IBinder sample

MarijnS95 · Mar 19, 2024 · de58966 · de58966
1 parent 8167b53
commit de58966
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Showing 3 changed files with 43 additions and 14 deletions.
diff --git a/ndk/src/binder.rs b/ndk/src/binder.rs
@@ -592,6 +592,7 @@ impl IBinder {
     pub fn class(&self) -> Option<&IBinderClass> {
         let class = unsafe { ffi::AIBinder_getClass(self.ptr.as_ptr()) };
 
+        dbg!(class);
         todo!()
         // NonNull::new(class).map(IBinderClass::from_ptr)
     }

diff --git a/sample/Cargo.toml b/sample/Cargo.toml
@@ -5,5 +5,6 @@ edition = "2021"
 
 [dependencies]
 libloading = "0.8.3"
-ndk = { path = "../ndk", all-features = true }
-ndk-sys = { path = "../ndk-sys", all-features = true }
+ndk = { path = "../ndk", features = ["binder", "api-level-29"] }
+ndk-sys = { path = "../ndk-sys" }
+rustix = { version = "0.38", features = ["pipe"] }
diff --git a/sample/src/main.rs b/sample/src/main.rs
@@ -1,15 +1,12 @@
-use std::ffi::{c_char, CString};
+use std::{
+    ffi::{c_char, CString},
+    ptr::NonNull,
+};
 
-#[repr(C)]
-struct AIBinder {}
+use ndk::binder::IBinder;
+use ndk_sys::AIBinder;
+use rustix::fd::AsFd;
 
-#[link(name = "binder_ndk")]
-extern "C" {
-    fn AIBinder_isAlive() -> bool;
-    // Loaded at runtime because it cannot be linked dynamically through the NDK as the bindings are only in LL-NDK:
-    // https://cs.android.com/android/platform/superproject/main/+/main:frameworks/native/libs/binder/ndk/libbinder_ndk.map.txt;l=96;drc=a7aa4ce8e2471f00f41c0f46495c76af478ddb06
-    // fn AServiceManager_checkService(instance: *const c_char) -> *mut AIBinder;
-}
 type AServiceManager_checkService = extern "system" fn(instance: *const c_char) -> *mut AIBinder;
 
 fn main() {
@@ -19,7 +16,7 @@ fn main() {
             .unwrap();
 
     let names = [
-        "power",
+        // "power",
         "power.stats-vendor",
         "powerstats", // https://cs.android.com/android/platform/superproject/main/+/main:frameworks/base/services/core/java/com/android/server/powerstats/PowerStatsService.java, https://cs.android.com/android/platform/superproject/main/+/main:frameworks/base/services/core/java/com/android/server/powerstats/PowerStatsService.java;l=295;drc=15978b577cc30ad2c5b8f5e9d1cd5986ea7f09ae;bpv=1;bpt=1
         "android.hardware.power.stats.IPowerStats/default", // https://android.googlesource.com/device/google/pantah/+/3c30a32/powerstats/panther/service.cpp#88
@@ -32,6 +29,36 @@ fn main() {
         let name = CString::new(name).unwrap();
         // let service = unsafe { AServiceManager_checkService(name.as_ptr()) };
         let service = service_manager_check_service(name.as_ptr());
-        dbg!(name, service);
+        let Some(binder) = NonNull::new(service) else {
+            continue;
+        };
+        let binder = unsafe { IBinder::from_ptr(binder) };
+        // dbg!(binder.class());
+        dbg!(&name, &binder);
+        dbg!(binder.is_alive());
+        dbg!(binder.is_remote());
+
+        let (r, w) = rustix::pipe::pipe().unwrap();
+
+        let dump = std::thread::spawn(move || {
+            let mut dump = String::new();
+            let mut data = vec![0u8; 1024];
+            loop {
+                let len = rustix::io::read(&r, &mut data).unwrap();
+                if len > 0 {
+                    let data = &data[..len];
+                    dump.push_str(std::str::from_utf8(data).unwrap());
+                } else {
+                    break dump;
+                }
+            }
+        });
+
+        if let Err(e) = binder.dump(w.as_fd(), &[]) {
+            eprintln!("Failed to dump {name:?}: {e:?}")
+        } else {
+            drop(w);
+            println!("{}", dump.join().unwrap());
+        }
     }
 }