add ablility to set device GUID for wintun

examples/ping-tun.rs

@@ -33,7 +33,7 @@ async fn main() -> Result<(), Box<dyn std::error::Error>> {
 
     #[cfg(target_os = "windows")]
     config.platform(|config| {
-        config.initialize();
+        config.initialize(Some(9099482345783245345345_u128));
     });
 
     let dev = tun::create_as_async(&config)?;

src/platform/windows/device.rs

@@ -30,10 +30,9 @@ pub struct Device {
 
 impl Device {
     /// Create a new `Device` for the given `Configuration`.
-    pub fn new(config: &Configuration) -> Result<Self> {
+    pub fn new(config: &Configuration, guid: Option<u128>) -> Result<Self> {
         let wintun = unsafe { wintun::load()? };
         let tun_name = config.name.as_deref().unwrap_or("wintun");
-        let guid = Some(9099482345783245345345_u128);
         let adapter = match wintun::Adapter::open(&wintun, tun_name) {
             Ok(a) => a,
             Err(_) => wintun::Adapter::create(&wintun, tun_name, tun_name, guid)?,

src/platform/windows/mod.rs

@@ -23,15 +23,19 @@ use crate::error::*;
 
 /// Windows-only interface configuration.
 #[derive(Copy, Clone, Default, Debug)]
-pub struct Configuration {}
+pub struct Configuration {
+    pub(crate) device_guid: Option<u128>,
+}
 
 impl Configuration {
-    pub fn initialize(&mut self) {
+    pub fn initialize(&mut self, device_guid: Option<u128>) {
         log::trace!("Windows configuration initialize");
+        self.device_guid = device_guid;
     }
 }
 
 /// Create a TUN device with the given name.
 pub fn create(configuration: &C) -> Result<Device> {
-    Device::new(configuration)
+    let guid = configuration.platform.device_guid;
+    Device::new(configuration, guid)
 }