8366a20be8
Update files from Gregory Nutt to Apache 2.0 license. Signed-off-by: Alin Jerpelea <alin.jerpelea@sony.com>
369 lines
10 KiB
C
369 lines
10 KiB
C
/****************************************************************************
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* graphics/vnc/vnc_server.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 <stdint.h>
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#include <stdlib.h>
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#include <string.h>
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#include <queue.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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#include <arpa/inet.h>
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#include <netinet/in.h>
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#include <nuttx/kmalloc.h>
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#include <nuttx/net/net.h>
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#include "vnc_server.h"
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/****************************************************************************
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* Public Data
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****************************************************************************/
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/* Given a display number as an index, the following array can be used to
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* look-up the session structure for that display.
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*/
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FAR struct vnc_session_s *g_vnc_sessions[RFB_MAX_DISPLAYS];
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Name: vnc_reset_session
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*
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* Description:
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* Conclude the current VNC session. This function re-initializes the
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* session structure; it does not free either the session structure nor
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* the framebuffer so that they may be re-used.
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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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* None
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*
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****************************************************************************/
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static void vnc_reset_session(FAR struct vnc_session_s *session,
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FAR uint8_t *fb, int display)
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{
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int i;
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/* Close any open sockets */
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if (session->state >= VNCSERVER_CONNECTED)
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{
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psock_close(&session->connect);
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psock_close(&session->listen);
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}
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/* [Re-]initialize the session. */
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memset(&session->connect, 0, sizeof(struct socket));
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memset(&session->listen, 0, sizeof(struct socket));
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/* Put all of the pre-allocated update structures into the freelist */
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sq_init(&session->updqueue);
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sq_init(&session->updfree);
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for (i = 0; i < CONFIG_VNCSERVER_NUPDATES; i++)
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{
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sq_addlast((FAR sq_entry_t *)&session->updpool[i], &session->updfree);
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}
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/* Set the INITIALIZED state */
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nxsem_reset(&session->freesem, CONFIG_VNCSERVER_NUPDATES);
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nxsem_reset(&session->queuesem, 0);
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session->fb = fb;
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session->display = display;
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session->state = VNCSERVER_INITIALIZED;
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session->nwhupd = 0;
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session->change = true;
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/* Careful not to disturb the keyboard/mouse callouts set by
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* vnc_fbinitialize(). Client related data left in garbage state.
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*/
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}
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/****************************************************************************
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* Name: vnc_connect
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*
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* Description:
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* Wait for a connection from the VNC client
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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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* port - The listen port to use
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*
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* Returned Value:
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* Returns zero (OK) on success; a negated errno value on failure.
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*
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****************************************************************************/
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static int vnc_connect(FAR struct vnc_session_s *session, int port)
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{
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struct sockaddr_in addr;
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int ret;
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ginfo("Connecting display %d\n", session->display);
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/* Create a listening socket */
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addr.sin_family = AF_INET;
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addr.sin_port = htons(port);
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addr.sin_addr.s_addr = INADDR_ANY;
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ret = psock_socket(AF_INET, SOCK_STREAM, 0, &session->listen);
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if (ret < 0)
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{
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return ret;
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}
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/* Bind the listening socket to a local address */
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ret = psock_bind(&session->listen, (struct sockaddr *)&addr,
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sizeof(struct sockaddr_in));
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if (ret < 0)
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{
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goto errout_with_listener;
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}
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/* Listen for a connection */
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ret = psock_listen(&session->listen, 5);
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if (ret < 0)
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{
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goto errout_with_listener;
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}
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/* Connect to the client */
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ginfo("Accepting connection for Display %d\n", session->display);
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ret = psock_accept(&session->listen, NULL, NULL, &session->connect);
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if (ret < 0)
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{
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goto errout_with_listener;
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}
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ginfo("Display %d connected\n", session->display);
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session->state = VNCSERVER_CONNECTED;
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return OK;
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errout_with_listener:
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psock_close(&session->listen);
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return ret;
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}
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/****************************************************************************
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* Pubic Functions
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****************************************************************************/
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/****************************************************************************
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* Name: vnc_server
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*
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* Description:
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* The VNC server daemon. This daemon is implemented as a kernel thread.
