lib/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 <stdio.h>
  13 #include <stdlib.h>
  14 #include <unistd.h>
  15 #include <syslog.h>
  16 #include <fcntl.h>
  17 #include <sys/ioctl.h>
  18 #include <sys/socket.h>
  19 #include <sys/ioctl.h>
  20 #include <linux/netdevice.h>
  21 #include <linux/if_arp.h>
  22 #include <linux/sockios.h>
  23 #include <netinet/in.h>
  24 #include <arpa/inet.h>
  25 #include <string.h>
  26
  27 #include "utils.h"
  28
  29
  30 const char *ll_addr_n2a(unsigned char *addr, int alen, int type, char *buf, int blen)
  31 {
  32         int i;
  33         int l;
  34
  35         if (alen == 4 &&
  36             (type == ARPHRD_TUNNEL || type == ARPHRD_SIT || type == ARPHRD_IPGRE)) {
  37                 return inet_ntop(AF_INET, addr, buf, blen);
  38         }
  39         l = 0;
  40         for (i=0; i<alen; i++) {
  41                 if (i==0) {
  42                         snprintf(buf+l, blen, "%02x", addr[i]);
  43                         blen -= 2;
  44                         l += 2;
  45                 } else {
  46                         snprintf(buf+l, blen, ":%02x", addr[i]);
  47                         blen -= 3;
  48                         l += 3;
  49                 }
  50         }
  51         return buf;
  52 }
  53
  54 int ll_addr_a2n(unsigned char *lladdr, int len, char *arg)
  55 {
  56         if (strchr(arg, '.')) {
  57                 inet_prefix pfx;
  58                 if (get_addr_1(&pfx, arg, AF_INET)) {
  59                         fprintf(stderr, "\"%s\" is invalid lladdr.\n", arg);
  60                         return -1;
  61                 }
  62                 if (len < 4)
  63                         return -1;
  64                 memcpy(lladdr, pfx.data, 4);
  65                 return 4;
  66         } else {
  67                 int i;
  68
  69                 for (i=0; i<len; i++) {
  70                         int temp;
  71                         char *cp = strchr(arg, ':');
  72                         if (cp) {
  73                                 *cp = 0;
  74                                 cp++;
  75                         }
  76                         if (sscanf(arg, "%x", &temp) != 1) {
  77                                 fprintf(stderr, "\"%s\" is invalid lladdr.\n", arg);
  78                                 return -1;
  79                         }
  80                         if (temp < 0 || temp > 255) {
  81                                 fprintf(stderr, "\"%s\" is invalid lladdr.\n", arg);
  82                                 return -1;
  83                         }
  84                         lladdr[i] = temp;
  85                         if (!cp)
  86                                 break;
  87                         arg = cp;
  88                 }
  89                 return i+1;
  90         }
  91 }