#include "detect.h"
#include "detect-engine-mpm.h"

Include dependency graph for detect-parse.h:

Data Structures
struct	DetectFileHandlerTableElmt_

struct	DetectParseRegex

Macros
#define	MAX_DETECT_ALPROTO_CNT 10

Typedefs
typedef struct DetectFileHandlerTableElmt_	DetectFileHandlerTableElmt

typedef struct DetectParseRegex	DetectParseRegex

Enumerations
enum	{ SIG_DIREC_NORMAL, SIG_DIREC_SWITCHED }

enum	{ SIG_DIREC_SRC, SIG_DIREC_DST }

Functions
void	DetectFileRegisterFileProtocols (DetectFileHandlerTableElmt *entry)

int	SignatureInitDataBufferCheckExpand (Signature *s)
	check if buffers array still has space left, expand if not More...

Signature *	SigAlloc (void)

void	SigFree (DetectEngineCtx de_ctx, Signature s)

Signature *	SigInit (DetectEngineCtx , const char sigstr)
	Parses a signature and adds it to the Detection Engine Context. More...

SigMatchData *	SigMatchList2DataArray (SigMatch *head)
	convert SigMatch list to SigMatchData array More...

void	SigParseRegisterTests (void)

Signature *	DetectEngineAppendSig (DetectEngineCtx , const char )
	Parse and append a Signature into the Detection Engine Context signature list. More...

SigMatch *	SigMatchAppendSMToList (DetectEngineCtx , Signature , uint16_t, SigMatchCtx *, int)
	Append a SigMatch to the list type. More...

void	SigMatchRemoveSMFromList (Signature , SigMatch , int)

int	SigMatchListSMBelongsTo (const Signature , const SigMatch )

int	DetectParseDupSigHashInit (DetectEngineCtx *)
	Initializes the hash table that is used to cull duplicate sigs. More...

void	DetectParseDupSigHashFree (DetectEngineCtx *)
	Frees the hash table that is used to cull duplicate sigs. More...

int	DetectEngineContentModifierBufferSetup (DetectEngineCtx de_ctx, Signature s, const char *arg, int sm_type, int sm_list, AppProto alproto)

bool	SigMatchSilentErrorEnabled (const DetectEngineCtx *de_ctx, const enum DetectKeywordId id)

bool	SigMatchStrictEnabled (const enum DetectKeywordId id)

const char *	DetectListToHumanString (int list)

const char *	DetectListToString (int list)

void	SigTableApplyStrictCommandLineOption (const char *str)

SigMatch *	DetectGetLastSM (const Signature *)
	Returns the sm with the largest index (added latest) from this sig. More...

SigMatch *	DetectGetLastSMFromMpmLists (const DetectEngineCtx de_ctx, const Signature s)
	get the last SigMatch from lists that support MPM. More...

SigMatch *	DetectGetLastSMFromLists (const Signature *s,...)
	Returns the sm with the largest index (added latest) from the lists passed to us. More...

SigMatch *	DetectGetLastSMByListPtr (const Signature s, SigMatch sm_list,...)
	Returns the sm with the largest index (added last) from the list passed to us as a pointer. More...

SigMatch *	DetectGetLastSMByListId (const Signature *s, int list_id,...)
	Returns the sm with the largest index (added last) from the list passed to us as an id. More...

int	DetectSignatureAddTransform (Signature s, int transform, void options)

int WARN_UNUSED	DetectSignatureSetAppProto (Signature *s, AppProto alproto)

DetectParseRegex *	DetectSetupPCRE2 (const char *parse_str, int opts)

bool	DetectSetupParseRegexesOpts (const char parse_str, DetectParseRegex parse_regex, int opts)

void	DetectSetupParseRegexes (const char parse_str, DetectParseRegex parse_regex)

void	DetectParseRegexAddToFreeList (DetectParseRegex *parse_regex)
	add regex and/or study to at exit free list More...

