1/*- 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. 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 30#if defined(LIBC_SCCS) && !defined(lint) 31static char sccsid[] = "@(#)linkaddr.c 8.1 (Berkeley) 6/4/93"; 32#endif /* LIBC_SCCS and not lint */ 33#include <sys/cdefs.h> 34__FBSDID("$FreeBSD: releng/10.1/lib/libc/net/linkaddr.c 309696 2016-12-07 23:34:06Z glebius $"); 35 36#include <sys/types.h> 37#include <sys/socket.h> 38#include <net/if.h> 39#include <net/if_dl.h> 40#include <string.h> 41 42/* States*/ 43#define NAMING 0 44#define GOTONE 1 45#define GOTTWO 2 46#define RESET 3 47/* Inputs */ 48#define DIGIT (4*0) 49#define END (4*1) 50#define DELIM (4*2) 51#define LETTER (4*3) 52 53void 54link_addr(addr, sdl) 55 const char *addr; 56 struct sockaddr_dl *sdl; 57{ 58 char *cp = sdl->sdl_data; 59 char *cplim = sdl->sdl_len + (char *)sdl; 60 int byte = 0, state = NAMING, new; 61 62 bzero((char *)&sdl->sdl_family, sdl->sdl_len - 1); 63 sdl->sdl_family = AF_LINK; 64 do { 65 state &= ~LETTER; 66 if ((*addr >= '0') && (*addr <= '9')) { 67 new = *addr - '0'; 68 } else if ((*addr >= 'a') && (*addr <= 'f')) { 69 new = *addr - 'a' + 10; 70 } else if ((*addr >= 'A') && (*addr <= 'F')) { 71 new = *addr - 'A' + 10; 72 } else if (*addr == 0) { 73 state |= END; 74 } else if (state == NAMING && 75 (((*addr >= 'A') && (*addr <= 'Z')) || 76 ((*addr >= 'a') && (*addr <= 'z')))) 77 state |= LETTER; 78 else 79 state |= DELIM; 80 addr++; 81 switch (state /* | INPUT */) { 82 case NAMING | DIGIT: 83 case NAMING | LETTER: 84 *cp++ = addr[-1]; 85 continue; 86 case NAMING | DELIM: 87 state = RESET; 88 sdl->sdl_nlen = cp - sdl->sdl_data; 89 continue; 90 case GOTTWO | DIGIT: 91 *cp++ = byte; 92 /* FALLTHROUGH */ 93 case RESET | DIGIT: 94 state = GOTONE; 95 byte = new; 96 continue; 97 case GOTONE | DIGIT: 98 state = GOTTWO; 99 byte = new + (byte << 4); 100 continue; 101 default: /* | DELIM */ 102 state = RESET; 103 *cp++ = byte; 104 byte = 0; 105 continue; 106 case GOTONE | END: 107 case GOTTWO | END: 108 *cp++ = byte; 109 /* FALLTHROUGH */ 110 case RESET | END: 111 break; 112 } 113 break; 114 } while (cp < cplim); 115 sdl->sdl_alen = cp - LLADDR(sdl); 116 new = cp - (char *)sdl; 117 if (new > sizeof(*sdl)) 118 sdl->sdl_len = new; 119 return; 120} 121 122static const char hexlist[] = "0123456789abcdef"; 123 124char * 125link_ntoa(sdl) 126 const struct sockaddr_dl *sdl; 127{ 128 static char obuf[64]; 129 _Static_assert(sizeof(obuf) >= IFNAMSIZ + 20, "obuf is too small"); 130 char *out; 131 const u_char *in, *inlim; 132 int namelen, i, rem; 133 134 namelen = (sdl->sdl_nlen <= IFNAMSIZ) ? sdl->sdl_nlen : IFNAMSIZ; 135 136 out = obuf; 137 rem = sizeof(obuf); 138 if (namelen > 0) { 139 bcopy(sdl->sdl_data, out, namelen); 140 out += namelen; 141 rem -= namelen; 142 if (sdl->sdl_alen > 0) { 143 *out++ = ':'; 144 rem--; 145 } 146 } 147 148 in = (const u_char *)sdl->sdl_data + sdl->sdl_nlen; 149 inlim = in + sdl->sdl_alen; 150 151 while (in < inlim && rem > 1) { 152 if (in != (const u_char *)sdl->sdl_data + sdl->sdl_nlen) { 153 *out++ = '.'; 154 rem--; 155 } 156 i = *in++; 157 if (i > 0xf) { 158 if (rem < 3) 159 break; 160 *out++ = hexlist[i >> 4]; 161 *out++ = hexlist[i & 0xf]; 162 rem -= 2; 163 } else { 164 if (rem < 2) 165 break; 166 *out++ = hexlist[i]; 167 rem--; 168 } 169 } 170 *out = 0; 171 return (obuf); 172} 173