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#![cfg(all(unix, not(any(target_os = "emscripten", target_os = "unknown"))))]
use futures::{future::{self, FutureResult}, prelude::*, try_ready};
use futures::stream::Stream;
use log::debug;
use std::{io, path::PathBuf};
use libp2p_core::{
Transport,
multiaddr::{Protocol, Multiaddr},
transport::{ListenerEvent, TransportError}
};
use tokio_uds::{UnixListener, UnixStream};
#[derive(Debug, Clone)]
pub struct UdsConfig {
}
impl UdsConfig {
#[inline]
pub fn new() -> UdsConfig {
UdsConfig {}
}
}
impl Transport for UdsConfig {
type Output = UnixStream;
type Error = io::Error;
type Listener = ListenerStream<tokio_uds::Incoming>;
type ListenerUpgrade = FutureResult<Self::Output, io::Error>;
type Dial = tokio_uds::ConnectFuture;
fn listen_on(self, addr: Multiaddr) -> Result<Self::Listener, TransportError<Self::Error>> {
if let Ok(path) = multiaddr_to_path(&addr) {
let listener = UnixListener::bind(&path);
match listener {
Ok(listener) => {
debug!("Now listening on {}", addr);
let future = ListenerStream {
stream: listener.incoming(),
addr: addr.clone(),
tell_new_addr: true
};
Ok(future)
}
Err(_) => return Err(TransportError::MultiaddrNotSupported(addr)),
}
} else {
Err(TransportError::MultiaddrNotSupported(addr))
}
}
fn dial(self, addr: Multiaddr) -> Result<Self::Dial, TransportError<Self::Error>> {
if let Ok(path) = multiaddr_to_path(&addr) {
debug!("Dialing {}", addr);
Ok(UnixStream::connect(&path))
} else {
Err(TransportError::MultiaddrNotSupported(addr))
}
}
}
fn multiaddr_to_path(addr: &Multiaddr) -> Result<PathBuf, ()> {
let mut iter = addr.iter();
let path = iter.next();
if iter.next().is_some() {
return Err(());
}
let out: PathBuf = match path {
Some(Protocol::Unix(ref path)) => path.as_ref().into(),
_ => return Err(())
};
if !out.is_absolute() {
return Err(());
}
Ok(out)
}
pub struct ListenerStream<T> {
stream: T,
addr: Multiaddr,
tell_new_addr: bool
}
impl<T> Stream for ListenerStream<T>
where
T: Stream
{
type Item = ListenerEvent<FutureResult<T::Item, T::Error>>;
type Error = T::Error;
fn poll(&mut self) -> Poll<Option<Self::Item>, Self::Error> {
if self.tell_new_addr {
self.tell_new_addr = false;
return Ok(Async::Ready(Some(ListenerEvent::NewAddress(self.addr.clone()))))
}
match try_ready!(self.stream.poll()) {
Some(item) => {
debug!("incoming connection on {}", self.addr);
Ok(Async::Ready(Some(ListenerEvent::Upgrade {
upgrade: future::ok(item),
listen_addr: self.addr.clone(),
remote_addr: self.addr.clone()
})))
}
None => Ok(Async::Ready(None))
}
}
}
#[cfg(test)]
mod tests {
use tokio::runtime::current_thread::Runtime;
use super::{multiaddr_to_path, UdsConfig};
use futures::prelude::*;
use std::{self, borrow::Cow, path::Path};
use libp2p_core::{
Transport,
multiaddr::{Protocol, Multiaddr},
transport::ListenerEvent
};
use tempfile;
use tokio_io;
#[test]
fn multiaddr_to_path_conversion() {
assert!(
multiaddr_to_path(&"/ip4/127.0.0.1/udp/1234".parse::<Multiaddr>().unwrap())
.is_err()
);
assert_eq!(
multiaddr_to_path(&Multiaddr::from(Protocol::Unix("/tmp/foo".into()))),
Ok(Path::new("/tmp/foo").to_owned())
);
assert_eq!(
multiaddr_to_path(&Multiaddr::from(Protocol::Unix("/home/bar/baz".into()))),
Ok(Path::new("/home/bar/baz").to_owned())
);
}
#[test]
fn communicating_between_dialer_and_listener() {
use std::io::Write;
let temp_dir = tempfile::tempdir().unwrap();
let socket = temp_dir.path().join("socket");
let addr = Multiaddr::from(Protocol::Unix(Cow::Owned(socket.to_string_lossy().into_owned())));
let addr2 = addr.clone();
std::thread::spawn(move || {
let tcp = UdsConfig::new();
let mut rt = Runtime::new().unwrap();
let handle = rt.handle();
let listener = tcp.listen_on(addr2).unwrap()
.filter_map(ListenerEvent::into_upgrade)
.for_each(|(sock, _)| {
sock.and_then(|sock| {
let handle_conn = tokio_io::io::read_exact(sock, [0; 3])
.map(|(_, buf)| assert_eq!(buf, [1, 2, 3]))
.map_err(|err| panic!("IO error {:?}", err));
handle.spawn(handle_conn).unwrap();
Ok(())
})
});
rt.block_on(listener).unwrap();
rt.run().unwrap();
});
std::thread::sleep(std::time::Duration::from_millis(100));
let tcp = UdsConfig::new();
let socket = tcp.dial(addr.clone()).unwrap();
let action = socket.then(|sock| -> Result<(), ()> {
sock.unwrap().write(&[0x1, 0x2, 0x3]).unwrap();
Ok(())
});
let mut rt = Runtime::new().unwrap();
let _ = rt.block_on(action).unwrap();
}
#[test]
#[ignore]
fn larger_addr_denied() {
let tcp = UdsConfig::new();
let addr = "/ip4/127.0.0.1/tcp/12345/unix//foo/bar"
.parse::<Multiaddr>()
.unwrap();
assert!(tcp.listen_on(addr).is_err());
}
#[test]
#[ignore]
fn relative_addr_denied() {
assert!("/ip4/127.0.0.1/tcp/12345/unix/./foo/bar".parse::<Multiaddr>().is_err());
}
}