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 * 4. 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#if defined(LIBC_SCCS) && !defined(lint)
31static char sccsid[] = "@(#)linkaddr.c	8.1 (Berkeley) 6/4/93";
32#endif /* LIBC_SCCS and not lint */
33#include <sys/cdefs.h>
34__FBSDID("$FreeBSD$");
35
36#include <sys/types.h>
37#include <sys/socket.h>
38#include <net/if_dl.h>
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(const char *addr, struct sockaddr_dl *sdl)
54{
55	char *cp = sdl->sdl_data;
56	char *cplim = sdl->sdl_len + (char *)sdl;
57	int byte = 0, state = NAMING, new;
58
59	bzero((char *)&sdl->sdl_family, sdl->sdl_len - 1);
60	sdl->sdl_family = AF_LINK;
61	do {
62		state &= ~LETTER;
63		if ((*addr >= '0') && (*addr <= '9')) {
64			new = *addr - '0';
65		} else if ((*addr >= 'a') && (*addr <= 'f')) {
66			new = *addr - 'a' + 10;
67		} else if ((*addr >= 'A') && (*addr <= 'F')) {
68			new = *addr - 'A' + 10;
69		} else if (*addr == 0) {
70			state |= END;
71		} else if (state == NAMING &&
72			   (((*addr >= 'A') && (*addr <= 'Z')) ||
73			   ((*addr >= 'a') && (*addr <= 'z'))))
74			state |= LETTER;
75		else
76			state |= DELIM;
77		addr++;
78		switch (state /* | INPUT */) {
79		case NAMING | DIGIT:
80		case NAMING | LETTER:
81			*cp++ = addr[-1];
82			continue;
83		case NAMING | DELIM:
84			state = RESET;
85			sdl->sdl_nlen = cp - sdl->sdl_data;
86			continue;
87		case GOTTWO | DIGIT:
88			*cp++ = byte;
89			/* FALLTHROUGH */
90		case RESET | DIGIT:
91			state = GOTONE;
92			byte = new;
93			continue;
94		case GOTONE | DIGIT:
95			state = GOTTWO;
96			byte = new + (byte << 4);
97			continue;
98		default: /* | DELIM */
99			state = RESET;
100			*cp++ = byte;
101			byte = 0;
102			continue;
103		case GOTONE | END:
104		case GOTTWO | END:
105			*cp++ = byte;
106			/* FALLTHROUGH */
107		case RESET | END:
108			break;
109		}
110		break;
111	} while (cp < cplim);
112	sdl->sdl_alen = cp - LLADDR(sdl);
113	new = cp - (char *)sdl;
114	if (new > sizeof(*sdl))
115		sdl->sdl_len = new;
116	return;
117}
118
119static const char hexlist[] = "0123456789abcdef";
120
121char *
122link_ntoa(const struct sockaddr_dl *sdl)
123{
124	static char obuf[64];
125	char *out = obuf;
126	int i;
127	u_char *in = (u_char *)LLADDR(sdl);
128	u_char *inlim = in + sdl->sdl_alen;
129	int firsttime = 1;
130
131	if (sdl->sdl_nlen) {
132		bcopy(sdl->sdl_data, obuf, sdl->sdl_nlen);
133		out += sdl->sdl_nlen;
134		if (sdl->sdl_alen)
135			*out++ = ':';
136	}
137	while (in < inlim) {
138		if (firsttime)
139			firsttime = 0;
140		else
141			*out++ = '.';
142		i = *in++;
143		if (i > 0xf) {
144			out[1] = hexlist[i & 0xf];
145			i >>= 4;
146			out[0] = hexlist[i];
147			out += 2;
148		} else
149			*out++ = hexlist[i];
150	}
151	*out = 0;
152	return (obuf);
153}
154