void	DetectParseFreeRegexes (void)

void	DetectParseFreeRegex (DetectParseRegex *r)

int	DetectParsePcreExec (DetectParseRegex parse_regex, pcre2_match_data match, const char str, int start_offset, int options)

int	SC_Pcre2SubstringCopy (pcre2_match_data match_data, uint32_t number, PCRE2_UCHAR buffer, PCRE2_SIZE *bufflen)

int	SC_Pcre2SubstringGet (pcre2_match_data match_data, uint32_t number, PCRE2_UCHAR bufferptr, PCRE2_SIZE bufflen)

Variables
DetectFileHandlerTableElmt	filehandler_table [DETECT_TBLSIZE_STATIC]

Detailed Description

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

Definition in file detect-parse.h.

Macro Definition Documentation

◆ MAX_DETECT_ALPROTO_CNT

#define MAX_DETECT_ALPROTO_CNT 10

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

Typedef Documentation

◆ DetectFileHandlerTableElmt

typedef struct DetectFileHandlerTableElmt_ DetectFileHandlerTableElmt

◆ DetectParseRegex

typedef struct DetectParseRegex DetectParseRegex

Enumeration Type Documentation

◆ anonymous enum

anonymous enum

Flags to indicate if the Signature parsing must be done switching the source and dest (for ip addresses and ports) or otherwise as normal

Enumerator
SIG_DIREC_NORMAL
SIG_DIREC_SWITCHED

Definition at line 50 of file detect-parse.h.

◆ anonymous enum

anonymous enum

Flags to indicate if are referencing the source of the Signature or the destination (for ip addresses and ports)

Enumerator
SIG_DIREC_SRC
SIG_DIREC_DST

Definition at line 57 of file detect-parse.h.

Function Documentation

◆ DetectEngineAppendSig()

Signature* DetectEngineAppendSig	(	DetectEngineCtx *	de_ctx,
		const char *	sigstr
	)

Parse and append a Signature into the Detection Engine Context signature list.

If the signature is bidirectional it should append two signatures (with the addresses switched) into the list. Also handle duplicate signatures. In case of duplicate sigs, use the ones that have the latest revision. We use the sid and the msg to identify duplicate sigs. If 2 sigs have the same sid and gid, they are duplicates.

Parameters

de_ctx	Pointer to the Detection Engine Context.
sigstr	Pointer to a character string containing the signature to be parsed.
sig_file	Pointer to a character string containing the filename from which signature is read
lineno	Line number from where signature is read

Return values

Pointer to the head Signature in the detection engine ctx sig_list on success; NULL on failure.

In DetectEngineAppendSig(), the signatures are prepended and we always return the first one so if the signature is bidirectional, the returned sig will point through "next" ptr to the cloned signatures with the switched addresses

Definition at line 2616 of file detect-parse.c.

References de_ctx, and SigInit().

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◆ DetectEngineContentModifierBufferSetup()

int DetectEngineContentModifierBufferSetup	(	DetectEngineCtx *	de_ctx,
		Signature *	s,
		const char *	arg,
		int	sm_type,
		int	sm_list,
		AppProto	alproto
	)

Parameters

arg	NULL or empty string

Definition at line 221 of file detect-parse.c.

References Signature_::alproto, ALPROTO_UNKNOWN, DETECT_SM_LIST_NOTSET, Signature_::init_data, SignatureInitData_::list, name, SCLogError, and sigmatch_table.

Referenced by DetectHttpUriSetup().

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◆ DetectFileRegisterFileProtocols()

void DetectFileRegisterFileProtocols ( DetectFileHandlerTableElmt * entry )

Definition at line 126 of file detect-parse.c.

