/***************************************************************************
 * 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                                                 */
/**                                                                       */
/**    Transport Layer Security (TLS)                                     */
/**                                                                       */
/**************************************************************************/
/**************************************************************************/

#define NX_SECURE_SOURCE_CODE


#include "nx_secure_tls.h"

/**************************************************************************/
/*                                                                        */
/*  FUNCTION                                               RELEASE        */
/*                                                                        */
/*    _nx_secure_tls_send_alert                           PORTABLE C      */
/*                                                           6.4.3        */
/*  AUTHOR                                                                */
/*                                                                        */
/*    Timothy Stapko, Microsoft Corporation                               */
/*                                                                        */
/*  DESCRIPTION                                                           */
/*                                                                        */
/*    This function populates an NX_PACKET with a TLS Alert message,      */
/*    which indicates an error (and possible security breach) has been    */
/*    detected. The alert notifies the remote host of the error.          */
/*                                                                        */
/*  INPUT                                                                 */
/*                                                                        */
/*    tls_session                           TLS control block             */
/*    send_packet                           Packet to be filled           */
/*    alert_number                          TLS alert number              */
/*    alert_level                           TLS alert severity            */
/*                                                                        */
/*  OUTPUT                                                                */
/*                                                                        */
/*    None                                                                */
/*                                                                        */
/*  CALLS                                                                 */
/*                                                                        */
/*    None                                                                */
/*                                                                        */
/*  CALLED BY                                                             */
/*                                                                        */
/*    _nx_secure_dtls_client_handshake      DTLS client state machine     */
/*    _nx_secure_dtls_server_handshake      DTLS server state machine     */
/*    _nx_secure_dtls_session_end           End of a session              */
/*    _nx_secure_dtls_session_receive       Receive DTLS data             */
/*    _nx_secure_tls_client_handshake       TLS client state machine      */
/*    _nx_secure_tls_server_handshake       TLS server state machine      */
/*    _nx_secure_tls_session_end            End of a session              */
/*    _nx_secure_tls_session_receive_records                              */
/*                                          Receive TLS records           */
/*                                                                        */
/**************************************************************************/
VOID _nx_secure_tls_send_alert(NX_SECURE_TLS_SESSION *tls_session, NX_PACKET *send_packet,
                               UCHAR alert_number, UCHAR alert_level)
{

#ifndef NX_SECURE_TLS_CLIENT_DISABLED
    if (tls_session -> nx_secure_tls_socket_type == NX_SECURE_TLS_SESSION_TYPE_CLIENT)
    {
        tls_session -> nx_secure_tls_client_state = NX_SECURE_TLS_CLIENT_STATE_ALERT_SENT;
    }
#endif

#ifndef NX_SECURE_TLS_SERVER_DISABLED
    if (tls_session -> nx_secure_tls_socket_type == NX_SECURE_TLS_SESSION_TYPE_SERVER)
    {
        tls_session -> nx_secure_tls_server_state = NX_SECURE_TLS_SERVER_STATE_ALERT_SENT;
    }
#endif
    /* Populate the buffer with the alert level and alert number to send to the remote host. */
    send_packet -> nx_packet_append_ptr[0] = alert_level;
    send_packet -> nx_packet_append_ptr[1] = alert_number;

    /* Make sure the caller has the right length of data to send. */
    send_packet -> nx_packet_append_ptr = send_packet -> nx_packet_append_ptr + 2;
    send_packet -> nx_packet_length = 2;
}