1 // 2 // Copyright (C) 2014 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_dbus_proxy.h" 18 19 #include <base/bind.h> 20 #include <brillo/bind_lambda.h> 21 #include <brillo/dbus/dbus_method_invoker.h> 22 23 #include "trunks/dbus_interface.h" 24 #include "trunks/error_codes.h" 25 #include "trunks/interface.pb.h" 26 27 namespace { 28 29 // Use a five minute timeout because some commands on some TPM hardware can take 30 // a very long time. If a few lengthy operations are already in the queue, a 31 // subsequent command needs to wait for all of them. Timeouts are always 32 // possible but under normal conditions 5 minutes seems to be plenty. 33 const int kDBusMaxTimeout = 5 * 60 * 1000; 34 35 } // namespace 36 37 namespace trunks { 38 39 TrunksDBusProxy::TrunksDBusProxy() : weak_factory_(this) {} 40 41 TrunksDBusProxy::~TrunksDBusProxy() { 42 if (bus_) { 43 bus_->ShutdownAndBlock(); 44 } 45 } 46 47 bool TrunksDBusProxy::Init() { 48 dbus::Bus::Options options; 49 options.bus_type = dbus::Bus::SYSTEM; 50 bus_ = new dbus::Bus(options); 51 object_proxy_ = bus_->GetObjectProxy( 52 trunks::kTrunksServiceName, dbus::ObjectPath(trunks::kTrunksServicePath)); 53 origin_thread_id_ = base::PlatformThread::CurrentId(); 54 return (object_proxy_ != nullptr); 55 } 56 57 void TrunksDBusProxy::SendCommand(const std::string& command, 58 const ResponseCallback& callback) { 59 if (origin_thread_id_ != base::PlatformThread::CurrentId()) { 60 LOG(ERROR) << "Error TrunksDBusProxy cannot be shared by multiple threads."; 61 callback.Run(CreateErrorResponse(TRUNKS_RC_IPC_ERROR)); 62 } 63 SendCommandRequest tpm_command_proto; 64 tpm_command_proto.set_command(command); 65 auto on_success = [callback](const SendCommandResponse& response) { 66 callback.Run(response.response()); 67 }; 68 auto on_error = [callback](brillo::Error* error) { 69 SendCommandResponse response; 70 response.set_response(CreateErrorResponse(SAPI_RC_NO_RESPONSE_RECEIVED)); 71 callback.Run(response.response()); 72 }; 73 brillo::dbus_utils::CallMethodWithTimeout( 74 kDBusMaxTimeout, object_proxy_, trunks::kTrunksInterface, 75 trunks::kSendCommand, base::Bind(on_success), base::Bind(on_error), 76 tpm_command_proto); 77 } 78 79 std::string TrunksDBusProxy::SendCommandAndWait(const std::string& command) { 80 if (origin_thread_id_ != base::PlatformThread::CurrentId()) { 81 LOG(ERROR) << "Error TrunksDBusProxy cannot be shared by multiple threads."; 82 return CreateErrorResponse(TRUNKS_RC_IPC_ERROR); 83 } 84 SendCommandRequest tpm_command_proto; 85 tpm_command_proto.set_command(command); 86 brillo::ErrorPtr error; 87 std::unique_ptr<dbus::Response> dbus_response = 88 brillo::dbus_utils::CallMethodAndBlockWithTimeout( 89 kDBusMaxTimeout, object_proxy_, trunks::kTrunksInterface, 90 trunks::kSendCommand, &error, tpm_command_proto); 91 SendCommandResponse tpm_response_proto; 92 if (dbus_response.get() && 93 brillo::dbus_utils::ExtractMethodCallResults(dbus_response.get(), &error, 94 &tpm_response_proto)) { 95 return tpm_response_proto.response(); 96 } else { 97 LOG(ERROR) << "TrunksProxy could not parse response: " 98 << error->GetMessage(); 99 return CreateErrorResponse(SAPI_RC_MALFORMED_RESPONSE); 100 } 101 } 102 103 } // namespace trunks 104
