708 lines
24 KiB
Rust
708 lines
24 KiB
Rust
//! The `net_utils` module assists with networking
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use {
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log::*,
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rand::{thread_rng, Rng},
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socket2::{Domain, SockAddr, Socket, Type},
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std::{
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collections::{BTreeMap, HashSet},
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io::{self, Read, Write},
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net::{IpAddr, SocketAddr, TcpListener, TcpStream, ToSocketAddrs, UdpSocket},
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sync::{mpsc::channel, Arc, RwLock},
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time::{Duration, Instant},
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},
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url::Url,
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};
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mod ip_echo_server;
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use ip_echo_server::IpEchoServerMessage;
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pub use ip_echo_server::{ip_echo_server, IpEchoServer, MAX_PORT_COUNT_PER_MESSAGE};
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/// A data type representing a public Udp socket
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pub struct UdpSocketPair {
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pub addr: SocketAddr, // Public address of the socket
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pub receiver: UdpSocket, // Locally bound socket that can receive from the public address
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pub sender: UdpSocket, // Locally bound socket to send via public address
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}
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pub type PortRange = (u16, u16);
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pub(crate) const HEADER_LENGTH: usize = 4;
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pub(crate) fn ip_echo_server_reply_length() -> usize {
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let largest_ip_addr = IpAddr::from([0u16; 8]); // IPv6 variant
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HEADER_LENGTH + bincode::serialized_size(&largest_ip_addr).unwrap() as usize
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}
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fn ip_echo_server_request(
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ip_echo_server_addr: &SocketAddr,
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msg: IpEchoServerMessage,
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) -> Result<IpAddr, String> {
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let mut data = vec![0u8; ip_echo_server_reply_length()];
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let timeout = Duration::new(5, 0);
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TcpStream::connect_timeout(ip_echo_server_addr, timeout)
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.and_then(|mut stream| {
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// Start with HEADER_LENGTH null bytes to avoid looking like an HTTP GET/POST request
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let mut bytes = vec![0; HEADER_LENGTH];
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bytes.append(&mut bincode::serialize(&msg).expect("serialize IpEchoServerMessage"));
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// End with '\n' to make this request look HTTP-ish and tickle an error response back
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// from an HTTP server
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bytes.push(b'\n');
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stream.set_read_timeout(Some(Duration::new(10, 0)))?;
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stream.write_all(&bytes)?;
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stream.shutdown(std::net::Shutdown::Write)?;
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stream.read(data.as_mut_slice())
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})
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.and_then(|_| {
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// It's common for users to accidentally confuse the validator's gossip port and JSON
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// RPC port. Attempt to detect when this occurs by looking for the standard HTTP
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// response header and provide the user with a helpful error message
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if data.len() < HEADER_LENGTH {
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return Err(io::Error::new(
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io::ErrorKind::Other,
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format!("Response too short, received {} bytes", data.len()),
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));
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}
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let response_header: String =
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data[0..HEADER_LENGTH].iter().map(|b| *b as char).collect();
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if response_header != "\0\0\0\0" {
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if response_header == "HTTP" {
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let http_response = data.iter().map(|b| *b as char).collect::<String>();
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return Err(io::Error::new(
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io::ErrorKind::Other,
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format!(
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"Invalid gossip entrypoint. {} looks to be an HTTP port: {}",
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ip_echo_server_addr, http_response
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),
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));
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}
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return Err(io::Error::new(
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io::ErrorKind::Other,
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format!(
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"Invalid gossip entrypoint. {} provided an invalid response header: '{}'",
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ip_echo_server_addr, response_header
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),
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));
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}
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bincode::deserialize(&data[HEADER_LENGTH..]).map_err(|err| {
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io::Error::new(
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io::ErrorKind::Other,
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format!("Failed to deserialize: {:?}", err),
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)
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})
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})
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.map_err(|err| err.to_string())
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}
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/// Determine the public IP address of this machine by asking an ip_echo_server at the given
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/// address
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pub fn get_public_ip_addr(ip_echo_server_addr: &SocketAddr) -> Result<IpAddr, String> {
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ip_echo_server_request(ip_echo_server_addr, IpEchoServerMessage::default())
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}
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// Checks if any of the provided TCP/UDP ports are not reachable by the machine at
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// `ip_echo_server_addr`
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const DEFAULT_TIMEOUT_SECS: u64 = 5;
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const DEFAULT_RETRY_COUNT: usize = 5;
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fn do_verify_reachable_ports(
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ip_echo_server_addr: &SocketAddr,
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tcp_listeners: Vec<(u16, TcpListener)>,
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udp_sockets: &[&UdpSocket],
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timeout: u64,
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udp_retry_count: usize,
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) -> bool {
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info!(
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"Checking that tcp ports {:?} are reachable from {:?}",
