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//
// Copyright (C) 2014 The Android Open Source Project
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
#include "trunks/trunks_proxy.h"
#include <base/bind.h>
#include <brillo/bind_lambda.h>
#include <brillo/dbus/dbus_method_invoker.h>
#include "trunks/dbus_interface.h"
#include "trunks/dbus_interface.pb.h"
#include "trunks/error_codes.h"
namespace {
// Use a five minute timeout because some commands on some TPM hardware can take
// a very long time. If a few lengthy operations are already in the queue, a
// subsequent command needs to wait for all of them. Timeouts are always
// possible but under normal conditions 5 minutes seems to be plenty.
const int kDBusMaxTimeout = 5 * 60 * 1000;
} // namespace
namespace trunks {
TrunksProxy::TrunksProxy() : weak_factory_(this) {}
TrunksProxy::~TrunksProxy() {
if (bus_) {
bus_->ShutdownAndBlock();
}
}
bool TrunksProxy::Init() {
dbus::Bus::Options options;
options.bus_type = dbus::Bus::SYSTEM;
bus_ = new dbus::Bus(options);
object_proxy_ = bus_->GetObjectProxy(
trunks::kTrunksServiceName,
dbus::ObjectPath(trunks::kTrunksServicePath));
origin_thread_id_ = base::PlatformThread::CurrentId();
return (object_proxy_ != nullptr);
}
void TrunksProxy::SendCommand(const std::string& command,
const ResponseCallback& callback) {
if (origin_thread_id_ != base::PlatformThread::CurrentId()) {
LOG(ERROR) << "Error TrunksProxy cannot be shared by multiple threads.";
callback.Run(CreateErrorResponse(TRUNKS_RC_IPC_ERROR));
}
SendCommandRequest tpm_command_proto;
tpm_command_proto.set_command(command);
auto on_error = [callback](brillo::Error* error) {
SendCommandResponse response;
response.set_response(CreateErrorResponse(SAPI_RC_NO_RESPONSE_RECEIVED));
callback.Run(response.response());
};
brillo::dbus_utils::CallMethodWithTimeout(
kDBusMaxTimeout,
object_proxy_,
trunks::kTrunksInterface,
trunks::kSendCommand,
callback,
base::Bind(on_error),
tpm_command_proto);
}
std::string TrunksProxy::SendCommandAndWait(const std::string& command) {
if (origin_thread_id_ != base::PlatformThread::CurrentId()) {
LOG(ERROR) << "Error TrunksProxy cannot be shared by multiple threads.";
return CreateErrorResponse(TRUNKS_RC_IPC_ERROR);
}
SendCommandRequest tpm_command_proto;
tpm_command_proto.set_command(command);
brillo::ErrorPtr error;
std::unique_ptr<dbus::Response> dbus_response =
brillo::dbus_utils::CallMethodAndBlockWithTimeout(
kDBusMaxTimeout,
object_proxy_,
trunks::kTrunksInterface,
trunks::kSendCommand,
&error,
tpm_command_proto);
SendCommandResponse tpm_response_proto;
if (dbus_response.get() && brillo::dbus_utils::ExtractMethodCallResults(
dbus_response.get(), &error, &tpm_response_proto)) {
return tpm_response_proto.response();
} else {
LOG(ERROR) << "TrunksProxy could not parse response: "
<< error->GetMessage();
return CreateErrorResponse(SAPI_RC_MALFORMED_RESPONSE);
}
}
} // namespace trunks
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