| /* |
| * nameif.c - Naming Interfaces based on MAC address for busybox. |
| * |
| * Writen 2000 by Andi Kleen. |
| * Busybox port 2002 by Nick Fedchik <nick@fedchik.org.ua> |
| * Glenn McGrath <bug1@optushome.com.au> |
| * |
| * 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., 59 Temple Place, Suite 330, Boston, MA |
| * 02111-1307 USA |
| * |
| */ |
| |
| |
| #include <sys/syslog.h> |
| #include <sys/socket.h> |
| #include <sys/ioctl.h> |
| #include <errno.h> |
| #include <getopt.h> |
| #include <stdlib.h> |
| #include <string.h> |
| #include <net/if.h> |
| #include <netinet/ether.h> |
| |
| #include "busybox.h" |
| |
| /* take from linux/sockios.h */ |
| #define SIOCSIFNAME 0x8923 /* set interface name */ |
| |
| /* Octets in one ethernet addr, from <linux/if_ether.h> */ |
| #define ETH_ALEN 6 |
| |
| #ifndef ifr_newname |
| #define ifr_newname ifr_ifru.ifru_slave |
| #endif |
| |
| typedef struct mactable_s { |
| struct mactable_s *next; |
| struct mactable_s *prev; |
| char *ifname; |
| struct ether_addr *mac; |
| } mactable_t; |
| |
| static void serror(const char use_syslog, const char *s, ...) |
| { |
| va_list ap; |
| |
| va_start(ap, s); |
| |
| if (use_syslog) { |
| openlog("nameif", 0, LOG_LOCAL0); |
| syslog(LOG_ERR, s, ap); |
| closelog(); |
| } else { |
| vfprintf(stderr, s, ap); |
| putc('\n', stderr); |
| } |
| |
| va_end(ap); |
| |
| exit(EXIT_FAILURE); |
| } |
| |
| /* Check ascii str_macaddr, convert and copy to *mac */ |
| struct ether_addr *cc_macaddr(char *str_macaddr, unsigned char use_syslog) |
| { |
| struct ether_addr *lmac, *mac; |
| |
| lmac = ether_aton(str_macaddr); |
| if (lmac == NULL) |
| serror(use_syslog, "cannot parse MAC %s", str_macaddr); |
| mac = xcalloc(1, ETH_ALEN); |
| memcpy(mac, lmac, ETH_ALEN); |
| |
| return mac; |
| } |
| |
| int nameif_main(int argc, char **argv) |
| { |
| mactable_t *clist = NULL; |
| FILE *ifh; |
| char *fname = "/etc/mactab"; |
| char *line; |
| unsigned char use_syslog = 0; |
| int ctl_sk = -1; |
| int opt; |
| int if_index = 1; |
| mactable_t *ch = NULL; |
| |
| static struct option opts[] = { |
| {"syslog", 0, NULL, 's'}, |
| {"configfile", 1, NULL, 'c'}, |
| {NULL}, |
| }; |
| |
| while ((opt = getopt_long(argc, argv, "c:s", opts, NULL)) != -1) { |
| switch (opt) { |
| case 'c': |
| fname = optarg; |
| break; |
| case 's': |
| use_syslog = 1; |
| break; |
| default: |
| show_usage(); |
| } |
| } |
| |
| if ((argc - optind) & 1) |
| show_usage(); |
| |
| if (optind < argc) { |
| while (optind < argc) { |
| |
| if (strlen(argv[optind]) > IF_NAMESIZE) |
| serror(use_syslog, "interface name `%s' too long", |
| argv[optind]); |
| optind++; |
| |
| ch = xcalloc(1, sizeof(mactable_t)); |
| ch->next = NULL; |
| ch->prev = NULL; |
| ch->ifname = strdup(argv[optind - 1]); |
| ch->mac = cc_macaddr(argv[optind], use_syslog); |
| optind++; |
| if (clist) |
| clist->prev = ch->next; |
| ch->next = clist; |
| ch->prev = clist; |
| clist = ch; |
| } |
| } else { |
| ifh = xfopen(fname, "r"); |
| |
| while ((line = get_line_from_file(ifh)) != NULL) { |
| char *line_ptr; |
| unsigned short name_length; |
| |
| line_ptr = line + strspn(line, " \t"); |
| if ((line_ptr[0] == '#') || (line_ptr[0] == '\n')) |
| continue; |
| name_length = strcspn(line_ptr, " \t"); |
| if (name_length > IF_NAMESIZE) |
| serror(use_syslog, "interface name `%s' too long", |
| argv[optind]); |
| ch = xcalloc(1, sizeof(mactable_t)); |
| ch->next = NULL; |
| ch->prev = NULL; |
| ch->ifname = strndup(line_ptr, name_length); |
| line_ptr += name_length; |
| line_ptr += strspn(line_ptr, " \t"); |
| name_length = strspn(line_ptr, "0123456789ABCDEFabcdef:"); |
| line_ptr[name_length] = '\0'; |
| ch->mac = cc_macaddr(line_ptr, use_syslog); |
| if (clist) |
| clist->prev = ch; |
| ch->next = clist; |
| clist = ch; |
| free(line); |
| } |
| fclose(ifh); |
| } |
| |
| if ((ctl_sk = socket(PF_INET, SOCK_DGRAM, 0)) == -1) |
| serror(use_syslog, "socket: %s", strerror(errno)); |
| |
| while (clist) { |
| struct ifreq ifr; |
| |
| bzero(&ifr, sizeof(struct ifreq)); |
| if_index++; |
| ifr.ifr_ifindex = if_index; |
| |
| /* Get ifname by index or die */ |
| if (ioctl(ctl_sk, SIOCGIFNAME, &ifr)) |
| break; |
| |
| /* Has this device hwaddr? */ |
| if (ioctl(ctl_sk, SIOCGIFHWADDR, &ifr)) |
| continue; |
| |
| /* Search for mac like in ifr.ifr_hwaddr.sa_data */ |
| for (ch = clist; ch; ch = ch->next) |
| if (!memcmp(ch->mac, ifr.ifr_hwaddr.sa_data, ETH_ALEN)) |
| break; |
| |
| /* Nothing found for current ifr.ifr_hwaddr.sa_data */ |
| if (ch == NULL) |
| continue; |
| |
| strcpy(ifr.ifr_newname, ch->ifname); |
| if (ioctl(ctl_sk, SIOCSIFNAME, &ifr) < 0) |
| serror(use_syslog, "cannot change ifname %s to %s: %s", |
| ifr.ifr_name, ch->ifname, strerror(errno)); |
| |
| /* Remove list entry of renamed interface */ |
| if (ch->prev != NULL) { |
| (ch->prev)->next = ch->next; |
| } else { |
| clist = ch->next; |
| } |
| if (ch->next != NULL) |
| (ch->next)->prev = ch->prev; |
| free(ch); |
| } |
| |
| while (clist) { |
| ch = clist; |
| clist = clist->next; |
| free(ch); |
| } |
| |
| return 0; |
| } |