detect-bytetest.c File Reference

#include "suricata-common.h"
#include "decode.h"
#include "detect.h"
#include "detect-engine.h"
#include "detect-engine-buffer.h"
#include "detect-parse.h"
#include "detect-engine-build.h"
#include "detect-content.h"
#include "detect-uricontent.h"
#include "detect-byte.h"
#include "detect-bytetest.h"
#include "detect-bytejump.h"
#include "detect-byte-extract.h"
#include "app-layer.h"
#include "util-byte.h"
#include "util-unittest.h"
#include "util-debug.h"
#include "detect-pcre.h"
#include "util-unittest-helper.h"
#include "app-layer-parser.h"
#include "flow-util.h"

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Macros
#define	VALID_KW   "relative|big|little|string|oct|dec|hex|dce|bitmask"
	Regex for parsing our options.
#define	PARSE_REGEX

Functions
void	DetectBytetestRegister (void)
int	DetectBytetestDoMatch (DetectEngineThreadCtx *det_ctx, const Signature *s, const SigMatchCtx *ctx, const uint8_t *payload, uint32_t payload_len, uint16_t flags, int32_t offset, int32_t nbytes, uint64_t value)
	Bytetest detection code.

Detailed Description

Author

Brian Rectanus brect.nosp@m.anu@.nosp@m.gmail.nosp@m..com

Jeff Lucovsky jeff@.nosp@m.luco.nosp@m.vsky..nosp@m.org

Implements byte_test keyword.

Definition in file detect-bytetest.c.

Macro Definition Documentation

PARSE_REGEX

#define PARSE_REGEX

Value:

                     "^\\s*" \
                     "([^\\s,]+)\\s*,\\s*" \
                     "(\\!?\\s*[^\\s,]*)" \
                     "\\s*,\\s*([^\\s,]+\\s*,\\s*[^\\s,]+)" \
                     "(?:\\s*,\\s*((?:"VALID_KW")\\s+[^\\s,]+|["VALID_KW"]+))?" \
                     "(?:\\s*,\\s*((?:"VALID_KW")\\s+[^\\s,]+|["VALID_KW"]+))?" \
                     "(?:\\s*,\\s*((?:"VALID_KW")\\s+[^\\s,]+|["VALID_KW"]+))?" \
                     "(?:\\s*,\\s*((?:"VALID_KW")\\s+[^\\s,]+|["VALID_KW"]+))?" \
                     "(?:\\s*,\\s*((?:"VALID_KW")\\s+[^\\s,]+|["VALID_KW"]+))?" \
                     "(?:\\s*,\\s*((?:"VALID_KW")\\s+[^\\s,]+|["VALID_KW"]+))?" \
                     "\\s*$"

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

VALID_KW

#define VALID_KW   "relative|big|little|string|oct|dec|hex|dce|bitmask"

Regex for parsing our options.

Todo:

We probably just need a simple tokenizer here

Definition at line 57 of file detect-bytetest.c.

Function Documentation

DetectBytetestDoMatch()

int DetectBytetestDoMatch	(	DetectEngineThreadCtx *	det_ctx,
		const Signature *	s,
		const SigMatchCtx *	ctx,
		const uint8_t *	payload,
		uint32_t	payload_len,
		uint16_t	flags,
		int32_t	offset,
		int32_t	nbytes,
		uint64_t	value
	)

Bytetest detection code.

Byte test works on the packet payload.

Parameters

det_ctx	thread de ctx
s	signature
m	sigmatch for this bytetest
payload	ptr to the start of the buffer to inspect
payload_len	length of the payload

Return values

1	match
0	no match

Definition at line 155 of file detect-bytetest.c.

References DetectBytetestData_::base, DetectBytetestData_::bitmask, DetectBytetestData_::bitmask_shift_count, DetectEngineThreadCtx_::buffer_offset, BYTE_BIG_ENDIAN, BYTE_LITTLE_ENDIAN, ByteExtractStringUint64(), ByteExtractUint64(), ctx, DETECT_BYTETEST_BITMASK, DETECT_BYTETEST_LITTLE, DETECT_BYTETEST_NBYTES_VAR, DETECT_BYTETEST_OP_AND, DETECT_BYTETEST_OP_EQ, DETECT_BYTETEST_OP_GE, DETECT_BYTETEST_OP_GT, DETECT_BYTETEST_OP_LE, DETECT_BYTETEST_OP_LT, DETECT_BYTETEST_OP_OR, DETECT_BYTETEST_RELATIVE, DETECT_BYTETEST_STRING, flags, DetectBytetestData_::flags, len, DetectBytetestData_::neg_op, DetectBytetestData_::offset, offset, DetectBytetestData_::op, payload_len, SCEnter, SCLogDebug, SCReturnInt, and DetectBytetestData_::value.

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DetectBytetestRegister()

void DetectBytetestRegister

(

void

)

Registration function for byte_test.

Todo:

add support for no_stream and stream_only

Definition at line 78 of file detect-bytetest.c.

References SigTableElmt_::desc, DETECT_BYTETEST, DetectSetupParseRegexes(), SigTableElmt_::Free, SigTableElmt_::name, PARSE_REGEX, SigTableElmt_::RegisterTests, SigTableElmt_::Setup, sigmatch_table, and SigTableElmt_::url.

Referenced by SigTableSetup().

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