1 /* $OpenBSD: linkaddr.c,v 1.6 2015/09/10 08:55:03 mpi Exp $ */ 2 /*- 3 * Copyright (c) 1990, 1993 4 * The Regents of the University of California. All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 3. Neither the name of the University nor the names of its contributors 15 * may be used to endorse or promote products derived from this software 16 * without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28 * SUCH DAMAGE. 29 */ 30 31 #include <sys/types.h> 32 #include <sys/socket.h> 33 #include <net/if_dl.h> 34 #include <string.h> 35 36 static char hexlist[] = "0123456789abcdef"; 37 38 char * 39 link_ntoa(const struct sockaddr_dl *sdl) 40 { 41 static char obuf[64]; 42 char *out = obuf; 43 int i; 44 u_char *in = (u_char *)LLADDR(sdl); 45 u_char *inlim = in + sdl->sdl_alen; 46 int firsttime = 1; 47 48 if (sdl->sdl_nlen) { 49 bcopy(sdl->sdl_data, obuf, sdl->sdl_nlen); 50 out += sdl->sdl_nlen; 51 if (sdl->sdl_alen) 52 *out++ = ':'; 53 } 54 while (in < inlim) { 55 if (firsttime) 56 firsttime = 0; 57 else 58 *out++ = '.'; 59 i = *in++; 60 if (i > 0xf) { 61 out[1] = hexlist[i & 0xf]; 62 i >>= 4; 63 out[0] = hexlist[i]; 64 out += 2; 65 } else 66 *out++ = hexlist[i]; 67 } 68 *out = 0; 69 return (obuf); 70 } 71