/src/ndpi/src/lib/protocols/dlep.c
Line | Count | Source (jump to first uncovered line) |
1 | | /* |
2 | | * dlep.c |
3 | | * |
4 | | * Dynamic Link Exchange Protocol |
5 | | * |
6 | | * Copyright (C) 2024 - ntop.org |
7 | | * Copyright (C) 2024 - V.G <v.gavrilov@securitycode.ru> |
8 | | * |
9 | | * This file is part of nDPI, an open source deep packet inspection |
10 | | * library based on the OpenDPI and PACE technology by ipoque GmbH |
11 | | * |
12 | | * nDPI is free software: you can redistribute it and/or modify |
13 | | * it under the terms of the GNU Lesser General Public License as published by |
14 | | * the Free Software Foundation, either version 3 of the License, or |
15 | | * (at your option) any later version. |
16 | | * |
17 | | * nDPI is distributed in the hope that it will be useful, |
18 | | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
19 | | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
20 | | * GNU Lesser General Public License for more details. |
21 | | * |
22 | | * You should have received a copy of the GNU Lesser General Public License |
23 | | * along with nDPI. If not, see <http://www.gnu.org/licenses/>. |
24 | | * |
25 | | */ |
26 | | |
27 | | #include "ndpi_protocol_ids.h" |
28 | | |
29 | | #define NDPI_CURRENT_PROTO NDPI_PROTOCOL_DLEP |
30 | | |
31 | | #include "ndpi_api.h" |
32 | | #include "ndpi_private.h" |
33 | | |
34 | | static void ndpi_int_dlep_add_connection(struct ndpi_detection_module_struct *ndpi_struct, |
35 | | struct ndpi_flow_struct *flow) |
36 | 0 | { |
37 | 0 | NDPI_LOG_INFO(ndpi_struct, "found DLEP\n"); |
38 | 0 | ndpi_set_detected_protocol(ndpi_struct, flow, |
39 | 0 | NDPI_PROTOCOL_DLEP, NDPI_PROTOCOL_UNKNOWN, |
40 | 0 | NDPI_CONFIDENCE_DPI); |
41 | 0 | } |
42 | | |
43 | | static void ndpi_search_dlep(struct ndpi_detection_module_struct *ndpi_struct, |
44 | | struct ndpi_flow_struct *flow) |
45 | 2.63k | { |
46 | 2.63k | struct ndpi_packet_struct const * const packet = &ndpi_struct->packet; |
47 | | |
48 | 2.63k | NDPI_LOG_DBG(ndpi_struct, "search DLEP\n"); |
49 | | |
50 | 2.63k | if (packet->udp != NULL && packet->payload_packet_len > 27) { |
51 | 608 | if ((memcmp(packet->payload, "DLEP", 4) == 0)) { |
52 | 0 | ndpi_int_dlep_add_connection(ndpi_struct, flow); |
53 | 0 | return; |
54 | 0 | } |
55 | 2.02k | } else if (packet->tcp != NULL) { |
56 | | /* Maybe it's unnecessary, but it'll definitely eliminate any false positives. |
57 | | * 854 port is IANA registered for DLEP. */ |
58 | 1.93k | if (packet->payload_packet_len > 8 && |
59 | 1.93k | (ntohs(packet->tcp->dest) == 854 || ntohs(packet->tcp->source) == 854)) |
60 | 1 | { |
61 | 1 | if (ntohs(get_u_int16_t(packet->payload, 0)) < 0x11 && |
62 | 1 | ntohs(get_u_int16_t(packet->payload, 2)) == (u_int16_t)(packet->payload_packet_len-4)) |
63 | 0 | { |
64 | 0 | ndpi_int_dlep_add_connection(ndpi_struct, flow); |
65 | 0 | return; |
66 | 0 | } |
67 | 1 | } |
68 | 1.93k | } |
69 | | |
70 | 2.63k | NDPI_EXCLUDE_DISSECTOR(ndpi_struct, flow); |
71 | 2.63k | } |
72 | | |
73 | | void init_dlep_dissector(struct ndpi_detection_module_struct *ndpi_struct) |
74 | 8.01k | { |
75 | 8.01k | register_dissector("DLEP", ndpi_struct, |
76 | 8.01k | ndpi_search_dlep, |
77 | 8.01k | NDPI_SELECTION_BITMASK_PROTOCOL_V4_V6_TCP_OR_UDP_WITH_PAYLOAD_WITHOUT_RETRANSMISSION, |
78 | 8.01k | 1, NDPI_PROTOCOL_DLEP); |
79 | 8.01k | } |