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/*
* telegram.c
*
* Copyright (C) 2014 by Gianluca Costa xplico.org
* Copyright (C) 2012-20 - 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_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");
}
void ndpi_search_telegram(struct ndpi_detection_module_struct *ndpi_struct, struct ndpi_flow_struct *flow)
{
struct ndpi_packet_struct *packet = &flow->packet;
u_int16_t dport /* , sport */;
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) {
dport = ntohs(packet->tcp->dest);
/* 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;
}
}
}
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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