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243 lines
7.4 KiB
C
243 lines
7.4 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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# include "sys_tree.h"
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#else
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# define G_PUB_BYTES_SENT_INC(A)
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#endif
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#include "alias_mosq.h"
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#include "mosquitto.h"
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#include "mosquitto_internal.h"
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#include "logging_mosq.h"
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#include "mqtt_protocol.h"
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#include "memory_mosq.h"
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#include "net_mosq.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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int send__publish(struct mosquitto *mosq, uint16_t mid, const char *topic, uint32_t payloadlen, const void *payload, uint8_t qos, bool retain, bool dup, const mosquitto_property *cmsg_props, const mosquitto_property *store_props, uint32_t expiry_interval)
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{
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#ifdef WITH_BROKER
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#ifdef WITH_BRIDGE
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size_t len;
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int i;
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struct mosquitto__bridge_topic *cur_topic;
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bool match;
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int rc;
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char *mapped_topic = NULL;
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char *topic_temp = NULL;
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#endif
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#endif
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assert(mosq);
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if(!net__is_connected(mosq)) return MOSQ_ERR_NO_CONN;
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if(!mosq->retain_available){
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retain = false;
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}
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#ifdef WITH_BROKER
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#ifdef WITH_BRIDGE
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if(mosq->bridge && mosq->bridge->topics && mosq->bridge->topic_remapping){
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for(i=0; i<mosq->bridge->topic_count; i++){
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cur_topic = &mosq->bridge->topics[i];
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if((cur_topic->direction == bd_both || cur_topic->direction == bd_out)
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&& (cur_topic->remote_prefix || cur_topic->local_prefix)){
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/* Topic mapping required on this topic if the message matches */
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rc = mosquitto_topic_matches_sub(cur_topic->local_topic, topic, &match);
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if(rc){
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return rc;
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}
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if(match){
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mapped_topic = mosquitto__strdup(topic);
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if(!mapped_topic) return MOSQ_ERR_NOMEM;
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if(cur_topic->local_prefix){
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/* This prefix needs removing. */
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if(!strncmp(cur_topic->local_prefix, mapped_topic, strlen(cur_topic->local_prefix))){
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topic_temp = mosquitto__strdup(mapped_topic+strlen(cur_topic->local_prefix));
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mosquitto__free(mapped_topic);
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if(!topic_temp){
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return MOSQ_ERR_NOMEM;
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}
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mapped_topic = topic_temp;
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}
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}
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if(cur_topic->remote_prefix){
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/* This prefix needs adding. */
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len = strlen(mapped_topic) + strlen(cur_topic->remote_prefix)+1;
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topic_temp = mosquitto__malloc(len+1);
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if(!topic_temp){
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mosquitto__free(mapped_topic);
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return MOSQ_ERR_NOMEM;
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}
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snprintf(topic_temp, len, "%s%s", cur_topic->remote_prefix, mapped_topic);
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topic_temp[len] = '\0';
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mosquitto__free(mapped_topic);
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mapped_topic = topic_temp;
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}
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log__printf(NULL, MOSQ_LOG_DEBUG, "Sending PUBLISH to %s (d%d, q%d, r%d, m%d, '%s', ... (%ld bytes))", mosq->id, dup, qos, retain, mid, mapped_topic, (long)payloadlen);
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G_PUB_BYTES_SENT_INC(payloadlen);
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rc = send__real_publish(mosq, mid, mapped_topic, payloadlen, payload, qos, retain, dup, cmsg_props, store_props, expiry_interval);
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mosquitto__free(mapped_topic);
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return rc;
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}
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}
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}
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}
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#endif
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log__printf(NULL, MOSQ_LOG_DEBUG, "Sending PUBLISH to %s (d%d, q%d, r%d, m%d, '%s', ... (%ld bytes))", mosq->id, dup, qos, retain, mid, topic, (long)payloadlen);
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G_PUB_BYTES_SENT_INC(payloadlen);
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#else
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log__printf(mosq, MOSQ_LOG_DEBUG, "Client %s sending PUBLISH (d%d, q%d, r%d, m%d, '%s', ... (%ld bytes))", mosq->id, dup, qos, retain, mid, topic, (long)payloadlen);
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#endif
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return send__real_publish(mosq, mid, topic, payloadlen, payload, qos, retain, dup, cmsg_props, store_props, expiry_interval);
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}
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int send__real_publish(struct mosquitto *mosq, uint16_t mid, const char *topic, uint32_t payloadlen, const void *payload, uint8_t qos, bool retain, bool dup, const mosquitto_property *cmsg_props, const mosquitto_property *store_props, uint32_t expiry_interval)
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{
