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embassy-net-examples/Cargo.toml

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+[package]
+name = "embassy-net-examples"
+version = "0.1.0"
+authors = ["Dario Nieuwenhuis <dirbaio@dirbaio.net>"]
+edition = "2018"
+
+[dependencies]
+heapless            = { version = "0.5.6", default-features = false } 
+embassy             = { version = "0.1.0", features=["std", "log"] }
+embassy-std         = { version = "0.1.0" }
+embassy-net         = { version = "0.1.0", path = "../embassy-net", features=["std", "log"] }
+env_logger = "0.8.2"
+log = "0.4.11"
+futures = "0.3.8"
+libc = "0.2.81"
+async-io = "1.3.1"
+smoltcp = { version = "0.6.0", default-features = false }

embassy-net-examples/src/main.rs

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+#![feature(type_alias_impl_trait)]
+
+use embassy::executor::{Spawner, task};
+use embassy::io::{AsyncBufReadExt, AsyncWriteExt};
+use embassy::time::{Duration, Timer};
+use embassy::util::Forever;
+use embassy_net::*;
+use embassy_std::Executor;
+use heapless::Vec;
+use log::*;
+
+mod tuntap;
+
+use crate::tuntap::TunTapDevice;
+
+static DEVICE: Forever<TunTapDevice> = Forever::new();
+static CONFIG: Forever<StaticConfigurator> = Forever::new();
+
+#[task]
+async fn net_task() {
+    embassy_net::run().await
+}
+
+#[task]
+async fn main_task(spawner: Spawner) {
+    // Init network device
+    let device = TunTapDevice::new("tap0").unwrap();
+
+    // Static IP configuration
+    let config = StaticConfigurator::new(UpConfig {
+        address: Ipv4Cidr::new(Ipv4Address::new(192, 168, 69, 1), 24),
+        dns_servers: Vec::new(),
+        gateway: Ipv4Address::new(192, 168, 69, 100),
+    });
+
+    // Init network stack
+    embassy_net::init(DEVICE.put(device), CONFIG.put(config));
+
+    // Launch network task
+    spawner.spawn(net_task()).unwrap();
+
+    // Then we can use it!
+    let mut rx_buffer = [0; 4096];
+    let mut tx_buffer = [0; 4096];
+    let mut socket = TcpSocket::new(&mut rx_buffer, &mut tx_buffer);
+
+    socket.set_timeout(Some(embassy_net::SmolDuration::from_secs(10)));
+
+    let remote_endpoint = (Ipv4Address::new(192, 168, 69, 100), 8000);
+    info!("connecting to {:?}...", remote_endpoint);
+    let r = socket.connect(remote_endpoint).await;
+    if let Err(e) = r {
+        warn!("connect error: {:?}", e);
+        return;
+    }
+    info!("connected!");
+    loop {
+        let r = socket.write_all(b"Hello!\n").await;
+        if let Err(e) = r {
+            warn!("write error: {:?}", e);
+            return;
+        }
+    }
+}
+
+static EXECUTOR: Forever<Executor> = Forever::new();
+
+fn main() {
+    env_logger::builder()
+        .filter_level(log::LevelFilter::Debug)
+        .filter_module("async_io", log::LevelFilter::Info)
+        .format_timestamp_nanos()
+        .init();
+
+    let executor = EXECUTOR.put(Executor::new());
+    executor.run(|spawner| {
+        spawner.spawn(main_task(spawner)).unwrap();
+    });
+}

