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suricata/src/detect-nocase.c

76 lines
1.8 KiB
C

/* NOCASE part of the detection engine. */
#include "suricata-common.h"
#include "decode.h"
#include "detect.h"
#include "detect-parse.h"
#include "flow-var.h"
#include "detect-content.h"
#include "detect-uricontent.h"
#include "detect-pcre.h"
#include "util-debug.h"
static int DetectNocaseSetup (DetectEngineCtx *, Signature *, char *);
void DetectNocaseRegister (void) {
sigmatch_table[DETECT_NOCASE].name = "nocase";
sigmatch_table[DETECT_NOCASE].Match = NULL;
sigmatch_table[DETECT_NOCASE].Setup = DetectNocaseSetup;
sigmatch_table[DETECT_NOCASE].Free = NULL;
sigmatch_table[DETECT_NOCASE].RegisterTests = NULL;
sigmatch_table[DETECT_NOCASE].flags |= SIGMATCH_NOOPT;
sigmatch_table[DETECT_NOCASE].flags |= SIGMATCH_PAYLOAD;
}
/** \todo uricontent needs fixing */
static int DetectNocaseSetup (DetectEngineCtx *de_ctx, Signature *s, char *nullstr)
{
SCEnter();
int ret = 0;
if (nullstr != NULL) {
SCLogError(SC_ERR_INVALID_VALUE, "nocase has no value");
SCReturnInt(-1);
}
SigMatch *co_sm = DetectContentFindPrevApplicableSM(s->pmatch_tail);
SigMatch *ur_sm = SigMatchGetLastSM(s->match, DETECT_URICONTENT);
char uri = 0;
if (co_sm != NULL && ur_sm != NULL) {
BUG_ON(co_sm->idx == ur_sm->idx);
if (co_sm->idx > ur_sm->idx)
uri = 0;
else
uri = 1;
} else if (co_sm != NULL) {
uri = 0;
} else if (ur_sm != NULL) {
uri = 1;
} else {
SCReturnInt(-1);
}
if (uri == 0) {
DetectContentData *cd = (DetectContentData *)co_sm->ctx;
cd->flags |= DETECT_CONTENT_NOCASE;
goto end;
} else {
DetectUricontentData *cd = (DetectUricontentData *)ur_sm->ctx;
cd->flags |= DETECT_URICONTENT_NOCASE;
goto end;
}
ret = -1;
end:
SCReturnInt(ret);
}