18 lines
789 B
Rust
18 lines
789 B
Rust
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use std::io;
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use std::net::{IpAddr, Ipv4Addr, Ipv6Addr, SocketAddr};
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use tokio::net::TcpListener;
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pub async fn tcp_listen_any_loopback() -> io::Result<TcpListener> {
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// IPv4 is tried first for the best compatibility and performance with most systems.
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// IPv6 is also tried in case IPv4 is not available. Resolving "localhost" is avoided
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// to prevent failures deriving from improper name resolution setup. Any available
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// ephemeral port is used to prevent conflicts with other services. This is all as per
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// RFC 8252's recommendations
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const ANY_LOOPBACK_SOCKET: &[SocketAddr] = &[
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SocketAddr::new(IpAddr::V4(Ipv4Addr::LOCALHOST), 0),
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SocketAddr::new(IpAddr::V6(Ipv6Addr::LOCALHOST), 0),
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];
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TcpListener::bind(ANY_LOOPBACK_SOCKET).await
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}
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