// /***************************************************************************
// Aaru Data Preservation Suite
// ----------------------------------------------------------------------------
//
// Filename       : Remote.cs
// Author(s)      : Natalia Portillo <claunia@claunia.com>
//
// Component      : Aaru Remote.
//
// --[ Description ] ----------------------------------------------------------
//
//     Implementation of the Aaru Remote protocol.
//
// --[ License ] --------------------------------------------------------------
//
//     This library is free software; you can redistribute it and/or modify
//     it under the terms of the GNU Lesser General Public License as
//     published by the Free Software Foundation; either version 2.1 of the
//     License, or (at your option) any later version.
//
//     This library is distributed in the hope that it will be useful, but
//     WITHOUT ANY WARRANTY; without even the implied warranty of
//     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
//     Lesser General Public License for more details.
//
//     You should have received a copy of the GNU Lesser General Public
//     License along with this library; if not, see <http://www.gnu.org/licenses/>.
//
// ----------------------------------------------------------------------------
// Copyright © 2011-2022 Natalia Portillo
// ****************************************************************************/

// ReSharper disable MemberCanBeInternal

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Net;
using System.Net.Sockets;
using System.Runtime.InteropServices;
using Aaru.CommonTypes.Enums;
using Aaru.CommonTypes.Interop;
using Aaru.Console;
using Aaru.Decoders.ATA;
using Marshal = Aaru.Helpers.Marshal;
using Version = Aaru.CommonTypes.Interop.Version;

namespace Aaru.Devices.Remote;

/// <inheritdoc />
/// <summary>Handles communication with a remote device that's connected using the AaruRemote protocol</summary>
public class Remote : IDisposable
{
    readonly string _host;
    readonly Socket _socket;

    /// <summary>Connects using TCP/IP to the specified remote</summary>
    /// <param name="uri">URI of the remote</param>
    /// <exception cref="ArgumentException">Unsupported or invalid remote protocol.</exception>
    /// <exception cref="SocketException">Host not found.</exception>
    /// <exception cref="IOException">Network error.</exception>
    public Remote(Uri uri)
    {
        if(uri.Scheme != "aaru" &&
           uri.Scheme != "dic")
            throw new ArgumentException("Invalid remote protocol.", nameof(uri.Scheme));

        _host = uri.DnsSafeHost;

        if(!IPAddress.TryParse(_host, out IPAddress ipAddress))
        {
            IPHostEntry ipHostEntry = Dns.GetHostEntry(_host);

            ipAddress = ipHostEntry.AddressList.FirstOrDefault(a => a.AddressFamily == AddressFamily.InterNetwork);
        }

        if(ipAddress is null)
        {
            AaruConsole.ErrorWriteLine("Host not found");

            throw new SocketException(11001);
        }

        var ipEndPoint = new IPEndPoint(ipAddress, uri.Port > 0 ? uri.Port : 6666);
        _socket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);

        _socket.Connect(ipEndPoint);

        AaruConsole.WriteLine("Connected to {0}", uri.Host);

        byte[] hdrBuf = new byte[Marshal.SizeOf<AaruPacketHeader>()];

        int len = Receive(_socket, hdrBuf, hdrBuf.Length, SocketFlags.Peek);

        if(len < hdrBuf.Length)
        {
            AaruConsole.ErrorWriteLine("Could not read from the network...");

            throw new IOException();
        }

        AaruPacketHeader hdr = Marshal.ByteArrayToStructureLittleEndian<AaruPacketHeader>(hdrBuf);

        if(hdr.remote_id != Consts.REMOTE_ID ||
           hdr.packet_id != Consts.PACKET_ID)
        {
            AaruConsole.ErrorWriteLine("Received data is not an Aaru Remote Packet...");

            throw new ArgumentException();
        }

        byte[] buf;

        if(hdr.packetType != AaruPacketType.Hello)
        {
            if(hdr.packetType != AaruPacketType.Nop)
            {
                AaruConsole.ErrorWriteLine("Expected Hello Packet, got packet type {0}...", hdr.packetType);

                throw new ArgumentException();
            }

            buf = new byte[hdr.len];
            len = Receive(_socket, buf, buf.Length, SocketFlags.None);

            if(len < buf.Length)
            {
                AaruConsole.ErrorWriteLine("Could not read from the network...");

                throw new IOException();
            }

            AaruPacketNop nop = Marshal.ByteArrayToStructureLittleEndian<AaruPacketNop>(buf);

            AaruConsole.ErrorWriteLine($"{nop.reason}");

            throw new ArgumentException();
        }

        if(hdr.version != Consts.PACKET_VERSION)
        {
            AaruConsole.ErrorWriteLine("Unrecognized packet version...");

            throw new ArgumentException();
        }

        buf = new byte[hdr.len];
        len = Receive(_socket, buf, buf.Length, SocketFlags.None);

        if(len < buf.Length)
        {
            AaruConsole.ErrorWriteLine("Could not read from the network...");

            throw new IOException();
        }

        AaruPacketHello serverHello = Marshal.ByteArrayToStructureLittleEndian<AaruPacketHello>(buf);

        ServerApplication            = serverHello.application;
        ServerVersion                = serverHello.version;
        ServerOperatingSystem        = serverHello.sysname;
        ServerOperatingSystemVersion = serverHello.release;
        ServerArchitecture           = serverHello.machine;
        ServerProtocolVersion        = serverHello.maxProtocol;

        var clientHello = new AaruPacketHello
        {
            application = "Aaru",
            version     = Version.GetVersion(),
            maxProtocol = Consts.MAX_PROTOCOL,
            sysname     = DetectOS.GetPlatformName(DetectOS.GetRealPlatformID(), DetectOS.GetVersion()),
            release     = DetectOS.GetVersion(),
            machine     = RuntimeInformation.ProcessArchitecture.ToString(),
            hdr = new AaruPacketHeader
            {
                remote_id  = Consts.REMOTE_ID,
                packet_id  = Consts.PACKET_ID,
                len        = (uint)Marshal.SizeOf<AaruPacketHello>(),
                version    = Consts.PACKET_VERSION,
                packetType = AaruPacketType.Hello
            }
        };

        buf = Marshal.StructureToByteArrayLittleEndian(clientHello);

        len = _socket.Send(buf, SocketFlags.None);

        if(len >= buf.Length)
            return;

        AaruConsole.ErrorWriteLine("Could not write to the network...");

        throw new IOException();
    }

    /// <summary>Remote server application</summary>
    public string ServerApplication { get; }
    /// <summary>Remote server application version</summary>
    public string ServerVersion { get; }
    /// <summary>Remote server operating system</summary>
    public string ServerOperatingSystem { get; }
    /// <summary>Remote server operating system version</summary>
    public string ServerOperatingSystemVersion { get; }
    /// <summary>Remote server architecture</summary>
    public string ServerArchitecture { get; }
    /// <summary>Remote server protocol version</summary>
    public int ServerProtocolVersion { get; }

    /// <summary>Is remote running with administrative (aka root) privileges?</summary>
    public bool IsRoot
    {
        get
        {
            var cmdPkt = new AaruPacketCmdAmIRoot
            {
                hdr = new AaruPacketHeader
                {
                    remote_id  = Consts.REMOTE_ID,
                    packet_id  = Consts.PACKET_ID,
                    len        = (uint)Marshal.SizeOf<AaruPacketCmdAmIRoot>(),
                    version    = Consts.PACKET_VERSION,
                    packetType = AaruPacketType.CommandAmIRoot
                }
            };

            byte[] buf = Marshal.StructureToByteArrayLittleEndian(cmdPkt);

            int len = _socket.Send(buf, SocketFlags.None);

            if(len != buf.Length)
            {
                AaruConsole.ErrorWriteLine("Could not write to the network...");

                return false;
            }

            byte[] hdrBuf = new byte[Marshal.SizeOf<AaruPacketHeader>()];

            len = Receive(_socket, hdrBuf, hdrBuf.Length, SocketFlags.Peek);

            if(len < hdrBuf.Length)
            {
                AaruConsole.ErrorWriteLine("Could not read from the network...");

                return false;
            }

            AaruPacketHeader hdr = Marshal.ByteArrayToStructureLittleEndian<AaruPacketHeader>(hdrBuf);

            if(hdr.remote_id != Consts.REMOTE_ID ||
               hdr.packet_id != Consts.PACKET_ID)
            {
                AaruConsole.ErrorWriteLine("Received data is not an Aaru Remote Packet...");

                return false;
            }

            if(hdr.packetType != AaruPacketType.ResponseAmIRoot)
            {
                AaruConsole.ErrorWriteLine("Expected Am I Root? Response Packet, got packet type {0}...",
                                           hdr.packetType);

                return false;
            }

            buf = new byte[hdr.len];
            len = Receive(_socket, buf, buf.Length, SocketFlags.None);

            if(len < buf.Length)
            {
                AaruConsole.ErrorWriteLine("Could not read from the network...");

                return false;
            }

            AaruPacketResAmIRoot res = Marshal.ByteArrayToStructureLittleEndian<AaruPacketResAmIRoot>(buf);

            return res.am_i_root != 0;
        }
    }

    /// <inheritdoc />
    public void Dispose() => Disconnect();

