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// Copyright 2014 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_NATIVE_MESSAGING_PIPE_MESSAGING_CHANNEL_H_
#define REMOTING_HOST_NATIVE_MESSAGING_PIPE_MESSAGING_CHANNEL_H_
#include <memory>
#include "base/files/file.h"
#include "base/functional/callback.h"
#include "base/memory/raw_ptr.h"
#include "base/memory/weak_ptr.h"
#include "base/sequence_checker.h"
#include "base/values.h"
#include "extensions/browser/api/messaging/native_messaging_channel.h"
#include "remoting/host/native_messaging/native_messaging_reader.h"
#include "remoting/host/native_messaging/native_messaging_writer.h"
namespace remoting {
// An implementation of extensions::NativeMessagingChannel using a pipe. It
// is used by the It2MeNativeMessagingHost and Me2MeNativeMessagingHost to
// communicate with the chrome process.
// TODO(kelvinp): Move this class to the extensions/browser/api/messaging
// directory.
class PipeMessagingChannel : public extensions::NativeMessagingChannel {
public:
typedef extensions::NativeMessagingChannel::EventHandler EventHandler;
// Constructs an object taking the ownership of |input| and |output|.
PipeMessagingChannel(base::File input, base::File output);
PipeMessagingChannel(const PipeMessagingChannel&) = delete;
PipeMessagingChannel& operator=(const PipeMessagingChannel&) = delete;
~PipeMessagingChannel() override;
#if BUILDFLAG(IS_POSIX)
// Opens `stdin_file` and `stdout_file` with stdin and stdout respectively,
// which will NOT be assigned file descriptors 0 (STDIN_FILENO) and 1
// (STDOUT_FILENO), then points file descriptors 0 and 1 to /dev/null, so that
// child processes can't inherit stdin and stdout from this process and
// potentially corrupt the native messaging stream.
static void OpenAndBlockStdio(base::File& stdin_file,
base::File& stdout_file);
#endif // BUILDFLAG(IS_POSIX)
// extensions::NativeMessagingChannel implementation.
void Start(EventHandler* event_handler) override;
void SendMessage(std::optional<base::ValueView> message) override;
private:
// Processes a message received from the client app.
void ProcessMessage(base::Value message);
// Initiates shutdown.
void Shutdown();
NativeMessagingReader native_messaging_reader_;
std::unique_ptr<NativeMessagingWriter> native_messaging_writer_;
raw_ptr<EventHandler> event_handler_;
base::WeakPtr<PipeMessagingChannel> weak_ptr_;
SEQUENCE_CHECKER(sequence_checker_);
base::WeakPtrFactory<PipeMessagingChannel> weak_factory_{this};
};
} // namespace remoting
#endif // REMOTING_HOST_NATIVE_MESSAGING_PIPE_MESSAGING_CHANNEL_H_
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