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/*
* battlefield.c
*
* Copyright (C) 2009-2011 by ipoque GmbH
* Copyright (C) 2011-15 - 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_protocols.h"
#ifdef NDPI_PROTOCOL_BATTLEFIELD
static void ndpi_int_battlefield_add_connection(struct ndpi_detection_module_struct *ndpi_struct, struct ndpi_flow_struct *flow)
{
struct ndpi_packet_struct *packet = &flow->packet;
struct ndpi_id_struct *src = flow->src;
struct ndpi_id_struct *dst = flow->dst;
ndpi_set_detected_protocol(ndpi_struct, flow, NDPI_PROTOCOL_BATTLEFIELD);
if (src != NULL) {
src->battlefield_ts = packet->tick_timestamp;
}
if (dst != NULL) {
dst->battlefield_ts = packet->tick_timestamp;
}
}
void ndpi_search_battlefield(struct ndpi_detection_module_struct *ndpi_struct, struct ndpi_flow_struct *flow)
{
struct ndpi_packet_struct *packet = &flow->packet;
struct ndpi_id_struct *src = flow->src;
struct ndpi_id_struct *dst = flow->dst;
if (packet->detected_protocol_stack[0] == NDPI_PROTOCOL_BATTLEFIELD) {
if (src != NULL && ((u_int32_t)
(packet->tick_timestamp - src->battlefield_ts) < ndpi_struct->battlefield_timeout)) {
NDPI_LOG(NDPI_PROTOCOL_BATTLEFIELD, ndpi_struct, NDPI_LOG_DEBUG,
"battlefield : save src connection packet detected\n");
src->battlefield_ts = packet->tick_timestamp;
} else if (dst != NULL && ((u_int32_t)
(packet->tick_timestamp - dst->battlefield_ts) < ndpi_struct->battlefield_timeout)) {
NDPI_LOG(NDPI_PROTOCOL_BATTLEFIELD, ndpi_struct, NDPI_LOG_DEBUG,
"battlefield : save dst connection packet detected\n");
dst->battlefield_ts = packet->tick_timestamp;
}
return;
}
if (NDPI_SRC_OR_DST_HAS_PROTOCOL(src, dst, NDPI_PROTOCOL_BATTLEFIELD)) {
if (flow->l4.udp.battlefield_stage == 0 || flow->l4.udp.battlefield_stage == 1 + packet->packet_direction) {
if (packet->payload_packet_len > 8 && get_u_int16_t(packet->payload, 0) == htons(0xfefd)) {
flow->l4.udp.battlefield_msg_id = get_u_int32_t(packet->payload, 2);
flow->l4.udp.battlefield_stage = 1 + packet->packet_direction;
return;
}
} else if (flow->l4.udp.battlefield_stage == 2 - packet->packet_direction) {
if (packet->payload_packet_len > 8 && get_u_int32_t(packet->payload, 0) == flow->l4.udp.battlefield_msg_id) {
NDPI_LOG(NDPI_PROTOCOL_BATTLEFIELD, ndpi_struct,
NDPI_LOG_DEBUG, "Battlefield message and reply detected.\n");
ndpi_int_battlefield_add_connection(ndpi_struct, flow);
return;
}
}
}
if (flow->l4.udp.battlefield_stage == 0) {
if (packet->payload_packet_len == 46 && packet->payload[2] == 0 && packet->payload[4] == 0
&& get_u_int32_t(packet->payload, 7) == htonl(0x98001100)) {
flow->l4.udp.battlefield_stage = 3 + packet->packet_direction;
return;
}
} else if (flow->l4.udp.battlefield_stage == 4 - packet->packet_direction) {
if (packet->payload_packet_len == 7
&& (packet->payload[0] == 0x02 || packet->payload[packet->payload_packet_len - 1] == 0xe0)) {
NDPI_LOG(NDPI_PROTOCOL_BATTLEFIELD, ndpi_struct, NDPI_LOG_DEBUG,
"Battlefield message and reply detected.\n");
ndpi_int_battlefield_add_connection(ndpi_struct, flow);
return;
}
}
if (packet->payload_packet_len == 18 && memcmp(&packet->payload[5], "battlefield2\x00", 13) == 0) {
NDPI_LOG(NDPI_PROTOCOL_BATTLEFIELD, ndpi_struct, NDPI_LOG_DEBUG, "Battlefield 2 hello packet detected.\n");
ndpi_int_battlefield_add_connection(ndpi_struct, flow);
return;
} else if (packet->payload_packet_len > 10 &&
(memcmp(packet->payload, "\x11\x20\x00\x01\x00\x00\x50\xb9\x10\x11", 10) == 0
|| memcmp(packet->payload, "\x11\x20\x00\x01\x00\x00\x30\xb9\x10\x11", 10) == 0
|| memcmp(packet->payload, "\x11\x20\x00\x01\x00\x00\xa0\x98\x00\x11", 10) == 0)) {
NDPI_LOG(NDPI_PROTOCOL_BATTLEFIELD, ndpi_struct, NDPI_LOG_DEBUG, "Battlefield safe pattern detected.\n");
ndpi_int_battlefield_add_connection(ndpi_struct, flow);
return;
}
NDPI_ADD_PROTOCOL_TO_BITMASK(flow->excluded_protocol_bitmask, NDPI_PROTOCOL_BATTLEFIELD);
return;
}
#endif
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