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/*
* ayiya.c
*
* 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/>.
*
*/
/*
http://en.wikipedia.org/wiki/Anything_In_Anything
http://tools.ietf.org/html/rfc4891
*/
#include "ndpi_protocols.h"
#ifdef NDPI_PROTOCOL_AYIYA
struct ayiya {
u_int8_t flags[3];
u_int8_t next_header;
u_int32_t epoch;
u_int8_t identity[16];
u_int8_t signature[20];
};
void ndpi_search_ayiya(struct ndpi_detection_module_struct *ndpi_struct, struct ndpi_flow_struct *flow)
{
struct ndpi_packet_struct *packet = &flow->packet;
if(packet->udp && (packet->detected_protocol_stack[0] == NDPI_PROTOCOL_UNKNOWN)) {
/* Ayiya is udp based, port 5072 */
if ((packet->udp->source == htons(5072) || packet->udp->dest == htons(5072))
/* check for ayiya new packet */
&& (packet->payload_packet_len > 44)
) {
/* FINISH */
struct ayiya *a = (struct ayiya*)packet->payload;
u_int32_t epoch = ntohl(a->epoch), now;
u_int32_t fireyears = 86400 * 365 * 5;
now = flow->packet.tick_timestamp;
if((epoch >= (now - fireyears)) && (epoch <= (now+86400 /* 1 day */)))
ndpi_int_add_connection(ndpi_struct, flow, NDPI_PROTOCOL_AYIYA/* , NDPI_REAL_PROTOCOL */);
return;
}
NDPI_ADD_PROTOCOL_TO_BITMASK(flow->excluded_protocol_bitmask, NDPI_PROTOCOL_AYIYA);
}
}
#endif
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