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/* $OpenBSD: linkaddr.c,v 1.9 2016/12/08 03:20:50 millert 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.h>
#include <net/if_dl.h>
#include <string.h>
static const char hexlist[] = "0123456789abcdef";
char *
link_ntoa(const struct sockaddr_dl *sdl)
{
static char obuf[64];
char *out;
const u_char *in, *inlim;
int namelen, i, rem;
namelen = (sdl->sdl_nlen <= IFNAMSIZ) ? sdl->sdl_nlen : IFNAMSIZ;
out = obuf;
rem = sizeof(obuf);
if (namelen > 0) {
memcpy(out, sdl->sdl_data, namelen);
out += namelen;
rem -= namelen;
if (sdl->sdl_alen > 0) {
*out++ = ':';
rem--;
}
}
in = (const u_char *)sdl->sdl_data + sdl->sdl_nlen;
inlim = in + sdl->sdl_alen;
while (in < inlim && rem > 1) {
if (in != (const u_char *)sdl->sdl_data + sdl->sdl_nlen) {
*out++ = '.';
rem--;
}
i = *in++;
if (i > 0xf) {
if (rem < 3)
break;
*out++ = hexlist[i >> 4];
*out++ = hexlist[i & 0xf];
rem -= 2;
} else {
if (rem < 2)
break;
*out++ = hexlist[i];
rem--;
}
}
*out = 0;
return (obuf);
}
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