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/*
* source_engine.c
*
* Source Engine Protocol
*
* Copyright (C) 2023 - 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_SOURCE_ENGINE
#include "ndpi_api.h"
#include "ndpi_private.h"
static void ndpi_int_source_engine_add_connection(struct ndpi_detection_module_struct * const ndpi_struct,
struct ndpi_flow_struct * const flow)
{
NDPI_LOG_INFO(ndpi_struct, "found Source Engine\n");
ndpi_set_detected_protocol(ndpi_struct, flow,
NDPI_PROTOCOL_SOURCE_ENGINE,
NDPI_PROTOCOL_UNKNOWN,
NDPI_CONFIDENCE_DPI);
}
/* ***************************************************** */
static void ndpi_search_source_engine(struct ndpi_detection_module_struct *ndpi_struct,
struct ndpi_flow_struct *flow)
{
struct ndpi_packet_struct const * const packet = &ndpi_struct->packet;
char const source_engine_query[] = "Source Engine Query";
size_t const source_engine_query_len = strlen(source_engine_query);
NDPI_LOG_DBG(ndpi_struct, "search Source Engine\n");
if (packet->payload_packet_len < source_engine_query_len + 1 /* '\0' */)
{
NDPI_EXCLUDE_PROTO(ndpi_struct, flow);
return;
}
if (packet->payload[packet->payload_packet_len - 1] != '\0')
{
NDPI_EXCLUDE_PROTO(ndpi_struct, flow);
return;
}
if (strncmp((char const *)&packet->payload[packet->payload_packet_len - source_engine_query_len - 1],
source_engine_query, source_engine_query_len) != 0)
{
NDPI_EXCLUDE_PROTO(ndpi_struct, flow);
return;
}
ndpi_int_source_engine_add_connection(ndpi_struct, flow);
}
/* ***************************************************** */
void init_source_engine_dissector(struct ndpi_detection_module_struct *ndpi_struct,
u_int32_t *id)
{
ndpi_set_bitmask_protocol_detection("Source_Engine", ndpi_struct, *id,
NDPI_PROTOCOL_SOURCE_ENGINE,
ndpi_search_source_engine,
NDPI_SELECTION_BITMASK_PROTOCOL_V4_V6_UDP_WITH_PAYLOAD,
SAVE_DETECTION_BITMASK_AS_UNKNOWN,
ADD_TO_DETECTION_BITMASK
);
*id += 1;
}
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