1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
|
/* 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_BYTETEST_H__
#define __DETECT_BYTETEST_H__
/** Bytetest Operators */
#define DETECT_BYTETEST_OP_LT 1 /**< "less than" operator */
#define DETECT_BYTETEST_OP_GT 2 /**< "greater than" operator */
#define DETECT_BYTETEST_OP_EQ 3 /**< "equals" operator */
#define DETECT_BYTETEST_OP_AND 4 /**< "bitwise and" operator */
#define DETECT_BYTETEST_OP_OR 5 /**< "bitwise or" operator */
#define DETECT_BYTETEST_OP_GE 6 /**< greater than equal operator */
#define DETECT_BYTETEST_OP_LE 7 /**< less than equal operator */
/** Bytetest Base */
#define DETECT_BYTETEST_BASE_UNSET 0 /**< Unset type value string (automatic)*/
#define DETECT_BYTETEST_BASE_OCT 8 /**< "oct" type value string */
#define DETECT_BYTETEST_BASE_DEC 10 /**< "dec" type value string */
#define DETECT_BYTETEST_BASE_HEX 16 /**< "hex" type value string */
/** Bytetest Flags */
#define DETECT_BYTETEST_LITTLE BIT_U16(0) /**< "little" endian value */
#define DETECT_BYTETEST_BIG BIT_U16(1) /**< "bi" endian value */
#define DETECT_BYTETEST_STRING BIT_U16(2) /**< "string" value */
#define DETECT_BYTETEST_RELATIVE BIT_U16(3) /**< "relative" offset */
#define DETECT_BYTETEST_DCE BIT_U16(4) /**< dce enabled */
#define DETECT_BYTETEST_BITMASK BIT_U16(5) /**< bitmask supplied*/
#define DETECT_BYTETEST_VALUE_VAR BIT_U16(6) /**< byte extract value enabled */
#define DETECT_BYTETEST_OFFSET_VAR BIT_U16(7) /**< byte extract value enabled */
#define DETECT_BYTETEST_NBYTES_VAR BIT_U16(8) /**< byte extract value enabled */
typedef struct DetectBytetestData_ {
uint8_t nbytes; /**< Number of bytes to compare */
uint8_t op; /**< Operator used to compare */
uint8_t base; /**< String value base (oct|dec|hex) */
uint8_t bitmask_shift_count; /**< bitmask trailing 0 count */
uint16_t flags; /**< Flags (big|little|relative|string|bitmask) */
bool neg_op;
int32_t offset; /**< Offset in payload */
uint32_t bitmask; /**< bitmask value */
uint64_t value; /**< Value to compare against */
} DetectBytetestData;
/* prototypes */
/**
* Registration function for byte_test.
*
* \todo add support for no_stream and stream_only
*/
void DetectBytetestRegister (void);
int DetectBytetestDoMatch(DetectEngineThreadCtx *, const Signature *, const SigMatchCtx *ctx,
const uint8_t *, uint32_t, uint16_t, int32_t, int32_t, uint64_t);
#endif /* __DETECT_BYTETEST_H__ */
|