    /// <summary>Disconnects from remote</summary>
    public void Disconnect()
    {
        try
        {
            _socket.Shutdown(SocketShutdown.Both);
            _socket.Close();
        }
        catch(ObjectDisposedException)
        {
            // Ignore if already disposed
        }
    }

    /// <summary>Lists devices attached to remote</summary>
    /// <returns>List of devices</returns>
    public DeviceInfo[] ListDevices()
    {
        var cmdPkt = new AaruPacketCommandListDevices
        {
            hdr = new AaruPacketHeader
            {
                remote_id  = Consts.REMOTE_ID,
                packet_id  = Consts.PACKET_ID,
                len        = (uint)Marshal.SizeOf<AaruPacketCommandListDevices>(),
                version    = Consts.PACKET_VERSION,
                packetType = AaruPacketType.CommandListDevices
            }
        };

        byte[] buf = Marshal.StructureToByteArrayLittleEndian(cmdPkt);

        int len = _socket.Send(buf, SocketFlags.None);

        if(len != buf.Length)
        {
            AaruConsole.ErrorWriteLine("Could not write to the network...");

            return Array.Empty<DeviceInfo>();
        }

        byte[] hdrBuf = new byte[Marshal.SizeOf<AaruPacketHeader>()];

        len = Receive(_socket, hdrBuf, hdrBuf.Length, SocketFlags.Peek);

        if(len < hdrBuf.Length)
        {
            AaruConsole.ErrorWriteLine("Could not read from the network...");

            return Array.Empty<DeviceInfo>();
        }

        AaruPacketHeader hdr = Marshal.ByteArrayToStructureLittleEndian<AaruPacketHeader>(hdrBuf);

        if(hdr.remote_id != Consts.REMOTE_ID ||
           hdr.packet_id != Consts.PACKET_ID)
        {
            AaruConsole.ErrorWriteLine("Received data is not an Aaru Remote Packet...");

            return Array.Empty<DeviceInfo>();
        }

        if(hdr.packetType != AaruPacketType.ResponseListDevices)
        {
            if(hdr.packetType != AaruPacketType.Nop)
            {
                AaruConsole.ErrorWriteLine("Expected List Devices Response Packet, got packet type {0}...",
                                           hdr.packetType);

                return Array.Empty<DeviceInfo>();
            }

            buf = new byte[hdr.len];
            len = Receive(_socket, buf, buf.Length, SocketFlags.None);

            if(len < buf.Length)
            {
                AaruConsole.ErrorWriteLine("Could not read from the network...");

                return Array.Empty<DeviceInfo>();
            }

            AaruPacketNop nop = Marshal.ByteArrayToStructureLittleEndian<AaruPacketNop>(buf);

            AaruConsole.ErrorWriteLine($"{nop.reason}");

            return Array.Empty<DeviceInfo>();
        }

        if(hdr.version != Consts.PACKET_VERSION)
        {
            AaruConsole.ErrorWriteLine("Unrecognized packet version...");

            return Array.Empty<DeviceInfo>();
        }

        buf = new byte[hdr.len];
        len = Receive(_socket, buf, buf.Length, SocketFlags.None);

        if(len < buf.Length)
        {
            AaruConsole.ErrorWriteLine("Could not read from the network...");

            return Array.Empty<DeviceInfo>();
        }

        AaruPacketResponseListDevices response =
            Marshal.ByteArrayToStructureLittleEndian<AaruPacketResponseListDevices>(buf);

        List<DeviceInfo> devices    = new List<DeviceInfo>();
        int              offset     = Marshal.SizeOf<AaruPacketResponseListDevices>();
        int              devInfoLen = Marshal.SizeOf<DeviceInfo>();

        for(ushort i = 0; i < response.devices; i++)
        {
            DeviceInfo dev = Marshal.ByteArrayToStructureLittleEndian<DeviceInfo>(buf, offset, devInfoLen);
            dev.Path = dev.Path[0] == '/' ? $"aaru://{_host}{dev.Path}" : $"aaru://{_host}/{dev.Path}";
            devices.Add(dev);
            offset += devInfoLen;
        }

        return devices.ToArray();
    }

    /// <summary>Opens the specified device path on the remote</summary>
    /// <param name="devicePath">Device path</param>
    /// <param name="lastError">Returned error</param>
    /// <returns><c>true</c> if opened correctly, <c>false</c>otherwise</returns>
    /// <exception cref="NotImplementedException">
    ///     Support for the specified device has not yet been implemented in the remote
    ///     application.
    /// </exception>
    public bool Open(string devicePath, out int lastError)
    {
        lastError = 0;

        var cmdPkt = new AaruPacketCommandOpenDevice
        {
            hdr = new AaruPacketHeader
            {
                remote_id  = Consts.REMOTE_ID,
                packet_id  = Consts.PACKET_ID,
                len        = (uint)Marshal.SizeOf<AaruPacketCommandOpenDevice>(),
                version    = Consts.PACKET_VERSION,
                packetType = AaruPacketType.CommandOpen
            },
            device_path = devicePath
        };

        byte[] buf = Marshal.StructureToByteArrayLittleEndian(cmdPkt);

        int len = _socket.Send(buf, SocketFlags.None);

        if(len != buf.Length)
        {
            AaruConsole.ErrorWriteLine("Could not write to the network...");
            lastError = -1;

            return false;
        }

        byte[] hdrBuf = new byte[Marshal.SizeOf<AaruPacketHeader>()];

        len = Receive(_socket, hdrBuf, hdrBuf.Length, SocketFlags.Peek);

        if(len < hdrBuf.Length)
        {
            AaruConsole.ErrorWriteLine("Could not read from the network...");
            lastError = -1;

            return false;
        }

        AaruPacketHeader hdr = Marshal.ByteArrayToStructureLittleEndian<AaruPacketHeader>(hdrBuf);

        if(hdr.remote_id != Consts.REMOTE_ID ||
           hdr.packet_id != Consts.PACKET_ID)
        {
            AaruConsole.ErrorWriteLine("Received data is not an Aaru Remote Packet...");
            lastError = -1;

            return false;
        }

        if(hdr.packetType != AaruPacketType.Nop)
        {
            AaruConsole.ErrorWriteLine("Expected List Devices Response Packet, got packet type {0}...", hdr.packetType);

            lastError = -1;

            return false;
        }

        buf = new byte[hdr.len];
        len = Receive(_socket, buf, buf.Length, SocketFlags.None);

        if(len < buf.Length)
        {
            AaruConsole.ErrorWriteLine("Could not read from the network...");
            lastError = -1;

            return false;
        }

        AaruPacketNop nop = Marshal.ByteArrayToStructureLittleEndian<AaruPacketNop>(buf);

        switch(nop.reasonCode)
        {
            case AaruNopReason.OpenOk:         return true;
            case AaruNopReason.NotImplemented: throw new NotImplementedException($"{nop.reason}");
        }

