networking/libiproute/ll_addr.c

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