/*
* edonkey.c
*
* Copyright (C) 2014 Tomasz Bujlow <tomasz@skatnet.dk>
*
* The signature is based on the Libprotoident library.
*
* 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_EDONKEY
#include "ndpi_api.h"
static void ndpi_int_edonkey_add_connection(struct ndpi_detection_module_struct *ndpi_struct, struct ndpi_flow_struct *flow) {
ndpi_set_detected_protocol(ndpi_struct, flow, NDPI_PROTOCOL_EDONKEY, NDPI_PROTOCOL_UNKNOWN, NDPI_CONFIDENCE_DPI);
}
static int ndpi_edonkey_payload_check(const u_int8_t *data, u_int32_t len) {
if((len >= 4) && (data[0] == 0xe3) && (data[2] == 0x00) && (data[3] == 0x00))
return 1;
if((len >= 4) && (data[0] == 0xc5) && (data[2] == 0x00) && (data[3] == 0x00))
return 1;
if((len >= 2) && (data[0] == 0xe5) && (data[1] == 0x43))
return 1;
if((len >= 4) && (data[0] == 0xe5) && (data[1] == 0x08) && (data[2] == 0x78) && (data[3] == 0xda))
return 1;
if((len >= 4) && (data[0] == 0xe5) && (data[1] == 0x28) && (data[2] == 0x78) && (data[3] == 0xda))
return 1;
if((len >= 2) && (data[0] == 0xc5) && (data[1] == 0x90))
return 1;
if((len >= 2) && (data[0] == 0xc5) && (data[1] == 0x91))
return 1;
if((len == 2) && (data[0] == 0xc5) && (data[1] == 0x92))
return 1;
if((len == 2) && (data[0] == 0xc5) && (data[1] == 0x93))
return 1;
if((len >= 38 && len <= 70) && (data[0] == 0xc5) && (data[1] == 0x94))
return 1;
if((len >= 2) && (data[0] == 0xe3) && (data[1] == 0x9a))
return 1;
if((len >= 2) && (data[0] == 0xe3) && (data[1] == 0x9b))
return 1;
if((len == 6) && (data[0] == 0xe3) && (data[1] == 0x96))
return 1;
if((len <= 34 && ((len - 2) % 4 == 0)) && (data[0] == 0xe3) && (data[1] == 0x97))
return 1;
if((len >= 2) && (data[0] == 0xe3) && (data[1] == 0x92))
return 1;
if((len >= 2) && (data[0] == 0xe3) && (data[1] == 0x94))
return 1;
if((len >= 2) && (data[0] == 0xe3) && (data[1] == 0x98))
return 1;
if((len >= 2) && (data[0] == 0xe3) && (data[1] == 0x99))
return 1;
if((len == 6) && (data[0] == 0xe3) && (data[1] == 0xa2))
return 1;
if((len >= 2) && (data[0] == 0xe3) && (data[1] == 0xa3))
return 1;
if((len == 27) && (data[0] == 0xe4) && (data[1] == 0x00))
return 1;
if((len == 529) && (data[0] == 0xe4) && (data[1] == 0x08))
return 1;
if((len == 18) && (data[0] == 0xe4) && (data[1] == 0x01) && (data[2] == 0x00) && (data[3] == 0x00))
return 1;
if((len == 523) && (data[0] == 0xe4) && (data[1] == 0x09))
return 1;
if((len == 35) && (data[0] == 0xe4) && (data[1] == 0x21))
return 1;
if((len == 19) && (data[0] == 0xe4) && (data[1] == 0x4b))
return 1;
if((len >= 2) && (data[0] == 0xe4) && (data[1] == 0x11))
return 1;
if((len == 22 || len == 38 || len == 28) && (data[0] == 0xe4) && (data[1] == 0x19))
return 1;
if((len == 35) && (data[0] == 0xe4) && (data[1] == 0x20))
return 1;
if((len == 27) && (data[0] == 0xe4) && (data[1] == 0x18))
return 1;
if((len == 27) && (data[0] == 0xe4) && (data[1] == 0x10))
return 1;
if((len == 6) && (data[0] == 0xe4) && (data[1] == 0x58))
return 1;
