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/*
* ppstream.c
*
* Copyright (C) 2009-2011 by ipoque GmbH
* Copyright (C) 2011-15 - 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_protocols.h"
#ifdef NDPI_PROTOCOL_PPSTREAM
static void ndpi_int_ppstream_add_connection(struct ndpi_detection_module_struct
*ndpi_struct, struct ndpi_flow_struct *flow)
{
ndpi_set_detected_protocol(ndpi_struct, flow, NDPI_PROTOCOL_PPSTREAM, NDPI_PROTOCOL_UNKNOWN);
}
void ndpi_search_ppstream(struct ndpi_detection_module_struct
*ndpi_struct, struct ndpi_flow_struct *flow)
{
struct ndpi_packet_struct *packet = &flow->packet;
// struct ndpi_id_struct *src=ndpi_struct->src;
// struct ndpi_id_struct *dst=ndpi_struct->dst;
/* check TCP Connections -> Videodata */
if (packet->tcp != NULL) {
if (packet->payload_packet_len >= 60 && get_u_int32_t(packet->payload, 52) == 0
&& memcmp(packet->payload, "PSProtocol\x0", 11) == 0) {
NDPI_LOG(NDPI_PROTOCOL_PPSTREAM, ndpi_struct, NDPI_LOG_DEBUG, "found ppstream over tcp.\n");
ndpi_int_ppstream_add_connection(ndpi_struct, flow);
return;
}
}
if (packet->udp != NULL) {
if (packet->payload_packet_len > 2 && packet->payload[2] == 0x43
&& ((packet->payload_packet_len - 4 == get_l16(packet->payload, 0))
|| (packet->payload_packet_len == get_l16(packet->payload, 0))
|| (packet->payload_packet_len >= 6 && packet->payload_packet_len - 6 == get_l16(packet->payload, 0)))) {
flow->l4.udp.ppstream_stage++;
if (flow->l4.udp.ppstream_stage == 5) {
NDPI_LOG(NDPI_PROTOCOL_PPSTREAM, ndpi_struct, NDPI_LOG_DEBUG,
"found ppstream over udp pattern len, 43.\n");
ndpi_int_ppstream_add_connection(ndpi_struct, flow);
return;
}
return;
}
if (flow->l4.udp.ppstream_stage == 0
&& packet->payload_packet_len > 4 && ((packet->payload_packet_len - 4 == get_l16(packet->payload, 0))
|| (packet->payload_packet_len == get_l16(packet->payload, 0))
|| (packet->payload_packet_len >= 6
&& packet->payload_packet_len - 6 == get_l16(packet->payload,
0)))) {
if (packet->payload[2] == 0x00 && packet->payload[3] == 0x00 && packet->payload[4] == 0x03) {
flow->l4.udp.ppstream_stage = 7;
NDPI_LOG(NDPI_PROTOCOL_PPSTREAM, ndpi_struct, NDPI_LOG_DEBUG, "need next packet I.\n");
return;
}
}
if (flow->l4.udp.ppstream_stage == 7
&& packet->payload_packet_len > 4 && packet->payload[3] == 0x00
&& ((packet->payload_packet_len - 4 == get_l16(packet->payload, 0))
|| (packet->payload_packet_len == get_l16(packet->payload, 0))
|| (packet->payload_packet_len >= 6 && packet->payload_packet_len - 6 == get_l16(packet->payload, 0)))
&& (packet->payload[2] == 0x00 && packet->payload[4] == 0x03)) {
NDPI_LOG(NDPI_PROTOCOL_PPSTREAM, ndpi_struct, NDPI_LOG_DEBUG,
"found ppstream over udp with pattern Vb.\n");
ndpi_int_ppstream_add_connection(ndpi_struct, flow);
return;
}
}
NDPI_LOG(NDPI_PROTOCOL_PPSTREAM, ndpi_struct, NDPI_LOG_DEBUG, "exclude ppstream.\n");
NDPI_ADD_PROTOCOL_TO_BITMASK(flow->excluded_protocol_bitmask, NDPI_PROTOCOL_PPSTREAM);
}
void init_ppstream_dissector(struct ndpi_detection_module_struct *ndpi_struct, u_int32_t *id, NDPI_PROTOCOL_BITMASK *detection_bitmask)
{
ndpi_set_bitmask_protocol_detection("PPStream", ndpi_struct, detection_bitmask, *id,
NDPI_PROTOCOL_PPSTREAM,
ndpi_search_ppstream,
NDPI_SELECTION_BITMASK_PROTOCOL_V4_V6_TCP_OR_UDP_WITH_PAYLOAD,
SAVE_DETECTION_BITMASK_AS_UNKNOWN,
ADD_TO_DETECTION_BITMASK);
*id += 1;
}
#endif
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