iflist.c

An ethernet bridge / VPN program for windows

/*
 * Copyright (c) 1999 - 2002
 *	Politecnico di Torino.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that: (1) source code distributions
 * retain the above copyright notice and this paragraph in its entirety, (2)
 * distributions including binary code include the above copyright notice and
 * this paragraph in its entirety in the documentation or other materials
 * provided with the distribution, and (3) all advertising materials mentioning
 * features or use of this software display the following acknowledgement:
 * ``This product includes software developed by the Politecnico
 * di Torino, and its contributors.'' Neither the name of
 * the University nor the names of its contributors may be used to endorse
 * or promote products derived from this software without specific prior
 * written permission.
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 */

#include "pcap.h"
#ifndef WIN32
#include <sys/socket.h>
#include <netinet/in.h>
#else
#include <winsock.h>
#endif

void ifprint(pcap_if_t *d);
char *iptos(u_long in);

int main()
{
  pcap_if_t *alldevs;
  pcap_if_t *d;
  char errbuf[PCAP_ERRBUF_SIZE+1];

  /* Retrieve the interfaces list */
  if (pcap_findalldevs(&alldevs, errbuf) == -1)
  {
    fprintf(stderr,"Error in pcap_findalldevs: %s\n",errbuf);
    exit(1);
  }

  /* Scan the list printing every entry */
  for(d=alldevs;d;d=d->next)
  {
    ifprint(d);
  }

  return 1;
}

/* Print all the available information on the given interface */
void ifprint(pcap_if_t *d)
{
  pcap_addr_t *a;

  /* Name */
  printf("%s\n",d->name);

  /* Description */
  if (d->description)
    printf("\tDescription: %s\n",d->description);

  /* Loopback Address*/
  printf("\tLoopback: %s\n",(d->flags & PCAP_IF_LOOPBACK)?"yes":"no");

  /* IP addresses */
  for(a=d->addresses;a;a=a->next) {
    printf("\tAddress Family: #%d\n",a->addr->sa_family);
  
    switch(a->addr->sa_family)
    {
      case AF_INET:
        printf("\tAddress Family Name: AF_INET\n");
        if (a->addr)
          printf("\tAddress: %s\n",iptos(((struct sockaddr_in *)a->addr)->sin_addr.s_addr));
        if (a->netmask)
          printf("\tNetmask: %s\n",iptos(((struct sockaddr_in *)a->netmask)->sin_addr.s_addr));
        if (a->broadaddr)
          printf("\tBroadcast Address: %s\n",iptos(((struct sockaddr_in *)a->broadaddr)->sin_addr.s_addr));
        if (a->dstaddr)
          printf("\tDestination Address: %s\n",iptos(((struct sockaddr_in *)a->dstaddr)->sin_addr.s_addr));
        break;
      default:
        printf("\tAddress Family Name: Unknown\n");
        break;
    }
  }
  printf("\n");
}

/* From tcptraceroute, convert a numeric IP address to a string */
#define IPTOSBUFFERS	12
char *iptos(u_long in)
{
	static char output[IPTOSBUFFERS][3*4+3+1];
	static short which;
	u_char *p;

	p = (u_char *)&in;
	which = (which + 1 == IPTOSBUFFERS ? 0 : which + 1);
	sprintf(output[which], "%d.%d.%d.%d", p[0], p[1], p[2], p[3]);
	return output[which];
}