Neels Hofmeyr | 17518fe | 2017-06-20 04:35:06 +0200 | [diff] [blame] | 1 | /*! \file macaddr.c |
| 2 | * MAC address utility routines. */ |
Harald Welte | 468b643 | 2014-09-11 13:05:51 +0800 | [diff] [blame] | 3 | /* |
| 4 | * (C) 2013-2014 by Harald Welte <laforge@gnumonks.org> |
| 5 | * (C) 2014 by Holger Hans Peter Freyther |
| 6 | * |
| 7 | * All Rights Reserved |
| 8 | * |
Harald Welte | e08da97 | 2017-11-13 01:00:26 +0900 | [diff] [blame] | 9 | * SPDX-License-Identifier: GPL-2.0+ |
| 10 | * |
Harald Welte | 468b643 | 2014-09-11 13:05:51 +0800 | [diff] [blame] | 11 | * This program is free software; you can redistribute it and/or modify |
| 12 | * it under the terms of the GNU General Public License as published by |
| 13 | * the Free Software Foundation; either version 2 of the License, or |
| 14 | * (at your option) any later version. |
| 15 | * |
| 16 | * This program is distributed in the hope that it will be useful, |
| 17 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 18 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 19 | * GNU General Public License for more details. |
| 20 | * |
Harald Welte | 468b643 | 2014-09-11 13:05:51 +0800 | [diff] [blame] | 21 | */ |
| 22 | |
Harald Welte | 2d2e2cc | 2016-04-25 12:11:20 +0200 | [diff] [blame] | 23 | /*! \addtogroup utils |
| 24 | * @{ |
Neels Hofmeyr | 17518fe | 2017-06-20 04:35:06 +0200 | [diff] [blame] | 25 | * \file macaddr.c */ |
Harald Welte | 2d2e2cc | 2016-04-25 12:11:20 +0200 | [diff] [blame] | 26 | |
Harald Welte | 44c0f63 | 2017-01-15 17:58:29 +0100 | [diff] [blame] | 27 | #include "config.h" |
| 28 | |
Harald Welte | 40d56f9 | 2014-08-18 19:03:40 +0200 | [diff] [blame] | 29 | #include <stdint.h> |
| 30 | #include <string.h> |
| 31 | #include <stdlib.h> |
Harald Welte | 78b0868 | 2014-08-21 02:37:57 +0200 | [diff] [blame] | 32 | #include <unistd.h> |
Vadim Yanitskiy | f76f21b | 2020-08-27 01:10:51 +0700 | [diff] [blame] | 33 | #include <errno.h> |
Harald Welte | 40d56f9 | 2014-08-18 19:03:40 +0200 | [diff] [blame] | 34 | |
Neels Hofmeyr | 87e4550 | 2017-06-20 00:17:59 +0200 | [diff] [blame] | 35 | /*! Parse a MAC address from human-readable notation |
Harald Welte | 2d2e2cc | 2016-04-25 12:11:20 +0200 | [diff] [blame] | 36 | * This function parses an ethernet MAC address in the commonly-used |
| 37 | * hex/colon notation (00:00:00:00:00:00) and generates the binary |
| 38 | * representation from it. |
| 39 | * \param[out] out pointer to caller-allocated buffer of 6 bytes |
| 40 | * \param[in] in pointer to input data as string with hex/colon notation |
| 41 | */ |
Harald Welte | 40d56f9 | 2014-08-18 19:03:40 +0200 | [diff] [blame] | 42 | int osmo_macaddr_parse(uint8_t *out, const char *in) |
