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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_output_plugin.h>
#include <fluent-bit/flb_kv.h>
#include "syslog_conf.h"
static int is_valid_severity(struct flb_output_instance *ins, int val, int format)
{
if (format != FLB_SYSLOG_RFC5424 && format != FLB_SYSLOG_RFC3164) {
flb_plg_error(ins, "[%s] unknown syslog format.", __FUNCTION__);
return -1;
}
if (ins == NULL) {
flb_plg_error(ins, "[%s] arg is null. ins=%p", __FUNCTION__, ins);
return -1;
}
if (val < 0 || val > 7) {
flb_plg_error(ins, "[%s] invalid severity level %d. It should be 0-7.", __FUNCTION__, val);
return -1;
}
return 0;
}
static int is_valid_facility(struct flb_output_instance *ins, int val, int format)
{
if (format != FLB_SYSLOG_RFC5424 && format != FLB_SYSLOG_RFC3164) {
flb_plg_error(ins, "[%s] unknown syslog format.", __FUNCTION__);
return -1;
}
if (ins == NULL) {
flb_plg_error(ins, "[%s] arg is null. ins=%p", __FUNCTION__, ins);
return -1;
}
if (val < 0 || val > 23) {
flb_plg_error(ins, "[%s] invalid facility level %d. It should be 0-23.", __FUNCTION__, val);
return -1;
}
return 0;
}
struct flb_syslog *flb_syslog_config_create(struct flb_output_instance *ins,
struct flb_config *config)
{
int ret;
const char *tmp;
struct flb_syslog *ctx = NULL;
/* Allocate plugin context */
ctx = flb_calloc(1, sizeof(struct flb_syslog));
if (!ctx) {
flb_errno();
return NULL;
}
ctx->ins = ins;
ctx->parsed_mode = FLB_SYSLOG_UDP;
ctx->parsed_format = FLB_SYSLOG_RFC5424;
ctx->maxsize = -1;
/* Populate context with config map defaults and incoming properties */
ret = flb_output_config_map_set(ins, (void *) ctx);
if (ret == -1) {
flb_plg_error(ctx->ins, "configuration error");
flb_syslog_config_destroy(ctx);
return NULL;
}
/* Set context */
flb_output_set_context(ins, ctx);
/* Config Mode */
tmp = flb_output_get_property("mode", ins);
if (tmp) {
if (!strcasecmp(tmp, "tcp")) {
ctx->parsed_mode = FLB_SYSLOG_TCP;
}
else if (!strcasecmp(tmp, "tls")) {
ctx->parsed_mode = FLB_SYSLOG_TLS;
}
else if (!strcasecmp(tmp, "udp")) {
ctx->parsed_mode = FLB_SYSLOG_UDP;
}
else {
flb_plg_error(ctx->ins, "unknown syslog mode %s", tmp);
flb_syslog_config_destroy(ctx);
return NULL;
}
}
/* syslog_format */
tmp = flb_output_get_property("syslog_format", ins);
if (tmp) {
if (strcasecmp(tmp, "rfc3164") == 0) {
ctx->parsed_format = FLB_SYSLOG_RFC3164;
}
else if (strcasecmp(tmp, "rfc5424") == 0) {
ctx->parsed_format = FLB_SYSLOG_RFC5424;
}
else {
flb_plg_error(ctx->ins, "unknown syslog format %s", tmp);
flb_syslog_config_destroy(ctx);
return NULL;
}
}
if (ctx->parsed_format == FLB_SYSLOG_RFC5424 && ctx->allow_longer_sd_id == FLB_TRUE) {
flb_plg_warn(ctx->ins, "Allow longer SD-ID. It may violate RFC5424.");
}
/* validate preset values */
ret = is_valid_severity(ctx->ins, ctx->severity_preset, ctx->parsed_format);
if (ret != 0) {
flb_syslog_config_destroy(ctx);
return NULL;
}
ret = is_valid_facility(ctx->ins, ctx->facility_preset, ctx->parsed_format);
if (ret != 0) {
flb_syslog_config_destroy(ctx);
return NULL;
}
/* syslog maxsize */
if (ctx->maxsize <= 0) {
if (ctx->parsed_format == FLB_SYSLOG_RFC3164) {
ctx->maxsize = 1024;
}
else if (ctx->parsed_format == FLB_SYSLOG_RFC5424) {
ctx->maxsize = 2048;
}
}
return ctx;
}
void flb_syslog_config_destroy(struct flb_syslog *ctx)
{
flb_free(ctx);
}
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