/* Code style: -*- linux-c -*- */
/* File : xfw/find/grab_ips_from_net.c */

#include <stdio.h>
#include "range.h"
#include <sys/types.h>
#include <sys/socket.h>


struct ip_chain raw_list;


void grab_ips_from_net(void)
{
  int sd;
  int dest;
  char tmp[4];
  struct ifreq ifr, oldifr;
  struct sockaddr saddr;
  int sizeaddr;
  unsigned char buf[1600];
  int length;
  
  
  /* OPEN SOCKET */
  
  if ((sd = socket (AF_INET, SOCK_PACKET, htons (ETH_P_ALL))) < 0)
    {
      perror ("Can't get socket: ");
      exit (1);
    }
  
  /* SET PROMISC AND HOLD ONTO A COPY OF ORIGINAL STATE */
  
  strcpy (oldifr.ifr_name, "eth0");
  if (ioctl (sd, SIOCGIFFLAGS, &oldifr) < 0)
    {
      close (sd);
      perror ("Can't get flags: ");
      exit (2);
    }
  
  ifr = oldifr;
/*  ifr.ifr_flags |= IFF_PROMISC; */
  
  if (ioctl (sd, SIOCSIFFLAGS, &ifr) < 0)
    {
      close (sd);
      perror ("Can't set flags: ");
      exit (3);
    }
  
  while ( 1==1 ) {
    sizeaddr = 1600;
    length = recvfrom (sd, buf, 1600, 0, &saddr, &sizeaddr);
    
    /* if recvfrom() is interrupted by the sheduler, an EINTR happens. */
    
    if (length < 0 )
      continue;
    else {
      /* VERY hard coded - ip's at 26-29 inc & 30-33 inc*/
      
      dest = ((int)buf[30] << 24) +
	((int)buf[31] << 16) +
	  ((int)buf[32] << 8) +
	    (int)buf[33];
      
      printf("src/dest: %s\n", ip_to_str(dest));

      new_ip = calloc(1, sizeof(ip_chain));
      new_ip.ip = dest
      new_ip.next = NULL;
      new_ip.prev = 
    }
  }
}




int main()
{
  struct ip_chain start_raw_chain;

  start_raw_chain = calloc(1, sizeof(ip_chain));

  /* calloc does this but I'll do it anyway */
  start_raw_chain.prev = NULL;
  start_raw_chain.next = NULL;
  start_raw_chain.ip = 0;

  grab_ips_from_net(&start_raw_chain);

  return 0;
}


.