// Copyright 2015, 2016 Ethcore (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 . use std::net::{SocketAddr}; use std::collections::{HashMap}; use std::hash::{Hasher}; use std::str::{FromStr}; use std::sync::*; use std::ops::*; use std::cmp::min; use std::path::{Path, PathBuf}; use std::io::{Read, Write}; use std::default::Default; use std::fs; use mio::*; use mio::tcp::*; use hash::*; use misc::version; use crypto::*; use sha3::Hashable; use rlp::*; use network::handshake::Handshake; use network::session::{Session, SessionData}; use error::*; use io::*; use network::{NetworkProtocolHandler, PROTOCOL_VERSION}; use network::node_table::*; use network::stats::NetworkStats; use network::error::DisconnectReason; use network::discovery::{Discovery, TableUpdates, NodeEntry}; use network::ip_utils::{map_external_address, select_public_address}; type Slab = ::slab::Slab; const _DEFAULT_PORT: u16 = 30304; const MAX_SESSIONS: usize = 1024; const MAX_HANDSHAKES: usize = 80; const MAX_HANDSHAKES_PER_ROUND: usize = 32; const MAINTENANCE_TIMEOUT: u64 = 1000; #[derive(Debug)] /// Network service configuration pub struct NetworkConfiguration { /// Directory path to store network configuration. None means nothing will be saved pub config_path: Option, /// IP address to listen for incoming connections. Listen to all connections by default pub listen_address: Option, /// IP address to advertise. Detected automatically if none. pub public_address: Option, /// Port for UDP connections, same as TCP by default pub udp_port: Option, /// Enable NAT configuration pub nat_enabled: bool, /// Enable discovery pub discovery_enabled: bool, /// Pin to boot nodes only pub pin: bool, /// List of initial node addresses pub boot_nodes: Vec, /// Use provided node key instead of default pub use_secret: Option, /// Number of connected peers to maintain pub ideal_peers: u32, } impl Default for NetworkConfiguration { fn default() -> Self { NetworkConfiguration::new() } } impl NetworkConfiguration { /// Create a new instance of default settings. pub fn new() -> Self { NetworkConfiguration { config_path: None, listen_address: None, public_address: None, udp_port: None, nat_enabled: true, discovery_enabled: true, pin: false, boot_nodes: Vec::new(), use_secret: None, ideal_peers: 25, } } /// Create new default configuration with sepcified listen port. pub fn new_with_port(port: u16) -> NetworkConfiguration { let mut config = NetworkConfiguration::new(); config.listen_address = Some(SocketAddr::from_str(&format!("0.0.0.0:{}", port)).unwrap()); config } /// Create new default configuration for localhost-only connection with random port (usefull for testing) pub fn new_local() -> NetworkConfiguration { let mut config = NetworkConfiguration::new(); config.listen_address = Some(SocketAddr::from_str("127.0.0.1:0").unwrap()); config.nat_enabled = false; config } } // Tokens const TCP_ACCEPT: usize = LAST_HANDSHAKE + 1; const IDLE: usize = LAST_HANDSHAKE + 2; const DISCOVERY: usize = LAST_HANDSHAKE + 3; const DISCOVERY_REFRESH: usize = LAST_HANDSHAKE + 4; const DISCOVERY_ROUND: usize = LAST_HANDSHAKE + 5; const INIT_PUBLIC: usize = LAST_HANDSHAKE + 6; const FIRST_SESSION: usize = 0; const LAST_SESSION: usize = FIRST_SESSION + MAX_SESSIONS - 1; const FIRST_HANDSHAKE: usize = LAST_SESSION + 1; const LAST_HANDSHAKE: usize = FIRST_HANDSHAKE + MAX_HANDSHAKES - 1; const USER_TIMER: usize = LAST_HANDSHAKE + 256; /// Protocol handler level packet id pub type PacketId = u8; /// Protocol / handler id pub type ProtocolId = &'static str; /// Messages used to communitate with the event loop from other threads. #[derive(Clone)] pub enum NetworkIoMessage where Message: Send + Sync + Clone { /// Register a new protocol handler. AddHandler { /// Handler shared instance. handler: Arc + Sync>, /// Protocol Id. protocol: ProtocolId, /// Supported protocol versions. versions: Vec, }, /// Register a new protocol timer AddTimer { /// Protocol Id. protocol: ProtocolId, /// Timer token. token: TimerToken, /// Timer delay in