Super Ping

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

#define DEFDATALEN      56
#define MAXIPLEN        60
#define MAXICMPLEN      76

static char *hostname = NULL;

static int in_cksum(unsigned short *buf, int sz)
{
  int nleft = sz;
  int sum = 0;
  unsigned short *w = buf;
  unsigned short ans = 0;

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

  if (nleft == 1) {
    *(unsigned char *) (&ans) = *(unsigned char *) w;
    sum += ans;
  }

  sum = (sum >> 16) + (sum & 0xFFFF);
  sum += (sum >> 16);
//   ans = .sum;
  ans = ~sum;
  return (ans);
}

static void noresp(int ign)
{
  printf("No response from %s\n", hostname);
  exit(0);
}

static void ping(const char *host)
{

  struct hostent *h;
  struct sockaddr_in pingaddr;
  struct icmp *pkt;
  int pingsock, c;
  char packet[DEFDATALEN + MAXIPLEN + MAXICMPLEN];

  if ((pingsock = socket(AF_INET, SOCK_RAW, 1)) < 0) {       /* 1 == ICMP */
    perror("ping: creating a raw socket");
    exit(1);
  }

  /* drop root privs if running setuid */
  setuid(getuid());

  memset(&pingaddr, 0, sizeof(struct sockaddr_in));

  pingaddr.sin_family = AF_INET;
  if (!(h = gethostbyname(host))) {
    fprintf(stderr, "ping: unknown host %s\n", host);
    exit(1);
  }
  memcpy(&pingaddr.sin_addr, h->h_addr, sizeof(pingaddr.sin_addr));
  hostname = h->h_name;

  pkt = (struct icmp *) packet;
  memset(pkt, 0, sizeof(packet));
  pkt->icmp_type = ICMP_ECHO;
  pkt->icmp_cksum = in_cksum((unsigned short *) pkt, sizeof(packet));

  c = sendto(pingsock, packet, sizeof(packet), 0,
             (struct sockaddr *) &pingaddr, sizeof(struct sockaddr_in));
  if (c < 0 || c != sizeof(packet)) {
    if (c < 0)
      perror("ping: sendto");
    fprintf(stderr, "ping: write incomplete\n");
    exit(1);
  }

  close(pingsock);

  return;
}

int main ()
{
//printf( "Well fuck:" );
int ip1; // X.X.X.1
int ip2; // X.X.1.X
int ip3; // X.1.X.X
int ip4; // 1.X.X.X
ip1 = 1;
ip2 = 1;
ip3 = 1;
ip4 = 50;
char s1[6];
char s2[6];
char s3[6];
char s4[6];
char full[50];



while(1){
ip1++;
if(ip1 == 254){
    ip2++;
    ip1 = 0;
}
if(ip2 == 254){
    ip3++;
    ip2 = 0;
    printf( "\nIP: %s", full );
}
if(ip3 == 254){
    ip4++;
    ip3 = 0;
}

sprintf(s1, "%d", ip1);
sprintf(s2, "%d", ip2);
sprintf(s3, "%d", ip3);
sprintf(s4, "%d", ip4);

/*
  strcpy( full, s1 );
  strcat( full, "." );
  strcpy( full, s2 );
  strcat( full, "." );
  strcpy( full, s3 );
  strcat( full, "." );
  strcpy( full, s4 ); */
  sprintf( full, "%s.%s.%s.%s", s4, s3, s2, s1 );

  //printf( "\nIP: %s", full );


ping (full);

}
return;
}