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/* Copyright (C) 2007-2018 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 rawbytes keyword support
*
* \todo Provide un-normalized telnet dce/rpc buffers to match on
*/
#include "suricata-common.h"
#include "decode.h"
#include "detect.h"
#include "detect-parse.h"
#include "detect-rawbytes.h"
#include "detect-engine.h"
#include "detect-content.h"
#include "detect-pcre.h"
#include "util-debug.h"
static int DetectRawbytesSetup(DetectEngineCtx *, Signature *, const char *);
void DetectRawbytesRegister(void)
{
sigmatch_table[DETECT_RAWBYTES].name = "rawbytes";
sigmatch_table[DETECT_RAWBYTES].desc =
"dummy keyword to be compatible with snort signatures without effect";
sigmatch_table[DETECT_RAWBYTES].url = "/rules/payload-keywords.html#rawbytes";
sigmatch_table[DETECT_RAWBYTES].Setup = DetectRawbytesSetup;
sigmatch_table[DETECT_RAWBYTES].flags |= SIGMATCH_NOOPT;
}
static int DetectRawbytesSetup(DetectEngineCtx *de_ctx, Signature *s, const char *nullstr)
{
SCEnter();
if (nullstr != NULL) {
SCLogError("rawbytes has no value");
SCReturnInt(-1);
}
if (s->init_data->list != DETECT_SM_LIST_NOTSET) {
SCLogError("\"rawbytes\" cannot be combined "
"with the \"%s\" sticky buffer",
DetectEngineBufferTypeGetNameById(de_ctx, s->init_data->list));
SCReturnInt(-1);
}
SigMatch *pm = DetectGetLastSMByListId(s, DETECT_SM_LIST_PMATCH, DETECT_CONTENT, -1);
if (pm == NULL) {
SCLogError("\"rawbytes\" needs a preceding content option");
SCReturnInt(-1);
}
switch (pm->type) {
case DETECT_CONTENT: {
DetectContentData *cd = (DetectContentData *)pm->ctx;
if (cd->flags & DETECT_CONTENT_RAWBYTES) {
SCLogError("can't use multiple rawbytes modifiers for the same content. ");
SCReturnInt(-1);
}
cd->flags |= DETECT_CONTENT_RAWBYTES;
break;
}
default:
SCLogError("\"rawbytes\" needs a preceding content option");
SCReturnInt(-1);
}
SCReturnInt(0);
}
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