) {
vd->dcl.update_interval = VNC_REFRESH_INTERVAL_BASE;
}
} else {
vd->dcl.update_interval += VNC_REFRESH_INTERVAL_INC;
if (vd->dcl.update_interval > VNC_REFRESH_INTERVAL_MAX) {
vd->dcl.update_interval = VNC_REFRESH_INTERVAL_MAX;
}
}
}
static void vnc_connect(VncDisplay *vd, QIOChannelSocket *sioc,
bool skipauth, bool websocket)
{
VncState *vs = g_new0(VncState, 1);
bool first_client = QTAILQ_EMPTY(&vd->clients);
int i;
trace_vnc_client_connect(vs, sioc);
vs->zrle = g_new0(VncZrle, 1);
vs->tight = g_new0(VncTight, 1);
vs->magic = VNC_MAGIC;
vs->sioc = sioc;
object_ref(OBJECT(vs->sioc));
vs->ioc = QIO_CHANNEL(sioc);
object_ref(OBJECT(vs->ioc));
vs->vd = vd;
buffer_init(&vs->input, "vnc-input/%p", sioc);
buffer_init(&vs->output, "vnc-output/%p", sioc);
buffer_init(&vs->jobs_buffer, "vnc-jobs_buffer/%p", sioc);
buffer_init(&vs->tight->tight, "vnc-tight/%p", sioc);
buffer_init(&vs->tight->zlib, "vnc-tight-zlib/%p", sioc);
buffer_init(&vs->tight->gradient, "vnc-tight-gradient/%p", sioc);
#ifdef CONFIG_VNC_JPEG
buffer_init(&vs->tight->jpeg, "vnc-tight-jpeg/%p", sioc);
#endif
#ifdef CONFIG_VNC_PNG
buffer_init(&vs->tight->png, "vnc-tight-png/%p", sioc);
#endif
buffer_init(&vs->zlib.zlib, "vnc-zlib/%p", sioc);
buffer_init(&vs->zrle->zrle, "vnc-zrle/%p", sioc);
buffer_init(&vs->zrle->fb, "vnc-zrle-fb/%p", sioc);
buffer_init(&vs->zrle->zlib, "vnc-zrle-zlib/%p", sioc);
if (skipauth) {
vs->auth = VNC_AUTH_NONE;
vs->subauth = VNC_AUTH_INVALID;
} else {
if (websocket) {
vs->auth = vd->ws_auth;
vs->subauth = VNC_AUTH_INVALID;
} else {
vs->auth = vd->auth;
vs->subauth = vd->subauth;
}
}
VNC_DEBUG("Client sioc=%p ws=%d auth=%d subauth=%d\n",
sioc, websocket, vs->auth, vs->subauth);
vs->lossy_rect = g_malloc0(VNC_STAT_ROWS * sizeof (*vs->lossy_rect));
for (i = 0; i < VNC_STAT_ROWS; ++i) {
vs->lossy_rect[i] = g_new0(uint8_t, VNC_STAT_COLS);
}
VNC_DEBUG("New client on socket %p\n", vs->sioc);
update_displaychangelistener(&vd->dcl, VNC_REFRESH_INTERVAL_BASE);
qio_channel_set_blocking(vs->ioc, false, NULL);
if (vs->ioc_tag) {
g_source_remove(vs->ioc_tag);
}
if (websocket) {
vs->websocket = 1;
if (vd->tlscreds) {
vs->ioc_tag = qio_channel_add_watch(
vs->ioc, G_IO_IN, vncws_tls_handshake_io, vs, NULL);
} else {
vs->ioc_tag = qio_channel_add_watch(
vs->ioc, G_IO_IN, vncws_handshake_io, vs, NULL);
}
} else {
vs->ioc_tag = qio_channel_add_watch(
vs->ioc, G_IO_IN, vnc_client_io, vs, NULL);
}
vnc_client_cache_addr(vs);
vnc_qmp_event(vs, QAPI_EVENT_VNC_CONNECTED);
vnc_set_share_mode(vs, VNC_SHARE_MODE_CONNECTING);
vs->last_x = -1;
vs->last_y = -1;
vs->as.freq = 44100;
vs->as.nchannels = 2;
vs->as.fmt = AUDIO_FORMAT_S16;
vs->as.endianness = 0;
qemu_mutex_init(&vs->output_mutex);
vs->bh = qemu_bh_new(vnc_jobs_bh, vs);
QTAILQ_INSERT_TAIL(&vd->clients, vs, next);
if (first_client) {
vnc_update_server_surface(vd);
}
graphic_hw_update(vd->dcl.con);
if (!vs->websocket) {
vnc_start_protocol(vs);
}
if (vd->num_connecting > vd->connections_limit) {
QTAILQ_FOREACH(vs, &vd->clients, next) {
