/*
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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 "property_mosq.h"
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int handle__subscribe(struct mosquitto_db *db, struct mosquitto *context)
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{
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int rc = 0;
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int rc2;
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uint16_t mid;
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char *sub;
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uint8_t subscription_options;
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uint32_t subscription_identifier = 0;
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uint8_t qos;
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uint8_t retain_handling = 0;
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uint8_t *payload = NULL, *tmp_payload;
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uint32_t payloadlen = 0;
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int len;
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int slen;
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char *sub_mount;
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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 SUBSCRIBE 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_SUBSCRIBE, &context->in_packet, &properties);
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if(rc) return rc;
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if(mosquitto_property_read_varint(properties, MQTT_PROP_SUBSCRIPTION_IDENTIFIER,
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&subscription_identifier, false)){
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/* If the identifier was force set to 0, this is an error */
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if(subscription_identifier == 0){
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mosquitto_property_free_all(&properties);
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return MOSQ_ERR_PROTOCOL;
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}
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}
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mosquitto_property_free_all(&properties);
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/* Note - User Property not handled */
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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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mosquitto__free(payload);
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return 1;
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}
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if(sub){
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if(!slen){
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log__printf(NULL, MOSQ_LOG_INFO,
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"Empty subscription string from %s, disconnecting.",
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context->address);
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mosquitto__free(sub);
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mosquitto__free(payload);
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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 subscription string from %s, disconnecting.",
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context->address);
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mosquitto__free(sub);
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mosquitto__free(payload);
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return 1;
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}
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if(packet__read_byte(&context->in_packet, &subscription_options)){
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mosquitto__free(sub);
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mosquitto__free(payload);
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return 1;
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}
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if(context->protocol == mosq_p_mqtt31 || context->protocol == mosq_p_mqtt311){
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qos = subscription_options;
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if(context->is_bridge){
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subscription_options = MQTT_SUB_OPT_RETAIN_AS_PUBLISHED | MQTT_SUB_OPT_NO_LOCAL;
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}
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}else{
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qos = subscription_options & 0x03;
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subscription_options &= 0xFC;
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retain_handling = (subscription_options & 0x30);
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if(retain_handling == 0x30 || (subscription_options & 0xC0) != 0){
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return MOSQ_ERR_PROTOCOL;
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}
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}
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if(qos > 2){
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log__printf(NULL, MOSQ_LOG_INFO,
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"Invalid QoS in subscription command from %s, disconnecting.",
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context->address);
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mosquitto__free(sub);
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mosquitto__free(payload);
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return 1;
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}
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if(context->listener && context->listener->mount_point){
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len = strlen(context->listener->mount_point) + slen + 1;
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sub_mount = mosquitto__malloc(len+1);
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if(!sub_mount){
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mosquitto__free(sub);
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mosquitto__free(payload);
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return MOSQ_ERR_NOMEM;
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}
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snprintf(sub_mount, len, "%s%s", context->listener->mount_point, sub);
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sub_mount[len] = '\0';
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mosquitto__free(sub);
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sub = sub_mount;
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}
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log__printf(NULL, MOSQ_LOG_DEBUG, "\t%s (QoS %d)", sub, qos);
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if(context->protocol != mosq_p_mqtt31){
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rc2 = mosquitto_acl_check(db, context, sub, 0, NULL, qos, false, MOSQ_ACL_SUBSCRIBE);
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switch(rc2){
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case MOSQ_ERR_SUCCESS:
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break;
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case MOSQ_ERR_ACL_DENIED:
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qos = 0x80;
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break;
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default:
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mosquitto__free(sub);
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return rc2;
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}
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}
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if(qos != 0x80){
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rc2 = sub__add(db, context, sub, qos, subscription_identifier, subscription_options, &db->subs);
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if(rc2 > 0){
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mosquitto__free(sub);
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return rc2;
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}
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if(context->protocol == mosq_p_mqtt311 || context->protocol == mosq_p_mqtt31){
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if(rc2 == MOSQ_ERR_SUCCESS || rc2 == MOSQ_ERR_SUB_EXISTS){
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if(sub__retain_queue(db, context, sub, qos, 0)) rc = 1;
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}
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}else{
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if((retain_handling == MQTT_SUB_OPT_SEND_RETAIN_ALWAYS)
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|| (rc2 == MOSQ_ERR_SUCCESS && retain_handling == MQTT_SUB_OPT_SEND_RETAIN_NEW)){
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if(sub__retain_queue(db, context, sub, qos, subscription_identifier)) rc = 1;
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}
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}
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log__printf(NULL, MOSQ_LOG_SUBSCRIBE, "%s %d %s", context->id, qos, sub);
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}
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mosquitto__free(sub);
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tmp_payload = mosquitto__realloc(payload, payloadlen + 1);
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if(tmp_payload){
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payload = tmp_payload;
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payload[payloadlen] = qos;
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payloadlen++;
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}else{
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mosquitto__free(payload);
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return MOSQ_ERR_NOMEM;
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}
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}
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}
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if(context->protocol != mosq_p_mqtt31){
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if(payloadlen == 0){
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/* No subscriptions specified, protocol error. */
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return MOSQ_ERR_PROTOCOL;
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}
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}
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if(send__suback(context, mid, payloadlen, payload)) rc = 1;
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mosquitto__free(payload);
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#ifdef WITH_PERSISTENCE
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db->persistence_changes++;
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#endif
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return rc;
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}
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