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/*
* bfcp.c
*
* Binary Floor Control Protocol
*
* Copyright (C) 2024 - ntop.org
* Copyright (C) 2024 - V.G <v.gavrilov@securitycode.ru>
*
* 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_BFCP
#include "ndpi_api.h"
#include "ndpi_private.h"
static void ndpi_search_bfcp(struct ndpi_detection_module_struct *ndpi_struct,
struct ndpi_flow_struct *flow)
{
struct ndpi_packet_struct const * const packet = &ndpi_struct->packet;
NDPI_LOG_DBG(ndpi_struct, "search BFCP\n");
if (packet->payload_packet_len < 12) {
goto not_bfcp;
}
u_int8_t version = (packet->payload[0] >> 5) & 0x07;
u_int8_t reserved = (packet->payload[0] >> 3) & 0x01;
if (version != 1 || reserved != 0) {
goto not_bfcp;
}
u_int8_t primitive = packet->payload[1];
if (primitive < 1 || primitive > 17) {
goto not_bfcp;
}
u_int32_t conference_id = ntohl(get_u_int32_t(packet->payload, 4));
if (!flow->bfcp_stage) {
flow->bfcp_conference_id = conference_id;
flow->bfcp_stage = 1;
return;
}
if (flow->bfcp_stage && flow->bfcp_conference_id == conference_id) {
NDPI_LOG_INFO(ndpi_struct, "found BFCP\n");
ndpi_set_detected_protocol(ndpi_struct, flow, NDPI_PROTOCOL_BFCP,
NDPI_PROTOCOL_UNKNOWN, NDPI_CONFIDENCE_DPI);
return;
}
not_bfcp:
NDPI_EXCLUDE_PROTO(ndpi_struct, flow);
}
void init_bfcp_dissector(struct ndpi_detection_module_struct *ndpi_struct, u_int32_t *id)
{
ndpi_set_bitmask_protocol_detection("BFCP", ndpi_struct, *id,
NDPI_PROTOCOL_BFCP,
ndpi_search_bfcp,
NDPI_SELECTION_BITMASK_PROTOCOL_V4_V6_TCP_OR_UDP_WITH_PAYLOAD_WITHOUT_RETRANSMISSION,
SAVE_DETECTION_BITMASK_AS_UNKNOWN,
ADD_TO_DETECTION_BITMASK);
*id += 1;
}
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