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/* $OpenBSD: linkaddr.c,v 1.5 2005/08/06 20:30:03 espie Exp $ */
/*-
* Copyright (c) 1990, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/types.h>
#include <sys/socket.h>
#include <net/if_dl.h>
#include <string.h>
/* States*/
#define NAMING 0
#define GOTONE 1
#define GOTTWO 2
#define RESET 3
/* Inputs */
#define DIGIT (4*0)
#define END (4*1)
#define DELIM (4*2)
#define LETTER (4*3)
void
link_addr(const char *addr, struct sockaddr_dl *sdl)
{
char *cp = sdl->sdl_data;
char *cplim = sdl->sdl_len + (char *)sdl;
int byte = 0, state = NAMING, new;
bzero((char *)&sdl->sdl_family, sdl->sdl_len - 1);
sdl->sdl_family = AF_LINK;
do {
state &= ~LETTER;
if ((*addr >= '0') && (*addr <= '9')) {
new = *addr - '0';
} else if ((*addr >= 'a') && (*addr <= 'f')) {
new = *addr - 'a' + 10;
} else if ((*addr >= 'A') && (*addr <= 'F')) {
new = *addr - 'A' + 10;
} else if (*addr == 0) {
state |= END;
} else if (state == NAMING &&
(((*addr >= 'A') && (*addr <= 'Z')) ||
((*addr >= 'a') && (*addr <= 'z'))))
state |= LETTER;
else
state |= DELIM;
addr++;
switch (state /* | INPUT */) {
case NAMING | DIGIT:
case NAMING | LETTER:
*cp++ = addr[-1];
continue;
case NAMING | DELIM:
state = RESET;
sdl->sdl_nlen = cp - sdl->sdl_data;
continue;
case GOTTWO | DIGIT:
*cp++ = byte;
/* FALLTHROUGH */
case RESET | DIGIT:
state = GOTONE;
byte = new;
continue;
case GOTONE | DIGIT:
state = GOTTWO;
byte = new + (byte << 4);
continue;
default: /* | DELIM */
state = RESET;
*cp++ = byte;
byte = 0;
continue;
case GOTONE | END:
case GOTTWO | END:
*cp++ = byte;
/* FALLTHROUGH */
case RESET | END:
break;
}
break;
} while (cp < cplim);
sdl->sdl_alen = cp - LLADDR(sdl);
new = cp - (char *)sdl;
if (new > sizeof(*sdl))
sdl->sdl_len = new;
return;
}
static char hexlist[] = "0123456789abcdef";
char *
link_ntoa(const struct sockaddr_dl *sdl)
{
static char obuf[64];
char *out = obuf;
int i;
u_char *in = (u_char *)LLADDR(sdl);
u_char *inlim = in + sdl->sdl_alen;
int firsttime = 1;
if (sdl->sdl_nlen) {
bcopy(sdl->sdl_data, obuf, sdl->sdl_nlen);
out += sdl->sdl_nlen;
if (sdl->sdl_alen)
*out++ = ':';
}
while (in < inlim) {
if (firsttime)
firsttime = 0;
else
*out++ = '.';
i = *in++;
if (i > 0xf) {
out[1] = hexlist[i & 0xf];
i >>= 4;
out[0] = hexlist[i];
out += 2;
} else
*out++ = hexlist[i];
}
*out = 0;
return (obuf);
}
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