Steve Karg
1028 lines
36 KiB
C
1028 lines
36 KiB
C
/**
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* @file
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* @brief Implementation of server websocket interface.
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* @author Kirill Neznamov <kirill.neznamov@dsr-corporation.com>
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* @date June 2022
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* @copyright SPDX-License-Identifier: GPL-2.0-or-later WITH GCC-exception-2.0
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*/
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#include <libwebsockets.h>
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#include <string.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <pthread.h>
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#include "bacnet/datalink/bsc/websocket.h"
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#include "bacnet/basic/sys/debug.h"
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#include "websocket-global.h"
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#include <arpa/inet.h>
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#define DEBUG_WEBSOCKET_SERVER 0
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#undef DEBUG_PRINTF
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#if DEBUG_WEBSOCKET_SERVER == 1
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#define DEBUG_PRINTF debug_printf
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#else
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#undef DEBUG_ENABLED
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#define DEBUG_PRINTF debug_printf_disabled
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#endif
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#define BSC_RX_BUFFER_LEN BSC_WEBSOCKET_RX_BUFFER_LEN
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#ifndef LWS_PROTOCOL_LIST_TERM
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#define LWS_PROTOCOL_LIST_TERM \
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{ \
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NULL, NULL, 0, 0, 0, NULL, 0 \
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}
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#endif
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typedef enum {
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BSC_WEBSOCKET_STATE_IDLE = 0,
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BSC_WEBSOCKET_STATE_CONNECTED = 1,
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BSC_WEBSOCKET_STATE_DISCONNECTING = 2
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} BSC_WEBSOCKET_STATE;
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/* Some forward function declarations */
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static int bws_srv_websocket_event(
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struct lws *wsi,
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enum lws_callback_reasons reason,
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void *user,
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void *in,
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size_t len);
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typedef struct {
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struct lws_context *ctx;
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struct lws *ws;
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BSC_WEBSOCKET_STATE state;
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bool want_send_data;
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bool can_send_data;
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uint8_t *fragment_buffer;
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size_t fragment_buffer_size;
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size_t fragment_buffer_len;
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BACNET_ERROR_CODE err_code;
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} BSC_WEBSOCKET_CONNECTION;
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#if BSC_CONF_WEBSOCKET_SERVERS_NUM < 1
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#error "BSC_CONF_WEBSOCKET_SERVERS_NUM must be >= 1"
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#endif
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static pthread_mutex_t bws_global_mutex = PTHREAD_RECURSIVE_MUTEX_INITIALIZER;
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static pthread_mutex_t bws_srv_direct_mutex[BSC_CONF_WEBSOCKET_SERVERS_NUM];
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static pthread_mutex_t bws_srv_hub_mutex[BSC_CONF_WEBSOCKET_SERVERS_NUM];
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#if BSC_SERVER_HUB_WEBSOCKETS_MAX_NUM > 0
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static BSC_WEBSOCKET_CONNECTION
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bws_hub_conn[BSC_CONF_WEBSOCKET_SERVERS_NUM]
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[BSC_SERVER_HUB_WEBSOCKETS_MAX_NUM] = { 0 };
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#else
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static BSC_WEBSOCKET_CONNECTION bws_hub_conn[1][1] = { 0 };
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#endif
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#if BSC_SERVER_DIRECT_WEBSOCKETS_MAX_NUM > 0
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static BSC_WEBSOCKET_CONNECTION
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bws_direct_conn[BSC_CONF_WEBSOCKET_SERVERS_NUM]
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[BSC_SERVER_DIRECT_WEBSOCKETS_MAX_NUM] = { 0 };
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#else
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static BSC_WEBSOCKET_CONNECTION bws_direct_conn[1][1] = { 0 };
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#endif
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typedef struct BACNetWebsocketServerContext {
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bool used;
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struct lws_context *wsctx;
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BSC_WEBSOCKET_PROTOCOL proto;
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BSC_WEBSOCKET_CONNECTION *conn;
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pthread_mutex_t *mutex;
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BSC_WEBSOCKET_SRV_DISPATCH dispatch_func;
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void *user_param;
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bool stop_worker;
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} BSC_WEBSOCKET_CONTEXT;
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static BSC_WEBSOCKET_CONTEXT bws_hub_ctx[BSC_CONF_WEBSOCKET_SERVERS_NUM] = {
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0
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};
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static BSC_WEBSOCKET_CONTEXT bws_direct_ctx[BSC_CONF_WEBSOCKET_SERVERS_NUM] = {
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0
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};
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static bool bws_mutex_init(pthread_mutex_t *mutex)
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{
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pthread_mutexattr_t attr;
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if (pthread_mutexattr_init(&attr) != 0) {
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return false;
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}
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if (pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE) != 0) {
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pthread_mutexattr_destroy(&attr);
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return false;
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}
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if (pthread_mutex_init(mutex, &attr) != 0) {
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pthread_mutexattr_destroy(&attr);
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return false;
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}
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pthread_mutexattr_destroy(&attr);
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return true;
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}
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static BSC_WEBSOCKET_CONTEXT *bws_alloc_server_ctx(BSC_WEBSOCKET_PROTOCOL proto)
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{
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int i;
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BSC_WEBSOCKET_CONTEXT *ctx = (proto == BSC_WEBSOCKET_HUB_PROTOCOL)
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? &bws_hub_ctx[0]
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: &bws_direct_ctx[0];
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pthread_mutex_lock(&bws_global_mutex);
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DEBUG_PRINTF("bws_alloc_server_ctx() >>> proto = %d\n", proto);
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for (i = 0; i < BSC_CONF_WEBSOCKET_SERVERS_NUM; i++) {
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if (!ctx[i].used) {
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if (proto == BSC_WEBSOCKET_HUB_PROTOCOL) {
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ctx[i].mutex = &bws_srv_hub_mutex[i];
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ctx[i].conn = &bws_hub_conn[i][0];
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} else {
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ctx[i].mutex = &bws_srv_direct_mutex[i];
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ctx[i].conn = &bws_direct_conn[i][0];
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}
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if (!bws_mutex_init(ctx[i].mutex)) {
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DEBUG_PRINTF("bws_alloc_server_ctx() <<< ret = %p\n", &ctx[i]);
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pthread_mutex_unlock(&bws_global_mutex);
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return NULL;
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}
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ctx[i].used = true;
