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Diffstat (limited to 'src/core/macaddr.c')
| -rw-r--r-- | src/core/macaddr.c | 149 |
1 files changed, 149 insertions, 0 deletions
diff --git a/src/core/macaddr.c b/src/core/macaddr.c new file mode 100644 index 00000000..3b231fb8 --- /dev/null +++ b/src/core/macaddr.c @@ -0,0 +1,149 @@ +/*! \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 + * + * SPDX-License-Identifier: GPL-2.0+ + * + * 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. + * + */ + +/*! \addtogroup utils + * @{ + * \file macaddr.c */ + +#include "config.h" + +#include <stdint.h> +#include <string.h> +#include <stdlib.h> +#include <unistd.h> +#include <errno.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) +{ + struct ifaddrs *ifa, *ifaddr; + int rc = -ENODEV; + + if (getifaddrs(&ifaddr) != 0) + return -errno; + + 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 rc; +} + +#else + +#if (!EMBEDDED) + +#include <sys/ioctl.h> +#include <net/if.h> +#include <netinet/in.h> +#include <netinet/ip.h> +#include <errno.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, dev_len; + struct ifreq ifr; + + dev_len = strlen(dev_name); + if (dev_len >= sizeof(ifr.ifr_name)) + return -EINVAL; + + fd = socket(PF_INET, SOCK_DGRAM, IPPROTO_IP); + if (fd < 0) + return fd; + + memset(&ifr, 0, sizeof(ifr)); + memcpy(&ifr.ifr_name, dev_name, dev_len + 1); + 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 + +/*! @} */ |