1 //
2 // Copyright (C) 2016 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 #include "trunks/trunks_binder_proxy.h"
18
19 #include <base/bind.h>
20 #include <base/callback.h>
21 #include <base/logging.h>
22 #include <binderwrapper/binder_wrapper.h>
23 #include <utils/Errors.h>
24
25 #include "android/trunks/BnTrunksClient.h"
26 #include "android/trunks/BpTrunks.h"
27 #include "trunks/binder_interface.h"
28 #include "trunks/error_codes.h"
29 #include "trunks/interface.pb.h"
30
31 namespace {
32
33 // Implements ITrunksClient and forwards response data to a ResponseCallback.
34 class ResponseObserver : public android::trunks::BnTrunksClient {
35 public:
ResponseObserver(const trunks::CommandTransceiver::ResponseCallback & callback)36 explicit ResponseObserver(
37 const trunks::CommandTransceiver::ResponseCallback& callback)
38 : callback_(callback) {}
39
40 // ITrunksClient interface.
OnCommandResponse(const std::vector<uint8_t> & response_proto_data)41 android::binder::Status OnCommandResponse(
42 const std::vector<uint8_t>& response_proto_data) override {
43 trunks::SendCommandResponse response_proto;
44 if (!response_proto.ParseFromArray(response_proto_data.data(),
45 response_proto_data.size())) {
46 LOG(ERROR) << "TrunksBinderProxy: Bad response data.";
47 callback_.Run(
48 trunks::CreateErrorResponse(trunks::SAPI_RC_MALFORMED_RESPONSE));
49 }
50 callback_.Run(response_proto.response());
51 return android::binder::Status::ok();
52 }
53
54 private:
55 trunks::CommandTransceiver::ResponseCallback callback_;
56 };
57
58 } // namespace
59
60 namespace trunks {
61
Init()62 bool TrunksBinderProxy::Init() {
63 android::sp<android::IBinder> service_binder =
64 android::BinderWrapper::GetOrCreateInstance()->GetService(
65 kTrunksServiceName);
66 if (!service_binder.get()) {
67 LOG(ERROR) << "TrunksBinderProxy: Trunks service does not exist.";
68 return false;
69 }
70 trunks_service_ = new android::trunks::BpTrunks(service_binder);
71 return true;
72 }
73
SendCommand(const std::string & command,const ResponseCallback & callback)74 void TrunksBinderProxy::SendCommand(const std::string& command,
75 const ResponseCallback& callback) {
76 SendCommandRequest command_proto;
77 command_proto.set_command(command);
78 std::vector<uint8_t> command_proto_data;
79 command_proto_data.resize(command_proto.ByteSize());
80 if (!command_proto.SerializeToArray(command_proto_data.data(),
81 command_proto_data.size())) {
82 LOG(ERROR) << "TrunksBinderProxy: Failed to serialize protobuf.";
83 callback.Run(CreateErrorResponse(TRUNKS_RC_IPC_ERROR));
84 return;
85 }
86 android::sp<ResponseObserver> observer(new ResponseObserver(callback));
87 android::binder::Status status =
88 trunks_service_->SendCommand(command_proto_data, observer);
89 if (!status.isOk()) {
90 LOG(ERROR) << "TrunksBinderProxy: Binder error: " << status.toString8();
91 callback.Run(CreateErrorResponse(TRUNKS_RC_IPC_ERROR));
92 return;
93 }
94 }
95
SendCommandAndWait(const std::string & command)96 std::string TrunksBinderProxy::SendCommandAndWait(const std::string& command) {
97 SendCommandRequest command_proto;
98 command_proto.set_command(command);
99 std::vector<uint8_t> command_proto_data;
100 command_proto_data.resize(command_proto.ByteSize());
101 if (!command_proto.SerializeToArray(command_proto_data.data(),
102 command_proto_data.size())) {
103 LOG(ERROR) << "TrunksBinderProxy: Failed to serialize protobuf.";
104 return CreateErrorResponse(TRUNKS_RC_IPC_ERROR);
105 }
106 std::vector<uint8_t> response_proto_data;
107 android::binder::Status status = trunks_service_->SendCommandAndWait(
108 command_proto_data, &response_proto_data);
109 if (!status.isOk()) {
110 LOG(ERROR) << "TrunksBinderProxy: Binder error: " << status.toString8();
111 return CreateErrorResponse(TRUNKS_RC_IPC_ERROR);
112 }
113 trunks::SendCommandResponse response_proto;
114 if (!response_proto.ParseFromArray(response_proto_data.data(),
115 response_proto_data.size())) {
116 LOG(ERROR) << "TrunksBinderProxy: Bad response data.";
117 return trunks::CreateErrorResponse(trunks::SAPI_RC_MALFORMED_RESPONSE);
118 }
119 return response_proto.response();
120 }
121
122 } // namespace trunks
123