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72 lines
1.9 KiB
C
72 lines
1.9 KiB
C
/*
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Copyright (c) 2021 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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Abilio Marques - initial implementation and documentation.
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*/
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/*
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* This is an *example* plugin which limits all the subscriptions' QoS to 1.
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*
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* Compile with:
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* gcc -I<path to mosquitto-repo/include> -fPIC -shared mosquitto_limit_subscription.c -o mosquitto_limit_subscription_qos.so
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*
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* Use in config with:
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*
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* plugin /path/to/mosquitto_limit_subscription_qos.so
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*
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* Note that this only works on Mosquitto 2.0 or later.
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*/
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#include <stdio.h>
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#include <string.h>
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#include "mosquitto_broker.h"
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#include "mosquitto_plugin.h"
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#include "mosquitto.h"
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#include "mqtt_protocol.h"
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#define PLUGIN_NAME "limit-subscription-qos"
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#define PLUGIN_VERSION "1.0"
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#define UNUSED(A) (void)(A)
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MOSQUITTO_PLUGIN_DECLARE_VERSION(5);
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static mosquitto_plugin_id_t *mosq_pid = NULL;
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static int callback_subscribe(int event, void *event_data, void *userdata)
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{
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struct mosquitto_evt_subscribe *ed = event_data;
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UNUSED(event);
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UNUSED(userdata);
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if(ed->qos > 1){
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ed->qos = 1;
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}
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return MOSQ_ERR_SUCCESS;
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}
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int mosquitto_plugin_init(mosquitto_plugin_id_t *identifier, void **user_data, struct mosquitto_opt *opts, int opt_count)
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{
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UNUSED(user_data);
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UNUSED(opts);
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UNUSED(opt_count);
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mosq_pid = identifier;
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mosquitto_plugin_set_info(identifier, PLUGIN_NAME, PLUGIN_VERSION);
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return mosquitto_callback_register(mosq_pid, MOSQ_EVT_SUBSCRIBE, callback_subscribe, NULL, NULL);
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}
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