145 lines
5.2 KiB
Rust
145 lines
5.2 KiB
Rust
// Copyright 2015-2019 Parity Technologies (UK) Ltd.
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// This file is part of Parity Ethereum.
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// Parity Ethereum is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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// Parity Ethereum is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// You should have received a copy of the GNU General Public License
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// along with Parity Ethereum. If not, see <http://www.gnu.org/licenses/>.
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//! Smart contract based node filter.
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extern crate ethabi;
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extern crate ethcore;
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extern crate ethcore_network as network;
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extern crate ethcore_network_devp2p as devp2p;
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extern crate ethereum_types;
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extern crate lru_cache;
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extern crate parking_lot;
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#[macro_use]
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extern crate ethabi_derive;
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#[macro_use]
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extern crate ethabi_contract;
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#[cfg(test)]
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extern crate ethcore_io as io;
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#[cfg(test)]
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extern crate kvdb_memorydb;
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#[cfg(test)]
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extern crate tempdir;
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#[macro_use]
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extern crate log;
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use std::sync::Weak;
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use devp2p::NodeId;
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use ethabi::FunctionOutputDecoder;
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use ethcore::client::{BlockChainClient, BlockId};
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use ethereum_types::{Address, H256};
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use network::{ConnectionDirection, ConnectionFilter};
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use_contract!(peer_set, "res/peer_set.json");
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/// Connection filter that uses a contract to manage permissions.
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pub struct NodeFilter {
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client: Weak<dyn BlockChainClient>,
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contract_address: Address,
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}
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impl NodeFilter {
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/// Create a new instance. Accepts a contract address.
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pub fn new(client: Weak<dyn BlockChainClient>, contract_address: Address) -> NodeFilter {
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NodeFilter {
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client,
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contract_address,
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}
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}
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}
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impl ConnectionFilter for NodeFilter {
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fn connection_allowed(
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&self,
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own_id: &NodeId,
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connecting_id: &NodeId,
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_direction: ConnectionDirection,
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) -> bool {
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let client = match self.client.upgrade() {
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Some(client) => client,
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None => return false,
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};
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let address = self.contract_address;
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let own_low = H256::from_slice(&own_id[0..32]);
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let own_high = H256::from_slice(&own_id[32..64]);
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let id_low = H256::from_slice(&connecting_id[0..32]);
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let id_high = H256::from_slice(&connecting_id[32..64]);
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let (data, decoder) =
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peer_set::functions::connection_allowed::call(own_low, own_high, id_low, id_high);
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let allowed = client
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.call_contract(BlockId::Latest, address, data)
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.and_then(|value| decoder.decode(&value).map_err(|e| e.to_string()))
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.unwrap_or_else(|e| {
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debug!("Error callling peer set contract: {:?}", e);
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false
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});
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allowed
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}
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}
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#[cfg(test)]
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mod test {
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use super::NodeFilter;
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use ethcore::{
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client::{BlockChainClient, Client, ClientConfig},
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miner::Miner,
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spec::Spec,
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test_helpers,
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};
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use io::IoChannel;
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use network::{ConnectionDirection, ConnectionFilter, NodeId};
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use std::sync::{Arc, Weak};
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use tempdir::TempDir;
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/// Contract code: https://gist.github.com/arkpar/467dbcc73cbb85b0997a7a10ffa0695f
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#[test]
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fn node_filter() {
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let contract_addr = "0000000000000000000000000000000000000005".into();
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let data = include_bytes!("../res/node_filter.json");
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let tempdir = TempDir::new("").unwrap();
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let spec = Spec::load(&tempdir.path(), &data[..]).unwrap();
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let client_db = test_helpers::new_db();
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let client = Client::new(
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ClientConfig::default(),
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&spec,
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client_db,
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Arc::new(Miner::new_for_tests(&spec, None)),
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IoChannel::disconnected(),
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)
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.unwrap();
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let filter = NodeFilter::new(
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Arc::downgrade(&client) as Weak<dyn BlockChainClient>,
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contract_addr,
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);
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let self1: NodeId = "00000000000000000000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000000000002".into();
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let self2: NodeId = "00000000000000000000000000000000000000000000000000000000000000020000000000000000000000000000000000000000000000000000000000000003".into();
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let node1: NodeId = "00000000000000000000000000000000000000000000000000000000000000110000000000000000000000000000000000000000000000000000000000000012".into();
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let node2: NodeId = "00000000000000000000000000000000000000000000000000000000000000210000000000000000000000000000000000000000000000000000000000000022".into();
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let nodex: NodeId = "77000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000".into();
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assert!(filter.connection_allowed(&self1, &node1, ConnectionDirection::Inbound));
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assert!(filter.connection_allowed(&self1, &nodex, ConnectionDirection::Inbound));
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assert!(filter.connection_allowed(&self2, &node1, ConnectionDirection::Inbound));
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assert!(filter.connection_allowed(&self2, &node2, ConnectionDirection::Inbound));
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}
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}
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