libbinder: add RpcTransportTipcAndroid
Adds a new Binder RPC transport in Android for Trusty IPC.
To enable code sharing between the transports, this moves
interruptableReadOrWrite into a new RpcTransportUtils.h header
that is used by RpcTransportRaw and RpcTransportTrusty.
Bug: 224644083
Test: trusty_binder_test
Change-Id: I47843560374049821cbfc36875a738083ffd5d75
diff --git a/libs/binder/RpcTrusty.cpp b/libs/binder/RpcTrusty.cpp
new file mode 100644
index 0000000..ea49eef
--- /dev/null
+++ b/libs/binder/RpcTrusty.cpp
@@ -0,0 +1,46 @@
+/*
+ * Copyright (C) 2022 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.
+ */
+
+#define LOG_TAG "RpcTrusty"
+
+#include <android-base/logging.h>
+#include <android-base/unique_fd.h>
+#include <binder/RpcSession.h>
+#include <binder/RpcTransportTipcAndroid.h>
+#include <trusty/tipc.h>
+
+namespace android {
+
+using android::base::unique_fd;
+
+sp<IBinder> RpcTrustyConnect(const char* device, const char* port) {
+ auto session = RpcSession::make(RpcTransportCtxFactoryTipcAndroid::make());
+ auto request = [=] {
+ int tipcFd = tipc_connect(device, port);
+ if (tipcFd < 0) {
+ LOG(ERROR) << "Failed to connect to Trusty service. Error code: " << tipcFd;
+ return unique_fd();
+ }
+ return unique_fd(tipcFd);
+ };
+ if (status_t status = session->setupPreconnectedClient(unique_fd{}, request); status != OK) {
+ LOG(ERROR) << "Failed to set up Trusty client. Error: " << statusToString(status).c_str();
+ return nullptr;
+ }
+ return session->getRootObject();
+}
+
+} // namespace android