bin: boundif option

README.md

@@ -38,7 +38,7 @@ socks-port = 1080
 Direct = direct
 ```
 
-More configuration examples can be found [here](https://github.com/eycorsican/leaf/blob/master/README.zh.md).
+More configuration examples can be found [here](https://github.com/eycorsican/leaf/blob/master/README.zh.md). If you want more flexible control on the config options, the JSON format should be used, up-to-date examples for the JSON format could be found in the [tests](https://github.com/eycorsican/leaf/blob/master/leaf/tests), both client-side and server-side config examples are presented there.
 
 ## TUN Mode and Gateway Mode
 

leaf-bin/src/main.rs

@@ -52,6 +52,11 @@ struct Args {
     #[argh(option, short = 't')]
     test_outbound: Option<String>,
 
+    /// bound interface, explicitly sets the OUTBOUND_INTERFACE environment variable
+    #[cfg(any(target_os = "macos", target_os = "linux"))]
+    #[argh(option, short = 'b')]
+    boundif: Option<String>,
+
     /// prints version
     #[argh(switch, short = 'V')]
     version: bool,
@@ -75,6 +80,11 @@ fn main() {
         }
     }
 
+    #[cfg(any(target_os = "macos", target_os = "linux"))]
+    if let Some(iface) = args.boundif {
+        std::env::set_var("OUTBOUND_INTERFACE", &iface);
+    }
+
     if let Some(tag) = args.test_outbound {
         let config = leaf::config::from_file(&args.config).unwrap();
         let rt = tokio::runtime::Builder::new_current_thread()