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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_info.h>
#include <fluent-bit/flb_config.h>
#include <fluent-bit/flb_input.h>
#include <fluent-bit/flb_input_plugin.h>
#include <fluent-bit/flb_str.h>
#include <fluent-bit/flb_log.h>
#include <fluent-bit/flb_parser.h>
#include <fluent-bit/flb_utils.h>
#include "syslog.h"
#include "syslog_server.h"
#include "syslog_conf.h"
struct flb_syslog *syslog_conf_create(struct flb_input_instance *ins,
struct flb_config *config)
{
int ret;
char port[16];
struct flb_syslog *ctx;
ctx = flb_calloc(1, sizeof(struct flb_syslog));
if (ctx == NULL) {
flb_errno();
return NULL;
}
ctx->ins = ins;
ctx->log_encoder = flb_log_event_encoder_create(FLB_LOG_EVENT_FORMAT_DEFAULT);
if (ctx->log_encoder == NULL) {
flb_plg_error(ins, "could not initialize event encoder");
syslog_conf_destroy(ctx);
return NULL;
}
mk_list_init(&ctx->connections);
ret = flb_input_config_map_set(ins, (void *)ctx);
if (ret == -1) {
flb_log_event_encoder_destroy(ctx->log_encoder);
flb_plg_error(ins, "unable to load configuration");
flb_free(ctx);
return NULL;
}
/* Syslog mode: unix_udp, unix_tcp, tcp or udp */
if (ctx->mode_str) {
#ifdef FLB_SYSTEM_WINDOWS
if (strcasestr(ctx->mode_str, "unix") != NULL) {
flb_log_event_encoder_destroy(ctx->log_encoder);
flb_plg_error(ins, "unix sockets are note available in windows");
flb_free(ctx);
return NULL;
}
#undef FLB_SYSLOG_UNIX_UDP
#define FLB_SYSLOG_UNIX_UDP FLB_SYSLOG_UDP
#endif
if (strcasecmp(ctx->mode_str, "unix_tcp") == 0) {
ctx->mode = FLB_SYSLOG_UNIX_TCP;
}
else if (strcasecmp(ctx->mode_str, "unix_udp") == 0) {
ctx->mode = FLB_SYSLOG_UNIX_UDP;
}
else if (strcasecmp(ctx->mode_str, "tcp") == 0) {
ctx->mode = FLB_SYSLOG_TCP;
}
else if (strcasecmp(ctx->mode_str, "udp") == 0) {
ctx->mode = FLB_SYSLOG_UDP;
}
else {
flb_log_event_encoder_destroy(ctx->log_encoder);
flb_error("[in_syslog] Unknown syslog mode %s", ctx->mode_str);
flb_free(ctx);
return NULL;
}
}
else {
ctx->mode = FLB_SYSLOG_UNIX_UDP;
}
/* Check if TCP mode was requested */
if (ctx->mode == FLB_SYSLOG_TCP || ctx->mode == FLB_SYSLOG_UDP) {
/* Listen interface (if not set, defaults to 0.0.0.0:5140) */
flb_input_net_default_listener("0.0.0.0", 5140, ins);
ctx->listen = ins->host.listen;
snprintf(port, sizeof(port) - 1, "%d", ins->host.port);
ctx->port = flb_strdup(port);
}
/* Unix socket path and permission */
if (ctx->mode == FLB_SYSLOG_UNIX_UDP || ctx->mode == FLB_SYSLOG_UNIX_TCP) {
if (ctx->unix_perm_str) {
ctx->unix_perm = strtol(ctx->unix_perm_str, NULL, 8) & 07777;
} else {
ctx->unix_perm = 0644;
}
}
/* Buffer Chunk Size */
if (ctx->buffer_chunk_size == -1) {
flb_log_event_encoder_destroy(ctx->log_encoder);
flb_plg_error(ins, "invalid buffer_chunk_size");
flb_free(ctx);
return NULL;
}
/* Buffer Max Size */
if (ctx->buffer_max_size == -1) {
flb_log_event_encoder_destroy(ctx->log_encoder);
flb_plg_error(ins, "invalid buffer_max_size");
flb_free(ctx);
return NULL;
}
else if (ctx->buffer_max_size == 0) {
ctx->buffer_max_size = ctx->buffer_chunk_size;
}
/* Socket rcv buffer size */
if (ctx->receive_buffer_size == -1 || ctx->receive_buffer_size>INT_MAX) {
flb_log_event_encoder_destroy(ctx->log_encoder);
flb_plg_error(ins, "invalid receive_buffer_size");
flb_free(ctx);
return NULL;
}
/* Parser */
if (ctx->parser_name) {
ctx->parser = flb_parser_get(ctx->parser_name, config);
}
else {
if (ctx->mode == FLB_SYSLOG_TCP || ctx->mode == FLB_SYSLOG_UDP) {
ctx->parser = flb_parser_get("syslog-rfc5424", config);
}
else {
ctx->parser = flb_parser_get("syslog-rfc3164-local", config);
}
}
if (!ctx->parser) {
flb_log_event_encoder_destroy(ctx->log_encoder);
flb_error("[in_syslog] parser not set");
syslog_conf_destroy(ctx);
return NULL;
}
return ctx;
}
int syslog_conf_destroy(struct flb_syslog *ctx)
{
if (ctx->log_encoder != NULL) {
flb_log_event_encoder_destroy(ctx->log_encoder);
}
syslog_server_destroy(ctx);
flb_free(ctx);
return 0;
}
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