        AaruConsole.ErrorWriteLine($"{nop.reason}");
        lastError = nop.errno;

        return false;
    }

    /// <summary>Sends a SCSI command to the remote device</summary>
    /// <returns>0 if no error occurred, otherwise, errno</returns>
    /// <param name="cdb">SCSI CDB</param>
    /// <param name="buffer">Buffer for SCSI command response</param>
    /// <param name="senseBuffer">Buffer with the SCSI sense</param>
    /// <param name="timeout">Timeout in seconds</param>
    /// <param name="direction">SCSI command transfer direction</param>
    /// <param name="duration">Time it took to execute the command in milliseconds</param>
    /// <param name="sense">
    ///     <c>True</c> if SCSI command returned non-OK status and <paramref name="senseBuffer" /> contains
    ///     SCSI sense
    /// </param>
    public int SendScsiCommand(byte[] cdb, ref byte[] buffer, out byte[] senseBuffer, uint timeout,
                               ScsiDirection direction, out double duration, out bool sense)
    {
        senseBuffer = null;
        duration    = 0;
        sense       = true;

        var cmdPkt = new AaruPacketCmdScsi
        {
            hdr = new AaruPacketHeader
            {
                remote_id  = Consts.REMOTE_ID,
                packet_id  = Consts.PACKET_ID,
                version    = Consts.PACKET_VERSION,
                packetType = AaruPacketType.CommandScsi
            },
            direction = (int)direction,
            timeout   = timeout * 1000
        };

        if(cdb != null)
            cmdPkt.cdb_len = (uint)cdb.Length;

        if(buffer != null)
            cmdPkt.buf_len = (uint)buffer.Length;

        cmdPkt.hdr.len = (uint)(Marshal.SizeOf<AaruPacketCmdScsi>() + cmdPkt.cdb_len + cmdPkt.buf_len);

        byte[] pktBuf = Marshal.StructureToByteArrayLittleEndian(cmdPkt);
        byte[] buf    = new byte[cmdPkt.hdr.len];

        Array.Copy(pktBuf, 0, buf, 0, Marshal.SizeOf<AaruPacketCmdScsi>());

        if(cdb != null)
            Array.Copy(cdb, 0, buf, Marshal.SizeOf<AaruPacketCmdScsi>(), cmdPkt.cdb_len);

        if(buffer != null)
            Array.Copy(buffer, 0, buf, Marshal.SizeOf<AaruPacketCmdScsi>() + cmdPkt.cdb_len, cmdPkt.buf_len);

        int len = _socket.Send(buf, SocketFlags.None);

        if(len != buf.Length)
        {
            AaruConsole.ErrorWriteLine("Could not write to the network...");

            return -1;
        }

        byte[] hdrBuf = new byte[Marshal.SizeOf<AaruPacketHeader>()];

        len = Receive(_socket, hdrBuf, hdrBuf.Length, SocketFlags.Peek);

        if(len < hdrBuf.Length)
        {
            AaruConsole.ErrorWriteLine("Could not read from the network...");

            return -1;
        }

        AaruPacketHeader hdr = Marshal.ByteArrayToStructureLittleEndian<AaruPacketHeader>(hdrBuf);

        if(hdr.remote_id != Consts.REMOTE_ID ||
           hdr.packet_id != Consts.PACKET_ID)
        {
            AaruConsole.ErrorWriteLine("Received data is not an Aaru Remote Packet...");

            return -1;
        }

        if(hdr.packetType != AaruPacketType.ResponseScsi)
        {
            AaruConsole.ErrorWriteLine("Expected SCSI Response Packet, got packet type {0}...", hdr.packetType);

            return -1;
        }

        buf = new byte[hdr.len];
        len = Receive(_socket, buf, buf.Length, SocketFlags.None);

        if(len < buf.Length)
        {
            AaruConsole.ErrorWriteLine("Could not read from the network...");

            return -1;
        }

        AaruPacketResScsi res = Marshal.ByteArrayToStructureLittleEndian<AaruPacketResScsi>(buf);

        senseBuffer = new byte[res.sense_len];
        Array.Copy(buf, Marshal.SizeOf<AaruPacketResScsi>(), senseBuffer, 0, res.sense_len);
        buffer = new byte[res.buf_len];
        Array.Copy(buf, Marshal.SizeOf<AaruPacketResScsi>() + res.sense_len, buffer, 0, res.buf_len);
        duration = res.duration;
        sense    = res.sense != 0;

        return (int)res.error_no;
    }

    /// <summary>Sends an ATA/ATAPI command to the remote device using CHS addressing</summary>
    /// <returns>0 if no error occurred, otherwise, errno</returns>
    /// <param name="registers">ATA registers.</param>
    /// <param name="errorRegisters">Status/error registers.</param>
    /// <param name="protocol">ATA Protocol.</param>
    /// <param name="transferRegister">Indicates which register indicates the transfer length</param>
    /// <param name="buffer">Buffer for ATA/ATAPI command response</param>
    /// <param name="timeout">Timeout in seconds</param>
    /// <param name="transferBlocks">
    ///     If set to <c>true</c>, transfer is indicated in blocks, otherwise, it is indicated in
    ///     bytes.
    /// </param>
    /// <param name="duration">Time it took to execute the command in milliseconds</param>
    /// <param name="sense"><c>True</c> if ATA/ATAPI command returned non-OK status</param>
    public int SendAtaCommand(AtaRegistersChs registers, out AtaErrorRegistersChs errorRegisters, AtaProtocol protocol,
                              AtaTransferRegister transferRegister, ref byte[] buffer, uint timeout,
                              bool transferBlocks, out double duration, out bool sense)
    {
        duration       = 0;
        sense          = true;
        errorRegisters = new AtaErrorRegistersChs();

        var cmdPkt = new AaruPacketCmdAtaChs
        {
            hdr = new AaruPacketHeader
            {
                remote_id  = Consts.REMOTE_ID,
                packet_id  = Consts.PACKET_ID,
                version    = Consts.PACKET_VERSION,
                packetType = AaruPacketType.CommandAtaChs
            },
            registers        = registers,
            protocol         = (byte)protocol,
            transferRegister = (byte)transferRegister,
            transferBlocks   = transferBlocks,
            timeout          = timeout * 1000
        };

        if(buffer != null)
            cmdPkt.buf_len = (uint)buffer.Length;

        cmdPkt.hdr.len = (uint)(Marshal.SizeOf<AaruPacketCmdAtaChs>() + cmdPkt.buf_len);

        byte[] pktBuf = Marshal.StructureToByteArrayLittleEndian(cmdPkt);
        byte[] buf    = new byte[cmdPkt.hdr.len];

        Array.Copy(pktBuf, 0, buf, 0, Marshal.SizeOf<AaruPacketCmdAtaChs>());

        if(buffer != null)
            Array.Copy(buffer, 0, buf, Marshal.SizeOf<AaruPacketCmdAtaChs>(), cmdPkt.buf_len);

        int len = _socket.Send(buf, SocketFlags.None);

        if(len != buf.Length)
        {
            AaruConsole.ErrorWriteLine("Could not write to the network...");

            return -1;
        }

        byte[] hdrBuf = new byte[Marshal.SizeOf<AaruPacketHeader>()];

        len = Receive(_socket, hdrBuf, hdrBuf.Length, SocketFlags.Peek);

        if(len < hdrBuf.Length)
        {
            AaruConsole.ErrorWriteLine("Could not read from the network...");

            return -1;
        }

        AaruPacketHeader hdr = Marshal.ByteArrayToStructureLittleEndian<AaruPacketHeader>(hdrBuf);

        if(hdr.remote_id != Consts.REMOTE_ID ||
           hdr.packet_id != Consts.PACKET_ID)
        {
            AaruConsole.ErrorWriteLine("Received data is not an Aaru Remote Packet...");

            return -1;
        }

        if(hdr.packetType != AaruPacketType.ResponseAtaChs)
        {
            AaruConsole.ErrorWriteLine("Expected ATA CHS Response Packet, got packet type {0}...", hdr.packetType);

            return -1;
        }

        buf = new byte[hdr.len];
        len = Receive(_socket, buf, buf.Length, SocketFlags.None);

        if(len < buf.Length)
        {
            AaruConsole.ErrorWriteLine("Could not read from the network...");

            return -1;
        }

        AaruPacketResAtaChs res = Marshal.ByteArrayToStructureLittleEndian<AaruPacketResAtaChs>(buf);

        buffer = new byte[res.buf_len];
        Array.Copy(buf, Marshal.SizeOf<AaruPacketResAtaChs>(), buffer, 0, res.buf_len);
        duration       = res.duration;
        sense          = res.sense != 0;
        errorRegisters = res.registers;

