/*
 Derived from source code of TrueCrypt 7.1a, which is
 Copyright (c) 2008-2012 TrueCrypt Developers Association and which is governed
 by the TrueCrypt License 3.0.

 Modifications and additions to the original source code (contained in this file)
 and all other portions of this file are Copyright (c) 2013-2016 IDRIX
 and are governed by the Apache License 2.0 the full text of which is
 contained in the file License.txt included in VeraCrypt binary and source
 code distribution packages.
*/

#ifndef TC_HEADER_Core_Unix_CoreService
#define TC_HEADER_Core_Unix_CoreService

#include "CoreServiceRequest.h"
#include "Platform/Stream.h"
#include "Platform/Unix/Pipe.h"
#include "Core/Core.h"

namespace VeraCrypt
{
	// This service facilitates process forking and elevation of user privileges
	class CoreService
	{
	public:
		static void ProcessElevatedRequests ();
		static void ProcessRequests (int inputFD = -1, int outputFD = -1);
		static void RequestCheckFilesystem (shared_ptr <VolumeInfo> mountedVolume, bool repair);
		static void RequestDismountFilesystem (const DirectoryPath &mountPoint, bool force);
		static shared_ptr <VolumeInfo> RequestDismountVolume (shared_ptr <VolumeInfo> mountedVolume, bool ignoreOpenFiles = false, bool syncVolumeInfo = false);
		static uint32 RequestGetDeviceSectorSize (const DevicePath &devicePath);
		static uint64 RequestGetDeviceSize (const DevicePath &devicePath);
		static HostDeviceList RequestGetHostDevices (bool pathListOnly);
		static shared_ptr <VolumeInfo> RequestMountVolume (MountOptions &options);
		static void RequestSetFileOwner (const FilesystemPath &path, const UserId &owner);
		static void SetAdminPasswordCallback (shared_ptr <GetStringFunctor> functor) { AdminPasswordCallback = functor; }
		static void Start ();
		static void Stop ();

	protected:
		template <class T> static auto_ptr <T> GetResponse ();
		template <class T> static auto_ptr <T> SendRequest (CoreServiceRequest &request);
		static void StartElevated (const CoreServiceRequest &request);

		static shared_ptr <GetStringFunctor> AdminPasswordCallback;

		static auto_ptr <Pipe> AdminInputPipe;
		static auto_ptr <Pipe> AdminOutputPipe;

		static auto_ptr <Pipe> InputPipe;
		static auto_ptr <Pipe> OutputPipe;
		static shared_ptr <Stream> ServiceInputStream;
		static shared_ptr <Stream> ServiceOutputStream;

		static bool ElevatedPrivileges;
		static bool ElevatedServiceAvailable;
		static bool Running;

	private:
		CoreService ();
	};

#define TC_CORE_SERVICE_CMDLINE_OPTION "--core-service"
}

#endif // TC_HEADER_Core_Unix_CoreService