/*
 * tvants.c
 *
 * Copyright (C) 2009-2011 by ipoque GmbH
 * Copyright (C) 2011-20 - ntop.org
 *
 * This file is part of nDPI, an open source deep packet inspection
 * library based on the OpenDPI and PACE technology by ipoque GmbH
 *
 * nDPI 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.
 *
 * nDPI 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
 * along with nDPI.  If not, see <http://www.gnu.org/licenses/>.
 *
 */

#include "ndpi_protocol_ids.h"

#define NDPI_CURRENT_PROTO NDPI_PROTOCOL_TVANTS

#include "ndpi_api.h"

static void ndpi_int_tvants_add_connection(struct ndpi_detection_module_struct
                                           *ndpi_struct, struct ndpi_flow_struct *flow)
{
    ndpi_set_detected_protocol(ndpi_struct, flow, NDPI_PROTOCOL_TVANTS, NDPI_PROTOCOL_UNKNOWN);
}

void ndpi_search_tvants_udp(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 tvants.  \n");

    if (packet->udp != NULL && packet->payload_packet_len > 57
            && packet->payload[0] == 0x04 && packet->payload[1] == 0x00
            && (packet->payload[2] == 0x05 || packet->payload[2] == 0x06
                || packet->payload[2] == 0x07) && packet->payload[3] == 0x00
            && packet->payload_packet_len == (packet->payload[5] << 8) + packet->payload[4]
            && packet->payload[6] == 0x00 && packet->payload[7] == 0x00
            && (memcmp(&packet->payload[48], "TVANTS", 6) == 0
                || memcmp(&packet->payload[49], "TVANTS", 6) == 0 || memcmp(&packet->payload[51], "TVANTS", 6) == 0)) {

        NDPI_LOG_INFO(ndpi_struct, "found tvants over udp.  \n");
        ndpi_int_tvants_add_connection(ndpi_struct, flow);

    } else if (packet->tcp != NULL && packet->payload_packet_len > 15
               && packet->payload[0] == 0x04 && packet->payload[1] == 0x00
               && packet->payload[2] == 0x07 && packet->payload[3] == 0x00
               && packet->payload_packet_len == (packet->payload[5] << 8) + packet->payload[4]
               && packet->payload[6] == 0x00 && packet->payload[7] == 0x00
               && memcmp(&packet->payload[8], "TVANTS", 6) == 0) {

        NDPI_LOG_INFO(ndpi_struct, "found tvants over tcp.  \n");
        ndpi_int_tvants_add_connection(ndpi_struct, flow);

    }
    NDPI_EXCLUDE_PROTO(ndpi_struct, flow);

}


void init_tvants_dissector(struct ndpi_detection_module_struct *ndpi_struct, u_int32_t *id, NDPI_PROTOCOL_BITMASK *detection_bitmask)
{
    ndpi_set_bitmask_protocol_detection("Tvants", ndpi_struct, detection_bitmask, *id,
                                        NDPI_PROTOCOL_TVANTS,
                                        ndpi_search_tvants_udp,
                                        NDPI_SELECTION_BITMASK_PROTOCOL_V4_V6_TCP_OR_UDP_WITH_PAYLOAD,
                                        SAVE_DETECTION_BITMASK_AS_UNKNOWN,
                                        ADD_TO_DETECTION_BITMASK);

    *id += 1;
}
