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nuttx/graphics/vnc/server/vnc_receiver.c
Xiang Xiao 6a3c2aded6 Fix wait loop and void cast (#24) 
* Simplify EINTR/ECANCEL error handling

1. Add semaphore uninterruptible wait function
2 .Replace semaphore wait loop with a single uninterruptible wait
3. Replace all sem_xxx to nxsem_xxx

* Unify the void cast usage

1. Remove void cast for function because many place ignore the returned value witout cast
2. Replace void cast for variable with UNUSED macro
2020-01-02 10:54:43 -06:00

522 lines
16 KiB
C
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/****************************************************************************
* graphics/vnc/vnc_receiver.c
*
* Copyright (C) 2016 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* 3. Neither the name NuttX nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <assert.h>
#include <errno.h>
#if defined(CONFIG_VNCSERVER_DEBUG) && !defined(CONFIG_DEBUG_GRAPHICS)
# undef CONFIG_DEBUG_ERROR
# undef CONFIG_DEBUG_WARN
# undef CONFIG_DEBUG_INFO
# undef CONFIG_DEBUG_GRAPHICS_ERROR
# undef CONFIG_DEBUG_GRAPHICS_WARN
# undef CONFIG_DEBUG_GRAPHICS_INFO
# define CONFIG_DEBUG_ERROR 1
# define CONFIG_DEBUG_WARN 1
# define CONFIG_DEBUG_INFO 1
# define CONFIG_DEBUG_GRAPHICS 1
# define CONFIG_DEBUG_GRAPHICS_ERROR 1
# define CONFIG_DEBUG_GRAPHICS_WARN 1
# define CONFIG_DEBUG_GRAPHICS_INFO 1
#endif
#include <debug.h>
#ifdef CONFIG_NET_SOCKOPTS
# include <sys/time.h>
#endif
#include <nuttx/net/net.h>
#include <nuttx/video/rfb.h>
#include <nuttx/video/vnc.h>
#include <nuttx/nx/nx.h>
#include <nuttx/nx/nxglib.h>
#include "vnc_server.h"
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: vnc_read_remainder
*
* Description:
* After receiving the first byte of a client-to-server message, this
* reads in the remainder of the message.
*
* Input Parameters:
* session - An instance of the session structure.
* msglen - The full length of the message
*
* Returned Value:
* At present, always returns OK
*
****************************************************************************/
int vnc_read_remainder(FAR struct vnc_session_s *session, size_t msglen,
size_t offset)
{
ssize_t nrecvd;
size_t ntotal;
/* Loop until the rest of the message is received. */
for (ntotal = 0; ntotal < msglen; offset += nrecvd, ntotal += nrecvd)
{
/* Receive more of the message */
nrecvd = psock_recv(&session->connect, &session->inbuf[offset],
msglen - ntotal, 0);
if (nrecvd < 0)
{
gerr("ERROR: Receive message failed: %d\n", (int)nrecvd);
return (int)nrecvd;
}
}
return OK;
}
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: vnc_receiver
*
* Description:
* This function handles all Client-to-Server messages.
*
* Input Parameters:
* session - An instance of the session structure.
*
* Returned Value:
* At present, always returns OK
*
****************************************************************************/
int vnc_receiver(FAR struct vnc_session_s *session)
{
#ifdef CONFIG_NET_SOCKOPTS
struct timeval tv;
#endif
ssize_t nrecvd;
int ret;
DEBUGASSERT(session);
ginfo("Receiver running for Display %d\n", session->display);
#ifdef CONFIG_NET_SOCKOPTS
/* Disable the receive timeout so that we will wait indefinitely for the
* next Client-to-Server message.
*/
tv.tv_sec = 0;
tv.tv_usec = 0;
ret = psock_setsockopt(&session->connect, SOL_SOCKET, SO_RCVTIMEO,
&tv, sizeof(struct timeval));
if (ret < 0)
{
gerr("ERROR: Failed to disable receive timeout: %d\n", ret);
return ret;
}
#endif
/* Loop until the client disconnects or an unhandled error occurs */
for (; ; )
{
/* Set up to read one byte which should be the message type of the
* next Client-to-Server message. We will block here until the message
* is received.
*/
nrecvd = psock_recv(&session->connect, session->inbuf, 1, 0);
if (nrecvd < 0)
{
gerr("ERROR: Receive byte failed: %d\n", (int)nrecvd);
return (int)nrecvd;
}
/* A return value of zero means that the connection was gracefully
* closed by the VNC client.
