diff options
Diffstat (limited to 'src/lib/protocols/ethereum.c')
| -rw-r--r-- | src/lib/protocols/ethereum.c | 155 |
1 files changed, 155 insertions, 0 deletions
diff --git a/src/lib/protocols/ethereum.c b/src/lib/protocols/ethereum.c new file mode 100644 index 000000000..db7c0cb88 --- /dev/null +++ b/src/lib/protocols/ethereum.c @@ -0,0 +1,155 @@ +/* + * 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" + + +/* ************************************************************************** */ + +static u_int32_t ndpi_ether_make_lru_cache_key(struct ndpi_flow_struct *flow) { + u_int32_t key; + + /* network byte order */ + if(flow->is_ipv6) + key = ndpi_quick_hash(flow->c_address.v6, 16) + ndpi_quick_hash(flow->s_address.v6, 16); + else + key = flow->c_address.v4 + flow->s_address.v4; + + return key; +} + +/* ************************************************************************** */ + +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, ndpi_ether_make_lru_cache_key(flow), NDPI_PROTOCOL_ETHEREUM, ndpi_get_current_time(flow)); +} + +/* ************************************************************************** */ + +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; + u_int16_t source = ntohs(packet->udp->source); + u_int16_t dest = ntohs(packet->udp->dest); + + NDPI_LOG_DBG(ndpi_struct, "search ETHEREUM UDP\n"); + + /* + Ethereum P2P Discovery Protocol + https://github.com/ConsenSys/ethereum-dissectors/blob/master/packet-ethereum-disc.c + */ + if((packet->payload_packet_len > 98) + && (packet->payload_packet_len < 1280) + && ((source == 30303) || (dest == 30303)) + && (packet->payload[97] <= 0x04 /* NODES */) + ) { + if((packet->iph) && ((ntohl(packet->iph->daddr) & 0xFF000000 /* 255.0.0.0 */) == 0xFF000000)) + ; + else if(packet->iphv6 && ntohl(packet->iphv6->ip6_dst.u6_addr.u6_addr32[0]) == 0xFF020000) + ; + else { + 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; +} + |