LXR iproute2/lib/ll

   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 <stdio.h>
  13#include <stdlib.h>
  14#include <unistd.h>
  15#include <fcntl.h>
  16#include <sys/ioctl.h>
  17#include <sys/socket.h>
  18#include <netinet/in.h>
  19#include <arpa/inet.h>
  20#include <string.h>
  21
  22#include <linux/netdevice.h>
  23#include <linux/if_arp.h>
  24#include <linux/sockios.h>
  25
  26#include "rt_names.h"
  27#include "utils.h"
  28
  29const char *ll_addr_n2a(const unsigned char *addr, int alen, int type,
  30                        char *buf, int blen)
  31{
  32        int i;
  33        int l;
  34
  35        if (alen == 4 &&
  36            (type == ARPHRD_TUNNEL || type == ARPHRD_SIT
  37             || type == ARPHRD_IPGRE))
  38                return inet_ntop(AF_INET, addr, buf, blen);
  39
  40        if (alen == 16 && (type == ARPHRD_TUNNEL6 || type == ARPHRD_IP6GRE))
  41                return inet_ntop(AF_INET6, addr, buf, blen);
  42
  43        snprintf(buf, blen, "%02x", addr[0]);
  44        for (i = 1, l = 2; i < alen && l < blen; i++, l += 3)
  45                snprintf(buf + l, blen - l, ":%02x", addr[i]);
  46        return buf;
  47}
  48
  49/*NB: lladdr is char * (rather than u8 *) because sa_data is char * (1003.1g) */
  50int ll_addr_a2n(char *lladdr, int len, const char *arg)
  51{
  52        if (strchr(arg, '.')) {
  53                inet_prefix pfx;
  54                if (get_addr_1(&pfx, arg, AF_INET)) {
  55                        fprintf(stderr, "\"%s\" is invalid lladdr.\n", arg);
  56                        return -1;
  57                }
  58                if (len < 4)
  59                        return -1;
  60                memcpy(lladdr, pfx.data, 4);
  61                return 4;
  62        } else {
  63                int i;
  64
  65                for (i = 0; i < len; i++) {
  66                        int temp;
  67                        char *cp = strchr(arg, ':');
  68                        if (cp) {
  69                                *cp = 0;
  70                                cp++;
  71                        }
  72                        if (sscanf(arg, "%x", &temp) != 1) {
  73                                fprintf(stderr, "\"%s\" is invalid lladdr.\n",
  74                                        arg);
  75                                return -1;
  76                        }
  77                        if (temp < 0 || temp > 255) {
  78                                fprintf(stderr, "\"%s\" is invalid lladdr.\n",
  79                                        arg);
  80                                return -1;
  81                        }
  82                        lladdr[i] = temp;
  83                        if (!cp)
  84                                break;
  85                        arg = cp;
  86                }
  87                return i + 1;
  88        }
  89}
  90