        return (int)res.error_no;
    }

    /// <summary>Sends an ATA/ATAPI command to the remote device using 28-bit LBA addressing</summary>
    /// <returns>0 if no error occurred, otherwise, errno</returns>
    /// <param name="registers">ATA registers.</param>
    /// <param name="errorRegisters">Status/error registers.</param>
    /// <param name="protocol">ATA Protocol.</param>
    /// <param name="transferRegister">Indicates which register indicates the transfer length</param>
    /// <param name="buffer">Buffer for ATA/ATAPI command response</param>
    /// <param name="timeout">Timeout in seconds</param>
    /// <param name="transferBlocks">
    ///     If set to <c>true</c>, transfer is indicated in blocks, otherwise, it is indicated in
    ///     bytes.
    /// </param>
    /// <param name="duration">Time it took to execute the command in milliseconds</param>
    /// <param name="sense"><c>True</c> if ATA/ATAPI command returned non-OK status</param>
    public int SendAtaCommand(AtaRegistersLba28 registers, out AtaErrorRegistersLba28 errorRegisters,
                              AtaProtocol protocol, AtaTransferRegister transferRegister, ref byte[] buffer,
                              uint timeout, bool transferBlocks, out double duration, out bool sense)
    {
        duration       = 0;
        sense          = true;
        errorRegisters = new AtaErrorRegistersLba28();

        var cmdPkt = new AaruPacketCmdAtaLba28
        {
            hdr = new AaruPacketHeader
            {
                remote_id  = Consts.REMOTE_ID,
                packet_id  = Consts.PACKET_ID,
                version    = Consts.PACKET_VERSION,
                packetType = AaruPacketType.CommandAtaLba28
            },
            registers        = registers,
            protocol         = (byte)protocol,
            transferRegister = (byte)transferRegister,
            transferBlocks   = transferBlocks,
            timeout          = timeout * 1000
        };

        if(buffer != null)
            cmdPkt.buf_len = (uint)buffer.Length;

        cmdPkt.hdr.len = (uint)(Marshal.SizeOf<AaruPacketCmdAtaLba28>() + cmdPkt.buf_len);

        byte[] pktBuf = Marshal.StructureToByteArrayLittleEndian(cmdPkt);
        byte[] buf    = new byte[cmdPkt.hdr.len];

        Array.Copy(pktBuf, 0, buf, 0, Marshal.SizeOf<AaruPacketCmdAtaLba28>());

        if(buffer != null)
            Array.Copy(buffer, 0, buf, Marshal.SizeOf<AaruPacketCmdAtaLba28>(), cmdPkt.buf_len);

        int len = _socket.Send(buf, SocketFlags.None);

        if(len != buf.Length)
        {
            AaruConsole.ErrorWriteLine("Could not write to the network...");

            return -1;
        }

        byte[] hdrBuf = new byte[Marshal.SizeOf<AaruPacketHeader>()];

        len = Receive(_socket, hdrBuf, hdrBuf.Length, SocketFlags.Peek);

        if(len < hdrBuf.Length)
        {
            AaruConsole.ErrorWriteLine("Could not read from the network...");

            return -1;
        }

        AaruPacketHeader hdr = Marshal.ByteArrayToStructureLittleEndian<AaruPacketHeader>(hdrBuf);

        if(hdr.remote_id != Consts.REMOTE_ID ||
           hdr.packet_id != Consts.PACKET_ID)
        {
            AaruConsole.ErrorWriteLine("Received data is not an Aaru Remote Packet...");

            return -1;
        }

        if(hdr.packetType != AaruPacketType.ResponseAtaLba28)
        {
            AaruConsole.ErrorWriteLine("Expected ATA LBA28 Response Packet, got packet type {0}...", hdr.packetType);

            return -1;
        }

        buf = new byte[hdr.len];
        len = Receive(_socket, buf, buf.Length, SocketFlags.None);

        if(len < buf.Length)
        {
            AaruConsole.ErrorWriteLine("Could not read from the network...");

            return -1;
        }

        AaruPacketResAtaLba28 res = Marshal.ByteArrayToStructureLittleEndian<AaruPacketResAtaLba28>(buf);

        buffer = new byte[res.buf_len];
        Array.Copy(buf, Marshal.SizeOf<AaruPacketResAtaLba28>(), buffer, 0, res.buf_len);
        duration       = res.duration;
        sense          = res.sense != 0;
        errorRegisters = res.registers;

        return (int)res.error_no;
    }

    /// <summary>Sends an ATA/ATAPI command to the remote device using 48-bit LBA addressing</summary>
    /// <returns>0 if no error occurred, otherwise, errno</returns>
    /// <param name="registers">ATA registers.</param>
    /// <param name="errorRegisters">Status/error registers.</param>
    /// <param name="protocol">ATA Protocol.</param>
    /// <param name="transferRegister">Indicates which register indicates the transfer length</param>
    /// <param name="buffer">Buffer for ATA/ATAPI command response</param>
    /// <param name="timeout">Timeout in seconds</param>
    /// <param name="transferBlocks">
    ///     If set to <c>true</c>, transfer is indicated in blocks, otherwise, it is indicated in
    ///     bytes.
    /// </param>
    /// <param name="duration">Time it took to execute the command in milliseconds</param>
    /// <param name="sense"><c>True</c> if ATA/ATAPI command returned non-OK status</param>
    public int SendAtaCommand(AtaRegistersLba48 registers, out AtaErrorRegistersLba48 errorRegisters,
                              AtaProtocol protocol, AtaTransferRegister transferRegister, ref byte[] buffer,
                              uint timeout, bool transferBlocks, out double duration, out bool sense)
    {
        duration       = 0;
        sense          = true;
        errorRegisters = new AtaErrorRegistersLba48();

        var cmdPkt = new AaruPacketCmdAtaLba48
        {
            hdr = new AaruPacketHeader
            {
                remote_id  = Consts.REMOTE_ID,
                packet_id  = Consts.PACKET_ID,
                version    = Consts.PACKET_VERSION,
                packetType = AaruPacketType.CommandAtaLba48
            },
            registers        = registers,
            protocol         = (byte)protocol,
            transferRegister = (byte)transferRegister,
            transferBlocks   = transferBlocks,
            timeout          = timeout * 1000
        };

        if(buffer != null)
            cmdPkt.buf_len = (uint)buffer.Length;

        cmdPkt.hdr.len = (uint)(Marshal.SizeOf<AaruPacketCmdAtaLba48>() + cmdPkt.buf_len);

        byte[] pktBuf = Marshal.StructureToByteArrayLittleEndian(cmdPkt);
        byte[] buf    = new byte[cmdPkt.hdr.len];

        Array.Copy(pktBuf, 0, buf, 0, Marshal.SizeOf<AaruPacketCmdAtaLba48>());

        if(buffer != null)
            Array.Copy(buffer, 0, buf, Marshal.SizeOf<AaruPacketCmdAtaLba48>(), cmdPkt.buf_len);

        int len = _socket.Send(buf, SocketFlags.None);

        if(len != buf.Length)
        {
            AaruConsole.ErrorWriteLine("Could not write to the network...");

            return -1;
        }

        byte[] hdrBuf = new byte[Marshal.SizeOf<AaruPacketHeader>()];

        len = Receive(_socket, hdrBuf, hdrBuf.Length, SocketFlags.Peek);

        if(len < hdrBuf.Length)
        {
            AaruConsole.ErrorWriteLine("Could not read from the network...");

            return -1;
        }

        AaruPacketHeader hdr = Marshal.ByteArrayToStructureLittleEndian<AaruPacketHeader>(hdrBuf);

        if(hdr.remote_id != Consts.REMOTE_ID ||
           hdr.packet_id != Consts.PACKET_ID)
        {
            AaruConsole.ErrorWriteLine("Received data is not an Aaru Remote Packet...");

            return -1;
        }

        if(hdr.packetType != AaruPacketType.ResponseAtaLba48)
        {
            AaruConsole.ErrorWriteLine("Expected ATA LBA48 Response Packet, got packet type {0}...", hdr.packetType);

            return -1;
        }

        buf = new byte[hdr.len];
        len = Receive(_socket, buf, buf.Length, SocketFlags.None);

        if(len < buf.Length)
        {
            AaruConsole.ErrorWriteLine("Could not read from the network...");

            return -1;
        }

        AaruPacketResAtaLba48 res = Marshal.ByteArrayToStructureLittleEndian<AaruPacketResAtaLba48>(buf);

