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
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
|
/*
* ppstream.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_PPSTREAM
#include "ndpi_api.h"
#include "ndpi_private.h"
#define PPS_PORT 17788
static void ndpi_int_ppstream_add_connection(struct ndpi_detection_module_struct
*ndpi_struct, struct ndpi_flow_struct *flow)
{
ndpi_set_detected_protocol(ndpi_struct, flow, NDPI_PROTOCOL_PPSTREAM, NDPI_PROTOCOL_UNKNOWN, NDPI_CONFIDENCE_DPI);
NDPI_LOG_INFO(ndpi_struct, "found PPStream over UDP\n");
}
static void ndpi_search_ppstream(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 PPStream\n");
/**
PPS over TCP is detected inside HTTP dissector
*/
/* check PPS over UDP */
if(packet->udp != NULL) {
/*** on port 17788 ***/
if(packet->payload_packet_len > 14 && ((ntohs(packet->udp->source) == PPS_PORT) || (ntohs(packet->udp->dest) == PPS_PORT))) {
if(((packet->payload_packet_len - 4 == get_l16(packet->payload, 0))
|| (packet->payload_packet_len == get_l16(packet->payload, 0))
|| (packet->payload_packet_len >= 6 && packet->payload_packet_len - 6 == get_l16(packet->payload, 0)))) {
/* check 43 and */
if(packet->payload[2] == 0x43) {
if(packet->payload[5] == 0xff &&
packet->payload[6] == 0x00 &&
packet->payload[7] == 0x01 &&
packet->payload[8] == 0x00 &&
packet->payload[9] == 0x00 &&
packet->payload[10] == 0x00 &&
packet->payload[11] == 0x00 &&
packet->payload[12] == 0x00 &&
packet->payload[13] == 0x00 &&
packet->payload[14] == 0x00) {
ndpi_int_ppstream_add_connection(ndpi_struct, flow);
return;
}
}
/* check 44 */
else if(packet->payload[2] == 0x44 && packet->payload_packet_len > 20) {
/** b1 71 **/
if(packet->payload[3] == 0xb1 && packet->payload[4] == 0x71) {
if(packet->payload[13] == 0x00 &&
packet->payload[14] == 0x00 &&
packet->payload[15] == 0x01 &&
packet->payload[16] == 0x00) {
/* 02 03 04 05 */
if(packet->payload[17] == 0x02 ||
packet->payload[17] == 0x03 ||
packet->payload[17] == 0x04 ||
packet->payload[17] == 0x05) {
if(packet->payload[18] == 0x00 &&
packet->payload[19] == 0x00 &&
packet->payload[20] == 0x00) {
ndpi_int_ppstream_add_connection(ndpi_struct, flow);
return;
}
}
/* ff */
else if(packet->payload[17] == 0xff) {
if(packet->payload[18] == 0xff &&
packet->payload[19] == 0xff &&
packet->payload[20] == 0xff) {
ndpi_int_ppstream_add_connection(ndpi_struct, flow);
return;
}
}
}
}
/** 73 17 **/
else if(packet->payload[3] == 0x73 && packet->payload[4] == 0x17) {
if(packet->payload[5] == 0x00 &&
packet->payload[6] == 0x00 &&
packet->payload[7] == 0x00 &&
packet->payload[8] == 0x00 &&
packet->payload[14] == 0x00 &&
packet->payload[15] == 0x00 &&
packet->payload[16] == 0x00 &&
packet->payload[17] == 0x00 &&
packet->payload[18] == 0x00 &&
packet->payload[19] == 0x00 &&
packet->payload[20] == 0x00) {
ndpi_int_ppstream_add_connection(ndpi_struct, flow);
return;
}
}
/** 74 71 **/
else if(packet->payload[3] == 0x74 && packet->payload[4] == 0x71 && packet->payload_packet_len == 113) {
/* check "PPStream" string in hex */
if(packet->payload[94] == 0x50 &&
packet->payload[95] == 0x50 &&
packet->payload[96] == 0x53 &&
packet->payload[97] == 0x74 &&
packet->payload[98] == 0x72 &&
packet->payload[99] == 0x65 &&
packet->payload[100] == 0x61 &&
packet->payload[101] == 0x6d) {
ndpi_int_ppstream_add_connection(ndpi_struct, flow);
return;
}
}
}
/** check 55 (1) **/
else if(packet->payload_packet_len > 20 &&
packet->payload[2] == 0x55 && (packet->payload[13] == 0x1b &&
packet->payload[14] == 0xa0 &&
packet->payload[15] == 0x00 &&
packet->payload[16] == 0x00 &&
packet->payload[17] == 0x00 &&
packet->payload[18] == 0x00 &&
packet->payload[19] == 0x00 &&
packet->payload[20] == 0x00 )) {
ndpi_int_ppstream_add_connection(ndpi_struct, flow);
return;
}
/** check 55 (2) **/
else if(packet->payload_packet_len > 20 &&
packet->payload[2] == 0x55 && packet->payload[1] == 0x00 &&
(packet->payload[5] == 0x00 &&
packet->payload[6] == 0x00 &&
packet->payload[7] == 0x00 &&
packet->payload[8] == 0x00 &&
packet->payload[14] == 0x00 &&
packet->payload[15] == 0x00 &&
packet->payload[16] == 0x00 &&
packet->payload[17] == 0x00 &&
packet->payload[18] == 0x00 &&
packet->payload[19] == 0x00 &&
packet->payload[20] == 0x00 )) {
ndpi_int_ppstream_add_connection(ndpi_struct, flow);
return;
}
}
/* No port detection */
if(packet->payload_packet_len > 17) {
/* 80 */
if(packet->payload[1] == 0x80 || packet->payload[1] == 0x84 ) {
if(packet->payload[3] == packet->payload[4]) {
ndpi_int_ppstream_add_connection(ndpi_struct, flow);
return;
}
}
/* 53 */
else if(packet->payload[1] == 0x53 && packet->payload[3] == 0x00 &&
(packet->payload[0] == 0x08 || packet->payload[0] == 0x0c)) {
ndpi_int_ppstream_add_connection(ndpi_struct, flow);
return;
}
}
}
NDPI_EXCLUDE_PROTO(ndpi_struct, flow);
}
}
void init_ppstream_dissector(struct ndpi_detection_module_struct *ndpi_struct, u_int32_t *id)
{
ndpi_set_bitmask_protocol_detection("PPStream", ndpi_struct, *id,
NDPI_PROTOCOL_PPSTREAM,
ndpi_search_ppstream,
NDPI_SELECTION_BITMASK_PROTOCOL_V4_V6_UDP_WITH_PAYLOAD,
SAVE_DETECTION_BITMASK_AS_UNKNOWN,
ADD_TO_DETECTION_BITMASK);
*id += 1;
}
|