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/*
* ethereum.c
*
* Copyright (C) 2023 by 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_ETHEREUM
#include "ndpi_api.h"
#include "ndpi_private.h"
enum ether_disc_packet_type {
DISC_PING = 0x01,
DISC_PONG = 0x02,
DISC_FINDNODE = 0x03,
DISC_NEIGHBOURS = 0x04,
DISC_ENRREQUEST = 0x05,
DISC_ENRRESPONSE = 0x06
};
/* ************************************************************************** */
static void ndpi_ether_cache_connection(struct ndpi_detection_module_struct *ndpi_struct,
struct ndpi_flow_struct *flow) {
if(ndpi_struct->mining_cache)
ndpi_lru_add_to_cache(ndpi_struct->mining_cache, mining_make_lru_cache_key(flow), NDPI_PROTOCOL_ETHEREUM, ndpi_get_current_time(flow));
}
/* ************************************************************************** */
/*
* https://github.com/ethereum/devp2p/blob/master/discv4.md
*/
static bool ndpi_ether_is_discv4(const struct ndpi_packet_struct *packet) {
u_int16_t source = ntohs(packet->udp->source);
u_int16_t dest = ntohs(packet->udp->dest);
if((packet->payload_packet_len > 98)
&& (packet->payload_packet_len < 1280)
&& ((source == 30303) || (dest == 30303)) /*one way to remove default port is to compute packet hash and use it for verification*/
) {
uint8_t packet_type = packet->payload[97];
switch(packet_type) {
case DISC_PING:
case DISC_PONG:
case DISC_FINDNODE:
case DISC_NEIGHBOURS:
case DISC_ENRREQUEST:
case DISC_ENRRESPONSE:
return true;
default:
return false;
}
}
return false;
}
/* ************************************************************************** */
static void ndpi_search_ethereum_udp(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 ETHEREUM UDP\n");
if((packet->iph && ((ntohl(packet->iph->daddr) & 0xFF000000) != 0xFF000000 /* 255.0.0.0 */))
||(packet->iphv6 && (ntohl(packet->iphv6->ip6_dst.u6_addr.u6_addr32[0]) != 0xFF020000 /* ff02:: */))) {
if(ndpi_ether_is_discv4(packet) /*|| ndpi_is_discv5(packet)*/) {
ndpi_set_detected_protocol(ndpi_struct, flow, NDPI_PROTOCOL_ETHEREUM, NDPI_PROTOCOL_UNKNOWN, NDPI_CONFIDENCE_DPI);
ndpi_ether_cache_connection(ndpi_struct, flow);
return;
}
}
NDPI_EXCLUDE_PROTO(ndpi_struct, flow);
}
/* ************************************************************************** */
static u_int8_t ndpi_is_ether_port(u_int16_t dport) {
return(((dport >= 30300) && (dport <= 30305)) ? 1 : 0);
}
/* ************************************************************************** */
static void ndpi_search_ethereum_tcp(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 ETHEREUM TCP\n");
/* Check connection over TCP */
if(packet->payload_packet_len > 10) {
if((packet->payload_packet_len > 300)
&& (packet->payload_packet_len < 600)
&& (packet->payload[2] == 0x04)) {
if(ndpi_is_ether_port(ntohs(packet->tcp->dest)) /* Ethereum port */) {
ndpi_set_detected_protocol(ndpi_struct, flow, NDPI_PROTOCOL_ETHEREUM, NDPI_PROTOCOL_UNKNOWN, NDPI_CONFIDENCE_DPI);
ndpi_ether_cache_connection(ndpi_struct, flow);
return;
}
} else if(ndpi_strnstr((const char *)packet->payload, "{", packet->payload_packet_len)
&& (
ndpi_strnstr((const char *)packet->payload, "\"eth1.0\"", packet->payload_packet_len)
|| ndpi_strnstr((const char *)packet->payload, "\"worker\":", packet->payload_packet_len)
/* || ndpi_strnstr((const char *)packet->payload, "\"id\":", packet->payload_packet_len) - Removed as too generic */
)) {
/*
Ethereum
{"worker": "eth1.0", "jsonrpc": "2.0", "params": ["0x0fccfff9e61a230ff380530c6827caf4759337c6.rig2", "x"], "id": 2, "method": "eth_submitLogin"}
{ "id": 2, "jsonrpc":"2.0","result":true}
{"worker": "", "jsonrpc": "2.0", "params": [], "id": 3, "method": "eth_getWork"}
*/
ndpi_set_detected_protocol(ndpi_struct, flow, NDPI_PROTOCOL_ETHEREUM, NDPI_PROTOCOL_UNKNOWN, NDPI_CONFIDENCE_DPI);
ndpi_ether_cache_connection(ndpi_struct, flow);
return;
}
}
NDPI_EXCLUDE_PROTO(ndpi_struct, flow);
}
/* ************************************************************************** */
static void ndpi_search_ethereum(struct ndpi_detection_module_struct *ndpi_struct,
struct ndpi_flow_struct *flow) {
struct ndpi_packet_struct *packet = &ndpi_struct->packet;
if(packet->tcp)
return ndpi_search_ethereum_tcp(ndpi_struct, flow);
return ndpi_search_ethereum_udp(ndpi_struct, flow);
}
/* ************************************************************************** */
void init_ethereum_dissector(struct ndpi_detection_module_struct *ndpi_struct,
u_int32_t *id)
{
ndpi_set_bitmask_protocol_detection("Ethereum", ndpi_struct, *id,
NDPI_PROTOCOL_ETHEREUM,
ndpi_search_ethereum,
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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