        buffer = new byte[res.buf_len];
        Array.Copy(buf, Marshal.SizeOf<AaruPacketResAtaLba48>(), buffer, 0, res.buf_len);
        duration       = res.duration;
        sense          = res.sense != 0;
        errorRegisters = res.registers;

        return (int)res.error_no;
    }

    /// <summary>Sends a MMC/SD command to the remote device</summary>
    /// <returns>The result of the command.</returns>
    /// <param name="command">MMC/SD opcode</param>
    /// <param name="buffer">Buffer for MMC/SD command response</param>
    /// <param name="timeout">Timeout in seconds</param>
    /// <param name="duration">Time it took to execute the command in milliseconds</param>
    /// <param name="sense"><c>True</c> if MMC/SD returned non-OK status</param>
    /// <param name="write"><c>True</c> if data is sent from host to card</param>
    /// <param name="isApplication"><c>True</c> if command should be preceded with CMD55</param>
    /// <param name="flags">Flags indicating kind and place of response</param>
    /// <param name="blocks">How many blocks to transfer</param>
    /// <param name="argument">Command argument</param>
    /// <param name="response">Response registers</param>
    /// <param name="blockSize">Size of block in bytes</param>
    public int SendMmcCommand(MmcCommands command, bool write, bool isApplication, MmcFlags flags, uint argument,
                              uint blockSize, uint blocks, ref byte[] buffer, out uint[] response, out double duration,
                              out bool sense, uint timeout = 0)
    {
        duration = 0;
        sense    = true;
        response = null;

        var cmdPkt = new AaruPacketCmdSdhci
        {
            hdr = new AaruPacketHeader
            {
                remote_id  = Consts.REMOTE_ID,
                packet_id  = Consts.PACKET_ID,
                version    = Consts.PACKET_VERSION,
                packetType = AaruPacketType.CommandSdhci
            },
            command = new AaruCmdSdhci
            {
                command     = command,
                write       = write,
                application = isApplication,
                flags       = flags,
                argument    = argument,
                block_size  = blockSize,
                blocks      = blocks,
                timeout     = timeout * 1000
            }
        };

        if(buffer != null)
            cmdPkt.command.buf_len = (uint)buffer.Length;

        cmdPkt.hdr.len = (uint)(Marshal.SizeOf<AaruPacketCmdSdhci>() + cmdPkt.command.buf_len);

        byte[] pktBuf = Marshal.StructureToByteArrayLittleEndian(cmdPkt);
        byte[] buf    = new byte[cmdPkt.hdr.len];

        Array.Copy(pktBuf, 0, buf, 0, Marshal.SizeOf<AaruPacketCmdSdhci>());

        if(buffer != null)
            Array.Copy(buffer, 0, buf, Marshal.SizeOf<AaruPacketCmdSdhci>(), cmdPkt.command.buf_len);

        int len = _socket.Send(buf, SocketFlags.None);

        if(len != buf.Length)
        {
            AaruConsole.ErrorWriteLine("Could not write to the network...");

            return -1;
        }

        byte[] hdrBuf = new byte[Marshal.SizeOf<AaruPacketHeader>()];

        len = Receive(_socket, hdrBuf, hdrBuf.Length, SocketFlags.Peek);

        if(len < hdrBuf.Length)
        {
            AaruConsole.ErrorWriteLine("Could not read from the network...");

            return -1;
        }

        AaruPacketHeader hdr = Marshal.ByteArrayToStructureLittleEndian<AaruPacketHeader>(hdrBuf);

        if(hdr.remote_id != Consts.REMOTE_ID ||
           hdr.packet_id != Consts.PACKET_ID)
        {
            AaruConsole.ErrorWriteLine("Received data is not an Aaru Remote Packet...");

            return -1;
        }

        if(hdr.packetType != AaruPacketType.ResponseSdhci)
        {
            AaruConsole.ErrorWriteLine("Expected SDHCI Response Packet, got packet type {0}...", hdr.packetType);

            return -1;
        }

        buf = new byte[hdr.len];
        len = Receive(_socket, buf, buf.Length, SocketFlags.None);

        if(len < buf.Length)
        {
            AaruConsole.ErrorWriteLine("Could not read from the network...");

            return -1;
        }

        AaruPacketResSdhci res = Marshal.ByteArrayToStructureLittleEndian<AaruPacketResSdhci>(buf);

        buffer = new byte[res.res.buf_len];
        Array.Copy(buf, Marshal.SizeOf<AaruPacketResSdhci>(), buffer, 0, res.res.buf_len);
        duration    = res.res.duration;
        sense       = res.res.sense != 0;
        response    = new uint[4];
        response[0] = res.res.response[0];
        response[1] = res.res.response[1];
        response[2] = res.res.response[2];
        response[3] = res.res.response[3];

        return (int)res.res.error_no;
    }

    /// <summary>Gets the <see cref="DeviceType" /> for the remote device</summary>
    /// <returns>
    ///     <see cref="DeviceType" />
    /// </returns>
    public DeviceType GetDeviceType()
    {
        var cmdPkt = new AaruPacketCmdGetDeviceType
        {
            hdr = new AaruPacketHeader
            {
                remote_id  = Consts.REMOTE_ID,
                packet_id  = Consts.PACKET_ID,
                len        = (uint)Marshal.SizeOf<AaruPacketCmdGetDeviceType>(),
                version    = Consts.PACKET_VERSION,
                packetType = AaruPacketType.CommandGetType
            }
        };

        byte[] buf = Marshal.StructureToByteArrayLittleEndian(cmdPkt);

        int len = _socket.Send(buf, SocketFlags.None);

        if(len != buf.Length)
        {
            AaruConsole.ErrorWriteLine("Could not write to the network...");

            return DeviceType.Unknown;
        }

        byte[] hdrBuf = new byte[Marshal.SizeOf<AaruPacketHeader>()];

        len = Receive(_socket, hdrBuf, hdrBuf.Length, SocketFlags.Peek);

        if(len < hdrBuf.Length)
        {
            AaruConsole.ErrorWriteLine("Could not read from the network...");

            return DeviceType.Unknown;
        }

        AaruPacketHeader hdr = Marshal.ByteArrayToStructureLittleEndian<AaruPacketHeader>(hdrBuf);

        if(hdr.remote_id != Consts.REMOTE_ID ||
           hdr.packet_id != Consts.PACKET_ID)
        {
            AaruConsole.ErrorWriteLine("Received data is not an Aaru Remote Packet...");

            return DeviceType.Unknown;
        }

        if(hdr.packetType != AaruPacketType.ResponseGetType)
        {
            AaruConsole.ErrorWriteLine("Expected Device Type Response Packet, got packet type {0}...", hdr.packetType);

            return DeviceType.Unknown;
        }

        buf = new byte[hdr.len];
        len = Receive(_socket, buf, buf.Length, SocketFlags.None);

        if(len < buf.Length)
        {
            AaruConsole.ErrorWriteLine("Could not read from the network...");

            return DeviceType.Unknown;
        }

        AaruPacketResGetDeviceType res = Marshal.ByteArrayToStructureLittleEndian<AaruPacketResGetDeviceType>(buf);

        return res.device_type;
    }

    /// <summary>Retrieves the SDHCI registers from the remote device</summary>
    /// <param name="csd">CSD register</param>
    /// <param name="cid">CID register</param>
    /// <param name="ocr">OCR register</param>
    /// <param name="scr">SCR register</param>
    /// <returns><c>true</c> if the device is attached to an SDHCI controller, <c>false</c> otherwise</returns>
    public bool GetSdhciRegisters(out byte[] csd, out byte[] cid, out byte[] ocr, out byte[] scr)
    {
        csd = null;
        cid = null;
        ocr = null;
        scr = null;

        var cmdPkt = new AaruPacketCmdGetSdhciRegisters
        {
            hdr = new AaruPacketHeader
            {
                remote_id  = Consts.REMOTE_ID,
                packet_id  = Consts.PACKET_ID,
                len        = (uint)Marshal.SizeOf<AaruPacketCmdGetSdhciRegisters>(),
                version    = Consts.PACKET_VERSION,
                packetType = AaruPacketType.CommandGetSdhciRegisters
            }
        };

        byte[] buf = Marshal.StructureToByteArrayLittleEndian(cmdPkt);

        int len = _socket.Send(buf, SocketFlags.None);

        if(len != buf.Length)
        {
            AaruConsole.ErrorWriteLine("Could not write to the network...");