References al_protocols, DetectFileHandlerProtocol_t::alproto, ALPROTO_UNKNOWN, DetectFileHandlerTableElmt_::Callback, DetectAppLayerInspectEngineRegister(), DetectAppLayerMpmRegister(), DetectFileHandlerProtocol_t::direction, g_alproto_max, DetectFileHandlerTableElmt_::GetData, DetectFileHandlerTableElmt_::name, DetectFileHandlerTableElmt_::PrefilterFn, DetectFileHandlerTableElmt_::priority, SIG_FLAG_TOCLIENT, SIG_FLAG_TOSERVER, DetectFileHandlerProtocol_t::to_client_progress, and DetectFileHandlerProtocol_t::to_server_progress.

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◆ DetectGetLastSM()

SigMatch* DetectGetLastSM ( const Signature * s )

Returns the sm with the largest index (added latest) from this sig.

Return values

sm_last Pointer to last sm

Definition at line 778 of file detect-parse.c.

References SignatureInitData_::buffer_index, SignatureInitData_::buffers, DETECT_SM_LIST_MAX, SigMatch_::idx, Signature_::init_data, SignatureInitData_::smlists_tail, and SignatureInitDataBuffer_::tail.

◆ DetectGetLastSMByListId()

SigMatch* DetectGetLastSMByListId	(	const Signature *	s,
		int	list_id,
			...
	)

Returns the sm with the largest index (added last) from the list passed to us as an id.

Parameters

list_id	id of the list to be searched
va_args	list of keyword types terminated by -1

Return values

sm_last to last sm.

Definition at line 727 of file detect-parse.c.

References SignatureInitData_::buffer_index, SignatureInitData_::buffers, DETECT_SM_LIST_MAX, Signature_::init_data, and SignatureInitDataBuffer_::tail.

◆ DetectGetLastSMByListPtr()

SigMatch* DetectGetLastSMByListPtr	(	const Signature *	s,
		SigMatch *	sm_list,
			...
	)

Returns the sm with the largest index (added last) from the list passed to us as a pointer.

Parameters

sm_list	pointer to the SigMatch we should look before
va_args	list of keyword types terminated by -1

Return values

sm_last to last sm.

Definition at line 695 of file detect-parse.c.

Referenced by DetectGetLastSMFromMpmLists().

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◆ DetectGetLastSMFromLists()

SigMatch* DetectGetLastSMFromLists	(	const Signature *	s,
			...
	)

Returns the sm with the largest index (added latest) from the lists passed to us.

Return values

Pointer to Last sm.

Definition at line 633 of file detect-parse.c.

References SignatureInitData_::buffer_index, SignatureInitData_::buffers, DETECT_SM_LIST_NOTSET, SignatureInitDataBuffer_::id, Signature_::init_data, SignatureInitData_::list, and SCLogDebug.

◆ DetectGetLastSMFromMpmLists()

SigMatch* DetectGetLastSMFromMpmLists	(	const DetectEngineCtx *	de_ctx,
		const Signature *	s
	)

get the last SigMatch from lists that support MPM.

Note: only supports the lists that are registered through DetectBufferTypeSupportsMpm().

Definition at line 596 of file detect-parse.c.

References SignatureInitData_::buffer_index, SignatureInitData_::buffers, de_ctx, DETECT_CONTENT, DETECT_SM_LIST_MAX, DetectEngineBufferTypeSupportsMpmGetById(), DetectGetLastSMByListPtr(), SignatureInitDataBuffer_::id, SigMatch_::idx, Signature_::init_data, SignatureInitData_::smlists_tail, and SignatureInitDataBuffer_::tail.

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◆ DetectListToHumanString()

const char* DetectListToHumanString ( int list )

Definition at line 187 of file detect-parse.c.

Referenced by DumpPatterns().

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◆ DetectListToString()

const char* DetectListToString ( int list )

Definition at line 205 of file detect-parse.c.

◆ DetectParseDupSigHashFree()

void DetectParseDupSigHashFree ( DetectEngineCtx * de_ctx )

Frees the hash table that is used to cull duplicate sigs.

