/*
 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/wait.h>
#include "CoreFreeBSD.h"
#include "Core/Unix/CoreServiceProxy.h"

namespace VeraCrypt
{
	CoreFreeBSD::CoreFreeBSD ()
	{
	}

	CoreFreeBSD::~CoreFreeBSD ()
	{
	}

	DevicePath CoreFreeBSD::AttachFileToLoopDevice (const FilePath &filePath, bool readOnly) const
	{
		list <string> args;
		args.push_back ("-a");
		args.push_back ("-t");
		args.push_back ("vnode");

		if (readOnly)
		{
			args.push_back ("-o");
			args.push_back ("readonly");
		}

		args.push_back ("-f");
		args.push_back (filePath);

		string dev = StringConverter::Trim (Process::Execute ("mdconfig", args));

		if (dev.find ("/") == string::npos)
			dev = string ("/dev/") + dev;

		return dev;
	}

	void CoreFreeBSD::DetachLoopDevice (const DevicePath &devicePath) const
	{
		list <string> args;
		args.push_back ("-d");
		args.push_back ("-u");
		args.push_back (StringConverter::GetTrailingNumber (devicePath));

		for (int t = 0; true; t++)
		{
			try
			{
				Process::Execute ("mdconfig", args);
				break;
			}
			catch (ExecutedProcessFailed&)
			{
				if (t > 5)
					throw;
				Thread::Sleep (200);
			}
		}
	}

	HostDeviceList CoreFreeBSD::GetHostDevices (bool pathListOnly) const
	{
		HostDeviceList devices;
#ifdef TC_MACOSX
		const string busType = "rdisk";
#else
		foreach (const string &busType, StringConverter::Split ("ad da vtbd"))
#endif
		{
			for (int devNumber = 0; devNumber < 64; devNumber++)
			{
				stringstream devPath;
				devPath << "/dev/" << busType << devNumber;

				if (FilesystemPath (devPath.str()).IsBlockDevice() || FilesystemPath (devPath.str()).IsCharacterDevice())
				{
					make_shared_auto (HostDevice, device);
					device->Path = devPath.str();
					if (!pathListOnly)
					{
						try
						{
							device->Size = GetDeviceSize (device->Path);
						}
						catch (...)
						{
							device->Size = 0;
						}
						device->MountPoint = GetDeviceMountPoint (device->Path);
						device->SystemNumber = 0;
					}
					devices.push_back (device);

					for (int partNumber = 1; partNumber < 32; partNumber++)
					{
#ifdef TC_MACOSX
						const string partLetter = "";
#else
						foreach (const string &partLetter, StringConverter::Split (",a,b,c,d,e,f,g,h", ",", true))
#endif
						{
							stringstream partPath;
							partPath << devPath.str() << "s" << partNumber << partLetter;

							if (FilesystemPath (partPath.str()).IsBlockDevice() || FilesystemPath (partPath.str()).IsCharacterDevice())
							{
								make_shared_auto (HostDevice, partition);
								partition->Path = partPath.str();
								if (!pathListOnly)
								{
									try
									{
										partition->Size = GetDeviceSize (partition->Path);
									}
									catch (...)
									{
										partition->Size = 0;
									}
									partition->MountPoint = GetDeviceMountPoint (partition->Path);
									partition->SystemNumber = 0;
								}

								device->Partitions.push_back (partition);
							}
						}
					}
				}
			}
		}

		return devices;
	}

	MountedFilesystemList CoreFreeBSD::GetMountedFilesystems (const DevicePath &devicePath, const DirectoryPath &mountPoint) const
	{

		static Mutex mutex;
		ScopeLock sl (mutex);

		struct statfs *sysMountList;
		int count = getmntinfo (&sysMountList, MNT_NOWAIT);
		throw_sys_if (count == 0);

		MountedFilesystemList mountedFilesystems;

		for (int i = 0; i < count; i++)
		{
			make_shared_auto (MountedFilesystem, mf);

			if (sysMountList[i].f_mntfromname[0])
				mf->Device = DevicePath (sysMountList[i].f_mntfromname);
			else
				continue;

			if (sysMountList[i].f_mntonname[0])
				mf->MountPoint = DirectoryPath (sysMountList[i].f_mntonname);

			mf->Type = sysMountList[i].f_fstypename;

			if ((devicePath.IsEmpty() || devicePath == mf->Device) && (mountPoint.IsEmpty() || mountPoint == mf->MountPoint))
				mountedFilesystems.push_back (mf);
		}

		return mountedFilesystems;
	}

	void CoreFreeBSD::MountFilesystem (const DevicePath &devicePath, const DirectoryPath &mountPoint, const string &filesystemType, bool readOnly, const string &systemMountOptions) const
	{
		std::string chosenFilesystem = "msdos";
		std::string modifiedMountOptions = systemMountOptions;

		if (filesystemType.empty() && modifiedMountOptions.find("mountprog") == string::npos) {
			// No filesystem type specified through CLI, attempt to identify with blkid
			// as mount is unable to probe filesystem type on BSD
			// Make sure we don't override user defined mountprog
			std::vector<char> buffer(128,0);
			std::string cmd = "blkid -o value -s TYPE " + static_cast<std::string>(devicePath) + " 2>/dev/null";
			std::string result;

			FILE* pipe = popen(cmd.c_str(), "r");
			if (pipe) {
				while (!feof(pipe)) {
					if (fgets(buffer.data(), 128, pipe) != nullptr)
						result += buffer.data();
				}
				fflush(pipe);
				pclose(pipe);
				pipe = nullptr;
			}

			if (result.find("ext") == 0 || StringConverter::ToLower(filesystemType).find("ext") == 0) {
				chosenFilesystem = "ext2fs";
			}
			else if (result.find("exfat") == 0 || StringConverter::ToLower(filesystemType) == "exfat") {
				chosenFilesystem = "exfat";
				modifiedMountOptions += string(!systemMountOptions.empty() ? "," : "")
							+ "mountprog=/usr/local/sbin/mount.exfat";
			}
			else if (result.find("ntfs") == 0 || StringConverter::ToLower(filesystemType) == "ntfs") {
				chosenFilesystem = "ntfs";
				modifiedMountOptions += string(!systemMountOptions.empty() ? "," : "")
							+ "mountprog=/usr/local/bin/ntfs-3g";
			}
			else if (!filesystemType.empty()) {
				// Filesystem is specified but is none of the above, then supply as is
				chosenFilesystem = filesystemType;
			}
		} else
			chosenFilesystem = filesystemType;

		try
		{
			CoreUnix::MountFilesystem (devicePath, mountPoint, chosenFilesystem, readOnly, modifiedMountOptions);
		}
		catch (ExecutedProcessFailed&)
		{
			if (!filesystemType.empty())
				throw;

			CoreUnix::MountFilesystem (devicePath, mountPoint, filesystemType, readOnly, systemMountOptions);
		}
	}

#ifdef TC_FREEBSD
	unique_ptr <CoreBase> Core (new CoreServiceProxy <CoreFreeBSD>);
	unique_ptr <CoreBase> CoreDirect (new CoreFreeBSD);
#endif
}