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