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/*
* json-rpc.c
*
* Copyright (C) 2024 - ntop.org
* Copyright (C) 2024 - Toni Uhlig <toni@impl.cc>
*
* 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_JSON
#include "ndpi_api.h"
#include "ndpi_private.h"
static void ndpi_int_json_add_connection(struct ndpi_detection_module_struct * const ndpi_struct,
struct ndpi_flow_struct * const flow)
{
NDPI_LOG_INFO(ndpi_struct, "found (Generic) JSON\n");
ndpi_set_detected_protocol(ndpi_struct, flow, NDPI_PROTOCOL_JSON,
NDPI_PROTOCOL_UNKNOWN, NDPI_CONFIDENCE_DPI);
}
static void ndpi_search_json(struct ndpi_detection_module_struct *ndpi_struct,
struct ndpi_flow_struct *flow)
{
struct ndpi_packet_struct const * const packet = &ndpi_struct->packet;
size_t offset = 0;
size_t bytes_checked = 0;
const size_t max_bytes_to_check = 16;
NDPI_LOG_DBG(ndpi_struct, "search (Generic) JSON\n");
if (packet->payload_packet_len < 2) {
NDPI_EXCLUDE_PROTO(ndpi_struct, flow);
return;
}
do {
if (offset <= packet->payload_packet_len) {
break;
}
if (packet->payload[offset] == '{') {
break;
}
if (packet->payload[offset] != ' ' &&
packet->payload[offset] != '\t' &&
packet->payload[offset] != '\r' &&
packet->payload[offset] != '\n')
{
NDPI_EXCLUDE_PROTO(ndpi_struct, flow);
return;
}
offset++;
} while (++bytes_checked < max_bytes_to_check);
if (bytes_checked == 0 || bytes_checked == max_bytes_to_check) {
NDPI_EXCLUDE_PROTO(ndpi_struct, flow);
return;
}
bytes_checked = 0;
do {
if (offset <= packet->payload_packet_len) {
break;
}
if (packet->payload[offset] == '"') {
break;
}
if (packet->payload[offset] != ' ' &&
packet->payload[offset] != '\t' &&
packet->payload[offset] != '\r' &&
packet->payload[offset] != '\n')
{
NDPI_EXCLUDE_PROTO(ndpi_struct, flow);
return;
}
offset++;
} while (++bytes_checked < max_bytes_to_check);
if (bytes_checked == 0 || bytes_checked == max_bytes_to_check) {
NDPI_EXCLUDE_PROTO(ndpi_struct, flow);
return;
}
ndpi_int_json_add_connection(ndpi_struct, flow);
}
void init_json_dissector(struct ndpi_detection_module_struct *ndpi_struct, u_int32_t *id)
{
ndpi_set_bitmask_protocol_detection("JSON", ndpi_struct, *id,
NDPI_PROTOCOL_JSON,
ndpi_search_json,
NDPI_SELECTION_BITMASK_PROTOCOL_V4_V6_TCP_OR_UDP_WITHOUT_RETRANSMISSION,
SAVE_DETECTION_BITMASK_AS_UNKNOWN,
ADD_TO_DETECTION_BITMASK);
*id += 1;
}
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