embassy-net-examples/src/tuntap.rs

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+use async_io::Async;
+use embassy::util::WakerRegistration;
+use libc;
+use smoltcp::wire::EthernetFrame;
+use std::io;
+use std::io::{Read, Write};
+use std::os::unix::io::{AsRawFd, RawFd};
+use log::*;
+
+pub const SIOCGIFMTU: libc::c_ulong = 0x8921;
+pub const SIOCGIFINDEX: libc::c_ulong = 0x8933;
+pub const ETH_P_ALL: libc::c_short = 0x0003;
+pub const TUNSETIFF: libc::c_ulong = 0x400454CA;
+pub const IFF_TUN: libc::c_int = 0x0001;
+pub const IFF_TAP: libc::c_int = 0x0002;
+pub const IFF_NO_PI: libc::c_int = 0x1000;
+
+#[repr(C)]
+#[derive(Debug)]
+struct ifreq {
+    ifr_name: [libc::c_char; libc::IF_NAMESIZE],
+    ifr_data: libc::c_int, /* ifr_ifindex or ifr_mtu */
+}
+
+fn ifreq_for(name: &str) -> ifreq {
+    let mut ifreq = ifreq {
+        ifr_name: [0; libc::IF_NAMESIZE],
+        ifr_data: 0,
+    };
+    for (i, byte) in name.as_bytes().iter().enumerate() {
+        ifreq.ifr_name[i] = *byte as libc::c_char
+    }
+    ifreq
+}
+
+fn ifreq_ioctl(
+    lower: libc::c_int,
+    ifreq: &mut ifreq,
+    cmd: libc::c_ulong,
+) -> io::Result<libc::c_int> {
+    unsafe {
+        let res = libc::ioctl(lower, cmd as _, ifreq as *mut ifreq);
+        if res == -1 {
+            return Err(io::Error::last_os_error());
+        }
+    }
+
+    Ok(ifreq.ifr_data)
+}
+
+#[derive(Debug)]
+pub struct TunTap {
+    fd: libc::c_int,
+    ifreq: ifreq,
+    mtu: usize,
+}
+
+impl AsRawFd for TunTap {
+    fn as_raw_fd(&self) -> RawFd {
+        self.fd
+    }
+}
+
+impl TunTap {
+    pub fn new(name: &str) -> io::Result<TunTap> {
+        unsafe {
+            let fd = libc::open(
+                "/dev/net/tun\0".as_ptr() as *const libc::c_char,
+                libc::O_RDWR | libc::O_NONBLOCK,
+            );
+            if fd == -1 {
+                return Err(io::Error::last_os_error());
+            }
+
+            let mut ifreq = ifreq_for(name);
+            ifreq.ifr_data = IFF_TAP | IFF_NO_PI;
+            ifreq_ioctl(fd, &mut ifreq, TUNSETIFF)?;
+
+            let socket = libc::socket(libc::AF_INET, libc::SOCK_DGRAM, libc::IPPROTO_IP);
+            if socket == -1 {
+                return Err(io::Error::last_os_error());
+            }
+
+            let ip_mtu = ifreq_ioctl(socket, &mut ifreq, SIOCGIFMTU);
+            libc::close(socket);
+            let ip_mtu = ip_mtu? as usize;
+
+            // SIOCGIFMTU returns the IP MTU (typically 1500 bytes.)
+            // smoltcp counts the entire Ethernet packet in the MTU, so add the Ethernet header size to it.
+            let mtu = ip_mtu + EthernetFrame::<&[u8]>::header_len();
+
+            Ok(TunTap { fd, mtu, ifreq })
+        }
+    }
+}
+
+impl Drop for TunTap {
+    fn drop(&mut self) {
+        unsafe {
+            libc::close(self.fd);
+        }
+    }
+}
+
+impl io::Read for TunTap {
+    fn read(&mut self, buf: &mut [u8]) -> io::Result<usize> {
+        let len = unsafe { libc::read(self.fd, buf.as_mut_ptr() as *mut libc::c_void, buf.len()) };
+        if len == -1 {
+            Err(io::Error::last_os_error())
+        } else {
+            Ok(len as usize)
+        }
+    }
+}
+
+impl io::Write for TunTap {
+    fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
+        let len = unsafe { libc::write(self.fd, buf.as_ptr() as *mut libc::c_void, buf.len()) };
+        if len == -1 {
+            Err(io::Error::last_os_error())
+        } else {
+            Ok(len as usize)
+        }
+    }
+
+    fn flush(&mut self) -> io::Result<()> {
+        Ok(())
+    }
+}
+
+pub struct TunTapDevice {
+    device: Async<TunTap>,
+    waker: WakerRegistration,
+}
+
+impl TunTapDevice {
+    pub fn new(name: &str) -> io::Result<TunTapDevice> {
+        Ok(Self {
+            device: Async::new(TunTap::new(name)?)?,
+            waker: WakerRegistration::new(),
+        })
+    }
+}
+
+use embassy_net::{LinkState, DeviceCapabilities, Packet, PacketBox, PacketBuf};
+use core::task::Waker;
+
+impl crate::Device for TunTapDevice {
+    fn is_transmit_ready(&mut self) -> bool {
+        true
+    }
+
+    fn transmit(&mut self, pkt: PacketBuf) {
+        // todo handle WouldBlock
+        match self.device.get_mut().write(&pkt) {
+            Ok(_) => {}
+            Err(e) if e.kind() == io::ErrorKind::WouldBlock => {
+                info!("transmit WouldBlock");
+            }
+            Err(e) => panic!("transmit error: {:?}", e),
+        }
+    }
+
+    fn receive(&mut self) -> Option<PacketBuf> {
+        let mut pkt = PacketBox::new(Packet::new()).unwrap();
+        loop {
+            match self.device.get_mut().read(&mut pkt[..]) {
+                Ok(n) => {
+                    return Some(pkt.slice(0..n));
+                }
+                Err(e) if e.kind() == io::ErrorKind::WouldBlock => {
+                    let ready = if let Some(mut cx) = self.waker.context() {
+                        let ready = self.device.poll_readable(&mut cx).is_ready();
+                        ready
+                    } else {
+                        false
+                    };
+                    if !ready {
+                        return None;
+                    }
+                }
+                Err(e) => panic!("read error: {:?}", e),
+            }
+        }
+    }
+
+    fn register_waker(&mut self, waker: &Waker) {
+        self.waker.register(waker)
+    }
+
+    fn capabilities(&mut self) -> DeviceCapabilities {
+        let mut caps = DeviceCapabilities::default();
+        caps.max_transmission_unit = self.device.get_ref().mtu;
+        caps
+    }
+
+    fn link_state(&mut self) -> LinkState {
+        LinkState::Up
+    }
+}