1 /* $NetBSD: linkaddr.c,v 1.6 1997/07/13 19:57:52 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. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the University of 18 * California, Berkeley and its contributors. 19 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 #include <sys/cdefs.h> 37 #if defined(LIBC_SCCS) && !defined(lint) 38 #if 0 39 static char sccsid[] = "@(#)linkaddr.c 8.1 (Berkeley) 6/4/93"; 40 #else 41 __RCSID("$NetBSD: linkaddr.c,v 1.6 1997/07/13 19:57:52 christos Exp $"); 42 #endif 43 #endif /* LIBC_SCCS and not lint */ 44 45 #include <sys/types.h> 46 #include <sys/socket.h> 47 #include <net/if_dl.h> 48 #include <string.h> 49 50 /* States*/ 51 #define NAMING 0 52 #define GOTONE 1 53 #define GOTTWO 2 54 #define RESET 3 55 /* Inputs */ 56 #define DIGIT (4*0) 57 #define END (4*1) 58 #define DELIM (4*2) 59 #define LETTER (4*3) 60 61 void 62 link_addr(addr, sdl) 63 register const char *addr; 64 register struct sockaddr_dl *sdl; 65 { 66 register char *cp = sdl->sdl_data; 67 char *cplim = sdl->sdl_len + (char *)sdl; 68 register int byte = 0, state = NAMING; 69 register int newaddr = 0; /* pacify gcc */ 70 71 bzero((char *)&sdl->sdl_family, sdl->sdl_len - 1); 72 sdl->sdl_family = AF_LINK; 73 do { 74 state &= ~LETTER; 75 if ((*addr >= '0') && (*addr <= '9')) { 76 newaddr = *addr - '0'; 77 } else if ((*addr >= 'a') && (*addr <= 'f')) { 78 newaddr = *addr - 'a' + 10; 79 } else if ((*addr >= 'A') && (*addr <= 'F')) { 80 newaddr = *addr - 'A' + 10; 81 } else if (*addr == 0) { 82 state |= END; 83 } else if (state == NAMING && 84 (((*addr >= 'A') && (*addr <= 'Z')) || 85 ((*addr >= 'a') && (*addr <= 'z')))) 86 state |= LETTER; 87 else 88 state |= DELIM; 89 addr++; 90 switch (state /* | INPUT */) { 91 case NAMING | DIGIT: 92 case NAMING | LETTER: 93 *cp++ = addr[-1]; 94 continue; 95 case NAMING | DELIM: 96 state = RESET; 97 sdl->sdl_nlen = cp - sdl->sdl_data; 98 continue; 99 case GOTTWO | DIGIT: 100 *cp++ = byte; 101 /* FALLTHROUGH */ 102 case RESET | DIGIT: 103 state = GOTONE; 104 byte = newaddr; 105 continue; 106 case GOTONE | DIGIT: 107 state = GOTTWO; 108 byte = newaddr + (byte << 4); 109 continue; 110 default: /* | DELIM */ 111 state = RESET; 112 *cp++ = byte; 113 byte = 0; 114 continue; 115 case GOTONE | END: 116 case GOTTWO | END: 117 *cp++ = byte; 118 /* FALLTHROUGH */ 119 case RESET | END: 120 break; 121 } 122 break; 123 } while (cp < cplim); 124 sdl->sdl_alen = cp - LLADDR(sdl); 125 newaddr = cp - (char *)sdl; 126 if (newaddr > sizeof(*sdl)) 127 sdl->sdl_len = newaddr; 128 return; 129 } 130 131 static char hexlist[] = "0123456789abcdef"; 132 133 char * 134 link_ntoa(sdl) 135 register const struct sockaddr_dl *sdl; 136 { 137 static char obuf[64]; 138 register char *out = obuf; 139 register int i; 140 register u_char *in = (u_char *)LLADDR(sdl); 141 u_char *inlim = in + sdl->sdl_alen; 142 int firsttime = 1; 143 144 if (sdl->sdl_nlen) { 145 bcopy(sdl->sdl_data, obuf, sdl->sdl_nlen); 146 out += sdl->sdl_nlen; 147 if (sdl->sdl_alen) 148 *out++ = ':'; 149 } 150 while (in < inlim) { 151 if (firsttime) 152 firsttime = 0; 153 else 154 *out++ = '.'; 155 i = *in++; 156 if (i > 0xf) { 157 out[1] = hexlist[i & 0xf]; 158 i >>= 4; 159 out[0] = hexlist[i]; 160 out += 2; 161 } else 162 *out++ = hexlist[i]; 163 } 164 *out = 0; 165 return (obuf); 166 } 167