Parameters

de_ctx Pointer to the detection engine context that holds this table.

Definition at line 2438 of file detect-parse.c.

References de_ctx, DetectEngineCtx_::dup_sig_hash_table, and HashListTableFree().

Referenced by DetectEngineCtxFree().

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◆ DetectParseDupSigHashInit()

int DetectParseDupSigHashInit ( DetectEngineCtx * de_ctx )

Initializes the hash table that is used to cull duplicate sigs.

Parameters

de_ctx Pointer to the detection engine context.

Return values

0	On success.
-1	On failure.

Definition at line 2421 of file detect-parse.c.

References de_ctx, DetectEngineCtx_::dup_sig_hash_table, and HashListTableInit().

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◆ DetectParseFreeRegex()

void DetectParseFreeRegex ( DetectParseRegex * r )

Definition at line 2680 of file detect-parse.c.

References DetectParseRegex::context, and DetectParseRegex::regex.

◆ DetectParseFreeRegexes()

void DetectParseFreeRegexes ( void )

Definition at line 2690 of file detect-parse.c.

Referenced by GlobalsDestroy().

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◆ DetectParsePcreExec()

int DetectParsePcreExec	(	DetectParseRegex *	parse_regex,
		pcre2_match_data **	match,
		const char *	str,
		int	start_offset,
		int	options
	)

Definition at line 2670 of file detect-parse.c.

◆ DetectParseRegexAddToFreeList()

void DetectParseRegexAddToFreeList ( DetectParseRegex * parse_regex )

add regex and/or study to at exit free list

Definition at line 2706 of file detect-parse.c.

References FatalError, DetectParseRegex::next, DetectParseRegex::regex, and SCCalloc.

Referenced by DetectSetupParseRegexesOpts().

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◆ DetectSetupParseRegexes()

void DetectSetupParseRegexes	(	const char *	parse_str,
		DetectParseRegex *	parse_regex
	)

Definition at line 2796 of file detect-parse.c.

References DetectSetupParseRegexesOpts(), and FatalError.

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◆ DetectSetupParseRegexesOpts()

bool DetectSetupParseRegexesOpts	(	const char *	parse_str,
		DetectParseRegex *	parse_regex,
		int	opts
	)

Definition at line 2717 of file detect-parse.c.

References DetectParseRegex::context, DetectParseRegexAddToFreeList(), DetectParseRegex::regex, SC_MATCH_LIMIT_DEFAULT, SC_MATCH_LIMIT_RECURSION_DEFAULT, and SCLogError.

Referenced by DetectSetupParseRegexes().

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◆ DetectSetupPCRE2()

DetectParseRegex* DetectSetupPCRE2	(	const char *	parse_str,
		int	opts
	)

Definition at line 2746 of file detect-parse.c.

References DetectParseRegex::next, DetectParseRegex::regex, SCCalloc, SCFree, and SCLogError.

◆ DetectSignatureAddTransform()

int DetectSignatureAddTransform	(	Signature *	s,
		int	transform,
		void *	options
	)

Definition at line 1739 of file detect-parse.c.

References DetectEngineTransforms::cnt, DETECT_TRANSFORMS_MAX, Signature_::init_data, SignatureInitData_::list, SignatureInitData_::list_set, TransformData_::options, SCLogDebug, SCLogError, SCReturnInt, Signature_::sig_str, TransformData_::transform, DetectEngineTransforms::transforms, and SignatureInitData_::transforms.

◆ DetectSignatureSetAppProto()

int WARN_UNUSED DetectSignatureSetAppProto	(	Signature *	s,
		AppProto	alproto
	)

Definition at line 1764 of file detect-parse.c.

◆ SC_Pcre2SubstringCopy()

int SC_Pcre2SubstringCopy	(	pcre2_match_data *	match_data,
		uint32_t	number,
		PCRE2_UCHAR *	buffer,
		PCRE2_SIZE *	bufflen
	)

Definition at line 2772 of file detect-parse.c.

