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
214
215
216
217
218
219
220
221
|
/*
* zattoo.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_ZATTOO
#include "ndpi_api.h"
#include "ndpi_private.h"
#if !defined(WIN32)
static inline
#elif defined(MINGW_GCC)
__mingw_forceinline static
#else
__forceinline static
#endif
u_int8_t ndpi_int_zattoo_user_agent_set(struct ndpi_detection_module_struct *ndpi_struct)
{
struct ndpi_packet_struct *packet = &ndpi_struct->packet;
if(packet->user_agent_line.ptr != NULL && packet->user_agent_line.len == 111) {
if(memcmp(packet->user_agent_line.ptr + packet->user_agent_line.len - 25, "Zattoo/4", sizeof("Zattoo/4") - 1) == 0) {
NDPI_LOG_DBG(ndpi_struct, "found zattoo useragent\n");
return 1;
}
}
return 0;
}
#define ZATTOO_DETECTED \
ndpi_set_detected_protocol(ndpi_struct, flow, NDPI_PROTOCOL_ZATTOO, NDPI_PROTOCOL_UNKNOWN, NDPI_CONFIDENCE_DPI /* TODO */)
static void ndpi_search_zattoo(struct ndpi_detection_module_struct *ndpi_struct, struct ndpi_flow_struct *flow)
{
struct ndpi_packet_struct *packet = &ndpi_struct->packet;
u_int16_t i;
NDPI_LOG_DBG(ndpi_struct, "search ZATTOO\n");
/* search over TCP */
if(packet->tcp != NULL) {
if(packet->payload_packet_len > 50 && memcmp(packet->payload, "GET /frontdoor/fd?brand=Zattoo&v=", 33) == 0) {
NDPI_LOG_INFO(ndpi_struct, "found zattoo. add connection over tcp with pattern GET /frontdoor/fd?brand=Zattoo&v=\n");
ZATTOO_DETECTED;
return;
}
if(packet->payload_packet_len > 50 && memcmp(packet->payload, "GET /ZattooAdRedirect/redirect.jsp?user=", 40) == 0) {
NDPI_LOG_INFO(ndpi_struct, "found zattoo. add connection over tcp with pattern GET /ZattooAdRedirect/redirect.jsp?user=\n");
ZATTOO_DETECTED;
return;
}
if(packet->payload_packet_len > 50 && (memcmp(packet->payload, "POST /channelserver/player/channel/update HTTP/1.1", 50) == 0
|| memcmp(packet->payload, "GET /epg/query", 14) == 0)) {
ndpi_parse_packet_line_info(ndpi_struct, flow);
for(i = 0; i < packet->parsed_lines; i++) {
if(packet->line[i].len >= 18 && (memcmp(packet->line[i].ptr, "User-Agent: Zattoo", 18) == 0)) {
NDPI_LOG_INFO(ndpi_struct, "found zattoo. add connection over tcp with pattern POST /channelserver/player/channel/update HTTP/1.1\n");
ZATTOO_DETECTED;
return;
}
}
} else if(packet->payload_packet_len > 50 && (memcmp(packet->payload, "GET /", 5) == 0 || memcmp(packet->payload, "POST /", NDPI_STATICSTRING_LEN("POST /")) == 0)) {
/* TODO to avoid searching currently only a specific length and offset is used
* that might be changed later */
ndpi_parse_packet_line_info(ndpi_struct, flow);
if(ndpi_int_zattoo_user_agent_set(ndpi_struct)) {
NDPI_LOG_INFO(ndpi_struct, "found zattoo. add connection over tcp with pattern GET / or POST /\n");
ZATTOO_DETECTED;
return;
}
} else if(packet->payload_packet_len > 50 && memcmp(packet->payload, "POST http://", 12) == 0) {
ndpi_parse_packet_line_info(ndpi_struct, flow);
// test for unique character of the zattoo header
if(packet->parsed_lines == 4 && packet->host_line.ptr != NULL && packet->iph) {
u_int32_t ip;
u_int16_t bytes_read = 0;
ip = ndpi_bytestream_to_ipv4(&packet->payload[12], packet->payload_packet_len, &bytes_read);
// and now test the firt 5 bytes of the payload for zattoo pattern
if(ip == packet->iph->daddr
&& packet->empty_line_position_set != 0
&& ((packet->payload_packet_len - packet->empty_line_position) > 10)
&& packet->payload[packet->empty_line_position + 2] ==
