1 /*- 2 * Copyright (c) 1990, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * %sccs.include.redist.c% 6 */ 7 8 #if defined(LIBC_SCCS) && !defined(lint) 9 static char sccsid[] = "@(#)linkaddr.c 8.1 (Berkeley) 06/04/93"; 10 #endif /* LIBC_SCCS and not lint */ 11 12 #include <sys/types.h> 13 #include <sys/socket.h> 14 #include <net/if_dl.h> 15 #include <string.h> 16 17 /* States*/ 18 #define NAMING 0 19 #define GOTONE 1 20 #define GOTTWO 2 21 #define RESET 3 22 /* Inputs */ 23 #define DIGIT (4*0) 24 #define END (4*1) 25 #define DELIM (4*2) 26 #define LETTER (4*3) 27 28 void 29 link_addr(addr, sdl) 30 register const char *addr; 31 register struct sockaddr_dl *sdl; 32 { 33 register char *cp = sdl->sdl_data; 34 char *cplim = sdl->sdl_len + (char *)sdl; 35 register int byte = 0, state = NAMING, new; 36 37 bzero((char *)&sdl->sdl_family, sdl->sdl_len - 1); 38 sdl->sdl_family = AF_LINK; 39 do { 40 state &= ~LETTER; 41 if ((*addr >= '0') && (*addr <= '9')) { 42 new = *addr - '0'; 43 } else if ((*addr >= 'a') && (*addr <= 'f')) { 44 new = *addr - 'a' + 10; 45 } else if ((*addr >= 'A') && (*addr <= 'F')) { 46 new = *addr - 'A' + 10; 47 } else if (*addr == 0) { 48 state |= END; 49 } else if (state == NAMING && 50 (((*addr >= 'A') && (*addr <= 'Z')) || 51 ((*addr >= 'a') && (*addr <= 'z')))) 52 state |= LETTER; 53 else 54 state |= DELIM; 55 addr++; 56 switch (state /* | INPUT */) { 57 case NAMING | DIGIT: 58 case NAMING | LETTER: 59 *cp++ = addr[-1]; 60 continue; 61 case NAMING | DELIM: 62 state = RESET; 63 sdl->sdl_nlen = cp - sdl->sdl_data; 64 continue; 65 case GOTTWO | DIGIT: 66 *cp++ = byte; 67 /* FALLTHROUGH */ 68 case RESET | DIGIT: 69 state = GOTONE; 70 byte = new; 71 continue; 72 case GOTONE | DIGIT: 73 state = GOTTWO; 74 byte = new + (byte << 4); 75 continue; 76 default: /* | DELIM */ 77 state = RESET; 78 *cp++ = byte; 79 byte = 0; 80 continue; 81 case GOTONE | END: 82 case GOTTWO | END: 83 *cp++ = byte; 84 /* FALLTHROUGH */ 85 case RESET | END: 86 break; 87 } 88 break; 89 } while (cp < cplim); 90 sdl->sdl_alen = cp - LLADDR(sdl); 91 new = cp - (char *)sdl; 92 if (new > sizeof(*sdl)) 93 sdl->sdl_len = new; 94 return; 95 } 96 97 static char hexlist[] = "0123456789abcdef"; 98 99 char * 100 link_ntoa(sdl) 101 register const struct sockaddr_dl *sdl; 102 { 103 static char obuf[64]; 104 register char *out = obuf; 105 register int i; 106 register u_char *in = (u_char *)LLADDR(sdl); 107 u_char *inlim = in + sdl->sdl_alen; 108 int firsttime = 1; 109 110 if (sdl->sdl_nlen) { 111 bcopy(sdl->sdl_data, obuf, sdl->sdl_nlen); 112 out += sdl->sdl_nlen; 113 if (sdl->sdl_alen) 114 *out++ = ':'; 115 } 116 while (in < inlim) { 117 if (firsttime) 118 firsttime = 0; 119 else 120 *out++ = '.'; 121 i = *in++; 122 if (i > 0xf) { 123 out[1] = hexlist[i & 0xf]; 124 i >>= 4; 125 out[0] = hexlist[i]; 126 out += 2; 127 } else 128 *out++ = hexlist[i]; 129 } 130 *out = 0; 131 return (obuf); 132 } 133