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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.
#ifndef REMOTING_HOST_SECURITY_KEY_SECURITY_KEY_SOCKET_H_
#define REMOTING_HOST_SECURITY_KEY_SECURITY_KEY_SOCKET_H_
#include <stddef.h>
#include <memory>
#include <string>
#include <vector>
#include "base/functional/callback.h"
#include "base/memory/scoped_refptr.h"
#include "base/threading/thread_checker.h"
namespace base {
class OneShotTimer;
class TimeDelta;
} // namespace base
namespace net {
class DrainableIOBuffer;
class IOBufferWithSize;
class StreamSocket;
} // namespace net
namespace remoting {
// Class that manages reading requests and sending responses. The socket can
// only handle receiving one request at a time. It expects to receive no extra
// bytes over the wire, which is checked by IsRequestTooLarge method.
class SecurityKeySocket {
public:
SecurityKeySocket(std::unique_ptr<net::StreamSocket> socket,
base::TimeDelta timeout,
base::OnceClosure timeout_callback);
SecurityKeySocket(const SecurityKeySocket&) = delete;
SecurityKeySocket& operator=(const SecurityKeySocket&) = delete;
~SecurityKeySocket();
// Returns false if the request has not yet completed, or is too large to be
// processed. Otherwise, the cached request data is copied into |data_out| and
// the internal buffer resets and is ready for the next request.
bool GetAndClearRequestData(std::string* data_out);
// Sends response data to the socket.
void SendResponse(const std::string& data);
// Sends an SSH error code to the socket.
void SendSshError();
// |request_received_callback| is used to notify the caller that request data
// has been fully read, and caller is to use GetAndClearRequestData method to
// get the request data.
void StartReadingRequest(base::OnceClosure request_received_callback);
bool socket_read_error() const { return socket_read_error_; }
private:
// Called when bytes are written to |socket_|.
void OnDataWritten(int result);
// Continues writing to |socket_| if needed.
void DoWrite();
// Called when bytes are read from |socket_|.
void OnDataRead(int bytes_read);
// Continues to read.
void DoRead();
// Returns true if the current request is complete.
bool IsRequestComplete() const;
// Returns true if the stated request size is larger than the allowed maximum.
bool IsRequestTooLarge() const;
// Returns the stated request length.
size_t GetRequestLength() const;
// Returns the response length bytes.
std::string GetResponseLengthAsBytes(const std::string& response) const;
// Resets the socket activity timer.
void ResetTimer();
// Ensures SecurityKeySocketSocket methods are called on the same thread.
base::ThreadChecker thread_checker_;
// The socket.
std::unique_ptr<net::StreamSocket> socket_;
// Invoked when request data has been read.
base::OnceClosure request_received_callback_;
// Indicates whether the socket is being used to wait for a request.
bool waiting_for_request_ = false;
// Indicates whether an error was encountered while reading from the socket.
bool socket_read_error_ = false;
// Request data.
std::vector<char> request_data_;
scoped_refptr<net::DrainableIOBuffer> write_buffer_;
scoped_refptr<net::IOBufferWithSize> read_buffer_;
// The activity timer.
std::unique_ptr<base::OneShotTimer> timer_;
};
} // namespace remoting
#endif // REMOTING_HOST_SECURITY_KEY_SECURITY_KEY_SOCKET_H_
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