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/* $OpenBSD: linkaddr.c,v 1.9 2016/12/08 03:20:50 millert Exp $ */ |
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/*- |
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* Copyright (c) 1990, 1993 |
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* The Regents of the University of California. All rights reserved. |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions |
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* are met: |
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* 1. Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* 2. Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in the |
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* documentation and/or other materials provided with the distribution. |
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* 3. Neither the name of the University nor the names of its contributors |
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* may be used to endorse or promote products derived from this software |
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* without specific prior written permission. |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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* SUCH DAMAGE. |
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*/ |
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#include <sys/types.h> |
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#include <sys/socket.h> |
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#include <net/if.h> |
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#include <net/if_dl.h> |
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#include <string.h> |
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static const char hexlist[] = "0123456789abcdef"; |
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char * |
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link_ntoa(const struct sockaddr_dl *sdl) |
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{ |
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static char obuf[64]; |
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char *out; |
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const u_char *in, *inlim; |
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int namelen, i, rem; |
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namelen = (sdl->sdl_nlen <= IFNAMSIZ) ? sdl->sdl_nlen : IFNAMSIZ; |
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out = obuf; |
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rem = sizeof(obuf); |
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if (namelen > 0) { |
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memcpy(out, sdl->sdl_data, namelen); |
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out += namelen; |
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rem -= namelen; |
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if (sdl->sdl_alen > 0) { |
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*out++ = ':'; |
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rem--; |
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} |
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} |
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in = (const u_char *)sdl->sdl_data + sdl->sdl_nlen; |
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inlim = in + sdl->sdl_alen; |
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while (in < inlim && rem > 1) { |
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if (in != (const u_char *)sdl->sdl_data + sdl->sdl_nlen) { |
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*out++ = '.'; |
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rem--; |
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} |
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i = *in++; |
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if (i > 0xf) { |
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if (rem < 3) |
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break; |
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*out++ = hexlist[i >> 4]; |
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*out++ = hexlist[i & 0xf]; |
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rem -= 2; |
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} else { |
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if (rem < 2) |
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break; |
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*out++ = hexlist[i]; |
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rem--; |
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} |
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} |
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*out = 0; |
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return (obuf); |
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} |