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struct mosquitto__packet *packet = NULL;
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unsigned int packetlen;
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unsigned int proplen = 0, varbytes;
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int rc;
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mosquitto_property expiry_prop;
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#ifdef WITH_BROKER
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mosquitto_property topic_alias_prop;
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uint16_t topic_alias = 0;
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#endif
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assert(mosq);
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#ifdef WITH_BROKER
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if(mosq->protocol == mosq_p_mqtt5){
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if(alias__find_by_topic(mosq, ALIAS_DIR_L2R, topic, &topic_alias) == MOSQ_ERR_SUCCESS){
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/* If we have an existing alias, no need to send the topic */
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topic = NULL;
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}else{
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/* Try to add a new alias - if this succeeds, topic_alias will be
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* set to the new alias but we still need to send the topic. If it
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* fails, topic_alias will be set to 0. */
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alias__add_l2r(mosq, topic, &topic_alias);
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}
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}
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#endif
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if(topic){
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packetlen = 2+(unsigned int)strlen(topic) + payloadlen;
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}else{
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packetlen = 2 + payloadlen;
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}
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if(qos > 0) packetlen += 2; /* For message id */
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if(mosq->protocol == mosq_p_mqtt5){
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proplen = 0;
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proplen += property__get_length_all(cmsg_props);
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proplen += property__get_length_all(store_props);
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if(expiry_interval > 0){
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expiry_prop.next = NULL;
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expiry_prop.value.i32 = expiry_interval;
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expiry_prop.identifier = MQTT_PROP_MESSAGE_EXPIRY_INTERVAL;
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expiry_prop.client_generated = false;
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proplen += property__get_length_all(&expiry_prop);
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}
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#ifdef WITH_BROKER
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if(topic_alias != 0){
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topic_alias_prop.next = NULL;
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topic_alias_prop.value.i16 = topic_alias;
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topic_alias_prop.identifier = MQTT_PROP_TOPIC_ALIAS;
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topic_alias_prop.client_generated = false;
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proplen += property__get_length_all(&topic_alias_prop);
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}
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#endif
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varbytes = packet__varint_bytes(proplen);
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if(varbytes > 4){
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/* FIXME - Properties too big, don't publish any - should remove some first really */
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cmsg_props = NULL;
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store_props = NULL;
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expiry_interval = 0;
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}else{
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packetlen += proplen + varbytes;
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}
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}
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if(packet__check_oversize(mosq, packetlen)){
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#ifdef WITH_BROKER
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log__printf(NULL, MOSQ_LOG_NOTICE, "Dropping too large outgoing PUBLISH for %s (%d bytes)", mosq->id, packetlen);
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#else
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log__printf(NULL, MOSQ_LOG_NOTICE, "Dropping too large outgoing PUBLISH (%d bytes)", packetlen);
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#endif
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return MOSQ_ERR_OVERSIZE_PACKET;
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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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packet->mid = mid;
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packet->command = (uint8_t)(CMD_PUBLISH | (uint8_t)((dup&0x1)<<3) | (uint8_t)(qos<<1) | retain);
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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 (topic string) */
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if(topic){
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packet__write_string(packet, topic, (uint16_t)strlen(topic));
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}else{
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packet__write_uint16(packet, 0);
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}
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if(qos > 0){
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packet__write_uint16(packet, mid);
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}
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if(mosq->protocol == mosq_p_mqtt5){
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packet__write_varint(packet, proplen);
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property__write_all(packet, cmsg_props, false);
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property__write_all(packet, store_props, false);
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if(expiry_interval > 0){
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property__write_all(packet, &expiry_prop, false);
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}
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#ifdef WITH_BROKER
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if(topic_alias != 0){
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property__write_all(packet, &topic_alias_prop, false);
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}
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#endif
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}
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/* Payload */
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if(payloadlen){
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packet__write_bytes(packet, payload, payloadlen);
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}
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return packet__queue(mosq, packet);
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}
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