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/*! \file macaddr.c
* MAC address utility routines. */
/*
* (C) 2013-2014 by Harald Welte <laforge@gnumonks.org>
* (C) 2014 by Holger Hans Peter Freyther
*
* All Rights Reserved
*
* 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.
*
*/
/*! \addtogroup utils
* @{
* \file macaddr.c */
#include "config.h"
#include <stdint.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
/*! Parse a MAC address from human-readable notation
* This function parses an ethernet MAC address in the commonly-used
* hex/colon notation (00:00:00:00:00:00) and generates the binary
* representation from it.
* \param[out] out pointer to caller-allocated buffer of 6 bytes
* \param[in] in pointer to input data as string with hex/colon notation
*/
int osmo_macaddr_parse(uint8_t *out, const char *in)
{
/* 00:00:00:00:00:00 */
char tmp[18];
char *tok;
unsigned int i = 0;
if (strlen(in) < 17)
return -1;
strncpy(tmp, in, sizeof(tmp)-1);
tmp[sizeof(tmp)-1] = '\0';
for (tok = strtok(tmp, ":"); tok && (i < 6); tok = strtok(NULL, ":")) {
unsigned long ul = strtoul(tok, NULL, 16);
out[i++] = ul & 0xff;
}
return 0;
}
#if defined(__FreeBSD__) || defined(__APPLE__)
#include <sys/socket.h>
#include <sys/types.h>
#include <ifaddrs.h>
#include <net/if_dl.h>
#include <net/if_types.h>
/*! Obtain the MAC address of a given network device
* \param[out] mac_out pointer to caller-allocated buffer of 6 bytes
* \param[in] dev_name string name of the network device
* \returns 0 in case of success; negative otherwise
*/
int osmo_get_macaddr(uint8_t *mac_out, const char *dev_name)
{
int rc = -1;
struct ifaddrs *ifa, *ifaddr;
if (getifaddrs(&ifaddr) != 0)
return -1;
for (ifa = ifaddr; ifa != NULL; ifa = ifa->ifa_next) {
struct sockaddr_dl *sdl;
sdl = (struct sockaddr_dl *) ifa->ifa_addr;
if (!sdl)
continue;
if (sdl->sdl_family != AF_LINK)
continue;
if (sdl->sdl_type != IFT_ETHER)
continue;
if (strcmp(ifa->ifa_name, dev_name) != 0)
continue;
memcpy(mac_out, LLADDR(sdl), 6);
rc = 0;
break;
}
freeifaddrs(ifaddr);
return 0;
}
#else
#if (!EMBEDDED)
#include <sys/ioctl.h>
#include <net/if.h>
#include <netinet/in.h>
#include <netinet/ip.h>
/*! Obtain the MAC address of a given network device
* \param[out] mac_out pointer to caller-allocated buffer of 6 bytes
* \param[in] dev_name string name of the network device
* \returns 0 in case of success; negative otherwise
*/
int osmo_get_macaddr(uint8_t *mac_out, const char *dev_name)
{
int fd, rc;
struct ifreq ifr;
fd = socket(PF_INET, SOCK_DGRAM, IPPROTO_IP);
if (fd < 0)
return fd;
memset(&ifr, 0, sizeof(ifr));
memcpy(&ifr.ifr_name, dev_name, sizeof(ifr.ifr_name));
rc = ioctl(fd, SIOCGIFHWADDR, &ifr);
close(fd);
if (rc < 0)
return rc;
memcpy(mac_out, ifr.ifr_hwaddr.sa_data, 6);
return 0;
}
#endif /* !EMBEDDED */
#endif
/*! @} */
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