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/*
* tplink_shp.c
*
* TP-LINK Smart Home Protocol
*
* Copyright (C) 2022-23 - ntop.org
*
* 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_TPLINK_SHP
#include "ndpi_api.h"
#include "ndpi_private.h"
#define _TPLSHP_MIN_LEN 2
#define _TPLSHP_TCP_LEN_HDR 4
static void ndpi_int_tplink_shp_add_connection(struct ndpi_detection_module_struct * const ndpi_struct,
struct ndpi_flow_struct * const flow)
{
NDPI_LOG_INFO(ndpi_struct, "found TPLINK SHP\n");
ndpi_set_detected_protocol(ndpi_struct, flow,
NDPI_PROTOCOL_TPLINK_SHP,
NDPI_PROTOCOL_UNKNOWN,
NDPI_CONFIDENCE_DPI);
}
/* ***************************************************** */
static void ndpi_search_tplink_shp(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 TPLINK SHP\n");
u_int16_t offset = 0;
/* Skip length header (TCP payloads only) */
if(packet->tcp != NULL) offset = _TPLSHP_TCP_LEN_HDR;
if (packet->payload_packet_len - offset < _TPLSHP_MIN_LEN)
{
NDPI_EXCLUDE_PROTO(ndpi_struct, flow);
return;
}
u_int16_t i;
u_int8_t k = 171, b[_TPLSHP_MIN_LEN];
for (i = 0 ; i < _TPLSHP_MIN_LEN; i++)
{
b[i] = packet->payload[i + offset] ^ k;
k = packet->payload[i + offset];
}
if (b[0] != '{' || (b[1] != '}' && b[1] != '"'))
{
NDPI_EXCLUDE_PROTO(ndpi_struct, flow);
return;
}
ndpi_int_tplink_shp_add_connection(ndpi_struct, flow);
}
/* ***************************************************** */
void init_tplink_shp_dissector(struct ndpi_detection_module_struct *ndpi_struct,
u_int32_t *id)
{
ndpi_set_bitmask_protocol_detection("TPLINK SHP", ndpi_struct, *id,
NDPI_PROTOCOL_TPLINK_SHP,
ndpi_search_tplink_shp,
NDPI_SELECTION_BITMASK_PROTOCOL_V4_V6_TCP_OR_UDP_WITH_PAYLOAD_WITHOUT_RETRANSMISSION,
SAVE_DETECTION_BITMASK_AS_UNKNOWN,
ADD_TO_DETECTION_BITMASK
);
*id += 1;
}
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