/*
 * xbox.c
 *
 * Copyright (C) 2016-18 - 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_XBOX
#include "ndpi_api.h"

static void ndpi_int_xbox_add_connection(struct ndpi_detection_module_struct
        *ndpi_struct, struct ndpi_flow_struct *flow)
{
    ndpi_set_detected_protocol(ndpi_struct, flow, NDPI_PROTOCOL_XBOX);
}

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

    /*
     * XBOX UDP DETCTION ONLY
     * the xbox TCP detection is done by http code
     * this detection also works for asymmetric xbox udp traffic
     */
    if(packet->udp != NULL) {

        u_int16_t dport = ntohs(packet->udp->dest);
        u_int16_t sport = ntohs(packet->udp->source);

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

        if (packet->payload_packet_len > 12 &&
                get_u_int32_t(packet->payload, 0) == 0 && packet->payload[5] == 0x58 &&
                memcmp(&packet->payload[7], "\x00\x00\x00", 3) == 0) {

            if ((packet->payload[4] == 0x0c && packet->payload[6] == 0x76) ||
                    (packet->payload[4] == 0x02 && packet->payload[6] == 0x18) ||
                    (packet->payload[4] == 0x0b && packet->payload[6] == 0x80) ||
                    (packet->payload[4] == 0x03 && packet->payload[6] == 0x40) ||
                    (packet->payload[4] == 0x06 && packet->payload[6] == 0x4e)) {

                ndpi_int_xbox_add_connection(ndpi_struct, flow);
                NDPI_LOG_INFO(ndpi_struct, "found xbox udp connection detected\n");
                return;
            }
        }
        if ((dport == 3074 || sport == 3074)
                && ((packet->payload_packet_len == 24 && packet->payload[0] == 0x00)
                    || (packet->payload_packet_len == 42 && packet->payload[0] == 0x4f && packet->payload[2] == 0x0a)
                    || (packet->payload_packet_len == 80 && ntohs(get_u_int16_t(packet->payload, 0)) == 0x50bc
                        && packet->payload[2] == 0x45)
                    || (packet->payload_packet_len == 40 && ntohl(get_u_int32_t(packet->payload, 0)) == 0xcf5f3202)
                    || (packet->payload_packet_len == 38 && ntohl(get_u_int32_t(packet->payload, 0)) == 0xc1457f03)
                    || (packet->payload_packet_len == 28 && ntohl(get_u_int32_t(packet->payload, 0)) == 0x015f2c00))) {
            if (flow->l4.udp.xbox_stage == 1) {
                ndpi_int_xbox_add_connection(ndpi_struct, flow);
                NDPI_LOG_INFO(ndpi_struct, "found xbox udp connection detected\n");
                return;
            }
            NDPI_LOG_DBG(ndpi_struct, "maybe xbox\n");
            flow->l4.udp.xbox_stage++;
            return;
        }

        /* exclude here all non matched udp traffic, exclude here tcp only if http has been excluded, because xbox could use http */
        if(NDPI_COMPARE_PROTOCOL_TO_BITMASK(flow->excluded_protocol_bitmask, NDPI_PROTOCOL_HTTP) != 0) {
            NDPI_EXCLUDE_PROTO(ndpi_struct, flow);
        }
    }
    /* to not exclude tcp traffic here, done by http code... */
}


void init_xbox_dissector(struct ndpi_detection_module_struct *ndpi_struct, u_int32_t *id, NDPI_PROTOCOL_BITMASK *detection_bitmask)
{
    ndpi_set_bitmask_protocol_detection("Xbox", ndpi_struct, detection_bitmask, *id,
            NDPI_PROTOCOL_XBOX,
            ndpi_search_xbox,
            NDPI_SELECTION_BITMASK_PROTOCOL_V4_V6_TCP_WITH_PAYLOAD,
            NO_SAVE_DETECTION_BITMASK_AS_UNKNOWN,
            ADD_TO_DETECTION_BITMASK);

    *id += 1;
}

