/* * edonkey.c * * Copyright (C) 2014 Tomasz Bujlow * * 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 . * */ #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); } 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 = &flow->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) 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_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; } } } void ndpi_search_edonkey(struct ndpi_detection_module_struct *ndpi_struct, struct ndpi_flow_struct *flow) { struct ndpi_packet_struct *packet = &flow->packet; NDPI_LOG_DBG(ndpi_struct, "search EDONKEY\n"); /* skip marked packets */ if(packet->detected_protocol_stack[0] != NDPI_PROTOCOL_EDONKEY) { if(packet->tcp_retransmission == 0) { 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; }