518 lines
17 KiB
Rust
518 lines
17 KiB
Rust
// Copyright 2015-2018 Parity Technologies (UK) Ltd.
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// This file is part of Parity.
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// Parity 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 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. If not, see <http://www.gnu.org/licenses/>.
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use std::{str, io};
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use std::net::SocketAddr;
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use std::collections::HashMap;
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use std::time::{Duration, Instant};
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use mio::*;
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use mio::deprecated::{Handler, EventLoop};
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use mio::tcp::*;
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use ethereum_types::H256;
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use rlp::{Rlp, RlpStream, EMPTY_LIST_RLP};
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use connection::{EncryptedConnection, Packet, Connection, MAX_PAYLOAD_SIZE};
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use handshake::Handshake;
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use io::{IoContext, StreamToken};
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use network::{Error, ErrorKind, DisconnectReason, SessionInfo, ProtocolId, PeerCapabilityInfo};
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use network::SessionCapabilityInfo;
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use host::*;
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use node_table::NodeId;
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use snappy;
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// Timeout must be less than (interval - 1).
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const PING_TIMEOUT: Duration = Duration::from_secs(60);
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const PING_INTERVAL: Duration = Duration::from_secs(120);
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const MIN_PROTOCOL_VERSION: u32 = 4;
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const MIN_COMPRESSION_PROTOCOL_VERSION: u32 = 5;
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#[derive(Debug, Clone)]
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enum ProtocolState {
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// Packets pending protocol on_connect event return.
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Pending(Vec<(Vec<u8>, u8)>),
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// Protocol connected.
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Connected,
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}
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/// Peer session over encrypted connection.
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/// When created waits for Hello packet exchange and signals ready state.
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/// Sends and receives protocol packets and handles basic packets such as ping/pong and disconnect.
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pub struct Session {
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/// Shared session information
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pub info: SessionInfo,
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/// Session ready flag. Set after successful Hello packet exchange
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had_hello: bool,
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/// Session is no longer active flag.
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expired: bool,
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ping_time: Instant,
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pong_time: Option<Instant>,
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state: State,
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// Protocol states -- accumulates pending packets until signaled as ready.
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protocol_states: HashMap<ProtocolId, ProtocolState>,
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compression: bool,
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}
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enum State {
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Handshake(Handshake),
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Session(EncryptedConnection),
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}
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/// Structure used to report various session events.
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pub enum SessionData {
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None,
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/// Session is ready to send/receive packets.
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Ready,
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/// A packet has been received
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Packet {
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/// Packet data
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data: Vec<u8>,
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/// Packet protocol ID
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protocol: [u8; 3],
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/// Zero based packet ID
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packet_id: u8,
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},
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/// Session has more data to be read
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Continue,
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}
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const PACKET_HELLO: u8 = 0x80;
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const PACKET_DISCONNECT: u8 = 0x01;
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const PACKET_PING: u8 = 0x02;
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const PACKET_PONG: u8 = 0x03;
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const PACKET_GET_PEERS: u8 = 0x04;
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const PACKET_PEERS: u8 = 0x05;
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const PACKET_USER: u8 = 0x10;
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const PACKET_LAST: u8 = 0x7f;
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impl Session {
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/// Create a new session out of completed handshake. This clones the handshake connection object
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/// and leaves the handshake in limbo to be de-registered from the event loop.
