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/*
* mpegts.c (MPEG Transport Stream)
* https://en.wikipedia.org/wiki/MPEG_transport_stream
*
* Copyright (C) 2015-22 - 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_MPEGTS
#include "ndpi_api.h"
#include "ndpi_private.h"
static void ndpi_search_mpegts(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 MPEGTS\n");
if((packet->udp != NULL) && ((packet->payload_packet_len % 188) == 0)) {
u_int i, num_chunks = packet->payload_packet_len / 188;
for(i=0; i<num_chunks; i++) {
u_int offset = 188 * i;
if(packet->payload[offset] != 0x47) goto no_mpegts;
}
/* This looks MPEG TS */
NDPI_LOG_INFO(ndpi_struct, "found MPEGTS\n");
ndpi_set_detected_protocol(ndpi_struct, flow, NDPI_PROTOCOL_MPEGTS, NDPI_PROTOCOL_UNKNOWN, NDPI_CONFIDENCE_DPI);
return;
}
no_mpegts:
NDPI_EXCLUDE_PROTO(ndpi_struct, flow);
}
void init_mpegts_dissector(struct ndpi_detection_module_struct *ndpi_struct, u_int32_t *id)
{
ndpi_set_bitmask_protocol_detection("MPEG_TS", ndpi_struct, *id,
NDPI_PROTOCOL_MPEGTS,
ndpi_search_mpegts,
NDPI_SELECTION_BITMASK_PROTOCOL_V4_V6_UDP_WITH_PAYLOAD,
SAVE_DETECTION_BITMASK_AS_UNKNOWN,
ADD_TO_DETECTION_BITMASK);
*id += 1;
}
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