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/*
* h323.c
*
* Copyright (C) 2015-20 ntop.org
* Copyright (C) 2013 Remy Mudingay <mudingay@ill.fr>
*
* 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_H323
#include "ndpi_api.h"
#include "ndpi_private.h"
static void ndpi_int_h323_add_connection(struct ndpi_detection_module_struct *ndpi_struct,
struct ndpi_flow_struct *flow)
{
NDPI_LOG_INFO(ndpi_struct, "found H323\n");
ndpi_set_detected_protocol(ndpi_struct, flow, NDPI_PROTOCOL_H323,
NDPI_PROTOCOL_UNKNOWN, NDPI_CONFIDENCE_DPI);
}
static void ndpi_search_h323(struct ndpi_detection_module_struct *ndpi_struct,
struct ndpi_flow_struct *flow)
{
const struct ndpi_packet_struct * const packet = &ndpi_struct->packet;
u_int16_t dport = 0, sport = 0;
NDPI_LOG_DBG(ndpi_struct, "search H323\n");
/* TPKT header length + Q.931 header length without IE */
if(tpkt_verify_hdr(packet) && (packet->payload_packet_len > 20)) {
/* Check H.245 */
if(packet->payload[7] == 0x06 &&
ntohl(get_u_int32_t(packet->payload, 8)) == 0x0088175) /* protocolIdentifier OID */ {
ndpi_int_h323_add_connection(ndpi_struct, flow);
return;
}
/* Check H.225.0 : check Q.931 Protocol Discriminator and call reference value length */
if((packet->payload[4] == 0x08) && ((packet->payload[5] & 0xF) <= 3)) {
ndpi_int_h323_add_connection(ndpi_struct, flow);
return;
}
} else if (packet->udp != NULL) {
sport = ntohs(packet->udp->source), dport = ntohs(packet->udp->dest);
if(sport == 1719 || dport == 1719) {
/* Check H.225.0 RAS */
if(packet->payload_packet_len > 20 &&
packet->payload[4] == 0x06 &&
ntohl(get_u_int32_t(packet->payload, 5)) == 0x0008914A /* protocolIdentifier OID */ ) {
ndpi_int_h323_add_connection(ndpi_struct, flow);
return;
}
}
}
NDPI_EXCLUDE_PROTO(ndpi_struct, flow);
}
void init_h323_dissector(struct ndpi_detection_module_struct *ndpi_struct,
u_int32_t *id)
{
ndpi_set_bitmask_protocol_detection("H323", ndpi_struct, *id,
NDPI_PROTOCOL_H323,
ndpi_search_h323,
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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