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tcp_listeners, ip_echo_server_addr
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);
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let tcp_ports: Vec<_> = tcp_listeners.iter().map(|(port, _)| *port).collect();
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let _ = ip_echo_server_request(
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ip_echo_server_addr,
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IpEchoServerMessage::new(&tcp_ports, &[]),
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)
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.map_err(|err| warn!("ip_echo_server request failed: {}", err));
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let mut ok = true;
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let timeout = Duration::from_secs(timeout);
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// Wait for a connection to open on each TCP port
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for (port, tcp_listener) in tcp_listeners {
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let (sender, receiver) = channel();
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let listening_addr = tcp_listener.local_addr().unwrap();
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let thread_handle = std::thread::spawn(move || {
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debug!("Waiting for incoming connection on tcp/{}", port);
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match tcp_listener.incoming().next() {
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Some(_) => sender
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.send(())
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.unwrap_or_else(|err| warn!("send failure: {}", err)),
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None => warn!("tcp incoming failed"),
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}
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});
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match receiver.recv_timeout(timeout) {
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Ok(_) => {
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info!("tcp/{} is reachable", port);
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}
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Err(err) => {
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error!(
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"Received no response at tcp/{}, check your port configuration: {}",
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port, err
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);
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// Ugh, std rustc doesn't provide acceptng with timeout or restoring original
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// nonblocking-status of sockets because of lack of getter, only the setter...
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// So, to close the thread cleanly, just connect from here.
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// ref: https://github.com/rust-lang/rust/issues/31615
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TcpStream::connect_timeout(&listening_addr, timeout).unwrap();
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ok = false;
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}
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}
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// ensure to reap the thread
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thread_handle.join().unwrap();
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}
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if !ok {
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// No retries for TCP, abort on the first failure
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return ok;
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}
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let mut udp_ports: BTreeMap<_, _> = BTreeMap::new();
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udp_sockets.iter().for_each(|udp_socket| {
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let port = udp_socket.local_addr().unwrap().port();
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udp_ports
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.entry(port)
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.or_insert_with(Vec::new)
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.push(udp_socket);
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});
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let udp_ports: Vec<_> = udp_ports.into_iter().collect();
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info!(
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"Checking that udp ports {:?} are reachable from {:?}",
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udp_ports.iter().map(|(port, _)| port).collect::<Vec<_>>(),
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ip_echo_server_addr
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);
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'outer: for checked_ports_and_sockets in udp_ports.chunks(MAX_PORT_COUNT_PER_MESSAGE) {
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ok = false;
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for udp_remaining_retry in (0_usize..udp_retry_count).rev() {
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let (checked_ports, checked_socket_iter) = (
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checked_ports_and_sockets
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.iter()
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.map(|(port, _)| *port)
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.collect::<Vec<_>>(),
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checked_ports_and_sockets
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.iter()
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.map(|(_, sockets)| sockets)
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.flatten(),
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);
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let _ = ip_echo_server_request(
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ip_echo_server_addr,
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IpEchoServerMessage::new(&[], &checked_ports),
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)
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.map_err(|err| warn!("ip_echo_server request failed: {}", err));
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// Spawn threads at once!
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let reachable_ports = Arc::new(RwLock::new(HashSet::new()));
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let thread_handles: Vec<_> = checked_socket_iter
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.map(|udp_socket| {
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let port = udp_socket.local_addr().unwrap().port();
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let udp_socket = udp_socket.try_clone().expect("Unable to clone udp socket");
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let reachable_ports = reachable_ports.clone();
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std::thread::spawn(move || {
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let start = Instant::now();
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let original_read_timeout = udp_socket.read_timeout().unwrap();
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udp_socket
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.set_read_timeout(Some(Duration::from_millis(250)))
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.unwrap();
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loop {
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if reachable_ports.read().unwrap().contains(&port)
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|| Instant::now().duration_since(start) >= timeout
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{
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break;
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}
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let recv_result = udp_socket.recv(&mut [0; 1]);
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debug!(
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"Waited for incoming datagram on udp/{}: {:?}",
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port, recv_result
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);
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if recv_result.is_ok() {
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reachable_ports.write().unwrap().insert(port);
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break;
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}
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}
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udp_socket.set_read_timeout(original_read_timeout).unwrap();
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})
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})
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.collect();
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// Now join threads!
