net-ppp: add std example.

examples/std/Cargo.toml

@@ -8,11 +8,13 @@ license = "MIT OR Apache-2.0"
 embassy-sync = { version = "0.2.0", path = "../../embassy-sync", features = ["log"] }
 embassy-executor = { version = "0.3.0", path = "../../embassy-executor", features = ["arch-std", "executor-thread", "log", "nightly", "integrated-timers"] }
 embassy-time = { version = "0.1.2", path = "../../embassy-time", features = ["log", "std", "nightly"] }
-embassy-net = { version = "0.1.0", path = "../../embassy-net", features=[ "std", "nightly", "log", "medium-ethernet", "tcp", "udp", "dns", "dhcpv4", "proto-ipv6"] }
+embassy-net = { version = "0.1.0", path = "../../embassy-net", features=[ "std", "nightly", "log", "medium-ethernet", "medium-ip", "tcp", "udp", "dns", "dhcpv4", "proto-ipv6"] }
 embassy-net-tuntap = { version = "0.1.0", path = "../../embassy-net-tuntap" }
+embassy-net-ppp = { version = "0.1.0", path = "../../embassy-net-ppp", features = ["log"]}
 embedded-io-async = { version = "0.5.0" }
 embedded-io-adapters = { version = "0.5.0", features = ["futures-03"] }
 critical-section = { version = "1.1", features = ["std"] }
+smoltcp = { version = "0.10.0", features = ["dns-max-server-count-4"] }
 
 async-io = "1.6.0"
 env_logger = "0.9.0"

