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/* Copyright (C) 2007-2020 Open Information Security Foundation
*
* You can copy, redistribute or modify this Program under the terms of
* the GNU General Public License version 2 as published by the Free
* Software Foundation.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* version 2 along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA.
*/
/**
* \file
*
* \author Brian Rectanus <brectanu@gmail.com>
*/
#ifndef __DETECT_BYTEJUMP_H__
#define __DETECT_BYTEJUMP_H__
/** Bytejump Base */
#define DETECT_BYTEJUMP_BASE_UNSET 0 /**< Unset type value string (automatic)*/
#define DETECT_BYTEJUMP_BASE_OCT 8 /**< "oct" type value string */
#define DETECT_BYTEJUMP_BASE_DEC 10 /**< "dec" type value string */
#define DETECT_BYTEJUMP_BASE_HEX 16 /**< "hex" type value string */
/** Bytejump Flags */
#define DETECT_BYTEJUMP_BEGIN BIT_U16(0) /**< "from_beginning" jump */
#define DETECT_BYTEJUMP_LITTLE BIT_U16(1) /**< "little" endian value */
#define DETECT_BYTEJUMP_BIG BIT_U16(2) /**< "big" endian value */
#define DETECT_BYTEJUMP_STRING BIT_U16(3) /**< "string" value */
#define DETECT_BYTEJUMP_RELATIVE BIT_U16(4) /**< "relative" offset */
#define DETECT_BYTEJUMP_ALIGN BIT_U16(5) /**< "align" offset */
#define DETECT_BYTEJUMP_DCE BIT_U16(6) /**< "dce" enabled */
#define DETECT_BYTEJUMP_OFFSET_BE BIT_U16(7) /**< "byte extract" enabled */
#define DETECT_BYTEJUMP_END BIT_U16(8) /**< "from_end" jump */
#define DETECT_BYTEJUMP_NBYTES_VAR BIT_U16(9) /**< nbytes string*/
#define DETECT_BYTEJUMP_OFFSET_VAR BIT_U16(10) /**< byte extract value enabled */
typedef struct DetectBytejumpData_ {
uint8_t nbytes; /**< Number of bytes to compare */
uint8_t base; /**< String value base (oct|dec|hex) */
uint16_t flags; /**< Flags (big|little|relative|string) */
int32_t offset; /**< Offset in payload to extract value */
int32_t post_offset; /**< Offset to adjust post-jump */
uint16_t multiplier; /**< Multiplier for nbytes (multiplier n)*/
} DetectBytejumpData;
/* prototypes */
/**
* Registration function for byte_jump.
*
* \todo add support for no_stream and stream_only
*/
void DetectBytejumpRegister (void);
/**
* This function is used to match byte_jump
*
* \param t pointer to thread vars
* \param det_ctx pointer to the pattern matcher thread
* \param p pointer to the current packet
* \param m pointer to the sigmatch that we will cast into DetectBytejumpData
*
* \retval false no match
* \retval true
*/
bool DetectBytejumpDoMatch(DetectEngineThreadCtx *, const Signature *, const SigMatchCtx *,
const uint8_t *, uint32_t, uint16_t, int32_t, int32_t);
#endif /* __DETECT_BYTEJUMP_H__ */
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