libvnc[server|client]: implement xvp VNC extension.

This implements the xvp VNC extension, which is described in the
community version of the RFB protocol:
http://tigervnc.sourceforge.net/cgi-bin/rfbproto
It is also mentioned in the official RFB protocol.

1 files changed, 52 insertions, 0 deletions

diff --git a/libvncclient/rfbproto.c b/libvncclient/rfbproto.c
index 098ae38..7d881c4 100644
--- a/libvncclient/rfbproto.c
+++ b/libvncclient/rfbproto.c
@@ -1230,6 +1230,9 @@ SetFormatAndEncodings(rfbClient* client)
   if (se->nEncodings < MAX_ENCODINGS)
     encs[se->nEncodings++] = rfbClientSwap32IfLE(rfbEncodingServerIdentity);
 
+  /* xvp */
+  if (se->nEncodings < MAX_ENCODINGS)
+    encs[se->nEncodings++] = rfbClientSwap32IfLE(rfbEncodingXvp);
 
   /* client extensions */
   for(e = rfbClientExtensions; e; e = e->next)
@@ -1395,6 +1398,37 @@ rfbBool PermitServerInput(rfbClient* client, int enabled)
 
 
 /*
+ * send xvp client message
+ * A client supporting the xvp extension sends this to request that the server initiate
+ * a clean shutdown, clean reboot or abrupt reset of the system whose framebuffer the
+ * client is displaying.
+ *
+ * only version 1 is defined in the protocol specs
+ *
+ * possible values for code are:
+ *   rfbXvp_Shutdown
+ *   rfbXvp_Reboot
+ *   rfbXvp_Reset
+ */
+
+rfbBool SendXvpMsg(rfbClient* client, uint8_t version, uint8_t code)
+{
+    rfbXvpMsg xvp;
+
+    if (!SupportsClient2Server(client, rfbXvp)) return TRUE;
+    xvp.type = rfbXvp;
+    xvp.pad = 0;
+    xvp.version = version;
+    xvp.code = code;
+
+    if (!WriteToRFBServer(client, (char *)&xvp, sz_rfbXvpMsg))
+        return FALSE;
+
+    return TRUE;
+}
+
+
+/*
  * SendPointerEvent.
  */
 
@@ -1984,6 +2018,24 @@ HandleRFBServerMessage(rfbClient* client)
       break;
   }
 
+  case rfbXvp:
+  {
+    if (!ReadFromRFBServer(client, ((char *)&msg) + 1,
+                           sz_rfbXvpMsg -1))
+      return FALSE;
+
+    SetClient2Server(client, rfbXvp);
+    /* technically, we only care what we can *send* to the server
+     * but, we set Server2Client Just in case it ever becomes useful
+     */
+    SetServer2Client(client, rfbXvp);
+
+    if(client->HandleXvpMsg)
+      client->HandleXvpMsg(client, msg.xvp.version, msg.xvp.code);
+
+    break;
+  }
+
   case rfbResizeFrameBuffer:
   {
     if (!ReadFromRFBServer(client, ((char *)&msg) + 1,