diff options
Diffstat (limited to 'src/fluent-bit/plugins/in_collectd/in_collectd.c')
| -rw-r--r-- | src/fluent-bit/plugins/in_collectd/in_collectd.c | 226 |
1 files changed, 226 insertions, 0 deletions
diff --git a/src/fluent-bit/plugins/in_collectd/in_collectd.c b/src/fluent-bit/plugins/in_collectd/in_collectd.c new file mode 100644 index 000000000..06ef5ae8a --- /dev/null +++ b/src/fluent-bit/plugins/in_collectd/in_collectd.c @@ -0,0 +1,226 @@ +/* -*- 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 +}; |