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    Contents of /trunk/mkinitrd-magellan/busybox/networking/nameif.c

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    Revision 532 - (show annotations) (download)
    Sat Sep 1 22:45:15 2007 UTC (16 years, 8 months ago) by niro
    File MIME type: text/plain
    File size: 3877 byte(s) 
    -import if magellan mkinitrd; it is a fork of redhats mkinitrd-5.0.8 with all magellan patches and features; deprecates magellan-src/mkinitrd
    1 /* vi: set sw=4 ts=4: */
    2 /*
    3 * nameif.c - Naming Interfaces based on MAC address for busybox.
    4 *
    5 * Written 2000 by Andi Kleen.
    6 * Busybox port 2002 by Nick Fedchik <nick@fedchik.org.ua>
    7 * Glenn McGrath <bug1@iinet.net.au>
    8 *
    9 * Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
    10 */
    11
    12 #include "busybox.h"
    13 #include <syslog.h>
    14 #include <net/if.h>
    15 #include <netinet/ether.h>
    16
    17
    18 /* Older versions of net/if.h do not appear to define IF_NAMESIZE. */
    19 #ifndef IF_NAMESIZE
    20 # ifdef IFNAMSIZ
    21 # define IF_NAMESIZE IFNAMSIZ
    22 # else
    23 # define IF_NAMESIZE 16
    24 # endif
    25 #endif
    26
    27 /* take from linux/sockios.h */
    28 #define SIOCSIFNAME 0x8923 /* set interface name */
    29
    30 /* Octets in one Ethernet addr, from <linux/if_ether.h> */
    31 #define ETH_ALEN 6
    32
    33 #ifndef ifr_newname
    34 #define ifr_newname ifr_ifru.ifru_slave
    35 #endif
    36
    37 typedef struct mactable_s {
    38 struct mactable_s *next;
    39 struct mactable_s *prev;
    40 char *ifname;
    41 struct ether_addr *mac;
    42 } mactable_t;
    43
    44 /* Check ascii str_macaddr, convert and copy to *mac */
    45 static struct ether_addr *cc_macaddr(const char *str_macaddr)
    46 {
    47 struct ether_addr *lmac, *mac;
    48
    49 lmac = ether_aton(str_macaddr);
    50 if (lmac == NULL)
    51 bb_error_msg_and_die("cannot parse MAC %s", str_macaddr);
    52 mac = xmalloc(ETH_ALEN);
    53 memcpy(mac, lmac, ETH_ALEN);
    54
    55 return mac;
    56 }
    57
    58 int nameif_main(int argc, char **argv)
    59 {
    60 mactable_t *clist = NULL;
    61 FILE *ifh;
    62 const char *fname = "/etc/mactab";
    63 char *line;
    64 int ctl_sk;
    65 int if_index = 1;
    66 mactable_t *ch;
    67
    68 if (1 & getopt32(argc, argv, "sc:", &fname)) {
    69 openlog(applet_name, 0, LOG_LOCAL0);
    70 logmode = LOGMODE_SYSLOG;
    71 }
    72
    73 if ((argc - optind) & 1)
    74 bb_show_usage();
    75
    76 if (optind < argc) {
    77 char **a = argv + optind;
    78
    79 while (*a) {
    80 if (strlen(*a) > IF_NAMESIZE)
    81 bb_error_msg_and_die("interface name '%s' "
    82 "too long", *a);
    83 ch = xzalloc(sizeof(mactable_t));
    84 ch->ifname = xstrdup(*a++);
    85 ch->mac = cc_macaddr(*a++);
    86 if (clist)
    87 clist->prev = ch;
    88 ch->next = clist;
    89 clist = ch;
    90 }
    91 } else {
    92 ifh = xfopen(fname, "r");
    93
    94 while ((line = xmalloc_fgets(ifh)) != NULL) {
    95 char *line_ptr;
    96 size_t name_length;
    97
    98 line_ptr = line + strspn(line, " \t");
    99 if ((line_ptr[0] == '#') || (line_ptr[0] == '\n')) {
    100 free(line);
    101 continue;
    102 }
    103 name_length = strcspn(line_ptr, " \t");
    104 ch = xzalloc(sizeof(mactable_t));
    105 ch->ifname = xstrndup(line_ptr, name_length);
    106 if (name_length > IF_NAMESIZE)
    107 bb_error_msg_and_die("interface name '%s' "
    108 "too long", ch->ifname);
    109 line_ptr += name_length;
    110 line_ptr += strspn(line_ptr, " \t");
    111 name_length = strspn(line_ptr, "0123456789ABCDEFabcdef:");
    112 line_ptr[name_length] = '\0';
    113 ch->mac = cc_macaddr(line_ptr);
    114 if (clist)
    115 clist->prev = ch;
    116 ch->next = clist;
    117 clist = ch;
    118 free(line);
    119 }
    120 fclose(ifh);
    121 }
    122
    123 ctl_sk = xsocket(PF_INET, SOCK_DGRAM, 0);
    124
    125 while (clist) {
    126 struct ifreq ifr;
    127
    128 memset(&ifr, 0, sizeof(struct ifreq));
    129 if_index++;
    130 ifr.ifr_ifindex = if_index;
    131
    132 /* Get ifname by index or die */
    133 if (ioctl(ctl_sk, SIOCGIFNAME, &ifr))
    134 break;
    135
    136 /* Has this device hwaddr? */
    137 if (ioctl(ctl_sk, SIOCGIFHWADDR, &ifr))
    138 continue;
    139
    140 /* Search for mac like in ifr.ifr_hwaddr.sa_data */
    141 for (ch = clist; ch; ch = ch->next)
    142 if (!memcmp(ch->mac, ifr.ifr_hwaddr.sa_data, ETH_ALEN))
    143 break;
    144
    145 /* Nothing found for current ifr.ifr_hwaddr.sa_data */
    146 if (ch == NULL)
    147 continue;
    148
    149 strcpy(ifr.ifr_newname, ch->ifname);
    150 if (ioctl(ctl_sk, SIOCSIFNAME, &ifr) < 0)
    151 bb_perror_msg_and_die("cannot change ifname %s to %s",
    152 ifr.ifr_name, ch->ifname);
    153
    154 /* Remove list entry of renamed interface */
    155 if (ch->prev != NULL) {
    156 (ch->prev)->next = ch->next;
    157 } else {
    158 clist = ch->next;
    159 }
    160 if (ch->next != NULL)
    161 (ch->next)->prev = ch->prev;
    162 if (ENABLE_FEATURE_CLEAN_UP) {
    163 free(ch->ifname);
    164 free(ch->mac);
    165 free(ch);
    166 }
    167 }
    168
    169 return 0;
    170 }