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/*
* Copyright 2020, 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.
*/
#pragma once
#include <android-base/logging.h>
#include <errno.h>
#include <poll.h>
#include <stdio.h>
#include <sys/eventfd.h>
#include <sys/stat.h>
#include <teeui/msg_formatting.h>
#include <trusty/tipc.h>
#include <unistd.h>
#include <fstream>
#include <functional>
#include <future>
#include <iostream>
#include <sstream>
#include <thread>
#include <vector>
#define AT __FILE__ ":" << __LINE__ << ": "
namespace android {
namespace trusty {
using ::teeui::Message;
using ::teeui::msg2tuple_t;
using ::teeui::ReadStream;
using ::teeui::WriteStream;
#ifndef TEEUI_USE_STD_VECTOR
/*
* TEEUI_USE_STD_VECTOR makes certain wire types like teeui::MsgString and
* teeui::MsgVector be aliases for std::vector. This is required for thread safe
* message serialization. Always compile this with -DTEEUI_USE_STD_VECTOR set in
* CFLAGS of the HAL service.
*/
#error "Must be compiled with -DTEEUI_USE_STD_VECTOR."
#endif
enum class TrustyAppError : int32_t {
OK,
ERROR = -1,
MSG_TOO_LONG = -2,
};
/*
* There is a hard limitation of 0x1800 bytes for the to-be-signed message size. The protocol
* overhead is limited, so that 0x2000 is a buffer size that will be sufficient in any benign
* mode of operation.
*/
static constexpr const size_t kSendBufferSize = 0x2000;
ssize_t TrustyRpc(int handle, const uint8_t* obegin, const uint8_t* oend, uint8_t* ibegin,
uint8_t* iend);
class TrustyApp {
private:
int handle_;
static constexpr const int kInvalidHandle = -1;
/*
* This mutex serializes communication with the trusted app, not handle_.
* Calling issueCmd during construction or deletion is undefined behavior.
*/
std::mutex mutex_;
public:
TrustyApp(const std::string& path, const std::string& appname);
~TrustyApp();
template <typename Request, typename Response, typename... T>
std::tuple<TrustyAppError, msg2tuple_t<Response>> issueCmd(const T&... args) {
std::lock_guard<std::mutex> lock(mutex_);
if (handle_ == kInvalidHandle) {
LOG(ERROR) << "TrustyApp not connected";
return {TrustyAppError::ERROR, {}};
}
uint8_t buffer[kSendBufferSize];
WriteStream out(buffer);
out = write(Request(), out, args...);
if (!out) {
LOG(ERROR) << AT << "send command failed: message formatting";
return {TrustyAppError::MSG_TOO_LONG, {}};
}
auto rc = TrustyRpc(handle_, &buffer[0], const_cast<const uint8_t*>(out.pos()), &buffer[0],
&buffer[kSendBufferSize]);
if (rc < 0) return {TrustyAppError::ERROR, {}};
ReadStream in(&buffer[0], rc);
auto result = read(Response(), in);
if (!std::get<0>(result)) {
LOG(ERROR) << "send command failed: message parsing";
return {TrustyAppError::ERROR, {}};
}
return {std::get<0>(result) ? TrustyAppError::OK : TrustyAppError::ERROR,
tuple_tail(std::move(result))};
}
template <typename Request, typename... T> TrustyAppError issueCmd(const T&... args) {
std::lock_guard<std::mutex> lock(mutex_);
if (handle_ == kInvalidHandle) {
LOG(ERROR) << "TrustyApp not connected";
return TrustyAppError::ERROR;
}
uint8_t buffer[kSendBufferSize];
WriteStream out(buffer);
out = write(Request(), out, args...);
if (!out) {
LOG(ERROR) << AT << "send command failed: message formatting";
return TrustyAppError::MSG_TOO_LONG;
}
auto rc = TrustyRpc(handle_, &buffer[0], const_cast<const uint8_t*>(out.pos()), &buffer[0],
&buffer[kSendBufferSize]);
if (rc < 0) {
LOG(ERROR) << "send command failed: " << strerror(errno) << " (" << errno << ")";
return TrustyAppError::ERROR;
}
if (rc > 0) {
LOG(ERROR) << "Unexpected non zero length response";
return TrustyAppError::ERROR;
}
return TrustyAppError::OK;
}
operator bool() const { return handle_ != kInvalidHandle; }
};
} // namespace trusty
} // namespace android
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