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