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/*
* raft.c
*
* Copyright (C) 2024 - ntop.org
*
* 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_RAFT
#include "ndpi_api.h"
#include "ndpi_private.h"
PACK_ON
struct raft_header {
uint64_t msg_type;
uint64_t msg_length;
} PACK_OFF;
enum raft_header_type {
RAFT_IO_APPEND_ENTRIES = 1,
RAFT_IO_APPEND_ENTRIES_RESULT,
RAFT_IO_REQUEST_VOTE,
RAFT_IO_REQUEST_VOTE_RESULT,
RAFT_IO_INSTALL_SNAPSHOT,
RAFT_IO_TIMEOUT_NOW
};
static void ndpi_int_raft_add_connection(struct ndpi_detection_module_struct *ndpi_struct,
struct ndpi_flow_struct *flow)
{
NDPI_LOG_INFO(ndpi_struct, "found raft\n");
ndpi_set_detected_protocol(ndpi_struct, flow,
NDPI_PROTOCOL_RAFT,
NDPI_PROTOCOL_UNKNOWN,
NDPI_CONFIDENCE_DPI);
}
static void ndpi_search_raft(struct ndpi_detection_module_struct *ndpi_struct,
struct ndpi_flow_struct *flow)
{
struct ndpi_packet_struct const * const packet = &ndpi_struct->packet;
struct raft_header const * const raft_header = (struct raft_header *)packet->payload;
NDPI_LOG_DBG(ndpi_struct, "search raft\n");
if (packet->payload_packet_len < sizeof(*raft_header))
{
NDPI_EXCLUDE_PROTO(ndpi_struct, flow);
return;
}
uint64_t msg_type = le64toh(raft_header->msg_type);
switch (msg_type)
{
case RAFT_IO_APPEND_ENTRIES:
case RAFT_IO_APPEND_ENTRIES_RESULT:
case RAFT_IO_REQUEST_VOTE:
case RAFT_IO_REQUEST_VOTE_RESULT:
case RAFT_IO_INSTALL_SNAPSHOT:
case RAFT_IO_TIMEOUT_NOW:
break;
default:
NDPI_EXCLUDE_PROTO(ndpi_struct, flow);
return;
}
uint64_t msg_length = le64toh(raft_header->msg_length);
if (msg_length == packet->payload_packet_len - sizeof(*raft_header))
{
ndpi_int_raft_add_connection(ndpi_struct, flow);
return;
}
if (flow->packet_counter < 3)
{
return;
}
ndpi_int_raft_add_connection(ndpi_struct, flow);
}
void init_raft_dissector(struct ndpi_detection_module_struct *ndpi_struct,
u_int32_t *id)
{
ndpi_set_bitmask_protocol_detection("Raft", ndpi_struct, *id,
NDPI_PROTOCOL_RAFT,
ndpi_search_raft,
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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