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/*
* 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"
/* set interface name, from <linux/sockios.h> */
#define SIOCSIFNAME 0x8923
/* 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 **pprev;
char *ifname;
struct ether_addr *mac;
} mactable_t;
static void serror_msg_and_die(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);
}
int nameif_main(int argc, char **argv)
{
mactable_t *clist = NULL;
FILE *ifh;
char *fname = "/etc/mactab";
char *line;
unsigned short linenum = 0;
unsigned char use_syslog = 0;
int ctl_sk = -1;
int opt;
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) {
struct ether_addr *mac;
mactable_t *ch;
if (strlen(argv[optind]) > IF_NAMESIZE) {
serror_msg_and_die(use_syslog, "interface name `%s' too long", argv[optind]);
}
optind++;
mac = ether_aton(argv[optind]);
if (mac == NULL) {
serror_msg_and_die(use_syslog, "cannot parse MAC %s", argv[optind]);
}
ch = xcalloc(1, sizeof(mactable_t));
ch->ifname = strdup(argv[optind - 1]);
ch->mac = xcalloc(1, ETH_ALEN);
memcpy(ch->mac, &mac, ETH_ALEN);
optind++;
if (clist)
clist->pprev = &ch->next;
ch->next = clist;
ch->pprev = &clist;
clist = ch;
}
} else {
ifh = xfopen(fname, "r");
while ((line = get_line_from_file(ifh)) != NULL) {
struct ether_addr *mac;
mactable_t *ch;
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_msg_and_die(use_syslog, "interface name `%s' too long", argv[optind]);
}
ch = xcalloc(1, sizeof(mactable_t));
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';
mac = ether_aton(line_ptr);
if (mac == NULL) {
serror_msg_and_die(use_syslog, "cannot parse MAC %s", argv[optind]);
}
ch->mac = xcalloc(1, ETH_ALEN);
memcpy(ch->mac, mac, ETH_ALEN);
if (clist)
clist->pprev = &ch->next;
ch->next = clist;
ch->pprev = &clist;
clist = ch;
free(line);
}
fclose(ifh);
}
ifh = xfopen("/proc/net/dev", "r");
while ((line = get_line_from_file(ifh)) != NULL) {
char *line_ptr;
unsigned short iface_name_length;
struct ifreq ifr;
mactable_t *ch = NULL;
linenum++;
if (linenum < 3)
continue;
line_ptr = line + strspn(line, " \t");
if (line_ptr[0] == '\n')
continue;
iface_name_length = strcspn(line_ptr, ":");
if (ctl_sk < 0)
ctl_sk = socket(PF_INET, SOCK_DGRAM, 0);
memset(&ifr, 0, sizeof(struct ifreq));
strncpy(ifr.ifr_name, line_ptr, iface_name_length);
if (ioctl(ctl_sk, SIOCGIFHWADDR, &ifr) < 0) {
serror_msg_and_die(use_syslog, "cannot change name of %s to %s: %s", ifr.ifr_name, ch->ifname, strerror(errno));
}
for (ch = clist; ch; ch = ch->next)
if (!memcmp(ch->mac, ifr.ifr_hwaddr.sa_data, ETH_ALEN))
break;
if (ch == NULL) {
continue;
}
strcpy(ifr.ifr_newname, ch->ifname);
if (ioctl(ctl_sk, SIOCSIFNAME, &ifr) < 0) {;
serror_msg_and_die(use_syslog, "cannot change name of %s to %s: %s", ifr.ifr_name, ch->ifname, strerror(errno));
}
*ch->pprev = ch->next;
free(ch);
free(line);
}
fclose(ifh);
while (clist) {
mactable_t *ch;
ch = clist;
clist = clist->next;
free(ch);
}
return 0;
}
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