#include "util-spm.h"

Include dependency graph for detect-content.h:

Data Structures
struct	DetectContentData_

Macros
#define	DETECT_CONTENT_NOCASE BIT_U32(0)

#define	DETECT_CONTENT_DISTANCE BIT_U32(1)

#define	DETECT_CONTENT_WITHIN BIT_U32(2)

#define	DETECT_CONTENT_OFFSET BIT_U32(3)

#define	DETECT_CONTENT_DEPTH BIT_U32(4)

#define	DETECT_CONTENT_FAST_PATTERN BIT_U32(5)

#define	DETECT_CONTENT_FAST_PATTERN_ONLY BIT_U32(6)

#define	DETECT_CONTENT_FAST_PATTERN_CHOP BIT_U32(7)

#define	DETECT_CONTENT_RAWBYTES BIT_U32(8)

#define	DETECT_CONTENT_NEGATED BIT_U32(9)

#define	DETECT_CONTENT_ENDS_WITH BIT_U32(10)

#define	DETECT_CONTENT_OFFSET_VAR BIT_U32(11)

#define	DETECT_CONTENT_DEPTH_VAR BIT_U32(12)

#define	DETECT_CONTENT_DISTANCE_VAR BIT_U32(13)

#define	DETECT_CONTENT_WITHIN_VAR BIT_U32(14)

#define	DETECT_CONTENT_REPLACE BIT_U32(15)

#define	DETECT_CONTENT_NO_DOUBLE_INSPECTION_REQUIRED BIT_U32(16)

#define	DETECT_CONTENT_WITHIN_NEXT BIT_U32(17)

#define	DETECT_CONTENT_DISTANCE_NEXT BIT_U32(18)

#define	DETECT_CONTENT_STARTS_WITH BIT_U32(19)

#define	DETECT_CONTENT_MPM BIT_U32(20)

#define	DETECT_CONTENT_WITHIN2DEPTH BIT_U32(21)

#define	DETECT_CONTENT_DISTANCE2OFFSET BIT_U32(22)

#define	DETECT_CONTENT_RELATIVE_NEXT (DETECT_CONTENT_WITHIN_NEXT\|DETECT_CONTENT_DISTANCE_NEXT)

#define	DETECT_CONTENT_IS_SINGLE(c)

#define	DETECT_CONTENT_MPM_IS_CONCLUSIVE(c)

#define	DETECT_CONTENT_VALUE_MAX 1024 * 1024

Typedefs
typedef struct DetectContentData_	DetectContentData

Functions
void	DetectContentRegister (void)

DetectContentData *	DetectContentParse (SpmGlobalThreadCtx spm_global_thread_ctx, const char contentstr)
	DetectContentParse \initonly. More...

int	DetectContentDataParse (const char keyword, const char contentstr, uint8_t *pstr, uint16_t plen)
	Parse a content string, ie "abc\|DE\|fgh". More...

DetectContentData *	DetectContentParseEncloseQuotes (SpmGlobalThreadCtx spm_global_thread_ctx, const char contentstr)

int	DetectContentSetup (DetectEngineCtx de_ctx, Signature s, const char *contentstr)
	Function to setup a content pattern. More...

void	DetectContentPrint (DetectContentData *)
	Helper function to print a DetectContentData. More...

void	DetectContentFree (DetectEngineCtx , void )
	this function will SCFree memory associated with DetectContentData More...

bool	DetectContentPMATCHValidateCallback (const Signature *s)

void	DetectContentPropagateLimits (Signature *s)

void	DetectContentPatternPrettyPrint (const DetectContentData cd, char str, size_t str_len)

void	SigParseRequiredContentSize (const Signature s, const int max, const SigMatch sm, int len, int offset)
	Determine the size needed to accommodate the content elements of a signature. More...

int	DetectContentConvertToNocase (DetectEngineCtx de_ctx, DetectContentData cd)

Detailed Description

Author: Victor Julien victo.nosp@m.r@in.nosp@m.linia.nosp@m.c.ne.nosp@m.t

Definition in file detect-content.h.

Macro Definition Documentation

◆ DETECT_CONTENT_DEPTH

#define DETECT_CONTENT_DEPTH BIT_U32(4)

Definition at line 34 of file detect-content.h.

◆ DETECT_CONTENT_DEPTH_VAR

#define DETECT_CONTENT_DEPTH_VAR BIT_U32(12)

Definition at line 47 of file detect-content.h.

◆ DETECT_CONTENT_DISTANCE

#define DETECT_CONTENT_DISTANCE BIT_U32(1)

Definition at line 31 of file detect-content.h.

◆ DETECT_CONTENT_DISTANCE2OFFSET

#define DETECT_CONTENT_DISTANCE2OFFSET BIT_U32(22)

Definition at line 64 of file detect-content.h.