if (vs->share_mode == VNC_SHARE_MODE_CONNECTING) {
vnc_disconnect_start(vs);
return;
}
}
}
}
void vnc_start_protocol(VncState *vs)
{
vnc_write(vs, "RFB 003.008\n", 12);
vnc_flush(vs);
vnc_read_when(vs, protocol_version, 12);
vs->mouse_mode_notifier.notify = check_pointer_type_change;
qemu_add_mouse_mode_change_notifier(&vs->mouse_mode_notifier);
}
static void vnc_listen_io(QIONetListener *listener,
QIOChannelSocket *cioc,
void *opaque)
{
VncDisplay *vd = opaque;
bool isWebsock = listener == vd->wslistener;
qio_channel_set_name(QIO_CHANNEL(cioc),
isWebsock ? "vnc-ws-server" : "vnc-server");
qio_channel_set_delay(QIO_CHANNEL(cioc), false);
vnc_connect(vd, cioc, false, isWebsock);
}
static const DisplayChangeListenerOps dcl_ops = {
.dpy_name = "vnc",
.dpy_refresh = vnc_refresh,
.dpy_gfx_update = vnc_dpy_update,
.dpy_gfx_switch = vnc_dpy_switch,
.dpy_gfx_check_format = qemu_pixman_check_format,
.dpy_mouse_set = vnc_mouse_set,
.dpy_cursor_define = vnc_dpy_cursor_define,
};
void vnc_display_init(const char *id, Error **errp)
{
VncDisplay *vd;
if (vnc_display_find(id) != NULL) {
return;
}
vd = g_malloc0(sizeof(*vd));
vd->id = strdup(id);
QTAILQ_INSERT_TAIL(&vnc_displays, vd, next);
QTAILQ_INIT(&vd->clients);
vd->expires = TIME_MAX;
if (keyboard_layout) {
trace_vnc_key_map_init(keyboard_layout);
vd->kbd_layout = init_keyboard_layout(name2keysym,
keyboard_layout, errp);
} else {
vd->kbd_layout = init_keyboard_layout(name2keysym, "en-us", errp);
}
if (!vd->kbd_layout) {
return;
}
vd->share_policy = VNC_SHARE_POLICY_ALLOW_EXCLUSIVE;
vd->connections_limit = 32;
qemu_mutex_init(&vd->mutex);
vnc_start_worker_thread();
vd->dcl.ops = &dcl_ops;
register_displaychangelistener(&vd->dcl);
vd->kbd = qkbd_state_init(vd->dcl.con);
}
static void vnc_display_close(VncDisplay *vd)
{
if (!vd) {
return;
}
vd->is_unix = false;
if (vd->listener) {
qio_net_listener_disconnect(vd->listener);
object_unref(OBJECT(vd->listener));
}
vd->listener = NULL;
if (vd->wslistener) {
qio_net_listener_disconnect(vd->wslistener);
object_unref(OBJECT(vd->wslistener));
}
vd->wslistener = NULL;
vd->auth = VNC_AUTH_INVALID;
vd->subauth = VNC_AUTH_INVALID;
if (vd->tlscreds) {
object_unparent(OBJECT(vd->tlscreds));
vd->tlscreds = NULL;
}
if (vd->tlsauthz) {
object_unparent(OBJECT(vd->tlsauthz));
vd->tlsauthz = NULL;
}
g_free(vd->tlsauthzid);
vd->tlsauthzid = NULL;
if (vd->lock_key_sync) {
qemu_remove_led_event_handler(vd->led);
vd->led = NULL;
}
#ifdef CONFIG_VNC_SASL
if (vd->sasl.authz) {
object_unparent(OBJECT(vd->sasl.authz));
vd->sasl.authz = NULL;
}
g_free(vd->sasl.authzid);
vd->sasl.authzid = NULL;
#endif
}
int vnc_display_password(const char *id, const char *password)
{
VncDisplay *vd = vnc_display_find(id);
if (!vd) {
return -EINVAL;
}
if (vd->auth == VNC_AUTH_NONE) {
error_printf_unless_qmp("If you want use passwords please enable "
"password auth using '-vnc ${dpy},password'.\n");
return -EINVAL;
}
g_free(vd->password);
vd->password = g_strdup(password);
return 0;
}
