GUAC-744: Send ready instruction after guac_client_init.

src/guacd/daemon.c

@@ -236,7 +236,9 @@ void guacd_handle_connection(guac_socket* socket) {
         return;
     }
 
+    /* Send connection ID */
     guacd_log_info("Connection ID is \"%s\"", client->connection_id);
+    guac_protocol_send_ready(socket, client->connection_id);
 
     /* Start client threads */
     guacd_log_info("Starting client");

src/libguac/guacamole/protocol.h

@@ -165,6 +165,18 @@ int guac_protocol_send_nest(guac_socket* socket, int index,
  */
 int guac_protocol_send_nop(guac_socket* socket);
 
+/**
+ * Sends a ready instruction over the given guac_socket connection.
+ *
+ * If an error occurs sending the instruction, a non-zero value is
+ * returned, and guac_error is set appropriately.
+ *
+ * @param socket The guac_socket connection to use.
+ * @param id The connection ID of the connection that is ready.
+ * @return Zero on success, non-zero on error.
+ */
+int guac_protocol_send_ready(guac_socket* socket, const char* id);
+
 /**
  * Sends a set instruction over the given guac_socket connection.
  *

src/libguac/protocol.c

@@ -1060,6 +1060,21 @@ int guac_protocol_send_push(guac_socket* socket, const guac_layer* layer) {
 
 }
 
+int guac_protocol_send_ready(guac_socket* socket, const char* id) {
+
+    int ret_val;
+
+    guac_socket_instruction_begin(socket);
+    ret_val =
+           guac_socket_write_string(socket, "5.ready,")
+        || __guac_socket_write_length_string(socket, id)
+        || guac_socket_write_string(socket, ";");
+
+    guac_socket_instruction_end(socket);
+    return ret_val;
+
+}
+
 int guac_protocol_send_rect(guac_socket* socket,
         const guac_layer* layer, int x, int y, int width, int height) {