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
|
/*
* mssql.c
*
* Copyright (C) 2016-22 - 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_MSSQL_TDS
#include "ndpi_api.h"
struct tds_packet_header {
u_int8_t type;
u_int8_t status;
u_int16_t length;
u_int16_t channel;
u_int8_t number;
u_int8_t window;
};
static void ndpi_int_mssql_tds_add_connection(struct ndpi_detection_module_struct
*ndpi_struct, struct ndpi_flow_struct *flow)
{
ndpi_set_detected_protocol(ndpi_struct, flow, NDPI_PROTOCOL_MSSQL_TDS, NDPI_PROTOCOL_UNKNOWN);
}
void ndpi_search_mssql_tds(struct ndpi_detection_module_struct *ndpi_struct, struct ndpi_flow_struct *flow)
{
struct ndpi_packet_struct *packet = &ndpi_struct->packet;
struct tds_packet_header *h = (struct tds_packet_header*) packet->payload;
NDPI_LOG_DBG(ndpi_struct, "search mssql_tds\n");
if((packet->payload_packet_len < sizeof(struct tds_packet_header))
/*
The TPKT protocol used by ISO 8072 (on port 102) is similar
to this potocol and it can cause false positives
*/
|| (packet->tcp->dest == ntohs(102))) {
NDPI_EXCLUDE_PROTO(ndpi_struct, flow);
return;
}
if((h->type >= 1 && h->type <= 8) || (h->type >= 14 && h->type <= 18)) {
if(h->status == 0x00 || h->status == 0x01 || h->status == 0x02 || h->status == 0x04 || h->status == 0x08 || h->status == 0x09 || h->status == 0x10) {
if(ntohs(h->length) == packet->payload_packet_len && h->window == 0x00) {
NDPI_LOG_INFO(ndpi_struct, "found mssql_tds\n");
ndpi_int_mssql_tds_add_connection(ndpi_struct, flow);
return;
}
}
}
NDPI_EXCLUDE_PROTO(ndpi_struct, flow);
}
void init_mssql_tds_dissector(struct ndpi_detection_module_struct *ndpi_struct, u_int32_t *id, NDPI_PROTOCOL_BITMASK *detection_bitmask)
{
ndpi_set_bitmask_protocol_detection("MsSQL_TDS", ndpi_struct, detection_bitmask, *id,
NDPI_PROTOCOL_MSSQL_TDS,
ndpi_search_mssql_tds,
NDPI_SELECTION_BITMASK_PROTOCOL_V4_V6_TCP_WITH_PAYLOAD_WITHOUT_RETRANSMISSION,
SAVE_DETECTION_BITMASK_AS_UNKNOWN,
ADD_TO_DETECTION_BITMASK);
*id += 1;
}
|