1 /*
2 * Copyright (C) 2022 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #define LOG_TAG "RpcTrusty"
18
19 #include <binder/RpcSession.h>
20 #include <binder/RpcTransportTipcAndroid.h>
21 #include <binder/unique_fd.h>
22 #include <trusty/tipc.h>
23
24 namespace android {
25
26 using android::binder::unique_fd;
27
RpcTrustyConnectWithSessionInitializer(const char * device,const char * port,std::function<void (sp<RpcSession> &)> sessionInitializer)28 sp<RpcSession> RpcTrustyConnectWithSessionInitializer(
29 const char* device, const char* port,
30 std::function<void(sp<RpcSession>&)> sessionInitializer) {
31 auto session = RpcSession::make(RpcTransportCtxFactoryTipcAndroid::make());
32 // using the callback to initialize the session
33 sessionInitializer(session);
34 auto request = [=] {
35 int tipcFd = tipc_connect(device, port);
36 if (tipcFd < 0) {
37 ALOGE("Failed to connect to Trusty service. Error code: %d", tipcFd);
38 return unique_fd();
39 }
40 return unique_fd(tipcFd);
41 };
42 if (status_t status = session->setupPreconnectedClient(unique_fd{}, request); status != OK) {
43 ALOGE("Failed to set up Trusty client. Error: %s", statusToString(status).c_str());
44 return nullptr;
45 }
46 return session;
47 }
48
RpcTrustyConnect(const char * device,const char * port)49 sp<IBinder> RpcTrustyConnect(const char* device, const char* port) {
50 auto session = RpcTrustyConnectWithSessionInitializer(device, port, [](auto) {});
51 return session->getRootObject();
52 }
53
54 } // namespace android
55