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