/src/ndpi/src/lib/protocols/roughtime.c

Source
/*
 * roughtime.c
 *
 * Copyright (C) 2024 - 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_ROUGHTIME

#include "ndpi_api.h"
#include "ndpi_private.h"

static u_int32_t const valid_tags[] = {
  0x00444150 /* PAD */,
  0x00474953 /* SIG */,
  0x00524556 /* VER */,
  0x31545544 /* DUT1 */,
  0x434e4f4e /* NONC */,
  0x454c4544 /* DELE */,
  0x48544150 /* PATH */,
  0x49415444 /* DTAI */,
  0x49444152 /* RADI */,
  0x4b425550 /* PUBK */,
  0x5041454c /* LEAP */,
  0x5044494d /* MIDP */,
  0x50455253 /* SREP */,
  0x544e494d /* MINT */,
  0x544f4f52 /* ROOT */,
  0x54524543 /* CERT */,
  0x5458414d /* MAXT */,
  0x58444e49 /* INDX */,
  /*
   * It seems that some implementations are not following the specs
   * by using 0xFF instead of 0x00 as ASCII NUL.
   */
  0xFF444150 /* PAD */,
  0xFF474953 /* SIG */,
  0xFF524556 /* VER */,
  /*
   * Newer drafts may have the following additional tag.
   */
  0x7a7a7a7a /* ZZZZ */,
};

static void ndpi_int_roughtime_add_connection(struct ndpi_detection_module_struct * const ndpi_struct,
                                              struct ndpi_flow_struct * const flow)
{
  NDPI_LOG_INFO(ndpi_struct, "found roughtime\n");
  ndpi_set_detected_protocol(ndpi_struct, flow,
                             NDPI_PROTOCOL_ROUGHTIME,
                             NDPI_PROTOCOL_UNKNOWN,
                             NDPI_CONFIDENCE_DPI);
}

static void ndpi_search_roughtime(struct ndpi_detection_module_struct *ndpi_struct,
                                  struct ndpi_flow_struct *flow)
{
  struct ndpi_packet_struct const * const packet = &ndpi_struct->packet;

  NDPI_LOG_INFO(ndpi_struct, "search roughtime\n");

  if (packet->payload_packet_len < 4)
  {
    NDPI_EXCLUDE_DISSECTOR(ndpi_struct, flow);
    return;
  }

  u_int32_t number_of_tags = le32toh(get_u_int32_t(packet->payload, 0));
  size_t const minimum_length = 4 /* number of tags (N) */ +
                               (number_of_tags - 1) * 4 /* number of tag offsets (N-1) */ +
                               (number_of_tags * 4) /* tags itself (N) */;
  if (number_of_tags < 1 || packet->payload_packet_len < minimum_length ||
      number_of_tags > NDPI_ARRAY_LENGTH(valid_tags))
  {
    NDPI_EXCLUDE_DISSECTOR(ndpi_struct, flow);
    return;
  }

  if (number_of_tags > 1) {
    u_int32_t tag_offset = le32toh(get_u_int32_t(packet->payload, 4 + (number_of_tags - 2) * 4));
    if (packet->payload_packet_len < 4 + (number_of_tags - 1) * 4 + tag_offset)
    {
      NDPI_EXCLUDE_DISSECTOR(ndpi_struct, flow);
      return;
    }
  }

  size_t i;
  for (i = 0; i < number_of_tags; ++i)
  {
    u_int32_t tag = le32toh(get_u_int32_t(packet->payload, 4 + (number_of_tags - 1) * 4 + i * 4));

    size_t j;
    for (j = 0; j < NDPI_ARRAY_LENGTH(valid_tags); ++j)
    {
      if (tag == valid_tags[j])
      {
        break;
      }
    }
    if (j == NDPI_ARRAY_LENGTH(valid_tags))
    {
      NDPI_EXCLUDE_DISSECTOR(ndpi_struct, flow);
      return;
    }
  }

  ndpi_int_roughtime_add_connection(ndpi_struct, flow);
}

void init_roughtime_dissector(struct ndpi_detection_module_struct *ndpi_struct)
{
  ndpi_register_dissector("Roughtime", ndpi_struct,
                     ndpi_search_roughtime,
                     NDPI_SELECTION_BITMASK_PROTOCOL_V4_V6_TCP_OR_UDP_WITH_PAYLOAD_WITHOUT_RETRANSMISSION,
                     1, NDPI_PROTOCOL_ROUGHTIME);
}

