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/*
* eaq.c
*
* Copyright (C) 2015 - 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_api.h"
#define EAQ_DEFAULT_PORT 6000
#define EAQ_DEFAULT_SIZE 16
#ifdef NDPI_PROTOCOL_EAQ
static void ndpi_int_eaq_add_connection(struct ndpi_detection_module_struct *ndpi_struct,
struct ndpi_flow_struct *flow) {
ndpi_int_add_connection(ndpi_struct, flow, NDPI_PROTOCOL_EAQ, NDPI_REAL_PROTOCOL);
}
void ndpi_search_eaq(struct ndpi_detection_module_struct *ndpi_struct, struct ndpi_flow_struct *flow) {
struct ndpi_packet_struct *packet = &flow->packet;
u_int16_t sport = ntohs(packet->udp->source), dport = ntohs(packet->udp->dest);
unsigned char *vers;
int ver_offs;
if((packet->payload_packet_len != EAQ_DEFAULT_SIZE)
|| ((sport != EAQ_DEFAULT_PORT) && (dport != EAQ_DEFAULT_PORT))) {
exclude_eaq:
NDPI_LOG(NDPI_PROTOCOL_EAQ, ndpi_struct, NDPI_LOG_DEBUG, "Exclude eaq.\n");
NDPI_ADD_PROTOCOL_TO_BITMASK(flow->excluded_protocol_bitmask, NDPI_PROTOCOL_EAQ);
return;
}
if(packet->udp != NULL) {
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)) {
; /* Looks good */
} else
goto exclude_eaq;
}
if(++flow->l4.udp.eaq_pkt_id == 4) {
/* We have collected enough packets so we assume it's EAQ */
NDPI_LOG(NDPI_PROTOCOL_EAQ, ndpi_struct, NDPI_LOG_DEBUG, "found eaq.\n");
ndpi_int_eaq_add_connection(ndpi_struct, flow);
}
} else
goto exclude_eaq;
}
#endif
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