[1770] | 1 | /* vi: set sw=4 ts=4: */
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[821] | 2 | /*
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| 3 | * nameif.c - Naming Interfaces based on MAC address for busybox.
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| 4 | *
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| 5 | * Written 2000 by Andi Kleen.
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| 6 | * Busybox port 2002 by Nick Fedchik <nick@fedchik.org.ua>
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| 7 | * Glenn McGrath <bug1@iinet.net.au>
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| 8 | *
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| 9 | * Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
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| 10 | */
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| 11 |
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[1770] | 12 | #include "libbb.h"
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| 13 | #include <syslog.h>
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[821] | 14 | #include <net/if.h>
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| 15 | #include <netinet/ether.h>
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| 16 |
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| 17 |
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| 18 | /* Older versions of net/if.h do not appear to define IF_NAMESIZE. */
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| 19 | #ifndef IF_NAMESIZE
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| 20 | # ifdef IFNAMSIZ
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| 21 | # define IF_NAMESIZE IFNAMSIZ
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| 22 | # else
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| 23 | # define IF_NAMESIZE 16
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| 24 | # endif
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| 25 | #endif
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| 26 |
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| 27 | /* take from linux/sockios.h */
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| 28 | #define SIOCSIFNAME 0x8923 /* set interface name */
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| 29 |
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| 30 | /* Octets in one Ethernet addr, from <linux/if_ether.h> */
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| 31 | #define ETH_ALEN 6
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| 32 |
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| 33 | #ifndef ifr_newname
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| 34 | #define ifr_newname ifr_ifru.ifru_slave
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| 35 | #endif
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| 36 |
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| 37 | typedef struct mactable_s {
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| 38 | struct mactable_s *next;
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| 39 | struct mactable_s *prev;
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| 40 | char *ifname;
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| 41 | struct ether_addr *mac;
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| 42 | } mactable_t;
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| 43 |
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| 44 | /* Check ascii str_macaddr, convert and copy to *mac */
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| 45 | static struct ether_addr *cc_macaddr(const char *str_macaddr)
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| 46 | {
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| 47 | struct ether_addr *lmac, *mac;
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| 48 |
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| 49 | lmac = ether_aton(str_macaddr);
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| 50 | if (lmac == NULL)
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[1770] | 51 | bb_error_msg_and_die("cannot parse MAC %s", str_macaddr);
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[821] | 52 | mac = xmalloc(ETH_ALEN);
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| 53 | memcpy(mac, lmac, ETH_ALEN);
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| 54 |
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| 55 | return mac;
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| 56 | }
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| 57 |
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[1770] | 58 | int nameif_main(int argc, char **argv);
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[821] | 59 | int nameif_main(int argc, char **argv)
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| 60 | {
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| 61 | mactable_t *clist = NULL;
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| 62 | FILE *ifh;
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| 63 | const char *fname = "/etc/mactab";
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| 64 | char *line;
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| 65 | int ctl_sk;
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| 66 | int if_index = 1;
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| 67 | mactable_t *ch;
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| 68 |
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[1770] | 69 | if (1 & getopt32(argv, "sc:", &fname)) {
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| 70 | openlog(applet_name, 0, LOG_LOCAL0);
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| 71 | logmode = LOGMODE_SYSLOG;
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| 72 | }
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[821] | 73 |
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| 74 | if ((argc - optind) & 1)
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| 75 | bb_show_usage();
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| 76 |
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| 77 | if (optind < argc) {
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| 78 | char **a = argv + optind;
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| 79 |
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| 80 | while (*a) {
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| 81 | if (strlen(*a) > IF_NAMESIZE)
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[1770] | 82 | bb_error_msg_and_die("interface name '%s' "
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| 83 | "too long", *a);
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[821] | 84 | ch = xzalloc(sizeof(mactable_t));
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[1770] | 85 | ch->ifname = xstrdup(*a++);
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[821] | 86 | ch->mac = cc_macaddr(*a++);
