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/*
* kafka.c
*
* Copyright (C) 2023 - ntop.org
* Copyright (C) 2023 - 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_APACHE_KAFKA
#include "ndpi_api.h"
#include "ndpi_private.h"
static void ndpi_search_kafka(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 Apache Kafka\n");
/* All Kafka stuff start with 4 bytes containing the payload length
* minus 4 bytes.
* API keys: https://kafka.apache.org/protocol.html#protocol_api_keys
* API versions: https://cwiki.apache.org/confluence/display/KAFKA/Kafka+APIs
*/
if (packet->payload_packet_len > 40 &&
ntohl(get_u_int32_t(packet->payload, 0)) == (u_int32_t)(packet->payload_packet_len-4))
{
/* Request */
if (!flow->l4.tcp.kafka_stage &&
current_pkt_from_client_to_server(ndpi_struct, flow) &&
ntohs(get_u_int16_t(packet->payload, 4)) < 75 && /* API key */
ntohs(get_u_int16_t(packet->payload, 6)) < 16 /* API version */)
{
flow->l4.tcp.kafka_correlation_id = ntohl(get_u_int16_t(packet->payload, 8));
flow->l4.tcp.kafka_stage = 1;
return;
}
/* Response */
if (flow->l4.tcp.kafka_stage == 1 &&
current_pkt_from_server_to_client(ndpi_struct, flow))
{
if (ntohl(get_u_int16_t(packet->payload, 4)) == flow->l4.tcp.kafka_correlation_id)
{
NDPI_LOG_INFO(ndpi_struct, "found Apache Kafka\n");
ndpi_set_detected_protocol(ndpi_struct, flow, NDPI_PROTOCOL_APACHE_KAFKA,
NDPI_PROTOCOL_UNKNOWN, NDPI_CONFIDENCE_DPI);
return;
}
}
}
NDPI_EXCLUDE_PROTO(ndpi_struct, flow);
}
void init_kafka_dissector(struct ndpi_detection_module_struct *ndpi_struct, u_int32_t *id)
{
ndpi_set_bitmask_protocol_detection("Kafka", ndpi_struct, *id,
NDPI_PROTOCOL_APACHE_KAFKA,
ndpi_search_kafka,
NDPI_SELECTION_BITMASK_PROTOCOL_V4_V6_TCP_WITH_PAYLOAD_WITHOUT_RETRANSMISSION,
SAVE_DETECTION_BITMASK_AS_UNKNOWN,
ADD_TO_DETECTION_BITMASK);
*id += 1;
}
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