            return false;
        }

        byte[] hdrBuf = new byte[Marshal.SizeOf<AaruPacketHeader>()];

        len = Receive(_socket, hdrBuf, hdrBuf.Length, SocketFlags.Peek);

        if(len < hdrBuf.Length)
        {
            AaruConsole.ErrorWriteLine("Could not read from the network...");

            return false;
        }

        AaruPacketHeader hdr = Marshal.ByteArrayToStructureLittleEndian<AaruPacketHeader>(hdrBuf);

        if(hdr.remote_id != Consts.REMOTE_ID ||
           hdr.packet_id != Consts.PACKET_ID)
        {
            AaruConsole.ErrorWriteLine("Received data is not an Aaru Remote Packet...");

            return false;
        }

        if(hdr.packetType != AaruPacketType.ResponseGetSdhciRegisters)
        {
            AaruConsole.ErrorWriteLine("Expected Device Type Response Packet, got packet type {0}...", hdr.packetType);

            return false;
        }

        buf = new byte[hdr.len];
        len = Receive(_socket, buf, buf.Length, SocketFlags.None);

        if(len < buf.Length)
        {
            AaruConsole.ErrorWriteLine("Could not read from the network...");

            return false;
        }

        AaruPacketResGetSdhciRegisters res =
            Marshal.ByteArrayToStructureLittleEndian<AaruPacketResGetSdhciRegisters>(buf);

        if(res.csd_len > 0)
        {
            if(res.csd_len > 16)
                res.csd_len = 16;

            csd = new byte[res.csd_len];

            Array.Copy(res.csd, 0, csd, 0, res.csd_len);
        }

        if(res.cid_len > 0)
        {
            if(res.cid_len > 16)
                res.cid_len = 16;

            cid = new byte[res.cid_len];

            Array.Copy(res.cid, 0, cid, 0, res.cid_len);
        }

        if(res.ocr_len > 0)
        {
            if(res.ocr_len > 16)
                res.ocr_len = 16;

            ocr = new byte[res.ocr_len];

            Array.Copy(res.ocr, 0, ocr, 0, res.ocr_len);
        }

        switch(res.scr_len)
        {
            case <= 0: return res.isSdhci;
            case > 16:
                res.scr_len = 16;

                break;
        }

        scr = new byte[res.scr_len];

        Array.Copy(res.scr, 0, scr, 0, res.scr_len);

        return res.isSdhci;
    }

    /// <summary>Gets the USB data from the remote device</summary>
    /// <param name="descriptors">USB descriptors</param>
    /// <param name="idVendor">USB vendor ID</param>
    /// <param name="idProduct">USB product ID</param>
    /// <param name="manufacturer">USB manufacturer string</param>
    /// <param name="product">USB product string</param>
    /// <param name="serial">USB serial number string</param>
    /// <returns><c>true</c> if the device is attached via USB, <c>false</c> otherwise</returns>
    public bool GetUsbData(out byte[] descriptors, out ushort idVendor, out ushort idProduct, out string manufacturer,
                           out string product, out string serial)
    {
        descriptors  = null;
        idVendor     = 0;
        idProduct    = 0;
        manufacturer = null;
        product      = null;
        serial       = null;

        var cmdPkt = new AaruPacketCmdGetUsbData
        {
            hdr = new AaruPacketHeader
            {
                remote_id  = Consts.REMOTE_ID,
                packet_id  = Consts.PACKET_ID,
                len        = (uint)Marshal.SizeOf<AaruPacketCmdGetUsbData>(),
                version    = Consts.PACKET_VERSION,
                packetType = AaruPacketType.CommandGetUsbData
            }
        };

        byte[] buf = Marshal.StructureToByteArrayLittleEndian(cmdPkt);

        int len = _socket.Send(buf, SocketFlags.None);

        if(len != buf.Length)
        {
            AaruConsole.ErrorWriteLine("Could not write to the network...");

            return false;
        }

        byte[] hdrBuf = new byte[Marshal.SizeOf<AaruPacketHeader>()];

        len = Receive(_socket, hdrBuf, hdrBuf.Length, SocketFlags.Peek);

        if(len < hdrBuf.Length)
        {
            AaruConsole.ErrorWriteLine("Could not read from the network...");

            return false;
        }

        AaruPacketHeader hdr = Marshal.ByteArrayToStructureLittleEndian<AaruPacketHeader>(hdrBuf);

        if(hdr.remote_id != Consts.REMOTE_ID ||
           hdr.packet_id != Consts.PACKET_ID)
        {
            AaruConsole.ErrorWriteLine("Received data is not an Aaru Remote Packet...");

            return false;
        }

        if(hdr.packetType != AaruPacketType.ResponseGetUsbData)
        {
            AaruConsole.ErrorWriteLine("Expected USB Data Response Packet, got packet type {0}...", hdr.packetType);

            return false;
        }

        buf = new byte[hdr.len];
        len = Receive(_socket, buf, buf.Length, SocketFlags.None);

        if(len < buf.Length)
        {
            AaruConsole.ErrorWriteLine("Could not read from the network...");

            return false;
        }

        AaruPacketResGetUsbData res = Marshal.ByteArrayToStructureLittleEndian<AaruPacketResGetUsbData>(buf);

        if(!res.isUsb)
            return false;

        descriptors = new byte[res.descLen];
        Array.Copy(res.descriptors, 0, descriptors, 0, res.descLen);
        idVendor     = res.idVendor;
        idProduct    = res.idProduct;
        manufacturer = res.manufacturer;
        product      = res.product;
        serial       = res.serial;

        return true;
    }

    /// <summary>Gets the FireWire data from the remote device</summary>
    /// <param name="idVendor">FireWire vendor ID</param>
    /// <param name="idProduct">FireWire product ID</param>
    /// <param name="vendor">FireWire vendor string</param>
    /// <param name="model">FireWire model string</param>
    /// <param name="guid">FireWire GUID</param>
    /// <returns><c>true</c> if the device is attached via FireWire, <c>false</c> otherwise</returns>
    public bool GetFireWireData(out uint idVendor, out uint idProduct, out ulong guid, out string vendor,
                                out string model)
    {
        idVendor  = 0;
        idProduct = 0;
        guid      = 0;
        vendor    = null;
        model     = null;

        var cmdPkt = new AaruPacketCmdGetFireWireData
        {
            hdr = new AaruPacketHeader
            {
                remote_id  = Consts.REMOTE_ID,
                packet_id  = Consts.PACKET_ID,
                len        = (uint)Marshal.SizeOf<AaruPacketCmdGetFireWireData>(),
                version    = Consts.PACKET_VERSION,
                packetType = AaruPacketType.CommandGetFireWireData
            }
        };

        byte[] buf = Marshal.StructureToByteArrayLittleEndian(cmdPkt);

        int len = _socket.Send(buf, SocketFlags.None);

        if(len != buf.Length)
        {
            AaruConsole.ErrorWriteLine("Could not write to the network...");

            return false;
        }

        byte[] hdrBuf = new byte[Marshal.SizeOf<AaruPacketHeader>()];

        len = Receive(_socket, hdrBuf, hdrBuf.Length, SocketFlags.Peek);

        if(len < hdrBuf.Length)
        {
            AaruConsole.ErrorWriteLine("Could not read from the network...");

            return false;
        }

        AaruPacketHeader hdr = Marshal.ByteArrayToStructureLittleEndian<AaruPacketHeader>(hdrBuf);

        if(hdr.remote_id != Consts.REMOTE_ID ||
           hdr.packet_id != Consts.PACKET_ID)
        {
            AaruConsole.ErrorWriteLine("Received data is not an Aaru Remote Packet...");

            return false;
        }

        if(hdr.packetType != AaruPacketType.ResponseGetFireWireData)
        {
            AaruConsole.ErrorWriteLine("Expected FireWire Data Response Packet, got packet type {0}...",
                                       hdr.packetType);

            return false;
        }

        buf = new byte[hdr.len];
        len = Receive(_socket, buf, buf.Length, SocketFlags.None);

        if(len < buf.Length)
        {
            AaruConsole.ErrorWriteLine("Could not read from the network...");

            return false;
        }

        AaruPacketResGetFireWireData res = Marshal.ByteArrayToStructureLittleEndian<AaruPacketResGetFireWireData>(buf);

        if(!res.isFireWire)
            return false;

