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/*
* epicgames.c
*
* Copyright (C) 2023 - ntop.org
*
* 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_EPICGAMES
#include "ndpi_api.h"
#include "ndpi_private.h"
static void ndpi_int_epicgames_add_connection(struct ndpi_detection_module_struct * const ndpi_struct,
struct ndpi_flow_struct * const flow)
{
NDPI_LOG_INFO(ndpi_struct, "found EpicGames\n");
ndpi_set_detected_protocol(ndpi_struct, flow,
NDPI_PROTOCOL_UNKNOWN,
NDPI_PROTOCOL_EPICGAMES,
NDPI_CONFIDENCE_DPI);
}
static void ndpi_search_epicgames(struct ndpi_detection_module_struct *ndpi_struct,
struct ndpi_flow_struct *flow)
{
struct ndpi_packet_struct *packet = &ndpi_struct->packet;
NDPI_LOG_DBG(ndpi_struct, "searching EpicGames (stage %d dir %d)\n",
flow->l4.udp.epicgames_stage, packet->packet_direction);
if(flow->packet_counter == 1) {
if(packet->payload_packet_len >= 34 &&
((ntohl(get_u_int32_t(packet->payload, 0)) & 0x08) == 0) &&
get_u_int64_t(packet->payload, 10) == 0 &&
get_u_int64_t(packet->payload, 18) == 0 &&
get_u_int64_t(packet->payload, 26) == 0) {
flow->l4.udp.epicgames_stage = 1 + packet->packet_direction;
flow->l4.udp.epicgames_word = ntohl(get_u_int32_t(packet->payload, 0));
return;
} else {
NDPI_EXCLUDE_PROTO(ndpi_struct, flow);
return;
}
} else if(flow->l4.udp.epicgames_stage == 2 - packet->packet_direction) {
if(packet->payload_packet_len > 4 &&
(flow->l4.udp.epicgames_word | 0x08) == ntohl(get_u_int32_t(packet->payload, 0))) {
ndpi_int_epicgames_add_connection(ndpi_struct, flow);
return;
} else {
NDPI_EXCLUDE_PROTO(ndpi_struct, flow);
return;
}
}
if(flow->packet_counter >= 4) {
NDPI_EXCLUDE_PROTO(ndpi_struct, flow);
return;
}
}
void init_epicgames_dissector(struct ndpi_detection_module_struct *ndpi_struct,
u_int32_t *id)
{
ndpi_set_bitmask_protocol_detection("EpicGames", ndpi_struct, *id,
NDPI_PROTOCOL_EPICGAMES,
ndpi_search_epicgames,
NDPI_SELECTION_BITMASK_PROTOCOL_V4_V6_UDP_WITH_PAYLOAD,
SAVE_DETECTION_BITMASK_AS_UNKNOWN,
ADD_TO_DETECTION_BITMASK);
*id += 1;
}
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