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DEBUG_PRINTF("bws_alloc_server_ctx() <<< ret = %p\n", &ctx[i]);
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pthread_mutex_unlock(&bws_global_mutex);
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return &ctx[i];
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}
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}
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DEBUG_PRINTF("bws_alloc_server_ctx() <<< ret = %p\n", &ctx[i]);
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pthread_mutex_unlock(&bws_global_mutex);
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return NULL;
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}
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static void bws_set_disconnect_reason(
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BSC_WEBSOCKET_CONTEXT *ctx, BSC_WEBSOCKET_HANDLE h, uint16_t err_code)
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{
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switch (err_code) {
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case LWS_CLOSE_STATUS_NORMAL: {
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ctx->conn[h].err_code = ERROR_CODE_WEBSOCKET_CLOSED_BY_PEER;
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break;
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}
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case LWS_CLOSE_STATUS_GOINGAWAY: {
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ctx->conn[h].err_code = ERROR_CODE_WEBSOCKET_ENDPOINT_LEAVES;
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break;
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}
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case LWS_CLOSE_STATUS_PROTOCOL_ERR: {
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ctx->conn[h].err_code = ERROR_CODE_WEBSOCKET_PROTOCOL_ERROR;
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break;
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}
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case LWS_CLOSE_STATUS_UNACCEPTABLE_OPCODE: {
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ctx->conn[h].err_code = ERROR_CODE_WEBSOCKET_DATA_NOT_ACCEPTED;
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break;
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}
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case LWS_CLOSE_STATUS_NO_STATUS:
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case LWS_CLOSE_STATUS_RESERVED: {
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ctx->conn[h].err_code = ERROR_CODE_WEBSOCKET_ERROR;
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break;
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}
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case LWS_CLOSE_STATUS_ABNORMAL_CLOSE: {
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ctx->conn[h].err_code = ERROR_CODE_WEBSOCKET_DATA_NOT_ACCEPTED;
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break;
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}
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case LWS_CLOSE_STATUS_INVALID_PAYLOAD: {
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ctx->conn[h].err_code = ERROR_CODE_WEBSOCKET_DATA_INCONSISTENT;
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break;
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}
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case LWS_CLOSE_STATUS_POLICY_VIOLATION: {
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ctx->conn[h].err_code = ERROR_CODE_WEBSOCKET_DATA_AGAINST_POLICY;
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break;
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}
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case LWS_CLOSE_STATUS_MESSAGE_TOO_LARGE: {
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ctx->conn[h].err_code = ERROR_CODE_WEBSOCKET_FRAME_TOO_LONG;
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break;
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}
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case LWS_CLOSE_STATUS_EXTENSION_REQUIRED: {
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ctx->conn[h].err_code = ERROR_CODE_WEBSOCKET_EXTENSION_MISSING;
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break;
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}
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case LWS_CLOSE_STATUS_UNEXPECTED_CONDITION: {
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ctx->conn[h].err_code = ERROR_CODE_WEBSOCKET_REQUEST_UNAVAILABLE;
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break;
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}
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default: {
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ctx->conn[h].err_code = ERROR_CODE_WEBSOCKET_ERROR;
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break;
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}
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}
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}
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static void bws_free_server_ctx(BSC_WEBSOCKET_CONTEXT *ctx)
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{
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pthread_mutex_lock(&bws_global_mutex);
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DEBUG_PRINTF("bws_free_server_ctx() >>> ctx = %p\n", ctx);
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ctx->used = false;
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ctx->wsctx = NULL;
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ctx->conn = NULL;
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pthread_mutex_destroy(ctx->mutex);
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ctx->mutex = NULL;
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ctx->dispatch_func = NULL;
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ctx->user_param = NULL;
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DEBUG_PRINTF("bws_free_server_ctx() <<< \n");
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pthread_mutex_unlock(&bws_global_mutex);
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}
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#if DEBUG_ENABLED == 1
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static bool bws_validate_ctx_pointer(BSC_WEBSOCKET_CONTEXT *ctx)
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{
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bool is_validated = false;
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int i;
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pthread_mutex_lock(&bws_global_mutex);
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for (i = 0; i < BSC_CONF_WEBSOCKET_SERVERS_NUM; i++) {
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if (ctx == &bws_hub_ctx[i]) {
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is_validated = true;
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break;
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}
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}
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if (!is_validated) {
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for (i = 0; i < BSC_CONF_WEBSOCKET_SERVERS_NUM; i++) {
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if (ctx == &bws_direct_ctx[i]) {
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is_validated = true;
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break;
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}
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}
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}
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pthread_mutex_unlock(&bws_global_mutex);
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return is_validated;
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}
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#endif
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static int bws_srv_get_max_sockets(BSC_WEBSOCKET_PROTOCOL proto)
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{
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int max = 0;
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if (proto == BSC_WEBSOCKET_HUB_PROTOCOL) {
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max = BSC_SERVER_HUB_WEBSOCKETS_MAX_NUM;
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} else if (proto == BSC_WEBSOCKET_DIRECT_PROTOCOL) {
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max = BSC_SERVER_DIRECT_WEBSOCKETS_MAX_NUM;
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}
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return max;
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}
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static BSC_WEBSOCKET_HANDLE bws_srv_alloc_connection(BSC_WEBSOCKET_CONTEXT *ctx)
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{
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int i;
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DEBUG_PRINTF("bws_srv_alloc_connection() >>> ctx = %p\n", ctx);
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for (i = 0; i < bws_srv_get_max_sockets(ctx->proto); i++) {
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if (ctx->conn[i].state == BSC_WEBSOCKET_STATE_IDLE) {
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memset(&ctx->conn[i], 0, sizeof(ctx->conn[i]));
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DEBUG_PRINTF("bws_srv_alloc_connection() <<< ret = %d\n", i);
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return i;
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}
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}
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DEBUG_PRINTF("bws_srv_alloc_connection() <<< ret = "
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"BSC_WEBSOCKET_INVALID_HANDLE\n");
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return BSC_WEBSOCKET_INVALID_HANDLE;
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}
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static void
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bws_srv_free_connection(BSC_WEBSOCKET_CONTEXT *ctx, BSC_WEBSOCKET_HANDLE h)
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{
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DEBUG_PRINTF("bws_srv_free_connection() >>> ctx = %p, h = %d\n", ctx, h);
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if (h >= 0 && h < bws_srv_get_max_sockets(ctx->proto)) {
