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// Copyright 2016 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "remoting/host/security_key/security_key_message_reader_impl.h"
#include <cstdint>
#include <string>
#include <utility>
#include "base/compiler_specific.h"
#include "base/files/file.h"
#include "base/functional/bind.h"
#include "base/logging.h"
#include "base/message_loop/message_pump_type.h"
#include "base/task/single_thread_task_runner.h"
#include "remoting/host/security_key/security_key_message.h"
namespace remoting {
SecurityKeyMessageReaderImpl::SecurityKeyMessageReaderImpl(
base::File input_file)
: read_stream_(std::move(input_file)),
reader_thread_("SecurityKeyMessageReaderImpl") {
base::Thread::Options options;
options.message_pump_type = base::MessagePumpType::IO;
reader_thread_.StartWithOptions(std::move(options));
read_task_runner_ = reader_thread_.task_runner();
main_task_runner_ = base::SingleThreadTaskRunner::GetCurrentDefault();
}
SecurityKeyMessageReaderImpl::~SecurityKeyMessageReaderImpl() {
DCHECK(main_task_runner_->RunsTasksInCurrentSequence());
// In order to ensure the reader thread is stopped cleanly, we want to stop
// the thread before the task runners and weak pointers are invalidated.
reader_thread_.Stop();
}
void SecurityKeyMessageReaderImpl::Start(
const SecurityKeyMessageCallback& message_callback,
base::OnceClosure error_callback) {
DCHECK(main_task_runner_->RunsTasksInCurrentSequence());
message_callback_ = message_callback;
error_callback_ = std::move(error_callback);
// base::Unretained is safe since this class owns the thread running this task
// which will be destroyed before this instance is.
read_task_runner_->PostTask(
FROM_HERE, base::BindOnce(&SecurityKeyMessageReaderImpl::ReadMessage,
base::Unretained(this)));
}
void SecurityKeyMessageReaderImpl::ReadMessage() {
DCHECK(read_task_runner_->RunsTasksInCurrentSequence());
while (true) {
if (!read_stream_.IsValid()) {
LOG(ERROR) << "Cannot read from invalid stream.";
NotifyError();
return;
}
uint32_t message_length_bytes = 0;
if (!ReadFromStream(reinterpret_cast<char*>(&message_length_bytes), 4)) {
NotifyError();
return;
}
if (!SecurityKeyMessage::IsValidMessageSize(message_length_bytes)) {
LOG(ERROR) << "Message size is invalid: " << message_length_bytes;
NotifyError();
return;
}
std::string message_data(message_length_bytes, '\0');
if (!ReadFromStream(std::data(message_data), message_data.size())) {
NotifyError();
return;
}
std::unique_ptr<SecurityKeyMessage> message(new SecurityKeyMessage());
if (!message->ParseMessage(message_data)) {
LOG(ERROR) << "Invalid message data received.";
NotifyError();
return;
}
// Notify callback of the new message received.
main_task_runner_->PostTask(
FROM_HERE,
base::BindOnce(&SecurityKeyMessageReaderImpl::InvokeMessageCallback,
weak_factory_.GetWeakPtr(), std::move(message)));
}
}
bool SecurityKeyMessageReaderImpl::ReadFromStream(char* buffer,
size_t bytes_to_read) {
DCHECK(buffer);
DCHECK_GT(bytes_to_read, 0u);
base::span<uint8_t> buffer_span =
base::as_writable_bytes(UNSAFE_TODO(base::span(buffer, bytes_to_read)));
do {
std::optional<size_t> read_result =
read_stream_.ReadAtCurrentPosNoBestEffort(buffer_span);
if (!read_result.has_value()) {
LOG(ERROR) << "Failed to read from stream, ReadAtCurrentPos failed";
return false;
}
if (*read_result == 0) {
// 0 means EOF which is normal and should not be logged as an error.
return false;
}
buffer_span = buffer_span.subspan(*read_result);
} while (!buffer_span.empty());
return true;
}
void SecurityKeyMessageReaderImpl::NotifyError() {
DCHECK(read_task_runner_->RunsTasksInCurrentSequence());
main_task_runner_->PostTask(
FROM_HERE,
base::BindOnce(&SecurityKeyMessageReaderImpl::InvokeErrorCallback,
weak_factory_.GetWeakPtr()));
}
void SecurityKeyMessageReaderImpl::InvokeMessageCallback(
std::unique_ptr<SecurityKeyMessage> message) {
DCHECK(main_task_runner_->RunsTasksInCurrentSequence());
message_callback_.Run(std::move(message));
}
void SecurityKeyMessageReaderImpl::InvokeErrorCallback() {
DCHECK(main_task_runner_->RunsTasksInCurrentSequence());
std::move(error_callback_).Run();
}
} // namespace remoting
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