git.maemo.org Git - busybox4maemo/blob - 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 <net/if_arp.h>
  14
  15 #include "libbb.h"
  16 #include "rt_names.h"
  17 #include "utils.h"
  18
  19
  20 const char *ll_addr_n2a(unsigned char *addr, int alen, int type, char *buf, int blen)
  21 {
  22         int i;
  23         int l;
  24
  25         if (alen == 4 &&
  26             (type == ARPHRD_TUNNEL || type == ARPHRD_SIT || type == ARPHRD_IPGRE)) {
  27                 return inet_ntop(AF_INET, addr, buf, blen);
  28         }
  29         l = 0;
  30         for (i=0; i<alen; i++) {
  31                 if (i==0) {
  32                         snprintf(buf+l, blen, ":%02x"+1, addr[i]);
  33                         blen -= 2;
  34                         l += 2;
  35                 } else {
  36                         snprintf(buf+l, blen, ":%02x", addr[i]);
  37                         blen -= 3;
  38                         l += 3;
  39                 }
  40         }
  41         return buf;
  42 }
  43
  44 int ll_addr_a2n(unsigned char *lladdr, int len, char *arg)
  45 {
  46         if (strchr(arg, '.')) {
  47                 inet_prefix pfx;
  48                 if (get_addr_1(&pfx, arg, AF_INET)) {
  49                         bb_error_msg("\"%s\" is invalid lladdr", arg);
  50                         return -1;
  51                 }
  52                 if (len < 4) {
  53                         return -1;
  54                 }
  55                 memcpy(lladdr, pfx.data, 4);
  56                 return 4;
  57         } else {
  58                 int i;
  59
  60                 for (i=0; i<len; i++) {
  61                         int temp;
  62                         char *cp = strchr(arg, ':');
  63                         if (cp) {
  64                                 *cp = 0;
  65                                 cp++;
  66                         }
  67                         if (sscanf(arg, "%x", &temp) != 1) {
  68                                 bb_error_msg("\"%s\" is invalid lladdr", arg);
  69                                 return -1;
  70                         }
  71                         if (temp < 0 || temp > 255) {
  72                                 bb_error_msg("\"%s\" is invalid lladdr", arg);
  73                                 return -1;
  74                         }
  75                         lladdr[i] = temp;
  76                         if (!cp) {
  77                                 break;
  78                         }
  79                         arg = cp;
  80                 }
  81                 return i+1;
  82         }
  83 }