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if (ctx->conn[h].state != BSC_WEBSOCKET_STATE_IDLE) {
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if (ctx->conn[h].fragment_buffer) {
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free(ctx->conn[h].fragment_buffer);
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ctx->conn[h].fragment_buffer = NULL;
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ctx->conn[h].fragment_buffer_len = 0;
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ctx->conn[h].fragment_buffer_size = 0;
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}
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ctx->conn[h].state = BSC_WEBSOCKET_STATE_IDLE;
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ctx->conn[h].ws = NULL;
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}
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}
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DEBUG_PRINTF("bws_srv_free_connection() <<<\n");
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}
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static BSC_WEBSOCKET_HANDLE
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bws_find_connnection(BSC_WEBSOCKET_CONTEXT *ctx, struct lws *ws)
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{
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int i;
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for (i = 0; i < bws_srv_get_max_sockets(ctx->proto); i++) {
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if (ctx->conn[i].ws == ws &&
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ctx->conn[i].state != BSC_WEBSOCKET_STATE_IDLE) {
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return i;
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}
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}
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return BSC_WEBSOCKET_INVALID_HANDLE;
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}
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static int bws_srv_websocket_event(
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struct lws *wsi,
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enum lws_callback_reasons reason,
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void *user,
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void *in,
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size_t len)
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{
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BSC_WEBSOCKET_HANDLE h;
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BSC_WEBSOCKET_CONTEXT *ctx =
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(BSC_WEBSOCKET_CONTEXT *)lws_context_user(lws_get_context(wsi));
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int ret = 0;
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BSC_WEBSOCKET_SRV_DISPATCH dispatch_func;
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void *user_param;
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bool stop_worker;
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uint8_t err_code[2];
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uint16_t err;
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(void)user;
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DEBUG_PRINTF(
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"bws_srv_websocket_event() >>> ctx = %p, user_param = %p, "
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"proto = %d, wsi = %p, "
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"reason = %d, in = %p, len = %d\n",
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ctx, ctx->user_param, ctx->proto, wsi, reason, in, len);
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switch (reason) {
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case LWS_CALLBACK_ESTABLISHED: {
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pthread_mutex_lock(ctx->mutex);
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DEBUG_PRINTF("bws_srv_websocket_event() established connection\n");
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h = bws_srv_alloc_connection(ctx);
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if (h == BSC_WEBSOCKET_INVALID_HANDLE) {
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DEBUG_PRINTF("bws_srv_websocket_event() no free sockets, "
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"dropping incoming connection\n");
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pthread_mutex_unlock(ctx->mutex);
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return -1;
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}
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DEBUG_PRINTF(
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"bws_srv_websocket_event() ctx %p proto %d set state of"
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" socket %d to BACNET_WEBSOCKET_STATE_CONNECTING\n",
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ctx, ctx->proto, h);
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ctx->conn[h].ws = wsi;
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ctx->conn[h].state = BSC_WEBSOCKET_STATE_CONNECTED;
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ctx->conn[h].err_code = ERROR_CODE_SUCCESS;
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dispatch_func = ctx->dispatch_func;
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user_param = ctx->user_param;
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pthread_mutex_unlock(ctx->mutex);
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dispatch_func(
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(BSC_WEBSOCKET_SRV_HANDLE)ctx, h, BSC_WEBSOCKET_CONNECTED, 0,
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NULL, NULL, 0, user_param);
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/* wakeup worker to process pending event */
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lws_cancel_service(ctx->wsctx);
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break;
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}
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case LWS_CALLBACK_CLOSED: {
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DEBUG_PRINTF("bws_srv_websocket_event() closed connection\n");
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pthread_mutex_lock(ctx->mutex);
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h = bws_find_connnection(ctx, wsi);
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if (h == BSC_WEBSOCKET_INVALID_HANDLE) {
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pthread_mutex_unlock(ctx->mutex);
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} else {
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DEBUG_PRINTF(
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"bws_srv_websocket_event() ctx %p user_param = %p "
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"proto %d state of "
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"socket %d is %d\n",
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ctx, ctx->user_param, ctx->proto, h, ctx->conn[h].state);
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dispatch_func = ctx->dispatch_func;
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user_param = ctx->user_param;
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stop_worker = ctx->stop_worker;
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err = ctx->conn[h].err_code;
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bws_srv_free_connection(ctx, h);
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pthread_mutex_unlock(ctx->mutex);
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if (!stop_worker) {
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dispatch_func(
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(BSC_WEBSOCKET_SRV_HANDLE)ctx, h,
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BSC_WEBSOCKET_DISCONNECTED, err, NULL, NULL, 0,
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user_param);
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}
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}
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break;
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}
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case LWS_CALLBACK_WS_PEER_INITIATED_CLOSE: {
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pthread_mutex_lock(ctx->mutex);
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h = bws_find_connnection(ctx, wsi);
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if (h != BSC_WEBSOCKET_INVALID_HANDLE && len >= 2) {
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err_code[0] = ((uint8_t *)in)[1];
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err_code[1] = ((uint8_t *)in)[0];
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bws_set_disconnect_reason(ctx, h, *((uint16_t *)&err_code));
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}
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pthread_mutex_unlock(ctx->mutex);
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break;
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}
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case LWS_CALLBACK_RECEIVE: {
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pthread_mutex_lock(ctx->mutex);
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h = bws_find_connnection(ctx, wsi);
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if (h == BSC_WEBSOCKET_INVALID_HANDLE) {
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pthread_mutex_unlock(ctx->mutex);
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} else {
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DEBUG_PRINTF(
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"bws_srv_websocket_event() ctx %p proto %d "
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"received %d bytes of "
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"data for websocket %d\n",
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ctx, ctx->proto, len, h);
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if (!lws_frame_is_binary(wsi)) {
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/* According AB.7.5.3 BACnet/SC BVLC Message Exchange,
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if a received data frame is not binary,
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the WebSocket connection shall be closed with a
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status code of 1003 -WEBSOCKET_DATA_NOT_ACCEPTED.
