138 lines
4.1 KiB
Rust
138 lines
4.1 KiB
Rust
#![allow(clippy::missing_errors_doc, clippy::missing_panics_doc)]
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use std::net::SocketAddr;
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use eyre::bail;
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pub use mdns_sd::DaemonEvent;
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use mdns_sd::{Receiver, ServiceDaemon, ServiceEvent, ServiceInfo};
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pub const LANSPREAD_SERVICE_TYPE: &str = "_lanspread._udp.local.";
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pub struct MdnsAdvertiser {
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daemon: ServiceDaemon,
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service_info: ServiceInfo,
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pub monitor: Receiver<DaemonEvent>,
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}
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impl MdnsAdvertiser {
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pub fn new(service_type: &str, instance_name: &str, address: SocketAddr) -> eyre::Result<Self> {
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let host_name = format!("{}.local.", address.ip());
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let daemon = ServiceDaemon::new()?;
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let service_info = ServiceInfo::new(
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service_type,
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instance_name,
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&host_name,
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address.ip(),
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address.port(),
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None,
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)?;
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let monitor = daemon.monitor()?;
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// Register the service
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daemon.register(service_info.clone())?;
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Ok(Self {
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daemon,
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service_info,
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monitor,
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})
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}
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}
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impl Drop for MdnsAdvertiser {
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fn drop(&mut self) {
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let _ = self.daemon.unregister(self.service_info.get_fullname());
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let _ = self.daemon.shutdown();
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}
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}
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pub struct MdnsBrowser {
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daemon: ServiceDaemon,
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receiver: Receiver<ServiceEvent>,
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service_type: String,
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}
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impl MdnsBrowser {
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pub fn new(service_type: &str) -> eyre::Result<Self> {
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let daemon = ServiceDaemon::new()?;
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let receiver = daemon.browse(service_type)?;
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Ok(Self {
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daemon,
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receiver,
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service_type: service_type.to_string(),
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})
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}
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pub fn next_address(
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&self,
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ignore_addr: Option<SocketAddr>,
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) -> eyre::Result<Option<SocketAddr>> {
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loop {
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match self.receiver.recv() {
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Ok(ServiceEvent::ServiceResolved(info)) => {
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log::trace!("mdns ServiceResolved event: {info:?}");
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if info.ty_domain != self.service_type {
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log::trace!(
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"Got mDNS with uninteresting service type: {} (expected: {})",
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info.ty_domain,
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self.service_type,
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);
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continue;
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}
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let mut ignored_match = false;
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for address in info.get_addresses() {
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let addr = SocketAddr::new(address.to_ip_addr(), info.get_port());
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if ignore_addr.is_some_and(|ignore| ignore == addr) {
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ignored_match = true;
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log::trace!("Ignoring mDNS advertisement for local server at {addr}");
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continue;
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}
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log::info!("Found server at {addr}");
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return Ok(Some(addr));
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}
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if ignored_match {
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log::trace!(
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"Only saw ignored mDNS advertisements (probably ourselves) for {:?}",
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info.get_fullname()
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);
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continue;
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}
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log::error!("No address found in mDNS response: {info:?}");
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}
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Ok(other_event) => {
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log::trace!("mdns unrelated event: {other_event:?}");
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}
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Err(err) => {
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log::error!("mDNS browse channel closed: {err}");
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return Ok(None);
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}
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}
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}
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}
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}
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impl Drop for MdnsBrowser {
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fn drop(&mut self) {
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let _ = self.daemon.shutdown();
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}
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}
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pub fn discover_service(
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service_type: &str,
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ignore_addr: Option<SocketAddr>,
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) -> eyre::Result<SocketAddr> {
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// Currently unused; kept for potential one-off discovery callers that just need a single address.
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let browser = MdnsBrowser::new(service_type)?;
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match browser.next_address(ignore_addr)? {
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Some(addr) => Ok(addr),
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None => bail!("No server found."),
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}
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}
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