QMP: Introduce VNC_CONNECTED event

It's emitted when a VNC client connects to QEMU, client's information
such as port and IP address are provided.

Note that this event is emitted right when the connection is
established. This means that it happens before authentication
procedure and session initialization.

Event example:

{ "event": "VNC_CONNECTED",
    "timestamp": { "seconds": 1262976601, "microseconds": 975795 },
    "data": {
        "server": { "auth": "sasl", "family": "ipv4",
                    "service": "5901", "host": "0.0.0.0" },
        "client": { "family": "ipv4", "service": "58425",
                    "host": "127.0.0.1" } } }

Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>

4 files changed, 36 insertions, 0 deletions

diff --git a/QMP/qmp-events.txt b/QMP/qmp-events.txt
index 682a5e53ac..d36da468ad 100644
--- a/QMP/qmp-events.txt
+++ b/QMP/qmp-events.txt
@@ -24,3 +24,10 @@ Data: None.
 
 Description: Issued when the Virtual Machine enters debug mode.
 Data: None.
+
+4 VNC_CONNECTED
+---------------
+
+Description: Issued when a VNC client establishes a connection.
+Data: 'server' and 'client' keys with the same keys as 'query-vnc',
+except that authentication ID is not provided.
diff --git a/monitor.c b/monitor.c
index b824e7c7cd..c92668045a 100644
--- a/monitor.c
+++ b/monitor.c
@@ -357,6 +357,9 @@ void monitor_protocol_event(MonitorEvent event, QObject *data)
         case QEVENT_STOP:
             event_name = "STOP";
             break;
+        case QEVENT_VNC_CONNECTED:
+            event_name = "VNC_CONNECTED";
+            break;
         default:
             abort();
             break;
diff --git a/monitor.h b/monitor.h
index 6ed117a920..4d57679000 100644
--- a/monitor.h
+++ b/monitor.h
@@ -20,6 +20,7 @@ typedef enum MonitorEvent {
     QEVENT_RESET,
     QEVENT_POWERDOWN,
     QEVENT_STOP,
+    QEVENT_VNC_CONNECTED,
     QEVENT_MAX,
 } MonitorEvent;
 
diff --git a/vnc.c b/vnc.c
index d37fa6021f..6d488e52ce 100644
--- a/vnc.c
+++ b/vnc.c
@@ -269,6 +269,30 @@ static void vnc_client_cache_addr(VncState *client)
     client->info = QOBJECT(qdict);
 }
 
+static void vnc_qmp_event(VncState *vs, MonitorEvent event)
+{
+    QDict *server;
+    QObject *data;
+
+    if (!vs->info) {
+        return;
+    }
+
+    server = qdict_new();
+    if (vnc_server_info_put(server) < 0) {
+        QDECREF(server);
+        return;
+    }
+
+    data = qobject_from_jsonf("{ 'client': %p, 'server': %p }",
+                              vs->info, QOBJECT(server));
+
+    monitor_protocol_event(event, data);
+
+    qobject_incref(vs->info);
+    qobject_decref(data);
+}
+
 static void info_vnc_iter(QObject *obj, void *opaque)
 {
     QDict *client;
@@ -2396,6 +2420,7 @@ static void vnc_connect(VncDisplay *vd, int csock)
     qemu_set_fd_handler2(vs->csock, NULL, vnc_client_read, NULL, vs);
 
     vnc_client_cache_addr(vs);
+    vnc_qmp_event(vs, QEVENT_VNC_CONNECTED);
 
     vs->vd = vd;
     vs->ds = vd->ds;