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, 53 dbus::ObjectPath(trunks::kTrunksServicePath)); 54 origin_thread_id_ = base::PlatformThread::CurrentId(); 55 return (object_proxy_ != nullptr); 56 } 57 58 void TrunksDBusProxy::SendCommand(const std::string& command, 59 const ResponseCallback& callback) { 60 if (origin_thread_id_ != base::PlatformThread::CurrentId()) { 61 LOG(ERROR) << "Error TrunksDBusProxy cannot be shared by multiple threads."; 62 callback.Run(CreateErrorResponse(TRUNKS_RC_IPC_ERROR)); 63 } 64 SendCommandRequest tpm_command_proto; 65 tpm_command_proto.set_command(command); 66 auto on_success = [callback](const SendCommandResponse& response) { 67 callback.Run(response.response()); 68 }; 69 auto on_error = [callback](brillo::Error* error) { 70 SendCommandResponse response; 71 response.set_response(CreateErrorResponse(SAPI_RC_NO_RESPONSE_RECEIVED)); 72 callback.Run(response.response()); 73 }; 74 brillo::dbus_utils::CallMethodWithTimeout( 75 kDBusMaxTimeout, 76 object_proxy_, 77 trunks::kTrunksInterface, 78 trunks::kSendCommand, 79 base::Bind(on_success), 80 base::Bind(on_error), 81 tpm_command_proto); 82 } 83 84 std::string TrunksDBusProxy::SendCommandAndWait(const std::string& command) { 85 if (origin_thread_id_ != base::PlatformThread::CurrentId()) { 86 LOG(ERROR) << "Error TrunksDBusProxy cannot be shared by multiple threads."; 87 return CreateErrorResponse(TRUNKS_RC_IPC_ERROR); 88 } 89 SendCommandRequest tpm_command_proto; 90 tpm_command_proto.set_command(command); 91 brillo::ErrorPtr error; 92 std::unique_ptr<dbus::Response> dbus_response = 93 brillo::dbus_utils::CallMethodAndBlockWithTimeout( 94 kDBusMaxTimeout, 95 object_proxy_, 96 trunks::kTrunksInterface, 97 trunks::kSendCommand, 98 &error, 99 tpm_command_proto); 100 SendCommandResponse tpm_response_proto; 101 if (dbus_response.get() && brillo::dbus_utils::ExtractMethodCallResults( 102 dbus_response.get(), &error, &tpm_response_proto)) { 103 return tpm_response_proto.response(); 104 } else { 105 LOG(ERROR) << "TrunksProxy could not parse response: " 106 << error->GetMessage(); 107 return CreateErrorResponse(SAPI_RC_MALFORMED_RESPONSE); 108 } 109 } 110 111 112 } // namespace trunks 113