*/
else if (nrecvd == 0)
{
gwarn("WARNING: Connection closed\n");
return OK;
}
DEBUGASSERT(nrecvd == 1);
/* The single byte received should be the message type. Handle the
* message according to this message type.
*/
switch (session->inbuf[0])
{
case RFB_SETPIXELFMT_MSG: /* SetPixelFormat */
{
ginfo("Received SetPixelFormat\n");
/* Read the rest of the SetPixelFormat message */
ret = vnc_read_remainder(session,
sizeof(struct rfb_setpixelformat_s) - 1,
1);
if (ret < 0)
{
gerr("ERROR: Failed to read SetPixelFormat message: %d\n",
ret);
}
else
{
FAR struct rfb_setpixelformat_s *setformat =
(FAR struct rfb_setpixelformat_s *)session->inbuf;
ret = vnc_client_pixelformat(session, &setformat->format);
if (ret < 0)
{
/* We do not support this pixel format */
/* REVISIT: We are going to be putting garbage on the RFB */
gerr("ERROR: PixelFormat not supported\n");
}
}
}
break;
case RFB_SETENCODINGS_MSG: /* SetEncodings */
{
FAR struct rfb_setencodings_s *encodings;
unsigned int nencodings;
ginfo("Received SetEncodings\n");
/* Read the SetEncodings message without the following
* encodings.
*/
ret = vnc_read_remainder(session,
SIZEOF_RFB_SERVERINIT_S(0) - 1,
1);
if (ret < 0)
{
gerr("ERROR: Failed to read SetEncodings message: %d\n",
ret);
}
else
{
/* Read the following encodings */
encodings = (FAR struct rfb_setencodings_s *)session->inbuf;
nencodings = rfb_getbe16(encodings->nencodings);
ret = vnc_read_remainder(session,
nencodings * sizeof(uint32_t),
SIZEOF_RFB_SERVERINIT_S(0));
if (ret < 0)
{
gerr("ERROR: Failed to read encodings: %d\n",
ret);
}
else
{
/* Pick out any mutually supported encodings */
ret = vnc_client_encodings(session, encodings);
if (ret < 0)
{
gerr("ERROR: vnc_set_encodings failed: %d\n", ret);
}
}
}
}
break;
case RFB_FBUPDATEREQ_MSG: /* FramebufferUpdateRequest */
{
FAR struct rfb_fbupdatereq_s *update;
struct nxgl_rect_s rect;
ginfo("Received FramebufferUpdateRequest\n");
/* Read the rest of the FramebufferUpdateRequest message */
ret = vnc_read_remainder(session,
sizeof(struct rfb_fbupdatereq_s) - 1,
1);
if (ret < 0)
{
gerr("ERROR: Failed to read FramebufferUpdateRequest message: %d\n",
ret);
}
else
{
/* Enqueue the update */
update = (FAR struct rfb_fbupdatereq_s *)session->inbuf;
rect.pt1.x = rfb_getbe16(update->xpos);
rect.pt1.y = rfb_getbe16(update->ypos);
rect.pt2.x = rect.pt1.x + rfb_getbe16(update->width);
rect.pt2.y = rect.pt1.y + rfb_getbe16(update->height);
ret = vnc_update_rectangle(session, &rect, false);
if (ret < 0)
{
gerr("ERROR: Failed to queue update: %d\n", ret);
}
}
}
break;
case RFB_KEYEVENT_MSG: /* KeyEvent */
{
FAR struct rfb_keyevent_s *keyevent;
ginfo("Received KeyEvent\n");
/* Read the rest of the KeyEvent message */
ret = vnc_read_remainder(session,
sizeof(struct rfb_keyevent_s) - 1,
1);
if (ret < 0)
{
gerr("ERROR: Failed to read KeyEvent message: %d\n",
ret);
}
else
{
/* Inject the key press/release event into NX */
keyevent = (FAR struct rfb_keyevent_s *)session->inbuf;
vnc_key_map(session, rfb_getbe16(keyevent->key),
(bool)keyevent->down);
}
}
break;
case RFB_POINTEREVENT_MSG: /* PointerEvent */
{
#ifdef CONFIG_NX_XYINPUT
FAR struct rfb_pointerevent_s *event;
uint8_t buttons;
#endif
ginfo("Received PointerEvent\n");
/* Read the rest of the PointerEvent message */
ret = vnc_read_remainder(session,
sizeof(struct rfb_pointerevent_s) - 1,
1);
if (ret < 0)
{
gerr("ERROR: Failed to read PointerEvent message: %d\n",
ret);
}
#ifdef CONFIG_NX_XYINPUT
/* REVISIT: How will be get the NX handle? */
else if (session->mouseout != NULL)
{
event = (FAR struct rfb_pointerevent_s *)session->inbuf;
/* Map buttons bitmap. Bits 0-7 are buttons 1-8, 0=up,
* 1=down. By convention Bit 0 = left button, Bit 1 =
* middle button, and Bit 2 = right button.
