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 <netinet/in.h>
21#include <arpa/inet.h>
22#include <string.h>
23
24#include <linux/netdevice.h>
25#include <linux/if_arp.h>
26#include <linux/sockios.h>
27
28#include "rt_names.h"
29#include "utils.h"
30
31
32const char *ll_addr_n2a(unsigned char *addr, int alen, int type, char *buf, int blen)
33{
34	int i;
35	int l;
36
37	if (alen == 4 &&
38	    (type == ARPHRD_TUNNEL || type == ARPHRD_SIT || type == ARPHRD_IPGRE)) {
39		return inet_ntop(AF_INET, addr, buf, blen);
40	}
41	l = 0;
42	for (i=0; i<alen; i++) {
43		if (i==0) {
44			snprintf(buf+l, blen, "%02x", addr[i]);
45			blen -= 2;
46			l += 2;
47		} else {
48			snprintf(buf+l, blen, ":%02x", addr[i]);
49			blen -= 3;
50			l += 3;
51		}
52	}
53	return buf;
54}
55
56/*NB: lladdr is char * (rather than u8 *) because sa_data is char * (1003.1g) */
57int ll_addr_a2n(char *lladdr, int len, char *arg)
58{
59	if (strchr(arg, '.')) {
60		inet_prefix pfx;
61		if (get_addr_1(&pfx, arg, AF_INET)) {
62			fprintf(stderr, "\"%s\" is invalid lladdr.\n", arg);
63			return -1;
64		}
65		if (len < 4)
66			return -1;
67		memcpy(lladdr, pfx.data, 4);
68		return 4;
69	} else {
70		int i;
71
72		for (i=0; i<len; i++) {
73			int temp;
74			char *cp = strchr(arg, ':');
75			if (cp) {
76				*cp = 0;
77				cp++;
78			}
79			if (sscanf(arg, "%x", &temp) != 1) {
80				fprintf(stderr, "\"%s\" is invalid lladdr.\n", arg);
81				return -1;
82			}
83			if (temp < 0 || temp > 255) {
84				fprintf(stderr, "\"%s\" is invalid lladdr.\n", arg);
85				return -1;
86			}
87			lladdr[i] = temp;
88			if (!cp)
89				break;
90			arg = cp;
91		}
92		return i+1;
93	}
94}
95