Merge changes from topic "trusty-libbinder-rs-service" into main am: be5eaf3d35 am: bdc26fabe0 (f4680a70) · Commits · e / os / android_frameworks_native

libs/binder/rust/rpcbinder/Android.bp

+1 −0

Original line number	Diff line number	Diff line
		@@ -18,6 +18,7 @@ rust_library {
		"libbinder_ndk_sys",
		"libbinder_rpc_unstable_bindgen_sys",
		"libbinder_rs",
		"libcfg_if",
		"libdowncast_rs",
		"libforeign_types",
		"liblibc",

libs/binder/rust/rpcbinder/src/lib.rs

+2 −2

Original line number	Diff line number	Diff line
		@@ -16,10 +16,10 @@

		//! API for RPC Binder services.

		#[cfg(not(target_os = "trusty"))]
		mod server;
		mod session;

		pub use server::RpcServer;
		#[cfg(not(target_os = "trusty"))]
		pub use server::{RpcServer, RpcServerRef};
		pub use server::RpcServerRef;
		pub use session::{FileDescriptorTransportMode, RpcSession, RpcSessionRef};

libs/binder/rust/rpcbinder/src/server.rs

+7 −155

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		@@ -14,160 +14,12 @@
		* limitations under the License.
		*/

		use crate::session::FileDescriptorTransportMode;
		use binder::{unstable_api::AsNative, SpIBinder};
		use binder_rpc_unstable_bindgen::ARpcServer;
		use foreign_types::{foreign_type, ForeignType, ForeignTypeRef};
		use std::ffi::CString;
		use std::io::{Error, ErrorKind};
		use std::os::unix::io::{IntoRawFd, OwnedFd};

		foreign_type! {
		type CType = binder_rpc_unstable_bindgen::ARpcServer;
		fn drop = binder_rpc_unstable_bindgen::ARpcServer_free;

		/// A type that represents a foreign instance of RpcServer.
		#[derive(Debug)]
		pub struct RpcServer;
		/// A borrowed RpcServer.
		pub struct RpcServerRef;
		}

		/// SAFETY: The opaque handle can be cloned freely.
		unsafe impl Send for RpcServer {}
		/// SAFETY: The underlying C++ RpcServer class is thread-safe.
		unsafe impl Sync for RpcServer {}

		impl RpcServer {
		/// Creates a binder RPC server, serving the supplied binder service implementation on the given
		/// vsock port. Only connections from the given CID are accepted.
		///
		// Set `cid` to libc::VMADDR_CID_ANY to accept connections from any client.
		// Set `cid` to libc::VMADDR_CID_LOCAL to only bind to the local vsock interface.
		pub fn new_vsock(mut service: SpIBinder, cid: u32, port: u32) -> Result<RpcServer, Error> {
		let service = service.as_native_mut();

		// SAFETY: Service ownership is transferring to the server and won't be valid afterward.
		// Plus the binder objects are threadsafe.
		unsafe {
		Self::checked_from_ptr(binder_rpc_unstable_bindgen::ARpcServer_newVsock(
		service, cid, port,
		))
		}
		}

		/// Creates a binder RPC server, serving the supplied binder service implementation on the given
		/// socket file descriptor. The socket should be bound to an address before calling this
		/// function.
		pub fn new_bound_socket(
		mut service: SpIBinder,
		socket_fd: OwnedFd,
		) -> Result<RpcServer, Error> {
		let service = service.as_native_mut();

		// SAFETY: Service ownership is transferring to the server and won't be valid afterward.
		// Plus the binder objects are threadsafe.
		// The server takes ownership of the socket FD.
		unsafe {
		Self::checked_from_ptr(binder_rpc_unstable_bindgen::ARpcServer_newBoundSocket(
		service,
		socket_fd.into_raw_fd(),
		))
		}
		}

		/// Creates a binder RPC server that bootstraps sessions using an existing Unix domain socket
		/// pair, with a given root IBinder object. Callers should create a pair of SOCK_STREAM Unix
		/// domain sockets, pass one to the server and the other to the client. Multiple client session
		/// can be created from the client end of the pair.
		pub fn new_unix_domain_bootstrap(
		mut service: SpIBinder,
		bootstrap_fd: OwnedFd,
		) -> Result<RpcServer, Error> {
		let service = service.as_native_mut();