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*/
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DEBUG_PRINTF(
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"bws_srv_websocket_event() ctx %p proto %d got "
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"non-binary frame, "
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"close websocket %d\n",
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ctx, ctx->proto, h);
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lws_close_reason(
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wsi, LWS_CLOSE_STATUS_UNACCEPTABLE_OPCODE, NULL, 0);
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pthread_mutex_unlock(ctx->mutex);
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DEBUG_PRINTF("bws_srv_websocket_event() <<< ret = -1\n");
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return -1;
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}
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if (ctx->conn[h].state != BSC_WEBSOCKET_STATE_CONNECTED) {
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pthread_mutex_unlock(ctx->mutex);
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} else {
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if (!ctx->conn[h].fragment_buffer) {
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ctx->conn[h].fragment_buffer =
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malloc(BSC_RX_BUFFER_LEN);
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if (!ctx->conn[h].fragment_buffer) {
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lws_close_reason(
|
|
wsi, LWS_CLOSE_STATUS_MESSAGE_TOO_LARGE, NULL,
|
|
0);
|
|
pthread_mutex_unlock(ctx->mutex);
|
|
DEBUG_PRINTF(
|
|
"bws_srv_websocket_event() <<< ret = "
|
|
"-1, allocation of %d bytes failed\n",
|
|
len <= BSC_RX_BUFFER_LEN ? BSC_RX_BUFFER_LEN
|
|
: len);
|
|
return -1;
|
|
}
|
|
ctx->conn[h].fragment_buffer_len = 0;
|
|
ctx->conn[h].fragment_buffer_size = BSC_RX_BUFFER_LEN;
|
|
}
|
|
if (ctx->conn[h].fragment_buffer_len + len >
|
|
ctx->conn[h].fragment_buffer_size) {
|
|
DEBUG_PRINTF(
|
|
"bws_srv_websocket_event() realloc buf of %d bytes"
|
|
"for socket %d to %d bytes\n",
|
|
ctx->conn[h].fragment_buffer_len, h,
|
|
ctx->conn[h].fragment_buffer_len + len);
|
|
|
|
ctx->conn[h].fragment_buffer = realloc(
|
|
ctx->conn[h].fragment_buffer,
|
|
ctx->conn[h].fragment_buffer_len + len);
|
|
if (!ctx->conn[h].fragment_buffer) {
|
|
lws_close_reason(
|
|
wsi, LWS_CLOSE_STATUS_MESSAGE_TOO_LARGE, NULL,
|
|
0);
|
|
pthread_mutex_unlock(ctx->mutex);
|
|
DEBUG_PRINTF(
|
|
"bws_srv_websocket_event() <<< ret = -1, "
|
|
"re-allocation of %d bytes failed\n",
|
|
ctx->conn[h].fragment_buffer_len + len);
|
|
return -1;
|
|
}
|
|
ctx->conn[h].fragment_buffer_size =
|
|
ctx->conn[h].fragment_buffer_len + len;
|
|
}
|
|
DEBUG_PRINTF(
|
|
"bws_srv_websocket_event() got next %d bytes for "
|
|
"socket %d total_len %d\n",
|
|
len, h, ctx->conn[h].fragment_buffer_len);
|
|
memcpy(
|
|
&ctx->conn[h]
|
|
.fragment_buffer[ctx->conn[h].fragment_buffer_len],
|
|
in, len);
|
|
ctx->conn[h].fragment_buffer_len += len;
|
|
if (lws_is_final_fragment(wsi) && !ctx->stop_worker) {
|
|
dispatch_func = ctx->dispatch_func;
|
|
user_param = ctx->user_param;
|
|
pthread_mutex_unlock(ctx->mutex);
|
|
dispatch_func(
|
|
(BSC_WEBSOCKET_SRV_HANDLE)ctx, h,
|
|
BSC_WEBSOCKET_RECEIVED, 0, NULL,
|
|
ctx->conn[h].fragment_buffer,
|
|
ctx->conn[h].fragment_buffer_len, user_param);
|
|
pthread_mutex_lock(ctx->mutex);
|
|
ctx->conn[h].fragment_buffer_len = 0;
|
|
pthread_mutex_unlock(ctx->mutex);
|
|
} else {
|
|
pthread_mutex_unlock(ctx->mutex);
|
|
}
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
case LWS_CALLBACK_SERVER_WRITEABLE: {
|
|
pthread_mutex_lock(ctx->mutex);
|
|
DEBUG_PRINTF(
|
|
"bws_srv_websocket_event() ctx %p proto %d can write\n", ctx,
|
|
ctx->proto);
|
|
h = bws_find_connnection(ctx, wsi);
|
|
if (h == BSC_WEBSOCKET_INVALID_HANDLE) {
|
|
pthread_mutex_unlock(ctx->mutex);
|
|
} else {
|
|
DEBUG_PRINTF(
|
|
"bws_srv_websocket_event() ctx %p proto %d socket "
|
|
"%d state = %d\n",
|
|
ctx, ctx->proto, h, ctx->conn[h].state);
|
|
|
|
if (ctx->conn[h].state == BSC_WEBSOCKET_STATE_DISCONNECTING) {
|
|
/* if -1 returned from this callback libwebsocket closes
|
|
+ websocket related to wsi */
|
|
ret = -1;
|
|
}
|
|
|
|
if ((ctx->conn[h].state != BSC_WEBSOCKET_STATE_IDLE) &&
