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
|
/*
* gnutella.c
*
* Copyright (C) 2009-11 - ipoque GmbH
* Copyright (C) 2011-25 - 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_GNUTELLA
#include "ndpi_api.h"
#include "ndpi_private.h"
static void ndpi_int_gnutella_add_connection(struct ndpi_detection_module_struct *ndpi_struct,
struct ndpi_flow_struct *flow,
ndpi_confidence_t confidence)
{
NDPI_LOG_INFO(ndpi_struct, "found GNUTELLA\n");
ndpi_set_detected_protocol_keeping_master(ndpi_struct, flow, NDPI_PROTOCOL_GNUTELLA,
confidence);
}
static void ndpi_search_gnutella(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 GNUTELLA\n");
if (packet->tcp != NULL) {
if (packet->payload_packet_len > 17 && memcmp(packet->payload, "GNUTELLA CONNECT/", 17) == 0) {
ndpi_int_gnutella_add_connection(ndpi_struct, flow, NDPI_CONFIDENCE_DPI);
/* Extract some metadata HTTP-like */
ndpi_parse_packet_line_info(ndpi_struct, flow);
if(packet->user_agent_line.ptr != NULL)
ndpi_user_agent_set(flow, packet->user_agent_line.ptr, packet->user_agent_line.len);
return;
}
} else if (packet->udp != NULL) {
/* Check for Mojito-DHT encapsulated gnutella (gtk-gnutella). */
if (packet->payload_packet_len > 23) {
u_int32_t gnutella_payload_len = le32toh(get_u_int32_t(packet->payload, 19));
if (gnutella_payload_len == (u_int32_t)packet->payload_packet_len - 23 &&
((packet->payload_packet_len > 27 &&
ntohl(get_u_int32_t(packet->payload, 24)) == 0x47544b47 /* GTKG */) ||
ntohl(get_u_int32_t(packet->payload, packet->payload_packet_len - 4)) == 0x82514b40)) {
NDPI_LOG_DBG2(ndpi_struct, "detected mojito-dht/gnutella udp\n");
ndpi_int_gnutella_add_connection(ndpi_struct, flow, NDPI_CONFIDENCE_DPI);
return;
}
}
if (packet->payload_packet_len >= 4 && memcmp(packet->payload, "GND\x10", 4) == 0) {
NDPI_LOG_DBG2(ndpi_struct, "detected gnutella udp, GND (2)\n");
ndpi_int_gnutella_add_connection(ndpi_struct, flow, NDPI_CONFIDENCE_DPI);
return;
}
}
NDPI_EXCLUDE_DISSECTOR(ndpi_struct, flow);
}
void init_gnutella_dissector(struct ndpi_detection_module_struct *ndpi_struct)
{
register_dissector("Gnutella", ndpi_struct,
ndpi_search_gnutella,
NDPI_SELECTION_BITMASK_PROTOCOL_V4_V6_TCP_OR_UDP_WITH_PAYLOAD_WITHOUT_RETRANSMISSION,
1, NDPI_PROTOCOL_GNUTELLA);
}
|