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/* -*- 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_plugin.h>
#include <fluent-bit/flb_compat.h>
#include <fluent-bit/flb_pack.h>
#include <fluent-bit/flb_utils.h>
#include <msgpack.h>
#include "in_collectd.h"
#include "netprot.h"
#include "typesdb.h"
/*
* Max payload size. By default, Collectd sends up to 1452 bytes
* per a UDP packet, but the limit can be increased up to 65535
* bytes through a configuration parameter.
*
* See network_config_set_buffer_size() in collectd/src/network.c.
*/
#define BUFFER_SIZE 65535
#define DEFAULT_LISTEN "0.0.0.0"
#define DEFAULT_PORT 25826
/* This is where most Linux systems places a default TypesDB */
#define DEFAULT_TYPESDB "/usr/share/collectd/types.db"
static int in_collectd_callback(struct flb_input_instance *i_ins,
struct flb_config *config, void *in_context);
static int in_collectd_init(struct flb_input_instance *in,
struct flb_config *config, void *data)
{
int ret;
struct flb_in_collectd_config *ctx;
struct mk_list *tdb;
char *listen = DEFAULT_LISTEN;
int port = DEFAULT_PORT;
/* Initialize context */
ctx = flb_calloc(1, sizeof(struct flb_in_collectd_config));
if (!ctx) {
flb_errno();
return -1;
}
ctx->ins = in;
ctx->bufsize = BUFFER_SIZE;
ctx->buf = flb_malloc(ctx->bufsize);
if (!ctx->buf) {
flb_errno();
flb_free(ctx);
return -1;
}
/* Load the config map */
ret = flb_input_config_map_set(in, (void *)ctx);
if (ret == -1) {
flb_plg_error(in, "unable to load configuration");
flb_free(ctx);
return -1;
}
/* Listening address */
if (in->host.listen) {
listen = in->host.listen;
}
if (strlen(listen) > sizeof(ctx->listen) - 1) {
flb_plg_error(ctx->ins, "too long address '%s'", listen);
flb_free(ctx);
return -1;
}
strcpy(ctx->listen, listen);
/* Listening port */
if (in->host.port) {
port = in->host.port;
}
snprintf(ctx->port, sizeof(ctx->port), "%hu", (unsigned short) port);
flb_plg_debug(ctx->ins, "Loading TypesDB from %s", ctx->types_db);
tdb = typesdb_load_all(ctx, ctx->types_db);
if (!tdb) {
flb_plg_error(ctx->ins, "failed to load '%s'", ctx->types_db);
flb_free(ctx->buf);
flb_free(ctx);
return -1;
}
ctx->tdb = tdb;
/* Set the context */
flb_input_set_context(in, ctx);
ctx->server_fd = flb_net_server_udp(ctx->port, ctx->listen);
if (ctx->server_fd < 0) {
flb_plg_error(ctx->ins, "failed to bind to %s:%s", ctx->listen,
ctx->port);
typesdb_destroy(ctx->tdb);
flb_free(ctx->buf);
flb_free(ctx);
return -1;
}
/* Set the collector */
ret = flb_input_set_collector_socket(in,
in_collectd_callback,
ctx->server_fd,
config);
if (ret == -1) {
flb_plg_error(ctx->ins, "failed set up a collector");
flb_socket_close(ctx->server_fd);
typesdb_destroy(ctx->tdb);
flb_free(ctx->buf);
flb_free(ctx);
return -1;
}
ctx->coll_fd = ret;
ret = flb_log_event_encoder_init(&ctx->log_encoder,
FLB_LOG_EVENT_FORMAT_DEFAULT);
if (ret != FLB_EVENT_ENCODER_SUCCESS) {
flb_plg_error(ctx->ins, "error initializing event encoder : %d", ret);
flb_socket_close(ctx->server_fd);
typesdb_destroy(ctx->tdb);
flb_free(ctx->buf);
flb_free(ctx);
return -1;
}
flb_plg_info(ctx->ins, "start listening to %s:%s",
ctx->listen, ctx->port);
return 0;
}
static int in_collectd_callback(struct flb_input_instance *i_ins,
struct flb_config *config, void *in_context)
{
int len;
struct flb_in_collectd_config *ctx = in_context;
len = recv(ctx->server_fd, ctx->buf, ctx->bufsize, 0);
if (len < 0) {
flb_errno();
return -1;
}
if (len == 0) {
return 0;
}
flb_log_event_encoder_reset(&ctx->log_encoder);
if (netprot_to_msgpack(ctx->buf, len, ctx->tdb, &ctx->log_encoder)) {
flb_plg_error(ctx->ins, "netprot_to_msgpack fails");
return -1;
}
if (ctx->log_encoder.output_length > 0) {
flb_input_log_append(i_ins, NULL, 0,
ctx->log_encoder.output_buffer,
ctx->log_encoder.output_length);
}
return 0;
}
static int in_collectd_exit(void *data, struct flb_config *config)
{
struct flb_in_collectd_config *ctx = data;
flb_log_event_encoder_destroy(&ctx->log_encoder);
flb_socket_close(ctx->server_fd);
flb_pipe_close(ctx->coll_fd);
typesdb_destroy(ctx->tdb);
flb_free(ctx->buf);
flb_free(ctx);
return 0;
}
static struct flb_config_map config_map[] = {
{
FLB_CONFIG_MAP_STR, "typesdb", DEFAULT_TYPESDB,
0, FLB_TRUE, offsetof(struct flb_in_collectd_config, types_db),
"Set the types database filename"
},
/* EOF */
{0}
};
struct flb_input_plugin in_collectd_plugin = {
.name = "collectd",
.description = "collectd input plugin",
.cb_init = in_collectd_init,
.cb_pre_run = NULL,
.cb_collect = NULL,
.cb_flush_buf = NULL,
.cb_pause = NULL,
.cb_resume = NULL,
.config_map = config_map,
.flags = FLB_INPUT_NET_SERVER,
.cb_exit = in_collectd_exit
};
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