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pub fn new<Message>(io: &IoContext<Message>, socket: TcpStream, token: StreamToken, id: Option<&NodeId>,
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nonce: &H256, host: &HostInfo) -> Result<Session, Error>
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where Message: Send + Clone + Sync + 'static {
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let originated = id.is_some();
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let mut handshake = Handshake::new(token, id, socket, nonce).expect("Can't create handshake");
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let local_addr = handshake.connection.local_addr_str();
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handshake.start(io, host, originated)?;
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Ok(Session {
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state: State::Handshake(handshake),
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had_hello: false,
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info: SessionInfo {
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id: id.cloned(),
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client_version: String::new(),
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protocol_version: 0,
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capabilities: Vec::new(),
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peer_capabilities: Vec::new(),
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ping: None,
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originated,
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remote_address: "Handshake".to_owned(),
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local_address: local_addr,
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},
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ping_time: Instant::now(),
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pong_time: None,
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expired: false,
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protocol_states: HashMap::new(),
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compression: false,
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})
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}
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fn complete_handshake<Message>(&mut self, io: &IoContext<Message>, host: &HostInfo) -> Result<(), Error> where Message: Send + Sync + Clone {
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let connection = if let State::Handshake(ref mut h) = self.state {
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self.info.id = Some(h.id);
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self.info.remote_address = h.connection.remote_addr_str();
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EncryptedConnection::new(h)?
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} else {
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panic!("Unexpected state");
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};
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self.state = State::Session(connection);
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self.write_hello(io, host)?;
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Ok(())
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}
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fn connection(&self) -> &Connection {
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match self.state {
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State::Handshake(ref h) => &h.connection,
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State::Session(ref s) => &s.connection,
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}
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}
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/// Get id of the remote peer
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pub fn id(&self) -> Option<&NodeId> {
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self.info.id.as_ref()
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}
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/// Check if session is ready to send/receive data
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pub fn is_ready(&self) -> bool {
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self.had_hello
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}
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/// Mark this session as inactive to be deleted lated.
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pub fn set_expired(&mut self) {
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self.expired = true;
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}
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/// Check if this session is expired.
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pub fn expired(&self) -> bool {
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match self.state {
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State::Handshake(ref h) => self.expired || h.expired(),
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_ => self.expired,
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}
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}
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/// Check if this session is over and there is nothing to be sent.
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pub fn done(&self) -> bool {
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self.expired() && !self.connection().is_sending()
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}
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/// Get remote peer address
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pub fn remote_addr(&self) -> io::Result<SocketAddr> {
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self.connection().remote_addr()
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}
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/// Readable IO handler. Returns packet data if available.
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pub fn readable<Message>(&mut self, io: &IoContext<Message>, host: &HostInfo) -> Result<SessionData, Error> where Message: Send + Sync + Clone {
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if self.expired() {
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return Ok(SessionData::None)
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}
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let mut create_session = false;
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let mut packet_data = None;
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match self.state {
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State::Handshake(ref mut h) => {
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h.readable(io, host)?;
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if h.done() {
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create_session = true;
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}
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}
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State::Session(ref mut c) => {
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match c.readable(io)? {
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data @ Some(_) => packet_data = data,
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None => return Ok(SessionData::None)
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}
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}
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}
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if let Some(data) = packet_data {
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return Ok(self.read_packet(io, &data, host)?);
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}
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if create_session {
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self.complete_handshake(io, host)?;
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io.update_registration(self.token()).unwrap_or_else(|e| debug!(target: "network", "Token registration error: {:?}", e));
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}
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Ok(SessionData::None)
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}
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/// Writable IO handler. Sends pending packets.
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pub fn writable<Message>(&mut self, io: &IoContext<Message>, _host: &HostInfo) -> Result<(), Error> where Message: Send + Sync + Clone {
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match self.state {
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State::Handshake(ref mut h) => h.writable(io),
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State::Session(ref mut s) => s.writable(io),
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}
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}
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/// Checks if peer supports given capability
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pub fn have_capability(&self, protocol: [u8; 3]) -> bool {
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self.info.capabilities.iter().any(|c| c.protocol == protocol)
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}
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/// Checks if peer supports given capability
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pub fn capability_version(&self, protocol: [u8; 3]) -> Option<u8> {
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self.info.capabilities.iter().filter_map(|c| if c.protocol == protocol { Some(c.version) } else { None }).max()
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}
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/// Register the session socket with the event loop
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pub fn register_socket<Host:Handler<Timeout = Token>>(&self, reg: Token, event_loop: &mut EventLoop<Host>) -> Result<(), Error> {
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if self.expired() {
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return Ok(());
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}
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self.connection().register_socket(reg, event_loop)?;
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Ok(())
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}
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/// Update registration with the event loop. Should be called at the end of the IO handler.
