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
|
/*
* dicom.c
*
* Copyright (C) 2012-24 - 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_DICOM
#include "ndpi_api.h"
#include "ndpi_private.h"
PACK_ON struct dicom_header {
u_int8_t pdu_type, pad;
u_int32_t pdu_len;
} PACK_OFF;
/* ********************************* */
static void ndpi_search_dicom(struct ndpi_detection_module_struct *ndpi_struct,
struct ndpi_flow_struct *flow) {
struct ndpi_packet_struct *packet = &ndpi_struct->packet;
u_int16_t dicom_port = ntohs(104);
NDPI_LOG_DBG(ndpi_struct, "search DICOM\n");
if(packet->iph && (packet->payload_packet_len > sizeof(struct dicom_header))) {
if(packet->tcp->dest == dicom_port) {
struct dicom_header *h = (struct dicom_header*)packet->payload;
if((h->pdu_type == 0x01 /* A-ASSOCIATE */)
&& (h->pad == 0x0)
&& (packet->payload_packet_len <= (ntohl(h->pdu_len)+6))
&& (packet->payload_packet_len > 9)
&& (packet->payload[6] == 0x0) && (packet->payload[7] == 0x1) /* Protocol Version */
&& (packet->payload[8] == 0x0) && (packet->payload[9] == 0x0) /* Pad */
) {
ndpi_set_detected_protocol(ndpi_struct, flow,
NDPI_PROTOCOL_DICOM,
NDPI_PROTOCOL_UNKNOWN, NDPI_CONFIDENCE_DPI);
} else
NDPI_EXCLUDE_PROTO(ndpi_struct, flow);
} else if(packet->tcp->dest != dicom_port)
NDPI_EXCLUDE_PROTO(ndpi_struct, flow); /* At least one port must be the DICOM port */
} else
NDPI_EXCLUDE_PROTO(ndpi_struct, flow);
}
/* ********************************* */
void init_dicom_dissector(struct ndpi_detection_module_struct *ndpi_struct,
u_int32_t *id) {
ndpi_set_bitmask_protocol_detection("DICOM", ndpi_struct,
*id, NDPI_PROTOCOL_DICOM, ndpi_search_dicom,
NDPI_SELECTION_BITMASK_PROTOCOL_V4_V6_TCP_WITH_PAYLOAD_WITHOUT_RETRANSMISSION,
SAVE_DETECTION_BITMASK_AS_UNKNOWN,
ADD_TO_DETECTION_BITMASK);
*id += 1;
}
|