493 lines
15 KiB
C
493 lines
15 KiB
C
/****************************************************************************
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* drivers/video/vnc/vnc_receiver.c
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <assert.h>
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#include <errno.h>
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#if defined(CONFIG_VNCSERVER_DEBUG) && !defined(CONFIG_DEBUG_GRAPHICS)
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# undef CONFIG_DEBUG_ERROR
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# undef CONFIG_DEBUG_WARN
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# undef CONFIG_DEBUG_INFO
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# undef CONFIG_DEBUG_GRAPHICS_ERROR
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# undef CONFIG_DEBUG_GRAPHICS_WARN
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# undef CONFIG_DEBUG_GRAPHICS_INFO
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# define CONFIG_DEBUG_ERROR 1
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# define CONFIG_DEBUG_WARN 1
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# define CONFIG_DEBUG_INFO 1
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# define CONFIG_DEBUG_GRAPHICS 1
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# define CONFIG_DEBUG_GRAPHICS_ERROR 1
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# define CONFIG_DEBUG_GRAPHICS_WARN 1
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# define CONFIG_DEBUG_GRAPHICS_INFO 1
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#endif
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#include <debug.h>
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#ifdef CONFIG_NET_SOCKOPTS
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# include <sys/time.h>
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#endif
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#include <nuttx/net/net.h>
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#include <nuttx/video/rfb.h>
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#include <nuttx/video/vnc.h>
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#include <nuttx/input/mouse.h>
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#include "vnc_server.h"
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Name: vnc_read_remainder
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*
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* Description:
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* After receiving the first byte of a client-to-server message, this
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* reads in the remainder of the message.
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*
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* Input Parameters:
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* session - An instance of the session structure.
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* msglen - The full length of the message
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*
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* Returned Value:
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* At present, always returns OK
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*
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****************************************************************************/
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int vnc_read_remainder(FAR struct vnc_session_s *session, size_t msglen,
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size_t offset)
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{
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ssize_t nrecvd;
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size_t ntotal;
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/* Loop until the rest of the message is received. */
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for (ntotal = 0; ntotal < msglen; offset += nrecvd, ntotal += nrecvd)
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{
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/* Receive more of the message */
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nrecvd = psock_recv(&session->connect, &session->inbuf[offset],
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msglen - ntotal, 0);
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if (nrecvd < 0)
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{
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gerr("ERROR: Receive message failed: %d\n", (int)nrecvd);
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return (int)nrecvd;
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}
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}
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return OK;
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}
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: vnc_receiver
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*
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* Description:
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* This function handles all Client-to-Server messages.
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*
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* Input Parameters:
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* session - An instance of the session structure.
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*
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* Returned Value:
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* At present, always returns OK
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*
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****************************************************************************/
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int vnc_receiver(FAR struct vnc_session_s *session)
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{
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#ifdef CONFIG_NET_SOCKOPTS
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struct timeval tv;
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#endif
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ssize_t nrecvd;
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int ret;
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DEBUGASSERT(session);
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ginfo("Receiver running for Display %d\n", session->display);
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#ifdef CONFIG_NET_SOCKOPTS
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/* Disable the receive timeout so that we will wait indefinitely for the
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* next Client-to-Server message.
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*/
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tv.tv_sec = 0;
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tv.tv_usec = 0;
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ret = psock_setsockopt(&session->connect, SOL_SOCKET, SO_RCVTIMEO,
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&tv, sizeof(struct timeval));
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if (ret < 0)
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{
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gerr("ERROR: Failed to disable receive timeout: %d\n", ret);
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return ret;
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}
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#endif
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/* Loop until the client disconnects or an unhandled error occurs */
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for (; ; )
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{
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/* Set up to read one byte which should be the message type of the
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* next Client-to-Server message. We will block here until the message
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* is received.
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*/
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nrecvd = psock_recv(&session->connect, session->inbuf, 1, 0);
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if (nrecvd < 0)
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{
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gerr("ERROR: Receive byte failed: %d\n", (int)nrecvd);
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return (int)nrecvd;
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}
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/* A return value of zero means that the connection was gracefully
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* closed by the VNC client.
