test(sandbox): 验证原生 TCP 与 UDP 回环隔离

frontend/src-tauri/tests/fixtures/sandbox_network_probe.rs

@@ -0,0 +1,27 @@
+//! Standalone native test probe; never shipped or used to launch extensions.
+use std::net::{SocketAddr, TcpStream, UdpSocket};
+use std::time::Duration;
+fn main() {
+    let args: Vec<_> = std::env::args().collect();
+    if args.len() != 3 {
+        std::process::exit(79);
+    }
+    let address: SocketAddr = args[2].parse().unwrap();
+    let result = match args[1].as_str() {
+        "tcp" => TcpStream::connect_timeout(&address, Duration::from_secs(2)).map(|_| ()),
+        "udp" => UdpSocket::bind(if address.is_ipv4() {
+            "0.0.0.0:0"
+        } else {
+            "[::]:0"
+        })
+        .and_then(|socket| socket.send_to(b"probe", address))
+        .map(|_| ()),
+        _ => std::process::exit(79),
+    };
+    std::process::exit(match result {
+        Ok(()) => 0,
+        Err(error) if error.raw_os_error() == Some(10013) => 77,
+        Err(error) if error.kind() == std::io::ErrorKind::TimedOut => 80,
+        Err(_) => 81,
+    });
+}