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/*
* filetopia.c
*
* Copyright (C) 2009-2011 by ipoque GmbH
* Copyright (C) 2011-15 - 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_protocols.h"
#ifdef NDPI_PROTOCOL_FILETOPIA
static void ndpi_int_filetopia_add_connection(struct ndpi_detection_module_struct *ndpi_struct, struct ndpi_flow_struct *flow)
{
ndpi_int_add_connection(ndpi_struct, flow, NDPI_PROTOCOL_FILETOPIA, NDPI_REAL_PROTOCOL);
}
void ndpi_search_filetopia_tcp(struct ndpi_detection_module_struct *ndpi_struct, struct ndpi_flow_struct *flow)
{
struct ndpi_packet_struct *packet = &flow->packet;
// struct ndpi_id_struct *src=ndpi_struct->src;
// struct ndpi_id_struct *dst=ndpi_struct->dst;
if (flow->l4.tcp.filetopia_stage == 0) {
if (packet->payload_packet_len >= 50 && packet->payload_packet_len <= 70
&& packet->payload[0] == 0x03 && packet->payload[1] == 0x9a
&& packet->payload[3] == 0x22 && packet->payload[packet->payload_packet_len - 1] == 0x2b) {
NDPI_LOG(NDPI_PROTOCOL_FILETOPIA, ndpi_struct, NDPI_LOG_DEBUG, "Filetopia stage 1 detected\n");
flow->l4.tcp.filetopia_stage = 1;
return;
}
} else if (flow->l4.tcp.filetopia_stage == 1) {
if (packet->payload_packet_len >= 100 && packet->payload[0] == 0x03
&& packet->payload[1] == 0x9a && (packet->payload[3] == 0x22 || packet->payload[3] == 0x23)) {
int i;
for (i = 0; i < 10; i++) { // check 10 bytes for valid ASCII printable characters
if (!(packet->payload[5 + i] >= 0x20 && packet->payload[5 + i] <= 0x7e)) {
goto end_filetopia_nothing_found;
}
}
NDPI_LOG(NDPI_PROTOCOL_FILETOPIA, ndpi_struct, NDPI_LOG_DEBUG, "Filetopia stage 2 detected\n");
flow->l4.tcp.filetopia_stage = 2;
return;
}
} else if (flow->l4.tcp.filetopia_stage == 2) {
if (packet->payload_packet_len >= 4 && packet->payload_packet_len <= 100
&& packet->payload[0] == 0x03 && packet->payload[1] == 0x9a
&& (packet->payload[3] == 0x22 || packet->payload[3] == 0x23)) {
NDPI_LOG(NDPI_PROTOCOL_FILETOPIA, ndpi_struct, NDPI_LOG_DEBUG, "Filetopia detected\n");
ndpi_int_filetopia_add_connection(ndpi_struct, flow);
return;
}
}
end_filetopia_nothing_found:
NDPI_ADD_PROTOCOL_TO_BITMASK(flow->excluded_protocol_bitmask, NDPI_PROTOCOL_FILETOPIA);
}
#endif
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