1 | /* vi: set sw=4 ts=4: */
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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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12 | #include "libbb.h"
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13 | #include <syslog.h>
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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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51 | bb_error_msg_and_die("cannot parse MAC %s", str_macaddr);
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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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58 | int nameif_main(int argc, char **argv);
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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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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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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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82 | bb_error_msg_and_die("interface name '%s' "
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83 | "too long", *a);
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84 | ch = xzalloc(sizeof(mactable_t));
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85 | ch->ifname = xstrdup(*a++);
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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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93 | ifh = xfopen(fname, "r");
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94 |
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95 | while ((line = xmalloc_fgets(ifh)) != NULL) {
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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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106 | ch->ifname = xstrndup(line_ptr, name_length);
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107 | if (name_length > IF_NAMESIZE)
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108 | bb_error_msg_and_die("interface name '%s' "
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109 | "too long", ch->ifname);
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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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124 | ctl_sk = xsocket(PF_INET, SOCK_DGRAM, 0);
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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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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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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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