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// Separate from the above by collect()-ing as an intermediately step to make the iterator
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// eager not lazy so that joining happens here at once after creating bunch of threads
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// at once.
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for thread in thread_handles {
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thread.join().unwrap();
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}
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let reachable_ports = reachable_ports.read().unwrap().clone();
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if reachable_ports.len() == checked_ports.len() {
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info!(
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"checked udp ports: {:?}, reachable udp ports: {:?}",
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checked_ports, reachable_ports
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);
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ok = true;
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break;
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} else if udp_remaining_retry > 0 {
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// Might have lost a UDP packet, retry a couple times
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error!(
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"checked udp ports: {:?}, reachable udp ports: {:?}",
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checked_ports, reachable_ports
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);
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error!("There are some udp ports with no response!! Retrying...");
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} else {
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error!("Maximum retry count is reached....");
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break 'outer;
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}
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}
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}
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ok
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}
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pub fn verify_reachable_ports(
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ip_echo_server_addr: &SocketAddr,
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tcp_listeners: Vec<(u16, TcpListener)>,
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udp_sockets: &[&UdpSocket],
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) -> bool {
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do_verify_reachable_ports(
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ip_echo_server_addr,
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tcp_listeners,
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udp_sockets,
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DEFAULT_TIMEOUT_SECS,
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DEFAULT_RETRY_COUNT,
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)
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}
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pub fn parse_port_or_addr(optstr: Option<&str>, default_addr: SocketAddr) -> SocketAddr {
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if let Some(addrstr) = optstr {
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if let Ok(port) = addrstr.parse() {
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let mut addr = default_addr;
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addr.set_port(port);
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addr
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} else if let Ok(addr) = addrstr.parse() {
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addr
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} else {
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default_addr
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}
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} else {
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default_addr
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}
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}
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pub fn parse_port_range(port_range: &str) -> Option<PortRange> {
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let ports: Vec<&str> = port_range.split('-').collect();
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if ports.len() != 2 {
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return None;
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}
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let start_port = ports[0].parse();
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let end_port = ports[1].parse();
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if start_port.is_err() || end_port.is_err() {
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return None;
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}
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let start_port = start_port.unwrap();
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let end_port = end_port.unwrap();
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if end_port < start_port {
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return None;
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}
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Some((start_port, end_port))
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}
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pub fn parse_host(host: &str) -> Result<IpAddr, String> {
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// First, check if the host syntax is valid. This check is needed because addresses
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// such as `("localhost:1234", 0)` will resolve to IPs on some networks.
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let parsed_url = Url::parse(&format!("http://{}", host)).map_err(|e| e.to_string())?;
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if parsed_url.port().is_some() {
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return Err(format!("Expected port in URL: {}", host));
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}
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// Next, check to see if it resolves to an IP address
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let ips: Vec<_> = (host, 0)
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.to_socket_addrs()
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.map_err(|err| err.to_string())?
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.map(|socket_address| socket_address.ip())
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.collect();
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if ips.is_empty() {
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Err(format!("Unable to resolve host: {}", host))
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} else {
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Ok(ips[0])
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}
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}
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pub fn is_host(string: String) -> Result<(), String> {
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parse_host(&string).map(|_| ())
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}
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pub fn parse_host_port(host_port: &str) -> Result<SocketAddr, String> {
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let addrs: Vec<_> = host_port
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.to_socket_addrs()
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.map_err(|err| format!("Unable to resolve host {}: {}", host_port, err))?
