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
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
|
/*
* usenet.c
*
* Copyright (C) 2009-11 - ipoque GmbH
* Copyright (C) 2011-22 - 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_USENET
#include "ndpi_api.h"
#include "ndpi_private.h"
static void ndpi_int_usenet_add_connection(struct ndpi_detection_module_struct
*ndpi_struct, struct ndpi_flow_struct *flow)
{
ndpi_set_detected_protocol(ndpi_struct, flow, NDPI_PROTOCOL_USENET, NDPI_PROTOCOL_UNKNOWN, NDPI_CONFIDENCE_DPI);
}
static void ndpi_search_usenet_tcp(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 usenet\n");
NDPI_LOG_DBG2(ndpi_struct, "STAGE IS %u\n", flow->l4.tcp.usenet_stage);
// check for the first server replay
/*
200 Service available, posting allowed
201 Service available, posting prohibited
*/
if (flow->l4.tcp.usenet_stage == 0 && packet->payload_packet_len > 10
&& ((memcmp(packet->payload, "200 ", 4) == 0)
|| (memcmp(packet->payload, "201 ", 4) == 0))) {
NDPI_LOG_DBG2(ndpi_struct, "found 200 or 201\n");
flow->l4.tcp.usenet_stage = 1 + packet->packet_direction;
NDPI_LOG_DBG2(ndpi_struct, "maybe hit\n");
return;
}
/*
[C] AUTHINFO USER fred
[S] 381 Enter passphrase
[C] AUTHINFO PASS flintstone
[S] 281 Authentication accepted
*/
// check for client username
if (flow->l4.tcp.usenet_stage == 2 - packet->packet_direction) {
if (packet->payload_packet_len > 20 && (memcmp(packet->payload, "AUTHINFO USER ", 14) == 0)) {
NDPI_LOG_DBG2(ndpi_struct, "username found\n");
flow->l4.tcp.usenet_stage = 3 + packet->packet_direction;
NDPI_LOG_INFO(ndpi_struct, "found usenet\n");
ndpi_int_usenet_add_connection(ndpi_struct, flow);
return;
} else if (packet->payload_packet_len == 13 && (memcmp(packet->payload, "MODE READER\r\n", 13) == 0)) {
NDPI_LOG_DBG2(ndpi_struct,
"no login necessary but we are a client.\n");
NDPI_LOG_INFO(ndpi_struct, "found usenet\n");
ndpi_int_usenet_add_connection(ndpi_struct, flow);
return;
} else if (packet->payload_packet_len == 6 && (memcmp(packet->payload, "HELP\r\n", 6) == 0)) {
NDPI_LOG_INFO(ndpi_struct, "found usenet\n");
ndpi_int_usenet_add_connection(ndpi_struct, flow);
return;
}
}
NDPI_EXCLUDE_PROTO(ndpi_struct, flow);
}
void init_usenet_dissector(struct ndpi_detection_module_struct *ndpi_struct, u_int32_t *id)
{
ndpi_set_bitmask_protocol_detection("Usenet", ndpi_struct, *id,
NDPI_PROTOCOL_USENET,
ndpi_search_usenet_tcp,
NDPI_SELECTION_BITMASK_PROTOCOL_V4_V6_TCP_WITH_PAYLOAD_WITHOUT_RETRANSMISSION,
SAVE_DETECTION_BITMASK_AS_UNKNOWN,
ADD_TO_DETECTION_BITMASK);
*id += 1;
}
|