milliseconds. delay: u64, }, /// Disconnect a peer Disconnect(PeerId), /// User message User(Message), } /// Local (temporary) peer session ID. pub type PeerId = usize; #[derive(Debug, PartialEq, Eq)] /// Protocol info pub struct CapabilityInfo { pub protocol: ProtocolId, pub version: u8, /// Total number of packet IDs this protocol support. pub packet_count: u8, } impl Encodable for CapabilityInfo { fn rlp_append(&self, s: &mut RlpStream) { s.begin_list(2); s.append(&self.protocol); s.append(&self.version); } } /// IO access point. This is passed to all IO handlers and provides an interface to the IO subsystem. pub struct NetworkContext<'s, Message> where Message: Send + Sync + Clone + 'static, 's { io: &'s IoContext>, protocol: ProtocolId, sessions: Arc>>, session: Option, session_id: Option, } impl<'s, Message> NetworkContext<'s, Message> where Message: Send + Sync + Clone + 'static, { /// Create a new network IO access point. Takes references to all the data that can be updated within the IO handler. fn new(io: &'s IoContext>, protocol: ProtocolId, session: Option, sessions: Arc>>) -> NetworkContext<'s, Message> { let id = session.as_ref().map(|s| s.lock().unwrap().token()); NetworkContext { io: io, protocol: protocol, session_id: id, session: session, sessions: sessions, } } fn resolve_session(&self, peer: PeerId) -> Option { match self.session_id { Some(id) if id == peer => self.session.clone(), _ => self.sessions.read().unwrap().get(peer).cloned(), } } /// Send a packet over the network to another peer. pub fn send(&self, peer: PeerId, packet_id: PacketId, data: Vec) -> Result<(), UtilError> { let session = self.resolve_session(peer); if let Some(session) = session { try!(session.lock().unwrap().deref_mut().send_packet(self.protocol, packet_id as u8, &data)); try!(self.io.update_registration(peer)); } else { trace!(target: "network", "Send: Peer no longer exist") } Ok(()) } /// Respond to a current network message. Panics if no there is no packet in the context. If the session is expired returns nothing. pub fn respond(&self, packet_id: PacketId, data: Vec) -> Result<(), UtilError> { assert!(self.session.is_some(), "Respond called without network context"); self.send(self.session_id.unwrap(), packet_id, data) } /// Send an IO message pub fn message(&self, msg: Message) { self.io.message(NetworkIoMessage::User(msg)); } /// Disable current protocol capability for given peer. If no capabilities left peer gets disconnected. pub fn disable_peer(&self, peer: PeerId) { //TODO: remove capability, disconnect if no capabilities left self.disconnect_peer(peer); } /// Disconnect peer. Reconnect can be attempted later. pub fn disconnect_peer(&self, peer: PeerId) { self.io.message(NetworkIoMessage::Disconnect(peer)); } /// Register a new IO timer. 'IoHandler::timeout' will be called with the token. pub fn register_timer(&self, token: TimerToken, ms: u64) -> Result<(), UtilError> { self.io.message(NetworkIoMessage::AddTimer { token: token, delay: ms, protocol: self.protocol, }); Ok(()) } /// Returns peer identification string pub fn peer_info(&self, peer: PeerId) -> String { let session = self.resolve_session(peer); if let Some(session) = session { return session.lock().unwrap().info.client_version.clone() } "unknown".to_owned() } } /// Shared host information pub struct HostInfo { /// Our private and public keys. keys: KeyPair, /// Current network configuration config: NetworkConfiguration, /// Connection nonce. nonce: H256, /// RLPx protocol version pub protocol_version: u32, /// Client identifier pub client_version: String, /// Registered capabilities (handlers) pub capabilities: Vec, /// Local address + discovery port pub local_endpoint: NodeEndpoint, /// Public address + discovery port pub public_endpoint: Option, } impl HostInfo { /// Returns public key pub fn id(&self) -> &NodeId { self.keys.public() } /// Returns secret key pub fn secret(&self) -> &Secret { self.keys.secret() } /// Increments and returns connection nonce. pub fn next_nonce(&mut self) -> H256 { self.nonce = self.nonce.sha3(); self.nonce.clone() } } type SharedSession = Arc>; type SharedHandshake = Arc>; #[derive(Copy, Clone)] struct ProtocolTimer { pub protocol: ProtocolId, pub token: TimerToken, // Handler level token } /// Root IO handler. Manages protocol handlers, IO timers and network connections. pub struct Host where Message: Send + Sync + Clone { pub info: RwLock, tcp_listener: Mutex, handshakes: Arc>>, sessions: Arc>>, discovery: Mutex>, nodes: RwLock, handlers: RwLock>>>, timers: RwLock>, timer_counter: RwLock, stats: Arc, pinned_nodes: Vec, } impl Host where Message: Send + Sync + Clone { /// Create a new instance pub fn new(config: NetworkConfiguration) -> Result, UtilError> { let mut listen_address = match config.listen_address { None => SocketAddr::from_str("0.0.0.0:30304").unwrap(), Some(addr) => addr, }; let keys = if let Some(ref secret) = config.use_secret { KeyPair::from_secret(secret.clone()).unwrap() } else { config.config_path.clone().and_then(|ref p| load_key(&Path::new(&p))) .map_or_else(|| { let key = KeyPair::create().unwrap(); if let Some(path) = config.config_path.clone() { save_key(&Path::new(&path), &key.secret()); } key }, |s| KeyPair::from_secret(s).expect("Error creating node secret key")) }; let path = config.config_path.clone(); // Setup the server socket let tcp_listener = try!(TcpListener::bind(&listen_address)); listen_address = SocketAddr::new(listen_address.ip(), try!(tcp_listener.local_addr()).port()); let udp_port = config.udp_port.unwrap_or(listen_address.port()); let local_endpoint = NodeEndpoint { address: listen_address, udp_port: udp_port }; let mut host = Host:: { info: RwLock::new(HostInfo { keys: keys, config: config, nonce: H256::random(), protocol_version: PROTOCOL_VERSION, client_version: version(), capabilities: Vec::new(), public_endpoint: None, local_endpoint: local_endpoint, }), discovery: Mutex::new(None), tcp_listener: Mutex::new(tcp_listener), handshakes: Arc::new(RwLock::new(Slab::new_starting_at(FIRST_HANDSHAKE, MAX_HANDSHAKES))), sessions: Arc::new(RwLock::new(Slab::new_starting_at(FIRST_SESSION, MAX_SESSIONS))), nodes: RwLock::new(NodeTable::new(path)), handlers: RwLock::new(HashMap::new()), timers: RwLock::new(HashMap::new()), timer_counter: RwLock::new(USER_TIMER), stats: Arc::new(NetworkStats::default()), pinned_nodes: Vec::new(), }; let boot_nodes = host.info.read().unwrap().config.boot_nodes.clone(); for n in boot_nodes { host.add_node(&n); } Ok(host) } pub fn stats(&self) -> Arc { self.stats.clone() } pub fn add_node(&mut self, id: &str) { match Node::from_str(id) { Err(e) => { debug!("Could not add node {}: {:?}", id, e); }, Ok(n) => { let entry = NodeEntry { endpoint: n.endpoint.clone(), id: n.id.clone() }; self.pinned_nodes.push(n.id.clone()); self.nodes.write().unwrap().add_node(n); if let Some(ref mut discovery) = *self.discovery.lock().unwrap().deref_mut() { discovery.add_node(entry); } } } } pub fn client_version(&self) -> String { self.info.read().unwrap().client_version.clone() } pub fn external_url(&self) -> Option { self.info.read().unwrap().public_endpoint.as_ref().map(|e| format!("{}", Node::new(self.info.read().unwrap().id().clone(), e.clone()))) } pub fn local_url(&self) -> String { let r = format!("{}", Node::new(self.info.read().unwrap().id().clone(), self.info.read().unwrap().local_endpoint.clone())); println!("{}", r); r } fn init_public_interface(&self, io: &IoContext>) -> Result<(), UtilError> { io.clear_timer(INIT_PUBLIC).unwrap(); if self.info.read().unwrap().public_endpoint.is_some() { return Ok(()); } let local_endpoint = self.info.read().unwrap().local_endpoint.clone(); let public_address = self.info.read().unwrap().config.public_address.clone(); let public_endpoint = match public_address { None => { let public_address = select_public_address(local_endpoint.address.port()); let public_endpoint = NodeEndpoint { address: public_address, udp_port: local_endpoint.udp_port }; if self.info.read().unwrap().config.nat_enabled { match map_external_address(&local_endpoint) { Some(endpoint) => { info!