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#![feature(ip)]
use std::fmt;
use std::net::{IpAddr, Ipv6Addr};
use std::net::{ToSocketAddrs, UdpSocket};
use socket2::{Domain, Socket, Type};
/// The errors that can occur when trying to get IP address information.
#[derive(Debug)]
pub enum Error {
IoError(std::io::Error),
WrongIpVer(String, IpAddr),
NoLinkLocal(Ipv6Addr),
NoUla(Ipv6Addr),
NoGua(Ipv6Addr),
}
impl std::error::Error for Error {}
impl fmt::Display for Error {
fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result {
match self {
Self::IoError(e) => {
write!(fmt, "can't get ip address: io error: {}", e)
}
Self::WrongIpVer(want, got) => {
write!(fmt, "wrong ip version: expected {}, got {}", want, got)
}
Self::NoLinkLocal(ip) => {
write!(fmt, "ipv6 address {} is not a link-local address", ip)
}
Self::NoUla(ip) => write!(fmt, "ipv6 address {} is not a ula", ip),
Self::NoGua(ip) => write!(fmt, "ipv6 address {} is not a gua", ip),
}
}
}
impl From<std::io::Error> for Error {
fn from(err: std::io::Error) -> Self {
Self::IoError(err)
}
}
/// An alias for `std::result::Result` that uses `Error` as its error variant.
pub type Result<T> = std::result::Result<T, Error>;
fn get_ipv6(interface: &str, network: &str) -> Result<Ipv6Addr> {
let socket = Socket::new(Domain::IPV6, Type::DGRAM, None)?;
let sock_addr = (network, 0).to_socket_addrs()?.next().unwrap();
socket.bind_device(Some(interface.as_bytes()))?;
socket.connect(&sock_addr.into())?;
let udp: UdpSocket = socket.into();
let ip = udp.local_addr()?.ip();
match ip {
IpAddr::V4(_) => Err(Error::WrongIpVer("IPv6".into(), ip)),
IpAddr::V6(ipv6) => Ok(ipv6),
}
}
/// Get the (preferred outgoing) IPv6 link-local address
/// of the given interface.
pub fn get_ipv6_unicast_link_local(interface: &str) -> Result<Ipv6Addr> {
let ipv6 = get_ipv6(interface, "fe80::")?;
if ipv6.is_unicast_link_local() {
Ok(ipv6)
} else {
Err(Error::NoLinkLocal(ipv6))
}
}
/// Get the preferred outgoing IPv6 ULA of the given interface.
pub fn get_ipv6_unique_local(interface: &str) -> Result<Ipv6Addr> {
let ipv6 = get_ipv6(interface, "fc00::")?;
if ipv6.is_unique_local() {
Ok(ipv6)
} else {
Err(Error::NoUla(ipv6))
}
}
/// Get the preferred outgoing IPv6 GUA of the given interface.
pub fn get_ipv6_unicast_global(interface: &str) -> Result<Ipv6Addr> {
let ipv6 = get_ipv6(interface, "2000::")?;
if ipv6.is_unicast_global() {
Ok(ipv6)
} else {
Err(Error::NoGua(ipv6))
}
}
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