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/***************************************************************************
* Copyright (c) 2024 Microsoft Corporation
* Copyright (c) 2025-present Eclipse ThreadX Contributors
*
* This program and the accompanying materials are made available under the
* terms of the MIT License which is available at
* https://opensource.org/licenses/MIT.
*
* SPDX-License-Identifier: MIT
**************************************************************************/
/**************************************************************************/
/**************************************************************************/
/** */
/** NetX Secure Component */
/** */
/** Datagram Transport Layer Security (DTLS) */
/** */
/**************************************************************************/
/**************************************************************************/
#define NX_SECURE_SOURCE_CODE
#include "nx_secure_dtls.h"
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _nx_secure_dtls_session_end PORTABLE C */
/* 6.4.3 */
/* AUTHOR */
/* */
/* Timothy Stapko, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function ends an active DTLS session by sending the DTLS */
/* CloseNotify alert to the remote host, then waiting for the response */
/* CloseNotify before returning. */
/* */
/* INPUT */
/* */
/* dtls_session DTLS session control block */
/* wait_option Indicates how long the caller */
/* should wait for the response */
/* */
/* OUTPUT */
/* */
/* status Completion status */
/* */
/* CALLS */
/* */
/* _nx_secure_dtls_packet_allocate Allocate internal DTLS packet */
/* _nx_secure_tls_send_alert Generate the CloseNotify */
/* _nx_secure_dtls_send_record Send the CloseNotify */
/* _nx_secure_dtls_session_reset Clear out the session */
/* _nx_secure_dtls_session_receive Receive DTLS data */
/* nx_secure_tls_packet_release Release packet */
/* tx_mutex_get Get protection mutex */
/* tx_mutex_put Put protection mutex */
/* */
/* CALLED BY */
/* */
/* Application Code */
/* */
/**************************************************************************/
UINT _nx_secure_dtls_session_end(NX_SECURE_DTLS_SESSION *dtls_session, UINT wait_option)
{
#ifdef NX_SECURE_ENABLE_DTLS
UINT status;
UINT error_status;
NX_PACKET *send_packet;
NX_PACKET *incoming_packet;
NX_PACKET *tmp_ptr;
NX_SECURE_TLS_SESSION *tls_session;
/* Get reference to internal TLS state. */
tls_session = &dtls_session -> nx_secure_dtls_tls_session;
/* Get the protection. */
tx_mutex_get(&_nx_secure_tls_protection, TX_WAIT_FOREVER);
/* Release packets in queue. */
while (tls_session -> nx_secure_record_queue_header)
{
tmp_ptr = tls_session -> nx_secure_record_queue_header;
tls_session -> nx_secure_record_queue_header = tmp_ptr -> nx_packet_queue_next;
tmp_ptr -> nx_packet_queue_next = NX_NULL;
nx_secure_tls_packet_release(tmp_ptr);
}
if (tls_session -> nx_secure_record_decrypted_packet)
{
nx_secure_tls_packet_release(tls_session -> nx_secure_record_decrypted_packet);
tls_session -> nx_secure_record_decrypted_packet = NX_NULL;
}
/* If the remote session is already finished, don't try to send. */
if(!dtls_session -> nx_secure_dtls_tls_session.nx_secure_tls_remote_session_active)
{
/* Reset the TLS state so this socket can be reused. */
tx_mutex_put(&_nx_secure_tls_protection);
status = _nx_secure_dtls_session_reset(dtls_session);
return(status);
}
/* Release the protection before suspending on nx_packet_allocate. */
tx_mutex_put(&_nx_secure_tls_protection);
/* Allocate a packet for our close-notify alert. */
status = _nx_secure_dtls_packet_allocate(dtls_session, tls_session -> nx_secure_tls_packet_pool, &send_packet, wait_option);
/* Check for errors in allocating packet. */
if (status != NX_SUCCESS)
{
_nx_secure_dtls_session_reset(dtls_session);
return(status);
}
/* Get the protection after nx_packet_allocate. */
tx_mutex_get(&_nx_secure_tls_protection, TX_WAIT_FOREVER);
/* A close-notify alert shuts down the TLS session cleanly. */
_nx_secure_tls_send_alert(tls_session, send_packet, NX_SECURE_TLS_ALERT_CLOSE_NOTIFY, NX_SECURE_TLS_ALERT_LEVEL_WARNING);
/* Finally, send the alert record to the remote host. */
status = _nx_secure_dtls_send_record(dtls_session, send_packet, NX_SECURE_TLS_ALERT, wait_option);
if (status)
{
/* Failed to send, release the packet. */
nx_secure_tls_packet_release(send_packet);
_nx_secure_dtls_session_reset(dtls_session);
tx_mutex_put(&_nx_secure_tls_protection);
return(status);
}
/* Release the protection. */
tx_mutex_put(&_nx_secure_tls_protection);
/* See if we received the CloseNotify, or if we need to wait. */
if(tls_session -> nx_secure_tls_received_alert_level != NX_SECURE_TLS_ALERT_LEVEL_WARNING ||
tls_session -> nx_secure_tls_received_alert_value != NX_SECURE_TLS_ALERT_CLOSE_NOTIFY)
{
while (status == NX_SUCCESS)
{
/* Wait for the CloseNotify response. */
status = _nx_secure_dtls_session_receive(dtls_session, &incoming_packet, wait_option);
if (status == NX_SUCCESS)
{
/* Release the packet. */
nx_secure_tls_packet_release(incoming_packet);
}
}
}
/* Save error status for return below. */
error_status = status;
/* Reset the TLS state so this socket can be reused. */
status = _nx_secure_dtls_session_reset(dtls_session);
if(error_status != NX_SECURE_TLS_ALERT_RECEIVED && error_status != NX_SECURE_TLS_CLOSE_NOTIFY_RECEIVED)
{
status = error_status;
}
return(status);
#else
NX_PARAMETER_NOT_USED(dtls_session);
NX_PARAMETER_NOT_USED(wait_option);
return(NX_NOT_SUPPORTED);
#endif /* NX_SECURE_ENABLE_DTLS */
}
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