int vnc_display_pw_expire(const char *id, time_t expires)
{
VncDisplay *vd = vnc_display_find(id);
if (!vd) {
return -EINVAL;
}
vd->expires = expires;
return 0;
}
static void vnc_display_print_local_addr(VncDisplay *vd)
{
SocketAddress *addr;
Error *err = NULL;
if (!vd->listener || !vd->listener->nsioc) {
return;
}
addr = qio_channel_socket_get_local_address(vd->listener->sioc[0], &err);
if (!addr) {
return;
}
if (addr->type != SOCKET_ADDRESS_TYPE_INET) {
qapi_free_SocketAddress(addr);
return;
}
error_printf_unless_qmp("VNC server running on %s:%s\n",
addr->u.inet.host,
addr->u.inet.port);
qapi_free_SocketAddress(addr);
}
static QemuOptsList qemu_vnc_opts = {
.name = "vnc",
.head = QTAILQ_HEAD_INITIALIZER(qemu_vnc_opts.head),
.implied_opt_name = "vnc",
.desc = {
{
.name = "vnc",
.type = QEMU_OPT_STRING,
},{
.name = "websocket",
.type = QEMU_OPT_STRING,
},{
.name = "tls-creds",
.type = QEMU_OPT_STRING,
},{
.name = "share",
.type = QEMU_OPT_STRING,
},{
.name = "display",
.type = QEMU_OPT_STRING,
},{
.name = "head",
.type = QEMU_OPT_NUMBER,
},{
.name = "connections",
.type = QEMU_OPT_NUMBER,
},{
.name = "to",
.type = QEMU_OPT_NUMBER,
},{
.name = "ipv4",
.type = QEMU_OPT_BOOL,
},{
.name = "ipv6",
.type = QEMU_OPT_BOOL,
},{
.name = "password",
.type = QEMU_OPT_BOOL,
},{
.name = "reverse",
.type = QEMU_OPT_BOOL,
},{
.name = "lock-key-sync",
.type = QEMU_OPT_BOOL,
},{
.name = "key-delay-ms",
.type = QEMU_OPT_NUMBER,
},{
.name = "sasl",
.type = QEMU_OPT_BOOL,
},{
.name = "acl",
.type = QEMU_OPT_BOOL,
},{
.name = "tls-authz",
.type = QEMU_OPT_STRING,
},{
.name = "sasl-authz",
.type = QEMU_OPT_STRING,
},{
.name = "lossy",
.type = QEMU_OPT_BOOL,
},{
.name = "non-adaptive",
.type = QEMU_OPT_BOOL,
},{
.name = "audiodev",
.type = QEMU_OPT_STRING,
},
{ /* end of list */ }
},
};
static int
vnc_display_setup_auth(int *auth,
int *subauth,
QCryptoTLSCreds *tlscreds,
bool password,
bool sasl,
bool websocket,
Error **errp)
{
/*
* We have a choice of 3 authentication options
*
* 1. none
* 2. vnc
* 3. sasl
*
* The channel can be run in 2 modes
*
* 1. clear
* 2. tls
*
* And TLS can use 2 types of credentials
*
* 1. anon
* 2. x509
*
* We thus have 9 possible logical combinations
*
* 1. clear + none
* 2. clear + vnc
* 3. clear + sasl
* 4. tls + anon + none
* 5. tls + anon + vnc
* 6. tls + anon + sasl
* 7. tls + x509 + none
* 8. tls + x509 + vnc
* 9. tls + x509 + sasl
*
* These need to be mapped into the VNC auth schemes
* in an appropriate manner. In regular VNC, all the
* TLS options get mapped into VNC_AUTH_VENCRYPT
* sub-auth types.
*
* In websockets, the https:// protocol already provides
* TLS support, so there is no need to make use of the
* VeNCrypt extension. Furthermore, websockets browser
* clients could not use VeNCrypt even if they wanted to,
* as they cannot control when the TLS handshake takes
* place. Thus there is no option but to rely on https://,
* meaning combinations 4->6 and 7->9 will be mapped to
* VNC auth schemes in the same way as combos 1->3.
