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linkaddr.c revision 1.5.4.1 
      1 /*	$NetBSD: linkaddr.c,v 1.5.4.1 1996/09/20 17:00:38 jtc 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. All advertising materials mentioning features or use of this software
     16  *    must display the following acknowledgement:
     17  *	This product includes software developed by the University of
     18  *	California, Berkeley and its contributors.
     19  * 4. Neither the name of the University nor the names of its contributors
     20  *    may be used to endorse or promote products derived from this software
     21  *    without specific prior written permission.
     22  *
     23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     33  * SUCH DAMAGE.
     34  */
     35 
     36 #if defined(LIBC_SCCS) && !defined(lint)
     37 #if 0
     38 static char sccsid[] = "@(#)linkaddr.c	8.1 (Berkeley) 6/4/93";
     39 #else
     40 static char rcsid[] = "$NetBSD: linkaddr.c,v 1.5.4.1 1996/09/20 17:00:38 jtc Exp $";
     41 #endif
     42 #endif /* LIBC_SCCS and not lint */
     43 
     44 #include "namespace.h"
     45 #include <sys/types.h>
     46 #include <sys/socket.h>
     47 #include <net/if_dl.h>
     48 #include <string.h>
     49 
     50 #ifdef __weak_alias
     51 __weak_alias(link_addr,_link_addr);
     52 __weak_alias(link_ntoa,_link_ntoa);
     53 #endif
     54 
     55 /* States*/
     56 #define NAMING	0
     57 #define GOTONE	1
     58 #define GOTTWO	2
     59 #define RESET	3
     60 /* Inputs */
     61 #define	DIGIT	(4*0)
     62 #define	END	(4*1)
     63 #define DELIM	(4*2)
     64 #define LETTER	(4*3)
     65 
     66 void
     67 link_addr(addr, sdl)
     68 	register const char *addr;
     69 	register struct sockaddr_dl *sdl;
     70 {
     71 	register char *cp = sdl->sdl_data;
     72 	char *cplim = sdl->sdl_len + (char *)sdl;
     73 	register int byte = 0, state = NAMING, new;
     74 
     75 	memset((char *)&sdl->sdl_family, 0, sdl->sdl_len - 1);
     76 	sdl->sdl_family = AF_LINK;
     77 	do {
     78 		state &= ~LETTER;
     79 		if ((*addr >= '0') && (*addr <= '9')) {
     80 			new = *addr - '0';
     81 		} else if ((*addr >= 'a') && (*addr <= 'f')) {
     82 			new = *addr - 'a' + 10;
     83 		} else if ((*addr >= 'A') && (*addr <= 'F')) {
     84 			new = *addr - 'A' + 10;
     85 		} else if (*addr == 0) {
     86 			state |= END;
     87 		} else if (state == NAMING &&
     88 			   (((*addr >= 'A') && (*addr <= 'Z')) ||
     89 			   ((*addr >= 'a') && (*addr <= 'z'))))
     90 			state |= LETTER;
     91 		else
     92 			state |= DELIM;
     93 		addr++;
     94 		switch (state /* | INPUT */) {
     95 		case NAMING | DIGIT:
     96 		case NAMING | LETTER:
     97 			*cp++ = addr[-1];
     98 			continue;
     99 		case NAMING | DELIM:
    100 			state = RESET;
    101 			sdl->sdl_nlen = cp - sdl->sdl_data;
    102 			continue;
    103 		case GOTTWO | DIGIT:
    104 			*cp++ = byte;
    105 			/* FALLTHROUGH */
    106 		case RESET | DIGIT:
    107 			state = GOTONE;
    108 			byte = new;
    109 			continue;
    110 		case GOTONE | DIGIT:
    111 			state = GOTTWO;
    112 			byte = new + (byte << 4);
    113 			continue;
    114 		default: /* | DELIM */
    115 			state = RESET;
    116 			*cp++ = byte;
    117 			byte = 0;
    118 			continue;
    119 		case GOTONE | END:
    120 		case GOTTWO | END:
    121 			*cp++ = byte;
    122 			/* FALLTHROUGH */
    123 		case RESET | END:
    124 			break;
    125 		}
    126 		break;
    127 	} while (cp < cplim);
    128 	sdl->sdl_alen = cp - LLADDR(sdl);
    129 	new = cp - (char *)sdl;
    130 	if (new > sizeof(*sdl))
    131 		sdl->sdl_len = new;
    132 	return;
    133 }
    134 
    135 static char hexlist[] = "0123456789abcdef";
    136 
    137 char *
    138 link_ntoa(sdl)
    139 	register const struct sockaddr_dl *sdl;
    140 {
    141 	static char obuf[64];
    142 	register char *out = obuf;
    143 	register int i;
    144 	register u_char *in = (u_char *)LLADDR(sdl);
    145 	u_char *inlim = in + sdl->sdl_alen;
    146 	int firsttime = 1;
    147 
    148 	if (sdl->sdl_nlen) {
    149 		bcopy(sdl->sdl_data, obuf, sdl->sdl_nlen);
    150 		out += sdl->sdl_nlen;
    151 		if (sdl->sdl_alen)
    152 			*out++ = ':';
    153 	}
    154 	while (in < inlim) {
    155 		if (firsttime)
    156 			firsttime = 0;
    157 		else
    158 			*out++ = '.';
    159 		i = *in++;
    160 		if (i > 0xf) {
    161 			out[1] = hexlist[i & 0xf];
    162 			i >>= 4;
    163 			out[0] = hexlist[i];
    164 			out += 2;
    165 		} else
    166 			*out++ = hexlist[i];
    167 	}
    168 	*out = 0;
    169 	return (obuf);
    170 }
    171