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*/
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else if (nrecvd == 0)
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{
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gwarn("WARNING: Connection closed\n");
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return OK;
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}
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DEBUGASSERT(nrecvd == 1);
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/* The single byte received should be the message type. Handle the
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* message according to this message type.
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*/
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switch (session->inbuf[0])
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{
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case RFB_SETPIXELFMT_MSG: /* SetPixelFormat */
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{
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ginfo("Received SetPixelFormat\n");
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/* Read the rest of the SetPixelFormat message */
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ret = vnc_read_remainder(session,
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sizeof(struct rfb_setpixelformat_s) - 1,
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1);
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if (ret < 0)
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{
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gerr("ERROR: Failed to read SetPixelFormat message: %d\n",
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ret);
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}
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else
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{
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FAR struct rfb_setpixelformat_s *setformat =
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(FAR struct rfb_setpixelformat_s *)session->inbuf;
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ret = vnc_client_pixelformat(session, &setformat->format);
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if (ret < 0)
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{
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/* We do not support this pixel format */
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/* REVISIT:
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* We are going to be putting garbage on the RFB
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*/
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gerr("ERROR: PixelFormat not supported\n");
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}
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}
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}
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break;
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case RFB_SETENCODINGS_MSG: /* SetEncodings */
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{
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FAR struct rfb_setencodings_s *encodings;
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unsigned int nencodings;
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ginfo("Received SetEncodings\n");
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/* Read the SetEncodings message without the following
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* encodings.
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*/
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ret = vnc_read_remainder(session,
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SIZEOF_RFB_SERVERINIT_S(0) - 1,
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1);
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if (ret < 0)
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{
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gerr("ERROR: Failed to read SetEncodings message: %d\n",
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ret);
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}
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else
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{
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/* Read the following encodings */
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encodings = (FAR struct rfb_setencodings_s *)
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session->inbuf;
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nencodings = rfb_getbe16(encodings->nencodings);
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ret = vnc_read_remainder(session,
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nencodings * sizeof(uint32_t),
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SIZEOF_RFB_SERVERINIT_S(0));
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if (ret < 0)
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{
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gerr("ERROR: Failed to read encodings: %d\n",
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ret);
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}
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else
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{
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/* Pick out any mutually supported encodings */
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ret = vnc_client_encodings(session, encodings);
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if (ret < 0)
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{
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gerr("ERROR: vnc_set_encodings failed: %d\n", ret);
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}
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}
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}
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}
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break;
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case RFB_FBUPDATEREQ_MSG: /* FramebufferUpdateRequest */
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{
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FAR struct rfb_fbupdatereq_s *update;
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struct fb_area_s rect;
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ginfo("Received FramebufferUpdateRequest\n");
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/* Read the rest of the FramebufferUpdateRequest message */
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ret = vnc_read_remainder(session,
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sizeof(struct rfb_fbupdatereq_s) - 1,
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1);
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if (ret < 0)
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{
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gerr("ERROR: "
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"Failed to read FramebufferUpdateRequest message: %d\n",
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ret);
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}
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else
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{
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/* Enqueue the update */
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update = (FAR struct rfb_fbupdatereq_s *)session->inbuf;
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rect.x = rfb_getbe16(update->xpos);
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rect.y = rfb_getbe16(update->ypos);
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rect.w = rfb_getbe16(update->width);
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rect.h = rfb_getbe16(update->height);
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ret = vnc_update_rectangle(session, &rect, false);
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if (ret < 0)
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{
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gerr("ERROR: Failed to queue update: %d\n", ret);
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}
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}
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}
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break;
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case RFB_KEYEVENT_MSG: /* KeyEvent */
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{
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FAR struct rfb_keyevent_s *keyevent;
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ginfo("Received KeyEvent\n");
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/* Read the rest of the KeyEvent message */
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ret = vnc_read_remainder(session,
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sizeof(struct rfb_keyevent_s) - 1,
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1);
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if (ret < 0)
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{
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gerr("ERROR: Failed to read KeyEvent message: %d\n",
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ret);
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}
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else
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{
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/* Inject the key press/release event into NX */
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keyevent = (FAR struct rfb_keyevent_s *)session->inbuf;
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#ifdef CONFIG_VNCSERVER_KBD
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/* If uinput like virtual keyboard enabled, pass keycode to
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* keyboard driver.