◆ SC_Pcre2SubstringGet()

int SC_Pcre2SubstringGet	(	pcre2_match_data *	match_data,
		uint32_t	number,
		PCRE2_UCHAR **	bufferptr,
		PCRE2_SIZE *	bufflen
	)

Definition at line 2784 of file detect-parse.c.

◆ SigAlloc()

Signature* SigAlloc ( void )

Definition at line 1540 of file detect-parse.c.

References SignatureInitData_::buffers, SignatureInitData_::buffers_size, DETECT_SM_LIST_NOTSET, Signature_::init_data, SignatureInitData_::list, SignatureInitData_::mpm_sm_list, Signature_::prio, SCCalloc, SCFree, and unlikely.

◆ SigFree()

void SigFree	(	DetectEngineCtx *	de_ctx,
		Signature *	s
	)

Definition at line 1655 of file detect-parse.c.

References SignatureInitData_::buffer_index, SignatureInitData_::buffers, SignatureInitData_::cidr_dst, SignatureInitData_::cidr_src, DetectEngineTransforms::cnt, de_ctx, DETECT_SM_LIST_MAX, SigTableElmt_::Free, SignatureInitDataBuffer_::head, Signature_::init_data, IPOnlyCIDRListFree(), SigMatch_::next, TransformData_::options, SCFree, sigmatch_table, SigMatchFree(), SignatureInitData_::smlists, TransformData_::transform, DetectEngineTransforms::transforms, and SignatureInitData_::transforms.

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◆ SigInit()

Signature* SigInit	(	DetectEngineCtx *	de_ctx,
		const char *	sigstr
	)

Parses a signature and adds it to the Detection Engine Context.

Parameters

de_ctx	Pointer to the Detection Engine Context.
sigstr	Pointer to a character string containing the signature to be parsed.

Return values

Pointer to the Signature instance on success; NULL on failure.

Definition at line 2314 of file detect-parse.c.

References de_ctx, SCEnter, DetectEngineCtx_::sigerror_ok, DetectEngineCtx_::sigerror_requires, DetectEngineCtx_::sigerror_silent, and DetectEngineCtx_::signum.

Referenced by DetectEngineAppendSig(), LLVMFuzzerTestOneInput(), UTHPacketMatchSig(), and UTHPacketMatchSigMpm().

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◆ SigMatchAppendSMToList()

SigMatch* SigMatchAppendSMToList	(	DetectEngineCtx *	de_ctx,
		Signature *	s,
		uint16_t	type,
		SigMatchCtx *	ctx,
		const int	list
	)

Append a SigMatch to the list type.

Parameters

s	Signature.
new	The sig match to append.
list	The list to append to.

Definition at line 463 of file detect-parse.c.

Referenced by DetectContentSetup(), and DetectFlowvarPostMatchSetup().

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◆ SigMatchList2DataArray()

SigMatchData* SigMatchList2DataArray ( SigMatch * head )

convert SigMatch list to SigMatchData array

Note: ownership of sm->ctx is transferred to smd->ctx

Definition at line 1882 of file detect-parse.c.

References len.

Referenced by DetectEngineAppInspectionEngine2Signature().

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◆ SigMatchListSMBelongsTo()

int SigMatchListSMBelongsTo	(	const Signature *	,
		const SigMatch *
	)

Definition at line 832 of file detect-parse.c.

References SignatureInitData_::buffer_index, SignatureInitData_::buffers, SignatureInitDataBuffer_::head, SignatureInitDataBuffer_::id, Signature_::init_data, and SigMatch_::next.

◆ SigMatchRemoveSMFromList()

void SigMatchRemoveSMFromList	(	Signature *	,
		SigMatch *	,
		int
	)

Definition at line 556 of file detect-parse.c.