| 43 | { |
| 44 | /* 00:00:00:00:00:00 */ |
| 45 | char tmp[18]; |
| 46 | char *tok; |
| 47 | unsigned int i = 0; |
| 48 | |
| 49 | if (strlen(in) < 17) |
| 50 | return -1; |
| 51 | |
| 52 | strncpy(tmp, in, sizeof(tmp)-1); |
| 53 | tmp[sizeof(tmp)-1] = '\0'; |
| 54 | |
| 55 | for (tok = strtok(tmp, ":"); tok && (i < 6); tok = strtok(NULL, ":")) { |
| 56 | unsigned long ul = strtoul(tok, NULL, 16); |
| 57 | out[i++] = ul & 0xff; |
| 58 | } |
| 59 | |
| 60 | return 0; |
| 61 | } |
Harald Welte | fe3e42b | 2014-08-18 19:19:45 +0200 | [diff] [blame] | 62 | |
Holger Hans Peter Freyther | 1885395 | 2015-04-11 19:29:52 +0200 | [diff] [blame] | 63 | #if defined(__FreeBSD__) || defined(__APPLE__) |
Holger Hans Peter Freyther | efe0100 | 2014-08-21 14:14:38 +0200 | [diff] [blame] | 64 | #include <sys/socket.h> |
| 65 | #include <sys/types.h> |
| 66 | #include <ifaddrs.h> |
| 67 | #include <net/if_dl.h> |
| 68 | #include <net/if_types.h> |
| 69 | |
Neels Hofmeyr | 87e4550 | 2017-06-20 00:17:59 +0200 | [diff] [blame] | 70 | /*! Obtain the MAC address of a given network device |
Harald Welte | 2d2e2cc | 2016-04-25 12:11:20 +0200 | [diff] [blame] | 71 | * \param[out] mac_out pointer to caller-allocated buffer of 6 bytes |
| 72 | * \param[in] dev_name string name of the network device |
| 73 | * \returns 0 in case of success; negative otherwise |
| 74 | */ |
Holger Hans Peter Freyther | efe0100 | 2014-08-21 14:14:38 +0200 | [diff] [blame] | 75 | int osmo_get_macaddr(uint8_t *mac_out, const char *dev_name) |
| 76 | { |
Holger Hans Peter Freyther | efe0100 | 2014-08-21 14:14:38 +0200 | [diff] [blame] | 77 | struct ifaddrs *ifa, *ifaddr; |
Vadim Yanitskiy | f76f21b | 2020-08-27 01:10:51 +0700 | [diff] [blame] | 78 | int rc = -ENODEV; |
Holger Hans Peter Freyther | efe0100 | 2014-08-21 14:14:38 +0200 | [diff] [blame] | 79 | |
| 80 | if (getifaddrs(&ifaddr) != 0) |
Vadim Yanitskiy | f76f21b | 2020-08-27 01:10:51 +0700 | [diff] [blame] | 81 | return -errno; |
Holger Hans Peter Freyther | efe0100 | 2014-08-21 14:14:38 +0200 | [diff] [blame] | 82 | |
| 83 | for (ifa = ifaddr; ifa != NULL; ifa = ifa->ifa_next) { |
| 84 | struct sockaddr_dl *sdl; |
| 85 | |
| 86 | sdl = (struct sockaddr_dl *) ifa->ifa_addr; |
| 87 | if (!sdl) |
| 88 | continue; |
| 89 | if (sdl->sdl_family != AF_LINK) |
| 90 | continue; |
| 91 | if (sdl->sdl_type != IFT_ETHER) |
| 92 | continue; |
| 93 | if (strcmp(ifa->ifa_name, dev_name) != 0) |
| 94 | continue; |
| 95 | |
| 96 | memcpy(mac_out, LLADDR(sdl), 6); |
| 97 | rc = 0; |
| 98 | break; |
| 99 | } |
| 100 | |
| 101 | freeifaddrs(ifaddr); |
Vadim Yanitskiy | a751f77 | 2020-08-27 01:04:59 +0700 | [diff] [blame] | 102 | return rc; |