        idVendor  = res.idVendor;
        idProduct = res.idModel;
        guid      = res.guid;
        vendor    = res.vendor;
        model     = res.model;

        return true;
    }

    /// <summary>Gets the PCMCIA/CardBus data from the remote device</summary>
    /// <param name="cis">Card Information Structure</param>
    /// <returns><c>true</c> if the device is attached via PCMCIA or CardBus, <c>false</c> otherwise</returns>
    public bool GetPcmciaData(out byte[] cis)
    {
        cis = null;

        var cmdPkt = new AaruPacketCmdGetPcmciaData
        {
            hdr = new AaruPacketHeader
            {
                remote_id  = Consts.REMOTE_ID,
                packet_id  = Consts.PACKET_ID,
                len        = (uint)Marshal.SizeOf<AaruPacketCmdGetPcmciaData>(),
                version    = Consts.PACKET_VERSION,
                packetType = AaruPacketType.CommandGetPcmciaData
            }
        };

        byte[] buf = Marshal.StructureToByteArrayLittleEndian(cmdPkt);

        int len = _socket.Send(buf, SocketFlags.None);

        if(len != buf.Length)
        {
            AaruConsole.ErrorWriteLine("Could not write to the network...");

            return false;
        }

        byte[] hdrBuf = new byte[Marshal.SizeOf<AaruPacketHeader>()];

        len = Receive(_socket, hdrBuf, hdrBuf.Length, SocketFlags.Peek);

        if(len < hdrBuf.Length)
        {
            AaruConsole.ErrorWriteLine("Could not read from the network...");

            return false;
        }

        AaruPacketHeader hdr = Marshal.ByteArrayToStructureLittleEndian<AaruPacketHeader>(hdrBuf);

        if(hdr.remote_id != Consts.REMOTE_ID ||
           hdr.packet_id != Consts.PACKET_ID)
        {
            AaruConsole.ErrorWriteLine("Received data is not an Aaru Remote Packet...");

            return false;
        }

        if(hdr.packetType != AaruPacketType.ResponseGetPcmciaData)
        {
            AaruConsole.ErrorWriteLine("Expected PCMCIA Data Response Packet, got packet type {0}...", hdr.packetType);

            return false;
        }

        buf = new byte[hdr.len];
        len = Receive(_socket, buf, buf.Length, SocketFlags.None);

        if(len < buf.Length)
        {
            AaruConsole.ErrorWriteLine("Could not read from the network...");

            return false;
        }

        AaruPacketResGetPcmciaData res = Marshal.ByteArrayToStructureLittleEndian<AaruPacketResGetPcmciaData>(buf);

        if(!res.isPcmcia)
            return false;

        cis = res.cis;

        return true;
    }

    /// <summary>Receives data from a socket into a buffer</summary>
    /// <param name="socket">Socket</param>
    /// <param name="buffer">Data buffer</param>
    /// <param name="size">Expected total size in bytes</param>
    /// <param name="socketFlags">Socket flags</param>
    /// <returns>Retrieved number of bytes</returns>
    static int Receive(Socket socket, byte[] buffer, int size, SocketFlags socketFlags)
    {
        int offset = 0;

        while(size > 0)
        {
            int got = socket.Receive(buffer, offset, size, socketFlags);

            if(got <= 0)
                break;

            offset += got;
            size   -= got;
        }

        return offset;
    }

    /// <summary>Closes the remote device, without closing the network connection</summary>
    public void Close()
    {
        var cmdPkt = new AaruPacketCmdClose
        {
            hdr = new AaruPacketHeader
            {
                remote_id  = Consts.REMOTE_ID,
                packet_id  = Consts.PACKET_ID,
                len        = (uint)Marshal.SizeOf<AaruPacketCmdClose>(),
                version    = Consts.PACKET_VERSION,
                packetType = AaruPacketType.CommandCloseDevice
            }
        };

        byte[] buf = Marshal.StructureToByteArrayLittleEndian(cmdPkt);

        try
        {
            _socket.Send(buf, SocketFlags.None);
        }
        catch(ObjectDisposedException)
        {
            // Ignore if already disposed
        }
    }

    /// <summary>
    ///     Concatenates a queue of commands to be send to a remote SecureDigital or MultiMediaCard attached to an SDHCI
    ///     controller
    /// </summary>
    /// <param name="commands">List of commands</param>
    /// <param name="duration">Duration to execute all commands, in milliseconds</param>
    /// <param name="sense">Set to <c>true</c> if any of the commands returned an error status, <c>false</c> otherwise</param>
    /// <param name="timeout">Maximum allowed time to execute a single command</param>
    /// <returns>0 if no error occurred, otherwise, errno</returns>
    public int SendMultipleMmcCommands(Devices.Device.MmcSingleCommand[] commands, out double duration, out bool sense,
                                       uint timeout = 0)
    {
        if(ServerProtocolVersion < 2)
            return SendMultipleMmcCommandsV1(commands, out duration, out sense, timeout);

        sense    = false;
        duration = 0;

        long packetSize = Marshal.SizeOf<AaruPacketMultiCmdSdhci>() +
                          (Marshal.SizeOf<AaruCmdSdhci>() * commands.LongLength);

        packetSize = commands.Aggregate(packetSize, (current, command) => current + (command.buffer?.Length ?? 0));

        var packet = new AaruPacketMultiCmdSdhci
        {
            cmd_count = (ulong)commands.LongLength,
            hdr = new AaruPacketHeader
            {
                len        = (uint)packetSize,
                packetType = AaruPacketType.MultiCommandSdhci,
                remote_id  = Consts.REMOTE_ID,
                packet_id  = Consts.PACKET_ID,
                version    = Consts.PACKET_VERSION
            }
        };

        byte[] buf = new byte[packetSize];
        byte[] tmp = Marshal.StructureToByteArrayLittleEndian(packet);

        Array.Copy(tmp, 0, buf, 0, tmp.Length);

        int off = tmp.Length;

        foreach(AaruCmdSdhci cmd in commands.Select(command => new AaruCmdSdhci
                {
                    application = command.isApplication,
                    argument    = command.argument,
                    block_size  = command.blockSize,
                    blocks      = command.blocks,
                    buf_len     = (uint)(command.buffer?.Length ?? 0),
                    command     = command.command,
                    flags       = command.flags,
                    timeout     = timeout,
                    write       = command.write
                }))
        {
            tmp = Marshal.StructureToByteArrayLittleEndian(cmd);
            Array.Copy(tmp, 0, buf, off, tmp.Length);

            off += tmp.Length;
        }

        foreach(Devices.Device.MmcSingleCommand command in
                commands.Where(command => (command.buffer?.Length ?? 0) != 0))
        {
            Array.Copy(command.buffer, 0, buf, off, command.buffer.Length);

            off += command.buffer.Length;
        }

        int len = _socket.Send(buf, SocketFlags.None);

        if(len != buf.Length)
        {
            AaruConsole.ErrorWriteLine("Could not write to the network...");

            return -1;
        }

        byte[] hdrBuf = new byte[Marshal.SizeOf<AaruPacketHeader>()];

        len = Receive(_socket, hdrBuf, hdrBuf.Length, SocketFlags.Peek);

        if(len < hdrBuf.Length)
        {
            AaruConsole.ErrorWriteLine("Could not read from the network...");

            return -1;
        }

        AaruPacketHeader hdr = Marshal.ByteArrayToStructureLittleEndian<AaruPacketHeader>(hdrBuf);

        if(hdr.remote_id != Consts.REMOTE_ID ||
           hdr.packet_id != Consts.PACKET_ID)
        {
            AaruConsole.ErrorWriteLine("Received data is not an Aaru Remote Packet...");

            return -1;
        }

        if(hdr.packetType != AaruPacketType.ResponseMultiSdhci)
        {
            AaruConsole.ErrorWriteLine("Expected multi MMC/SD command Response Packet, got packet type {0}...",
                                       hdr.packetType);

            return -1;
        }

        buf = new byte[hdr.len];
        len = Receive(_socket, buf, buf.Length, SocketFlags.None);

        if(len < buf.Length)
        {
            AaruConsole.ErrorWriteLine("Could not read from the network...");

            return -1;
        }

        AaruPacketMultiCmdSdhci res = Marshal.ByteArrayToStructureLittleEndian<AaruPacketMultiCmdSdhci>(buf);

