2 * nameif.c - Naming Interfaces based on MAC address for busybox.
4 * Writen 2000 by Andi Kleen.
5 * Busybox port 2002 by Nick Fedchik <nick@fedchik.org.ua>
6 * Glenn McGrath <bug1@optushome.com.au>
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
26 #include <sys/syslog.h>
27 #include <sys/socket.h>
28 #include <sys/ioctl.h>
34 #include <netinet/ether.h>
35 #include <linux/sockios.h>
39 /* Octets in one ethernet addr, from <linux/if_ether.h> */
43 #define ifr_newname ifr_ifru.ifru_slave
46 typedef struct mactable_s {
47 struct mactable_s *next;
48 struct mactable_s *prev;
50 struct ether_addr *mac;
53 static void serror(const char use_syslog, const char *s, ...)
60 openlog("nameif", 0, LOG_LOCAL0);
61 syslog(LOG_ERR, s, ap);
64 vfprintf(stderr, s, ap);
73 /* Check ascii str_macaddr, convert and copy to *mac */
74 struct ether_addr *cc_macaddr(char *str_macaddr, unsigned char use_syslog)
76 struct ether_addr *lmac, *mac;
78 lmac = ether_aton(str_macaddr);
80 serror(use_syslog, "cannot parse MAC %s", str_macaddr);
81 mac = xcalloc(1, ETH_ALEN);
82 memcpy(mac, lmac, ETH_ALEN);
87 int nameif_main(int argc, char **argv)
89 mactable_t *clist = NULL;
91 char *fname = "/etc/mactab";
93 unsigned char use_syslog = 0;
97 mactable_t *ch = NULL;
99 static struct option opts[] = {
100 {"syslog", 0, NULL, 's'},
101 {"configfile", 1, NULL, 'c'},
105 while ((opt = getopt_long(argc, argv, "c:s", opts, NULL)) != -1) {
118 if ((argc - optind) & 1)
122 while (optind < argc) {
124 if (strlen(argv[optind]) > IF_NAMESIZE)
125 serror(use_syslog, "interface name `%s' too long",
129 ch = xcalloc(1, sizeof(mactable_t));
132 ch->ifname = strdup(argv[optind - 1]);
133 ch->mac = cc_macaddr(argv[optind], use_syslog);
136 clist->prev = ch->next;
142 ifh = xfopen(fname, "r");
144 while ((line = get_line_from_file(ifh)) != NULL) {
146 unsigned short name_length;
148 line_ptr = line + strspn(line, " \t");
149 if ((line_ptr[0] == '#') || (line_ptr[0] == '\n'))
151 name_length = strcspn(line_ptr, " \t");
152 if (name_length > IF_NAMESIZE)
153 serror(use_syslog, "interface name `%s' too long",
155 ch = xcalloc(1, sizeof(mactable_t));
158 ch->ifname = strndup(line_ptr, name_length);
159 line_ptr += name_length;
160 line_ptr += strspn(line_ptr, " \t");
161 name_length = strspn(line_ptr, "0123456789ABCDEFabcdef:");
162 line_ptr[name_length] = '\0';
163 ch->mac = cc_macaddr(line_ptr, use_syslog);
173 if ((ctl_sk = socket(PF_INET, SOCK_DGRAM, 0)) == -1)
174 serror(use_syslog, "socket: %s", strerror(errno));
179 bzero(&ifr, sizeof(struct ifreq));
181 ifr.ifr_ifindex = if_index;
183 /* Get ifname by index or die */
184 if (ioctl(ctl_sk, SIOCGIFNAME, &ifr))
187 /* Has this device hwaddr? */
188 if (ioctl(ctl_sk, SIOCGIFHWADDR, &ifr))
191 /* Search for mac like in ifr.ifr_hwaddr.sa_data */
192 for (ch = clist; ch; ch = ch->next)
193 if (!memcmp(ch->mac, ifr.ifr_hwaddr.sa_data, ETH_ALEN))
196 /* Nothing found for current ifr.ifr_hwaddr.sa_data */
200 strcpy(ifr.ifr_newname, ch->ifname);
201 if (ioctl(ctl_sk, SIOCSIFNAME, &ifr) < 0)
202 serror(use_syslog, "cannot change ifname %s to %s: %s",
203 ifr.ifr_name, ch->ifname, strerror(errno));
205 /* Remove list entry of renamed interface */
206 if (ch->prev != NULL) {
207 (ch->prev)->next = ch->next;
211 if (ch->next != NULL)
212 (ch->next)->prev = ch->prev;