Only include setup feature on Linux

src/main.rs

@@ -5,10 +5,12 @@ use std::net::IpAddr;
 use std::process::ExitCode;
 
 use tun2proxy::error::Error;
-use tun2proxy::setup::{get_default_cidrs, Setup};
 use tun2proxy::Options;
 use tun2proxy::{main_entry, Proxy};
 
+#[cfg(target_os = "linux")]
+use tun2proxy::setup::{get_default_cidrs, Setup};
+
 /// Tunnel interface to proxy
 #[derive(Parser)]
 #[command(author, version, about = "Tunnel interface to proxy.", long_about = None)]
@@ -66,6 +68,8 @@ fn main() -> ExitCode {
     }
 
     if let Err(e) = (|| -> Result<(), Error> {
+        #[cfg(target_os = "linux")]
+        {
             let mut setup: Setup;
             if args.setup == Some(ArgSetup::Auto) {
                 let bypass_tun_ip = match args.setup_ip {
@@ -83,6 +87,7 @@ fn main() -> ExitCode {
 
                 setup.drop_privileges()?;
             }
+        }
 
         main_entry(&args.tun, &args.proxy, options)?;
 

src/setup.rs

@@ -1,3 +1,5 @@
+#![cfg(target_os = "linux")]
+
 use crate::error::Error;
 use smoltcp::wire::IpCidr;
 use std::convert::TryFrom;