# SCION endhost software development kit (SDK)
Supercharge your applications with SCION's path-aware networking capabilities!
The SCION endhost SDK provides the tools and libraries necessary to build applications that can
leverage the full potential of the [SCION Internet architecture](https://www.scion.org/). It enables
developers to create path-aware, secure, and reliable applications that can intelligently select
their network paths, providing enhanced control over their network traffic.
## Usage
This crate provides the `ScionStack` type - a stateful object that is the conceptual equivalent of
the UDP/TCP/IP networking stack found in typical operating systems.
The following example demonstrates how to create a `ScionStack` and bind a path-aware UDP socket.
This type of socket automatically manages path selection, simplifying the process of sending and
receiving data over the SCION network.
```rust
use scion_proto::address::SocketAddr;
use scion_stack::resolver::{ScionDnsResolver, txt::ScionTxtDnsResolver};
use scion_stack::scionstack::{ScionStack, ScionStackBuilder};
use url::Url;
async fn socket_example() -> Result<(), Box<dyn std::error::Error>> {
let endhost_api: url::Url = "http://127.0.0.1:1234".parse()?;
let builder = ScionStackBuilder::new(endhost_api);
let scion_stack = builder.build().await?;
let socket = scion_stack.bind(None).await?;
let resolver = ScionTxtDnsResolver::new()?;
let addresses = resolver.resolve("example.com").await?;
let address = addresses.first().expect("no addresses resolved");
let destination = SocketAddr::new(*address, 8080);
socket.send_to(b"hello", destination).await?;
let mut buffer = [0u8; 1024];
let (len, src) = socket.recv_from(&mut buffer).await?;
println!("Received: {:?} from {:?}", &buffer[..len], src);
Ok(())
}
```