◆ DETECT_CONTENT_DISTANCE_NEXT

#define DETECT_CONTENT_DISTANCE_NEXT BIT_U32(18)

Definition at line 59 of file detect-content.h.

◆ DETECT_CONTENT_DISTANCE_VAR

#define DETECT_CONTENT_DISTANCE_VAR BIT_U32(13)

Definition at line 48 of file detect-content.h.

◆ DETECT_CONTENT_ENDS_WITH

#define DETECT_CONTENT_ENDS_WITH BIT_U32(10)

Definition at line 43 of file detect-content.h.

◆ DETECT_CONTENT_FAST_PATTERN

#define DETECT_CONTENT_FAST_PATTERN BIT_U32(5)

Definition at line 35 of file detect-content.h.

◆ DETECT_CONTENT_FAST_PATTERN_CHOP

#define DETECT_CONTENT_FAST_PATTERN_CHOP BIT_U32(7)

Definition at line 37 of file detect-content.h.

◆ DETECT_CONTENT_FAST_PATTERN_ONLY

#define DETECT_CONTENT_FAST_PATTERN_ONLY BIT_U32(6)

Definition at line 36 of file detect-content.h.

◆ DETECT_CONTENT_IS_SINGLE

#define DETECT_CONTENT_IS_SINGLE ( c )

Value:

                                        (!( ((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) ))

Definition at line 69 of file detect-content.h.

◆ DETECT_CONTENT_MPM

#define DETECT_CONTENT_MPM BIT_U32(20)

MPM pattern selected by the engine or forced by fast_pattern keyword

Definition at line 62 of file detect-content.h.

◆ DETECT_CONTENT_MPM_IS_CONCLUSIVE

#define DETECT_CONTENT_MPM_IS_CONCLUSIVE ( c )

Value:

                                    !( ((c)->flags & DETECT_CONTENT_DISTANCE) || \
                                       ((c)->flags & DETECT_CONTENT_WITHIN)   || \
                                       ((c)->flags & DETECT_CONTENT_DEPTH)    || \
                                       ((c)->flags & DETECT_CONTENT_OFFSET)   || \
                                       ((c)->flags & DETECT_CONTENT_FAST_PATTERN_CHOP))

Definition at line 79 of file detect-content.h.

◆ DETECT_CONTENT_NEGATED

#define DETECT_CONTENT_NEGATED BIT_U32(9)

content is negated

Definition at line 41 of file detect-content.h.

◆ DETECT_CONTENT_NO_DOUBLE_INSPECTION_REQUIRED

#define DETECT_CONTENT_NO_DOUBLE_INSPECTION_REQUIRED BIT_U32(16)

Definition at line 56 of file detect-content.h.

◆ DETECT_CONTENT_NOCASE

#define DETECT_CONTENT_NOCASE BIT_U32(0)

Definition at line 30 of file detect-content.h.

◆ DETECT_CONTENT_OFFSET

#define DETECT_CONTENT_OFFSET BIT_U32(3)

Definition at line 33 of file detect-content.h.

◆ DETECT_CONTENT_OFFSET_VAR

#define DETECT_CONTENT_OFFSET_VAR BIT_U32(11)

Definition at line 46 of file detect-content.h.

◆ DETECT_CONTENT_RAWBYTES

#define DETECT_CONTENT_RAWBYTES BIT_U32(8)

content applies to a "raw"/undecoded field if applicable

Definition at line 39 of file detect-content.h.

◆ DETECT_CONTENT_RELATIVE_NEXT

#define DETECT_CONTENT_RELATIVE_NEXT (DETECT_CONTENT_WITHIN_NEXT|DETECT_CONTENT_DISTANCE_NEXT)

a relative match to this content is next, used in matching phase

Definition at line 67 of file detect-content.h.

◆ DETECT_CONTENT_REPLACE

#define DETECT_CONTENT_REPLACE BIT_U32(15)

Definition at line 52 of file detect-content.h.

◆ DETECT_CONTENT_STARTS_WITH

#define DETECT_CONTENT_STARTS_WITH BIT_U32(19)

Definition at line 60 of file detect-content.h.

◆ DETECT_CONTENT_VALUE_MAX

#define DETECT_CONTENT_VALUE_MAX 1024 * 1024

Definition at line 90 of file detect-content.h.

◆ DETECT_CONTENT_WITHIN

#define DETECT_CONTENT_WITHIN BIT_U32(2)

Definition at line 32 of file detect-content.h.

◆ DETECT_CONTENT_WITHIN2DEPTH

#define DETECT_CONTENT_WITHIN2DEPTH BIT_U32(21)

Definition at line 63 of file detect-content.h.

◆ DETECT_CONTENT_WITHIN_NEXT

#define DETECT_CONTENT_WITHIN_NEXT BIT_U32(17)

Definition at line 58 of file detect-content.h.