if((len == 4) && (data[0] == 0xe4) && (data[1] == 0x50))
return 1;
if((len == 36) && (data[0] == 0xe4) && (data[1] == 0x52))
return 1;
if((len == 48) && (data[0] == 0xe4) && (data[1] == 0x40))
return 1;
if((len == 225) && (data[0] == 0xe4) && (data[1] == 0x43))
return 1;
if((len == 19) && (data[0] == 0xe4) && (data[1] == 0x48))
return 1;
if((len == 119 || len == 69 || len == 294) && (data[0] == 0xe4) && (data[1] == 0x29))
return 1;
if((len == 119 || len == 69 || len == 294 || len == 44 || len == 269) && (data[0] == 0xe4) && (data[1] == 0x28))
return 1;
return 0;
}
static void ndpi_check_edonkey(struct ndpi_detection_module_struct *ndpi_struct, struct ndpi_flow_struct *flow) {
struct ndpi_packet_struct *packet = &ndpi_struct->packet;
u_int32_t payload_len = packet->payload_packet_len;
/* Break after 20 packets. */
if(flow->packet_counter > 20) {
NDPI_EXCLUDE_PROTO(ndpi_struct, flow);
return;
}
if(payload_len == 0) {
NDPI_EXCLUDE_PROTO(ndpi_struct, flow);
return;
}
/* Check if we so far detected the protocol in the request or not. */
if(flow->edonkey_stage == 0) {
NDPI_LOG_DBG2(ndpi_struct, "EDONKEY stage 0: \n");
if(ndpi_edonkey_payload_check(packet->payload, payload_len)) {
NDPI_LOG_DBG2(ndpi_struct, "Possible EDONKEY request detected, we will look further for the response\n");
/* Encode the direction of the packet in the stage, so we will know when we need to look for the response packet. */
flow->edonkey_stage = packet->packet_direction + 1;
} else
NDPI_EXCLUDE_PROTO(ndpi_struct, flow);
} else {
NDPI_LOG_DBG2(ndpi_struct, "EDONKEY stage %u: \n", flow->edonkey_stage);
/* At first check, if this is for sure a response packet (in another direction. If not, do nothing now and return. */
if((flow->edonkey_stage - packet->packet_direction) == 1) {
return;
}
/* This is a packet in another direction. Check if we find the proper response. */
if(ndpi_edonkey_payload_check(packet->payload, payload_len)) {
NDPI_LOG_INFO(ndpi_struct, "found EDONKEY\n");
ndpi_int_edonkey_add_connection(ndpi_struct, flow);
} else {
NDPI_LOG_DBG2(ndpi_struct, "The reply did not seem to belong to EDONKEY, resetting the stage to 0\n");
flow->edonkey_stage = 0;
}
}
if(flow->packet_counter > 5)
NDPI_EXCLUDE_PROTO(ndpi_struct, flow);
}
void ndpi_search_edonkey(struct ndpi_detection_module_struct *ndpi_struct, struct ndpi_flow_struct *flow) {
NDPI_LOG_DBG(ndpi_struct, "search EDONKEY\n");
/* skip marked packets */
if(flow->detected_protocol_stack[0] != NDPI_PROTOCOL_EDONKEY) {
ndpi_check_edonkey(ndpi_struct, flow);
}
}
void init_edonkey_dissector(struct ndpi_detection_module_struct *ndpi_struct, u_int32_t *id, NDPI_PROTOCOL_BITMASK *detection_bitmask)
{
ndpi_set_bitmask_protocol_detection("eDonkey", ndpi_struct, detection_bitmask, *id,
NDPI_PROTOCOL_EDONKEY,
ndpi_search_edonkey,
NDPI_SELECTION_BITMASK_PROTOCOL_V4_V6_TCP_OR_UDP_WITHOUT_RETRANSMISSION,
SAVE_DETECTION_BITMASK_AS_UNKNOWN,
ADD_TO_DETECTION_BITMASK);
*id += 1;
}