*
* Regardless of fact that we have a different mapping to
* VNC auth mechs for plain VNC vs websockets VNC, the end
* result has the same security characteristics.
*/
if (websocket || !tlscreds) {
if (password) {
VNC_DEBUG("Initializing VNC server with password auth\n");
*auth = VNC_AUTH_VNC;
} else if (sasl) {
VNC_DEBUG("Initializing VNC server with SASL auth\n");
*auth = VNC_AUTH_SASL;
} else {
VNC_DEBUG("Initializing VNC server with no auth\n");
*auth = VNC_AUTH_NONE;
}
*subauth = VNC_AUTH_INVALID;
} else {
bool is_x509 = object_dynamic_cast(OBJECT(tlscreds),
TYPE_QCRYPTO_TLS_CREDS_X509) != NULL;
bool is_anon = object_dynamic_cast(OBJECT(tlscreds),
TYPE_QCRYPTO_TLS_CREDS_ANON) != NULL;
if (!is_x509 && !is_anon) {
error_setg(errp,
"Unsupported TLS cred type %s",
object_get_typename(OBJECT(tlscreds)));
return -1;
}
*auth = VNC_AUTH_VENCRYPT;
if (password) {
if (is_x509) {
VNC_DEBUG("Initializing VNC server with x509 password auth\n");
*subauth = VNC_AUTH_VENCRYPT_X509VNC;
} else {
VNC_DEBUG("Initializing VNC server with TLS password auth\n");
*subauth = VNC_AUTH_VENCRYPT_TLSVNC;
}
} else if (sasl) {
if (is_x509) {
VNC_DEBUG("Initializing VNC server with x509 SASL auth\n");
*subauth = VNC_AUTH_VENCRYPT_X509SASL;
} else {
VNC_DEBUG("Initializing VNC server with TLS SASL auth\n");
*subauth = VNC_AUTH_VENCRYPT_TLSSASL;
}
} else {
if (is_x509) {
VNC_DEBUG("Initializing VNC server with x509 no auth\n");
*subauth = VNC_AUTH_VENCRYPT_X509NONE;
} else {
VNC_DEBUG("Initializing VNC server with TLS no auth\n");
*subauth = VNC_AUTH_VENCRYPT_TLSNONE;
}
}
}
return 0;
}
static int vnc_display_get_address(const char *addrstr,
bool websocket,
bool reverse,
int displaynum,
int to,
bool has_ipv4,
bool has_ipv6,
bool ipv4,
bool ipv6,
SocketAddress **retaddr,
Error **errp)
{
int ret = -1;
SocketAddress *addr = NULL;
addr = g_new0(SocketAddress, 1);
if (strncmp(addrstr, "unix:", 5) == 0) {
addr->type = SOCKET_ADDRESS_TYPE_UNIX;
addr->u.q_unix.path = g_strdup(addrstr + 5);
if (websocket) {
error_setg(errp, "UNIX sockets not supported with websock");
goto cleanup;
}
if (to) {
error_setg(errp, "Port range not support with UNIX socket");
goto cleanup;
}
ret = 0;
} else {
const char *port;
size_t hostlen;
unsigned long long baseport = 0;
InetSocketAddress *inet;
port = strrchr(addrstr, ':');
if (!port) {
if (websocket) {
hostlen = 0;
port = addrstr;
} else {
error_setg(errp, "no vnc port specified");
goto cleanup;
}
} else {
hostlen = port - addrstr;
port++;
if (*port == '\0') {
error_setg(errp, "vnc port cannot be empty");
goto cleanup;
}
}
addr->type = SOCKET_ADDRESS_TYPE_INET;
inet = &addr->u.inet;
if (addrstr[0] == '[' && addrstr[hostlen - 1] == ']') {
inet->host = g_strndup(addrstr + 1, hostlen - 2);
} else {
inet->host = g_strndup(addrstr, hostlen);
}
/* plain VNC port is just an offset, for websocket
* port is absolute */
if (websocket) {
if (g_str_equal(addrstr, "") ||
g_str_equal(addrstr, "on")) {
if (displaynum == -1) {
error_setg(errp, "explicit websocket port is required");
goto cleanup;
}
inet->port = g_strdup_printf(
"%d", displaynum + 5700);
if (to) {
inet->has_to = true;
inet->to = to + 5700;
