First commit. adding some stuff.

packages/mdnsserver/server.go

@@ -0,0 +1,49 @@
+package mdnsserver
+
+import (
+	"context"
+	"log"
+
+	"github.com/godbus/dbus/v5"
+	"github.com/holoplot/go-avahi"
+)
+
+func Run(ctx context.Context) {
+	conn, err := dbus.SystemBus()
+	if err != nil {
+		return
+	}
+	a, err := avahi.ServerNew(conn)
+	if err != nil {
+		log.Fatalf("Avahi new failed: %v", err)
+	}
+
+	eg, err := a.EntryGroupNew()
+	if err != nil {
+		log.Fatalf("EntryGroupNew() failed: %v", err)
+	}
+
+	hostname, err := a.GetHostName()
+	if err != nil {
+		log.Fatalf("GetHostName() failed: %v", err)
+	}
+
+	fqdn, err := a.GetHostNameFqdn()
+	if err != nil {
+		log.Fatalf("GetHostNameFqdn() failed: %v", err)
+	}
+
+	err = eg.AddService(avahi.InterfaceUnspec, avahi.ProtoUnspec, 0, hostname, "_my-nifty-service._tcp", "local", fqdn, 1234, nil)
+	if err != nil {
+		log.Fatalf("AddService() failed: %v", err)
+	}
+
+	err = eg.Commit()
+	if err != nil {
+		log.Fatalf("Commit() failed: %v", err)
+	}
+
+	<-ctx.Done()
+	eg.Reset()
+	conn.Close()
+}