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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_utils.h>
#include <fluent-bit/flb_engine.h>
#include <fluent-bit/flb_network.h>
#include <fluent-bit/flb_downstream.h>
#include "syslog.h"
#include "syslog_conf.h"
#include "syslog_conn.h"
#include "syslog_prot.h"
/* Callback invoked every time an event is triggered for a connection */
int syslog_conn_event(void *data)
{
struct flb_connection *connection;
struct syslog_conn *conn;
struct flb_syslog *ctx;
connection = (struct flb_connection *) data;
conn = connection->user_data;
ctx = conn->ctx;
if (ctx->dgram_mode_flag) {
return syslog_dgram_conn_event(data);
}
return syslog_stream_conn_event(data);
}
int syslog_stream_conn_event(void *data)
{
int ret;
int bytes;
int available;
size_t size;
char *tmp;
struct mk_event *event;
struct syslog_conn *conn;
struct flb_syslog *ctx;
struct flb_connection *connection;
connection = (struct flb_connection *) data;
conn = connection->user_data;
ctx = conn->ctx;
event = &connection->event;
if (event->mask & MK_EVENT_READ) {
available = (conn->buf_size - conn->buf_len) - 1;
if (available < 1) {
if (conn->buf_size + ctx->buffer_chunk_size > ctx->buffer_max_size) {
flb_plg_debug(ctx->ins,
"fd=%i incoming data exceed limit (%zd bytes)",
event->fd, (ctx->buffer_max_size));
syslog_conn_del(conn);
return -1;
}
size = conn->buf_size + ctx->buffer_chunk_size;
tmp = flb_realloc(conn->buf_data, size);
if (!tmp) {
flb_errno();
return -1;
}
flb_plg_trace(ctx->ins, "fd=%i buffer realloc %zd -> %zd",
event->fd, conn->buf_size, size);
conn->buf_data = tmp;
conn->buf_size = size;
available = (conn->buf_size - conn->buf_len) - 1;
}
bytes = flb_io_net_read(connection,
(void *) &conn->buf_data[conn->buf_len],
available);
if (bytes > 0) {
flb_plg_trace(ctx->ins, "read()=%i pre_len=%zu now_len=%zu",
bytes, conn->buf_len, conn->buf_len + bytes);
conn->buf_len += bytes;
conn->buf_data[conn->buf_len] = '\0';
ret = syslog_prot_process(conn);
if (ret == -1) {
return -1;
}
return bytes;
}
else {
flb_plg_trace(ctx->ins, "fd=%i closed connection", event->fd);
syslog_conn_del(conn);
return -1;
}
}
if (event->mask & MK_EVENT_CLOSE) {
flb_plg_trace(ctx->ins, "fd=%i hangup", event->fd);
syslog_conn_del(conn);
return -1;
}
return 0;
}
int syslog_dgram_conn_event(void *data)
{
struct flb_connection *connection;
int bytes;
struct syslog_conn *conn;
connection = (struct flb_connection *) data;
conn = connection->user_data;
bytes = flb_io_net_read(connection,
(void *) &conn->buf_data[conn->buf_len],
conn->buf_size - 1);
if (bytes > 0) {
conn->buf_data[bytes] = '\0';
conn->buf_len = bytes;
syslog_prot_process_udp(conn);
}
else {
flb_errno();
}
conn->buf_len = 0;
return 0;
}
/* Create a new mqtt request instance */
struct syslog_conn *syslog_conn_add(struct flb_connection *connection,
struct flb_syslog *ctx)
{
int ret;
struct syslog_conn *conn;
conn = flb_malloc(sizeof(struct syslog_conn));
if (!conn) {
return NULL;
}
conn->connection = connection;
/* Set data for the event-loop */
MK_EVENT_NEW(&connection->event);
connection->user_data = conn;
connection->event.type = FLB_ENGINE_EV_CUSTOM;
connection->event.handler = syslog_conn_event;
/* Connection info */
conn->ctx = ctx;
conn->ins = ctx->ins;
conn->buf_len = 0;
conn->buf_parsed = 0;
/* Allocate read buffer */
conn->buf_data = flb_malloc(ctx->buffer_chunk_size);
if (!conn->buf_data) {
flb_errno();
flb_free(conn);
return NULL;
}
conn->buf_size = ctx->buffer_chunk_size;
/* Register instance into the event loop if we're in
* stream mode (UDP events are received through the collector)
*/
if (!ctx->dgram_mode_flag) {
ret = mk_event_add(flb_engine_evl_get(),
connection->fd,
FLB_ENGINE_EV_CUSTOM,
MK_EVENT_READ,
&connection->event);
if (ret == -1) {
flb_plg_error(ctx->ins, "could not register new connection");
flb_free(conn->buf_data);
flb_free(conn);
return NULL;
}
}
mk_list_add(&conn->_head, &ctx->connections);
return conn;
}
int syslog_conn_del(struct syslog_conn *conn)
{
/* The downstream unregisters the file descriptor from the event-loop
* so there's nothing to be done by the plugin
*/
if (!conn->ctx->dgram_mode_flag) {
flb_downstream_conn_release(conn->connection);
}
/* Release resources */
mk_list_del(&conn->_head);
flb_free(conn->buf_data);
flb_free(conn);
return 0;
}
int syslog_conn_exit(struct flb_syslog *ctx)
{
struct mk_list *tmp;
struct mk_list *head;
struct syslog_conn *conn;
mk_list_foreach_safe(head, tmp, &ctx->connections) {
conn = mk_list_entry(head, struct syslog_conn, _head);
syslog_conn_del(conn);
}
return 0;
}
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