|
|
!ctx->stop_worker && ctx->conn[h].want_send_data) {
|
|
ctx->conn[h].can_send_data = true;
|
|
dispatch_func = ctx->dispatch_func;
|
|
user_param = ctx->user_param;
|
|
stop_worker = ctx->stop_worker;
|
|
pthread_mutex_unlock(ctx->mutex);
|
|
if (!stop_worker) {
|
|
dispatch_func(
|
|
(BSC_WEBSOCKET_SRV_HANDLE)ctx, h,
|
|
BSC_WEBSOCKET_SENDABLE, 0, NULL, NULL, 0,
|
|
user_param);
|
|
}
|
|
pthread_mutex_lock(ctx->mutex);
|
|
ctx->conn[h].want_send_data = false;
|
|
ctx->conn[h].can_send_data = false;
|
|
pthread_mutex_unlock(ctx->mutex);
|
|
/* wakeup worker to process internal state */
|
|
lws_cancel_service(ctx->wsctx);
|
|
} else {
|
|
ctx->conn[h].want_send_data = false;
|
|
pthread_mutex_unlock(ctx->mutex);
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
default: {
|
|
break;
|
|
}
|
|
}
|
|
DEBUG_PRINTF("bws_srv_websocket_event() <<< ret = %d\n", ret);
|
|
return ret;
|
|
}
|
|
|
|
static void *bws_srv_worker(void *arg)
|
|
{
|
|
BSC_WEBSOCKET_CONTEXT *ctx = (BSC_WEBSOCKET_CONTEXT *)arg;
|
|
int i;
|
|
BSC_WEBSOCKET_SRV_DISPATCH dispatch_func;
|
|
void *user_param;
|
|
|
|
DEBUG_PRINTF(
|
|
"bws_srv_worker() started for ctx %p proto %d user_param %p\n", ctx,
|
|
ctx->proto, ctx->user_param);
|
|
|
|
pthread_mutex_lock(ctx->mutex);
|
|
dispatch_func = ctx->dispatch_func;
|
|
user_param = ctx->user_param;
|
|
pthread_mutex_unlock(ctx->mutex);
|
|
|
|
dispatch_func(
|
|
(BSC_WEBSOCKET_SRV_HANDLE)ctx, 0, BSC_WEBSOCKET_SERVER_STARTED, 0, NULL,
|
|
NULL, 0, user_param);
|
|
|
|
while (1) {
|
|
DEBUG_PRINTF(
|
|
"bws_srv_worker() ctx %p proto %d blocked user_param %p\n", ctx,
|
|
ctx->proto, ctx->user_param);
|
|
pthread_mutex_lock(ctx->mutex);
|
|
|
|
if (ctx->stop_worker) {
|
|
DEBUG_PRINTF(
|
|
"bws_srv_worker() ctx %p user_param %p proto %d going "
|
|
"to stop\n",
|
|
ctx, ctx->user_param, ctx->proto);
|
|
DEBUG_PRINTF(
|
|
"bws_srv_worker() destroy wsctx %p, ctx = %p, "
|
|
"user_param = %p\n",
|
|
ctx->wsctx, ctx, ctx->user_param);
|
|
/* TRICKY: Libwebsockets API is not designed to be used from
|
|
multipe service threads, as a result
|
|
lws_context_destroy() is not thread safe. More over, on different
|
|
platforms the function behaves in different ways. Call of
|
|
lws_context_destroy() leads to several calls of
|
|
bws_srv_websocket_event() callback (LWS_CALLBACK_CLOSED,
|
|
etc..). But under some OS (MacOSx) that callback is
|
|
called from context of the bws_cli_worker() thread and
|
|
under some other OS (linux) the callback is called from
|
|
internal libwebsockets lib thread. That's why
|
|
bws_cli_mutex must be unlocked before
|
|
lws_context_destroy() call. To ensure that nobody calls
|
|
lws_context_destroy() from some parallel thread it is
|
|
protected by global websocket mutex.
|
|
*/
|
|
pthread_mutex_unlock(ctx->mutex);
|
|
bsc_websocket_global_lock();
|
|
lws_context_destroy(ctx->wsctx);
|
|
bsc_websocket_global_unlock();
|
|
pthread_mutex_lock(ctx->mutex);
|
|
ctx->wsctx = NULL;
|
|
DEBUG_PRINTF("bws_srv_worker() set wsctx %p\n", ctx->wsctx);
|
|
ctx->stop_worker = false;
|
|
DEBUG_PRINTF(
|
|
"bws_srv_worker() ctx %p proto %d emitting stop event\n", ctx,
|
|
ctx->proto);
|
|
dispatch_func = ctx->dispatch_func;
|
|
user_param = ctx->user_param;
|
|
DEBUG_PRINTF(
|
|
"bws_srv_worker() ctx %p user_param = %p\n", ctx, user_param);
|
|
pthread_mutex_unlock(ctx->mutex);
|
|
dispatch_func(
|
|
ctx, 0, BSC_WEBSOCKET_SERVER_STOPPED, 0, NULL, NULL, 0,
|
|
user_param);
|
|
bws_free_server_ctx(ctx);
|
|
DEBUG_PRINTF(
|
|
"bws_srv_worker() ctx %p proto %d stopped\n", ctx, ctx->proto);
|
|
return NULL;
|
|
}
|
|
|
|
for (i = 0; i < bws_srv_get_max_sockets(ctx->proto); i++) {
|
|
DEBUG_PRINTF(
|
|
"bws_srv_worker() ctx %p user_param %p proto %d "
|
|
"socket %d(%p) state = %d\n",
|
|
ctx, ctx->user_param, ctx->proto, i, &ctx->conn[i],
|
|
ctx->conn[i].state);
|
|
if (ctx->conn[i].state == BSC_WEBSOCKET_STATE_CONNECTED) {
|
|
if (ctx->conn[i].want_send_data) {
|
|
DEBUG_PRINTF(
|
|
"bws_srv_worker() process request for sending "
|
|
"data on socket %d\n",
|
|
i);
|
|
lws_callback_on_writable(ctx->conn[i].ws);
|
|
}
|
|
} else if (
|
|
ctx->conn[i].state == BSC_WEBSOCKET_STATE_DISCONNECTING) {
|
|
DEBUG_PRINTF(
|
|
"bws_srv_worker() process disconnecting event on "
|
|
"socket %d\n",
|
|
i);
|
|
lws_callback_on_writable(ctx->conn[i].ws);
|
|
}
|
|
}
|
|
|
|
DEBUG_PRINTF(
|
|
