Dataset_Construction/projects/libp2p/rust/examples/upnp/src/main.rs

// Copyright 2023 Protocol Labs.
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// copy of this software and associated documentation files (the "Software"),
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// and/or sell copies of the Software, and to permit persons to whom the
// Software is furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
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//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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#![doc = include_str!("../README.md")]

use futures::prelude::*;
use libp2p::{noise, swarm::SwarmEvent, upnp, yamux, Multiaddr};
use std::error::Error;
use tracing_subscriber::EnvFilter;

#[tokio::main]
async fn main() -> Result<(), Box<dyn Error>> {
    let _ = tracing_subscriber::fmt()
        .with_env_filter(EnvFilter::from_default_env())
        .try_init();

    let mut swarm = libp2p::SwarmBuilder::with_new_identity()
        .with_tokio()
        .with_tcp(
            Default::default(),
            noise::Config::new,
            yamux::Config::default,
        )?
        .with_behaviour(|_| upnp::tokio::Behaviour::default())?
        .build();

    // Tell the swarm to listen on all interfaces and a random, OS-assigned
    // port.
    swarm.listen_on("/ip4/0.0.0.0/tcp/0".parse()?)?;

    // Dial the peer identified by the multi-address given as the second
    // command-line argument, if any.
    if let Some(addr) = std::env::args().nth(1) {
        let remote: Multiaddr = addr.parse()?;
        swarm.dial(remote)?;
        println!("Dialed {addr}")
    }

    loop {
        match swarm.select_next_some().await {
            SwarmEvent::NewListenAddr { address, .. } => println!("Listening on {address:?}"),
            SwarmEvent::Behaviour(upnp::Event::NewExternalAddr(addr)) => {
                println!("New external address: {addr}");
            }
            SwarmEvent::Behaviour(upnp::Event::GatewayNotFound) => {
                println!("Gateway does not support UPnP");
                break;
            }
            SwarmEvent::Behaviour(upnp::Event::NonRoutableGateway) => {
                println!("Gateway is not exposed directly to the public Internet, i.e. it itself has a private IP address.");
                break;
            }
            _ => {}
        }
    }
    Ok(())
}