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