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/*
* Copyright 2013 Google Inc.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA.
*/
/*
* Author: ncardwell@google.com (Neal Cardwell)
*
* Link-layer utilities.
*/
#include "link_layer.h"
#include <stdlib.h>
#include <unistd.h>
#include "logging.h"
#ifdef linux
#include <net/if.h>
#include <sys/ioctl.h>
#include "wrap.h"
void get_hw_address(const char *name, struct ether_addr *hw_address,
enum ip_version_t ip_version)
{
u8 *m = NULL;
struct ifreq ifr;
int fd;
DEBUGP("get_hw_address for device %s\n", name);
fd = wrap_socket(ip_version, SOCK_DGRAM);
/* Discover the index of the interface. */
snprintf(ifr.ifr_name, IFNAMSIZ, "%s", name);
if (ioctl(fd, SIOCGIFINDEX, &ifr) < 0)
die_perror("ioctl SIOCGIFINDEX");
/* Get hardware address for the interface. */
if (ioctl(fd, SIOCGIFHWADDR, &ifr) != 0)
die_perror("ioctl SIOCGIFHWADDR");
m = (u8 *)&ifr.ifr_addr.sa_data;
DEBUGP("%s HWaddr: %02x:%02x:%02x:%02x:%02x:%02x\n",
name, m[0], m[1], m[2], m[3], m[4], m[5]);
memcpy(hw_address, m, sizeof(*hw_address));
if (close(fd))
die_perror("close");
}
#else
#if defined(__FreeBSD__) || defined(__OpenBSD__) || defined(__NetBSD__)
#include <net/if_types.h>
#include <net/if_dl.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <ifaddrs.h>
#endif /* defined(__FreeBSD__) || defined(__OpenBSD__) || defined(__NetBSD__) */
void get_hw_address(const char *name, struct ether_addr *hw_address)
{
struct ifaddrs *ifaddrs_list, *ifaddr;
DEBUGP("get_hw_address for device %s\n", name);
if (getifaddrs(&ifaddrs_list) < 0)
die_perror("getifaddrs");
for (ifaddr = ifaddrs_list; ifaddr != NULL; ifaddr = ifaddr->ifa_next) {
if (strcmp(name, ifaddr->ifa_name) == 0 &&
ifaddr->ifa_addr->sa_family == AF_LINK) {
struct sockaddr_dl *sdl;
sdl = (struct sockaddr_dl *)ifaddr->ifa_addr;
if (sdl->sdl_type == IFT_ETHER) {
memcpy(hw_address, LLADDR(sdl),
sizeof(*hw_address));
freeifaddrs(ifaddrs_list);
return;
}
}
}
die("unable to find hw address for %s\n", name);
}
#endif
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