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authorGerd Hoffmann <kraxel@redhat.com>2011-11-24 18:10:49 +0100
committerGerd Hoffmann <kraxel@redhat.com>2012-02-10 09:58:33 +0100
commit8cf364898cfe4ae761f2253e91a040633d6f87be (patch)
tree056bc466b445d527bda61b0021c63bf3d152f4b8 /ui/vnc.c
parente26437c2d4a7f6cbbc0bbd51b08a2dcce84bb93b (diff)
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vnc: implement shared flag handling.
VNC clients send a shared flag in the client init message. Up to now qemu completely ignores this. This patch implements shared flag handling. It comes with three policies: By default qemu behaves as one would expect: Asking for a exclusive access grants exclusive access to the client connecting. There is also a desktop sharing mode which disallows exclusive connects (so one forgetting -shared wouldn't drop everybody else) and a compatibility mode which mimics the traditional (but non-conforming) qemu behavior. Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Diffstat (limited to 'ui/vnc.c')
-rw-r--r--ui/vnc.c98
1 files changed, 98 insertions, 0 deletions
diff --git a/ui/vnc.c b/ui/vnc.c
index 810582b..83a9b15 100644
--- a/ui/vnc.c
+++ b/ui/vnc.c
@@ -47,6 +47,29 @@ static DisplayChangeListener *dcl;
static int vnc_cursor_define(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/%d: %s -> %s\n", __func__,
+ vs->csock, mn[vs->share_mode], mn[mode]);
+#endif
+
+ if (vs->share_mode == VNC_SHARE_MODE_EXCLUSIVE) {
+ vs->vd->num_exclusive--;
+ }
+ vs->share_mode = mode;
+ if (vs->share_mode == VNC_SHARE_MODE_EXCLUSIVE) {
+ vs->vd->num_exclusive++;
+ }
+}
+
static char *addr_to_string(const char *format,
struct sockaddr_storage *sa,
socklen_t salen) {
@@ -997,6 +1020,7 @@ static void vnc_disconnect_start(VncState *vs)
{
if (vs->csock == -1)
return;
+ vnc_set_share_mode(vs, VNC_SHARE_MODE_DISCONNECTED);
qemu_set_fd_handler2(vs->csock, NULL, NULL, NULL, NULL);
closesocket(vs->csock);
vs->csock = -1;
@@ -2054,8 +2078,67 @@ static int protocol_client_msg(VncState *vs, uint8_t *data, size_t len)
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);
+
vs->client_width = ds_get_width(vs->ds);
vs->client_height = ds_get_height(vs->ds);
vnc_write_u16(vs, vs->client_width);
@@ -2562,6 +2645,7 @@ static void vnc_connect(VncDisplay *vd, int csock, int skipauth)
vnc_client_cache_addr(vs);
vnc_qmp_event(vs, QEVENT_VNC_CONNECTED);
+ vnc_set_share_mode(vs, VNC_SHARE_MODE_CONNECTING);
vs->vd = vd;
vs->ds = vd->ds;
@@ -2755,6 +2839,7 @@ int vnc_display_open(DisplayState *ds, const char *display)
if (!(vs->display = strdup(display)))
return -1;
+ vs->share_policy = VNC_SHARE_POLICY_ALLOW_EXCLUSIVE;
options = display;
while ((options = strchr(options, ','))) {
@@ -2810,6 +2895,19 @@ int vnc_display_open(DisplayState *ds, const char *display)
vs->lossy = true;
} else if (strncmp(options, "non-adapative", 13) == 0) {
vs->non_adaptive = true;
+ } else if (strncmp(options, "share=", 6) == 0) {
+ if (strncmp(options+6, "ignore", 6) == 0) {
+ vs->share_policy = VNC_SHARE_POLICY_IGNORE;
+ } else if (strncmp(options+6, "allow-exclusive", 15) == 0) {
+ vs->share_policy = VNC_SHARE_POLICY_ALLOW_EXCLUSIVE;
+ } else if (strncmp(options+6, "force-shared", 12) == 0) {
+ vs->share_policy = VNC_SHARE_POLICY_FORCE_SHARED;
+ } else {
+ fprintf(stderr, "unknown vnc share= option\n");
+ g_free(vs->display);
+ vs->display = NULL;
+ return -1;
+ }
}
}