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.collect();
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if addrs.is_empty() {
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Err(format!("Unable to resolve host: {}", host_port))
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} else {
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Ok(addrs[0])
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}
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}
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pub fn is_host_port(string: String) -> Result<(), String> {
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parse_host_port(&string).map(|_| ())
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}
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#[cfg(windows)]
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fn udp_socket(_reuseaddr: bool) -> io::Result<Socket> {
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let sock = Socket::new(Domain::ipv4(), Type::dgram(), None)?;
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Ok(sock)
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}
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#[cfg(not(windows))]
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fn udp_socket(reuseaddr: bool) -> io::Result<Socket> {
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use nix::sys::socket::setsockopt;
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use nix::sys::socket::sockopt::{ReuseAddr, ReusePort};
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use std::os::unix::io::AsRawFd;
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let sock = Socket::new(Domain::ipv4(), Type::dgram(), None)?;
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let sock_fd = sock.as_raw_fd();
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if reuseaddr {
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// best effort, i.e. ignore errors here, we'll get the failure in caller
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setsockopt(sock_fd, ReusePort, &true).ok();
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setsockopt(sock_fd, ReuseAddr, &true).ok();
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}
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Ok(sock)
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}
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// Find a port in the given range that is available for both TCP and UDP
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pub fn bind_common_in_range(
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ip_addr: IpAddr,
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range: PortRange,
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) -> io::Result<(u16, (UdpSocket, TcpListener))> {
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for port in range.0..range.1 {
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if let Ok((sock, listener)) = bind_common(ip_addr, port, false) {
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return Result::Ok((sock.local_addr().unwrap().port(), (sock, listener)));
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}
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}
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Err(io::Error::new(
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io::ErrorKind::Other,
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format!("No available TCP/UDP ports in {:?}", range),
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))
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}
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pub fn bind_in_range(ip_addr: IpAddr, range: PortRange) -> io::Result<(u16, UdpSocket)> {
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let sock = udp_socket(false)?;
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for port in range.0..range.1 {
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let addr = SocketAddr::new(ip_addr, port);
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if sock.bind(&SockAddr::from(addr)).is_ok() {
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let sock = sock.into_udp_socket();
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return Result::Ok((sock.local_addr().unwrap().port(), sock));
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}
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}
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Err(io::Error::new(
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io::ErrorKind::Other,
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format!("No available UDP ports in {:?}", range),
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))
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}
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// binds many sockets to the same port in a range
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pub fn multi_bind_in_range(
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ip_addr: IpAddr,
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range: PortRange,
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mut num: usize,
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) -> io::Result<(u16, Vec<UdpSocket>)> {
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if cfg!(windows) && num != 1 {
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// See https://github.com/solana-labs/solana/issues/4607
