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. 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 #include <sys/cdefs.h> 31 #if defined(LIBC_SCCS) && !defined(lint) 32 static char sccsid[] = "@(#)linkaddr.c 8.1 (Berkeley) 6/4/93"; 33 #endif /* LIBC_SCCS and not lint */ 34 35 #include <sys/types.h> 36 #include <sys/socket.h> 37 #include <net/if_dl.h> 38 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 *)(void *)sdl; 59 int byte = 0, state = NAMING; 60 int newaddr = 0; 61 62 (void)memset(&sdl->sdl_family, 0, (size_t)sdl->sdl_len - 1); 63 sdl->sdl_family = AF_LINK; 64 do { 65 state &= ~LETTER; 66 if ((*addr >= '0') && (*addr <= '9')) { 67 newaddr = *addr - '0'; 68 } else if ((*addr >= 'a') && (*addr <= 'f')) { 69 newaddr = *addr - 'a' + 10; 70 } else if ((*addr >= 'A') && (*addr <= 'F')) { 71 newaddr = *addr - 'A' + 10; 72 } else if (*addr == 0) { 73 state |= END; 74 } else if (state == NAMING && 75 (((*addr >= 'A') && (*addr <= 'Z')) || 76 ((*addr >= 'a') && (*addr <= 'z')))) 77 state |= LETTER; 78 else 79 state |= DELIM; 80 addr++; 81 switch (state /* | INPUT */) { 82 case NAMING | DIGIT: 83 case NAMING | LETTER: 84 *cp++ = addr[-1]; 85 continue; 86 case NAMING | DELIM: 87 state = RESET; 88 sdl->sdl_nlen = cp - sdl->sdl_data; 89 continue; 90 case GOTTWO | DIGIT: 91 *cp++ = byte; 92 /* FALLTHROUGH */ 93 case RESET | DIGIT: 94 state = GOTONE; 95 byte = newaddr; 96 continue; 97 case GOTONE | DIGIT: 98 state = GOTTWO; 99 byte = newaddr + (byte << 4); 100 continue; 101 default: /* | DELIM */ 102 state = RESET; 103 *cp++ = byte; 104 byte = 0; 105 continue; 106 case GOTONE | END: 107 case GOTTWO | END: 108 *cp++ = byte; 109 /* FALLTHROUGH */ 110 case RESET | END: 111 break; 112 } 113 break; 114 } while (cp < cplim); 115 sdl->sdl_alen = cp - LLADDR(sdl); 116 newaddr = cp - (char *)(void *)sdl; 117 if ((size_t) newaddr > sizeof(*sdl)) 118 sdl->sdl_len = newaddr; 119 return; 120 } 121
