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/*
* mpegdash.c
*
* Copyright (C) 2022-23 - 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_MPEGDASH
#include "ndpi_api.h"
#include "ndpi_private.h"
static void ndpi_int_mpegdash_add_connection(struct ndpi_detection_module_struct *ndpi_struct,
struct ndpi_flow_struct *flow)
{
NDPI_LOG_INFO(ndpi_struct, "found MpegDash\n");
ndpi_set_detected_protocol_keeping_master(ndpi_struct, flow, NDPI_PROTOCOL_MPEGDASH,
NDPI_CONFIDENCE_DPI);
}
static void ndpi_search_mpegdash_http(struct ndpi_detection_module_struct *ndpi_struct,
struct ndpi_flow_struct *flow)
{
struct ndpi_packet_struct *packet = &ndpi_struct->packet;
NDPI_LOG_DBG(ndpi_struct, "search MpegDash\n");
if (flow->detected_protocol_stack[0] != NDPI_PROTOCOL_HTTP &&
flow->detected_protocol_stack[1] != NDPI_PROTOCOL_HTTP)
{
if (flow->packet_counter > 2)
{
NDPI_EXCLUDE_PROTO(ndpi_struct, flow);
}
return;
}
if (packet->parsed_lines == 0)
{
ndpi_parse_packet_line_info(ndpi_struct, flow);
}
if (packet->parsed_lines > 0)
{
size_t i;
if (LINE_ENDS(packet->line[0], "RTSP/1.0") != 0 ||
LINE_ENDS(packet->line[0], ".mp4 HTTP/1.1") != 0 ||
LINE_ENDS(packet->line[0], ".m4s HTTP/1.1") != 0)
{
ndpi_int_mpegdash_add_connection(ndpi_struct, flow);
return;
}
for (i = 0; i < packet->parsed_lines && packet->line[i].len > 0; ++i)
{
if ((LINE_STARTS(packet->line[i], "Content-Type:") != 0 &&
LINE_ENDS(packet->line[i], "video/mp4") != 0) ||
LINE_STARTS(packet->line[i], "DASH") != 0)
{
ndpi_int_mpegdash_add_connection(ndpi_struct, flow);
return;
}
}
}
NDPI_EXCLUDE_PROTO(ndpi_struct, flow);
return;
}
void init_mpegdash_dissector(struct ndpi_detection_module_struct *ndpi_struct,
u_int32_t *id)
{
ndpi_set_bitmask_protocol_detection("MpegDash", ndpi_struct, *id,
NDPI_PROTOCOL_MPEGDASH,
ndpi_search_mpegdash_http,
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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