("NAT mapped to external address {}", endpoint.address); endpoint }, None => public_endpoint } } else { public_endpoint } } Some(addr) => NodeEndpoint { address: addr, udp_port: local_endpoint.udp_port } }; self.info.write().unwrap().public_endpoint = Some(public_endpoint.clone()); info!("Public node URL: {}", self.external_url().unwrap()); // Initialize discovery. let discovery = { let info = self.info.read().unwrap(); if info.config.discovery_enabled && !info.config.pin { Some(Discovery::new(&info.keys, public_endpoint.address.clone(), public_endpoint, DISCOVERY)) } else { None } }; if let Some(mut discovery) = discovery { discovery.init_node_list(self.nodes.read().unwrap().unordered_entries()); for n in self.nodes.read().unwrap().unordered_entries() { discovery.add_node(n.clone()); } *self.discovery.lock().unwrap().deref_mut() = Some(discovery); io.register_stream(DISCOVERY).expect("Error registering UDP listener"); io.register_timer(DISCOVERY_REFRESH, 7200).expect("Error registering discovery timer"); io.register_timer(DISCOVERY_ROUND, 300).expect("Error registering discovery timer"); } try!(io.register_stream(TCP_ACCEPT)); Ok(()) } fn maintain_network(&self, io: &IoContext>) { self.keep_alive(io); self.connect_peers(io); } fn have_session(&self, id: &NodeId) -> bool { self.sessions.read().unwrap().iter().any(|e| e.lock().unwrap().info.id.eq(&id)) } fn session_count(&self) -> usize { self.sessions.read().unwrap().count() } fn connecting_to(&self, id: &NodeId) -> bool { self.handshakes.read().unwrap().iter().any(|e| e.lock().unwrap().id.eq(&id)) } fn handshake_count(&self) -> usize { self.handshakes.read().unwrap().count() } fn keep_alive(&self, io: &IoContext>) { let mut to_kill = Vec::new(); for e in self.sessions.write().unwrap().iter_mut() { let mut s = e.lock().unwrap(); if !s.keep_alive(io) { s.disconnect(DisconnectReason::PingTimeout); to_kill.push(s.token()); } } for p in to_kill { self.kill_connection(p, io, true); } } fn connect_peers(&self, io: &IoContext>) { let ideal_peers = { self.info.read().unwrap().deref().config.ideal_peers }; let pin = { self.info.read().unwrap().deref().config.pin }; let session_count = self.session_count(); if session_count >= ideal_peers as usize { return; } let handshake_count = self.handshake_count(); // allow 16 slots for incoming connections let handshake_limit = MAX_HANDSHAKES - 16; if handshake_count >= handshake_limit { return; } let nodes = if pin { self.pinned_nodes.clone() } else { self.nodes.read().unwrap().nodes() }; for id in nodes.iter().filter(|ref id| !self.have_session(id) && !self.connecting_to(id)) .take(min(MAX_HANDSHAKES_PER_ROUND, handshake_limit - handshake_count)) { self.connect_peer(&id, io); } debug!(target: "network", "Connecting peers: {} sessions, {} pending", self.session_count(), self.handshake_count()); } #[cfg_attr(feature="dev", allow(single_match))] fn connect_peer(&self, id: &NodeId, io: &IoContext>) { if self.have_session(id) { trace!(target: "network", "Aborted connect. Node already connected."); return; } if self.connecting_to(id) { trace!(target: "network", "Aborted connect. Node already connecting."); return; } let socket = { let address = { let mut nodes = self.nodes.write().unwrap(); if let Some(node) = nodes.get_mut(id) { node.last_attempted = Some(::time::now()); node.endpoint.address } else { debug!(target: "network", "Connection to expired node aborted"); return; } }; match TcpStream::connect(&address) { Ok(socket) => socket, Err(e) => { debug!("Can't connect to address {:?}: {:?}", address, e); return; } } }; self.create_connection(socket, Some(id), io); } #[cfg_attr(feature="dev", allow(block_in_if_condition_stmt))] fn create_connection(&self, socket: TcpStream, id: Option<&NodeId>, io: &IoContext>) { let nonce = self.info.write().unwrap().next_nonce(); let mut handshakes = self.handshakes.write().unwrap(); if handshakes.insert_with(|token| { let mut handshake = Handshake::new(token, id, socket, &nonce, self.stats.clone()).expect("Can't create handshake"); handshake.start(io, &self.info.read().unwrap(), id.is_some()).and_then(|_| io.register_stream(token)).unwrap_or_else (|e| { debug!