Line	Count	Source
1		/*
2		* roughtime.c
3		*
4		* Copyright (C) 2024 - ntop.org
5		*
6		* nDPI is free software: you can redistribute it and/or modify
7		* it under the terms of the GNU Lesser General Public License as published by
8		* the Free Software Foundation, either version 3 of the License, or
9		* (at your option) any later version.
10		*
11		* nDPI is distributed in the hope that it will be useful,
12		* but WITHOUT ANY WARRANTY; without even the implied warranty of
13		* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14		* GNU Lesser General Public License for more details.
15		*
16		* You should have received a copy of the GNU Lesser General Public License
17		* along with nDPI. If not, see <http://www.gnu.org/licenses/>.
18		*
19		*/
20
21
22		#include "ndpi_protocol_ids.h"
23
24		#define NDPI_CURRENT_PROTO NDPI_PROTOCOL_ROUGHTIME
25
26		#include "ndpi_api.h"
27		#include "ndpi_private.h"
28
29		static u_int32_t const valid_tags[] = {
30		0x00444150 /* PAD */,
31		0x00474953 /* SIG */,
32		0x00524556 /* VER */,
33		0x31545544 /* DUT1 */,
34		0x434e4f4e /* NONC */,
35		0x454c4544 /* DELE */,
36		0x48544150 /* PATH */,
37		0x49415444 /* DTAI */,
38		0x49444152 /* RADI */,
39		0x4b425550 /* PUBK */,
40		0x5041454c /* LEAP */,
41		0x5044494d /* MIDP */,
42		0x50455253 /* SREP */,
43		0x544e494d /* MINT */,
44		0x544f4f52 /* ROOT */,
45		0x54524543 /* CERT */,
46		0x5458414d /* MAXT */,
47		0x58444e49 /* INDX */,
48		/*
49		* It seems that some implementations are not following the specs
50		* by using 0xFF instead of 0x00 as ASCII NUL.
51		*/
52		0xFF444150 /* PAD */,
53		0xFF474953 /* SIG */,
54		0xFF524556 /* VER */,
55		/*
56		* Newer drafts may have the following additional tag.
57		*/
58		0x7a7a7a7a /* ZZZZ */,
59		};
60
61		static void ndpi_int_roughtime_add_connection(struct ndpi_detection_module_struct * const ndpi_struct,
62		struct ndpi_flow_struct * const flow)
63	0	{
64	0	NDPI_LOG_INFO(ndpi_struct, "found roughtime\n");
65	0	ndpi_set_detected_protocol(ndpi_struct, flow,
66	0	NDPI_PROTOCOL_ROUGHTIME,
67	0	NDPI_PROTOCOL_UNKNOWN,
68	0	NDPI_CONFIDENCE_DPI);
69	0	}
70
71		static void ndpi_search_roughtime(struct ndpi_detection_module_struct *ndpi_struct,
72		struct ndpi_flow_struct *flow)
73	2.99k	{
74	2.99k	struct ndpi_packet_struct const * const packet = &ndpi_struct->packet;
75
76	2.99k	NDPI_LOG_INFO(ndpi_struct, "search roughtime\n");
77
78	2.99k	if (packet->payload_packet_len < 4)
79	62	{
80	62	NDPI_EXCLUDE_DISSECTOR(ndpi_struct, flow);
81	62	return;
82	62	}
83
84	2.93k	u_int32_t number_of_tags = le32toh(get_u_int32_t(packet->payload, 0));
85	2.93k	size_t const minimum_length = 4 /* number of tags (N) */ +
86	2.93k	(number_of_tags - 1) * 4 /* number of tag offsets (N-1) */ +
87	2.93k	(number_of_tags * 4) /* tags itself (N) */;
88	2.93k	if (number_of_tags < 1 \|\| packet->payload_packet_len < minimum_length \|\|
89	95	number_of_tags > NDPI_ARRAY_LENGTH(valid_tags))
90	2.85k	{
91	2.85k	NDPI_EXCLUDE_DISSECTOR(ndpi_struct, flow);
92	2.85k	return;
93	2.85k	}
94
95	78	if (number_of_tags > 1) {
96	62	u_int32_t tag_offset = le32toh(get_u_int32_t(packet->payload, 4 + (number_of_tags - 2) * 4));
97	62	if (packet->payload_packet_len < 4 + (number_of_tags - 1) * 4 + tag_offset)
98	48	{
99	48	NDPI_EXCLUDE_DISSECTOR(ndpi_struct, flow);
100	48	return;
101	48	}
102	62	}
103
104	30	size_t i;
105	30	for (i = 0; i < number_of_tags; ++i)
106	30	{
107	30	u_int32_t tag = le32toh(get_u_int32_t(packet->payload, 4 + (number_of_tags - 1) * 4 + i * 4));
108
109	30	size_t j;
110	690	for (j = 0; j < NDPI_ARRAY_LENGTH(valid_tags); ++j)
111	660	{
112	660	if (tag == valid_tags[j])
113	0	{
114	0	break;
115	0	}
116	660	}
117	30	if (j == NDPI_ARRAY_LENGTH(valid_tags))
118	30	{
119	30	NDPI_EXCLUDE_DISSECTOR(ndpi_struct, flow);
120	30	return;
121	30	}
122	30	}
123
124	0	ndpi_int_roughtime_add_connection(ndpi_struct, flow);
125	0	}
126
127		void init_roughtime_dissector(struct ndpi_detection_module_struct *ndpi_struct)
128	8.66k	{
129	8.66k	ndpi_register_dissector("Roughtime", ndpi_struct,
130	8.66k	ndpi_search_roughtime,
131	8.66k	NDPI_SELECTION_BITMASK_PROTOCOL_V4_V6_TCP_OR_UDP_WITH_PAYLOAD_WITHOUT_RETRANSMISSION,
132	8.66k	1, NDPI_PROTOCOL_ROUGHTIME);
133	8.66k	}

Coverage Report

Created: 2026-04-04 07:15