}
} else {
inet->port = g_strdup(port);
}
} else {
int offset = reverse ? 0 : 5900;
if (parse_uint_full(port, &baseport, 10) < 0) {
error_setg(errp, "can't convert to a number: %s", port);
goto cleanup;
}
if (baseport > 65535 ||
baseport + offset > 65535) {
error_setg(errp, "port %s out of range", port);
goto cleanup;
}
inet->port = g_strdup_printf(
"%d", (int)baseport + offset);
if (to) {
inet->has_to = true;
inet->to = to + offset;
}
}
inet->ipv4 = ipv4;
inet->has_ipv4 = has_ipv4;
inet->ipv6 = ipv6;
inet->has_ipv6 = has_ipv6;
ret = baseport;
}
*retaddr = addr;
cleanup:
if (ret < 0) {
qapi_free_SocketAddress(addr);
}
return ret;
}
static void vnc_free_addresses(SocketAddress ***retsaddr,
size_t *retnsaddr)
{
size_t i;
for (i = 0; i < *retnsaddr; i++) {
qapi_free_SocketAddress((*retsaddr)[i]);
}
g_free(*retsaddr);
*retsaddr = NULL;
*retnsaddr = 0;
}
static int vnc_display_get_addresses(QemuOpts *opts,
bool reverse,
SocketAddress ***retsaddr,
size_t *retnsaddr,
SocketAddress ***retwsaddr,
size_t *retnwsaddr,
Error **errp)
{
SocketAddress *saddr = NULL;
SocketAddress *wsaddr = NULL;
QemuOptsIter addriter;
const char *addr;
int to = qemu_opt_get_number(opts, "to", 0);
bool has_ipv4 = qemu_opt_get(opts, "ipv4");
bool has_ipv6 = qemu_opt_get(opts, "ipv6");
bool ipv4 = qemu_opt_get_bool(opts, "ipv4", false);
bool ipv6 = qemu_opt_get_bool(opts, "ipv6", false);
int displaynum = -1;
int ret = -1;
*retsaddr = NULL;
*retnsaddr = 0;
*retwsaddr = NULL;
*retnwsaddr = 0;
addr = qemu_opt_get(opts, "vnc");
if (addr == NULL || g_str_equal(addr, "none")) {
ret = 0;
goto cleanup;
}
if (qemu_opt_get(opts, "websocket") &&
!qcrypto_hash_supports(QCRYPTO_HASH_ALG_SHA1)) {
error_setg(errp,
"SHA1 hash support is required for websockets");
goto cleanup;
}
qemu_opt_iter_init(&addriter, opts, "vnc");
while ((addr = qemu_opt_iter_next(&addriter)) != NULL) {
int rv;
rv = vnc_display_get_address(addr, false, reverse, 0, to,
has_ipv4, has_ipv6,
ipv4, ipv6,
&saddr, errp);
if (rv < 0) {
goto cleanup;
}
/* Historical compat - first listen address can be used
* to set the default websocket port
*/
if (displaynum == -1) {
displaynum = rv;
}
*retsaddr = g_renew(SocketAddress *, *retsaddr, *retnsaddr + 1);
(*retsaddr)[(*retnsaddr)++] = saddr;
}
/* If we had multiple primary displays, we don't do defaults
* for websocket, and require explicit config instead. */
if (*retnsaddr > 1) {
displaynum = -1;
}
qemu_opt_iter_init(&addriter, opts, "websocket");
while ((addr = qemu_opt_iter_next(&addriter)) != NULL) {
if (vnc_display_get_address(addr, true, reverse, displaynum, to,
has_ipv4, has_ipv6,
ipv4, ipv6,
&wsaddr, errp) < 0) {
goto cleanup;
}
/* Historical compat - if only a single listen address was
* provided, then this is used to set the default listen
* address for websocket too
*/
if (*retnsaddr == 1 &&
(*retsaddr)[0]->type == SOCKET_ADDRESS_TYPE_INET &&
wsaddr->type == SOCKET_ADDRESS_TYPE_INET &&
g_str_equal(wsaddr->u.inet.host, "") &&
!g_str_equal((*retsaddr)[0]->u.inet.host, "")) {
g_free(wsaddr->u.inet.host);
wsaddr->u.inet.host = g_strdup((*retsaddr)[0]->u.inet.host);
}
*retwsaddr = g_renew(SocketAddress *, *retwsaddr, *retnwsaddr + 1);