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*
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* Input Parameters:
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* Standard kernel thread arguments (all ignored)
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*
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* Returned Value:
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* This function does not return.
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*
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****************************************************************************/
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int vnc_server(int argc, FAR char *argv[])
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{
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FAR struct vnc_session_s *session;
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FAR uint8_t *fb;
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int display;
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int ret;
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/* A single argument is expected: A display port number in ASCII form */
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if (argc != 2)
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{
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/* In this case the start-up logic will probably hang, waiting for the
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* display-related semaphore to be set.
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*/
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gerr("ERROR: Unexpected number of arguments: %d\n", argc);
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ret = -EINVAL;
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goto errout_with_hang;
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}
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display = atoi(argv[1]);
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if (display < 0 || display >= RFB_MAX_DISPLAYS)
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{
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/* In this case the start-up logic will probably hang, waiting for the
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* display-related semaphore to be set.
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*/
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gerr("ERROR: Invalid display number: %d\n", display);
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ret = -EINVAL;
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goto errout_with_hang;
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}
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ginfo("Server started for Display %d\n", display);
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/* Allocate the framebuffer memory. We rely on the fact that
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* the KMM allocator will align memory to 32-bits or better.
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*/
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fb = (FAR uint8_t *)kmm_zalloc(RFB_SIZE);
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if (fb == NULL)
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{
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gerr("ERROR: Failed to allocate framebuffer memory: %lu KB\n",
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(unsigned long)(RFB_SIZE / 1024));
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ret = -ENOMEM;
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goto errout_with_post;
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}
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/* Allocate a session structure for this display */
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session = kmm_zalloc(sizeof(struct vnc_session_s));
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if (session == NULL)
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{
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gerr("ERROR: Failed to allocate session\n");
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ret = -ENOMEM;
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goto errout_with_fb;
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}
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g_vnc_sessions[display] = session;
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nxsem_init(&session->freesem, 0, CONFIG_VNCSERVER_NUPDATES);
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nxsem_init(&session->queuesem, 0, 0);
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/* Inform any waiter that we have started */
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vnc_reset_session(session, fb, display);
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nxsem_post(&g_fbstartup[display].fbinit);
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/* Loop... handling each each VNC client connection to this display. Only
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* a single client is allowed for each display.
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*/
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for (; ; )
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{
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/* Release the last session and [Re-]initialize the session structure
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* for the next connection.
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*/
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vnc_reset_session(session, fb, display);
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g_fbstartup[display].result = -EBUSY;
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nxsem_reset(&g_fbstartup[display].fbconnect, 0);
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/* Establish a connection with the VNC client */
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ret = vnc_connect(session, RFB_DISPLAY_PORT(display));
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if (ret >= 0)
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{
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ginfo("New VNC connection\n");
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/* Perform the VNC initialization sequence after the client has
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* successfully connected to the server. Negotiate security,
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* framebuffer and color properties.
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*/
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ret = vnc_negotiate(session);
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if (ret < 0)
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{
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gerr("ERROR: Failed to negotiate security/framebuffer: %d\n",
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ret);
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continue;
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}
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/* Start the VNC updater thread that sends all Server-to-Client
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* messages.
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*/
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ret = vnc_start_updater(session);
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if (ret < 0)
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{
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gerr("ERROR: Failed to start updater thread: %d\n", ret);
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continue;
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}
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/* Let the framebuffer driver know that we are ready to perform
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* updates.
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*/
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g_fbstartup[display].result = OK;
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nxsem_post(&g_fbstartup[display].fbconnect);
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/* Run the VNC receiver on this trhead. The VNC receiver handles
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* all Client-to-Server messages. The VNC receiver function does
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* not return until the session has been terminated (or an error
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* occurs).
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*/
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ret = vnc_receiver(session);
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ginfo("Session terminated with %d\n", ret);
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UNUSED(ret);
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/* Stop the VNC updater thread. */
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ret = vnc_stop_updater(session);
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if (ret < 0)
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{
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gerr("ERROR: Failed to stop updater thread: %d\n", ret);
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}
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}
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}
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errout_with_fb:
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kmm_free(fb);
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errout_with_post:
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g_fbstartup[display].result = ret;
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nxsem_post(&g_fbstartup[display].fbconnect);
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errout_with_hang:
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return EXIT_FAILURE;
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}
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