/*
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Copyright (c) 2009-2019 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 v1.0
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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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http://www.eclipse.org/legal/epl-v10.html
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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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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 <stdio.h>
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#include <string.h>
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#include "mosquitto_broker_internal.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 "send_mosq.h"
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int handle__unsubscribe(struct mosquitto_db *db, struct mosquitto *context)
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{
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uint16_t mid;
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char *sub;
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int slen;
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int rc;
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uint8_t reason;
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int reason_code_count = 0;
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int reason_code_max;
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uint8_t *reason_codes = NULL, *reason_tmp;
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mosquitto_property *properties = NULL;
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if(!context) return MOSQ_ERR_INVAL;
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if(context->state != mosq_cs_connected){
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return MOSQ_ERR_PROTOCOL;
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}
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log__printf(NULL, MOSQ_LOG_DEBUG, "Received UNSUBSCRIBE from %s", context->id);
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if(context->protocol != mosq_p_mqtt31){
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if((context->in_packet.command&0x0F) != 0x02){
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return MOSQ_ERR_PROTOCOL;
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}
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}
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if(packet__read_uint16(&context->in_packet, &mid)) return 1;
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if(mid == 0) return MOSQ_ERR_PROTOCOL;
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if(context->protocol == mosq_p_mqtt5){
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rc = property__read_all(CMD_UNSUBSCRIBE, &context->in_packet, &properties);
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if(rc) return rc;
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/* Immediately free, we don't do anything with User Property at the moment */
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mosquitto_property_free_all(&properties);
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}
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if(context->protocol == mosq_p_mqtt311 || context->protocol == mosq_p_mqtt5){
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if(context->in_packet.pos == context->in_packet.remaining_length){
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/* No topic specified, protocol error. */
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return MOSQ_ERR_PROTOCOL;
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}
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}
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reason_code_max = 10;
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reason_codes = mosquitto__malloc(reason_code_max);
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if(!reason_codes){
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return MOSQ_ERR_NOMEM;
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}
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while(context->in_packet.pos < context->in_packet.remaining_length){
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sub = NULL;
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if(packet__read_string(&context->in_packet, &sub, &slen)){
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return 1;
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}
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if(!slen){
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log__printf(NULL, MOSQ_LOG_INFO,
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"Empty unsubscription string from %s, disconnecting.",
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context->id);
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mosquitto__free(sub);
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return 1;
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}
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if(mosquitto_sub_topic_check(sub)){
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log__printf(NULL, MOSQ_LOG_INFO,
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"Invalid unsubscription string from %s, disconnecting.",
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context->id);
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mosquitto__free(sub);
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return 1;
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}
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log__printf(NULL, MOSQ_LOG_DEBUG, "\t%s", sub);
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rc = sub__remove(db, context, sub, db->subs, &reason);
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log__printf(NULL, MOSQ_LOG_UNSUBSCRIBE, "%s %s", context->id, sub);
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mosquitto__free(sub);
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if(rc) return rc;
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reason_codes[reason_code_count] = reason;
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reason_code_count++;
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if(reason_code_count == reason_code_max){
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reason_tmp = mosquitto__realloc(reason_codes, reason_code_max*2);
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if(!reason_tmp){
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mosquitto__free(reason_codes);
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return MOSQ_ERR_NOMEM;
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}
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reason_codes = reason_tmp;
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reason_code_max *= 2;
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}
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}
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#ifdef WITH_PERSISTENCE
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db->persistence_changes++;
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#endif
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log__printf(NULL, MOSQ_LOG_DEBUG, "Sending UNSUBACK to %s", context->id);
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/* We don't use Reason String or User Property yet. */
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rc = send__unsuback(context, mid, reason_code_count, reason_codes, NULL);
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mosquitto__free(reason_codes);
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return rc;
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}
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