/*

Copyright (c) 2009-2021 Roger Light <roger@atchoo.org>

All rights reserved. This program and the accompanying materials

are made available under the terms of the Eclipse Public License 2.0

and Eclipse Distribution License v1.0 which accompany this distribution.

The Eclipse Public License is available at

   https://www.eclipse.org/legal/epl-2.0/

and the Eclipse Distribution License is available at

  http://www.eclipse.org/org/documents/edl-v10.php.

SPDX-License-Identifier: EPL-2.0 OR BSD-3-Clause

Contributors:

   Roger Light - initial implementation and documentation.

*/

#include "config.h"

#include <assert.h>

#ifdef WITH_BROKER

#  include "mosquitto_broker_internal.h"

#  include "sys_tree.h"

#endif

#include "mosquitto.h"

#include "mosquitto_internal.h"

#include "logging_mosq.h"

#include "mosquitto/mqtt_protocol.h"

#include "packet_mosq.h"

#include "property_mosq.h"

#include "send_mosq.h"

int send__disconnect(struct mosquitto *mosq, uint8_t reason_code, const mosquitto_property *properties)

{

  struct mosquitto__packet *packet = NULL;

  int rc;

  uint32_t remaining_length;

  assert(mosq);

#ifdef WITH_BROKER

#  ifdef WITH_BRIDGE

  if(mosq->bridge){

    log__printf(mosq, MOSQ_LOG_DEBUG, "Bridge %s sending DISCONNECT", SAFE_PRINT(mosq->id));

  }else

#  else

  {

    log__printf(mosq, MOSQ_LOG_DEBUG, "Sending DISCONNECT to %s (rc%d)", SAFE_PRINT(mosq->id), reason_code);

  }

#  endif

#else

  log__printf(mosq, MOSQ_LOG_DEBUG, "Client %s sending DISCONNECT", SAFE_PRINT(mosq->id));

#endif

  assert(mosq);

  if(mosq->protocol == mosq_p_mqtt5 && (reason_code != 0 || properties)){

    remaining_length = 1;

    if(properties){

      remaining_length += mosquitto_property_get_remaining_length(properties);

    }

  }else{

    remaining_length = 0;

  }

  rc = packet__alloc(&packet, CMD_DISCONNECT, remaining_length);

  if(rc){

    mosquitto_FREE(packet);

    return rc;

  }

  if(mosq->protocol == mosq_p_mqtt5 && (reason_code != 0 || properties)){

    packet__write_byte(packet, reason_code);

    if(properties){

      property__write_all(packet, properties, true);

    }

  }

#ifdef WITH_BROKER

  metrics__int_inc(mosq_counter_mqtt_disconnect_sent, 1);

#endif

  return packet__queue(mosq, packet);

}