(target: "network", "Handshake create error: {:?}", e); }); Arc::new(Mutex::new(handshake)) }).is_none() { debug!(target: "network", "Max handshakes reached"); } } fn accept(&self, io: &IoContext>) { trace!(target: "network", "Accepting incoming connection"); loop { let socket = match self.tcp_listener.lock().unwrap().accept() { Ok(None) => break, Ok(Some((sock, _addr))) => sock, Err(e) => { warn!("Error accepting connection: {:?}", e); break }, }; self.create_connection(socket, None, io); } io.update_registration(TCP_ACCEPT).expect("Error registering TCP listener"); } fn handshake_writable(&self, token: StreamToken, io: &IoContext>) { let handshake = { self.handshakes.read().unwrap().get(token).cloned() }; if let Some(handshake) = handshake { let mut h = handshake.lock().unwrap(); if let Err(e) = h.writable(io, &self.info.read().unwrap()) { trace!(target: "network", "Handshake write error: {}: {:?}", token, e); } } } fn session_writable(&self, token: StreamToken, io: &IoContext>) { let session = { self.sessions.read().unwrap().get(token).cloned() }; if let Some(session) = session { let mut s = session.lock().unwrap(); if let Err(e) = s.writable(io, &self.info.read().unwrap()) { trace!(target: "network", "Session write error: {}: {:?}", token, e); } io.update_registration(token).unwrap_or_else(|e| debug!(target: "network", "Session registration error: {:?}", e)); } } fn connection_closed(&self, token: TimerToken, io: &IoContext>) { self.kill_connection(token, io, true); } fn handshake_readable(&self, token: StreamToken, io: &IoContext>) { let mut create_session = false; let mut kill = false; let handshake = { self.handshakes.read().unwrap().get(token).cloned() }; if let Some(handshake) = handshake { let mut h = handshake.lock().unwrap(); if let Err(e) = h.readable(io, &self.info.read().unwrap()) { debug!(target: "network", "Handshake read error: {}: {:?}", token, e); kill = true; } if h.done() { create_session = true; } } if kill { self.kill_connection(token, io, true); return; } else if create_session { self.start_session(token, io); return; } io.update_registration(token).unwrap_or_else(|e| debug!(target: "network", "Token registration error: {:?}", e)); } fn session_readable(&self, token: StreamToken, io: &IoContext>) { let mut ready_data: Vec = Vec::new(); let mut packet_data: Option<(ProtocolId, PacketId, Vec)> = None; let mut kill = false; let session = { self.sessions.read().unwrap().get(token).cloned() }; if let Some(session) = session.clone() { let mut s = session.lock().unwrap(); match s.readable(io, &self.info.read().unwrap()) { Err(e) => { debug!(target: "network", "Session read error: {}: {:?}", token, e); kill = true; }, Ok(SessionData::Ready) => { for (p, _) in self.handlers.read().unwrap().iter() { if s.have_capability(p) { ready_data.push(p); } } }, Ok(SessionData::Packet { data, protocol, packet_id, }) => { match self.handlers.read().unwrap().get(protocol) { None => { warn!(target: "network", "No handler found for protocol: {:?}", protocol) }, Some(_) => packet_data = Some((protocol, packet_id, data)), } }, Ok(SessionData::None) => {}, } } if kill { self.kill_connection(token, io, true); } for p in ready_data { let h = self.handlers.read().unwrap().get(p).unwrap().clone(); h.connected(&NetworkContext::new(io, p, session.clone(), self.sessions.clone()), &token); } if let Some((p, packet_id, data)) = packet_data { let h = self.handlers.read().unwrap().get(p).unwrap().clone(); h.read(&NetworkContext::new(io, p, session.clone(), self.sessions.clone()), &token, packet_id, &data[1..]); } io.update_registration(token).unwrap_or_else(|e| debug!(target: "network", "Token registration error: {:?