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82 lines
2.5 KiB
C
82 lines
2.5 KiB
C
/* Copyright (C) 2020 Open Information Security Foundation
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*
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* You can copy, redistribute or modify this Program under the terms of
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* the GNU General Public License version 2 as published by the Free
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* Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* version 2 along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301, USA.
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*/
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/**
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* \file
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*
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* \author Jeff Lucovsky <jeff@lucovsky.org>
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*/
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#ifndef __DETECT_BYTEMATH_H__
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#define __DETECT_BYTEMATH_H__
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/* flags */
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#define DETECT_BYTEMATH_FLAG_RELATIVE 0x01
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#define DETECT_BYTEMATH_FLAG_STRING 0x02
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#define DETECT_BYTEMATH_FLAG_BITMASK 0x04
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#define DETECT_BYTEMATH_FLAG_ENDIAN 0x08
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#define DETECT_BYTEMATH_RVALUE_VAR 0x10
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/* endian value to be used. Would be stored in DetectByteMathData->endian */
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#define DETECT_BYTEMATH_ENDIAN_NONE 0
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#define DETECT_BYTEMATH_ENDIAN_BIG 1
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#define DETECT_BYTEMATH_ENDIAN_LITTLE 2
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#define DETECT_BYTEMATH_ENDIAN_DCE 3
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#define DETECT_BYTEMATH_OPERATOR_NONE 1
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#define DETECT_BYTEMATH_OPERATOR_PLUS 2
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#define DETECT_BYTEMATH_OPERATOR_MINUS 3
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#define DETECT_BYTEMATH_OPERATOR_DIVIDE 4
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#define DETECT_BYTEMATH_OPERATOR_MULTIPLY 5
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#define DETECT_BYTEMATH_OPERATOR_LSHIFT 6
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#define DETECT_BYTEMATH_OPERATOR_RSHIFT 7
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/**
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* \brief Holds data related to byte_math keyword.
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*/
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typedef struct DetectByteMathData_ {
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/* local id used by other keywords in the sig to reference this */
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uint8_t local_id;
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uint8_t nbytes;
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int32_t offset;
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uint32_t rvalue;
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/* "result" variable, if present */
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const char *result; /* consumed */
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uint8_t flags;
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uint8_t endian;
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uint8_t base;
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uint8_t oper;
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uint32_t bitmask_val;
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uint16_t bitmask_shift_count;
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/* unique id used to reference this byte_math keyword */
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uint16_t id;
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} DetectByteMathData;
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void DetectBytemathRegister(void);
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SigMatch *DetectByteMathRetrieveSMVar(const char *, const Signature *);
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int DetectByteMathDoMatch(DetectEngineThreadCtx *, const SigMatchData *, const Signature *,
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const uint8_t *, uint16_t, uint64_t, uint64_t *, uint8_t);
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#endif /* __DETECT_BYTEMATH_H__ */
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