/* Copyright (C) 2020 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.

 */

/**

 *

 * \author Frank Honza <frank.honza@dcso.de>

 */

#include "suricata-common.h"

#include "threads.h"

#include "decode.h"

#include "detect.h"

#include "detect-parse.h"

#include "detect-engine.h"

#include "detect-engine-mpm.h"

#include "detect-engine-prefilter.h"

#include "detect-urilen.h"

#include "flow.h"

#include "flow-var.h"

#include "flow-util.h"

#include "util-debug.h"

#include "util-unittest.h"

#include "util-unittest-helper.h"

#include "util-spm.h"

#include "app-layer.h"

#include "app-layer-parser.h"

#include "detect-ike-key-exchange-payload.h"

#include "stream-tcp.h"

#include "rust.h"

#include "app-layer-ike.h"

#include "rust-bindings.h"

#define KEYWORD_NAME_KEY_EXCHANGE "ike.key_exchange_payload"

#define KEYWORD_DOC_KEY_EXCHANGE  "ike-keywords.html#ike-key_exchange_payload";

#define BUFFER_NAME_KEY_EXCHANGE  "ike.key_exchange_payload"

#define BUFFER_DESC_KEY_EXCHANGE  "ike key_exchange payload"

static int g_buffer_key_exchange_id = 0;

static int DetectKeyExchangeSetup(DetectEngineCtx *de_ctx, Signature *s, const char *str)

{

    if (DetectBufferSetActiveList(de_ctx, s, g_buffer_key_exchange_id) < 0)

        return -1;

    if (DetectSignatureSetAppProto(s, ALPROTO_IKE) < 0)

        return -1;

    return 0;

}

static InspectionBuffer *GetKeyExchangeData(DetectEngineThreadCtx *det_ctx,

        const DetectEngineTransforms *transforms, Flow *_f, const uint8_t _flow_flags, void *txv,

        const int list_id)

{

    InspectionBuffer *buffer = InspectionBufferGet(det_ctx, list_id);

    if (buffer->inspect == NULL) {

        const uint8_t *b = NULL;

        uint32_t b_len = 0;

        if (rs_ike_state_get_key_exchange(txv, &b, &b_len) != 1)

            return NULL;

        if (b == NULL || b_len == 0)

            return NULL;

        InspectionBufferSetup(det_ctx, list_id, buffer, b, b_len);

        InspectionBufferApplyTransforms(buffer, transforms);

    }

    return buffer;

}

void DetectIkeKeyExchangeRegister(void)

{

    // register key_exchange

    sigmatch_table[DETECT_AL_IKE_KEY_EXCHANGE].name = KEYWORD_NAME_KEY_EXCHANGE;

    sigmatch_table[DETECT_AL_IKE_KEY_EXCHANGE].url =

            "/rules/" KEYWORD_DOC_KEY_EXCHANGE sigmatch_table[DETECT_AL_IKE_KEY_EXCHANGE].desc =

                    "sticky buffer to match on the IKE key_exchange_payload";

    sigmatch_table[DETECT_AL_IKE_KEY_EXCHANGE].Setup = DetectKeyExchangeSetup;

    sigmatch_table[DETECT_AL_IKE_KEY_EXCHANGE].flags |=

            SIGMATCH_NOOPT | SIGMATCH_INFO_STICKY_BUFFER;

    DetectAppLayerInspectEngineRegister2(BUFFER_NAME_KEY_EXCHANGE, ALPROTO_IKE, SIG_FLAG_TOSERVER,

            1, DetectEngineInspectBufferGeneric, GetKeyExchangeData);

    DetectAppLayerMpmRegister2(BUFFER_NAME_KEY_EXCHANGE, SIG_FLAG_TOSERVER, 1,

            PrefilterGenericMpmRegister, GetKeyExchangeData, ALPROTO_IKE, 1);

    DetectAppLayerInspectEngineRegister2(BUFFER_NAME_KEY_EXCHANGE, ALPROTO_IKE, SIG_FLAG_TOCLIENT,

            1, DetectEngineInspectBufferGeneric, GetKeyExchangeData);

    DetectAppLayerMpmRegister2(BUFFER_NAME_KEY_EXCHANGE, SIG_FLAG_TOCLIENT, 1,

            PrefilterGenericMpmRegister, GetKeyExchangeData, ALPROTO_IKE, 1);

    DetectBufferTypeSetDescriptionByName(BUFFER_NAME_KEY_EXCHANGE, BUFFER_DESC_KEY_EXCHANGE);

    g_buffer_key_exchange_id = DetectBufferTypeGetByName(BUFFER_NAME_KEY_EXCHANGE);

    SCLogDebug("registering " BUFFER_NAME_KEY_EXCHANGE " rule option");

}