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172 lines
3.8 KiB
C
172 lines
3.8 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* nameif.c - Naming Interfaces based on MAC address for busybox.
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*
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* Written 2000 by Andi Kleen.
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* Busybox port 2002 by Nick Fedchik <nick@fedchik.org.ua>
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* Glenn McGrath
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*
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* Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
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*/
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#include "libbb.h"
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#include <syslog.h>
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#include <net/if.h>
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#include <netinet/ether.h>
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/* Older versions of net/if.h do not appear to define IF_NAMESIZE. */
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#ifndef IF_NAMESIZE
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# ifdef IFNAMSIZ
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# define IF_NAMESIZE IFNAMSIZ
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# else
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# define IF_NAMESIZE 16
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# endif
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#endif
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/* take from linux/sockios.h */
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#define SIOCSIFNAME 0x8923 /* set interface name */
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/* Octets in one Ethernet addr, from <linux/if_ether.h> */
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#define ETH_ALEN 6
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#ifndef ifr_newname
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#define ifr_newname ifr_ifru.ifru_slave
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#endif
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typedef struct mactable_s {
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struct mactable_s *next;
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struct mactable_s *prev;
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char *ifname;
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struct ether_addr *mac;
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} mactable_t;
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/* Check ascii str_macaddr, convert and copy to *mac */
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static struct ether_addr *cc_macaddr(const char *str_macaddr)
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{
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struct ether_addr *lmac, *mac;
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lmac = ether_aton(str_macaddr);
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if (lmac == NULL)
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bb_error_msg_and_die("cannot parse MAC %s", str_macaddr);
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mac = xmalloc(ETH_ALEN);
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memcpy(mac, lmac, ETH_ALEN);
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return mac;
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}
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int nameif_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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int nameif_main(int argc, char **argv)
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{
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mactable_t *clist = NULL;
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FILE *ifh;
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const char *fname = "/etc/mactab";
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char *line;
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int ctl_sk;
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int if_index = 1;
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mactable_t *ch;
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if (1 & getopt32(argv, "sc:", &fname)) {
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openlog(applet_name, 0, LOG_LOCAL0);
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logmode = LOGMODE_SYSLOG;
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}
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if ((argc - optind) & 1)
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bb_show_usage();
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if (optind < argc) {
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char **a = argv + optind;
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while (*a) {
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if (strlen(*a) > IF_NAMESIZE)
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bb_error_msg_and_die("interface name '%s' "
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"too long", *a);
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ch = xzalloc(sizeof(mactable_t));
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ch->ifname = xstrdup(*a++);
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ch->mac = cc_macaddr(*a++);
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if (clist)
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clist->prev = ch;
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ch->next = clist;
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clist = ch;
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}
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} else {
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ifh = xfopen(fname, "r");
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while ((line = xmalloc_fgets(ifh)) != NULL) {
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char *line_ptr;
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size_t name_length;
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line_ptr = line + strspn(line, " \t");
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if ((line_ptr[0] == '#') || (line_ptr[0] == '\n')) {
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free(line);
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continue;
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}
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name_length = strcspn(line_ptr, " \t");
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ch = xzalloc(sizeof(mactable_t));
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ch->ifname = xstrndup(line_ptr, name_length);
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if (name_length > IF_NAMESIZE)
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bb_error_msg_and_die("interface name '%s' "
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"too long", ch->ifname);
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line_ptr += name_length;
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line_ptr += strspn(line_ptr, " \t");
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name_length = strspn(line_ptr, "0123456789ABCDEFabcdef:");
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line_ptr[name_length] = '\0';
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ch->mac = cc_macaddr(line_ptr);
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if (clist)
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clist->prev = ch;
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ch->next = clist;
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clist = ch;
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free(line);
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}
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fclose(ifh);
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}
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ctl_sk = xsocket(PF_INET, SOCK_DGRAM, 0);
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while (clist) {
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struct ifreq ifr;
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memset(&ifr, 0, sizeof(struct ifreq));
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if_index++;
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ifr.ifr_ifindex = if_index;
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/* Get ifname by index or die */
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if (ioctl(ctl_sk, SIOCGIFNAME, &ifr))
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break;
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/* Has this device hwaddr? */
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if (ioctl(ctl_sk, SIOCGIFHWADDR, &ifr))
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continue;
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/* Search for mac like in ifr.ifr_hwaddr.sa_data */
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for (ch = clist; ch; ch = ch->next)
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if (!memcmp(ch->mac, ifr.ifr_hwaddr.sa_data, ETH_ALEN))
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break;
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/* Nothing found for current ifr.ifr_hwaddr.sa_data */
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if (ch == NULL)
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continue;
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strcpy(ifr.ifr_newname, ch->ifname);
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ioctl_or_perror_and_die(ctl_sk, SIOCSIFNAME, &ifr,
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"cannot change ifname %s to %s",
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ifr.ifr_name, ch->ifname);
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/* Remove list entry of renamed interface */
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if (ch->prev != NULL) {
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(ch->prev)->next = ch->next;
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} else {
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clist = ch->next;
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}
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if (ch->next != NULL)
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(ch->next)->prev = ch->prev;
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if (ENABLE_FEATURE_CLEAN_UP) {
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free(ch->ifname);
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free(ch->mac);
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free(ch);
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}
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}
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return 0;
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}
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