◆ DETECT_CONTENT_WITHIN_VAR

#define DETECT_CONTENT_WITHIN_VAR BIT_U32(14)

Definition at line 49 of file detect-content.h.

Typedef Documentation

◆ DetectContentData

typedef struct DetectContentData_ DetectContentData

Function Documentation

◆ DetectContentConvertToNocase()

int DetectContentConvertToNocase	(	DetectEngineCtx *	de_ctx,
		DetectContentData *	cd
	)

Definition at line 765 of file detect-content.c.

References DetectContentData_::content, DetectContentData_::content_len, de_ctx, DETECT_CONTENT_NOCASE, DetectContentData_::flags, SCLogError, DetectContentData_::spm_ctx, DetectEngineCtx_::spm_global_thread_ctx, SpmDestroyCtx(), SpmInitCtx(), and u8_tolower.

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◆ DetectContentDataParse()

int DetectContentDataParse	(	const char *	keyword,
		const char *	contentstr,
		uint8_t **	pstr,
		uint16_t *	plen
	)

Parse a content string, ie "abc|DE|fgh".

Parameters

content_str	null terminated string containing the content
result	result pointer to pass the fully parsed byte array
result_len	size of the resulted data
flags	flags to be set by this parsing function

Return values

-1	error
0	ok

Definition at line 83 of file detect-content.c.

References SCCalloc, SCLogDebug, SCLogError, str, and strlcpy().

Referenced by DetectContentParse().

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◆ DetectContentFree()

void DetectContentFree	(	DetectEngineCtx *	de_ctx,
		void *	ptr
	)

this function will SCFree memory associated with DetectContentData

Parameters

cd	pointer to DetectContentData

Definition at line 372 of file detect-content.c.

References SCEnter, SCFree, SCReturn, DetectContentData_::spm_ctx, and SpmDestroyCtx().

Referenced by DetectContentRegister(), and DetectContentSetup().

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◆ DetectContentParse()

DetectContentData* DetectContentParse	(	SpmGlobalThreadCtx *	spm_global_thread_ctx,
		const char *	contentstr
	)

DetectContentParse \initonly.

Definition at line 211 of file detect-content.c.

References DetectContentData_::content, DetectContentData_::content_len, DetectContentData_::depth, DetectContentDataParse(), DetectContentData_::distance, len, DetectContentData_::offset, SCCalloc, SCFree, DetectContentData_::spm_ctx, SpmInitCtx(), unlikely, and DetectContentData_::within.

Referenced by DetectContentParseEncloseQuotes(), and DetectContentSetup().

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◆ DetectContentParseEncloseQuotes()

DetectContentData* DetectContentParseEncloseQuotes	(	SpmGlobalThreadCtx *	spm_global_thread_ctx,
		const char *	contentstr
	)

Definition at line 253 of file detect-content.c.

References DetectContentParse().

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◆ DetectContentPatternPrettyPrint()

void DetectContentPatternPrettyPrint	(	const DetectContentData *	cd,
		char *	str,
		size_t	str_len
	)

Definition at line 744 of file detect-content.c.

References DetectContentData_::content_len.

Referenced by DumpPatterns().

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◆ DetectContentPMATCHValidateCallback()

bool DetectContentPMATCHValidateCallback ( const Signature * s )

Return values

true	valid
false	invalid

Definition at line 454 of file detect-content.c.

References Signature_::flags, SCLogDebug, SCLogError, SIG_FLAG_DSIZE, SigParseGetMaxDsize(), and SigParseMaxRequiredDsize().

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◆ DetectContentPrint()

void DetectContentPrint ( DetectContentData * )

Helper function to print a DetectContentData.

Definition at line 262 of file detect-content.c.

References DetectContentData_::content, DetectContentData_::content_len, DetectContentData_::depth, DETECT_CONTENT_NEGATED, DETECT_CONTENT_RELATIVE_NEXT, DetectContentData_::distance, DetectContentData_::flags, DetectContentData_::id, DetectContentData_::offset, DetectContentData_::replace, DetectContentData_::replace_len, SCFree, SCLogDebug, SCMalloc, and DetectContentData_::within.

Referenced by DetectContentSetup().

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◆ DetectContentPropagateLimits()

void DetectContentPropagateLimits ( Signature * s )

Definition at line 716 of file detect-content.c.

◆ DetectContentRegister()

void DetectContentRegister ( void )

Definition at line 58 of file detect-content.c.

References SigTableElmt_::desc, DETECT_CONTENT, DetectContentFree(), DetectContentSetup(), SigTableElmt_::Free, SigTableElmt_::Match, SigTableElmt_::name, SigTableElmt_::RegisterTests, SigTableElmt_::Setup, sigmatch_table, and SigTableElmt_::url.