		// SAFETY: Service ownership is transferring to the server and won't be valid afterward.
		// Plus the binder objects are threadsafe.
		// The server takes ownership of the bootstrap FD.
		unsafe {
		Self::checked_from_ptr(binder_rpc_unstable_bindgen::ARpcServer_newUnixDomainBootstrap(
		service,
		bootstrap_fd.into_raw_fd(),
		))
		}
		}

		/// Creates a binder RPC server, serving the supplied binder service implementation on the given
		/// IP address and port.
		pub fn new_inet(mut service: SpIBinder, address: &str, port: u32) -> Result<RpcServer, Error> {
		let address = match CString::new(address) {
		Ok(s) => s,
		Err(e) => {
		log::error!("Cannot convert {} to CString. Error: {:?}", address, e);
		return Err(Error::from(ErrorKind::InvalidInput));
		}
		};
		let service = service.as_native_mut();

		// SAFETY: Service ownership is transferring to the server and won't be valid afterward.
		// Plus the binder objects are threadsafe.
		unsafe {
		Self::checked_from_ptr(binder_rpc_unstable_bindgen::ARpcServer_newInet(
		service,
		address.as_ptr(),
		port,
		))
		}
		}

		unsafe fn checked_from_ptr(ptr: *mut ARpcServer) -> Result<RpcServer, Error> {
		if ptr.is_null() {
		return Err(Error::new(ErrorKind::Other, "Failed to start server"));
		}
		// SAFETY: Our caller must pass us a valid or null pointer, and we've checked that it's not
		// null.
		Ok(unsafe { RpcServer::from_ptr(ptr) })
		}
		}

		impl RpcServerRef {
		/// Sets the list of file descriptor transport modes supported by this server.
		pub fn set_supported_file_descriptor_transport_modes(
		&self,
		modes: &[FileDescriptorTransportMode],
		) {
		// SAFETY: Does not keep the pointer after returning does, nor does it
		// read past its boundary. Only passes the 'self' pointer as an opaque handle.
		unsafe {
		binder_rpc_unstable_bindgen::ARpcServer_setSupportedFileDescriptorTransportModes(
		self.as_ptr(),
		modes.as_ptr(),
		modes.len(),
		)
		}
		}

		/// Starts a new background thread and calls join(). Returns immediately.
		pub fn start(&self) {
		// SAFETY: RpcServerRef wraps a valid pointer to an ARpcServer.
		unsafe { binder_rpc_unstable_bindgen::ARpcServer_start(self.as_ptr()) };
		}

		/// Joins the RpcServer thread. The call blocks until the server terminates.
		/// This must be called from exactly one thread.
		pub fn join(&self) {
		// SAFETY: RpcServerRef wraps a valid pointer to an ARpcServer.
		unsafe { binder_rpc_unstable_bindgen::ARpcServer_join(self.as_ptr()) };
		}

		/// Shuts down the running RpcServer. Can be called multiple times and from
		/// multiple threads. Called automatically during drop().
		pub fn shutdown(&self) -> Result<(), Error> {
		// SAFETY: RpcServerRef wraps a valid pointer to an ARpcServer.
		if unsafe { binder_rpc_unstable_bindgen::ARpcServer_shutdown(self.as_ptr()) } {
		Ok(())
		cfg_if::cfg_if! {
		if #[cfg(target_os = "trusty")] {
		mod trusty;
		pub use trusty::*;
		} else {
		Err(Error::from(ErrorKind::UnexpectedEof))
		}
		mod android;
		pub use android::*;
		}
		}

libs/binder/rust/rpcbinder/src/server/android.rs

0 → 100644

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		/*
		* Copyright (C) 2024 The Android Open Source Project
		*
		* Licensed under the Apache License, Version 2.0 (the "License");
		* you may not use this file except in compliance with the License.
		* You may obtain a copy of the License at
		*
		* http://www.apache.org/licenses/LICENSE-2.0
		*
		* Unless required by applicable law or agreed to in writing, software
		* distributed under the License is distributed on an "AS IS" BASIS,
		* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
		* See the License for the specific language governing permissions and
		* limitations under the License.
		*/

