libvncserver: add a destination port client property

...for outgoing/reverse connections.

Author: bk138

include/rfb/rfb.h

@@ -711,6 +711,8 @@ typedef struct _rfbClientRec {
     int tightPngDstDataLen;
 #endif
 #endif
+    /** Destination port in case of an outgoing/reverse connection  */
+    int destPort;
 } rfbClientRec, *rfbClientPtr;
 
 /**

src/libvncserver/rfbserver.c

@@ -271,6 +271,7 @@ rfbReverseConnection(rfbScreenInfoPtr rfbScreen,
 
     if (cl) {
         cl->reverseConnection = TRUE;
+        cl->destPort = port;
         if (!cl->onHold)
             rfbStartOnHoldClient(cl);
     }