Holger Hans Peter Freyther | efe0100 | 2014-08-21 14:14:38 +0200 | [diff] [blame] | 103 | } |
| 104 | |
| 105 | #else |
| 106 | |
Harald Welte | 44c0f63 | 2017-01-15 17:58:29 +0100 | [diff] [blame] | 107 | #if (!EMBEDDED) |
| 108 | |
Harald Welte | fe3e42b | 2014-08-18 19:19:45 +0200 | [diff] [blame] | 109 | #include <sys/ioctl.h> |
| 110 | #include <net/if.h> |
Harald Welte | e15ac06 | 2014-12-04 14:15:36 +0100 | [diff] [blame] | 111 | #include <netinet/in.h> |
Harald Welte | fe3e42b | 2014-08-18 19:19:45 +0200 | [diff] [blame] | 112 | #include <netinet/ip.h> |
Pau Espin Pedrol | 8fb4586 | 2018-04-17 17:58:24 +0200 | [diff] [blame] | 113 | #include <errno.h> |
Harald Welte | fe3e42b | 2014-08-18 19:19:45 +0200 | [diff] [blame] | 114 | |
Neels Hofmeyr | 87e4550 | 2017-06-20 00:17:59 +0200 | [diff] [blame] | 115 | /*! Obtain the MAC address of a given network device |
Harald Welte | 2d2e2cc | 2016-04-25 12:11:20 +0200 | [diff] [blame] | 116 | * \param[out] mac_out pointer to caller-allocated buffer of 6 bytes |
| 117 | * \param[in] dev_name string name of the network device |
| 118 | * \returns 0 in case of success; negative otherwise |
| 119 | */ |
Harald Welte | fe3e42b | 2014-08-18 19:19:45 +0200 | [diff] [blame] | 120 | int osmo_get_macaddr(uint8_t *mac_out, const char *dev_name) |
| 121 | { |
Pau Espin Pedrol | 8fb4586 | 2018-04-17 17:58:24 +0200 | [diff] [blame] | 122 | int fd, rc, dev_len; |
Harald Welte | fe3e42b | 2014-08-18 19:19:45 +0200 | [diff] [blame] | 123 | struct ifreq ifr; |
| 124 | |
Pau Espin Pedrol | 8fb4586 | 2018-04-17 17:58:24 +0200 | [diff] [blame] | 125 | dev_len = strlen(dev_name); |
| 126 | if (dev_len >= sizeof(ifr.ifr_name)) |
| 127 | return -EINVAL; |
| 128 | |
Harald Welte | fe3e42b | 2014-08-18 19:19:45 +0200 | [diff] [blame] | 129 | fd = socket(PF_INET, SOCK_DGRAM, IPPROTO_IP); |
| 130 | if (fd < 0) |
| 131 | return fd; |
| 132 | |
| 133 | memset(&ifr, 0, sizeof(ifr)); |
Pau Espin Pedrol | 8fb4586 | 2018-04-17 17:58:24 +0200 | [diff] [blame] | 134 | memcpy(&ifr.ifr_name, dev_name, dev_len + 1); |
Harald Welte | fe3e42b | 2014-08-18 19:19:45 +0200 | [diff] [blame] | 135 | rc = ioctl(fd, SIOCGIFHWADDR, &ifr); |
| 136 | close(fd); |
| 137 | |
| 138 | if (rc < 0) |
| 139 | return rc; |
| 140 | |
| 141 | memcpy(mac_out, ifr.ifr_hwaddr.sa_data, 6); |
| 142 | |
| 143 | return 0; |
| 144 | } |
Harald Welte | 44c0f63 | 2017-01-15 17:58:29 +0100 | [diff] [blame] | 145 | #endif /* !EMBEDDED */ |
| 146 | |
Holger Hans Peter Freyther | efe0100 | 2014-08-21 14:14:38 +0200 | [diff] [blame] | 147 | #endif |
Harald Welte | 2d2e2cc | 2016-04-25 12:11:20 +0200 | [diff] [blame] | 148 | |
| 149 | /*! @} */ |