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: src/lib/libc/net/linkaddr.c,v 1.4 2007/01/09 00:28:02 imp Exp $");
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(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 *)sdl;
59	int byte = 0, state = NAMING, new;
60
61	bzero((char *)&sdl->sdl_family, sdl->sdl_len - 1);
62	sdl->sdl_family = AF_LINK;
63	do {
64		state &= ~LETTER;
65		if ((*addr >= '0') && (*addr <= '9')) {
66			new = *addr - '0';
67		} else if ((*addr >= 'a') && (*addr <= 'f')) {
68			new = *addr - 'a' + 10;
69		} else if ((*addr >= 'A') && (*addr <= 'F')) {
70			new = *addr - 'A' + 10;
71		} else if (*addr == 0) {
72			state |= END;
73		} else if (state == NAMING &&
74			   (((*addr >= 'A') && (*addr <= 'Z')) ||
75			   ((*addr >= 'a') && (*addr <= 'z'))))
76			state |= LETTER;
77		else
78			state |= DELIM;
79		addr++;
80		switch (state /* | INPUT */) {
81		case NAMING | DIGIT:
82		case NAMING | LETTER:
83			*cp++ = addr[-1];
84			continue;
85		case NAMING | DELIM:
86			state = RESET;
87			sdl->sdl_nlen = cp - sdl->sdl_data;
88			continue;
89		case GOTTWO | DIGIT:
90			*cp++ = byte;
91			/* FALLTHROUGH */
92		case RESET | DIGIT:
93			state = GOTONE;
94			byte = new;
95			continue;
96		case GOTONE | DIGIT:
97			state = GOTTWO;
98			byte = new + (byte << 4);
99			continue;
100		default: /* | DELIM */
101			state = RESET;
102			*cp++ = byte;
103			byte = 0;
104			continue;
105		case GOTONE | END:
106		case GOTTWO | END:
107			*cp++ = byte;
108			/* FALLTHROUGH */
109		case RESET | END:
110			break;
111		}
112		break;
113	} while (cp < cplim);
114	sdl->sdl_alen = cp - LLADDR(sdl);
115	new = cp - (char *)sdl;
116	if (new > sizeof(*sdl))
117		sdl->sdl_len = new;
118	return;
119}
120
121static const char hexlist[] = "0123456789abcdef";
122
123char *
124link_ntoa(sdl)
125	const struct sockaddr_dl *sdl;
126{
127	static char obuf[64];
128	char *out = obuf;
129	int i;
130	u_char *in = (u_char *)LLADDR(sdl);
131	u_char *inlim = in + sdl->sdl_alen;
132	int firsttime = 1;
133
134	if (sdl->sdl_nlen) {
135		bcopy(sdl->sdl_data, obuf, sdl->sdl_nlen);
136		out += sdl->sdl_nlen;
137		if (sdl->sdl_alen)
138			*out++ = ':';
139	}
140	while (in < inlim) {
141		if (firsttime)
142			firsttime = 0;
143		else
144			*out++ = '.';
145		i = *in++;
146		if (i > 0xf) {
147			out[1] = hexlist[i & 0xf];
148			i >>= 4;
149			out[0] = hexlist[i];
150			out += 2;
151		} else
152			*out++ = hexlist[i];
153	}
154	*out = 0;
155	return (obuf);
156}
157