Implement linux mdns with avahi/zerconf

rs-matter/Cargo.toml

@@ -22,6 +22,7 @@ openssl = ["alloc", "dep:openssl", "foreign-types", "hmac", "sha2"]
 mbedtls = ["alloc", "dep:mbedtls"]
 rustcrypto = ["alloc", "sha2", "hmac", "pbkdf2", "hkdf", "aes", "ccm", "p256", "elliptic-curve", "crypto-bigint", "x509-cert", "rand_core"]
 embassy-net = ["dep:embassy-net", "dep:embassy-net-driver", "smoltcp"]
+zeroconf = ["dep:zeroconf"]
 
 [dependencies]
 rs-matter-macros = { version = "0.1", path = "../rs-matter-macros" }
@@ -76,6 +77,9 @@ x509-cert = { version = "0.2.0", default-features = false, features = ["pem"], o
 [target.'cfg(target_os = "macos")'.dependencies]
 astro-dnssd = { version = "0.3" }
 
+[target.'cfg(target_os = "linux")'.dependencies]
+zeroconf = { version = "0.11.1", optional = true }
+
 [target.'cfg(not(target_os = "espidf"))'.dependencies]
 mbedtls = { version = "0.9", optional = true }
 env_logger = { version = "0.10.0", optional = true }

rs-matter/src/mdns.rs

@@ -23,6 +23,8 @@ use crate::{data_model::cluster_basic_information::BasicInfoConfig, error::Error
 pub mod astro;
 pub mod builtin;
 pub mod proto;
+#[cfg(all(feature = "std", feature = "zeroconf", target_os = "linux"))]
+pub mod zeroconf;
 
 pub trait Mdns {
     fn add(&self, service: &str, mode: ServiceMode) -> Result<(), Error>;

rs-matter/src/mdns/zeroconf.rs

@@ -0,0 +1,164 @@
+use core::cell::RefCell;
+use std::collections::HashMap;
+use std::sync::mpsc::{sync_channel, SyncSender};
+
+use super::{MdnsRunBuffers, ServiceMode};
+use crate::{
+    data_model::cluster_basic_information::BasicInfoConfig,
+    error::{Error, ErrorCode},
+    transport::pipe::Pipe,
+};
+use zeroconf::{prelude::TEventLoop, service::TMdnsService, txt_record::TTxtRecord, ServiceType};
+
+/// Only for API-compatibility with builtin::MdnsRunner
+pub struct MdnsUdpBuffers(());
+
+/// Only for API-compatibility with builtin::MdnsRunner
+impl MdnsUdpBuffers {
+    #[inline(always)]
+    pub const fn new() -> Self {
+        Self(())
+    }
+}
+
+pub struct MdnsService<'a> {
+    dev_det: &'a BasicInfoConfig<'a>,
+    matter_port: u16,
+    services: RefCell<HashMap<String, SyncSender<()>>>,
+}
+
+impl<'a> MdnsService<'a> {
+    /// This constructor takes extra parameters for API-compatibility with builtin::MdnsRunner
+    pub fn new(
+        _id: u16,
+        _hostname: &str,
+        _ip: [u8; 4],
+        _ipv6: Option<([u8; 16], u32)>,
+        dev_det: &'a BasicInfoConfig<'a>,
+        matter_port: u16,
+    ) -> Self {
+        Self::native_new(dev_det, matter_port)
+    }
+
+    pub fn native_new(dev_det: &'a BasicInfoConfig<'a>, matter_port: u16) -> Self {
+        Self {
+            dev_det,
+            matter_port,
+            services: RefCell::new(HashMap::new()),
+        }
+    }
+
+    pub fn add(&self, name: &str, mode: ServiceMode) -> Result<(), Error> {
+        log::info!("Registering mDNS service {}/{:?}", name, mode);
+
+        let _ = self.remove(name);
+
+        mode.service(self.dev_det, self.matter_port, name, |service| {
+            let service_type = if !service.service_subtypes.is_empty() {
+                ServiceType::with_sub_types(
+                    service.service,
+                    service.protocol,
+                    Vec::from(service.service_subtypes),
+                )
+            } else {
+                ServiceType::new(service.service, service.protocol)
+            }
+            .map_err(|err| {
+                log::error!(
+                    "Encountered error building service type: {}",
+                    err.to_string()
+                );
+                ErrorCode::MdnsError
+            })?;
+
+            let (sender, receiver) = sync_channel(1);
+
+            let service_port = service.port;
+            let mut txt_kvs = vec![];
+            for (k, v) in service.txt_kvs {
+                txt_kvs.push((k.to_string(), v.to_string()));
+            }
+
+            std::thread::spawn(move || {
+                let mut mdns_service = zeroconf::MdnsService::new(service_type, service_port);
+
+                let mut txt_record = zeroconf::TxtRecord::new();
+                for (k, v) in txt_kvs {
+                    log::info!("mDNS TXT key {k} val {v}");
+                    if let Err(err) = txt_record.insert(&k, &v) {
+                        log::error!(
+                            "Encountered error inserting kv-pair into txt record {}",
+                            err.to_string()
+                        );
+                    }
+                }
+                mdns_service.set_txt_record(txt_record);
+
+                match mdns_service.register() {
+                    Ok(event_loop) => loop {
+                        if let Ok(()) = receiver.try_recv() {
+                            break;
+                        }
+                        if let Err(err) = event_loop.poll(std::time::Duration::from_secs(1)) {
+                            log::error!(
+                                "Failed to poll mDNS service event loop: {}",
+                                err.to_string()
+                            );
+                            break;
+                        }
+                    },
+                    Err(err) => log::error!(
+                        "Encountered error registering mDNS service: {}",
+                        err.to_string()
+                    ),
+                }
+            });
+
+            self.services.borrow_mut().insert(name.to_owned(), sender);
+
+            Ok(())
+        })
+    }
+
+    pub fn remove(&self, name: &str) -> Result<(), Error> {
+        if let Some(cancellation_notice) = self.services.borrow_mut().remove(name) {
+            log::info!("Deregistering mDNS service {}", name);
+            cancellation_notice
+                .send(())
+                .map_err(|_| ErrorCode::MdnsError)?;
+        }
+
+        Ok(())
+    }
+
+    /// Only for API-compatibility with builtin::MdnsRunner
+    pub async fn run_piped(
+        &mut self,
+        _tx_pipe: &Pipe<'_>,
+        _rx_pipe: &Pipe<'_>,
+    ) -> Result<(), Error> {
+        core::future::pending::<Result<(), Error>>().await
+    }
+
+    /// Only for API-compatibility with builtin::MdnsRunner
+    pub async fn run<D>(
+        &self,
+        _stack: &crate::transport::network::NetworkStack<D>,
+        _buffers: &mut MdnsRunBuffers,
+    ) -> Result<(), Error>
+    where
+        D: crate::transport::network::NetworkStackDriver,
+    {
+        core::future::pending::<Result<(), Error>>().await
+    }
+}
+
+impl<'a> super::Mdns for MdnsService<'a> {
+    fn add(&self, service: &str, mode: ServiceMode) -> Result<(), Error> {
+        MdnsService::add(self, service, mode)
+    }
+
+    fn remove(&self, service: &str) -> Result<(), Error> {
+        MdnsService::remove(self, service)
+    }
+}