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| 87 | if (clist)
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| 88 | clist->prev = ch;
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| 89 | ch->next = clist;
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| 90 | clist = ch;
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| 91 | }
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| 92 | } else {
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[1770] | 93 | ifh = xfopen(fname, "r");
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[821] | 94 |
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[1770] | 95 | while ((line = xmalloc_fgets(ifh)) != NULL) {
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[821] | 96 | char *line_ptr;
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| 97 | size_t name_length;
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| 98 |
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| 99 | line_ptr = line + strspn(line, " \t");
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| 100 | if ((line_ptr[0] == '#') || (line_ptr[0] == '\n')) {
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| 101 | free(line);
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| 102 | continue;
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| 103 | }
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| 104 | name_length = strcspn(line_ptr, " \t");
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| 105 | ch = xzalloc(sizeof(mactable_t));
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[1770] | 106 | ch->ifname = xstrndup(line_ptr, name_length);
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[821] | 107 | if (name_length > IF_NAMESIZE)
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[1770] | 108 | bb_error_msg_and_die("interface name '%s' "
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| 109 | "too long", ch->ifname);
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[821] | 110 | line_ptr += name_length;
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| 111 | line_ptr += strspn(line_ptr, " \t");
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| 112 | name_length = strspn(line_ptr, "0123456789ABCDEFabcdef:");
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| 113 | line_ptr[name_length] = '\0';
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| 114 | ch->mac = cc_macaddr(line_ptr);
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| 115 | if (clist)
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| 116 | clist->prev = ch;
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| 117 | ch->next = clist;
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| 118 | clist = ch;
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| 119 | free(line);
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| 120 | }
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| 121 | fclose(ifh);
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| 122 | }
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| 123 |
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[1770] | 124 | ctl_sk = xsocket(PF_INET, SOCK_DGRAM, 0);
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[821] | 125 |
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| 126 | while (clist) {
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| 127 | struct ifreq ifr;
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| 128 |
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| 129 | memset(&ifr, 0, sizeof(struct ifreq));
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| 130 | if_index++;
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| 131 | ifr.ifr_ifindex = if_index;
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| 132 |
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| 133 | /* Get ifname by index or die */
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| 134 | if (ioctl(ctl_sk, SIOCGIFNAME, &ifr))
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| 135 | break;
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| 136 |
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| 137 | /* Has this device hwaddr? */
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| 138 | if (ioctl(ctl_sk, SIOCGIFHWADDR, &ifr))
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| 139 | continue;
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| 140 |
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| 141 | /* Search for mac like in ifr.ifr_hwaddr.sa_data */
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| 142 | for (ch = clist; ch; ch = ch->next)
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| 143 | if (!memcmp(ch->mac, ifr.ifr_hwaddr.sa_data, ETH_ALEN))
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| 144 | break;
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| 145 |
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| 146 | /* Nothing found for current ifr.ifr_hwaddr.sa_data */
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| 147 | if (ch == NULL)
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| 148 | continue;
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| 149 |
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| 150 | strcpy(ifr.ifr_newname, ch->ifname);
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[1770] | 151 | ioctl_or_perror_and_die(ctl_sk, SIOCSIFNAME, &ifr,
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| 152 | "cannot change ifname %s to %s",
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| 153 | ifr.ifr_name, ch->ifname);
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[821] | 154 |
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| 155 | /* Remove list entry of renamed interface */
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| 156 | if (ch->prev != NULL) {
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| 157 | (ch->prev)->next = ch->next;
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| 158 | } else {
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| 159 | clist = ch->next;
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| 160 | }
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| 161 | if (ch->next != NULL)
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| 162 | (ch->next)->prev = ch->prev;
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| 163 | if (ENABLE_FEATURE_CLEAN_UP) {
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| 164 | free(ch->ifname);
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| 165 | free(ch->mac);
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| 166 | free(ch);
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| 167 | }
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| 168 | }
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| 169 |
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| 170 | return 0;
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| 171 | }
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