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warn!(
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"multi_bind_in_range() only supports 1 socket in windows ({} requested)",
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num
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);
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num = 1;
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}
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let mut sockets = Vec::with_capacity(num);
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const NUM_TRIES: usize = 100;
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let mut port = 0;
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let mut error = None;
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for _ in 0..NUM_TRIES {
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port = {
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let (port, _) = bind_in_range(ip_addr, range)?;
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port
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}; // drop the probe, port should be available... briefly.
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for _ in 0..num {
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let sock = bind_to(ip_addr, port, true);
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if let Ok(sock) = sock {
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sockets.push(sock);
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} else {
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error = Some(sock);
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break;
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}
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}
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if sockets.len() == num {
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break;
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} else {
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sockets.clear();
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}
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}
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if sockets.len() != num {
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error.unwrap()?;
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}
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Ok((port, sockets))
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}
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pub fn bind_to(ip_addr: IpAddr, port: u16, reuseaddr: bool) -> io::Result<UdpSocket> {
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let sock = udp_socket(reuseaddr)?;
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let addr = SocketAddr::new(ip_addr, port);
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sock.bind(&SockAddr::from(addr))
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.map(|_| sock.into_udp_socket())
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}
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|
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// binds both a UdpSocket and a TcpListener
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pub fn bind_common(
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ip_addr: IpAddr,
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port: u16,
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reuseaddr: bool,
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) -> io::Result<(UdpSocket, TcpListener)> {
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let sock = udp_socket(reuseaddr)?;
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let addr = SocketAddr::new(ip_addr, port);
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let sock_addr = SockAddr::from(addr);
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sock.bind(&sock_addr)
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.and_then(|_| TcpListener::bind(&addr).map(|listener| (sock.into_udp_socket(), listener)))
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}
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pub fn find_available_port_in_range(ip_addr: IpAddr, range: PortRange) -> io::Result<u16> {
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let (start, end) = range;
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|
let mut tries_left = end - start;
|
|
let mut rand_port = thread_rng().gen_range(start, end);
|
|
loop {
|
|
match bind_common(ip_addr, rand_port, false) {
|
|
Ok(_) => {
|
|
break Ok(rand_port);
|
|
}
|
|
Err(err) => {
|
|
if tries_left == 0 {
|
|
return Err(err);
|
|
}
|
|
}
|
|
}
|
|
rand_port += 1;
|
|
if rand_port == end {
|
|
rand_port = start;
|
|
}
|
|
tries_left -= 1;
|
|
}
|
|
}
|
|
|
|
#[cfg(test)]
|
|
mod tests {
|
|
use super::*;
|
|
use std::net::Ipv4Addr;
|
|
|
|
#[test]
|
|
fn test_parse_port_or_addr() {
|
|
let p1 = parse_port_or_addr(Some("9000"), SocketAddr::from(([1, 2, 3, 4], 1)));
|
|
assert_eq!(p1.port(), 9000);
|
|
let p2 = parse_port_or_addr(Some("127.0.0.1:7000"), SocketAddr::from(([1, 2, 3, 4], 1)));
|
|
assert_eq!(p2.port(), 7000);
|
|
let p2 = parse_port_or_addr(Some("hi there"), SocketAddr::from(([1, 2, 3, 4], 1)));
|
|
assert_eq!(p2.port(), 1);
|
|
let p3 = parse_port_or_addr(None, SocketAddr::from(([1, 2, 3, 4], 1)));
|
|
assert_eq!(p3.port(), 1);
|
|
}
