1 /* vi: set sw=4 ts=4: */
3 * nameif.c - Naming Interfaces based on MAC address for busybox.
5 * Written 2000 by Andi Kleen.
6 * Busybox port 2002 by Nick Fedchik <nick@fedchik.org.ua>
9 * Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
15 #include <netinet/ether.h>
18 /* Older versions of net/if.h do not appear to define IF_NAMESIZE. */
21 # define IF_NAMESIZE IFNAMSIZ
23 # define IF_NAMESIZE 16
27 /* take from linux/sockios.h */
28 #define SIOCSIFNAME 0x8923 /* set interface name */
30 /* Octets in one Ethernet addr, from <linux/if_ether.h> */
34 #define ifr_newname ifr_ifru.ifru_slave
37 typedef struct mactable_s {
38 struct mactable_s *next;
39 struct mactable_s *prev;
41 struct ether_addr *mac;
44 /* Check ascii str_macaddr, convert and copy to *mac */
45 static struct ether_addr *cc_macaddr(const char *str_macaddr)
47 struct ether_addr *lmac, *mac;
49 lmac = ether_aton(str_macaddr);
51 bb_error_msg_and_die("cannot parse MAC %s", str_macaddr);
52 mac = xmalloc(ETH_ALEN);
53 memcpy(mac, lmac, ETH_ALEN);
58 int nameif_main(int argc, char **argv);
59 int nameif_main(int argc, char **argv)
61 mactable_t *clist = NULL;
63 const char *fname = "/etc/mactab";
69 if (1 & getopt32(argv, "sc:", &fname)) {
70 openlog(applet_name, 0, LOG_LOCAL0);
71 logmode = LOGMODE_SYSLOG;
74 if ((argc - optind) & 1)
78 char **a = argv + optind;
81 if (strlen(*a) > IF_NAMESIZE)
82 bb_error_msg_and_die("interface name '%s' "
84 ch = xzalloc(sizeof(mactable_t));
85 ch->ifname = xstrdup(*a++);
86 ch->mac = cc_macaddr(*a++);
93 ifh = xfopen(fname, "r");
95 while ((line = xmalloc_fgets(ifh)) != NULL) {
99 line_ptr = line + strspn(line, " \t");
100 if ((line_ptr[0] == '#') || (line_ptr[0] == '\n')) {
104 name_length = strcspn(line_ptr, " \t");
105 ch = xzalloc(sizeof(mactable_t));
106 ch->ifname = xstrndup(line_ptr, name_length);
107 if (name_length > IF_NAMESIZE)
108 bb_error_msg_and_die("interface name '%s' "
109 "too long", ch->ifname);
110 line_ptr += name_length;
111 line_ptr += strspn(line_ptr, " \t");
112 name_length = strspn(line_ptr, "0123456789ABCDEFabcdef:");
113 line_ptr[name_length] = '\0';
114 ch->mac = cc_macaddr(line_ptr);
124 ctl_sk = xsocket(PF_INET, SOCK_DGRAM, 0);
129 memset(&ifr, 0, sizeof(struct ifreq));
131 ifr.ifr_ifindex = if_index;
133 /* Get ifname by index or die */
134 if (ioctl(ctl_sk, SIOCGIFNAME, &ifr))
137 /* Has this device hwaddr? */
138 if (ioctl(ctl_sk, SIOCGIFHWADDR, &ifr))
141 /* Search for mac like in ifr.ifr_hwaddr.sa_data */
142 for (ch = clist; ch; ch = ch->next)
143 if (!memcmp(ch->mac, ifr.ifr_hwaddr.sa_data, ETH_ALEN))
146 /* Nothing found for current ifr.ifr_hwaddr.sa_data */
150 strcpy(ifr.ifr_newname, ch->ifname);
151 ioctl_or_perror_and_die(ctl_sk, SIOCSIFNAME, &ifr,
152 "cannot change ifname %s to %s",
153 ifr.ifr_name, ch->ifname);
155 /* Remove list entry of renamed interface */
156 if (ch->prev != NULL) {
157 (ch->prev)->next = ch->next;
161 if (ch->next != NULL)
162 (ch->next)->prev = ch->prev;
163 if (ENABLE_FEATURE_CLEAN_UP) {