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pub fn update_socket<Host:Handler>(&self, reg:Token, event_loop: &mut EventLoop<Host>) -> Result<(), Error> {
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self.connection().update_socket(reg, event_loop)?;
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Ok(())
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}
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/// Delete registration
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pub fn deregister_socket<Host:Handler>(&self, event_loop: &mut EventLoop<Host>) -> Result<(), Error> {
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self.connection().deregister_socket(event_loop)?;
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Ok(())
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}
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/// Send a protocol packet to peer.
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pub fn send_packet<Message>(&mut self, io: &IoContext<Message>, protocol: Option<[u8; 3]>, packet_id: u8, data: &[u8]) -> Result<(), Error>
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where Message: Send + Sync + Clone {
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if protocol.is_some() && (self.info.capabilities.is_empty() || !self.had_hello) {
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debug!(target: "network", "Sending to unconfirmed session {}, protocol: {:?}, packet: {}", self.token(), protocol.as_ref().map(|p| str::from_utf8(&p[..]).unwrap_or("??")), packet_id);
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bail!(ErrorKind::BadProtocol);
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}
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if self.expired() {
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return Err(ErrorKind::Expired.into());
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}
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let mut i = 0usize;
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let pid = match protocol {
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Some(protocol) => {
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while protocol != self.info.capabilities[i].protocol {
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i += 1;
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if i == self.info.capabilities.len() {
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debug!(target: "network", "Unknown protocol: {:?}", protocol);
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return Ok(())
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}
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}
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self.info.capabilities[i].id_offset + packet_id
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},
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None => packet_id
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};
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let mut rlp = RlpStream::new();
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rlp.append(&(u32::from(pid)));
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let mut compressed = Vec::new();
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let mut payload = data; // create a reference with local lifetime
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if self.compression {
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if payload.len() > MAX_PAYLOAD_SIZE {
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bail!(ErrorKind::OversizedPacket);
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}
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let len = snappy::compress_into(&payload, &mut compressed);
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trace!(target: "network", "compressed {} to {}", payload.len(), len);
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payload = &compressed[0..len];
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}
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rlp.append_raw(payload, 1);
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self.send(io, &rlp.drain())
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}
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/// Keep this session alive. Returns false if ping timeout happened
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pub fn keep_alive<Message>(&mut self, io: &IoContext<Message>) -> bool where Message: Send + Sync + Clone {
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if let State::Handshake(_) = self.state {
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return true;
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}
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let timed_out = if let Some(pong) = self.pong_time {
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pong.duration_since(self.ping_time) > PING_TIMEOUT
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} else {
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self.ping_time.elapsed() > PING_TIMEOUT
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};
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if !timed_out && self.ping_time.elapsed() > PING_INTERVAL {
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if let Err(e) = self.send_ping(io) {
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debug!("Error sending ping message: {:?}", e);
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}
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}
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!timed_out
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}
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pub fn token(&self) -> StreamToken {
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self.connection().token()
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}
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/// Signal that a subprotocol has handled the connection successfully and
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/// get all pending packets in order received.
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pub fn mark_connected(&mut self, protocol: ProtocolId) -> Vec<(ProtocolId, u8, Vec<u8>)> {
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match self.protocol_states.insert(protocol, ProtocolState::Connected) {
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None => Vec::new(),
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Some(ProtocolState::Connected) => {
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debug!(target: "network", "Protocol {:?} marked as connected more than once", protocol);
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Vec::new()
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}
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Some(ProtocolState::Pending(pending)) =>
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pending.into_iter().map(|(data, id)| (protocol, id, data)).collect(),
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}
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}
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fn read_packet<Message>(&mut self, io: &IoContext<Message>, packet: &Packet, host: &HostInfo) -> Result<SessionData, Error>
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where Message: Send + Sync + Clone {
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if packet.data.len() < 2 {
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return Err(ErrorKind::BadProtocol.into());
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}
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let packet_id = packet.data[0];
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if packet_id != PACKET_HELLO && packet_id != PACKET_DISCONNECT && !self.had_hello {
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return Err(ErrorKind::BadProtocol.into());
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}
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let data = if self.compression {
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let compressed = &packet.data[1..];
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if snappy::decompressed_len(&compressed)? > MAX_PAYLOAD_SIZE {
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bail!(ErrorKind::OversizedPacket);
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}
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snappy::decompress(&compressed)?
