networking/libiproute/ll_addr.c

   1 /* vi: set sw=4 ts=4: */
   2 /*
   3  * ll_addr.c
   4  *
   5  *              This program is free software; you can redistribute it and/or
   6  *              modify it under the terms of the GNU General Public License
   7  *              as published by the Free Software Foundation; either version
   8  *              2 of the License, or (at your option) any later version.
   9  *
  10  * Authors:     Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
  11  */
  12
  13 #include "libbb.h"
  14
  15 #include <string.h>
  16 #include <net/if_arp.h>
  17
  18 #include "rt_names.h"
  19 #include "utils.h"
  20
  21
  22 const char *ll_addr_n2a(unsigned char *addr, int alen, int type, char *buf, int blen)
  23 {
  24         int i;
  25         int l;
  26
  27         if (alen == 4 &&
  28             (type == ARPHRD_TUNNEL || type == ARPHRD_SIT || type == ARPHRD_IPGRE)) {
  29                 return inet_ntop(AF_INET, addr, buf, blen);
  30         }
  31         l = 0;
  32         for (i=0; i<alen; i++) {
  33                 if (i==0) {
  34                         snprintf(buf+l, blen, "%02x", addr[i]);
  35                         blen -= 2;
  36                         l += 2;
  37                 } else {
  38                         snprintf(buf+l, blen, ":%02x", addr[i]);
  39                         blen -= 3;
  40                         l += 3;
  41                 }
  42         }
  43         return buf;
  44 }
  45
  46 int ll_addr_a2n(unsigned char *lladdr, int len, char *arg)
  47 {
  48         if (strchr(arg, '.')) {
  49                 inet_prefix pfx;
  50                 if (get_addr_1(&pfx, arg, AF_INET)) {
  51                         bb_error_msg("\"%s\" is invalid lladdr.", arg);
  52                         return -1;
  53                 }
  54                 if (len < 4) {
  55                         return -1;
  56                 }
  57                 memcpy(lladdr, pfx.data, 4);
  58                 return 4;
  59         } else {
  60                 int i;
  61
  62                 for (i=0; i<len; i++) {
  63                         int temp;
  64                         char *cp = strchr(arg, ':');
  65                         if (cp) {
  66                                 *cp = 0;
  67                                 cp++;
  68                         }
  69                         if (sscanf(arg, "%x", &temp) != 1) {
  70                                 bb_error_msg("\"%s\" is invalid lladdr.", arg);
  71                                 return -1;
  72                         }
  73                         if (temp < 0 || temp > 255) {
  74                                 bb_error_msg("\"%s\" is invalid lladdr.", arg);
  75                                 return -1;
  76                         }
  77                         lladdr[i] = temp;
  78                         if (!cp) {
  79                                 break;
  80                         }
  81                         arg = cp;
  82                 }
  83                 return i+1;
  84         }
  85 }