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/* Copyright (C) 2007-2010 Open Information Security Foundation
*
* You can copy, redistribute or modify this Program under the terms of
* the GNU General Public License version 2 as published by the Free
* Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* version 2 along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA.
*/
/**
* \file
*
* \author Victor Julien <victor@inliniac.net>
*
* Implements the nocase keyword
*/
#include "suricata-common.h"
#include "suricata.h"
#include "decode.h"
#include "detect.h"
#include "detect-parse.h"
#include "detect-content.h"
#include "detect-nocase.h"
#include "util-debug.h"
static int DetectNocaseSetup (DetectEngineCtx *, Signature *, const char *);
void DetectNocaseRegister(void)
{
sigmatch_table[DETECT_NOCASE].name = "nocase";
sigmatch_table[DETECT_NOCASE].desc = "modify content match to be case insensitive";
sigmatch_table[DETECT_NOCASE].url = "/rules/payload-keywords.html#nocase";
sigmatch_table[DETECT_NOCASE].Setup = DetectNocaseSetup;
sigmatch_table[DETECT_NOCASE].flags |= SIGMATCH_NOOPT;
}
/**
* \internal
* \brief Apply the nocase keyword to the last pattern match, either content or uricontent
* \param det_ctx detection engine ctx
* \param s signature
* \param nullstr should be null
* \retval 0 ok
* \retval -1 failure
*/
static int DetectNocaseSetup (DetectEngineCtx *de_ctx, Signature *s, const char *nullstr)
{
SCEnter();
SigMatch *pm = NULL;
int ret = -1;
if (nullstr != NULL) {
SCLogError("nocase has value");
goto end;
}
/* retrieve the sm to apply the nocase against */
pm = DetectGetLastSMFromLists(s, DETECT_CONTENT, -1);
if (pm == NULL) {
SCLogError("nocase needs "
"preceding content option");
goto end;
}
DetectContentData *cd = (DetectContentData *)pm->ctx;
ret = DetectContentConvertToNocase(de_ctx, cd);
end:
SCReturnInt(ret);
}
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