}", e)); } fn start_session(&self, token: StreamToken, io: &IoContext>) { let mut handshakes = self.handshakes.write().unwrap(); if handshakes.get(token).is_none() { return; } // turn a handshake into a session let mut sessions = self.sessions.write().unwrap(); let mut h = handshakes.get_mut(token).unwrap().lock().unwrap(); if h.expired { return; } io.deregister_stream(token).expect("Error deleting handshake registration"); h.set_expired(); let originated = h.originated; let mut session = match Session::new(&mut h, &self.info.read().unwrap()) { Ok(s) => s, Err(e) => { debug!(target: "network", "Session creation error: {:?}", e); return; } }; if !originated { let session_count = sessions.count(); let ideal_peers = { self.info.read().unwrap().deref().config.ideal_peers }; if session_count >= ideal_peers as usize { session.disconnect(DisconnectReason::TooManyPeers); return; } } let result = sessions.insert_with(move |session_token| { session.set_token(session_token); io.register_stream(session_token).expect("Error creating session registration"); self.stats.inc_sessions(); trace!(target: "network", "Creating session {} -> {}", token, session_token); if !originated { // Add it no node table if let Ok(address) = session.remote_addr() { let entry = NodeEntry { id: session.id().clone(), endpoint: NodeEndpoint { address: address, udp_port: address.port() } }; self.nodes.write().unwrap().add_node(Node::new(entry.id.clone(), entry.endpoint.clone())); let mut discovery = self.discovery.lock().unwrap(); if let Some(ref mut discovery) = *discovery.deref_mut() { discovery.add_node(entry); } } } Arc::new(Mutex::new(session)) }); if result.is_none() { warn!("Max sessions reached"); } } fn connection_timeout(&self, token: StreamToken, io: &IoContext>) { self.kill_connection(token, io, true) } fn kill_connection(&self, token: StreamToken, io: &IoContext>, remote: bool) { let mut to_disconnect: Vec = Vec::new(); let mut failure_id = None; let mut deregister = false; let mut expired_session = None; match token { FIRST_HANDSHAKE ... LAST_HANDSHAKE => { let handshakes = self.handshakes.write().unwrap(); if let Some(handshake) = handshakes.get(token).cloned() { let mut handshake = handshake.lock().unwrap(); if !handshake.expired() { handshake.set_expired(); failure_id = Some(handshake.id().clone()); deregister = true; } } }, FIRST_SESSION ... LAST_SESSION => { let sessions = self.sessions.write().unwrap(); if let Some(session) = sessions.get(token).cloned() { expired_session = Some(session.clone()); let mut s = session.lock().unwrap(); if !s.expired() { if s.is_ready() { for (p, _) in self.handlers.read().unwrap().iter() { if s.have_capability(p) { to_disconnect.push(p); } } } s.set_expired(); failure_id = Some(s.id().clone()); deregister = true; } } }, _ => {}, } if let Some(id) = failure_id { if remote { self.nodes.write().unwrap().note_failure(&id); } } for p in to_disconnect { let h = self.handlers.read().unwrap().get(p).unwrap().clone(); h.disconnected(&NetworkContext::new(io, p, expired_session.clone(), self.sessions.clone()), &token); } if deregister { io.deregister_stream(token).expect("Error deregistering stream"); } } fn update_nodes(&self, io: &IoContext>, node_changes: TableUpdates) { let mut to_remove: Vec = Vec::new(); { { let handshakes = self.handshakes.write().unwrap(); for c in handshakes.iter() { let h = c.lock().unwrap(); if node_changes.removed.contains(&h.id()) { to_remove.push(h.token()); } } } { let sessions = self.sessions.write().unwrap(); for c in sessions.iter() { let s = c.lock().unwrap(); if node_changes.removed.contains(&s.id()) { to_remove.push(s.token()); } } } } for i in to_remove { self.kill_connection(i, io, false); } self.nodes.write().unwrap().update(node_changes); } } impl IoHandler> for Host where Message: Send + Sync + Clone + 'static { /// Initialize networking fn initialize(&self, io: &IoContext>) { io.register_timer(IDLE, MAINTENANCE_TIMEOUT).expect("Error registering Network idle timer"); io.register_timer(INIT_PUBLIC, 0).expect("Error registering initialization timer"); self.maintain_network(io) } fn stream_hup(&self, io: &IoContext>, stream: StreamToken) { trace!