153 lines
5.2 KiB
Rust
153 lines
5.2 KiB
Rust
// Copyright 2015-2018 Parity Technologies (UK) Ltd.
|
|
// This file is part of Parity.
|
|
|
|
// Parity is free software: you can redistribute it and/or modify
|
|
// it under the terms of the GNU General Public License as published by
|
|
// the Free Software Foundation, either version 3 of the License, or
|
|
// (at your option) any later version.
|
|
|
|
// Parity 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 General Public License for more details.
|
|
|
|
// You should have received a copy of the GNU General Public License
|
|
// along with Parity. If not, see <http://www.gnu.org/licenses/>.
|
|
|
|
//! Smart contract based node filter.
|
|
|
|
extern crate ethabi;
|
|
extern crate ethcore;
|
|
extern crate ethcore_network as network;
|
|
extern crate ethcore_network_devp2p as devp2p;
|
|
extern crate ethereum_types;
|
|
extern crate lru_cache;
|
|
extern crate parking_lot;
|
|
|
|
#[macro_use]
|
|
extern crate ethabi_derive;
|
|
#[macro_use]
|
|
extern crate ethabi_contract;
|
|
#[cfg(test)]
|
|
extern crate ethcore_io as io;
|
|
#[cfg(test)]
|
|
extern crate kvdb_memorydb;
|
|
#[cfg(test)]
|
|
extern crate tempdir;
|
|
#[macro_use]
|
|
extern crate log;
|
|
|
|
use std::sync::Weak;
|
|
|
|
use lru_cache::LruCache;
|
|
use parking_lot::Mutex;
|
|
|
|
use ethcore::client::{BlockChainClient, BlockId};
|
|
use ethereum_types::{H256, Address};
|
|
use network::{ConnectionFilter, ConnectionDirection};
|
|
use devp2p::NodeId;
|
|
|
|
use_contract!(peer_set, "PeerSet", "res/peer_set.json");
|
|
|
|
const MAX_CACHE_SIZE: usize = 4096;
|
|
|
|
/// Connection filter that uses a contract to manage permissions.
|
|
pub struct NodeFilter {
|
|
contract: peer_set::PeerSet,
|
|
client: Weak<BlockChainClient>,
|
|
contract_address: Address,
|
|
permission_cache: Mutex<LruCache<(H256, NodeId), bool>>,
|
|
}
|
|
|
|
impl NodeFilter {
|
|
/// Create a new instance. Accepts a contract address.
|
|
pub fn new(client: Weak<BlockChainClient>, contract_address: Address) -> NodeFilter {
|
|
NodeFilter {
|
|
contract: peer_set::PeerSet::default(),
|
|
client,
|
|
contract_address,
|
|
permission_cache: Mutex::new(LruCache::new(MAX_CACHE_SIZE)),
|
|
}
|
|
}
|
|
}
|
|
|
|
impl ConnectionFilter for NodeFilter {
|
|
fn connection_allowed(&self, own_id: &NodeId, connecting_id: &NodeId, _direction: ConnectionDirection) -> bool {
|
|
let client = match self.client.upgrade() {
|
|
Some(client) => client,
|
|
None => return false,
|
|
};
|
|
|
|
let block_hash = match client.block_hash(BlockId::Latest) {
|
|
Some(block_hash) => block_hash,
|
|
None => return false,
|
|
};
|
|
|
|
let key = (block_hash, *connecting_id);
|
|
|
|
let mut cache = self.permission_cache.lock();
|
|
if let Some(res) = cache.get_mut(&key) {
|
|
return *res;
|
|
}
|
|
|
|
let address = self.contract_address;
|
|
let own_low = H256::from_slice(&own_id[0..32]);
|
|
let own_high = H256::from_slice(&own_id[32..64]);
|
|
let id_low = H256::from_slice(&connecting_id[0..32]);
|
|
let id_high = H256::from_slice(&connecting_id[32..64]);
|
|
|
|
let allowed = self.contract.functions()
|
|
.connection_allowed()
|
|
.call(own_low, own_high, id_low, id_high, &|data| client.call_contract(BlockId::Latest, address, data))
|
|
.unwrap_or_else(|e| {
|
|
debug!("Error callling peer set contract: {:?}", e);
|
|
false
|
|
});
|
|
|
|
cache.insert(key, allowed);
|
|
allowed
|
|
}
|
|
}
|
|
|
|
#[cfg(test)]
|
|
mod test {
|
|
use std::sync::{Arc, Weak};
|
|
use ethcore::spec::Spec;
|
|
use ethcore::client::{BlockChainClient, Client, ClientConfig};
|
|
use ethcore::miner::Miner;
|
|
use ethcore::test_helpers;
|
|
use network::{ConnectionDirection, ConnectionFilter, NodeId};
|
|
use io::IoChannel;
|
|
use super::NodeFilter;
|
|
use tempdir::TempDir;
|
|
|
|
/// Contract code: https://gist.github.com/arkpar/467dbcc73cbb85b0997a7a10ffa0695f
|
|
#[test]
|
|
fn node_filter() {
|
|
let contract_addr = "0000000000000000000000000000000000000005".into();
|
|
let data = include_bytes!("../res/node_filter.json");
|
|
let tempdir = TempDir::new("").unwrap();
|
|
let spec = Spec::load(&tempdir.path(), &data[..]).unwrap();
|
|
let client_db = test_helpers::new_db();
|
|
|
|
let client = Client::new(
|
|
ClientConfig::default(),
|
|
&spec,
|
|
client_db,
|
|
Arc::new(Miner::new_for_tests(&spec, None)),
|
|
IoChannel::disconnected(),
|
|
).unwrap();
|
|
let filter = NodeFilter::new(Arc::downgrade(&client) as Weak<BlockChainClient>, contract_addr);
|
|
let self1: NodeId = "00000000000000000000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000000000002".into();
|
|
let self2: NodeId = "00000000000000000000000000000000000000000000000000000000000000020000000000000000000000000000000000000000000000000000000000000003".into();
|
|
let node1: NodeId = "00000000000000000000000000000000000000000000000000000000000000110000000000000000000000000000000000000000000000000000000000000012".into();
|
|
let node2: NodeId = "00000000000000000000000000000000000000000000000000000000000000210000000000000000000000000000000000000000000000000000000000000022".into();
|
|
let nodex: NodeId = "77000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000".into();
|
|
|
|
assert!(filter.connection_allowed(&self1, &node1, ConnectionDirection::Inbound));
|
|
assert!(filter.connection_allowed(&self1, &nodex, ConnectionDirection::Inbound));
|
|
assert!(filter.connection_allowed(&self2, &node1, ConnectionDirection::Inbound));
|
|
assert!(filter.connection_allowed(&self2, &node2, ConnectionDirection::Inbound));
|
|
}
|
|
}
|