(*retwsaddr)[(*retnwsaddr)++] = wsaddr;
}
ret = 0;
cleanup:
if (ret < 0) {
vnc_free_addresses(retsaddr, retnsaddr);
vnc_free_addresses(retwsaddr, retnwsaddr);
}
return ret;
}
static int vnc_display_connect(VncDisplay *vd,
SocketAddress **saddr,
size_t nsaddr,
SocketAddress **wsaddr,
size_t nwsaddr,
Error **errp)
{
/* connect to viewer */
QIOChannelSocket *sioc = NULL;
if (nwsaddr != 0) {
error_setg(errp, "Cannot use websockets in reverse mode");
return -1;
}
if (nsaddr != 1) {
error_setg(errp, "Expected a single address in reverse mode");
return -1;
}
/* TODO SOCKET_ADDRESS_TYPE_FD when fd has AF_UNIX */
vd->is_unix = saddr[0]->type == SOCKET_ADDRESS_TYPE_UNIX;
sioc = qio_channel_socket_new();
qio_channel_set_name(QIO_CHANNEL(sioc), "vnc-reverse");
if (qio_channel_socket_connect_sync(sioc, saddr[0], errp) < 0) {
return -1;
}
vnc_connect(vd, sioc, false, false);
object_unref(OBJECT(sioc));
return 0;
}
static int vnc_display_listen(VncDisplay *vd,
SocketAddress **saddr,
size_t nsaddr,
SocketAddress **wsaddr,
size_t nwsaddr,
Error **errp)
{
size_t i;
if (nsaddr) {
vd->listener = qio_net_listener_new();
qio_net_listener_set_name(vd->listener, "vnc-listen");
for (i = 0; i < nsaddr; i++) {
if (qio_net_listener_open_sync(vd->listener,
saddr[i], 1,
errp) < 0) {
return -1;
}
}
qio_net_listener_set_client_func(vd->listener,
vnc_listen_io, vd, NULL);
}
if (nwsaddr) {
vd->wslistener = qio_net_listener_new();
qio_net_listener_set_name(vd->wslistener, "vnc-ws-listen");
for (i = 0; i < nwsaddr; i++) {
if (qio_net_listener_open_sync(vd->wslistener,
wsaddr[i], 1,
errp) < 0) {
return -1;
}
}
qio_net_listener_set_client_func(vd->wslistener,
vnc_listen_io, vd, NULL);
}
return 0;
}
void vnc_display_open(const char *id, Error **errp)
{
VncDisplay *vd = vnc_display_find(id);
QemuOpts *opts = qemu_opts_find(&qemu_vnc_opts, id);
SocketAddress **saddr = NULL, **wsaddr = NULL;
size_t nsaddr, nwsaddr;
const char *share, *device_id;
QemuConsole *con;
bool password = false;
bool reverse = false;
const char *credid;
bool sasl = false;
int acl = 0;
const char *tlsauthz;
const char *saslauthz;
int lock_key_sync = 1;
int key_delay_ms;
const char *audiodev;
if (!vd) {
error_setg(errp, "VNC display not active");
return;
}
vnc_display_close(vd);
if (!opts) {
return;
}
reverse = qemu_opt_get_bool(opts, "reverse", false);
if (vnc_display_get_addresses(opts, reverse, &saddr, &nsaddr,
&wsaddr, &nwsaddr, errp) < 0) {
goto fail;
}
password = qemu_opt_get_bool(opts, "password", false);
if (password) {
if (fips_get_state()) {
error_setg(errp,
"VNC password auth disabled due to FIPS mode, "
"consider using the VeNCrypt or SASL authentication "
"methods as an alternative");
goto fail;
}
if (!qcrypto_cipher_supports(
QCRYPTO_CIPHER_ALG_DES_RFB, QCRYPTO_CIPHER_MODE_ECB)) {
error_setg(errp,
"Cipher backend does not support DES RFB algorithm");
goto fail;
}
}
lock_key_sync = qemu_opt_get_bool(opts, "lock-key-sync", true);
key_delay_ms = qemu_opt_get_number(opts, "key-delay-ms", 10);
sasl = qemu_opt_get_bool(opts, "sasl", false);
#ifndef CONFIG_VNC_SASL
if (sasl) {
error_setg(errp, "VNC SASL auth requires cyrus-sasl support");