0x03
&& packet->payload[packet->empty_line_position + 3] ==
0x04
&& packet->payload[packet->empty_line_position + 4] ==
0x00
&& packet->payload[packet->empty_line_position + 5] ==
0x04
&& packet->payload[packet->empty_line_position + 6] ==
0x0a && packet->payload[packet->empty_line_position + 7] == 0x00) {
NDPI_LOG_INFO(ndpi_struct, "found zattoo. add connection over tcp with pattern POST http://\n");
ZATTOO_DETECTED;
return;
}
}
} else if(flow->zattoo_stage == 0) {
if(packet->payload_packet_len > 50
&& packet->payload[0] == 0x03
&& packet->payload[1] == 0x04
&& packet->payload[2] == 0x00
&& packet->payload[3] == 0x04 && packet->payload[4] == 0x0a && packet->payload[5] == 0x00) {
flow->zattoo_stage = 1 + packet->packet_direction;
NDPI_LOG_DBG2(ndpi_struct, "need next packet, seen pattern 0x030400040a00\n");
return;
}
/* the following is searching for flash, not for zattoo. */
} else if(flow->zattoo_stage == 2 - packet->packet_direction && packet->payload_packet_len > 50 && packet->payload[0] == 0x03 && packet->payload[1] == 0x04) {
NDPI_LOG_INFO(ndpi_struct, "found zattoo. add connection over tcp with 0x0304\n");
ZATTOO_DETECTED;
return;
} else if(flow->zattoo_stage == 1 + packet->packet_direction) {
if(packet->payload_packet_len > 500 && packet->payload[0] == 0x00 && packet->payload[1] == 0x00) {
flow->zattoo_stage = 3 + packet->packet_direction;
NDPI_LOG_DBG2(ndpi_struct, "need next packet, seen pattern 0x0000\n");
return;
}
#if 0
if(packet->payload_packet_len > 50
&& packet->payload[0] == 0x03
&& packet->payload[1] == 0x04
&& packet->payload[2] == 0x00
&& packet->payload[3] == 0x04 && packet->payload[4] == 0x0a && packet->payload[5] == 0x00) {
}
#endif
NDPI_LOG_DBG2(ndpi_struct, "need next packet, seen pattern 0x030400040a00\n");
return;
} else if(flow->zattoo_stage == 4 - packet->packet_direction && packet->payload_packet_len > 50 && packet->payload[0] == 0x03 && packet->payload[1] == 0x04) {
NDPI_LOG_INFO(ndpi_struct, "found zattoo. add connection over tcp with 0x0304\n");
ZATTOO_DETECTED;
return;
}
NDPI_LOG_DBG2(ndpi_struct,
"ZATTOO: discarded the flow (TCP): packet_size: %u; Flowstage: %u\n",
packet->payload_packet_len, flow->zattoo_stage);
}
/* search over UDP */
else if(packet->udp != NULL) {
if(packet->payload_packet_len > 20 && (packet->udp->dest == htons(5003) || packet->udp->source == htons(5003))
&& (get_u_int16_t(packet->payload, 0) == htons(0x037a)
|| get_u_int16_t(packet->payload, 0) == htons(0x0378)
|| get_u_int16_t(packet->payload, 0) == htons(0x0305)
|| get_u_int32_t(packet->payload, 0) == htonl(0x03040004)
|| get_u_int32_t(packet->payload, 0) == htonl(0x03010005))) {
if(++flow->zattoo_stage == 2) {
NDPI_LOG_INFO(ndpi_struct, "found zattoo. add connection over udp\n");
ZATTOO_DETECTED;
return;
}
NDPI_LOG_DBG2(ndpi_struct, "need next packet udp\n");
return;
}
NDPI_LOG_DBG2(ndpi_struct,
"ZATTOO: discarded the flow (UDP): packet_size: %u; Flowstage: %u\n",
packet->payload_packet_len, flow->zattoo_stage);
}
NDPI_EXCLUDE_PROTO(ndpi_struct, flow);
}
void init_zattoo_dissector(struct ndpi_detection_module_struct *ndpi_struct, u_int32_t *id)
{
ndpi_set_bitmask_protocol_detection("Zattoo", ndpi_struct, *id,
NDPI_PROTOCOL_ZATTOO,
ndpi_search_zattoo,
NDPI_SELECTION_BITMASK_PROTOCOL_V4_V6_TCP_OR_UDP_WITH_PAYLOAD_WITHOUT_RETRANSMISSION,
SAVE_DETECTION_BITMASK_AS_UNKNOWN,
ADD_TO_DETECTION_BITMASK);
*id += 1;
}
|