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/*
* Copyright (c) 2013 Balabit
* Copyright (c) 2013 Balazs Scheidler <bazsi@balabit.hu>
* Copyright (c) 2022 Balazs Scheidler <bazsi77@gmail.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
* As an additional exemption you are allowed to compile & link against the
* OpenSSL libraries as published by the OpenSSL project. See the file
* COPYING for details.
*
*/
#ifndef MULTI_LINE_LOGIC_H_INCLUDED
#define MULTI_LINE_LOGIC_H_INCLUDED
#include "syslog-ng.h"
enum
{
MLL_EXTRACTED = 0x0001,
MLL_WAITING = 0x0002,
MLL_CONSUME_SEGMENT = 0x0010,
MLL_REWIND_SEGMENT = 0x0020,
};
#define MLL_CONSUME_PARTIAL_AMOUNT_SHIFT 8
#define MLL_CONSUME_PARTIAL_AMOUNT_MASK ~0xFF
#define MLL_CONSUME_PARTIALLY(drop_length) (MLL_CONSUME_SEGMENT | ((drop_length) << MLL_CONSUME_PARTIAL_AMOUNT_SHIFT))
typedef struct _MultiLineLogic MultiLineLogic;
struct _MultiLineLogic
{
gint (*accumulate_line)(MultiLineLogic *self,
const guchar *consumed,
gsize consumed_len,
const guchar *segment,
gsize segment_len);
void (*free_fn)(MultiLineLogic *s);
};
void multi_line_logic_init_instance(MultiLineLogic *self);
void multi_line_logic_free_method(MultiLineLogic *s);
/*
* multi_line_logic_accumulate_line():
*
* Accumulate a multi-line message into an internal buffer.
* consumed
* points to the buffer containing our consumed data so far
*
* consumed_len
* The number of bytes in @consumed
*
* segment
* new data to be considered part of consumed
*
* segment_len
* The number of bytes in @segment
*
* The accumulator should return a set of bitfields that indicate what to do
* with the data presented:
*
* What we want to do with the new data
* MLL_CONSUME_SEGMENT -- add the new segment to data consumed
* MLL_CONSUME_PARTIALLY(n) -- add the new segment to the data consumed,
* but dropping (n) characters from the end
* MLL_REWIND_SEGMENT -- the new data is NOT part of the consumed
* data so far, and should be considered
* part of the next line.
*
* What we want to perform once the accumulation is finished:
* MLL_EXTRACTED -- the accumulation is finished, return the
* consumed data as a complete line for higher
* layers.
* MLL_WAITING -- we still need more data
*
*/
static inline gint
multi_line_logic_accumulate_line(MultiLineLogic *self,
const guchar *msg,
gsize msg_len,
const guchar *segment,
gsize segment_len)
{
return self->accumulate_line(self, msg, msg_len, segment, segment_len);
}
static inline void
multi_line_logic_free(MultiLineLogic *self)
{
self->free_fn(self);
}
#endif
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