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//! Resolve a Minecraft server address into an IP address and port.
use std::{
net::{IpAddr, SocketAddr},
sync::LazyLock,
};
pub use hickory_resolver::ResolveError;
use hickory_resolver::{Name, TokioResolver, name_server::TokioConnectionProvider};
use crate::address::ServerAddr;
#[doc(hidden)]
#[deprecated(note = "Renamed to ResolveError")]
pub type ResolverError = ResolveError;
static RESOLVER: LazyLock<TokioResolver> = LazyLock::new(|| {
TokioResolver::builder(TokioConnectionProvider::default())
.unwrap()
.build()
});
/// Resolve a Minecraft server address into an IP address and port.
///
/// If it's already an IP address, it's returned as-is.
pub async fn resolve_address(mut address: &ServerAddr) -> Result<SocketAddr, ResolveError> {
let redirect = resolve_srv_redirect(address).await;
if let Ok(redirect_target) = &redirect {
address = redirect_target;
}
resolve_ip_without_redirects(address).await
}
async fn resolve_ip_without_redirects(address: &ServerAddr) -> Result<SocketAddr, ResolveError> {
if let Ok(ip) = address.host.parse::<IpAddr>() {
// no need to do a lookup
return Ok(SocketAddr::new(ip, address.port));
}
let name = Name::from_ascii(&address.host)?;
let lookup_ip = RESOLVER.lookup_ip(name).await?;
let ip = lookup_ip
.iter()
.next()
.ok_or(hickory_resolver::ResolveError::from(
"No A/AAAA record found",
))?;
Ok(SocketAddr::new(ip, address.port))
}
async fn resolve_srv_redirect(address: &ServerAddr) -> Result<ServerAddr, ResolveError> {
if address.port != 25565 {
return Err(ResolveError::from("Port must be 25565 to do a SRV lookup"));
}
let query = format!("_minecraft._tcp.{}", address.host);
let res = RESOLVER.srv_lookup(query).await?;
let srv = res
.iter()
.next()
.ok_or(ResolveError::from("No SRV record found"))?;
Ok(ServerAddr {
host: srv.target().to_ascii(),
port: srv.port(),
})
}
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