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} else {
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packet.data[1..].to_owned()
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};
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match packet_id {
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PACKET_HELLO => {
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let rlp = Rlp::new(&data); //TODO: validate rlp expected size
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self.read_hello(io, &rlp, host)?;
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Ok(SessionData::Ready)
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},
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PACKET_DISCONNECT => {
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let rlp = Rlp::new(&data);
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let reason: u8 = rlp.val_at(0)?;
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if self.had_hello {
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debug!(target:"network", "Disconnected: {}: {:?}", self.token(), DisconnectReason::from_u8(reason));
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}
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Err(ErrorKind::Disconnect(DisconnectReason::from_u8(reason)).into())
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}
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PACKET_PING => {
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self.send_pong(io)?;
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Ok(SessionData::Continue)
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},
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PACKET_PONG => {
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let time = Instant::now();
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self.pong_time = Some(time);
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self.info.ping = Some(time.duration_since(self.ping_time));
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Ok(SessionData::Continue)
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},
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PACKET_GET_PEERS => Ok(SessionData::None), //TODO;
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PACKET_PEERS => Ok(SessionData::None),
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PACKET_USER ... PACKET_LAST => {
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let mut i = 0usize;
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while packet_id >= self.info.capabilities[i].id_offset + self.info.capabilities[i].packet_count {
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i += 1;
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if i == self.info.capabilities.len() {
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debug!(target: "network", "Unknown packet: {:?}", packet_id);
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return Ok(SessionData::Continue)
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}
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}
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// map to protocol
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let protocol = self.info.capabilities[i].protocol;
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let protocol_packet_id = packet_id - self.info.capabilities[i].id_offset;
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match *self.protocol_states.entry(protocol).or_insert_with(|| ProtocolState::Pending(Vec::new())) {
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ProtocolState::Connected => {
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trace!(target: "network", "Packet {} mapped to {:?}:{}, i={}, capabilities={:?}", packet_id, protocol, protocol_packet_id, i, self.info.capabilities);
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Ok(SessionData::Packet { data, protocol, packet_id: protocol_packet_id } )
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}
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ProtocolState::Pending(ref mut pending) => {
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trace!(target: "network", "Packet {} deferred until protocol connection event completion", packet_id);
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pending.push((data, protocol_packet_id));
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Ok(SessionData::Continue)
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}
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}
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},
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_ => {
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debug!(target: "network", "Unknown packet: {:?}", packet_id);
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Ok(SessionData::Continue)
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}
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}
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}
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fn write_hello<Message>(&mut self, io: &IoContext<Message>, host: &HostInfo) -> Result<(), Error> where Message: Send + Sync + Clone {
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let mut rlp = RlpStream::new();
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rlp.append_raw(&[PACKET_HELLO as u8], 0);
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rlp.begin_list(5)
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.append(&host.protocol_version)
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.append(&host.client_version())
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.append_list(&host.capabilities)
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.append(&host.local_endpoint.address.port())
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.append(host.id());
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self.send(io, &rlp.drain())
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}
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fn read_hello<Message>(&mut self, io: &IoContext<Message>, rlp: &Rlp, host: &HostInfo) -> Result<(), Error>
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where Message: Send + Sync + Clone {
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let protocol = rlp.val_at::<u32>(0)?;
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let client_version = rlp.val_at::<String>(1)?;
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let peer_caps: Vec<PeerCapabilityInfo> = rlp.list_at(2)?;
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let id = rlp.val_at::<NodeId>(4)?;
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// Intersect with host capabilities
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// Leave only highset mutually supported capability version
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let mut caps: Vec<SessionCapabilityInfo> = Vec::new();
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for hc in &host.capabilities {
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if peer_caps.iter().any(|c| c.protocol == hc.protocol && c.version == hc.version) {
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caps.push(SessionCapabilityInfo {
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protocol: hc.protocol,
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version: hc.version,
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id_offset: 0,
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packet_count: hc.packet_count,
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});
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}
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}
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caps.retain(|c| host.capabilities.iter().any(|hc| hc.protocol == c.protocol && hc.version == c.version));
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let mut i = 0;
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while i < caps.len() {
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if caps.iter().any(|c| c.protocol == caps[i].protocol && c.version > caps[i].version) {
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caps.remove(i);
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} else {
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i += 1;
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}
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}
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// Sort capabilities alphabetically.
