suricata/src/detect-file-data.c

/* Copyright (C) 2007-2011 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>
 *
 */

#include "suricata-common.h"
#include "threads.h"
#include "debug.h"
#include "decode.h"

#include "detect.h"
#include "detect-parse.h"

#include "detect-engine.h"
#include "detect-engine-mpm.h"
#include "detect-engine-state.h"

#include "flow.h"
#include "flow-var.h"
#include "flow-util.h"

#include "util-debug.h"
#include "util-spm-bm.h"
#include "util-unittest.h"
#include "util-unittest-helper.h"

static int DetectFiledataSetup (DetectEngineCtx *, Signature *, char *);

/**
 * \brief Registration function for keyword: file_data
 */
void DetectFiledataRegister(void) {
    sigmatch_table[DETECT_FILE_DATA].name = "file_data";
    sigmatch_table[DETECT_FILE_DATA].Match = NULL;
    sigmatch_table[DETECT_FILE_DATA].AppLayerMatch = NULL;
    sigmatch_table[DETECT_FILE_DATA].alproto = ALPROTO_HTTP;
    sigmatch_table[DETECT_FILE_DATA].Setup = DetectFiledataSetup;
    sigmatch_table[DETECT_FILE_DATA].Free  = NULL;
    sigmatch_table[DETECT_FILE_DATA].RegisterTests = NULL;
}

/**
 * \brief this function is used to parse filedata options
 * \brief into the current signature
 *
 * \param de_ctx pointer to the Detection Engine Context
 * \param s pointer to the Current Signature
 * \param str pointer to the user provided "filestore" option
 *
 * \retval 0 on Success
 * \retval -1 on Failure
 */
static int DetectFiledataSetup (DetectEngineCtx *de_ctx, Signature *s, char *str)
{
    SCEnter();
    if (s->init_flags & SIG_FLAG_INIT_FLOW && s->flags & SIG_FLAG_TOSERVER && !(s->flags & SIG_FLAG_TOCLIENT)) {
        SCLogError(SC_ERR_INVALID_SIGNATURE, "Can't use file_data with flow:to_server or from_client with http.");
        return -1;
    }
    s->init_flags |= SIG_FLAG_INIT_FILE_DATA;

    return 0;
}