373 lines
12 KiB
C
373 lines
12 KiB
C
/****************************************************************************
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* graphics/vnc/vnc_receiver.c
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*
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* Copyright (C) 2016 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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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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#include <debug.h>
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#include <nuttx/net/net.h>
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#include <nuttx/video/rfb.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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int errcode;
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/* Loop until the rest of the message is recieved. */
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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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errcode = get_errno();
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gdbg("ERROR: Receive message failed: %d\n", errcode);
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DEBUGASSERT(errcode > 0);
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return -errcode;
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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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ssize_t nrecvd;
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int errcode;
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int ret;
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DEBUGASSERT(session);
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gvdbg("Receiver running for Display %d\n", session->display);
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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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errcode = get_errno();
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gdbg("ERROR: Receive byte failed: %d\n", errcode);
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DEBUGASSERT(errcode > 0);
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return -errcode;
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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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/* 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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gdbg("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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/* REVISIT: SetPixelFormat is currently ignored */
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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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uint32_t nencodings;
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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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gdbg("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 *)session->inbuf;
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nencodings = rfb_getbe32(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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gdbg("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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/* REVISIT: SetEncodings is currently ignored */
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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 nxgl_rect_s rect;
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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_fbupdatereq_s) - 1,
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1);
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if (ret < 0)
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{
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gdbg("ERROR: 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.pt1.x = rfb_getbe16(update->xpos);
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rect.pt1.y = rfb_getbe16(update->ypos);
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rect.pt2.x = rect.pt1.x + rfb_getbe16(update->width);
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rect.pt2.y = rect.pt1.y + rfb_getbe16(update->height);
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ret = vnc_update_rectangle(session, &rect);
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if (ret < 0)
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{
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gdbg("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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/* 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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gdbg("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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vnc_key_map(session, rfb_getbe16(keyevent->key),
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(bool)keyevent->down);
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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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#ifdef CONFIG_NX_XYINPUT
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FAR struct rfb_pointerevent_s *event;
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uint8_t buttons;
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#endif
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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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gdbg("ERROR: Failed to read PointerEvent message: %d\n",
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ret);
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}
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#ifdef CONFIG_NX_XYINPUT
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else
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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 |= NX_MOUSE_LEFTBUTTON;
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}
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if ((event->buttons & (1 << 1)) != 0)
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{
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buttons |= NX_MOUSE_CENTERBUTTON;
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}
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if ((event->buttons & (1 << 2)) != 0)
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{
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buttons |= NX_MOUSE_RIGHTBUTTON;
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}
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ret = nx_mousein(session->handle,
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(nxgl_coord_t)rfb_getbe16(event->xpos),
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(nxgl_coord_t)rfb_getbe16(event->ypos),
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buttons);
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if (ret < 0)
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{
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gdbg("ERROR: nx_mousein failed: %d\n", ret);
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}
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}
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#endif
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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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/* 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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gdbg("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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gdbg("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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gdbg("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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