(target: "network", "Hup: {}", stream); match stream { FIRST_SESSION ... LAST_SESSION => self.connection_closed(stream, io), FIRST_HANDSHAKE ... LAST_HANDSHAKE => self.connection_closed(stream, io), _ => warn!(target: "network", "Unexpected hup"), }; } fn stream_readable(&self, io: &IoContext>, stream: StreamToken) { match stream { FIRST_SESSION ... LAST_SESSION => self.session_readable(stream, io), FIRST_HANDSHAKE ... LAST_HANDSHAKE => self.handshake_readable(stream, io), DISCOVERY => { let node_changes = { self.discovery.lock().unwrap().as_mut().unwrap().readable() }; if let Some(node_changes) = node_changes { self.update_nodes(io, node_changes); } io.update_registration(DISCOVERY).expect("Error updating discovery registration"); }, TCP_ACCEPT => self.accept(io), _ => panic!("Received unknown readable token"), } } fn stream_writable(&self, io: &IoContext>, stream: StreamToken) { match stream { FIRST_SESSION ... LAST_SESSION => self.session_writable(stream, io), FIRST_HANDSHAKE ... LAST_HANDSHAKE => self.handshake_writable(stream, io), DISCOVERY => { self.discovery.lock().unwrap().as_mut().unwrap().writable(); io.update_registration(DISCOVERY).expect("Error updating discovery registration"); } _ => panic!("Received unknown writable token"), } } fn timeout(&self, io: &IoContext>, token: TimerToken) { match token { IDLE => self.maintain_network(io), INIT_PUBLIC => self.init_public_interface(io).unwrap_or_else(|e| warn!("Error initializing public interface: {:?}", e)), FIRST_SESSION ... LAST_SESSION => self.connection_timeout(token, io), FIRST_HANDSHAKE ... LAST_HANDSHAKE => self.connection_timeout(token, io), DISCOVERY_REFRESH => { self.discovery.lock().unwrap().as_mut().unwrap().refresh(); io.update_registration(DISCOVERY).expect("Error updating discovery registration"); }, DISCOVERY_ROUND => { let node_changes = { self.discovery.lock().unwrap().as_mut().unwrap().round() }; if let Some(node_changes) = node_changes { self.update_nodes(io, node_changes); } io.update_registration(DISCOVERY).expect("Error updating discovery registration"); }, _ => match self.timers.read().unwrap().get(&token).cloned() { Some(timer) => match self.handlers.read().unwrap().get(timer.protocol).cloned() { None => { warn!(target: "network", "No handler found for protocol: {:?}", timer.protocol) }, Some(h) => { h.timeout(&NetworkContext::new(io, timer.protocol, None, self.sessions.clone()), timer.token); } }, None => { warn!("Unknown timer token: {}", token); } // timer is not registerd through us } } } fn message(&self, io: &IoContext>, message: &NetworkIoMessage) { match *message { NetworkIoMessage::AddHandler { ref handler, ref protocol, ref versions } => { let h = handler.clone(); h.initialize(&NetworkContext::new(io, protocol, None, self.sessions.clone())); self.handlers.write().unwrap().insert(protocol, h); let mut info = self.info.write().unwrap(); for v in versions { info.capabilities.push(CapabilityInfo { protocol: protocol, version: *v, packet_count:0 }); } }, NetworkIoMessage::AddTimer { ref protocol, ref delay, ref token, } => { let handler_token = { let mut timer_counter = self.timer_counter.write().unwrap(); let counter = timer_counter.deref_mut(); let handler_token = *counter; *counter += 1; handler_token }; self.timers.write().unwrap().insert(handler_token, ProtocolTimer { protocol: protocol, token: *token }); io.register_timer(handler_token, *delay).expect("Error registering timer"); }, NetworkIoMessage::Disconnect(ref peer) => { let session = { self.sessions.read().unwrap().get(*peer).cloned() }; if let Some(session) = session { session.lock().unwrap().disconnect(DisconnectReason::DisconnectRequested); } self.kill_connection(*peer, io, false); }, NetworkIoMessage::User(ref message) => { for (p, h) in self.handlers.read().unwrap().iter() { h.message(&NetworkContext::new(io, p, None, self.sessions.clone()), &message); } } } } fn register_stream(&self, stream: StreamToken, reg: Token, event_loop: &mut EventLoop>>) { match stream { FIRST_SESSION ... LAST_SESSION => { let session = { self.sessions.read().unwrap().get(stream).cloned() }; if let Some(session) = session { session.lock().unwrap().register_socket(reg, event_loop).expect("Error registering socket"); } } FIRST_HANDSHAKE ... LAST_HANDSHAKE => { let connection = { self.handshakes.read().unwrap().get(stream).cloned() }; if let Some(connection) = connection { connection.lock().unwrap().register_socket(reg, event_loop).expect("Error registering socket"); } } DISCOVERY => self.discovery.lock().unwrap().as_ref().unwrap().register_socket(event_loop).expect("Error registering discovery socket"), TCP_ACCEPT => event_loop.register(self.tcp_listener.lock().unwrap().deref(), Token(TCP_ACCEPT), EventSet::all(), PollOpt::edge()).expect("Error registering stream"), _ => warn!("Unexpected stream registration") } } fn deregister_stream(&self, stream: StreamToken, event_loop: &mut EventLoop>>) { match stream { FIRST_SESSION ... LAST_SESSION => { let mut connections = self.sessions.write().unwrap(); if let Some(connection) = connections.get(stream).cloned() { connection.lock().unwrap().deregister_socket(event_loop).expect("Error deregistering socket"); connections.remove(stream); } } FIRST_HANDSHAKE ... LAST_HANDSHAKE => { let mut connections = self.handshakes.write().unwrap(); if let Some(connection) = connections.get(stream).cloned() { connection.lock().unwrap().deregister_socket(event_loop).expect("Error deregistering socket"); connections.remove(stream); } } DISCOVERY => (), _ => warn!("Unexpected stream deregistration") } } fn update_stream(&self, stream: StreamToken, reg: Token, event_loop: &mut EventLoop>>) { match stream { FIRST_SESSION ... LAST_SESSION => { let connection = { self.sessions.read().unwrap().get(stream).cloned() }; if let Some(connection) = connection { connection.lock().unwrap().update_socket(reg, event_loop).expect("Error updating socket"); } } FIRST_HANDSHAKE ... LAST_HANDSHAKE => { let connection = { self.handshakes.read().unwrap().get(stream).cloned() }; if let Some(connection) = connection { connection.lock().unwrap().update_socket(reg, event_loop).expect("Error updating socket"); } } DISCOVERY => self.discovery.lock().unwrap().as_ref().unwrap().update_registration(event_loop).expect("Error reregistering discovery socket"), TCP_ACCEPT => event_loop.reregister(self.tcp_listener.lock().unwrap().deref(), Token(TCP_ACCEPT), EventSet::all(), PollOpt::edge()).expect("Error reregistering stream"), _ => warn!("Unexpected stream update") } } } fn save_key(path: &Path, key: &Secret) { let mut path_buf = PathBuf::from(path); if let Err(e) = fs::create_dir_all(path_buf.as_path()) { warn!("Error creating key directory: {:?}", e); return; }; path_buf.push("key"); let mut file = match fs::File::create(path_buf.as_path()) { Ok(file) => file, Err(e) => { warn!("Error creating key file: {:?}", e); return; } }; if let Err(e) = file.write(&key.hex().into_bytes()) { warn!("Error writing key file: {:?}", e); } } fn load_key(path: &Path) -> Option { let mut path_buf = PathBuf::from(path); path_buf.push("key"); let mut file = match fs::File::open(path_buf.as_path()) { Ok(file) => file, Err(e) => { debug!("Error opening key file: {:?}", e); return None; } }; let mut buf = String::new(); match file.read_to_string(&mut buf) { Ok(_) => {}, Err(e) => { warn!("Error reading key file: {:?}", e); return None; } } match Secret::from_str(&buf) { Ok(key) => Some(key), Err(e) => { warn!("Error parsing key file: {:?}", e); None } } } #[test] fn key_save_load() { use ::devtools::RandomTempPath; let temp_path = RandomTempPath::create_dir(); let key = H256::random(); save_key(temp_path.as_path(), &key); let r = load_key(temp_path.as_path()); assert_eq!(key, r.unwrap()); } #[test] fn host_client_url() { let mut config = NetworkConfiguration::new(); let key = h256_from_hex("6f7b0d801bc7b5ce7bbd930b84fd0369b3eb25d09be58d64ba811091046f3aa2"); config.use_secret = Some(key); let host: Host = Host::new(config).unwrap(); assert!(host.local_url().starts_with("enode://101b3ef5a4ea7a1c7928e24c4c75fd053c235d7b80c22ae5c03d145d0ac7396e2a4ffff9adee3133a7b05044a5cee08115fd65145e5165d646bde371010d803c@")); }