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/*
* fiesta.c
*
* Copyright (C) 2009-11 - ipoque GmbH
* Copyright (C) 2011-22 - 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_FIESTA
#include "ndpi_api.h"
static void ndpi_int_fiesta_add_connection(struct ndpi_detection_module_struct *ndpi_struct, struct ndpi_flow_struct *flow)
{
ndpi_set_detected_protocol(ndpi_struct, flow, NDPI_PROTOCOL_FIESTA, NDPI_PROTOCOL_UNKNOWN, NDPI_CONFIDENCE_DPI);
}
void ndpi_search_fiesta(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 fiesta\n");
if (flow->l4.tcp.fiesta_stage == 0 && packet->payload_packet_len == 5
&& get_u_int16_t(packet->payload, 0) == ntohs(0x0407)
&& (packet->payload[2] == 0x08)
&& (packet->payload[4] == 0x00 || packet->payload[4] == 0x01)) {
NDPI_LOG_DBG2(ndpi_struct, "maybe fiesta symmetric, first packet\n");
flow->l4.tcp.fiesta_stage = 1 + packet->packet_direction;
goto maybe_fiesta;
}
if (flow->l4.tcp.fiesta_stage == (2 - packet->packet_direction)
&& ((packet->payload_packet_len > 1 && packet->payload_packet_len - 1 == packet->payload[0])
|| (packet->payload_packet_len > 3 && packet->payload[0] == 0
&& get_l16(packet->payload, 1) == packet->payload_packet_len - 3))) {
NDPI_LOG_DBG2(ndpi_struct, "Maybe fiesta\n");
goto maybe_fiesta;
}
if (flow->l4.tcp.fiesta_stage == (1 + packet->packet_direction)) {
if (packet->payload_packet_len == 4 && get_u_int32_t(packet->payload, 0) == htonl(0x03050c01)) {
goto add_fiesta;
}
if (packet->payload_packet_len == 5 && get_u_int32_t(packet->payload, 0) == htonl(0x04030c01)
&& packet->payload[4] == 0) {
goto add_fiesta;
}
if (packet->payload_packet_len == 6 && get_u_int32_t(packet->payload, 0) == htonl(0x050e080b)) {
goto add_fiesta;
}
if (packet->payload_packet_len == 100 && packet->payload[0] == 0x63 && packet->payload[61] == 0x52
&& packet->payload[81] == 0x5a && get_u_int16_t(packet->payload, 1) == htons(0x3810)
&& get_u_int16_t(packet->payload, 62) == htons(0x6f75)) {
goto add_fiesta;
}
if (packet->payload_packet_len > 3 && packet->payload_packet_len - 1 == packet->payload[0]
&& get_u_int16_t(packet->payload, 1) == htons(0x140c)) {
goto add_fiesta;
}
}
NDPI_EXCLUDE_PROTO(ndpi_struct, flow);
return;
maybe_fiesta:
NDPI_LOG_DBG2(ndpi_struct, "Stage is set to %d\n", flow->l4.tcp.fiesta_stage);
return;
add_fiesta:
NDPI_LOG_INFO(ndpi_struct, "found fiesta\n");
ndpi_int_fiesta_add_connection(ndpi_struct, flow);
return;
}
void init_fiesta_dissector(struct ndpi_detection_module_struct *ndpi_struct, u_int32_t *id, NDPI_PROTOCOL_BITMASK *detection_bitmask)
{
ndpi_set_bitmask_protocol_detection("Fiesta", ndpi_struct, detection_bitmask, *id,
NDPI_PROTOCOL_FIESTA,
ndpi_search_fiesta,
NDPI_SELECTION_BITMASK_PROTOCOL_V4_V6_TCP_WITH_PAYLOAD_WITHOUT_RETRANSMISSION,
SAVE_DETECTION_BITMASK_AS_UNKNOWN,
ADD_TO_DETECTION_BITMASK);
*id += 1;
}
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