examples/std/src/bin/net_ppp.rs

@@ -0,0 +1,218 @@
+//! Testing against pppd:
+//!
+//!     echo myuser $(hostname) mypass 192.168.7.10 >> /etc/ppp/pap-secrets
+//!     socat -v -x PTY,link=pty1,rawer PTY,link=pty2,rawer
+//!     sudo pppd $PWD/pty1 115200 192.168.7.1: ms-dns 8.8.4.4 ms-dns 8.8.8.8 nodetach debug local persist silent noproxyarp
+//!     RUST_LOG=trace cargo run --bin net_ppp -- --device pty2
+//!     ping 192.168.7.10
+//!     nc 192.168.7.10 1234
+
+#![feature(type_alias_impl_trait)]
+#![feature(async_fn_in_trait, impl_trait_projections)]
+
+#[path = "../serial_port.rs"]
+mod serial_port;
+
+use async_io::Async;
+use clap::Parser;
+use embassy_executor::{Executor, Spawner};
+use embassy_net::tcp::TcpSocket;
+use embassy_net::{Config, ConfigV4, Ipv4Address, Ipv4Cidr, Stack, StackResources};
+use embassy_net_ppp::Runner;
+use embedded_io_async::Write;
+use futures::io::BufReader;
+use heapless::Vec;
+use log::*;
+use nix::sys::termios;
+use rand_core::{OsRng, RngCore};
+use static_cell::{make_static, StaticCell};
+
+use crate::serial_port::SerialPort;
+
+#[derive(Parser)]
+#[clap(version = "1.0")]
+struct Opts {
+    /// Serial port device name
+    #[clap(short, long)]
+    device: String,
+}
+
+#[embassy_executor::task]
+async fn net_task(stack: &'static Stack<embassy_net_ppp::Device<'static>>) -> ! {
+    stack.run().await
+}
+
+#[embassy_executor::task]
+async fn ppp_task(
+    stack: &'static Stack<embassy_net_ppp::Device<'static>>,
+    mut runner: Runner<'static>,
+    port: SerialPort,
+) -> ! {
+    let port = Async::new(port).unwrap();
+    let port = BufReader::new(port);
+    let port = adapter::FromFutures::new(port);
+
+    let config = embassy_net_ppp::Config {
+        username: b"myuser",
+        password: b"mypass",
+    };
+
+    runner
+        .run(port, config, |ipv4| {
+            let Some(addr) = ipv4.address else {
+                warn!("PPP did not provide an IP address.");
+                return;
+            };
+            let mut dns_servers = Vec::new();
+            for s in ipv4.dns_servers.iter().flatten() {
+                let _ = dns_servers.push(Ipv4Address::from_bytes(&s.0));
+            }
+            let config = ConfigV4::Static(embassy_net::StaticConfigV4 {
+                address: Ipv4Cidr::new(Ipv4Address::from_bytes(&addr.0), 0),
+                gateway: None,
+                dns_servers,
+            });
+            stack.set_config_v4(config);
+        })
+        .await
+        .unwrap();
+    unreachable!()
+}
+
+#[embassy_executor::task]
+async fn main_task(spawner: Spawner) {
+    let opts: Opts = Opts::parse();
+
+    // Open serial port
+    let baudrate = termios::BaudRate::B115200;
+    let port = SerialPort::new(opts.device.as_str(), baudrate).unwrap();
+
+    // Init network device
+    let state = make_static!(embassy_net_ppp::State::<4, 4>::new());
+    let (device, runner) = embassy_net_ppp::new(state);
+
+    // Generate random seed
+    let mut seed = [0; 8];
+    OsRng.fill_bytes(&mut seed);
+    let seed = u64::from_le_bytes(seed);
+
+    // Init network stack
+    let stack = &*make_static!(Stack::new(
+        device,
+        Config::default(), // don't configure IP yet
+        make_static!(StackResources::<3>::new()),
+        seed
+    ));
+
+    // Launch network task
+    spawner.spawn(net_task(stack)).unwrap();
+    spawner.spawn(ppp_task(stack, runner, port)).unwrap();
+
+    // Then we can use it!
+    let mut rx_buffer = [0; 4096];
+    let mut tx_buffer = [0; 4096];
+    let mut buf = [0; 4096];
+
+    loop {
+        let mut socket = TcpSocket::new(stack, &mut rx_buffer, &mut tx_buffer);
+        socket.set_timeout(Some(embassy_time::Duration::from_secs(10)));
+
+        info!("Listening on TCP:1234...");
+        if let Err(e) = socket.accept(1234).await {
+            warn!("accept error: {:?}", e);
+            continue;
+        }
+
+        info!("Received connection from {:?}", socket.remote_endpoint());
+
+        loop {
+            let n = match socket.read(&mut buf).await {
+                Ok(0) => {
+                    warn!("read EOF");
+                    break;
+                }
+                Ok(n) => n,
+                Err(e) => {
+                    warn!("read error: {:?}", e);
+                    break;
+                }
+            };
+
+            info!("rxd {:02x?}", &buf[..n]);
+
+            match socket.write_all(&buf[..n]).await {
+                Ok(()) => {}
+                Err(e) => {
+                    warn!("write error: {:?}", e);
+                    break;
+                }
+            };
+        }
+    }
+}
+
+static EXECUTOR: StaticCell<Executor> = StaticCell::new();
+
+fn main() {
+    env_logger::builder()
+        .filter_level(log::LevelFilter::Trace)
+        .filter_module("polling", log::LevelFilter::Info)
+        .filter_module("async_io", log::LevelFilter::Info)
+        .format_timestamp_nanos()
+        .init();
+
+    let executor = EXECUTOR.init(Executor::new());
+    executor.run(|spawner| {
+        spawner.spawn(main_task(spawner)).unwrap();
+    });
+}
+
+mod adapter {
+    use core::future::poll_fn;
+    use core::pin::Pin;
+
+    use futures::AsyncBufReadExt;
+
+    /// Adapter from `futures::io` traits.
+    #[derive(Clone)]
+    pub struct FromFutures<T: ?Sized> {
+        inner: T,
+    }
+
+    impl<T> FromFutures<T> {
+        /// Create a new adapter.
+        pub fn new(inner: T) -> Self {
+            Self { inner }
+        }
+    }
+
+    impl<T: ?Sized> embedded_io_async::ErrorType for FromFutures<T> {
+        type Error = std::io::Error;
+    }
+
+    impl<T: futures::io::AsyncRead + Unpin + ?Sized> embedded_io_async::Read for FromFutures<T> {
+        async fn read(&mut self, buf: &mut [u8]) -> Result<usize, Self::Error> {
+            poll_fn(|cx| Pin::new(&mut self.inner).poll_read(cx, buf)).await
+        }
+    }
+
+    impl<T: futures::io::AsyncBufRead + Unpin + ?Sized> embedded_io_async::BufRead for FromFutures<T> {
+        async fn fill_buf(&mut self) -> Result<&[u8], Self::Error> {
+            self.inner.fill_buf().await
+        }
+
+        fn consume(&mut self, amt: usize) {
+            Pin::new(&mut self.inner).consume(amt)
+        }
+    }
+
+    impl<T: futures::io::AsyncWrite + Unpin + ?Sized> embedded_io_async::Write for FromFutures<T> {
+        async fn write(&mut self, buf: &[u8]) -> Result<usize, Self::Error> {
+            poll_fn(|cx| Pin::new(&mut self.inner).poll_write(cx, buf)).await
+        }
+
+        async fn flush(&mut self) -> Result<(), Self::Error> {
+            poll_fn(|cx| Pin::new(&mut self.inner).poll_flush(cx)).await
+        }
+    }
+}