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