Referenced by SigTableSetup().

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◆ DetectContentSetup()

int DetectContentSetup	(	DetectEngineCtx *	de_ctx,
		Signature *	s,
		const char *	contentstr
	)

Function to setup a content pattern.

Parameters

de_ctx	pointer to the current detection_engine
s	pointer to the current Signature
m	pointer to the last parsed SigMatch
contentstr	pointer to the current keyword content string

Return values

-1	if error
0	if all was ok

Definition at line 328 of file detect-content.c.

References DetectContentData_::content, DetectContentData_::content_len, de_ctx, DETECT_CONTENT, DETECT_CONTENT_NEGATED, DETECT_SM_LIST_MAX, DETECT_SM_LIST_NOTSET, DETECT_SM_LIST_PMATCH, DetectBufferGetActiveList(), DetectContentFree(), DetectContentParse(), DetectContentPrint(), DetectEngineBufferTypeValidateTransform(), DetectContentData_::flags, Signature_::init_data, SignatureInitData_::list, SignatureInitData_::negated, SCLogError, SigMatchAppendSMToList(), and DetectEngineCtx_::spm_global_thread_ctx.

Referenced by DetectContentRegister().

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◆ SigParseRequiredContentSize()

void SigParseRequiredContentSize	(	const Signature *	s,
		const int	max_size,
		const SigMatch *	sm,
		int *	len,
		int *	offset
	)

Determine the size needed to accommodate the content elements of a signature.

Parameters

s	signature to get dsize value from
max_size	Maximum buffer/data size allowed.
list	signature match list.
len	Maximum length required
offset	Maximum offset encountered

Note that negated content does not contribute to the maximum required size value. However, each negated content's values must not exceed the size value.

Values from negated content blocks are used to determine if the negated content block requires a value that exceeds "max_size". The distance and within values from negated content blocks are added to the running total of required content size to see if the max_size would be exceeded.

Non-negated content contributes to the required size (content length, distance)
Negated content values are checked but not accumulated for the required size.

Definition at line 408 of file detect-content.c.

References DetectContentData_::content_len, SigMatch_::ctx, DetectContentData_::depth, DETECT_CONTENT, DETECT_CONTENT_DISTANCE, DETECT_CONTENT_NEGATED, DETECT_CONTENT_WITHIN, DetectContentData_::distance, DetectContentData_::flags, len, MAX, SigMatch_::next, offset, DetectContentData_::offset, SCLogDebug, SigMatch_::type, and DetectContentData_::within.

Referenced by SigParseMaxRequiredDsize().

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Data Structures

Macros

Typedefs

Functions

Detailed Description

Macro Definition Documentation

◆ DETECT_CONTENT_DEPTH

◆ DETECT_CONTENT_DEPTH_VAR

◆ DETECT_CONTENT_DISTANCE

◆ DETECT_CONTENT_DISTANCE2OFFSET

◆ DETECT_CONTENT_DISTANCE_NEXT

◆ DETECT_CONTENT_DISTANCE_VAR

◆ DETECT_CONTENT_ENDS_WITH

◆ DETECT_CONTENT_FAST_PATTERN

◆ DETECT_CONTENT_FAST_PATTERN_CHOP

◆ DETECT_CONTENT_FAST_PATTERN_ONLY

◆ DETECT_CONTENT_IS_SINGLE

◆ DETECT_CONTENT_MPM

◆ DETECT_CONTENT_MPM_IS_CONCLUSIVE

◆ DETECT_CONTENT_NEGATED

◆ DETECT_CONTENT_NO_DOUBLE_INSPECTION_REQUIRED

◆ DETECT_CONTENT_NOCASE

◆ DETECT_CONTENT_OFFSET

◆ DETECT_CONTENT_OFFSET_VAR

◆ DETECT_CONTENT_RAWBYTES

◆ DETECT_CONTENT_RELATIVE_NEXT

◆ DETECT_CONTENT_REPLACE

◆ DETECT_CONTENT_STARTS_WITH

◆ DETECT_CONTENT_VALUE_MAX

◆ DETECT_CONTENT_WITHIN

◆ DETECT_CONTENT_WITHIN2DEPTH

◆ DETECT_CONTENT_WITHIN_NEXT

◆ DETECT_CONTENT_WITHIN_VAR

Typedef Documentation

◆ DetectContentData

Function Documentation

◆ DetectContentConvertToNocase()

◆ DetectContentDataParse()

◆ DetectContentFree()

◆ DetectContentParse()

◆ DetectContentParseEncloseQuotes()

◆ DetectContentPatternPrettyPrint()

◆ DetectContentPMATCHValidateCallback()

◆ DetectContentPrint()

◆ DetectContentPropagateLimits()

◆ DetectContentRegister()

◆ DetectContentSetup()

◆ SigParseRequiredContentSize()