1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
|
/*
* ciscovpn.c
*
* Copyright (C) 2013-22 - 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/>.
*
* Dissector developed by Remy Mudingay <mudingay@ill.fr>
*
*/
#include "ndpi_protocol_ids.h"
#define NDPI_CURRENT_PROTO NDPI_PROTOCOL_CISCOVPN
#include "ndpi_api.h"
#include "ndpi_private.h"
/* ****************************************************************** */
static void ndpi_int_ciscovpn_add_connection(struct ndpi_detection_module_struct *ndpi_struct, struct ndpi_flow_struct *flow)
{
ndpi_set_detected_protocol(ndpi_struct, flow, NDPI_PROTOCOL_CISCOVPN, NDPI_PROTOCOL_UNKNOWN, NDPI_CONFIDENCE_DPI);
}
/* ****************************************************************** */
static void ndpi_search_ciscovpn(struct ndpi_detection_module_struct *ndpi_struct, struct ndpi_flow_struct *flow)
{
struct ndpi_packet_struct *packet = &ndpi_struct->packet;
u_int16_t udport, usport;
NDPI_LOG_DBG(ndpi_struct, "search CISCOVPN\n");
usport = ntohs(packet->udp->source), udport = ntohs(packet->udp->dest);
if((usport == 10000 && udport == 10000)) {
if((packet->payload_packet_len >= 4) &&
(packet->payload[0] == 0xfe &&
packet->payload[1] == 0x57 &&
packet->payload[2] == 0x7e &&
packet->payload[3] == 0x2b)
) {
/* This is a good query fe577e2b */
NDPI_LOG_INFO(ndpi_struct, "found CISCOVPN\n");
ndpi_int_ciscovpn_add_connection(ndpi_struct, flow);
return;
}
if(flow->num_processed_pkts > 5)
NDPI_EXCLUDE_PROTO(ndpi_struct, flow);
} else
NDPI_EXCLUDE_PROTO(ndpi_struct, flow);
}
void init_ciscovpn_dissector(struct ndpi_detection_module_struct *ndpi_struct, u_int32_t *id)
{
ndpi_set_bitmask_protocol_detection("CiscoVPN", ndpi_struct, *id,
NDPI_PROTOCOL_CISCOVPN,
ndpi_search_ciscovpn,
NDPI_SELECTION_BITMASK_PROTOCOL_V4_V6_UDP_WITH_PAYLOAD,
SAVE_DETECTION_BITMASK_AS_UNKNOWN,
ADD_TO_DETECTION_BITMASK);
*id += 1;
}
|