		use crate::session::FileDescriptorTransportMode;
		use binder::{unstable_api::AsNative, SpIBinder};
		use binder_rpc_unstable_bindgen::ARpcServer;
		use foreign_types::{foreign_type, ForeignType, ForeignTypeRef};
		use std::ffi::CString;
		use std::io::{Error, ErrorKind};
		use std::os::unix::io::{IntoRawFd, OwnedFd};

		foreign_type! {
		type CType = binder_rpc_unstable_bindgen::ARpcServer;
		fn drop = binder_rpc_unstable_bindgen::ARpcServer_free;

		/// A type that represents a foreign instance of RpcServer.
		#[derive(Debug)]
		pub struct RpcServer;
		/// A borrowed RpcServer.
		pub struct RpcServerRef;
		}

		/// SAFETY: The opaque handle can be cloned freely.
		unsafe impl Send for RpcServer {}
		/// SAFETY: The underlying C++ RpcServer class is thread-safe.
		unsafe impl Sync for RpcServer {}

		impl RpcServer {
		/// Creates a binder RPC server, serving the supplied binder service implementation on the given
		/// vsock port. Only connections from the given CID are accepted.
		///
		// Set `cid` to libc::VMADDR_CID_ANY to accept connections from any client.
		// Set `cid` to libc::VMADDR_CID_LOCAL to only bind to the local vsock interface.
		pub fn new_vsock(mut service: SpIBinder, cid: u32, port: u32) -> Result<RpcServer, Error> {
		let service = service.as_native_mut();

		// SAFETY: Service ownership is transferring to the server and won't be valid afterward.
		// Plus the binder objects are threadsafe.
		unsafe {
		Self::checked_from_ptr(binder_rpc_unstable_bindgen::ARpcServer_newVsock(
		service, cid, port,
		))
		}
		}

		/// Creates a binder RPC server, serving the supplied binder service implementation on the given
		/// socket file descriptor. The socket should be bound to an address before calling this
		/// function.
		pub fn new_bound_socket(
		mut service: SpIBinder,
		socket_fd: OwnedFd,
		) -> Result<RpcServer, Error> {
		let service = service.as_native_mut();

		// SAFETY: Service ownership is transferring to the server and won't be valid afterward.
		// Plus the binder objects are threadsafe.
		// The server takes ownership of the socket FD.
		unsafe {
		Self::checked_from_ptr(binder_rpc_unstable_bindgen::ARpcServer_newBoundSocket(
		service,
		socket_fd.into_raw_fd(),
		))
		}
		}

		/// Creates a binder RPC server that bootstraps sessions using an existing Unix domain socket
		/// pair, with a given root IBinder object. Callers should create a pair of SOCK_STREAM Unix
		/// domain sockets, pass one to the server and the other to the client. Multiple client session
		/// can be created from the client end of the pair.
		pub fn new_unix_domain_bootstrap(
		mut service: SpIBinder,
		bootstrap_fd: OwnedFd,
		) -> Result<RpcServer, Error> {
		let service = service.as_native_mut();

		// SAFETY: Service ownership is transferring to the server and won't be valid afterward.
		// Plus the binder objects are threadsafe.
		// The server takes ownership of the bootstrap FD.
		unsafe {
		Self::checked_from_ptr(binder_rpc_unstable_bindgen::ARpcServer_newUnixDomainBootstrap(
		service,
		bootstrap_fd.into_raw_fd(),
		))
		}
		}

		/// Creates a binder RPC server, serving the supplied binder service implementation on the given
		/// IP address and port.
		pub fn new_inet(mut service: SpIBinder, address: &str, port: u32) -> Result<RpcServer, Error> {
		let address = match CString::new(address) {
		Ok(s) => s,
		Err(e) => {
		log::error!("Cannot convert {} to CString. Error: {:?}", address, e);
		return Err(Error::from(ErrorKind::InvalidInput));
		}
		};
		let service = service.as_native_mut();

