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linkaddr.c revision 1.4 
      1 /*-
      2  * Copyright (c) 1990 The Regents of the University of California.
      3  * 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)
     35 /*static char *sccsid = "from: @(#)linkaddr.c	5.2 (Berkeley) 2/24/91";*/
     36 static char *rcsid = "$Id: linkaddr.c,v 1.4 1994/10/19 03:19:42 cgd Exp $";
     37 #endif /* LIBC_SCCS and not lint */
     38 
     39 #include <sys/types.h>
     40 #include <sys/socket.h>
     41 #include <net/if_dl.h>
     42 #include <string.h>
     43 
     44 /* States*/
     45 #define NAMING	0
     46 #define GOTONE	1
     47 #define GOTTWO	2
     48 #define RESET	3
     49 /* Inputs */
     50 #define	DIGIT	(4*0)
     51 #define	END	(4*1)
     52 #define DELIM	(4*2)
     53 #define LETTER	(4*3)
     54 
     55 void
     56 link_addr(addr, sdl)
     57 	register const char *addr;
     58 	register struct sockaddr_dl *sdl;
     59 {
     60 	register char *cp = sdl->sdl_data;
     61 	char *cplim = sdl->sdl_len + (char *)sdl;
     62 	register int byte = 0, state = NAMING, new;
     63 
     64 	bzero((char *)&sdl->sdl_family, sdl->sdl_len - 1);
     65 	sdl->sdl_family = AF_LINK;
     66 	do {
     67 		state &= ~LETTER;
     68 		if ((*addr >= '0') && (*addr <= '9')) {
     69 			new = *addr - '0';
     70 		} else if ((*addr >= 'a') && (*addr <= 'f')) {
     71 			new = *addr - 'a' + 10;
     72 		} else if ((*addr >= 'A') && (*addr <= 'F')) {
     73 			new = *addr - 'A' + 10;
     74 		} else if (*addr == 0) {
     75 			state |= END;
     76 		} else if (state == NAMING &&
     77 			   (((*addr >= 'A') && (*addr <= 'Z')) ||
     78 			   ((*addr >= 'a') && (*addr <= 'z'))))
     79 			state |= LETTER;
     80 		else
     81 			state |= DELIM;
     82 		addr++;
     83 		switch (state /* | INPUT */) {
     84 		case NAMING | DIGIT:
     85 		case NAMING | LETTER:
     86 			*cp++ = addr[-1]; continue;
     87 		case NAMING | DELIM:
     88 			state = RESET; sdl->sdl_nlen = (long)cp - (long)sdl->sdl_data; continue;
     89 		case GOTTWO | DIGIT:
     90 			*cp++ = byte; /*FALLTHROUGH*/
     91 		case RESET | DIGIT:
     92 			state = GOTONE; byte = new; continue;
     93 		case GOTONE | DIGIT:
     94 			state = GOTTWO; byte = new + (byte << 4); continue;
     95 		default: /* | DELIM */
     96 			state = RESET; *cp++ = byte; byte = 0; continue;
     97 		case GOTONE | END:
     98 		case GOTTWO | END:
     99 			*cp++ = byte; /* FALLTHROUGH */
    100 		case RESET | END:
    101 			break;
    102 		}
    103 		break;
    104 	} while (cp < cplim);
    105 	sdl->sdl_alen = cp - LLADDR(sdl);
    106 	new = cp - (char *)sdl;
    107 	if (new > sizeof(*sdl))
    108 		sdl->sdl_len = new;
    109 	return;
    110 }
    111 
    112 static char hexlist[] = "0123456789abcdef";
    113 
    114 char *
    115 link_ntoa(sdl)
    116 	register const struct sockaddr_dl *sdl;
    117 {
    118 	static char obuf[64];
    119 	register char *out = obuf;
    120 	register int i;
    121 	register u_char *in = (u_char *)LLADDR(sdl);
    122 	u_char *inlim = in + sdl->sdl_nlen;
    123 	int firsttime = 1;
    124 
    125 	if (sdl->sdl_nlen) {
    126 		bcopy(sdl->sdl_data, obuf, sdl->sdl_nlen);
    127 		out += sdl->sdl_nlen;
    128 		*out++ = ':';
    129 	}
    130 	while (in < inlim) {
    131 		if (firsttime) firsttime = 0; else *out++ = '.';
    132 		i = *in++;
    133 		if (i > 0xf) {
    134 			out[1] = hexlist[i & 0xf];
    135 			i >>= 4;
    136 			out[0] = hexlist[i];
    137 			out += 2;
    138 		} else
    139 			*out++ = hexlist[i];
    140 	}
    141 	*out = 0;
    142 	return(obuf);
    143 }
    144