Async TUN/TAP

Asynchronous allocation of TUN/TAP devices in Rust using async-std.

Getting Started

Create a tun device using TunBuilder and read from it in a loop:

```rust use asyncstd::os::unix::io::AsRawFd; use asyncstd::prelude::*; use asyncstd::task; use asynctun::result::Result; use async_tun::TunBuilder;

async fn asyncmain() -> Result<()> { let mut tun = TunBuilder::new() .name("") // If name is empty, then it is set by kernel. .tap(false) // false (default): TUN, true: TAP. .packetinfo(false) // false: IFFNOPI, default is true. .try_build() .await?;

println!("tun created, name: {}, fd: {}", tun.name(), tun.as_raw_fd());

loop {
    let mut buf = [0u8; 1024];
    let n = tun.read(&mut buf).await?;
    println!("reading {} bytes: {:?}", n, &buf[..n]);
}

}

fn main() -> Result<()> { task::blockon(asyncmain()) } ```

Run the code using sudo:

bash ➜ sudo -E /path/to/cargo run

Set up the device:

bash ➜ sudo ip link set dev <tun-name> up ➜ sudo ip a add 10.0.0.1/24 dev <tun-name>

Ping to read packets:

bash ➜ ping 10.0.0.2

Analyze the network traffic:

➜ sudo tshark -i <tun-name>

Supported Platforms

[x] Linux
[ ] FreeBSD
[ ] OpenBSD
[ ] NetBSD
[ ] Android
[ ] OSX
[ ] iOS
[ ] Solaris
[ ] Windows
[ ] QNX

Supported Flags

[x] Tun
[x] Tap
[x] No Packet Info
[ ] Multi-Queue
[ ] Owner
[ ] Group
[ ] MTU
[ ] Persistent