"bws_srv_worker() ctx %p proto %d unblocked\n", ctx, ctx->proto);
|
|
pthread_mutex_unlock(ctx->mutex);
|
|
|
|
DEBUG_PRINTF(
|
|
"bws_srv_worker() ctx %p user_param %p proto %d going to block on "
|
|
"lws_service() call\n",
|
|
ctx, ctx->user_param, ctx->proto);
|
|
lws_service(ctx->wsctx, 0);
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
BSC_WEBSOCKET_RET bws_srv_start(
|
|
BSC_WEBSOCKET_PROTOCOL proto,
|
|
int port,
|
|
char *iface,
|
|
uint8_t *ca_cert,
|
|
size_t ca_cert_size,
|
|
uint8_t *cert,
|
|
size_t cert_size,
|
|
uint8_t *key,
|
|
size_t key_size,
|
|
size_t timeout_s,
|
|
BSC_WEBSOCKET_SRV_DISPATCH dispatch_func,
|
|
void *dispatch_func_user_param,
|
|
BSC_WEBSOCKET_SRV_HANDLE *sh)
|
|
{
|
|
pthread_t thread_id;
|
|
struct lws_context_creation_info info = { 0 };
|
|
BSC_WEBSOCKET_CONTEXT *ctx;
|
|
pthread_attr_t attr;
|
|
int r;
|
|
struct lws_protocols protos[] = { { (proto == BSC_WEBSOCKET_HUB_PROTOCOL)
|
|
? BSC_WEBSOCKET_HUB_PROTOCOL_STR
|
|
: BSC_WEBSOCKET_DIRECT_PROTOCOL_STR,
|
|
bws_srv_websocket_event, 0, 0, 0, NULL,
|
|
0 },
|
|
LWS_PROTOCOL_LIST_TERM };
|
|
|
|
DEBUG_PRINTF(
|
|
"bws_srv_start() >>> proto = %d port = %d "
|
|
"dispatch_func_user_param = %p\n",
|
|
proto, port, dispatch_func_user_param);
|
|
|
|
if (proto != BSC_WEBSOCKET_HUB_PROTOCOL &&
|
|
proto != BSC_WEBSOCKET_DIRECT_PROTOCOL) {
|
|
DEBUG_PRINTF("bws_srv_start() <<< bad protocol, ret = "
|
|
"BSC_WEBSOCKET_BAD_PARAM\n");
|
|
return BSC_WEBSOCKET_BAD_PARAM;
|
|
}
|
|
|
|
if (!ca_cert || !ca_cert_size || !cert || !cert_size || !key || !key_size ||
|
|
!dispatch_func || !timeout_s || !sh) {
|
|
DEBUG_PRINTF("bws_srv_start() <<< ret = BSC_WEBSOCKET_BAD_PARAM\n");
|
|
return BSC_WEBSOCKET_BAD_PARAM;
|
|
}
|
|
|
|
if (port < 0 || port > 65535) {
|
|
DEBUG_PRINTF("bws_srv_start() <<< ret = BSC_WEBSOCKET_BAD_PARAM\n");
|
|
return BSC_WEBSOCKET_BAD_PARAM;
|
|
}
|
|
|
|
ctx = bws_alloc_server_ctx(proto);
|
|
|
|
if (!ctx) {
|
|
DEBUG_PRINTF(
|
|
"bws_srv_start() <<< maximum amount of servers for "
|
|
"server proto %d is to small, ret = BSC_WEBSOCKET_NO_RESOURCES\n",
|
|
proto);
|
|
return BSC_WEBSOCKET_NO_RESOURCES;
|
|
}
|
|
|
|
bsc_websocket_init_log();
|
|
|
|
pthread_mutex_lock(ctx->mutex);
|
|
info.port = port;
|
|
info.iface = iface;
|
|
info.protocols = protos;
|
|
info.gid = -1;
|
|
info.uid = -1;
|
|
info.server_ssl_cert_mem = cert;
|
|
info.server_ssl_cert_mem_len = cert_size;
|
|
info.server_ssl_ca_mem = ca_cert;
|
|
info.server_ssl_ca_mem_len = ca_cert_size;
|
|
info.server_ssl_private_key_mem = key;
|
|
info.server_ssl_private_key_mem_len = key_size;
|
|
info.options |= LWS_SERVER_OPTION_DO_SSL_GLOBAL_INIT;
|
|
info.options |= LWS_SERVER_OPTION_FAIL_UPON_UNABLE_TO_BIND;
|
|
info.timeout_secs = timeout_s;
|
|
info.connect_timeout_secs = timeout_s;
|
|
info.user = ctx;
|
|
|
|
/* TRICKY: check comments related to lws_context_destroy() call */
|
|
|
|
pthread_mutex_unlock(ctx->mutex);
|
|
bsc_websocket_global_lock();
|
|
ctx->wsctx = lws_create_context(&info);
|
|
bsc_websocket_global_unlock();
|
|
pthread_mutex_lock(ctx->mutex);
|
|
|
|
if (!ctx->wsctx) {
|
|
pthread_mutex_unlock(ctx->mutex);
|
|
bws_free_server_ctx(ctx);
|
|
DEBUG_PRINTF("bws_srv_start() <<< ret = BSC_WEBSOCKET_NO_RESOURCES\n");
|
|
return BSC_WEBSOCKET_NO_RESOURCES;
|
|
}
|
|
|
|
ctx->dispatch_func = dispatch_func;
|
|
ctx->user_param = dispatch_func_user_param;
|
|
ctx->proto = proto;
|
|
r = pthread_attr_init(&attr);
|
|
|
|
if (!r) {
|
|
r = pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
|
|
}
|
|
|
|
if (!r) {
|
|
r = pthread_create(&thread_id, &attr, &bws_srv_worker, ctx);
|
|
}
|
|
|
|
if (r) {
|
|
/* TRICKY: Libwebsockets API is not designed to be used from
|
|
multipe service threads, as a result lws_context_destroy()
|
|
is not thread safe. More over, on different platforms the
|
|
function behaves in different ways. Call of
|
|
lws_context_destroy() leads to several calls of
|
|
bws_srv_websocket_event() callback (LWS_CALLBACK_CLOSED,
|
|
etc..). But under some OS (MacOSx) that callback is
|
|
called from context of the bws_cli_worker() thread and
|
|
under some other OS (linux) the callback is called from
|
|
internal libwebsockets lib thread. That's why
|
|
bws_cli_mutex must be unlocked before
|
|
lws_context_destroy() call. To ensure that nobody calls
|
|
lws_context_destroy() from some parallel thread it is
|
|
protected by global websocket mutex.
