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/*
* armagetron.c
*
* Copyright (C) 2009-11 - ipoque GmbH
* Copyright (C) 2011-22 - 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_ARMAGETRON
#include "ndpi_api.h"
#include "ndpi_private.h"
static void ndpi_int_armagetron_add_connection(struct ndpi_detection_module_struct *ndpi_struct,
struct ndpi_flow_struct *flow)
{
ndpi_set_detected_protocol(ndpi_struct, flow, NDPI_PROTOCOL_ARMAGETRON, NDPI_PROTOCOL_UNKNOWN, NDPI_CONFIDENCE_DPI);
}
static void ndpi_search_armagetron_udp(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, "search armagetron\n");
if (packet->payload_packet_len > 10) {
/* login request */
if (get_u_int32_t(packet->payload, 0) == htonl(0x000b0000)) {
const u_int16_t dataLength = ntohs(get_u_int16_t(packet->payload, 4));
if (dataLength == 0 || dataLength * 2 + 8 != packet->payload_packet_len)
goto exclude;
if (get_u_int16_t(packet->payload, 6) == htons(0x0008)
&& get_u_int16_t(packet->payload, packet->payload_packet_len - 2) == 0) {
NDPI_LOG_INFO(ndpi_struct, "found armagetron\n");
ndpi_int_armagetron_add_connection(ndpi_struct, flow);
return;
}
}
/* sync_msg */
if (packet->payload_packet_len == 16 && get_u_int16_t(packet->payload, 0) == htons(0x001c)
&& get_u_int16_t(packet->payload, 2) != 0) {
const u_int16_t dataLength = ntohs(get_u_int16_t(packet->payload, 4));
if (dataLength != 4)
goto exclude;
if (get_u_int32_t(packet->payload, 6) == htonl(0x00000500) && get_u_int32_t(packet->payload, 6 + 4) == htonl(0x00010000)
&& get_u_int16_t(packet->payload, packet->payload_packet_len - 2) == 0) {
NDPI_LOG_INFO(ndpi_struct, "found armagetron\n");
ndpi_int_armagetron_add_connection(ndpi_struct, flow);
return;
}
}
/* net_sync combination */
if (packet->payload_packet_len > 50 && get_u_int16_t(packet->payload, 0) == htons(0x0018)
&& get_u_int16_t(packet->payload, 2) != 0) {
u_int16_t val;
const u_int16_t dataLength = ntohs(get_u_int16_t(packet->payload, 4));
if (dataLength == 0 || dataLength * 2 + 8 > packet->payload_packet_len)
goto exclude;
val = get_u_int16_t(packet->payload, 6 + 2);
if (val == get_u_int16_t(packet->payload, 6 + 6)) {
val = ntohs(get_u_int16_t(packet->payload, 6 + 8));
if ((6 + 10 + val + 4) < packet->payload_packet_len
&& (get_u_int32_t(packet->payload, 6 + 10 + val) == htonl(0x00010000)
|| get_u_int32_t(packet->payload, 6 + 10 + val) == htonl(0x00000001))
&& get_u_int16_t(packet->payload, packet->payload_packet_len - 2) == 0) {
NDPI_LOG_INFO(ndpi_struct, "found armagetron\n");
ndpi_int_armagetron_add_connection(ndpi_struct, flow);
return;
}
}
}
}
exclude:
NDPI_EXCLUDE_PROTO(ndpi_struct, flow);
}
void init_armagetron_dissector(struct ndpi_detection_module_struct *ndpi_struct, u_int32_t *id)
{
ndpi_set_bitmask_protocol_detection("Armagetron", ndpi_struct, *id,
NDPI_PROTOCOL_ARMAGETRON,
ndpi_search_armagetron_udp,
NDPI_SELECTION_BITMASK_PROTOCOL_V4_V6_UDP_WITH_PAYLOAD,
SAVE_DETECTION_BITMASK_AS_UNKNOWN,
ADD_TO_DETECTION_BITMASK);
*id += 1;
}
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