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/*
* tinc.c
*
* Copyright (C) 2017 - William Guglielmo <william@deselmo.com>
* Copyright (C) 2017-22 - 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_TINC
#include "ndpi_api.h"
#include "ndpi_private.h"
#include "libcache.h"
PACK_ON struct tinc_cache_entry {
u_int32_t src_address;
u_int32_t dst_address;
u_int16_t dst_port;
} PACK_OFF;
static void ndpi_check_tinc(struct ndpi_detection_module_struct *ndpi_struct, struct ndpi_flow_struct *flow)
{
struct ndpi_packet_struct *packet = &ndpi_struct->packet;
const u_int8_t *packet_payload = packet->payload;
u_int32_t payload_len = packet->payload_packet_len;
if(packet->udp != NULL) {
if(ndpi_struct->tinc_cache != NULL) {
struct tinc_cache_entry tinc_cache_entry1 = {
.src_address = packet->iph->saddr,
.dst_address = packet->iph->daddr,
.dst_port = packet->udp->dest
};
struct tinc_cache_entry tinc_cache_entry2 = {
.src_address = packet->iph->daddr,
.dst_address = packet->iph->saddr,
.dst_port = packet->udp->source
};
if(cache_remove(ndpi_struct->tinc_cache, &tinc_cache_entry1, sizeof(tinc_cache_entry1)) == CACHE_NO_ERROR ||
cache_remove(ndpi_struct->tinc_cache, &tinc_cache_entry2, sizeof(tinc_cache_entry2)) == CACHE_NO_ERROR) {
cache_remove(ndpi_struct->tinc_cache, &tinc_cache_entry1, sizeof(tinc_cache_entry1));
cache_remove(ndpi_struct->tinc_cache, &tinc_cache_entry2, sizeof(tinc_cache_entry2));
/* cache_free(ndpi_struct->tinc_cache); */
NDPI_LOG_INFO(ndpi_struct, "found tinc udp connection\n");
ndpi_set_detected_protocol(ndpi_struct, flow, NDPI_PROTOCOL_TINC, NDPI_PROTOCOL_UNKNOWN, NDPI_CONFIDENCE_DPI_CACHE);
}
}
NDPI_EXCLUDE_PROTO(ndpi_struct, flow);
return;
} else if(packet->tcp != NULL) {
switch(flow->tinc_state) {
case 0:
case 1:
if(payload_len > 6 && memcmp(packet_payload, "0 ", 2) == 0 && packet_payload[2] != ' ') {
u_int32_t i = 3;
while(i < payload_len && packet_payload[i++] != ' ');
if(i+3 == payload_len && memcmp((packet_payload+i), "17\n", 3) == 0) {
flow->tinc_state++;
return;
}
}
break;
case 2:
case 3:
if(payload_len > 11 && memcmp(packet_payload, "1 ", 2) == 0 && packet_payload[2] != ' ') {
u_int16_t i = 3;
u_int8_t numbers_left = 4;
while(numbers_left) {
while(i < payload_len && packet_payload[i] >= '0' && packet_payload[i] <= '9') {
i++;
}
if(i < payload_len && packet_payload[i++] == ' ') {
numbers_left--;
}
else break;
}
if(numbers_left) break;
while(i < payload_len &&
((packet_payload[i] >= '0' && packet_payload[i] <= '9') ||
(packet_payload[i] >= 'A' && packet_payload[i] <= 'Z'))) {
i++;
}
if(i < payload_len && packet_payload[i] == '\n') {
if(++flow->tinc_state > 3) {
struct tinc_cache_entry tinc_cache_entry = {
.src_address = flow->c_address.v4,
.dst_address = flow->s_address.v4,
.dst_port = flow->s_port,
};
if(ndpi_struct->tinc_cache == NULL)
ndpi_struct->tinc_cache = cache_new(TINC_CACHE_MAX_SIZE);
cache_add(ndpi_struct->tinc_cache, &tinc_cache_entry, sizeof(tinc_cache_entry));
NDPI_LOG_INFO(ndpi_struct, "found tinc tcp connection\n");
ndpi_set_detected_protocol(ndpi_struct, flow, NDPI_PROTOCOL_TINC, NDPI_PROTOCOL_UNKNOWN, NDPI_CONFIDENCE_DPI);
}
return;
}
}
break;
default: break;
}
}
NDPI_EXCLUDE_PROTO(ndpi_struct, flow);
}
static void ndpi_search_tinc(struct ndpi_detection_module_struct* ndpi_struct, struct ndpi_flow_struct* flow) {
NDPI_LOG_DBG(ndpi_struct, "tinc detection\n");
if(flow->detected_protocol_stack[0] != NDPI_PROTOCOL_TINC) {
ndpi_check_tinc(ndpi_struct, flow);
}
}
void init_tinc_dissector(struct ndpi_detection_module_struct *ndpi_struct, u_int32_t *id)
{
ndpi_set_bitmask_protocol_detection("TINC", ndpi_struct, *id,
NDPI_PROTOCOL_TINC,
ndpi_search_tinc,
NDPI_SELECTION_BITMASK_PROTOCOL_TCP_OR_UDP_WITH_PAYLOAD_WITHOUT_RETRANSMISSION, /* TODO: IPv6? */
SAVE_DETECTION_BITMASK_AS_UNKNOWN,
ADD_TO_DETECTION_BITMASK);
*id += 1;
}
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