#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_RELATIVE_NEXT (DETECT_CONTENT_WITHIN_NEXT\|DETECT_CONTENT_DISTANCE_NEXT)

#define	DETECT_CONTENT_IS_SINGLE(c)

#define	DETECT_CONTENT_MPM_IS_CONCLUSIVE(c)

Typedefs
typedef struct DetectContentData_	DetectContentData

Functions
void	DetectContentRegister (void)

uint32_t	DetectContentMaxId (DetectEngineCtx *)

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)
	apply depth/offset and distance/within to content matches More...

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_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 67 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 77 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 65 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_WITHIN

#define DETECT_CONTENT_WITHIN BIT_U32(2)

Definition at line 32 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

◆ 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 82 of file detect-content.c.

References SC_ERR_INVALID_SIGNATURE, 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 374 of file detect-content.c.

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

Referenced by DetectContentRegister(), and DetectContentSetup().

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◆ DetectContentMaxId()

uint32_t DetectContentMaxId ( DetectEngineCtx * )

◆ DetectContentParse()

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

DetectContentParse \initonly.

Definition at line 203 of file detect-content.c.

References DetectContentData_::content, DetectContentData_::content_len, DetectContentData_::depth, DetectContentDataParse(), DetectContentData_::distance, len, DetectContentData_::offset, SCFree, SCMalloc, 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 247 of file detect-content.c.

References DetectContentParse().

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◆ DetectContentPMATCHValidateCallback()

bool DetectContentPMATCHValidateCallback ( const Signature * s )

Return values

1	valid
0	invalid

Definition at line 392 of file detect-content.c.

References DetectContentData_::content_len, SigMatch_::ctx, DETECT_CONTENT, DETECT_SM_LIST_PMATCH, FALSE, Signature_::flags, Signature_::init_data, SigMatch_::next, DetectContentData_::offset, SC_ERR_INVALID_SIGNATURE, SCLogError, SIG_FLAG_DSIZE, SigParseGetMaxDsize(), SignatureInitData_::smlists, TRUE, and SigMatch_::type.

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◆ DetectContentPrint()

void DetectContentPrint ( DetectContentData * )

Helper function to print a DetectContentData.

Definition at line 256 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 )

apply depth/offset and distance/within to content matches

The idea is that any limitation we can set is a win, as the mpm can use this to reduce match candidates.

E.g. if we have 'content:"1"; depth:1; content:"2"; distance:0; within:1;' we know that we can add 'offset:1; depth:2;' to the 2nd condition. This will then be used in mpm if the 2nd condition would be selected for mpm.

Another example: 'content:"1"; depth:1; content:"2"; distance:0;'. Here we cannot set a depth, but we can set an offset of 'offset:1;'. This will make the mpm a bit more precise.

Definition at line 440 of file detect-content.c.

References BUG_ON, and Signature_::init_data.

◆ DetectContentRegister()

void DetectContentRegister ( void )

Definition at line 57 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 322 of file detect-content.c.

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

Referenced by DetectContentRegister().

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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_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_WITHIN

◆ DETECT_CONTENT_WITHIN_NEXT

◆ DETECT_CONTENT_WITHIN_VAR

Typedef Documentation

◆ DetectContentData

Function Documentation

◆ DetectContentDataParse()

◆ DetectContentFree()

◆ DetectContentMaxId()

◆ DetectContentParse()

◆ DetectContentParseEncloseQuotes()

◆ DetectContentPMATCHValidateCallback()

◆ DetectContentPrint()

◆ DetectContentPropagateLimits()

◆ DetectContentRegister()

◆ DetectContentSetup()