        if(res.cmd_count != (ulong)commands.Length)
        {
            AaruConsole.ErrorWriteLine("Expected the response to {0} SD/MMC commands, but got {1} responses...",
                                       commands.Length, res.cmd_count);

            return -1;
        }

        off = Marshal.SizeOf<AaruPacketMultiCmdSdhci>();

        int error = 0;

        foreach(Devices.Device.MmcSingleCommand command in commands)
        {
            AaruResSdhci cmdRes =
                Marshal.ByteArrayToStructureLittleEndian<AaruResSdhci>(buf, off, Marshal.SizeOf<AaruResSdhci>());

            command.response =  cmdRes.response;
            duration         += cmdRes.duration;

            if(cmdRes.error_no != 0 &&
               error           == 0)
                error = (int)cmdRes.error_no;

            if(cmdRes.sense != 0)
                sense = true;

            if(cmdRes.buf_len > 0)
                command.buffer = new byte[cmdRes.buf_len];

            off += Marshal.SizeOf<AaruResSdhci>();
        }

        foreach(Devices.Device.MmcSingleCommand command in commands)
        {
            Array.Copy(buf, off, command.buffer, 0, command.buffer.Length);
            off += command.buffer.Length;
        }

        return error;
    }

    /// <summary>
    ///     Concatenates a queue of commands to be send to a remote SecureDigital or MultiMediaCard attached to an SDHCI
    ///     controller, using protocol version 1 without specific support for such a queueing
    /// </summary>
    /// <param name="commands">List of commands</param>
    /// <param name="duration">Duration to execute all commands, in milliseconds</param>
    /// <param name="sense">Set to <c>true</c> if any of the commands returned an error status, <c>false</c> otherwise</param>
    /// <param name="timeout">Maximum allowed time to execute a single command</param>
    /// <returns>0 if no error occurred, otherwise, errno</returns>
    int SendMultipleMmcCommandsV1(Devices.Device.MmcSingleCommand[] commands, out double duration, out bool sense,
                                  uint timeout)
    {
        sense    = false;
        duration = 0;
        int error = 0;

        foreach(Devices.Device.MmcSingleCommand command in commands)
        {
            error = SendMmcCommand(command.command, command.write, command.isApplication, command.flags,
                                   command.argument, command.blockSize, command.blocks, ref command.buffer,
                                   out command.response, out double cmdDuration, out bool cmdSense, timeout);

            if(cmdSense)
                sense = true;

            duration += cmdDuration;
        }

        return error;
    }

    /// <summary>Closes then immediately reopens a remote device</summary>
    /// <returns>Returned error number if any</returns>
    public bool ReOpen()
    {
        if(ServerProtocolVersion < 2)
            return false;

        var cmdPkt = new AaruPacketCmdReOpen
        {
            hdr = new AaruPacketHeader
            {
                remote_id  = Consts.REMOTE_ID,
                packet_id  = Consts.PACKET_ID,
                len        = (uint)Marshal.SizeOf<AaruPacketCmdReOpen>(),
                version    = Consts.PACKET_VERSION,
                packetType = AaruPacketType.CommandReOpenDevice
            }
        };

        byte[] buf = Marshal.StructureToByteArrayLittleEndian(cmdPkt);

        int len = _socket.Send(buf, SocketFlags.None);

        if(len != buf.Length)
        {
            AaruConsole.ErrorWriteLine("Could not write to the network...");

            return false;
        }

        byte[] hdrBuf = new byte[Marshal.SizeOf<AaruPacketHeader>()];

        len = Receive(_socket, hdrBuf, hdrBuf.Length, SocketFlags.Peek);

        if(len < hdrBuf.Length)
        {
            AaruConsole.ErrorWriteLine("Could not read from the network...");

            return false;
        }

        AaruPacketHeader hdr = Marshal.ByteArrayToStructureLittleEndian<AaruPacketHeader>(hdrBuf);

        if(hdr.remote_id != Consts.REMOTE_ID ||
           hdr.packet_id != Consts.PACKET_ID)
        {
            AaruConsole.ErrorWriteLine("Received data is not an Aaru Remote Packet...");

            return false;
        }

        if(hdr.packetType != AaruPacketType.Nop)
        {
            AaruConsole.ErrorWriteLine("Expected NOP Packet, got packet type {0}...", hdr.packetType);

            return false;
        }

        if(hdr.version != Consts.PACKET_VERSION)
        {
            AaruConsole.ErrorWriteLine("Unrecognized packet version...");

            return false;
        }

        buf = new byte[hdr.len];
        len = Receive(_socket, buf, buf.Length, SocketFlags.None);

        if(len < buf.Length)
        {
            AaruConsole.ErrorWriteLine("Could not read from the network...");

            return false;
        }

        AaruPacketNop nop = Marshal.ByteArrayToStructureLittleEndian<AaruPacketNop>(buf);

        switch(nop.reasonCode)
        {
            case AaruNopReason.ReOpenOk: return true;
            case AaruNopReason.CloseError:
            case AaruNopReason.OpenError:
                AaruConsole.ErrorWriteLine("ReOpen error closing device...");

                break;
            default:
                AaruConsole.ErrorWriteLine("ReOpen error {0} with reason: {1}...", nop.errno, nop.reason);

                break;
        }

        return false;
    }

    /// <summary>Reads data using operating system buffers.</summary>
    /// <param name="buffer">Data buffer</param>
    /// <param name="offset">Offset in remote device to start reading, in bytes</param>
    /// <param name="length">Number of bytes to read</param>
    /// <param name="duration">Total time in milliseconds the reading took</param>
    /// <returns><c>true</c> if there was an error, <c>false</c> otherwise</returns>
    public bool BufferedOsRead(out byte[] buffer, long offset, uint length, out double duration)
    {
        duration = 0;
        buffer   = null;

        if(ServerProtocolVersion < 2)
            return false;

        var cmdPkt = new AaruPacketCmdOsRead
        {
            hdr = new AaruPacketHeader
            {
                remote_id  = Consts.REMOTE_ID,
                packet_id  = Consts.PACKET_ID,
                len        = (uint)Marshal.SizeOf<AaruPacketCmdOsRead>(),
                version    = Consts.PACKET_VERSION,
                packetType = AaruPacketType.CommandOsRead
            },
            length = length,
            offset = (ulong)offset
        };

        byte[] buf = Marshal.StructureToByteArrayLittleEndian(cmdPkt);

        int len = _socket.Send(buf, SocketFlags.None);

        if(len != buf.Length)
        {
            AaruConsole.ErrorWriteLine("Could not write to the network...");

            return false;
        }

        byte[] hdrBuf = new byte[Marshal.SizeOf<AaruPacketHeader>()];

        len = Receive(_socket, hdrBuf, hdrBuf.Length, SocketFlags.Peek);

        if(len < hdrBuf.Length)
        {
            AaruConsole.ErrorWriteLine("Could not read from the network...");

            return false;
        }

        AaruPacketHeader hdr = Marshal.ByteArrayToStructureLittleEndian<AaruPacketHeader>(hdrBuf);

        if(hdr.remote_id != Consts.REMOTE_ID ||
           hdr.packet_id != Consts.PACKET_ID)
        {
            AaruConsole.ErrorWriteLine("Received data is not an Aaru Remote Packet...");

            return false;
        }

        if(hdr.packetType != AaruPacketType.ResponseOsRead)
        {
            AaruConsole.ErrorWriteLine("Expected OS Read Response Packet, got packet type {0}...", hdr.packetType);

            return false;
        }

        if(hdr.version != Consts.PACKET_VERSION)
        {
            AaruConsole.ErrorWriteLine("Unrecognized packet version...");

            return false;
        }

        buf = new byte[hdr.len];
        len = Receive(_socket, buf, buf.Length, SocketFlags.None);

        if(len < buf.Length)
        {
            AaruConsole.ErrorWriteLine("Could not read from the network...");

            return false;
        }

        AaruPacketResOsRead osRead = Marshal.ByteArrayToStructureLittleEndian<AaruPacketResOsRead>(buf);

        duration = osRead.duration;

        if(osRead.errno != 0)
        {
            AaruConsole.ErrorWriteLine("Remote error {0} in OS Read...", osRead.errno);

            return false;
        }

        buffer = new byte[length];
        Array.Copy(buf, Marshal.SizeOf<AaruPacketResOsRead>(), buffer, 0, length);

        return true;
    }
}