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//! A crate for get local ip address,
//! without using `ifconfig` or scanning `network interface`

use std::net::UdpSocket;

/// get the local ip address, return an `Option<String>`. when it fail, return `None`.
pub fn get() -> Option<String> {
    let socket = match UdpSocket::bind("0.0.0.0:0") {
        Ok(s) => s,
        Err(_) => return None,
    };

    match socket.connect("8.8.8.8:80") {
        Ok(()) => (),
        Err(_) => return None,
    };

    match socket.local_addr() {
        Ok(addr) => return Some(addr.ip().to_string()),
        Err(_) => return None,
    };
}