diff options
Diffstat (limited to 'busybox/networking/nameif.c')
| -rw-r--r-- | busybox/networking/nameif.c | 222 |
1 files changed, 222 insertions, 0 deletions
diff --git a/busybox/networking/nameif.c b/busybox/networking/nameif.c new file mode 100644 index 0000000..10f13b4 --- /dev/null +++ b/busybox/networking/nameif.c @@ -0,0 +1,222 @@ +/* + * 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> + * + * 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" + +/* 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 char use_syslog; + +static void serror(const char *s, ...) __attribute__ ((noreturn)); + +static void serror(const char *s, ...) +{ + va_list ap; + + va_start(ap, s); + + if (use_syslog) { + 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 */ +struct ether_addr *cc_macaddr(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 opt; + int if_index = 1; + mactable_t *ch; + + + while ((opt = getopt(argc, argv, "c:s")) != -1) { + switch (opt) { + case 'c': + fname = optarg; + break; + case 's': + use_syslog = 1; + break; + default: + bb_show_usage(); + } + } + + 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 = xcalloc(1, sizeof(mactable_t)); + ch->ifname = bb_xstrdup(*a++); + ch->mac = cc_macaddr(*a++); + if (clist) + clist->prev = ch; + ch->next = clist; + clist = ch; + } + } else { + ifh = bb_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')) + continue; + name_length = strcspn(line_ptr, " \t"); + ch = xcalloc(1, sizeof(mactable_t)); + ch->ifname = bb_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; + + bzero(&ifr, 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; +#ifdef CONFIG_FEATURE_CLEAN_UP + free(ch->ifname); + free(ch->mac); + free(ch); +#endif + } + + return 0; +} |