|
|
|
|
#[test]
|
|
fn test_parse_port_range() {
|
|
assert_eq!(parse_port_range("garbage"), None);
|
|
assert_eq!(parse_port_range("1-"), None);
|
|
assert_eq!(parse_port_range("1-2"), Some((1, 2)));
|
|
assert_eq!(parse_port_range("1-2-3"), None);
|
|
assert_eq!(parse_port_range("2-1"), None);
|
|
}
|
|
|
|
#[test]
|
|
fn test_parse_host() {
|
|
parse_host("localhost:1234").unwrap_err();
|
|
parse_host("localhost").unwrap();
|
|
parse_host("127.0.0.0:1234").unwrap_err();
|
|
parse_host("127.0.0.0").unwrap();
|
|
}
|
|
|
|
#[test]
|
|
fn test_parse_host_port() {
|
|
parse_host_port("localhost:1234").unwrap();
|
|
parse_host_port("localhost").unwrap_err();
|
|
parse_host_port("127.0.0.0:1234").unwrap();
|
|
parse_host_port("127.0.0.0").unwrap_err();
|
|
}
|
|
|
|
#[test]
|
|
fn test_is_host_port() {
|
|
assert!(is_host_port("localhost:1234".to_string()).is_ok());
|
|
assert!(is_host_port("localhost".to_string()).is_err());
|
|
}
|
|
|
|
#[test]
|
|
fn test_bind() {
|
|
let ip_addr = IpAddr::V4(Ipv4Addr::new(0, 0, 0, 0));
|
|
assert_eq!(bind_in_range(ip_addr, (2000, 2001)).unwrap().0, 2000);
|
|
let ip_addr = IpAddr::V4(Ipv4Addr::new(0, 0, 0, 0));
|
|
let x = bind_to(ip_addr, 2002, true).unwrap();
|
|
let y = bind_to(ip_addr, 2002, true).unwrap();
|
|
assert_eq!(
|
|
x.local_addr().unwrap().port(),
|
|
y.local_addr().unwrap().port()
|
|
);
|
|
bind_to(ip_addr, 2002, false).unwrap_err();
|
|
bind_in_range(ip_addr, (2002, 2003)).unwrap_err();
|
|
|
|
let (port, v) = multi_bind_in_range(ip_addr, (2010, 2110), 10).unwrap();
|
|
for sock in &v {
|
|
assert_eq!(port, sock.local_addr().unwrap().port());
|
|
}
|
|
}
|
|
|
|
#[test]
|
|
fn test_bind_in_range_nil() {
|
|
let ip_addr = IpAddr::V4(Ipv4Addr::new(0, 0, 0, 0));
|
|
bind_in_range(ip_addr, (2000, 2000)).unwrap_err();
|
|
bind_in_range(ip_addr, (2000, 1999)).unwrap_err();
|
|
}
|
|
|
|
#[test]
|
|
fn test_find_available_port_in_range() {
|
|
let ip_addr = IpAddr::V4(Ipv4Addr::new(0, 0, 0, 0));
|
|
assert_eq!(
|
|
find_available_port_in_range(ip_addr, (3000, 3001)).unwrap(),
|
|
3000
|
|
);
|
|
let port = find_available_port_in_range(ip_addr, (3000, 3050)).unwrap();
|
|
assert!((3000..3050).contains(&port));
|
|
|
|
let _socket = bind_to(ip_addr, port, false).unwrap();
|
|
find_available_port_in_range(ip_addr, (port, port + 1)).unwrap_err();
|
|
}
|
|
|
|
#[test]
|
|
fn test_bind_common_in_range() {
|
|
let ip_addr = IpAddr::V4(Ipv4Addr::new(0, 0, 0, 0));
|
|
let (port, _sockets) = bind_common_in_range(ip_addr, (3100, 3150)).unwrap();
|
|
assert!((3100..3150).contains(&port));
|
|
|
|
bind_common_in_range(ip_addr, (port, port + 1)).unwrap_err();
|
|
}
|
|
|
|
#[test]
|
|
fn test_get_public_ip_addr_none() {
|
|
solana_logger::setup();
|
|
let ip_addr = IpAddr::V4(Ipv4Addr::new(0, 0, 0, 0));
|
|
let (_server_port, (server_udp_socket, server_tcp_listener)) =
|
|
bind_common_in_range(ip_addr, (3200, 3250)).unwrap();
|
|
|
|
let _runtime = ip_echo_server(server_tcp_listener);
|
|
|
|
let server_ip_echo_addr = server_udp_socket.local_addr().unwrap();
|
|
assert_eq!(
|
|
get_public_ip_addr(&server_ip_echo_addr),
|
|
parse_host("127.0.0.1"),
|
|
);
|
|
|
|
assert!(verify_reachable_ports(&server_ip_echo_addr, vec![], &[],));
|
|
}
|
|
|
|
#[test]
|
|
fn test_get_public_ip_addr_reachable() {
|
|
solana_logger::setup();
|
|
let ip_addr = IpAddr::V4(Ipv4Addr::new(0, 0, 0, 0));
|
|
let (_server_port, (server_udp_socket, server_tcp_listener)) =
|
|
bind_common_in_range(ip_addr, (3200, 3250)).unwrap();
|
|
let (client_port, (client_udp_socket, client_tcp_listener)) =
|
|
bind_common_in_range(ip_addr, (3200, 3250)).unwrap();
|
|
|
|
let _runtime = ip_echo_server(server_tcp_listener);
|
|
|
|
let ip_echo_server_addr = server_udp_socket.local_addr().unwrap();
|
|
assert_eq!(
|
|
get_public_ip_addr(&ip_echo_server_addr),
|
|
parse_host("127.0.0.1"),
|
|
);
|
|
|
|
assert!(verify_reachable_ports(
|
|
&ip_echo_server_addr,
|
|
vec![(client_port, client_tcp_listener)],
|
|
&[&client_udp_socket],
|
|
));
|
|
}
|
|
|
|
#[test]
|
|
fn test_get_public_ip_addr_tcp_unreachable() {
|
|
solana_logger::setup();
|
|
let ip_addr = IpAddr::V4(Ipv4Addr::new(0, 0, 0, 0));
|
|
let (_server_port, (server_udp_socket, _server_tcp_listener)) =
|
|
bind_common_in_range(ip_addr, (3200, 3250)).unwrap();
|
|
|
|
// make the socket unreachable by not running the ip echo server!
|
|
|
|
let server_ip_echo_addr = server_udp_socket.local_addr().unwrap();
|
|
|
|
let (correct_client_port, (_client_udp_socket, client_tcp_listener)) =
|
|
bind_common_in_range(ip_addr, (3200, 3250)).unwrap();
|
|
|
|
assert!(!do_verify_reachable_ports(
|
|
&server_ip_echo_addr,
|
|
vec![(correct_client_port, client_tcp_listener)],
|
|
&[],
|
|
2,
|
|
3,
|
|
));
|
|
}
|
|
|
|
#[test]
|
|
fn test_get_public_ip_addr_udp_unreachable() {
|
|
solana_logger::setup();
|
|
let ip_addr = IpAddr::V4(Ipv4Addr::new(0, 0, 0, 0));
|
|
let (_server_port, (server_udp_socket, _server_tcp_listener)) =
|
|
bind_common_in_range(ip_addr, (3200, 3250)).unwrap();
|
|
|
|
// make the socket unreachable by not running the ip echo server!
|
|
|
|
let server_ip_echo_addr = server_udp_socket.local_addr().unwrap();
|
|
|
|
let (_correct_client_port, (client_udp_socket, _client_tcp_listener)) =
|
|
bind_common_in_range(ip_addr, (3200, 3250)).unwrap();
|
|
|
|
assert!(!do_verify_reachable_ports(
|
|
&server_ip_echo_addr,
|
|
vec![],
|
|
&[&client_udp_socket],
|
|
2,
|
|
3,
|
|
));
|
|
}
|
|
}
|