hush/networking/nameif.c
Rob Landley d921b2ecc0 Remove bb_ prefixes from xfuncs.c (and a few other places), consolidate
things like xasprintf() into xfuncs.c, remove xprint_file_by_name() (it only
had one user), clean up lots of #includes...  General cleanup pass.  What I've
been doing for the last couple days.

And it conflicts!  I've removed httpd.c from this checkin due to somebody else
touching that file.  It builds for me.  I have to catch a bus.  (Now you know
why I'm looking forward to Mercurial.)
2006-08-03 15:41:12 +00:00

191 lines
4.0 KiB
C

/* vi: set sw=4 ts=4: */
/*
* nameif.c - Naming Interfaces based on MAC address for busybox.
*
* Written 2000 by Andi Kleen.
* Busybox port 2002 by Nick Fedchik <nick@fedchik.org.ua>
* Glenn McGrath <bug1@iinet.net.au>
*
* Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
*/
#include "busybox.h"
#include <syslog.h>
#include <net/if.h>
#include <netinet/ether.h>
/* Older versions of net/if.h do not appear to define IF_NAMESIZE. */
#ifndef IF_NAMESIZE
# ifdef IFNAMSIZ
# define IF_NAMESIZE IFNAMSIZ
# else
# define IF_NAMESIZE 16
# endif
#endif
/* 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 unsigned long flags;
static void serror(const char *s, ...) ATTRIBUTE_NORETURN;
static void serror(const char *s, ...)
{
va_list ap;
va_start(ap, s);
if (flags & 1) {
openlog(bb_applet_name, 0, LOG_LOCAL0);
vsyslog(LOG_ERR, s, ap);
closelog();
} else {
bb_verror_msg(s, ap);
putc('\n', stderr);
}
va_end(ap);
exit(EXIT_FAILURE);
}
/* Check ascii str_macaddr, convert and copy to *mac */
static struct ether_addr *cc_macaddr(const char *str_macaddr)
{
struct ether_addr *lmac, *mac;
lmac = ether_aton(str_macaddr);
if (lmac == NULL)
serror("cannot parse MAC %s", str_macaddr);
mac = xmalloc(ETH_ALEN);
memcpy(mac, lmac, ETH_ALEN);
return mac;
}
int nameif_main(int argc, char **argv)
{
mactable_t *clist = NULL;
FILE *ifh;
const char *fname = "/etc/mactab";
char *line;
int ctl_sk;
int if_index = 1;
mactable_t *ch;
flags = bb_getopt_ulflags(argc, argv, "sc:", &fname);
if ((argc - optind) & 1)
bb_show_usage();
if (optind < argc) {
char **a = argv + optind;
while (*a) {
if (strlen(*a) > IF_NAMESIZE)
serror("interface name `%s' too long", *a);
ch = xzalloc(sizeof(mactable_t));
ch->ifname = xstrdup(*a++);
ch->mac = cc_macaddr(*a++);
if (clist)
clist->prev = ch;
ch->next = clist;
clist = ch;
}
} else {
ifh = xfopen(fname, "r");
while ((line = bb_get_line_from_file(ifh)) != NULL) {
char *line_ptr;
size_t name_length;
line_ptr = line + strspn(line, " \t");
if ((line_ptr[0] == '#') || (line_ptr[0] == '\n')) {
free(line);
continue;
}
name_length = strcspn(line_ptr, " \t");
ch = xzalloc(sizeof(mactable_t));
ch->ifname = xstrndup(line_ptr, name_length);
if (name_length > IF_NAMESIZE)
serror("interface name `%s' too long", ch->ifname);
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);
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("socket: %m");
while (clist) {
struct ifreq ifr;
memset(&ifr, 0, 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("cannot change ifname %s to %s: %m",
ifr.ifr_name, ch->ifname);
/* 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;
if (ENABLE_FEATURE_CLEAN_UP) {
free(ch->ifname);
free(ch->mac);
free(ch);
}
}
return 0;
}