		// SAFETY: Service ownership is transferring to the server and won't be valid afterward.
		// Plus the binder objects are threadsafe.
		unsafe {
		Self::checked_from_ptr(binder_rpc_unstable_bindgen::ARpcServer_newInet(
		service,
		address.as_ptr(),
		port,
		))
		}
		}

		unsafe fn checked_from_ptr(ptr: *mut ARpcServer) -> Result<RpcServer, Error> {
		if ptr.is_null() {
		return Err(Error::new(ErrorKind::Other, "Failed to start server"));
		}
		// SAFETY: Our caller must pass us a valid or null pointer, and we've checked that it's not
		// null.
		Ok(unsafe { RpcServer::from_ptr(ptr) })
		}
		}

		impl RpcServerRef {
		/// Sets the list of file descriptor transport modes supported by this server.
		pub fn set_supported_file_descriptor_transport_modes(
		&self,
		modes: &[FileDescriptorTransportMode],
		) {
		// SAFETY: Does not keep the pointer after returning does, nor does it
		// read past its boundary. Only passes the 'self' pointer as an opaque handle.
		unsafe {
		binder_rpc_unstable_bindgen::ARpcServer_setSupportedFileDescriptorTransportModes(
		self.as_ptr(),
		modes.as_ptr(),
		modes.len(),
		)
		}
		}

		/// Starts a new background thread and calls join(). Returns immediately.
		pub fn start(&self) {
		// SAFETY: RpcServerRef wraps a valid pointer to an ARpcServer.
		unsafe { binder_rpc_unstable_bindgen::ARpcServer_start(self.as_ptr()) };
		}

		/// Joins the RpcServer thread. The call blocks until the server terminates.
		/// This must be called from exactly one thread.
		pub fn join(&self) {
		// SAFETY: RpcServerRef wraps a valid pointer to an ARpcServer.
		unsafe { binder_rpc_unstable_bindgen::ARpcServer_join(self.as_ptr()) };
		}

		/// Shuts down the running RpcServer. Can be called multiple times and from
		/// multiple threads. Called automatically during drop().
		pub fn shutdown(&self) -> Result<(), Error> {
		// SAFETY: RpcServerRef wraps a valid pointer to an ARpcServer.
		if unsafe { binder_rpc_unstable_bindgen::ARpcServer_shutdown(self.as_ptr()) } {
		Ok(())
		} else {
		Err(Error::from(ErrorKind::UnexpectedEof))
		}
		}
		}

libs/binder/rust/rpcbinder/src/server/trusty.rs

0 → 100644

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		/*
		* Copyright (C) 2023 The Android Open Source Project
		*
		* Licensed under the Apache License, Version 2.0 (the "License");
		* you may not use this file except in compliance with the License.
		* You may obtain a copy of the License at
		*
		* http://www.apache.org/licenses/LICENSE-2.0
		*
		* Unless required by applicable law or agreed to in writing, software
		* distributed under the License is distributed on an "AS IS" BASIS,
		* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
		* See the License for the specific language governing permissions and
		* limitations under the License.
		*/

		use binder::{unstable_api::AsNative, SpIBinder};
		use libc::size_t;
		use std::ffi::{c_char, c_void};
		use std::ptr;
		use tipc::{ConnectResult, Handle, MessageResult, PortCfg, TipcError, UnbufferedService, Uuid};

		pub trait PerSessionCallback: Fn(Uuid) -> Option<SpIBinder> + Send + Sync + 'static {}
		impl<T> PerSessionCallback for T where T: Fn(Uuid) -> Option<SpIBinder> + Send + Sync + 'static {}

		pub struct RpcServer {
		inner: *mut binder_rpc_server_bindgen::ARpcServerTrusty,
		}

		/// SAFETY: The opaque handle points to a heap allocation
		/// that should be process-wide and not tied to the current thread.
		unsafe impl Send for RpcServer {}
		/// SAFETY: The underlying C++ RpcServer class is thread-safe.
		unsafe impl Sync for RpcServer {}

		impl Drop for RpcServer {
		fn drop(&mut self) {
		// SAFETY: `ARpcServerTrusty_delete` is the correct destructor to call
		// on pointers returned by `ARpcServerTrusty_new`.
		unsafe {
		binder_rpc_server_bindgen::ARpcServerTrusty_delete(self.inner);
		}
		}
		}

		impl RpcServer {
		/// Allocates a new RpcServer object.
		pub fn new(service: SpIBinder) -> RpcServer {
		Self::new_per_session(move \|_uuid\| Some(service.clone()))
		}

