1 | /*
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2 | * nameif.c - Naming Interfaces based on MAC address for busybox.
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3 | *
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4 | * Written 2000 by Andi Kleen.
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5 | * Busybox port 2002 by Nick Fedchik <nick@fedchik.org.ua>
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6 | * Glenn McGrath <bug1@iinet.net.au>
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7 | *
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8 | * Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
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9 | */
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10 |
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11 | #include "busybox.h"
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12 |
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13 | #include <sys/syslog.h>
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14 | #include <sys/socket.h>
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15 | #include <sys/ioctl.h>
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16 | #include <errno.h>
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17 | #include <string.h>
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18 | #include <unistd.h>
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19 | #include <net/if.h>
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20 | #include <netinet/ether.h>
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21 |
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22 |
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23 | /* Older versions of net/if.h do not appear to define IF_NAMESIZE. */
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24 | #ifndef IF_NAMESIZE
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25 | # ifdef IFNAMSIZ
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26 | # define IF_NAMESIZE IFNAMSIZ
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27 | # else
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28 | # define IF_NAMESIZE 16
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29 | # endif
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30 | #endif
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31 |
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32 | /* take from linux/sockios.h */
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33 | #define SIOCSIFNAME 0x8923 /* set interface name */
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34 |
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35 | /* Octets in one Ethernet addr, from <linux/if_ether.h> */
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36 | #define ETH_ALEN 6
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37 |
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38 | #ifndef ifr_newname
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39 | #define ifr_newname ifr_ifru.ifru_slave
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40 | #endif
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41 |
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42 | typedef struct mactable_s {
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43 | struct mactable_s *next;
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44 | struct mactable_s *prev;
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45 | char *ifname;
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46 | struct ether_addr *mac;
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47 | } mactable_t;
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48 |
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49 | static unsigned long flags;
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50 |
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51 | static void serror(const char *s, ...) ATTRIBUTE_NORETURN;
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52 |
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53 | static void serror(const char *s, ...)
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54 | {
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55 | va_list ap;
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56 |
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57 | va_start(ap, s);
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58 |
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59 | if (flags & 1) {
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60 | openlog(bb_applet_name, 0, LOG_LOCAL0);
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61 | vsyslog(LOG_ERR, s, ap);
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62 | closelog();
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63 | } else {
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64 | bb_verror_msg(s, ap);
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65 | putc('\n', stderr);
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66 | }
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67 | va_end(ap);
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68 |
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69 | exit(EXIT_FAILURE);
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70 | }
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71 |
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72 | /* Check ascii str_macaddr, convert and copy to *mac */
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73 | static struct ether_addr *cc_macaddr(const char *str_macaddr)
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74 | {
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75 | struct ether_addr *lmac, *mac;
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76 |
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77 | lmac = ether_aton(str_macaddr);
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78 | if (lmac == NULL)
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79 | serror("cannot parse MAC %s", str_macaddr);
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80 | mac = xmalloc(ETH_ALEN);
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81 | memcpy(mac, lmac, ETH_ALEN);
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82 |
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83 | return mac;
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84 | }
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85 |
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86 | int nameif_main(int argc, char **argv)
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87 | {
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88 | mactable_t *clist = NULL;
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89 | FILE *ifh;
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90 | const char *fname = "/etc/mactab";
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91 | char *line;
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92 | int ctl_sk;
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93 | int if_index = 1;
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94 | mactable_t *ch;
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95 |
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96 | flags = bb_getopt_ulflags(argc, argv, "sc:", &fname);
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97 |
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98 | if ((argc - optind) & 1)
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99 | bb_show_usage();
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100 |
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101 | if (optind < argc) {
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102 | char **a = argv + optind;
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103 |
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104 | while (*a) {
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105 |
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106 | if (strlen(*a) > IF_NAMESIZE)
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107 | serror("interface name `%s' too long", *a);
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108 | ch = xzalloc(sizeof(mactable_t));
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109 | ch->ifname = bb_xstrdup(*a++);
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110 | ch->mac = cc_macaddr(*a++);
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111 | if (clist)
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112 | clist->prev = ch;
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113 | ch->next = clist;
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114 | clist = ch;
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115 | }
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116 | } else {
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117 | ifh = bb_xfopen(fname, "r");
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118 |
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119 | while ((line = bb_get_line_from_file(ifh)) != NULL) {
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120 | char *line_ptr;
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121 | size_t name_length;
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122 |
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123 | line_ptr = line + strspn(line, " \t");
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124 | if ((line_ptr[0] == '#') || (line_ptr[0] == '\n')) {
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125 | free(line);
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126 | continue;
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127 | }
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128 | name_length = strcspn(line_ptr, " \t");
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129 | ch = xzalloc(sizeof(mactable_t));
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130 | ch->ifname = bb_xstrndup(line_ptr, name_length);
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131 | if (name_length > IF_NAMESIZE)
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132 | serror("interface name `%s' too long", ch->ifname);
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133 | line_ptr += name_length;
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134 | line_ptr += strspn(line_ptr, " \t");
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135 | name_length = strspn(line_ptr, "0123456789ABCDEFabcdef:");
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136 | line_ptr[name_length] = '\0';
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137 | ch->mac = cc_macaddr(line_ptr);
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138 | if (clist)
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139 | clist->prev = ch;
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140 | ch->next = clist;
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141 | clist = ch;
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142 | free(line);
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143 | }
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144 | fclose(ifh);
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145 | }
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146 |
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147 | if ((ctl_sk = socket(PF_INET, SOCK_DGRAM, 0)) == -1)
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148 | serror("socket: %m");
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149 |
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150 | while (clist) {
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151 | struct ifreq ifr;
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152 |
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153 | memset(&ifr, 0, sizeof(struct ifreq));
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154 | if_index++;
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155 | ifr.ifr_ifindex = if_index;
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156 |
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157 | /* Get ifname by index or die */
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158 | if (ioctl(ctl_sk, SIOCGIFNAME, &ifr))
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159 | break;
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160 |
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161 | /* Has this device hwaddr? */
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162 | if (ioctl(ctl_sk, SIOCGIFHWADDR, &ifr))
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163 | continue;
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164 |
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165 | /* Search for mac like in ifr.ifr_hwaddr.sa_data */
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166 | for (ch = clist; ch; ch = ch->next)
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167 | if (!memcmp(ch->mac, ifr.ifr_hwaddr.sa_data, ETH_ALEN))
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168 | break;
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169 |
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170 | /* Nothing found for current ifr.ifr_hwaddr.sa_data */
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171 | if (ch == NULL)
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172 | continue;
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173 |
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174 | strcpy(ifr.ifr_newname, ch->ifname);
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175 | if (ioctl(ctl_sk, SIOCSIFNAME, &ifr) < 0)
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176 | serror("cannot change ifname %s to %s: %m",
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177 | ifr.ifr_name, ch->ifname);
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178 |
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179 | /* Remove list entry of renamed interface */
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180 | if (ch->prev != NULL) {
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181 | (ch->prev)->next = ch->next;
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182 | } else {
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183 | clist = ch->next;
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184 | }
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185 | if (ch->next != NULL)
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186 | (ch->next)->prev = ch->prev;
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187 | if (ENABLE_FEATURE_CLEAN_UP) {
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188 | free(ch->ifname);
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189 | free(ch->mac);
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190 | free(ch);
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191 | }
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192 | }
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193 |
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194 | return 0;
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195 | }
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