103 lines
2.5 KiB
C
103 lines
2.5 KiB
C
/*
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Copyright (c) 2009-2020 Roger Light <roger@atchoo.org>
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All rights reserved. This program and the accompanying materials
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are made available under the terms of the Eclipse Public License 2.0
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and Eclipse Distribution License v1.0 which accompany this distribution.
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The Eclipse Public License is available at
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https://www.eclipse.org/legal/epl-2.0/
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and the Eclipse Distribution License is available at
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http://www.eclipse.org/org/documents/edl-v10.php.
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SPDX-License-Identifier: EPL-2.0 OR BSD-3-Clause
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Contributors:
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Roger Light - initial implementation and documentation.
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*/
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#include "config.h"
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#include <assert.h>
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#include <string.h>
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#ifdef WITH_BROKER
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# include "mosquitto_broker_internal.h"
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#endif
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#include "mosquitto.h"
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#include "logging_mosq.h"
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#include "memory_mosq.h"
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#include "mqtt_protocol.h"
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#include "packet_mosq.h"
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#include "property_mosq.h"
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#include "send_mosq.h"
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#include "util_mosq.h"
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int send__unsubscribe(struct mosquitto *mosq, int *mid, int topic_count, char *const *const topic, const mosquitto_property *properties)
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{
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struct mosquitto__packet *packet = NULL;
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uint32_t packetlen;
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uint16_t local_mid;
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int rc;
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int i;
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size_t tlen;
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assert(mosq);
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assert(topic);
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packetlen = 2;
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for(i=0; i<topic_count; i++){
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tlen = strlen(topic[i]);
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if(tlen > UINT16_MAX){
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return MOSQ_ERR_INVAL;
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}
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packetlen += 2U+(uint16_t)tlen;
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}
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packet = mosquitto__calloc(1, sizeof(struct mosquitto__packet));
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if(!packet) return MOSQ_ERR_NOMEM;
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if(mosq->protocol == mosq_p_mqtt5){
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packetlen += property__get_remaining_length(properties);
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}
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packet->command = CMD_UNSUBSCRIBE | (1<<1);
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packet->remaining_length = packetlen;
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rc = packet__alloc(packet);
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if(rc){
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mosquitto__free(packet);
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return rc;
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}
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/* Variable header */
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local_mid = mosquitto__mid_generate(mosq);
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if(mid) *mid = (int)local_mid;
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packet__write_uint16(packet, local_mid);
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if(mosq->protocol == mosq_p_mqtt5){
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/* We don't use User Property yet. */
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property__write_all(packet, properties, true);
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}
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/* Payload */
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for(i=0; i<topic_count; i++){
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packet__write_string(packet, topic[i], (uint16_t)strlen(topic[i]));
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}
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#ifdef WITH_BROKER
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# ifdef WITH_BRIDGE
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for(i=0; i<topic_count; i++){
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log__printf(mosq, MOSQ_LOG_DEBUG, "Bridge %s sending UNSUBSCRIBE (Mid: %d, Topic: %s)", mosq->id, local_mid, topic[i]);
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}
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# endif
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#else
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for(i=0; i<topic_count; i++){
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log__printf(mosq, MOSQ_LOG_DEBUG, "Client %s sending UNSUBSCRIBE (Mid: %d, Topic: %s)", mosq->id, local_mid, topic[i]);
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}
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#endif
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return packet__queue(mosq, packet);
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}
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