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linkaddr.c revision 1.1 
      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[] = "@(#)linkaddr.c	5.2 (Berkeley) 2/24/91";
     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 
     54 void
     55 link_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]; continue;
     86 		case NAMING | DELIM:
     87 			state = RESET; sdl->sdl_nlen = cp - sdl->sdl_data; continue;
     88 		case GOTTWO | DIGIT:
     89 			*cp++ = byte; /*FALLTHROUGH*/
     90 		case RESET | DIGIT:
     91 			state = GOTONE; byte = new; continue;
     92 		case GOTONE | DIGIT:
     93 			state = GOTTWO; byte = new + (byte << 4); continue;
     94 		default: /* | DELIM */
     95 			state = RESET; *cp++ = byte; byte = 0; continue;
     96 		case GOTONE | END:
     97 		case GOTTWO | END:
     98 			*cp++ = byte; /* FALLTHROUGH */
     99 		case RESET | END:
    100 			break;
    101 		}
    102 		break;
    103 	} while (cp < cplim);
    104 	sdl->sdl_alen = cp - LLADDR(sdl);
    105 	new = cp - (char *)sdl;
    106 	if (new > sizeof(*sdl))
    107 		sdl->sdl_len = new;
    108 	return;
    109 }
    110 
    111 static char hexlist[] = "0123456789abcdef";
    112 
    113 char *
    114 link_ntoa(sdl)
    115 	register const struct sockaddr_dl *sdl;
    116 {
    117 	static char obuf[64];
    118 	register char *out = obuf;
    119 	register int i;
    120 	register u_char *in = (u_char *)LLADDR(sdl);
    121 	u_char *inlim = in + sdl->sdl_nlen;
    122 	int firsttime = 1;
    123 
    124 	if (sdl->sdl_nlen) {
    125 		bcopy(sdl->sdl_data, obuf, sdl->sdl_nlen);
    126 		out += sdl->sdl_nlen;
    127 		*out++ = ':';
    128 	}
    129 	while (in < inlim) {
    130 		if (firsttime) firsttime = 0; else *out++ = '.';
    131 		i = *in++;
    132 		if (i > 0xf) {
    133 			out[1] = hexlist[i & 0xf];
    134 			i >>= 4;
    135 			out[0] = hexlist[i];
    136 			out += 2;
    137 		} else
    138 			*out++ = hexlist[i];
    139 	}
    140 	*out = 0;
    141 	return(obuf);
    142 }
    143