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/*
* $Id: get_mac.c,v 1.1.1.1 2000/05/25 00:28:49 route Exp $
*
* libnet
* get_mac.c - get the MAC address of a remote host
*
* Copyright (c) 1998 - 2001 Mike D. Schiffman <mike@infonexus.com>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
*/
#if (HAVE_CONFIG_H)
#include "../../include/config.h"
#endif
#include <libnet.h>
#include <pcap.h>
#define IP_UCHAR_COMP(x, y) \
(x[0] == y[0] && x[1] == y[1] && x[2] == y[2] && x[3] == y[3])
u_char enet_dst[6] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
int libnet_do_arp(struct libnet_link_int *, u_char *, struct ether_addr *,
u_long);
int
main(int argc, char *argv[])
{
int i, c;
char errbuf[256];
char *device = NULL;
struct libnet_link_int *l;
struct ether_addr e;
u_long ip;
while ((c = getopt(argc, argv, "i:")) != EOF)
{
switch (c)
{
case 'i':
device = optarg;
break;
default:
exit(EXIT_FAILURE);
}
}
if (!device)
{
fprintf(stderr, "Specify a device\n");
exit(EXIT_FAILURE);
}
if (argc > optind)
{
if ((ip = libnet_name_resolve(argv[optind], 1)) == -1)
{
fprintf(stderr, "Cannot resolve IP address\n");
exit(EXIT_FAILURE);
}
}
else
{
fprintf(stderr, "IP address to ARP for?\n");
exit(EXIT_FAILURE);
}
l = libnet_open_link_interface(device, errbuf);
if (!l)
{
fprintf(stderr, "libnet_open_link_interface: %s\n", errbuf);
exit(EXIT_FAILURE);
}
c = libnet_do_arp(l, device, &e, ip);
if (c != -1)
{
for (i = 0; i < 6; i++)
{
printf("%x", e.ether_addr_octet[i]);
if (i != 5)
{
printf(":");
}
}
printf("\n");
}
return (c == -1 ? EXIT_FAILURE : EXIT_SUCCESS);
}
int
libnet_do_arp(struct libnet_link_int *l, u_char *device, struct ether_addr *e,
u_long ip)
{
int n, i;
u_char *buf, errbuf[256], *packet, *ip_p;
struct libnet_ethernet_hdr *p;
struct libnet_arp_hdr *a;
u_long local_ip;
pcap_t *pd;
struct pcap_pkthdr pc_hdr;
/*
* Initialize a packet.
*/
if (libnet_init_packet(LIBNET_ARP_H + LIBNET_ETH_H, &buf) == -1)
{
perror("libnet_init_packet memory:");
exit(EXIT_FAILURE);
}
/*
* Get the ethernet address of the device.
*/
e = libnet_get_hwaddr(l, device, errbuf);
if (e == NULL)
{
fprintf(stderr, "libnet_get_hwaddr: %s\n", errbuf);
return (-1);
}
/*
* Get the IP address of the device.
*/
local_ip = htonl(libnet_get_ipaddr(l, device, errbuf));
if (!local_ip)
{
fprintf(stderr, "libnet_get_ipaddr: %s\n", errbuf);
return (-1);
}
/*
* Open the pcap device.
*/
pd = pcap_open_live(device, LIBNET_ARP_H + LIBNET_ETH_H, 1, 500, errbuf);
if (pd == NULL)
{
fprintf(stderr, "pcap_open_live: %s\n", errbuf);
return (-1);
}
/*
* Ethernet header
*/
libnet_build_ethernet(
enet_dst, /* broadcast ethernet address */
e->ether_addr_octet, /* source ethernet address */
ETHERTYPE_ARP, /* this frame holds an ARP packet */
NULL, /* payload */
0, /* payload size */
buf); /* packet header memory */
/*
* ARP header
*/
libnet_build_arp(
ARPHRD_ETHER, /* hardware address type */
ETHERTYPE_IP, /* protocol address type */
ETHER_ADDR_LEN, /* hardware address length */
4, /* protocol address length */
ARPOP_REQUEST, /* packet type - ARP request */
e->ether_addr_octet, /* source (local) ethernet address */
(u_char *)&local_ip, /* source (local) IP address */
enet_dst, /* target's ethernet address (broadcast) */
(u_char *)&ip, /* target's IP address */
NULL, /* payload */
0, /* payload size */
buf + LIBNET_ETH_H); /* packet header memory */
n = libnet_write_link_layer(l, device, buf, LIBNET_ARP_H + LIBNET_ETH_H);
if (n == -1)
{
fprintf(stderr, "libnet_write_link_layer choked\n");
return (-1);
}
printf("Sent a %d byte ARP request looking for the MAC of %s.\n",
n, libnet_host_lookup(ip, 0));
printf("Waiting for a response...\n");
for (;(packet = ((u_char *)pcap_next(pd, &pc_hdr)));)
{
p = (struct libnet_ethernet_hdr *)(packet);
if (ntohs(p->ether_type) == ETHERTYPE_ARP)
{
a = (struct libnet_arp_hdr *)(packet + LIBNET_ETH_H);
if (ntohs(a->ar_op) == ARPOP_REPLY)
{
ip_p = (u_char *)&ip;
if (IP_UCHAR_COMP(a->ar_spa, ip_p))
{
printf("Target hardware address: ");
for (i = 0; i < 6; i++)
{
printf("%x", a->ar_sha[i]);
if (i != 5)
{
printf(":");
}
}
printf("\n");
}
}
}
}
libnet_destroy_packet(&buf);
return (n);
}
/* EOF */
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