mirror of https://gerrit.osmocom.org/libosmocore
153 lines
3.6 KiB
C
153 lines
3.6 KiB
C
/*! \file macaddr.c
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* MAC address utility routines. */
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/*
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* (C) 2013-2014 by Harald Welte <laforge@gnumonks.org>
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* (C) 2014 by Holger Hans Peter Freyther
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*
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* All Rights Reserved
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*
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* SPDX-License-Identifier: GPL-2.0+
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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*/
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/*! \addtogroup utils
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* @{
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* \file macaddr.c */
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#include "config.h"
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#include <stdint.h>
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#include <string.h>
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#include <stdlib.h>
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#include <unistd.h>
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/*! Parse a MAC address from human-readable notation
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* This function parses an ethernet MAC address in the commonly-used
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* hex/colon notation (00:00:00:00:00:00) and generates the binary
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* representation from it.
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* \param[out] out pointer to caller-allocated buffer of 6 bytes
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* \param[in] in pointer to input data as string with hex/colon notation
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*/
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int osmo_macaddr_parse(uint8_t *out, const char *in)
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{
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/* 00:00:00:00:00:00 */
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char tmp[18];
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char *tok;
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unsigned int i = 0;
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if (strlen(in) < 17)
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return -1;
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strncpy(tmp, in, sizeof(tmp)-1);
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tmp[sizeof(tmp)-1] = '\0';
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for (tok = strtok(tmp, ":"); tok && (i < 6); tok = strtok(NULL, ":")) {
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unsigned long ul = strtoul(tok, NULL, 16);
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out[i++] = ul & 0xff;
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}
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return 0;
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}
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#if defined(__FreeBSD__) || defined(__APPLE__)
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#include <sys/socket.h>
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#include <sys/types.h>
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#include <ifaddrs.h>
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#include <net/if_dl.h>
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#include <net/if_types.h>
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/*! Obtain the MAC address of a given network device
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* \param[out] mac_out pointer to caller-allocated buffer of 6 bytes
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* \param[in] dev_name string name of the network device
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* \returns 0 in case of success; negative otherwise
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*/
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int osmo_get_macaddr(uint8_t *mac_out, const char *dev_name)
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{
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int rc = -1;
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struct ifaddrs *ifa, *ifaddr;
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if (getifaddrs(&ifaddr) != 0)
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return -1;
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for (ifa = ifaddr; ifa != NULL; ifa = ifa->ifa_next) {
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struct sockaddr_dl *sdl;
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sdl = (struct sockaddr_dl *) ifa->ifa_addr;
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if (!sdl)
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continue;
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if (sdl->sdl_family != AF_LINK)
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continue;
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if (sdl->sdl_type != IFT_ETHER)
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continue;
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if (strcmp(ifa->ifa_name, dev_name) != 0)
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continue;
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memcpy(mac_out, LLADDR(sdl), 6);
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rc = 0;
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break;
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}
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freeifaddrs(ifaddr);
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return 0;
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}
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#else
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#if (!EMBEDDED)
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#include <sys/ioctl.h>
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#include <net/if.h>
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#include <netinet/in.h>
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#include <netinet/ip.h>
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#include <errno.h>
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/*! Obtain the MAC address of a given network device
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* \param[out] mac_out pointer to caller-allocated buffer of 6 bytes
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* \param[in] dev_name string name of the network device
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* \returns 0 in case of success; negative otherwise
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*/
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int osmo_get_macaddr(uint8_t *mac_out, const char *dev_name)
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{
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int fd, rc, dev_len;
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struct ifreq ifr;
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dev_len = strlen(dev_name);
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if (dev_len >= sizeof(ifr.ifr_name))
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return -EINVAL;
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fd = socket(PF_INET, SOCK_DGRAM, IPPROTO_IP);
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if (fd < 0)
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return fd;
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memset(&ifr, 0, sizeof(ifr));
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memcpy(&ifr.ifr_name, dev_name, dev_len + 1);
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rc = ioctl(fd, SIOCGIFHWADDR, &ifr);
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close(fd);
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if (rc < 0)
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return rc;
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memcpy(mac_out, ifr.ifr_hwaddr.sa_data, 6);
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return 0;
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}
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#endif /* !EMBEDDED */
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#endif
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/*! @} */
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