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/*
* 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_PROTO(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_PROTO(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_PROTO(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_PROTO(ndpi_struct, flow);
return;
}
}
ndpi_int_roughtime_add_connection(ndpi_struct, flow);
}
void init_roughtime_dissector(struct ndpi_detection_module_struct *ndpi_struct,
u_int32_t *id)
{
ndpi_set_bitmask_protocol_detection("Roughtime", ndpi_struct, *id,
NDPI_PROTOCOL_ROUGHTIME,
ndpi_search_roughtime,
NDPI_SELECTION_BITMASK_PROTOCOL_V4_V6_TCP_OR_UDP_WITH_PAYLOAD_WITHOUT_RETRANSMISSION,
SAVE_DETECTION_BITMASK_AS_UNKNOWN,
ADD_TO_DETECTION_BITMASK
);
*id += 1;
}
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