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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// option. This file may not be copied, modified, or distributed
// except according to those terms.
//! Look up MTU and interface information for a given hostname.
use std::net::{IpAddr, ToSocketAddrs as _};
fn main() {
let Some(host) = std::env::args().nth(1) else {
eprintln!("Usage: mtu-lookup <hostname>");
return;
};
let addrs: Vec<IpAddr> = host.parse().map_or_else(
|_| {
format!("{host}:0")
.to_socket_addrs()
.expect("Failed to resolve hostname")
.map(|s| s.ip())
.collect()
},
|ip| vec![ip],
);
for ip in addrs {
match mtu::interface_and_mtu(ip) {
Ok((iface, mtu)) => {
let v = if ip.is_ipv4() { "IPv4" } else { "IPv6" };
println!("{v} {ip}: MTU {mtu} on {iface}");
}
Err(e) => eprintln!("Error for {ip}: {e}"),
}
}
}