linkaddr.c revision 1573 
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. All advertising materials mentioning features or use of this software
14 *    must display the following acknowledgement:
15 *	This product includes software developed by the University of
16 *	California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 *    may be used to endorse or promote products derived from this software
19 *    without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34#if defined(LIBC_SCCS) && !defined(lint)
35static char sccsid[] = "@(#)linkaddr.c	8.1 (Berkeley) 6/4/93";
36#endif /* LIBC_SCCS and not lint */
37
38#include <sys/types.h>
39#include <sys/socket.h>
40#include <net/if_dl.h>
41#include <string.h>
42
43/* States*/
44#define NAMING	0
45#define GOTONE	1
46#define GOTTWO	2
47#define RESET	3
48/* Inputs */
49#define	DIGIT	(4*0)
50#define	END	(4*1)
51#define DELIM	(4*2)
52#define LETTER	(4*3)
53
54void
55link_addr(addr, sdl)
56	register const char *addr;
57	register struct sockaddr_dl *sdl;
58{
59	register char *cp = sdl->sdl_data;
60	char *cplim = sdl->sdl_len + (char *)sdl;
61	register int byte = 0, state = NAMING, new;
62
63	bzero((char *)&sdl->sdl_family, sdl->sdl_len - 1);
64	sdl->sdl_family = AF_LINK;
65	do {
66		state &= ~LETTER;
67		if ((*addr >= '0') && (*addr <= '9')) {
68			new = *addr - '0';
69		} else if ((*addr >= 'a') && (*addr <= 'f')) {
70			new = *addr - 'a' + 10;
71		} else if ((*addr >= 'A') && (*addr <= 'F')) {
72			new = *addr - 'A' + 10;
73		} else if (*addr == 0) {
74			state |= END;
75		} else if (state == NAMING &&
76			   (((*addr >= 'A') && (*addr <= 'Z')) ||
77			   ((*addr >= 'a') && (*addr <= 'z'))))
78			state |= LETTER;
79		else
80			state |= DELIM;
81		addr++;
82		switch (state /* | INPUT */) {
83		case NAMING | DIGIT:
84		case NAMING | LETTER:
85			*cp++ = addr[-1];
86			continue;
87		case NAMING | DELIM:
88			state = RESET;
89			sdl->sdl_nlen = cp - sdl->sdl_data;
90			continue;
91		case GOTTWO | DIGIT:
92			*cp++ = byte;
93			/* FALLTHROUGH */
94		case RESET | DIGIT:
95			state = GOTONE;
96			byte = new;
97			continue;
98		case GOTONE | DIGIT:
99			state = GOTTWO;
100			byte = new + (byte << 4);
101			continue;
102		default: /* | DELIM */
103			state = RESET;
104			*cp++ = byte;
105			byte = 0;
106			continue;
107		case GOTONE | END:
108		case GOTTWO | END:
109			*cp++ = byte;
110			/* FALLTHROUGH */
111		case RESET | END:
112			break;
113		}
114		break;
115	} while (cp < cplim);
116	sdl->sdl_alen = cp - LLADDR(sdl);
117	new = cp - (char *)sdl;
118	if (new > sizeof(*sdl))
119		sdl->sdl_len = new;
120	return;
121}
122
123static char hexlist[] = "0123456789abcdef";
124
125char *
126link_ntoa(sdl)
127	register const struct sockaddr_dl *sdl;
128{
129	static char obuf[64];
130	register char *out = obuf;
131	register int i;
132	register u_char *in = (u_char *)LLADDR(sdl);
133	u_char *inlim = in + sdl->sdl_alen;
134	int firsttime = 1;
135
136	if (sdl->sdl_nlen) {
137		bcopy(sdl->sdl_data, obuf, sdl->sdl_nlen);
138		out += sdl->sdl_nlen;
139		if (sdl->sdl_alen)
140			*out++ = ':';
141	}
142	while (in < inlim) {
143		if (firsttime)
144			firsttime = 0;
145		else
146			*out++ = '.';
147		i = *in++;
148		if (i > 0xf) {
149			out[1] = hexlist[i & 0xf];
150			i >>= 4;
151			out[0] = hexlist[i];
152			out += 2;
153		} else
154			*out++ = hexlist[i];
155	}
156	*out = 0;
157	return (obuf);
158}
159