|
|
*/
|
|
pthread_mutex_unlock(ctx->mutex);
|
|
bsc_websocket_global_lock();
|
|
lws_context_destroy(ctx->wsctx);
|
|
bsc_websocket_global_unlock();
|
|
pthread_mutex_lock(ctx->mutex);
|
|
ctx->wsctx = NULL;
|
|
pthread_mutex_unlock(ctx->mutex);
|
|
bws_free_server_ctx(ctx);
|
|
DEBUG_PRINTF(
|
|
"bws_srv_start() <<< ret = BACNET_WEBSOCKET_NO_RESOURCES\n");
|
|
return BSC_WEBSOCKET_NO_RESOURCES;
|
|
}
|
|
pthread_attr_destroy(&attr);
|
|
pthread_mutex_unlock(ctx->mutex);
|
|
*sh = (BSC_WEBSOCKET_SRV_HANDLE)ctx;
|
|
DEBUG_PRINTF("bws_srv_start() <<< ret = BSC_WEBSOCKET_SUCCESS\n");
|
|
return BSC_WEBSOCKET_SUCCESS;
|
|
}
|
|
|
|
BSC_WEBSOCKET_RET bws_srv_stop(BSC_WEBSOCKET_SRV_HANDLE sh)
|
|
{
|
|
BSC_WEBSOCKET_CONTEXT *ctx = (BSC_WEBSOCKET_CONTEXT *)sh;
|
|
|
|
DEBUG_PRINTF(
|
|
"bws_srv_stop() >>> ctx = %p user_param = %p\n", ctx, ctx->user_param);
|
|
|
|
#if DEBUG_ENABLED == 1
|
|
if (!bws_validate_ctx_pointer(ctx)) {
|
|
DEBUG_PRINTF("bws_srv_stop() <<< bad websocket handle, ret = "
|
|
"BSC_WEBSOCKET_BAD_PARAM\n");
|
|
return BSC_WEBSOCKET_BAD_PARAM;
|
|
}
|
|
#endif
|
|
|
|
pthread_mutex_lock(ctx->mutex);
|
|
|
|
if (ctx->stop_worker) {
|
|
pthread_mutex_unlock(ctx->mutex);
|
|
DEBUG_PRINTF(
|
|
"bws_srv_stop() <<< ret = BSC_WEBSOCKET_INVALID_OPERATION\n");
|
|
return BSC_WEBSOCKET_INVALID_OPERATION;
|
|
}
|
|
|
|
ctx->stop_worker = true;
|
|
/* wake up libwebsockets runloop */
|
|
lws_cancel_service(ctx->wsctx);
|
|
pthread_mutex_unlock(ctx->mutex);
|
|
|
|
DEBUG_PRINTF("bws_srv_stop() <<< ret = BSC_WEBSOCKET_SUCCESS\n");
|
|
return BSC_WEBSOCKET_SUCCESS;
|
|
}
|
|
|
|
void bws_srv_disconnect(BSC_WEBSOCKET_SRV_HANDLE sh, BSC_WEBSOCKET_HANDLE h)
|
|
{
|
|
BSC_WEBSOCKET_CONTEXT *ctx = (BSC_WEBSOCKET_CONTEXT *)sh;
|
|
DEBUG_PRINTF("bws_srv_disconnect() >>> sh = %p h = %d\n", sh, h);
|
|
|
|
#if DEBUG_ENABLED == 1
|
|
if (!bws_validate_ctx_pointer(ctx)) {
|
|
DEBUG_PRINTF("bws_srv_disconnect() <<< bad websocket handle\n");
|
|
return;
|
|
}
|
|
#endif
|
|
|
|
pthread_mutex_lock(ctx->mutex);
|
|
if (h >= 0 && h < bws_srv_get_max_sockets(ctx->proto) &&
|
|
!ctx->stop_worker) {
|
|
if (ctx->conn[h].state == BSC_WEBSOCKET_STATE_CONNECTED) {
|
|
/* tell worker to process change of connection state */
|
|
ctx->conn[h].state = BSC_WEBSOCKET_STATE_DISCONNECTING;
|
|
lws_cancel_service(ctx->wsctx);
|
|
}
|
|
}
|
|
pthread_mutex_unlock(ctx->mutex);
|
|
DEBUG_PRINTF("bws_srv_disconnect() <<<\n");
|
|
}
|
|
|
|
void bws_srv_send(BSC_WEBSOCKET_SRV_HANDLE sh, BSC_WEBSOCKET_HANDLE h)
|
|
{
|
|
BSC_WEBSOCKET_CONTEXT *ctx = (BSC_WEBSOCKET_CONTEXT *)sh;
|
|
|
|
DEBUG_PRINTF("bws_srv_send() >>> ctx = %p h = %d\n", ctx, h);
|
|
|
|
#if DEBUG_ENABLED == 1
|
|
if (!bws_validate_ctx_pointer(ctx)) {
|
|
DEBUG_PRINTF("bws_srv_send() <<< bad websocket handle\n");
|
|
return;
|
|
}
|
|
#endif
|
|
|
|
pthread_mutex_lock(ctx->mutex);
|
|
if (ctx->conn[h].state == BSC_WEBSOCKET_STATE_CONNECTED) {
|
|
/* tell worker to process send request */
|
|
ctx->conn[h].want_send_data = true;
|
|
lws_cancel_service(ctx->wsctx);
|
|
}
|
|
pthread_mutex_unlock(ctx->mutex);
|
|
DEBUG_PRINTF("bws_srv_send() <<<\n");
|
|
}
|
|
|
|
BSC_WEBSOCKET_RET bws_srv_dispatch_send(
|
|
BSC_WEBSOCKET_SRV_HANDLE sh,
|
|
BSC_WEBSOCKET_HANDLE h,
|
|
uint8_t *payload,
|
|
size_t payload_size)
|
|
{
|
|
int written;
|
|
