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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 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 "flow-var.h"
#include "detect-content.h"
#include "detect-pcre.h"
#include "util-debug.h"
static int DetectRawbytesSetup (DetectEngineCtx *, Signature *, char *);
void DetectRawbytesRegister (void)
{
sigmatch_table[DETECT_RAWBYTES].name = "rawbytes";
sigmatch_table[DETECT_RAWBYTES].Match = NULL;
sigmatch_table[DETECT_RAWBYTES].Setup = DetectRawbytesSetup;
sigmatch_table[DETECT_RAWBYTES].Free = NULL;
sigmatch_table[DETECT_RAWBYTES].RegisterTests = NULL;
sigmatch_table[DETECT_RAWBYTES].flags |= SIGMATCH_NOOPT;
sigmatch_table[DETECT_RAWBYTES].flags |= SIGMATCH_PAYLOAD;
}
static int DetectRawbytesSetup (DetectEngineCtx *de_ctx, Signature *s, char *nullstr)
{
SCEnter();
if (nullstr != NULL) {
SCLogError(SC_ERR_INVALID_VALUE, "rawbytes has no value");
return -1;
}
if (s->list != DETECT_SM_LIST_NOTSET) {
SCLogError(SC_ERR_RAWBYTES_FILE_DATA, "\"rawbytes\" cannot be combined with \"file_data\"");
SCReturnInt(-1);
}
SigMatch *pm = SigMatchGetLastSMFromLists(s, 2,
DETECT_CONTENT, s->sm_lists_tail[DETECT_SM_LIST_PMATCH]);
if (pm == NULL) {
SCLogError(SC_ERR_RAWBYTES_MISSING_CONTENT, "\"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(SC_ERR_INVALID_SIGNATURE, "can't use multiple rawbytes modifiers for the same content. ");
SCReturnInt(-1);
}
cd->flags |= DETECT_CONTENT_RAWBYTES;
break;
}
default:
SCLogError(SC_ERR_RAWBYTES_MISSING_CONTENT, "\"rawbytes\" needs a preceding content option");
SCReturnInt(-1);
}
SCReturnInt(0);
}
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