Android系统怎么实现protectSocket调用

[qxhdev]

/// Example:
///
/// Note: the protect method could be identified as unused code on the Android
/// side and stripped by ProGuard, you may need to add a keep rule to let
/// ProGuard knows we need the code, e.g.:
///
/// -keep class com.leaf.and.aleaf.** { *; }
///
/// // Sets a callback method to protect sockets.
/// //
/// // Expects a method with the given name and signature (I)Z.
/// #[allow(non_snake_case)]
/// #[no_mangle]
/// pub unsafe extern "system" fn Java_com_leaf_and_aleaf_SimpleVpnService_setProtectSocketCallback(

看了文档 但是还是不知道怎么实现

[eycorsican]

class SimpleVpnService: VpnService() {

...

    private external fun setProtectSocketCallback(name: String)
    
    ...
    
    
    fun protectSocket(fd: Int): Boolean {
        return protect(fd)
    }
    
    ...
    
            setProtectSocketCallback("protectSocket")
            

[qxhdev]

谢谢回复！！ 我后面研究了半天调通了，大概步骤是这样:

1. 先要在rust源码里加入回调代码
   #[cfg(target_os = "android")]
   #[allow(non_snake_case)]
   #[no_mangle]
   pub unsafe extern "system" fn Java_com_xxx_xxxn_vpn_LeafJni_setCallback(
   mut env: JNIEnv,
   _object: JObject,
   class: JClass,
   name: JString,
   ) {
   let Ok(name) = env.get_string(&name) else {
   return;
   };
   let name: String = name.into();
   if let Ok(class_g) = env.new_global_ref(class) {
   leaf::mobile::callback::android::set_protect_socket_callback(class_g, name);
   }
   }

#[cfg(target_os = "android")]
#[allow(non_snake_case)]
#[no_mangle]
pub unsafe extern "system" fn JNI_OnLoad(vm: JavaVM, _: *mut std::os::raw::c_void) -> jint {
leaf::mobile::callback::android::set_jvm(vm);
JNI_VERSION_1_6
}

#[cfg(target_os = "android")]
#[allow(non_snake_case)]
#[no_mangle]
pub unsafe extern "system" fn JNI_OnUnload(_vm: JavaVM, _: *mut std::os::raw::c_void) {
leaf::mobile::callback::android::unset_protect_socket_callback();
leaf::mobile::callback::android::unset_jvm();
}
2. 重新编译Aandroid库
3. 在VpnService里通过jni调用

调用LeafJni.setCallback时传入 自己的VpnService实现对象 和 protect方法名
我是这样调用:
override fun onCreate() {
leafJni.setCallback(this, "protect")
}

[52yaoer]

你好，可以分享下这个可以编译的工程么？我自己设置的老是不对，

[52yaoer]

我这里引入报这个错误

leaf::mobile::callback::android::set_protect_socket_callback(class_g, name);
| ------------------------------------------------------------ ^^^^^^^ expected GlobalRef, found a different GlobalRef

leaf::mobile::callback::android::set_jvm(vm);
| ---------------------------------------- ^^ expected JavaVM, found a different JavaVM