BSC_WEBSOCKET_RET ret;
|
|
BSC_WEBSOCKET_CONTEXT *ctx = (BSC_WEBSOCKET_CONTEXT *)sh;
|
|
|
|
DEBUG_PRINTF(
|
|
"bws_srv_dispatch_send() >>> ctx = %p h = %d payload %p "
|
|
"payload_size %d\n",
|
|
ctx, h, payload, payload_size);
|
|
|
|
#if DEBUG_ENABLED == 1
|
|
if (!bws_validate_ctx_pointer(ctx)) {
|
|
DEBUG_PRINTF("bws_srv_dispatch_send() <<< bad websocket handle, ret = "
|
|
"BSC_WEBSOCKET_BAD_PARAM\n");
|
|
return BSC_WEBSOCKET_BAD_PARAM;
|
|
}
|
|
#endif
|
|
|
|
if (h < 0 || h >= bws_srv_get_max_sockets(ctx->proto)) {
|
|
DEBUG_PRINTF("bws_srv_dispatch_send() <<< BSC_WEBSOCKET_BAD_PARAM\n");
|
|
return BSC_WEBSOCKET_BAD_PARAM;
|
|
}
|
|
|
|
if (!payload || !payload_size) {
|
|
DEBUG_PRINTF("bws_srv_dispatch_send() <<< BSC_WEBSOCKET_BAD_PARAM\n");
|
|
return BSC_WEBSOCKET_BAD_PARAM;
|
|
}
|
|
|
|
pthread_mutex_lock(ctx->mutex);
|
|
|
|
if (ctx->stop_worker) {
|
|
pthread_mutex_unlock(ctx->mutex);
|
|
DEBUG_PRINTF("bws_srv_dispatch_send() <<< ret = "
|
|
"BSC_WEBSOCKET_INVALID_OPERATION\n");
|
|
return BSC_WEBSOCKET_INVALID_OPERATION;
|
|
}
|
|
|
|
if ((ctx->conn[h].state != BSC_WEBSOCKET_STATE_CONNECTED) ||
|
|
!ctx->conn[h].want_send_data || !ctx->conn[h].can_send_data) {
|
|
DEBUG_PRINTF(
|
|
"bws_srv_dispatch_send() <<< ret = BACNET_WEBSOCKET_BAD_PARAM\n");
|
|
pthread_mutex_unlock(ctx->mutex);
|
|
return BSC_WEBSOCKET_INVALID_OPERATION;
|
|
}
|
|
|
|
written =
|
|
lws_write(ctx->conn[h].ws, payload, payload_size, LWS_WRITE_BINARY);
|
|
|
|
DEBUG_PRINTF("bws_srv_dispatch_send() %d bytes is sent\n", written);
|
|
|
|
if (written < (int)payload_size) {
|
|
DEBUG_PRINTF(
|
|
"bws_srv_dispatch_send() websocket connection is broken(closed)\n");
|
|
/* tell worker to process change of connection state */
|
|
ctx->conn[h].state = BSC_WEBSOCKET_STATE_DISCONNECTING;
|
|
lws_cancel_service(ctx->wsctx);
|
|
ret = BSC_WEBSOCKET_INVALID_OPERATION;
|
|
} else {
|
|
ret = BSC_WEBSOCKET_SUCCESS;
|
|
}
|
|
|
|
pthread_mutex_unlock(ctx->mutex);
|
|
DEBUG_PRINTF("bws_srv_dispatch_send() <<< ret = %d\n", ret);
|
|
return ret;
|
|
}
|
|
|
|
bool bws_srv_get_peer_ip_addr(
|
|
BSC_WEBSOCKET_SRV_HANDLE sh,
|
|
BSC_WEBSOCKET_HANDLE h,
|
|
uint8_t *ip_str,
|
|
size_t ip_str_len,
|
|
uint16_t *port)
|
|
{
|
|
BSC_WEBSOCKET_CONTEXT *ctx = (BSC_WEBSOCKET_CONTEXT *)sh;
|
|
int fd;
|
|
struct sockaddr_storage addr;
|
|
socklen_t len;
|
|
const char *ret = NULL;
|
|
|
|
if (!ctx || h < 0 || !ip_str || !ip_str_len || !port ||
|
|
h >= bws_srv_get_max_sockets(ctx->proto)) {
|
|
return false;
|
|
}
|
|
|
|
pthread_mutex_lock(ctx->mutex);
|
|
|
|
if (ctx->conn[h].state != BSC_WEBSOCKET_STATE_IDLE &&
|
|
ctx->conn[h].ws != NULL && !ctx->stop_worker) {
|
|
len = sizeof(addr);
|
|
fd = lws_get_socket_fd(ctx->conn[h].ws);
|
|
if (fd != -1) {
|
|
getpeername(fd, (struct sockaddr *)&addr, &len);
|
|
if (addr.ss_family == AF_INET) {
|
|
struct sockaddr_in *s = (struct sockaddr_in *)&addr;
|
|
*port = ntohs(s->sin_port);
|
|
ret = inet_ntop(
|
|
AF_INET, &s->sin_addr, (char *)ip_str, ip_str_len);
|
|
} else {
|
|
struct sockaddr_in6 *s = (struct sockaddr_in6 *)&addr;
|
|
*port = ntohs(s->sin6_port);
|
|
ret = inet_ntop(
|
|
AF_INET6, &s->sin6_addr, (char *)ip_str, ip_str_len);
|
|
}
|
|
}
|
|
}
|
|
|
|
pthread_mutex_unlock(ctx->mutex);
|
|
|
|
if (ret) {
|
|
return true;
|
|
}
|
|
|
|
return false;
|
|
}
|