1 files changed, 162 insertions, 0 deletions
diff --git a/src/fluent-bit/plugins/in_mqtt/mqtt.c b/src/fluent-bit/plugins/in_mqtt/mqtt.c
new file mode 100644
index 000000000..d1ae74f1e
--- /dev/null
+++ b/src/fluent-bit/plugins/in_mqtt/mqtt.c
@@ -0,0 +1,162 @@
+/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+
+/*  Fluent Bit
+ *  ==========
+ *  Copyright (C) 2015-2022 The Fluent Bit Authors
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License");
+ *  you may not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS,
+ *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ */
+
+#include <fluent-bit/flb_input.h>
+#include <fluent-bit/flb_input_plugin.h>
+#include <fluent-bit/flb_utils.h>
+#include <fluent-bit/flb_network.h>
+#include <fluent-bit/flb_downstream.h>
+#include <fluent-bit/flb_config_map.h>
+
+#include "mqtt.h"
+#include "mqtt_conn.h"
+#include "mqtt_config.h"
+
+/* Initialize plugin */
+static int in_mqtt_init(struct flb_input_instance *in,
+                        struct flb_config *config, void *data)
+{
+    unsigned short int         port;
+    int                        ret;
+    struct flb_in_mqtt_config *ctx;
+
+    (void) data;
+
+    /* Allocate space for the configuration */
+    ctx = mqtt_config_init(in);
+    if (!ctx) {
+        return -1;
+    }
+    ctx->ins = in;
+    ctx->msgp_len = 0;
+
+    /* Set the context */
+    flb_input_set_context(in, ctx);
+
+    /* Create downstream */
+    port = (unsigned short int) strtoul(ctx->tcp_port, NULL, 10);
+
+    ctx->downstream = flb_downstream_create(FLB_TRANSPORT_TCP,
+                                            in->flags,
+                                            ctx->listen,
+                                            port,
+                                            in->tls,
+                                            config,
+                                            &in->net_setup);
+
+    if (ctx->downstream == NULL) {
+        flb_plg_error(ctx->ins,
+                      "could not initialize downstream on %s:%s. Aborting",
+                      ctx->listen, ctx->tcp_port);
+
+        mqtt_config_free(ctx);
+
+        return -1;
+    }
+
+    flb_input_downstream_set(ctx->downstream, ctx->ins);
+
+    /* Collect upon data available on the standard input */
+    ret = flb_input_set_collector_event(in,
+                                        in_mqtt_collect,
+                                        ctx->downstream->server_fd,
+                                        config);
+    if (ret == -1) {
+        flb_plg_error(ctx->ins, "could not set collector for MQTT input plugin");
+        mqtt_config_free(ctx);
+        return -1;
+    }
+
+    return 0;
+}
+
+/*
+ * For a server event, the collection event means a new client have arrived, we
+ * accept the connection and create a new MQTT instance which will wait for
+ * events/data (MQTT control packages)
+ */
+int in_mqtt_collect(struct flb_input_instance *ins,
+                    struct flb_config *config, void *in_context)
+{
+    struct flb_connection     *connection;
+    struct mqtt_conn          *conn;
+    struct flb_in_mqtt_config *ctx;
+
+    ctx = in_context;
+
+    connection = flb_downstream_conn_get(ctx->downstream);
+
+    if (connection == NULL) {
+        flb_plg_error(ctx->ins, "could not accept new connection");
+
+        return -1;
+    }
+
+    flb_plg_debug(ctx->ins, "[fd=%i] new TCP connection", connection->fd);
+
+    conn = mqtt_conn_add(connection, ctx);
+
+    if (!conn) {
+        flb_downstream_conn_release(connection);
+
+        return -1;
+    }
+
+    return 0;
+}
+
+static int in_mqtt_exit(void *data, struct flb_config *config)
+{
+    (void) *config;
+    struct flb_in_mqtt_config *ctx = data;
+
+    if (!ctx) {
+        return 0;
+    }
+
+    mqtt_conn_destroy_all(ctx);
+
+    mqtt_config_free(ctx);
+
+    return 0;
+}
+
+/* Configuration properties map */	
+static struct flb_config_map config_map[] = {	
+    {
+     FLB_CONFIG_MAP_STR, "payload_key", NULL,
+     0, FLB_TRUE, offsetof(struct flb_in_mqtt_config, payload_key),
+     "Key where the payload will be preserved"
+    },
+    /* EOF */	
+    {0}	
+};
+
+/* Plugin reference */
+struct flb_input_plugin in_mqtt_plugin = {
+    .name         = "mqtt",
+    .description  = "MQTT, listen for Publish messages",
+    .cb_init      = in_mqtt_init,
+    .cb_pre_run   = NULL,
+    .cb_collect   = in_mqtt_collect,
+    .cb_flush_buf = NULL,
+    .cb_exit      = in_mqtt_exit,
+    .config_map   = config_map,
+    .flags        = FLB_INPUT_NET_SERVER | FLB_IO_OPT_TLS
+};