/* 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);

}