		/// Allocates a new per-session RpcServer object.
		///
		/// Per-session objects take a closure that gets called once
		/// for every new connection. The closure gets the UUID of
		/// the peer and can accept or reject that connection.
		pub fn new_per_session<F: PerSessionCallback>(f: F) -> RpcServer {
		// SAFETY: Takes ownership of the returned handle, which has correct refcount.
		let inner = unsafe {
		binder_rpc_server_bindgen::ARpcServerTrusty_newPerSession(
		Some(per_session_callback_wrapper::<F>),
		Box::into_raw(Box::new(f)).cast(),
		Some(per_session_callback_deleter::<F>),
		)
		};
		RpcServer { inner }
		}
		}

		unsafe extern "C" fn per_session_callback_wrapper<F: PerSessionCallback>(
		uuid_ptr: *const c_void,
		len: size_t,
		cb_ptr: *mut c_char,
		) -> *mut binder_rpc_server_bindgen::AIBinder {
		// SAFETY: This callback should only get called while the RpcServer is alive.
		let cb = unsafe { &mut *cb_ptr.cast::<F>() };

		if len != std::mem::size_of::<Uuid>() {
		return ptr::null_mut();
		}

		// SAFETY: On the previous lines we check that we got exactly the right amount of bytes.
		let uuid = unsafe {
		let mut uuid = std::mem::MaybeUninit::<Uuid>::uninit();
		uuid.as_mut_ptr().copy_from(uuid_ptr.cast(), 1);
		uuid.assume_init()
		};

		cb(uuid).map_or_else(ptr::null_mut, \|b\| {
		// Prevent AIBinder_decStrong from being called before AIBinder_toPlatformBinder.
		// The per-session callback in C++ is supposed to call AIBinder_decStrong on the
		// pointer we return here.
		std::mem::ManuallyDrop::new(b).as_native_mut().cast()
		})
		}

		unsafe extern "C" fn per_session_callback_deleter<F: PerSessionCallback>(cb: *mut c_char) {
		// SAFETY: shared_ptr calls this to delete the pointer we gave it.
		// It should only get called once the last shared reference goes away.
		unsafe {
		drop(Box::<F>::from_raw(cb.cast()));
		}
		}

		pub struct RpcServerConnection {
		ctx: *mut c_void,
		}

		impl Drop for RpcServerConnection {
		fn drop(&mut self) {
		// We do not need to close handle_fd since we do not own it.
		unsafe {
		binder_rpc_server_bindgen::ARpcServerTrusty_handleChannelCleanup(self.ctx);
		}
		}
		}

		impl UnbufferedService for RpcServer {
		type Connection = RpcServerConnection;

		fn on_connect(
		&self,
		_port: &PortCfg,
		handle: &Handle,
		peer: &Uuid,
		) -> tipc::Result<ConnectResult<Self::Connection>> {
		let mut conn = RpcServerConnection { ctx: std::ptr::null_mut() };
		let rc = unsafe {
		binder_rpc_server_bindgen::ARpcServerTrusty_handleConnect(
		self.inner,
		handle.as_raw_fd(),
		peer.as_ptr().cast(),
		&mut conn.ctx,
		)
		};
		if rc < 0 {
		Err(TipcError::from_uapi(rc.into()))
		} else {
		Ok(ConnectResult::Accept(conn))
		}
		}

		fn on_message(
		&self,
		conn: &Self::Connection,
		_handle: &Handle,
		buffer: &mut [u8],
		) -> tipc::Result<MessageResult> {
		assert!(buffer.is_empty());
		let rc = unsafe { binder_rpc_server_bindgen::ARpcServerTrusty_handleMessage(conn.ctx) };
		if rc < 0 {
		Err(TipcError::from_uapi(rc.into()))
		} else {
		Ok(MessageResult::MaintainConnection)
		}
		}

		fn on_disconnect(&self, conn: &Self::Connection) {
		unsafe { binder_rpc_server_bindgen::ARpcServerTrusty_handleDisconnect(conn.ctx) };
		}
		}