diff options
Diffstat (limited to 'networking/nameif.c')
| -rw-r--r-- | networking/nameif.c | 217 |
1 files changed, 217 insertions, 0 deletions
diff --git a/networking/nameif.c b/networking/nameif.c new file mode 100644 index 0000000..1edd641 --- /dev/null +++ b/networking/nameif.c @@ -0,0 +1,217 @@ +/* + * 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; +} |