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extern crate ipnetwork;
extern crate pnet;
use ipnetwork::IpNetwork;
use pnet::datalink;
use std::net::IpAddr;
fn maybe_tailscale(s: &str) -> bool {
s.starts_with("wg")
|| s.starts_with("ts")
|| s.starts_with("tailscale")
|| s.starts_with("utun")
}
pub fn interface() -> Option<IpAddr> {
let ifaces = datalink::interfaces();
let netmask: IpNetwork = "100.64.0.0/10".parse().unwrap();
ifaces
.iter()
.filter(|iface| maybe_tailscale(&iface.name))
.map(|iface| iface.ips.clone())
.flatten()
.filter(|ipnet| ipnet.is_ipv4() && netmask.contains(ipnet.network()))
.map(|ipnet| ipnet.ip())
.next()
}