Initialize Tun Interface based on platform

tun/src/options.rs

@@ -2,7 +2,7 @@ use std::io::Error;
 
 use fehler::throws;
 
-use super::TunInterface;
+use super::tokio::TunInterface;
 
 #[derive(Debug, Clone, Default)]
 #[cfg_attr(
@@ -16,6 +16,8 @@ pub struct TunOptions {
     pub no_pi: bool,
     /// (Linux) Avoid opening an existing persistant device.
     pub tun_excl: bool,
+    /// (Apple) Retrieve the tun interface
+    pub tun_retrieve: bool,
     /// (Linux) The IP address of the tun interface.
     pub address: Option<String>,
 }
@@ -47,6 +49,7 @@ impl TunOptions {
 
     #[throws]
     pub fn open(self) -> TunInterface {
-        TunInterface::new_with_options(self)?
+        let ti = super::TunInterface::new_with_options(self)?;
+        TunInterface::new(ti)?
     }
 }

tun/src/unix/apple/mod.rs

@@ -35,7 +35,14 @@ impl TunInterface {
     #[throws]
     #[instrument]
     pub fn new_with_options(options: TunOptions) -> TunInterface {
-        let ti = TunInterface::connect(0)?;
+        let ti = if options.tun_retrieve{
+            TunInterface::retrieve().ok_or(Error::new(
+                std::io::ErrorKind::NotFound,
+                "No tun interface found",
+            ))?
+        } else {
+            TunInterface::connect(0)?
+        };
         ti.configure(options)?;
         ti
     }