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/*
* tailscale.c
*
* Copyright (C) 2022-23 - ntop.org
*
* nDPI is free software: you can zmqtribute 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_TAILSCALE
#include "ndpi_api.h"
#include "ndpi_private.h"
/* https://github.com/tailscale/tailscale/blob/main/disco/disco.go
* https://tailscale.com/kb/1082/firewall-ports/
*/
static void ndpi_search_tailscale(struct ndpi_detection_module_struct *ndpi_struct,
struct ndpi_flow_struct *flow)
{
struct ndpi_packet_struct *packet = &ndpi_struct->packet;
unsigned char magic[6] = { 0x54, 0x53, 0xf0, 0x9f, 0x92, 0xac };
unsigned short port = 41641;
NDPI_LOG_DBG(ndpi_struct, "search Tailscale\n");
if(packet->payload_packet_len > sizeof(magic) &&
(ntohs(flow->c_port) == port || ntohs(flow->s_port) == port) &&
memcmp(packet->payload, magic, sizeof(magic)) == 0) {
NDPI_LOG_INFO(ndpi_struct, "found Tailscale\n");
ndpi_set_detected_protocol(ndpi_struct, flow, NDPI_PROTOCOL_TAILSCALE, NDPI_PROTOCOL_UNKNOWN, NDPI_CONFIDENCE_DPI);
return;
}
NDPI_EXCLUDE_PROTO(ndpi_struct, flow);
}
void init_tailscale_dissector(struct ndpi_detection_module_struct *ndpi_struct,
u_int32_t *id) {
ndpi_set_bitmask_protocol_detection("Tailscale", ndpi_struct, *id,
NDPI_PROTOCOL_TAILSCALE,
ndpi_search_tailscale,
NDPI_SELECTION_BITMASK_PROTOCOL_V4_V6_UDP_WITH_PAYLOAD,
SAVE_DETECTION_BITMASK_AS_UNKNOWN,
ADD_TO_DETECTION_BITMASK);
*id += 1;
}
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