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/*
* cassandra.c
*
* Apache Cassandra CQL Binary protocol
*
* 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_CASSANDRA
#include "ndpi_api.h"
#include "ndpi_private.h"
static inline int ndpi_validate_cassandra_response(u_int8_t response)
{
return (response >= 0x81 && response <= 0x85) ? 1 : -1;
}
static inline int ndpi_validate_cassandra_request(u_int8_t request)
{
return (request >= 0x01 && request <= 0x05) ? 1 : -1;
}
static void ndpi_int_cassandra_add_connection(struct ndpi_detection_module_struct *ndpi_struct,
struct ndpi_flow_struct *flow)
{
NDPI_LOG_INFO(ndpi_struct, "found Cassandra CQL\n");
ndpi_set_detected_protocol(ndpi_struct, flow,
NDPI_PROTOCOL_CASSANDRA, NDPI_PROTOCOL_UNKNOWN,
NDPI_CONFIDENCE_DPI);
}
static void ndpi_search_cassandra(struct ndpi_detection_module_struct *ndpi_struct,
struct ndpi_flow_struct *flow)
{
struct ndpi_packet_struct *packet = &ndpi_struct->packet;
NDPI_LOG_DBG(ndpi_struct, "search Cassandra CQL\n");
if (packet->payload_packet_len == 19 &&
ntohl(get_u_int32_t(packet->payload, 0)) == 0xCA552DFA)
{
NDPI_LOG_INFO(ndpi_struct, "found Cassandra Internode Communication\n");
ndpi_int_cassandra_add_connection(ndpi_struct, flow);
return;
}
if ((packet->payload_packet_len < 9) ||
(flow->packet_counter >= 8) ||
(!ndpi_validate_cassandra_response(packet->payload[0]) ||
!ndpi_validate_cassandra_request(packet->payload[0])))
{
NDPI_EXCLUDE_PROTO(ndpi_struct, flow);
return;
}
if (flow->packet_direction_counter[packet->packet_direction] > 2) {
NDPI_EXCLUDE_PROTO(ndpi_struct, flow);
return;
}
/* Looking for a 'STARTUP' message from the client,
* which should always contain the CQL_VERSION string
*/
if (packet->payload_packet_len > 60 &&
memcmp(&packet->payload[packet->payload_packet_len-20], "CQL_VERSION", 11) == 0)
{
NDPI_LOG_INFO(ndpi_struct, "found Cassandra CQL\n");
ndpi_int_cassandra_add_connection(ndpi_struct, flow);
return;
}
}
void init_cassandra_dissector(struct ndpi_detection_module_struct *ndpi_struct,
u_int32_t *id) {
ndpi_set_bitmask_protocol_detection("Cassandra",
ndpi_struct,
*id,
NDPI_PROTOCOL_CASSANDRA,
ndpi_search_cassandra,
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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