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/*
* telegram.c
*
* Copyright (C) 2012-22 - ntop.org
* Copyright (C) 2014 by Gianluca Costa xplico.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_TELEGRAM
#include "ndpi_api.h"
static void ndpi_int_telegram_add_connection(struct ndpi_detection_module_struct
*ndpi_struct, struct ndpi_flow_struct *flow) {
ndpi_set_detected_protocol(ndpi_struct, flow, NDPI_PROTOCOL_TELEGRAM, NDPI_PROTOCOL_UNKNOWN);
NDPI_LOG_INFO(ndpi_struct, "found telegram\n");
}
static u_int8_t is_telegram_port_range(u_int16_t port) {
if((port >= 500) && (port <= 600))
return(1);
return(0);
}
void ndpi_search_telegram(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 telegram\n");
if(packet->payload_packet_len == 0)
return;
if(packet->tcp != NULL) {
if(packet->payload_packet_len > 56) {
u_int16_t dport = ntohs(packet->tcp->dest);
/* u_int16_t sport = ntohs(packet->tcp->source); */
if(packet->payload[0] == 0xef && (dport == 443 || dport == 80 || dport == 25)) {
if(packet->payload[1] == 0x7f) {
ndpi_int_telegram_add_connection(ndpi_struct, flow);
} else if(packet->payload[1]*4 <= packet->payload_packet_len - 1) {
ndpi_int_telegram_add_connection(ndpi_struct, flow);
}
return;
}
}
} else if(packet->udp != NULL) {
/*
The latest telegram protocol
- contains a sequence of 12 consecutive 0xFF packets
- it uses low UDP ports in the 500 ramge
*/
if(packet->payload_packet_len >= 40) {
u_int16_t sport = ntohs(packet->udp->source), dport = ntohs(packet->udp->dest);
if(is_telegram_port_range(sport) || is_telegram_port_range(dport)) {
u_int i=0, found = 0;
for(i=0; i<packet->payload_packet_len; i++) {
if(packet->payload[i] == 0xFF) {
found = 1;
break;
}
}
if(!found) return;
for(i += 1; i<packet->payload_packet_len; i++) {
if(packet->payload[i] == 0xFF)
found++;
else
break;
}
if(found == 12) {
ndpi_int_telegram_add_connection(ndpi_struct, flow);
return;
}
}
}
}
NDPI_EXCLUDE_PROTO(ndpi_struct, flow);
}
void init_telegram_dissector(struct ndpi_detection_module_struct *ndpi_struct, u_int32_t *id, NDPI_PROTOCOL_BITMASK *detection_bitmask)
{
ndpi_set_bitmask_protocol_detection("Telegram", ndpi_struct, detection_bitmask, *id,
NDPI_PROTOCOL_TELEGRAM,
ndpi_search_telegram,
NDPI_SELECTION_BITMASK_PROTOCOL_V4_V6_TCP_OR_UDP,
SAVE_DETECTION_BITMASK_AS_UNKNOWN,
ADD_TO_DETECTION_BITMASK);
*id += 1;
}
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