/* 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 sid keyword
 */

#include "suricata-common.h"
#include "detect.h"
#include "util-debug.h"
#include "util-error.h"

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

void DetectSidRegister (void) {
    sigmatch_table[DETECT_SID].name = "sid";
    sigmatch_table[DETECT_SID].Match = NULL;
    sigmatch_table[DETECT_SID].Setup = DetectSidSetup;
    sigmatch_table[DETECT_SID].Free = NULL;
    sigmatch_table[DETECT_SID].RegisterTests = NULL;
}

static int DetectSidSetup (DetectEngineCtx *de_ctx, Signature *s, char *sidstr)
{
    char *str = sidstr;
    char dubbed = 0;

    /* strip "'s */
    if (sidstr[0] == '\"' && sidstr[strlen(sidstr)-1] == '\"') {
        str = SCStrdup(sidstr+1);
        if (str == NULL)
            return -1;

        str[strlen(sidstr)-2] = '\0';
        dubbed = 1;
    }

    unsigned long id = 0;
    char *endptr = NULL;
    id = strtoul(sidstr, &endptr, 10);
    if (endptr == NULL || *endptr != '\0') {
        SCLogError(SC_ERR_INVALID_SIGNATURE, "Saw an invalid character as arg "
                   "to sid keyword");
        goto error;
    }
    s->id = (uint32_t)id;

    if (dubbed)
        SCFree(str);
    return 0;

 error:
    if (dubbed)
        SCFree(str);
    return -1;
}