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
27namespace {
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.
33const int kDBusMaxTimeout = 5 * 60 * 1000;
34
35}  // namespace
36
37namespace trunks {
38
39TrunksDBusProxy::TrunksDBusProxy() : weak_factory_(this) {}
40
41TrunksDBusProxy::~TrunksDBusProxy() {
42  if (bus_) {
43    bus_->ShutdownAndBlock();
44  }
45}
46
47bool 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
58void 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
84std::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