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/*
* mongodb.c
*
* Copyright (C) 2018 by Leonn Paiva <leonn.paiva@gmail.com>
*
* 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_MONGODB
#include "ndpi_api.h"
enum mongo_opcodes
{
OP_REPLY = 1,
OP_UPDATE = 2001,
OP_INSERT = 2002,
RESERVED = 2003,
OP_QUERY = 2004,
OP_GET_MORE = 2005,
OP_DELETE = 2006,
OP_KILL_CURSORS = 2007,
OP_MSG = 2013
};
struct mongo_message_header
{
uint32_t message_length;
uint32_t request_id;
uint32_t response_to;
enum mongo_opcodes op_code;
};
static void set_mongodb_detected(struct ndpi_detection_module_struct *ndpi_struct,
struct ndpi_flow_struct *flow) {
if(flow->detected_protocol_stack[0] == NDPI_PROTOCOL_UNKNOWN) {
ndpi_search_tcp_or_udp(ndpi_struct, flow);
/* If no custom protocol has been detected */
/* if(flow->detected_protocol_stack[0] == NDPI_PROTOCOL_UNKNOWN) */
ndpi_int_reset_protocol(flow);
ndpi_set_detected_protocol(ndpi_struct, flow, NDPI_PROTOCOL_MONGODB, flow->guessed_host_protocol_id);
}
}
/*************************************************************************************************/
static void ndpi_check_mongodb(struct ndpi_detection_module_struct *ndpi_struct,
struct ndpi_flow_struct *flow) {
struct mongo_message_header mongodb_hdr;
struct ndpi_packet_struct *packet = &flow->packet;
if (packet->payload_packet_len <= sizeof(mongodb_hdr)) {
NDPI_EXCLUDE_PROTO(ndpi_struct, flow);
return;
}
memcpy(&mongodb_hdr, packet->payload, sizeof(struct mongo_message_header));
mongodb_hdr.message_length = ntohs(mongodb_hdr.message_length);
if (mongodb_hdr.message_length < 4) {
NDPI_LOG_DBG(ndpi_struct, "Invalid MONGODB length");
NDPI_EXCLUDE_PROTO(ndpi_struct, flow);
return;
}
switch(mongodb_hdr.op_code) {
case OP_REPLY:
case OP_UPDATE:
case OP_INSERT:
case RESERVED:
case OP_QUERY:
case OP_GET_MORE:
case OP_DELETE:
case OP_KILL_CURSORS:
case OP_MSG:
set_mongodb_detected(ndpi_struct, flow);
break;
default:
NDPI_LOG_DBG(ndpi_struct, "Invalid MONGODB length");
NDPI_EXCLUDE_PROTO(ndpi_struct, flow);
break;
}
}
void ndpi_search_mongodb(struct ndpi_detection_module_struct *ndpi_struct,
struct ndpi_flow_struct *flow)
{
struct ndpi_packet_struct *packet = &flow->packet;
// Break after 6 packets.
if(flow->packet_counter > 6) {
NDPI_EXCLUDE_PROTO(ndpi_struct, flow);
return;
}
if(packet->detected_protocol_stack[0] != NDPI_PROTOCOL_UNKNOWN) {
return;
}
NDPI_LOG_DBG(ndpi_struct, "search MongoDB\n");
ndpi_check_mongodb(ndpi_struct, flow);
return;
}
/* ********************************* */
void init_mongodb_dissector(struct ndpi_detection_module_struct *ndpi_struct,
u_int32_t *id, NDPI_PROTOCOL_BITMASK *detection_bitmask)
{
ndpi_set_bitmask_protocol_detection("MongoDB", ndpi_struct, detection_bitmask,
*id, NDPI_PROTOCOL_MONGODB, ndpi_search_mongodb,
NDPI_SELECTION_BITMASK_PROTOCOL_V4_V6_TCP_WITH_PAYLOAD,
SAVE_DETECTION_BITMASK_AS_UNKNOWN,
ADD_TO_DETECTION_BITMASK);
*id += 1;
}
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