1/*	$NetBSD: linkaddr.c,v 1.13 2003/08/07 16:43:11 agc Exp $	*/
2
3/*-
4 * Copyright (c) 1990, 1993
5 *	The Regents of the University of California.  All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 *    may be used to endorse or promote products derived from this software
17 *    without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32#include <sys/cdefs.h>
33#if defined(LIBC_SCCS) && !defined(lint)
34#if 0
35static char sccsid[] = "@(#)linkaddr.c	8.1 (Berkeley) 6/4/93";
36#else
37__RCSID("$NetBSD: linkaddr.c,v 1.13 2003/08/07 16:43:11 agc Exp $");
38#endif
39#endif /* LIBC_SCCS and not lint */
40
41#include <sys/types.h>
42#include <sys/socket.h>
43#include <net/if_dl.h>
44
45#include <assert.h>
46#include <string.h>
47
48/* States*/
49#define NAMING	0
50#define GOTONE	1
51#define GOTTWO	2
52#define RESET	3
53/* Inputs */
54#define	DIGIT	(4*0)
55#define	END	(4*1)
56#define DELIM	(4*2)
57#define LETTER	(4*3)
58
59void
60link_addr(addr, sdl)
61	register const char *addr;
62	register struct sockaddr_dl *sdl;
63{
64	register char *cp = sdl->sdl_data;
65	char *cplim = sdl->sdl_len + (char *)(void *)sdl;
66	register int byte = 0, state = NAMING;
67	register int newaddr = 0;	/* pacify gcc */
68
69	_DIAGASSERT(addr != NULL);
70	_DIAGASSERT(sdl != NULL);
71
72	(void)memset(&sdl->sdl_family, 0, (size_t)sdl->sdl_len - 1);
73	sdl->sdl_family = AF_LINK;
74	do {
75		state &= ~LETTER;
76		if ((*addr >= '0') && (*addr <= '9')) {
77			newaddr = *addr - '0';
78		} else if ((*addr >= 'a') && (*addr <= 'f')) {
79			newaddr = *addr - 'a' + 10;
80		} else if ((*addr >= 'A') && (*addr <= 'F')) {
81			newaddr = *addr - 'A' + 10;
82		} else if (*addr == 0) {
83			state |= END;
84		} else if (state == NAMING &&
85			   (((*addr >= 'A') && (*addr <= 'Z')) ||
86			   ((*addr >= 'a') && (*addr <= 'z'))))
87			state |= LETTER;
88		else
89			state |= DELIM;
90		addr++;
91		switch (state /* | INPUT */) {
92		case NAMING | DIGIT:
93		case NAMING | LETTER:
94			*cp++ = addr[-1];
95			continue;
96		case NAMING | DELIM:
97			state = RESET;
98			sdl->sdl_nlen = cp - sdl->sdl_data;
99			continue;
100		case GOTTWO | DIGIT:
101			*cp++ = byte;
102			/* FALLTHROUGH */
103		case RESET | DIGIT:
104			state = GOTONE;
105			byte = newaddr;
106			continue;
107		case GOTONE | DIGIT:
108			state = GOTTWO;
109			byte = newaddr + (byte << 4);
110			continue;
111		default: /* | DELIM */
112			state = RESET;
113			*cp++ = byte;
114			byte = 0;
115			continue;
116		case GOTONE | END:
117		case GOTTWO | END:
118			*cp++ = byte;
119			/* FALLTHROUGH */
120		case RESET | END:
121			break;
122		}
123		break;
124	} while (cp < cplim);
125	sdl->sdl_alen = cp - LLADDR(sdl);
126	newaddr = cp - (char *)(void *)sdl;
127	if ((size_t) newaddr > sizeof(*sdl))
128		sdl->sdl_len = newaddr;
129	return;
130}
131
132static const char hexlist[16] = "0123456789abcdef";
133
134char *
135link_ntoa(sdl)
136	register const struct sockaddr_dl *sdl;
137{
138	static char obuf[64];
139	register char *out = obuf;
140	register size_t i;
141	const u_char *in = (const u_char *)CLLADDR(sdl);
142	const u_char *inlim = in + sdl->sdl_alen;
143	int firsttime = 1;
144
145	_DIAGASSERT(sdl != NULL);
146
147	if (sdl->sdl_nlen) {
148		(void)memcpy(obuf, sdl->sdl_data, (size_t)sdl->sdl_nlen);
149		out += sdl->sdl_nlen;
150		if (sdl->sdl_alen)
151			*out++ = ':';
152	}
153	while (in < inlim) {
154		if (firsttime)
155			firsttime = 0;
156		else
157			*out++ = '.';
158		i = *in++;
159		if (i > 0xf) {
160			out[1] = hexlist[i & 0xf];
161			i >>= 4;
162			out[0] = hexlist[i];
163			out += 2;
164		} else
165			*out++ = hexlist[i];
166	}
167	*out = 0;
168	return (obuf);
169}
170