/*
 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) 2013-2017 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.
*/

#include <fstream>
#include <stdio.h>
#include <unistd.h>
#include <sys/param.h>
#include <sys/ucred.h>
#include <sys/mount.h>
#include <sys/sysctl.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <sys/stat.h>
#include "CoreMacOSX.h"
#include "Driver/Fuse/FuseService.h"
#include "Core/Unix/CoreServiceProxy.h"

namespace VeraCrypt
{
	CoreMacOSX::CoreMacOSX ()
	{
	}

	CoreMacOSX::~CoreMacOSX ()
	{
	}

	shared_ptr <VolumeInfo> CoreMacOSX::DismountVolume (shared_ptr <VolumeInfo> mountedVolume, bool ignoreOpenFiles, bool syncVolumeInfo)
	{
		if (!mountedVolume->VirtualDevice.IsEmpty() && mountedVolume->VirtualDevice.IsBlockDevice())
		{
			list <string> args;
			args.push_back ("detach");
			args.push_back (mountedVolume->VirtualDevice);

			if (ignoreOpenFiles)
				args.push_back ("-force");

			try
			{
				Process::Execute ("hdiutil", args);
			}
			catch (ExecutedProcessFailed &e)
			{
				if (!ignoreOpenFiles)
				{
					string err = e.GetErrorOutput();

					if (err.find ("couldn't unmount") != string::npos
						|| err.find ("busy") != string::npos
						|| err.find ("49153") != string::npos)
					{
						throw MountedVolumeInUse (SRC_POS);
					}
				}

				throw;
			}
		}

		if (syncVolumeInfo || mountedVolume->Protection == VolumeProtection::HiddenVolumeReadOnly)
		{
			sync();
			VolumeInfoList ml = GetMountedVolumes (mountedVolume->Path);

			if (ml.size() > 0)
				mountedVolume = ml.front();
		}

		list <string> args;
		args.push_back ("--");
		args.push_back (mountedVolume->AuxMountPoint);

		for (int t = 0; true; t++)
		{
			try
			{
				Process::Execute ("umount", args);
				break;
			}
			catch (ExecutedProcessFailed&)
			{
				if (t > 10)
					throw;
				Thread::Sleep (200);
			}
		}

		try
		{
			mountedVolume->AuxMountPoint.Delete();
		}
		catch (...)	{ }

		return mountedVolume;
	}

	void CoreMacOSX::CheckFilesystem (shared_ptr <VolumeInfo> mountedVolume, bool repair) const
	{
		list <string> args;
		args.push_back ("/Applications/Utilities/Disk Utility.app");
		Process::Execute ("open", args);
	}

	void CoreMacOSX::MountAuxVolumeImage (const DirectoryPath &auxMountPoint, const MountOptions &options) const
	{
		// Check FUSE version
		char fuseVersionString[MAXHOSTNAMELEN + 1] = { 0 };
		size_t fuseVersionStringLength = MAXHOSTNAMELEN;
		int status;

		if ((status = sysctlbyname ("osxfuse.version.number", fuseVersionString, &fuseVersionStringLength, NULL, 0)) != 0)
		{
			fuseVersionStringLength = MAXHOSTNAMELEN;
			if ((status = sysctlbyname ("vfs.generic.osxfuse.version.number", fuseVersionString, &fuseVersionStringLength, NULL, 0)) != 0)
			{
				fuseVersionStringLength = MAXHOSTNAMELEN;
				if ((status = sysctlbyname ("vfs.generic.macfuse.version.number", fuseVersionString, &fuseVersionStringLength, NULL, 0)) != 0)
				{
					throw HigherFuseVersionRequired (SRC_POS);
				}
			}
		}

		// look for OSXFuse dynamic library
		struct stat sb;
		if (0 != stat("/usr/local/lib/libosxfuse_i64.2.dylib", &sb) && 0 != stat("/usr/local/lib/libfuse.dylib", &sb))
		{
			throw HigherFuseVersionRequired (SRC_POS);
		}

		vector <string> fuseVersion = StringConverter::Split (string (fuseVersionString), ".");
		if (fuseVersion.size() < 2)
			throw HigherFuseVersionRequired (SRC_POS);

		uint32 fuseVersionMajor = StringConverter::ToUInt32 (fuseVersion[0]);
		uint32 fuseVersionMinor = StringConverter::ToUInt32 (fuseVersion[1]);

		if (fuseVersionMajor < 2 || (fuseVersionMajor == 2 && fuseVersionMinor < 5))
			throw HigherFuseVersionRequired (SRC_POS);

		// Mount volume image
		string volImage = string (auxMountPoint) + FuseService::GetVolumeImagePath();

		list <string> args;
		args.push_back ("attach");
		args.push_back (volImage);
		args.push_back ("-plist");
		args.push_back ("-noautofsck");
		args.push_back ("-imagekey");
		args.push_back ("diskimage-class=CRawDiskImage");

		if (!options.NoFilesystem && options.MountPoint && !options.MountPoint->IsEmpty())
		{
			args.push_back ("-mount");
			args.push_back ("required");

			// Let the system specify mount point except when the user specified a non-default one
			if (string (*options.MountPoint).find (GetDefaultMountPointPrefix()) != 0)
			{
				args.push_back ("-mountpoint");
				args.push_back (*options.MountPoint);
			}
		}
		else
			args.push_back ("-nomount");

		if (options.Protection == VolumeProtection::ReadOnly)
			args.push_back ("-readonly");

		string xml;

		while (true)
		{
			try
			{
				xml = Process::Execute ("hdiutil", args);
				break;
			}
			catch (ExecutedProcessFailed &e)
			{
				if (e.GetErrorOutput().find ("noautofsck") != string::npos)
				{
					args.remove ("-noautofsck");
					continue;
				}

				throw;
			}
		}

		size_t p = xml.find ("<key>dev-entry</key>");
		if (p == string::npos)
			throw ParameterIncorrect (SRC_POS);

		p = xml.find ("<string>", p);
		if (p == string::npos)
			throw ParameterIncorrect (SRC_POS);
		p += 8;

		size_t e = xml.find ("</string>", p);
		if (e == string::npos)
			throw ParameterIncorrect (SRC_POS);

		DevicePath virtualDev = StringConverter::Trim (xml.substr (p, e - p));

		try
		{
			FuseService::SendAuxDeviceInfo (auxMountPoint, virtualDev);
		}
		catch (...)
		{
			try
			{
				list <string> args;
				args.push_back ("detach");
				args.push_back (volImage);
				args.push_back ("-force");

				Process::Execute ("hdiutil", args);
			}
			catch (ExecutedProcessFailed&) { }
			throw;
		}
	}

	unique_ptr <CoreBase> Core (new CoreServiceProxy <CoreMacOSX>);
	unique_ptr <CoreBase> CoreDirect (new CoreMacOSX);
}