goto fail;
}
#endif /* CONFIG_VNC_SASL */
credid = qemu_opt_get(opts, "tls-creds");
if (credid) {
Object *creds;
creds = object_resolve_path_component(
object_get_objects_root(), credid);
if (!creds) {
error_setg(errp, "No TLS credentials with id '%s'",
credid);
goto fail;
}
vd->tlscreds = (QCryptoTLSCreds *)
object_dynamic_cast(creds,
TYPE_QCRYPTO_TLS_CREDS);
if (!vd->tlscreds) {
error_setg(errp, "Object with id '%s' is not TLS credentials",
credid);
goto fail;
}
object_ref(OBJECT(vd->tlscreds));
if (vd->tlscreds->endpoint != QCRYPTO_TLS_CREDS_ENDPOINT_SERVER) {
error_setg(errp,
"Expecting TLS credentials with a server endpoint");
goto fail;
}
}
if (qemu_opt_get(opts, "acl")) {
error_report("The 'acl' option to -vnc is deprecated. "
"Please use the 'tls-authz' and 'sasl-authz' "
"options instead");
}
acl = qemu_opt_get_bool(opts, "acl", false);
tlsauthz = qemu_opt_get(opts, "tls-authz");
if (acl && tlsauthz) {
error_setg(errp, "'acl' option is mutually exclusive with the "
"'tls-authz' option");
goto fail;
}
if (tlsauthz && !vd->tlscreds) {
error_setg(errp, "'tls-authz' provided but TLS is not enabled");
goto fail;
}
saslauthz = qemu_opt_get(opts, "sasl-authz");
if (acl && saslauthz) {
error_setg(errp, "'acl' option is mutually exclusive with the "
"'sasl-authz' option");
goto fail;
}
if (saslauthz && !sasl) {
error_setg(errp, "'sasl-authz' provided but SASL auth is not enabled");
goto fail;
}
share = qemu_opt_get(opts, "share");
if (share) {
if (strcmp(share, "ignore") == 0) {
vd->share_policy = VNC_SHARE_POLICY_IGNORE;
} else if (strcmp(share, "allow-exclusive") == 0) {
vd->share_policy = VNC_SHARE_POLICY_ALLOW_EXCLUSIVE;
} else if (strcmp(share, "force-shared") == 0) {
vd->share_policy = VNC_SHARE_POLICY_FORCE_SHARED;
} else {
error_setg(errp, "unknown vnc share= option");
goto fail;
}
} else {
vd->share_policy = VNC_SHARE_POLICY_ALLOW_EXCLUSIVE;
}
vd->connections_limit = qemu_opt_get_number(opts, "connections", 32);
#ifdef CONFIG_VNC_JPEG
vd->lossy = qemu_opt_get_bool(opts, "lossy", false);
#endif
vd->non_adaptive = qemu_opt_get_bool(opts, "non-adaptive", false);
/* adaptive updates are only used with tight encoding and
* if lossy updates are enabled so we can disable all the
* calculations otherwise */
if (!vd->lossy) {
vd->non_adaptive = true;
}
if (tlsauthz) {
vd->tlsauthzid = g_strdup(tlsauthz);
} else if (acl) {
if (strcmp(vd->id, "default") == 0) {
vd->tlsauthzid = g_strdup("vnc.x509dname");
} else {
vd->tlsauthzid = g_strdup_printf("vnc.%s.x509dname", vd->id);
}
vd->tlsauthz = QAUTHZ(qauthz_list_new(vd->tlsauthzid,
QAUTHZ_LIST_POLICY_DENY,
&error_abort));
}
#ifdef CONFIG_VNC_SASL
if (sasl) {
if (saslauthz) {
vd->sasl.authzid = g_strdup(saslauthz);
} else if (acl) {
if (strcmp(vd->id, "default") == 0) {
vd->sasl.authzid = g_strdup("vnc.username");
} else {
vd->sasl.authzid = g_strdup_printf("vnc.%s.username", vd->id);
}
vd->sasl.authz = QAUTHZ(qauthz_list_new(vd->sasl.authzid,
QAUTHZ_LIST_POLICY_DENY,
&error_abort));
}
}
#endif
if (vnc_display_setup_auth(&vd->auth, &vd->subauth,
vd->tlscreds, password,
sasl, false, errp) < 0) {
goto fail;
}
