/*
 * kakaotalk_voice.c
 *
 * Copyright (C) 2015-18 - ntop.org
 *
 * This module is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This module 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 Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License.
 * If not, see <http://www.gnu.org/licenses/>.
 *
 */


/*
   KakaoTalk (call only)

http://www.kakao.com/services/talk/voices
*/
#include "ndpi_protocol_ids.h"

#define NDPI_CURRENT_PROTO NDPI_PROTOCOL_KAKAOTALK_VOICE

#include "ndpi_api.h"


void ndpi_search_kakaotalk_voice(struct ndpi_detection_module_struct *ndpi_struct, struct ndpi_flow_struct *flow) {
    struct ndpi_packet_struct *packet = &flow->packet;

    NDPI_LOG_DBG(ndpi_struct, "search kakaotalk_voice\n");

    if(packet->iph
            && packet->udp
            && (packet->payload_packet_len >= 4)
      ) {
        if((packet->payload[0] == 0x81)
                || (packet->payload[1] == 0xC8)
                || (packet->payload[2] == 0x00)
                || (packet->payload[3] == 0x0C)) {
            /* Looks good so far */

            /*
inetnum:        1.201.0.0 - 1.201.255.255
netname:        KINXINC-KR
*/

            if(((ntohl(packet->iph->saddr) & 0xFFFF0000 /* 255.255.0.0 */) == 0x01C90000 /* 1.201.0.0/16 */)
                    || ((ntohl(packet->iph->daddr) & 0xFFFF0000 /* 255.255.0.0 */) == 0x01C90000 /* 1.201.0.0/16 */)) {
                NDPI_LOG_INFO(ndpi_struct, "found kakaotalk_voice\n");
                ndpi_set_detected_protocol(ndpi_struct, flow, NDPI_PROTOCOL_KAKAOTALK_VOICE);
                return;
            }
        }
    }

    NDPI_EXCLUDE_PROTO(ndpi_struct, flow);
}


void init_kakaotalk_voice_dissector(struct ndpi_detection_module_struct *ndpi_struct,
        u_int32_t *id, NDPI_PROTOCOL_BITMASK *detection_bitmask)
{
    ndpi_set_bitmask_protocol_detection("KakaoTalk_Voice", ndpi_struct, detection_bitmask, *id,
            NDPI_PROTOCOL_KAKAOTALK_VOICE,
            ndpi_search_kakaotalk_voice,
            NDPI_SELECTION_BITMASK_PROTOCOL_V4_V6_UDP_WITH_PAYLOAD,
            SAVE_DETECTION_BITMASK_AS_UNKNOWN,
            ADD_TO_DETECTION_BITMASK);
    *id += 1;
}

