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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.
*/
/*
* This file implements a collectd 5.x compatible parser for types.db(5).
*
* Note: it internally implements a finite state machine that consumes a
* single char at once, and pushes parsed tokens via typesdb_* methods.
*/
#include <fluent-bit/flb_compat.h>
#include <fluent-bit/flb_log.h>
#include <fluent-bit/flb_mem.h>
#include <fluent-bit/flb_str.h>
#include "typesdb.h"
#include "typesdb_parser.h"
#define TDB_INVALID -1
#define TDB_INIT 0
#define TDB_LEFT 1
#define TDB_SEP 2
#define TDB_RIGHT 3
#define TDB_RIGHT_SEP 4
#define TDB_COMMENT 5
/* See collectd/src/daemon/types_list.c */
#define MAX_LINE_SIZE 4096
/*
* tdb_* are state functions that take a single character as input.
* They do some action based on the input and return the next state.
*/
static int tdb_init(char c, struct mk_list *tdb, char *buf)
{
switch (c) {
case '#':
return TDB_COMMENT;
case '\r':
case '\n':
return TDB_INIT;
default:
buf[0] = c;
buf[1] = '\0';
return TDB_LEFT;
}
}
static int tdb_left(char c, struct mk_list *tdb, char *buf)
{
int len;
switch (c) {
case ' ':
if (typesdb_add_node(tdb, buf)) {
return TDB_INVALID;
}
return TDB_SEP;
case '\r':
case '\n':
return TDB_INVALID;
default:
len = strlen(buf);
if (len >= MAX_LINE_SIZE - 1) {
return TDB_INVALID;
}
buf[len] = c;
buf[++len] = '\0';
return TDB_LEFT;
}
}
static int tdb_sep(char c, struct mk_list *tdb, char *buf)
{
switch (c) {
case ' ':
return TDB_SEP;
case '\r':
case '\n':
return TDB_INVALID;
default:
buf[0] = c;
buf[1] = '\0';
return TDB_RIGHT;
}
}
static int tdb_right(char c, struct mk_list *tdb, char *buf)
{
int len;
struct typesdb_node *node = typesdb_last_node(tdb);
switch (c) {
case ' ':
case ',':
if (typesdb_add_field(node, buf)) {
flb_error("[in_collectd] cannot add value '%s'", buf);
return TDB_INVALID;
}
return TDB_RIGHT_SEP;
case '\r':
case '\n':
if (typesdb_add_field(node, buf)) {
flb_error("[in_collectd] cannot add value '%s'", buf);
return TDB_INVALID;
}
return TDB_INIT;
default:
len = strlen(buf);
if (len >= MAX_LINE_SIZE - 1) {
flb_error("[in_collectd] line too long > %i", MAX_LINE_SIZE);
return TDB_INVALID;
}
buf[len] = c;
buf[++len] = '\0';
return TDB_RIGHT;
}
}
static int tdb_right_sep(char c, struct mk_list *tdb, char *buf)
{
switch (c) {
case ' ':
case ',':
return TDB_RIGHT_SEP;
case '\r':
case '\n':
return TDB_INIT;
default:
buf[0] = c;
buf[1] = '\0';
return TDB_RIGHT;
}
}
static int tdb_comment(char c, struct mk_list *tdb, char *buf)
{
switch (c) {
case '\r':
case '\n':
return TDB_INIT;
default:
return TDB_COMMENT;
}
}
/*
* Entry point function
*/
int typesdb_parse(struct mk_list *tdb, int fp)
{
char tmp[1024];
char buf[MAX_LINE_SIZE];
char c;
int i;
int bytes;
int state = TDB_INIT;
while (1) {
bytes = read(fp, tmp, 1024);
if (bytes < 0) {
flb_errno();
return bytes;
}
if (bytes == 0) {
return 0;
}
for (i = 0; i < bytes; i++) {
c = tmp[i];
switch (state) {
case TDB_INVALID:
return -1;
case TDB_INIT:
state = tdb_init(c, tdb, buf);
break;
case TDB_LEFT:
state = tdb_left(c, tdb, buf);
break;
case TDB_SEP:
state = tdb_sep(c, tdb, buf);
break;
case TDB_RIGHT:
state = tdb_right(c, tdb, buf);
break;
case TDB_RIGHT_SEP:
state = tdb_right_sep(c, tdb, buf);
break;
case TDB_COMMENT:
state = tdb_comment(c, tdb, buf);
break;
default:
flb_error("[in_collectd] unknown state %i", state);
return -1;
}
}
}
return 0;
}
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