1 /* $NetBSD: linkaddr.c,v 1.5 1995/02/25 06:20:49 cgd 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 #if defined(LIBC_SCCS) && !defined(lint) 37 #if 0 38 static char sccsid[] = "@(#)linkaddr.c 8.1 (Berkeley) 6/4/93"; 39 #else 40 static char rcsid[] = "$NetBSD: linkaddr.c,v 1.5 1995/02/25 06:20:49 cgd Exp $"; 41 #endif 42 #endif /* LIBC_SCCS and not lint */ 43 44 #include <sys/types.h> 45 #include <sys/socket.h> 46 #include <net/if_dl.h> 47 #include <string.h> 48 49 /* States*/ 50 #define NAMING 0 51 #define GOTONE 1 52 #define GOTTWO 2 53 #define RESET 3 54 /* Inputs */ 55 #define DIGIT (4*0) 56 #define END (4*1) 57 #define DELIM (4*2) 58 #define LETTER (4*3) 59 60 void 61 link_addr(addr, sdl) 62 register const char *addr; 63 register struct sockaddr_dl *sdl; 64 { 65 register char *cp = sdl->sdl_data; 66 char *cplim = sdl->sdl_len + (char *)sdl; 67 register int byte = 0, state = NAMING, new; 68 69 bzero((char *)&sdl->sdl_family, sdl->sdl_len - 1); 70 sdl->sdl_family = AF_LINK; 71 do { 72 state &= ~LETTER; 73 if ((*addr >= '0') && (*addr <= '9')) { 74 new = *addr - '0'; 75 } else if ((*addr >= 'a') && (*addr <= 'f')) { 76 new = *addr - 'a' + 10; 77 } else if ((*addr >= 'A') && (*addr <= 'F')) { 78 new = *addr - 'A' + 10; 79 } else if (*addr == 0) { 80 state |= END; 81 } else if (state == NAMING && 82 (((*addr >= 'A') && (*addr <= 'Z')) || 83 ((*addr >= 'a') && (*addr <= 'z')))) 84 state |= LETTER; 85 else 86 state |= DELIM; 87 addr++; 88 switch (state /* | INPUT */) { 89 case NAMING | DIGIT: 90 case NAMING | LETTER: 91 *cp++ = addr[-1]; 92 continue; 93 case NAMING | DELIM: 94 state = RESET; 95 sdl->sdl_nlen = cp - sdl->sdl_data; 96 continue; 97 case GOTTWO | DIGIT: 98 *cp++ = byte; 99 /* FALLTHROUGH */ 100 case RESET | DIGIT: 101 state = GOTONE; 102 byte = new; 103 continue; 104 case GOTONE | DIGIT: 105 state = GOTTWO; 106 byte = new + (byte << 4); 107 continue; 108 default: /* | DELIM */ 109 state = RESET; 110 *cp++ = byte; 111 byte = 0; 112 continue; 113 case GOTONE | END: 114 case GOTTWO | END: 115 *cp++ = byte; 116 /* FALLTHROUGH */ 117 case RESET | END: 118 break; 119 } 120 break; 121 } while (cp < cplim); 122 sdl->sdl_alen = cp - LLADDR(sdl); 123 new = cp - (char *)sdl; 124 if (new > sizeof(*sdl)) 125 sdl->sdl_len = new; 126 return; 127 } 128 129 static char hexlist[] = "0123456789abcdef"; 130 131 char * 132 link_ntoa(sdl) 133 register const struct sockaddr_dl *sdl; 134 { 135 static char obuf[64]; 136 register char *out = obuf; 137 register int i; 138 register u_char *in = (u_char *)LLADDR(sdl); 139 u_char *inlim = in + sdl->sdl_alen; 140 int firsttime = 1; 141 142 if (sdl->sdl_nlen) { 143 bcopy(sdl->sdl_data, obuf, sdl->sdl_nlen); 144 out += sdl->sdl_nlen; 145 if (sdl->sdl_alen) 146 *out++ = ':'; 147 } 148 while (in < inlim) { 149 if (firsttime) 150 firsttime = 0; 151 else 152 *out++ = '.'; 153 i = *in++; 154 if (i > 0xf) { 155 out[1] = hexlist[i & 0xf]; 156 i >>= 4; 157 out[0] = hexlist[i]; 158 out += 2; 159 } else 160 *out++ = hexlist[i]; 161 } 162 *out = 0; 163 return (obuf); 164 } 165