LXR busybox/networking/libiproute/ll

   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
  20const char* FAST_FUNC 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        ) {
  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"+1, 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
  45int FAST_FUNC ll_addr_a2n(unsigned char *lladdr, int len, char *arg)
  46{
  47        int i;
  48
  49        if (strchr(arg, '.')) {
  50                inet_prefix pfx;
  51                if (get_addr_1(&pfx, arg, AF_INET)) {
  52                        bb_error_msg("\"%s\" is invalid lladdr", arg);
  53                        return -1;
  54                }
  55                if (len < 4) {
  56                        return -1;
  57                }
  58                memcpy(lladdr, pfx.data, 4);
  59                return 4;
  60        }
  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 || (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