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caps.sort();
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i = 0;
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let mut offset: u8 = PACKET_USER;
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while i < caps.len() {
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caps[i].id_offset = offset;
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offset += caps[i].packet_count;
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i += 1;
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}
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debug!(target: "network", "Hello: {} v{} {} {:?}", client_version, protocol, id, caps);
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let protocol = ::std::cmp::min(protocol, host.protocol_version);
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self.info.protocol_version = protocol;
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self.info.client_version = client_version;
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self.info.capabilities = caps;
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self.info.peer_capabilities = peer_caps;
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if self.info.capabilities.is_empty() {
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trace!(target: "network", "No common capabilities with peer.");
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return Err(self.disconnect(io, DisconnectReason::UselessPeer));
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}
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if protocol < MIN_PROTOCOL_VERSION {
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trace!(target: "network", "Peer protocol version mismatch: {}", protocol);
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return Err(self.disconnect(io, DisconnectReason::UselessPeer));
|
|
}
|
|
self.compression = protocol >= MIN_COMPRESSION_PROTOCOL_VERSION;
|
|
self.send_ping(io)?;
|
|
self.had_hello = true;
|
|
Ok(())
|
|
}
|
|
|
|
/// Send ping packet
|
|
pub fn send_ping<Message>(&mut self, io: &IoContext<Message>) -> Result<(), Error> where Message: Send + Sync + Clone {
|
|
self.send_packet(io, None, PACKET_PING, &EMPTY_LIST_RLP)?;
|
|
self.ping_time = Instant::now();
|
|
self.pong_time = None;
|
|
Ok(())
|
|
}
|
|
|
|
fn send_pong<Message>(&mut self, io: &IoContext<Message>) -> Result<(), Error> where Message: Send + Sync + Clone {
|
|
self.send_packet(io, None, PACKET_PONG, &EMPTY_LIST_RLP)
|
|
}
|
|
|
|
/// Disconnect this session
|
|
pub fn disconnect<Message>(&mut self, io: &IoContext<Message>, reason: DisconnectReason) -> Error where Message: Send + Sync + Clone {
|
|
if let State::Session(_) = self.state {
|
|
let mut rlp = RlpStream::new();
|
|
rlp.begin_list(1);
|
|
rlp.append(&(reason as u32));
|
|
self.send_packet(io, None, PACKET_DISCONNECT, &rlp.drain()).ok();
|
|
}
|
|
ErrorKind::Disconnect(reason).into()
|
|
}
|
|
|
|
fn send<Message>(&mut self, io: &IoContext<Message>, data: &[u8]) -> Result<(), Error> where Message: Send + Sync + Clone {
|
|
match self.state {
|
|
State::Handshake(_) => {
|
|
warn!(target:"network", "Unexpected send request");
|
|
},
|
|
State::Session(ref mut s) => {
|
|
s.send_packet(io, data)?
|
|
},
|
|
}
|
|
Ok(())
|
|
}
|
|
}
|