vnc: added initial websocket protocol support

This patch adds basic Websocket Protocol version 13 - RFC 6455 - support
to QEMU VNC. Binary encoding support on the client side is mandatory.

Because of the GnuTLS requirement the Websockets implementation is
optional (--enable-vnc-ws).

To activate Websocket support the VNC option "websocket"is used, for
example "-vnc :0,websocket".
The listen port for Websocket connections is (5700 + display) so if
QEMU VNC is started with :0 the Websocket port would be 5700.
As an alternative the Websocket port could be manually specified by
using ",websocket=<port>" instead.

Parts of the implementation base on Anthony Liguori's QEMU Websocket
patch from 2010 and on Joel Martin's LibVNC Websocket implementation.

Signed-off-by: Tim Hardeck <thardeck@suse.de>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>

1 files changed, 19 insertions, 0 deletions

diff --git a/ui/vnc.h b/ui/vnc.h
index 5059cbe..f93c89a 100644
--- a/ui/vnc.h
+++ b/ui/vnc.h
@@ -99,6 +99,9 @@ typedef struct VncDisplay VncDisplay;
 #ifdef CONFIG_VNC_SASL
 #include "vnc-auth-sasl.h"
 #endif
+#ifdef CONFIG_VNC_WS
+#include "vnc-ws.h"
+#endif
 
 struct VncRectStat
 {
@@ -142,6 +145,11 @@ struct VncDisplay
     QEMUTimer *timer;
     int timer_interval;
     int lsock;
+#ifdef CONFIG_VNC_WS
+    int lwebsock;
+    bool websocket;
+    char *ws_display;
+#endif
     DisplayState *ds;
     kbd_layout_t *kbd_layout;
     int lock_key_sync;
@@ -269,11 +277,19 @@ struct VncState
 #ifdef CONFIG_VNC_SASL
     VncStateSASL sasl;
 #endif
+#ifdef CONFIG_VNC_WS
+    bool encode_ws;
+    bool websocket;
+#endif
 
     QObject *info;
 
     Buffer output;
     Buffer input;
+#ifdef CONFIG_VNC_WS
+    Buffer ws_input;
+    Buffer ws_output;
+#endif
     /* current output mode information */
     VncWritePixels *write_pixels;
     PixelFormat client_pf;
@@ -493,6 +509,8 @@ void vnc_write_u16(VncState *vs, uint16_t value);
 void vnc_write_u8(VncState *vs, uint8_t value);
 void vnc_flush(VncState *vs);
 void vnc_read_when(VncState *vs, VncReadEvent *func, size_t expecting);
+void vnc_disconnect_finish(VncState *vs);
+void vnc_init_state(VncState *vs);
 
 
 /* Buffer I/O functions */
@@ -511,6 +529,7 @@ void buffer_reset(Buffer *buffer);
 void buffer_free(Buffer *buffer);
 void buffer_append(Buffer *buffer, const void *data, size_t len);
 void buffer_advance(Buffer *buf, size_t len);
+uint8_t *buffer_end(Buffer *buffer);
 
 
 /* Misc helpers */