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*
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* This driver cannot be used with NX now,
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* if vnc server works with NX, should not enable
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* CONFIG_VNCSERVER_KBD.
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*/
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session->kbdout(session->arg, keyevent->down,
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(FAR const uint8_t *)keyevent->key);
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#else
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vnc_key_map(session, rfb_getbe32(keyevent->key),
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(bool)keyevent->down);
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#endif
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}
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}
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break;
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case RFB_POINTEREVENT_MSG: /* PointerEvent */
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{
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FAR struct rfb_pointerevent_s *event;
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uint8_t buttons;
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ginfo("Received PointerEvent\n");
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/* Read the rest of the PointerEvent message */
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ret = vnc_read_remainder(session,
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sizeof(struct rfb_pointerevent_s) - 1,
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1);
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if (ret < 0)
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{
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gerr("ERROR: Failed to read PointerEvent message: %d\n",
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ret);
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}
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else if (session->mouseout != NULL)
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{
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event = (FAR struct rfb_pointerevent_s *)session->inbuf;
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/* Map buttons bitmap. Bits 0-7 are buttons 1-8, 0=up,
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* 1=down. By convention Bit 0 = left button, Bit 1 =
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* middle button, and Bit 2 = right button.
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*/
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buttons = 0;
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if ((event->buttons & (1 << 0)) != 0)
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{
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buttons |= MOUSE_BUTTON_1;
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}
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if ((event->buttons & (1 << 1)) != 0)
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{
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buttons |= MOUSE_BUTTON_2;
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}
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if ((event->buttons & (1 << 2)) != 0)
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{
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buttons |= MOUSE_BUTTON_3;
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}
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session->mouseout(session->arg,
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(fb_coord_t)rfb_getbe16(event->xpos),
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(fb_coord_t)rfb_getbe16(event->ypos),
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buttons);
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}
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}
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break;
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case RFB_CLIENTCUTTEXT_MSG: /* ClientCutText */
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{
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FAR struct rfb_clientcuttext_s *cuttext;
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uint32_t length;
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ginfo("Received ClientCutText\n");
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/* Read the ClientCutText message without the following
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* text.
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*/
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ret = vnc_read_remainder(session,
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SIZEOF_RFB_CLIENTCUTTEXT_S(0) - 1,
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1);
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if (ret < 0)
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{
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gerr("ERROR: Failed to read ClientCutText message: %d\n",
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ret);
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}
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else
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{
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/* Read the following text */
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cuttext = (FAR struct rfb_clientcuttext_s *)session->inbuf;
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length = rfb_getbe32(cuttext->length);
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ret = vnc_read_remainder(session, length,
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SIZEOF_RFB_CLIENTCUTTEXT_S(0));
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if (ret < 0)
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{
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gerr("ERROR: Failed to read text: %d\n",
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ret);
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}
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else
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{
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/* REVISIT: ClientCutText is currently ignored */
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}
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}
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}
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break;
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default:
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gerr("ERROR: Unsynchronized, msgtype=%d\n", session->inbuf[0]);
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return -EPROTO;
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}
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}
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return -ENOSYS;
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}
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/****************************************************************************
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* Name: vnc_client_encodings
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*
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* Description:
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* Pick out any mutually supported encodings from the Client-to-Server
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* SetEncodings message
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*
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* Input Parameters:
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* session - An instance of the session structure.
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* encodings - The received SetEncodings message
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*
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* Returned Value:
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* At present, always returns OK
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*
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****************************************************************************/
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int vnc_client_encodings(FAR struct vnc_session_s *session,
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FAR struct rfb_setencodings_s *encodings)
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{
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uint32_t encoding;
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unsigned int nencodings;
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unsigned int i;
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DEBUGASSERT(session != NULL && encodings != NULL);
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/* Assume that there are no common encodings (other than RAW) */
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session->rre = false;
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/* Loop for each client supported encoding */
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nencodings = rfb_getbe16(encodings->nencodings);
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for (i = 0; i < nencodings; i++)
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{
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/* Get the next encoding */
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encoding = rfb_getbe32(&encodings->encodings[i << 2]);
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/* Only a limited support for of RRE is available now. */
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if (encoding == RFB_ENCODING_RRE)
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{
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session->rre = true;
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}
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}
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session->change = true;
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return OK;
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}
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