1 /* $NetBSD: linkaddr.c,v 1.14 2005/11/29 03:11:59 christos Exp $ */ 2 3 /*- 4 * Copyright (c) 1990, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #include <sys/cdefs.h> 33 #if defined(LIBC_SCCS) && !defined(lint) 34 #if 0 35 static char sccsid[] = "@(#)linkaddr.c 8.1 (Berkeley) 6/4/93"; 36 #else 37 __RCSID("$NetBSD: linkaddr.c,v 1.14 2005/11/29 03:11:59 christos Exp $"); 38 #endif 39 #endif /* LIBC_SCCS and not lint */ 40 41 #include <sys/types.h> 42 #include <sys/socket.h> 43 #include <net/if_dl.h> 44 45 #include <assert.h> 46 #include <string.h> 47 48 /* States*/ 49 #define NAMING 0 50 #define GOTONE 1 51 #define GOTTWO 2 52 #define RESET 3 53 /* Inputs */ 54 #define DIGIT (4*0) 55 #define END (4*1) 56 #define DELIM (4*2) 57 #define LETTER (4*3) 58 59 void 60 link_addr(addr, sdl) 61 register const char *addr; 62 register struct sockaddr_dl *sdl; 63 { 64 register char *cp = sdl->sdl_data; 65 char *cplim = sdl->sdl_len + (char *)(void *)sdl; 66 register int byte = 0, state = NAMING; 67 register int newaddr = 0; /* pacify gcc */ 68 69 _DIAGASSERT(addr != NULL); 70 _DIAGASSERT(sdl != NULL); 71 72 (void)memset(&sdl->sdl_family, 0, (size_t)sdl->sdl_len - 1); 73 sdl->sdl_family = AF_LINK; 74 do { 75 state &= ~LETTER; 76 if ((*addr >= '0') && (*addr <= '9')) { 77 newaddr = *addr - '0'; 78 } else if ((*addr >= 'a') && (*addr <= 'f')) { 79 newaddr = *addr - 'a' + 10; 80 } else if ((*addr >= 'A') && (*addr <= 'F')) { 81 newaddr = *addr - 'A' + 10; 82 } else if (*addr == 0) { 83 state |= END; 84 } else if (state == NAMING && 85 (((*addr >= 'A') && (*addr <= 'Z')) || 86 ((*addr >= 'a') && (*addr <= 'z')))) 87 state |= LETTER; 88 else 89 state |= DELIM; 90 addr++; 91 switch (state /* | INPUT */) { 92 case NAMING | DIGIT: 93 case NAMING | LETTER: 94 *cp++ = addr[-1]; 95 continue; 96 case NAMING | DELIM: 97 state = RESET; 98 sdl->sdl_nlen = cp - sdl->sdl_data; 99 continue; 100 case GOTTWO | DIGIT: 101 *cp++ = byte; 102 /* FALLTHROUGH */ 103 case RESET | DIGIT: 104 state = GOTONE; 105 byte = newaddr; 106 continue; 107 case GOTONE | DIGIT: 108 state = GOTTWO; 109 byte = newaddr + (byte << 4); 110 continue; 111 default: /* | DELIM */ 112 state = RESET; 113 *cp++ = byte; 114 byte = 0; 115 continue; 116 case GOTONE | END: 117 case GOTTWO | END: 118 *cp++ = byte; 119 /* FALLTHROUGH */ 120 case RESET | END: 121 break; 122 } 123 break; 124 } while (cp < cplim); 125 sdl->sdl_alen = cp - LLADDR(sdl); 126 newaddr = cp - (char *)(void *)sdl; 127 if ((size_t) newaddr > sizeof(*sdl)) 128 sdl->sdl_len = newaddr; 129 return; 130 } 131 132 static const char hexlist[16] = "0123456789abcdef"; 133 134 char * 135 link_ntoa(sdl) 136 register const struct sockaddr_dl *sdl; 137 { 138 static char obuf[64]; 139 register char *out = obuf; 140 register size_t i; 141 const u_char *in = (const u_char *)CLLADDR(sdl); 142 const u_char *inlim = in + sdl->sdl_alen; 143 int firsttime = 1; 144 145 _DIAGASSERT(sdl != NULL); 146 147 if (sdl->sdl_nlen) { 148 (void)memcpy(obuf, sdl->sdl_data, (size_t)sdl->sdl_nlen); 149 out += sdl->sdl_nlen; 150 if (sdl->sdl_alen) 151 *out++ = ':'; 152 } 153 while (in < inlim) { 154 if (firsttime) 155 firsttime = 0; 156 else 157 *out++ = '.'; 158 i = *in++; 159 if (i > 0xf) { 160 out[1] = hexlist[i & 0xf]; 161 i >>= 4; 162 out[0] = hexlist[i]; 163 out += 2; 164 } else 165 *out++ = hexlist[i]; 166 } 167 *out = 0; 168 return (obuf); 169 } 170