References Signature_::init_data, SigMatch_::next, SigMatch_::prev, SignatureInitData_::smlists, and SignatureInitData_::smlists_tail.

Referenced by DetectIPProtoRemoveAllSMs().

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◆ SigMatchSilentErrorEnabled()

bool SigMatchSilentErrorEnabled	(	const DetectEngineCtx *	de_ctx,
		const enum DetectKeywordId	id
	)

Definition at line 405 of file detect-parse.c.

References de_ctx, and DetectEngineCtx_::sm_types_silent_error.

◆ SigMatchStrictEnabled()

bool SigMatchStrictEnabled ( const enum DetectKeywordId id )

Definition at line 411 of file detect-parse.c.

References DETECT_TBLSIZE, flags, SIGMATCH_STRICT_PARSING, and sigmatch_table.

◆ SignatureInitDataBufferCheckExpand()

int SignatureInitDataBufferCheckExpand ( Signature * s )

check if buffers array still has space left, expand if not

Definition at line 1520 of file detect-parse.c.

References SignatureInitData_::buffer_index, SignatureInitData_::buffers, SignatureInitData_::buffers_size, Signature_::init_data, and SCRealloc.

Referenced by DetectBufferGetActiveList().

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◆ SigParseRegisterTests()

void SigParseRegisterTests ( void )

Definition at line 4474 of file detect-parse.c.

References DetectParseRegisterTests(), and UtRegisterTest().

Referenced by SigRegisterTests().

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◆ SigTableApplyStrictCommandLineOption()

void SigTableApplyStrictCommandLineOption ( const char * str )

Definition at line 419 of file detect-parse.c.

References DETECT_TBLSIZE, FatalError, SigTableElmt_::flags, SCStrdup, SIGMATCH_STRICT_PARSING, sigmatch_table, and str.

Variable Documentation

◆ filehandler_table

DetectFileHandlerTableElmt filehandler_table[DETECT_TBLSIZE_STATIC]

Definition at line 88 of file detect-parse.c.

Data Structures

Macros

Typedefs

Enumerations

Functions

Variables

Detailed Description

Macro Definition Documentation

◆ MAX_DETECT_ALPROTO_CNT

Typedef Documentation

◆ DetectFileHandlerTableElmt

◆ DetectParseRegex

Enumeration Type Documentation

◆ anonymous enum

◆ anonymous enum

Function Documentation

◆ DetectEngineAppendSig()

◆ DetectEngineContentModifierBufferSetup()

◆ DetectFileRegisterFileProtocols()

◆ DetectGetLastSM()

◆ DetectGetLastSMByListId()

◆ DetectGetLastSMByListPtr()

◆ DetectGetLastSMFromLists()

◆ DetectGetLastSMFromMpmLists()

◆ DetectListToHumanString()

◆ DetectListToString()

◆ DetectParseDupSigHashFree()

◆ DetectParseDupSigHashInit()

◆ DetectParseFreeRegex()

◆ DetectParseFreeRegexes()

◆ DetectParsePcreExec()

◆ DetectParseRegexAddToFreeList()

◆ DetectSetupParseRegexes()

◆ DetectSetupParseRegexesOpts()

◆ DetectSetupPCRE2()

◆ DetectSignatureAddTransform()

◆ DetectSignatureSetAppProto()

◆ SC_Pcre2SubstringCopy()

◆ SC_Pcre2SubstringGet()

◆ SigAlloc()

◆ SigFree()

◆ SigInit()

◆ SigMatchAppendSMToList()

◆ SigMatchList2DataArray()

◆ SigMatchListSMBelongsTo()

◆ SigMatchRemoveSMFromList()

◆ SigMatchSilentErrorEnabled()

◆ SigMatchStrictEnabled()

◆ SignatureInitDataBufferCheckExpand()

◆ SigParseRegisterTests()

◆ SigTableApplyStrictCommandLineOption()

Variable Documentation

◆ filehandler_table