You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
81 lines
2.2 KiB
C
81 lines
2.2 KiB
C
/*
|
|
Copyright (c) 2020-2021 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.
|
|
*/
|
|
|
|
/*
|
|
* This is an *example* plugin which demonstrates how to modify the topic of
|
|
* a message after it is received by the broker and before it is sent on to
|
|
* other clients.
|
|
*
|
|
* You should be very sure of what you are doing before making use of this feature.
|
|
*
|
|
* Compile with:
|
|
* gcc -I<path to mosquitto-repo/include> -fPIC -shared mosquitto_topic_modification.c -o mosquitto_topic_modification.so
|
|
*
|
|
* Use in config with:
|
|
*
|
|
* plugin /path/to/mosquitto_topic_modification.so
|
|
*
|
|
* Note that this only works on Mosquitto 2.0 or later.
|
|
*/
|
|
#include <stdio.h>
|
|
#include <string.h>
|
|
|
|
#include "mosquitto_broker.h"
|
|
#include "mosquitto_plugin.h"
|
|
#include "mosquitto.h"
|
|
#include "mqtt_protocol.h"
|
|
|
|
#define PLUGIN_NAME "topic-modification"
|
|
#define PLUGIN_VERSION "1.0"
|
|
|
|
#define UNUSED(A) (void)(A)
|
|
|
|
MOSQUITTO_PLUGIN_DECLARE_VERSION(5);
|
|
|
|
static mosquitto_plugin_id_t *mosq_pid = NULL;
|
|
|
|
static int callback_message(int event, void *event_data, void *userdata)
|
|
{
|
|
struct mosquitto_evt_message *ed = event_data;
|
|
bool result;
|
|
|
|
UNUSED(event);
|
|
UNUSED(userdata);
|
|
|
|
/* This simply removes "/uplink" from the end of every matching topic. You
|
|
* can of course do much more complicated message processing if needed. */
|
|
|
|
mosquitto_topic_matches_sub("device/+/data/uplink", ed->topic, &result);
|
|
|
|
if(result){
|
|
ed->topic[strlen(ed->topic) - strlen("/uplink")] = '\0';
|
|
}
|
|
|
|
return MOSQ_ERR_SUCCESS;
|
|
}
|
|
|
|
int mosquitto_plugin_init(mosquitto_plugin_id_t *identifier, void **user_data, struct mosquitto_opt *opts, int opt_count)
|
|
{
|
|
UNUSED(user_data);
|
|
UNUSED(opts);
|
|
UNUSED(opt_count);
|
|
|
|
mosq_pid = identifier;
|
|
return mosquitto_callback_register(mosq_pid, MOSQ_EVT_MESSAGE, callback_message, NULL, NULL);
|
|
}
|