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/*
* eaq.c
*
* Copyright (C) 2015-22 - ntop.org
*
* This module 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.
*
* This module 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.
* If not, see <http://www.gnu.org/licenses/>.
*
*/
/*
EAQ: Entitade Aferidora da Qualidade de Banda Larga
http://www.brasilbandalarga.com.br
*/
#include "ndpi_protocol_ids.h"
#define NDPI_CURRENT_PROTO NDPI_PROTOCOL_EAQ
#include "ndpi_api.h"
#include "ndpi_private.h"
#define EAQ_DEFAULT_PORT 6000
#define EAQ_DEFAULT_SIZE 16
static void ndpi_int_eaq_add_connection(struct ndpi_detection_module_struct *ndpi_struct,
struct ndpi_flow_struct *flow) {
ndpi_set_detected_protocol(ndpi_struct, flow, NDPI_PROTOCOL_EAQ, NDPI_PROTOCOL_UNKNOWN, NDPI_CONFIDENCE_DPI);
}
static void ndpi_search_eaq(struct ndpi_detection_module_struct *ndpi_struct, struct ndpi_flow_struct *flow) {
struct ndpi_packet_struct *packet = &ndpi_struct->packet;
u_int16_t sport = ntohs(packet->udp->source), dport = ntohs(packet->udp->dest);
NDPI_LOG_DBG(ndpi_struct, "search eaq\n");
do {
if( (packet->payload_packet_len != EAQ_DEFAULT_SIZE) ||
((sport != EAQ_DEFAULT_PORT) && (dport != EAQ_DEFAULT_PORT)) )
break;
u_int32_t seq = (packet->payload[0] * 1000) + (packet->payload[1] * 100) + (packet->payload[2] * 10) + packet->payload[3];
if(flow->l4.udp.eaq_pkt_id == 0)
flow->l4.udp.eaq_sequence = seq;
else {
if( (flow->l4.udp.eaq_sequence != seq) &&
((flow->l4.udp.eaq_sequence+1) != seq))
break;
else
flow->l4.udp.eaq_sequence = seq;
}
if(++flow->l4.udp.eaq_pkt_id == 4) {
/* We have collected enough packets so we assume it's EAQ */
NDPI_LOG_INFO(ndpi_struct, "found eaq\n");
ndpi_int_eaq_add_connection(ndpi_struct, flow);
return;
} else
return;
} while(0);
NDPI_EXCLUDE_PROTO(ndpi_struct, flow);
}
void init_eaq_dissector(struct ndpi_detection_module_struct *ndpi_struct, u_int32_t *id)
{
ndpi_set_bitmask_protocol_detection("EAQ", ndpi_struct, *id,
NDPI_PROTOCOL_EAQ,
ndpi_search_eaq,
NDPI_SELECTION_BITMASK_PROTOCOL_V4_V6_UDP_WITH_PAYLOAD,
SAVE_DETECTION_BITMASK_AS_UNKNOWN,
ADD_TO_DETECTION_BITMASK);
*id += 1;
}
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