trace_vnc_auth_init(vd, 0, vd->auth, vd->subauth);
if (vnc_display_setup_auth(&vd->ws_auth, &vd->ws_subauth,
vd->tlscreds, password,
sasl, true, errp) < 0) {
goto fail;
}
trace_vnc_auth_init(vd, 1, vd->ws_auth, vd->ws_subauth);
#ifdef CONFIG_VNC_SASL
if (sasl) {
int saslErr = sasl_server_init(NULL, "qemu");
if (saslErr != SASL_OK) {
error_setg(errp, "Failed to initialize SASL auth: %s",
sasl_errstring(saslErr, NULL, NULL));
goto fail;
}
}
#endif
vd->lock_key_sync = lock_key_sync;
if (lock_key_sync) {
vd->led = qemu_add_led_event_handler(kbd_leds, vd);
}
vd->ledstate = 0;
audiodev = qemu_opt_get(opts, "audiodev");
if (audiodev) {
vd->audio_state = audio_state_by_name(audiodev);
if (!vd->audio_state) {
error_setg(errp, "Audiodev '%s' not found", audiodev);
goto fail;
}
}
device_id = qemu_opt_get(opts, "display");
if (device_id) {
int head = qemu_opt_get_number(opts, "head", 0);
Error *err = NULL;
con = qemu_console_lookup_by_device_name(device_id, head, &err);
if (err) {
error_propagate(errp, err);
goto fail;
}
} else {
con = NULL;
}
if (con != vd->dcl.con) {
qkbd_state_free(vd->kbd);
unregister_displaychangelistener(&vd->dcl);
vd->dcl.con = con;
register_displaychangelistener(&vd->dcl);
vd->kbd = qkbd_state_init(vd->dcl.con);
}
qkbd_state_set_delay(vd->kbd, key_delay_ms);
if (saddr == NULL) {
goto cleanup;
}
if (reverse) {
if (vnc_display_connect(vd, saddr, nsaddr, wsaddr, nwsaddr, errp) < 0) {
goto fail;
}
} else {
if (vnc_display_listen(vd, saddr, nsaddr, wsaddr, nwsaddr, errp) < 0) {
goto fail;
}
}
if (qemu_opt_get(opts, "to")) {
vnc_display_print_local_addr(vd);
}
cleanup:
vnc_free_addresses(&saddr, &nsaddr);
vnc_free_addresses(&wsaddr, &nwsaddr);
return;
fail:
vnc_display_close(vd);
goto cleanup;
}
void vnc_display_add_client(const char *id, int csock, bool skipauth)
{
VncDisplay *vd = vnc_display_find(id);
QIOChannelSocket *sioc;
if (!vd) {
return;
}
sioc = qio_channel_socket_new_fd(csock, NULL);
if (sioc) {
qio_channel_set_name(QIO_CHANNEL(sioc), "vnc-server");
vnc_connect(vd, sioc, skipauth, false);
object_unref(OBJECT(sioc));
}
}
static void vnc_auto_assign_id(QemuOptsList *olist, QemuOpts *opts)
{
int i = 2;
char *id;
id = g_strdup("default");
while (qemu_opts_find(olist, id)) {
g_free(id);
id = g_strdup_printf("vnc%d", i++);
}
qemu_opts_set_id(opts, id);
}
QemuOpts *vnc_parse(const char *str, Error **errp)
{
QemuOptsList *olist = qemu_find_opts("vnc");
QemuOpts *opts = qemu_opts_parse(olist, str, true, errp);
const char *id;
if (!opts) {
return NULL;
}
id = qemu_opts_id(opts);
if (!id) {
/* auto-assign id if not present */
vnc_auto_assign_id(olist, opts);
}
return opts;
}
int vnc_init_func(void *opaque, QemuOpts *opts, Error **errp)
{
Error *local_err = NULL;
char *id = (char *)qemu_opts_id(opts);
assert(id);
vnc_display_init(id, &local_err);
if (local_err) {
error_propagate(errp, local_err);
return -1;
}
vnc_display_open(id, &local_err);
if (local_err != NULL) {
error_propagate(errp, local_err);
return -1;
}
return 0;
}
static void vnc_register_config(void)
{
qemu_add_opts(&qemu_vnc_opts);
}
opts_init(vnc_register_config);
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