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
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
|
/* Copyright (C) 2007-2010 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 Victor Julien <victor@inliniac.net>
*/
#ifndef __DETECT_CONTENT_H__
#define __DETECT_CONTENT_H__
/* Flags affecting this content */
#define DETECT_CONTENT_NOCASE (1)
#define DETECT_CONTENT_DISTANCE (1 << 1)
#define DETECT_CONTENT_WITHIN (1 << 2)
#define DETECT_CONTENT_OFFSET (1 << 3)
#define DETECT_CONTENT_DEPTH (1 << 4)
#define DETECT_CONTENT_FAST_PATTERN (1 << 5)
#define DETECT_CONTENT_FAST_PATTERN_ONLY (1 << 6)
#define DETECT_CONTENT_FAST_PATTERN_CHOP (1 << 7)
/** content applies to a "raw"/undecoded field if applicable */
#define DETECT_CONTENT_RAWBYTES (1 << 8)
/** content is negated */
#define DETECT_CONTENT_NEGATED (1 << 9)
/** a relative match to this content is next, used in matching phase */
#define DETECT_CONTENT_RELATIVE_NEXT (1 << 10)
/* BE - byte extract */
#define DETECT_CONTENT_OFFSET_BE (1 << 11)
#define DETECT_CONTENT_DEPTH_BE (1 << 12)
#define DETECT_CONTENT_DISTANCE_BE (1 << 13)
#define DETECT_CONTENT_WITHIN_BE (1 << 14)
/* replace data */
#define DETECT_CONTENT_REPLACE (1 << 15)
/* this flag is set during the staging phase. It indicates that a content
* has been added to the mpm phase and requires no further inspection inside
* the inspection phase */
#define DETECT_CONTENT_NO_DOUBLE_INSPECTION_REQUIRED (1 << 16)
#define DETECT_CONTENT_IS_SINGLE(c) (!( ((c)->flags & DETECT_CONTENT_DISTANCE) || \
((c)->flags & DETECT_CONTENT_WITHIN) || \
((c)->flags & DETECT_CONTENT_RELATIVE_NEXT) || \
((c)->flags & DETECT_CONTENT_DEPTH) || \
((c)->flags & DETECT_CONTENT_OFFSET) ))
#include "util-spm-bm.h"
typedef struct DetectContentData_ {
uint8_t *content;
uint16_t content_len;
uint16_t replace_len;
/* for chopped fast pattern, the length */
uint16_t fp_chop_len;
/* would want to move PatIntId here and flags down to remove the padding
* gap, but I think the first four members was used as a template for
* casting. \todo check this and fix it if posssible */
uint32_t flags;
PatIntId id;
uint16_t depth;
uint16_t offset;
/* for chopped fast pattern, the offset */
uint16_t fp_chop_offset;
int32_t distance;
int32_t within;
/* Boyer Moore context (for spm search) */
BmCtx *bm_ctx;
/* pointer to replacement data */
uint8_t *replace;
} DetectContentData;
/* prototypes */
void DetectContentRegister (void);
uint32_t DetectContentMaxId(DetectEngineCtx *);
DetectContentData *DetectContentParse (char *contentstr);
int DetectContentDataParse(const char *keyword, const char *contentstr,
uint8_t **pstr, uint16_t *plen, uint32_t *flags);
DetectContentData *DetectContentParseEncloseQuotes(char *);
int DetectContentSetup(DetectEngineCtx *de_ctx, Signature *s, char *contentstr);
void DetectContentPrint(DetectContentData *);
void DetectContentFree(void *);
#endif /* __DETECT_CONTENT_H__ */
|
