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Commit	Line	Data
9385eb3d	1	/*-
e9ce8d39 A	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.
e9ce8d39 A	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
9385eb3d A	30	#if defined(LIBC_SCCS) && !defined(lint)
	31	static char sccsid[] = "@(#)linkaddr.c 8.1 (Berkeley) 6/4/93";
	32	#endif /* LIBC_SCCS and not lint */
	33	#include <sys/cdefs.h>
34e8f829	34	__FBSDID("$FreeBSD: src/lib/libc/net/linkaddr.c,v 1.4 2007/01/09 00:28:02 imp Exp $");
e9ce8d39 A	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
	52	void
974e3884	53	link_addr(const char addr, struct sockaddr_dl sdl)
e9ce8d39	54	{
9385eb3d	55	char *cp = sdl->sdl_data;
e9ce8d39	56	char cplim = sdl->sdl_len + (char )sdl;
9385eb3d	57	int byte = 0, state = NAMING, new;
e9ce8d39 A	58
	59	bzero((char *)&sdl->sdl_family, sdl->sdl_len - 1);
	60	sdl->sdl_family = AF_LINK;
	61	do {
	62	state &= ~LETTER;
	63	if ((addr >= '0') && (addr <= '9')) {
	64	new = *addr - '0';
	65	} else if ((addr >= 'a') && (addr <= 'f')) {
	66	new = *addr - 'a' + 10;
	67	} else if ((addr >= 'A') && (addr <= 'F')) {
	68	new = *addr - 'A' + 10;
	69	} else if (*addr == 0) {
	70	state \|= END;
	71	} else if (state == NAMING &&
	72	(((addr >= 'A') && (addr <= 'Z')) \|\|
	73	((addr >= 'a') && (addr <= 'z'))))
	74	state \|= LETTER;
	75	else
	76	state \|= DELIM;
	77	addr++;
	78	switch (state /* \| INPUT */) {
	79	case NAMING \| DIGIT:
	80	case NAMING \| LETTER:
	81	*cp++ = addr[-1];
	82	continue;
	83	case NAMING \| DELIM:
	84	state = RESET;
	85	sdl->sdl_nlen = cp - sdl->sdl_data;
	86	continue;
	87	case GOTTWO \| DIGIT:
	88	*cp++ = byte;
	89	/* FALLTHROUGH */
	90	case RESET \| DIGIT:
	91	state = GOTONE;
	92	byte = new;
	93	continue;
	94	case GOTONE \| DIGIT:
	95	state = GOTTWO;
	96	byte = new + (byte << 4);
	97	continue;
	98	default: /* \| DELIM */
	99	state = RESET;
	100	*cp++ = byte;
	101	byte = 0;
	102	continue;
	103	case GOTONE \| END:
	104	case GOTTWO \| END:
	105	*cp++ = byte;
	106	/* FALLTHROUGH */
	107	case RESET \| END:
	108	break;
	109	}
	110	break;
9385eb3d	111	} while (cp < cplim);
e9ce8d39 A	112	sdl->sdl_alen = cp - LLADDR(sdl);
	113	new = cp - (char *)sdl;
	114	if (new > sizeof(*sdl))
	115	sdl->sdl_len = new;
	116	return;
	117	}
	118
6465356a	119	static const char hexlist[] = "0123456789abcdef";
e9ce8d39 A	120
e9ce8d39 A	121	char *
974e3884	122	link_ntoa(const struct sockaddr_dl *sdl)
e9ce8d39 A	123	{
e9ce8d39 A	124	static char obuf[64];
9385eb3d A	125	char *out = obuf;
	126	int i;
	127	u_char in = (u_char )LLADDR(sdl);
e9ce8d39 A	128	u_char *inlim = in + sdl->sdl_alen;
	129	int firsttime = 1;
	130
974e3884 A	131	/*
	132	* the length of the output string is length of network name (eg "le0")
	133	* plus 3 * each byte (eg. "XX.") assuming the print representation is
	134	* two bytes plus the period
	135	*
	136	* The ":" is accounted for as the last byte doesn't have a "." at the
	137	* end
	138	*/
	139	if (sdl->sdl_nlen + 3*sdl->sdl_alen >= sizeof(obuf)) {
	140	goto exit;
	141	}
	142
e9ce8d39 A	143	if (sdl->sdl_nlen) {
	144	bcopy(sdl->sdl_data, obuf, sdl->sdl_nlen);
	145	out += sdl->sdl_nlen;
	146	if (sdl->sdl_alen)
	147	*out++ = ':';
	148	}
	149	while (in < inlim) {
	150	if (firsttime)
	151	firsttime = 0;
	152	else
	153	*out++ = '.';
	154	i = *in++;
	155	if (i > 0xf) {
	156	out[1] = hexlist[i & 0xf];
	157	i >>= 4;
	158	out[0] = hexlist[i];
	159	out += 2;
974e3884	160	} else {
e9ce8d39	161	*out++ = hexlist[i];
974e3884	162	}
e9ce8d39	163	}
974e3884 A	164
974e3884 A	165	exit:
e9ce8d39 A	166	*out = 0;
	167	return (obuf);
	168	}