*/
buttons = 0;
if ((event->buttons & (1 << 0)) != 0)
{
buttons |= NX_MOUSE_LEFTBUTTON;
}
if ((event->buttons & (1 << 1)) != 0)
{
buttons |= NX_MOUSE_CENTERBUTTON;
}
if ((event->buttons & (1 << 2)) != 0)
{
buttons |= NX_MOUSE_RIGHTBUTTON;
}
session->mouseout(session->arg,
(nxgl_coord_t)rfb_getbe16(event->xpos),
(nxgl_coord_t)rfb_getbe16(event->ypos),
buttons);
}
#endif
}
break;
case RFB_CLIENTCUTTEXT_MSG: /* ClientCutText */
{
FAR struct rfb_clientcuttext_s *cuttext;
uint32_t length;
ginfo("Received ClientCutText\n");
/* Read the ClientCutText message without the following
* text.
*/
ret = vnc_read_remainder(session,
SIZEOF_RFB_CLIENTCUTTEXT_S(0) - 1,
1);
if (ret < 0)
{
gerr("ERROR: Failed to read ClientCutText message: %d\n",
ret);
}
else
{
/* Read the following text */
cuttext = (FAR struct rfb_clientcuttext_s *)session->inbuf;
length = rfb_getbe32(cuttext->length);
ret = vnc_read_remainder(session, length,
SIZEOF_RFB_CLIENTCUTTEXT_S(0));
if (ret < 0)
{
gerr("ERROR: Failed to read text: %d\n",
ret);
}
else
{
/* REVISIT: ClientCutText is currently ignored */
}
}
}
break;
default:
gerr("ERROR: Unsynchronized, msgtype=%d\n", session->inbuf[0]);
return -EPROTO;
}
}
return -ENOSYS;
}
/****************************************************************************
* Name: vnc_client_encodings
*
* Description:
* Pick out any mutually supported encodings from the Client-to-Server
* SetEncodings message
*
* Input Parameters:
* session - An instance of the session structure.
* encodings - The received SetEncodings message
*
* Returned Value:
* At present, always returns OK
*
****************************************************************************/
int vnc_client_encodings(FAR struct vnc_session_s *session,
FAR struct rfb_setencodings_s *encodings)
{
uint32_t encoding;
unsigned int nencodings;
unsigned int i;
DEBUGASSERT(session != NULL && encodings != NULL);
/* Assume that there are no common encodings (other than RAW) */
session->rre = false;
/* Loop for each client supported encoding */
nencodings = rfb_getbe16(encodings->nencodings);
for (i = 0; i < nencodings; i++)
{
/* Get the next encoding */
encoding = rfb_getbe32(&encodings->encodings[i << 2]);
/* Only a limited support for of RRE is vailable now. */
if (encoding == RFB_ENCODING_RRE)
{
session->rre = true;
}
}
session->change = true;
return OK;
}
/****************************************************************************
* Name: vnc_mouse
*
* Description:
* This is the default keyboard/mouse callout function. This is simply a
* wrapper around nx_mousein(). When
* configured using vnc_fbinitialize(), the 'arg' must be the correct
* NXHANDLE value.
*
* Input Parameters:
* See vnc_mouseout_t and vnc_kbdout_t typde definitions above. These
* callouts have arguments that match the inputs to nx_kbdin() and
* nx_mousein() (if arg is really of type NXHANDLE).
*
* Returned Value:
* None
*
****************************************************************************/
#ifdef CONFIG_NX_XYINPUT
void vnc_mouseout(FAR void *arg, nxgl_coord_t x, nxgl_coord_t y,
uint8_t buttons)
{
DEBUGASSERT(arg != NULL);
nx_mousein((NXHANDLE)arg, x, y, buttons);
}
#endif
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