net/linkaddr.c

   1 /*
   2  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
   7  *
   8  * This file contains Original Code and/or Modifications of Original Code
   9  * as defined in and that are subject to the Apple Public Source License
  10  * Version 2.0 (the 'License'). You may not use this file except in
  11  * compliance with the License. Please obtain a copy of the License at
  12  * http://www.opensource.apple.com/apsl/ and read it before using this
  13  * file.
  14  *
  15  * The Original Code and all software distributed under the License are
  16  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  17  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  18  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  20  * Please see the License for the specific language governing rights and
  21  * limitations under the License.
  22  *
  23  * @APPLE_LICENSE_HEADER_END@
  24  */
  25 /*
  26  * Copyright (c) 1990, 1993
  27  *      The Regents of the University of California.  All rights reserved.
  28  *
  29  * Redistribution and use in source and binary forms, with or without
  30  * modification, are permitted provided that the following conditions
  31  * are met:
  32  * 1. Redistributions of source code must retain the above copyright
  33  *    notice, this list of conditions and the following disclaimer.
  34  * 2. Redistributions in binary form must reproduce the above copyright
  35  *    notice, this list of conditions and the following disclaimer in the
  36  *    documentation and/or other materials provided with the distribution.
  37  * 3. All advertising materials mentioning features or use of this software
  38  *    must display the following acknowledgement:
  39  *      This product includes software developed by the University of
  40  *      California, Berkeley and its contributors.
  41  * 4. Neither the name of the University nor the names of its contributors
  42  *    may be used to endorse or promote products derived from this software
  43  *    without specific prior written permission.
  44  *
  45  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  46  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  47  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  48  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  49  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  50  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  51  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  52  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  53  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  54  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  55  * SUCH DAMAGE.
  56  */
  57
  58
  59 #include <sys/types.h>
  60 #include <sys/socket.h>
  61 #include <net/if_dl.h>
  62 #include <string.h>
  63
  64 /* States*/
  65 #define NAMING  0
  66 #define GOTONE  1
  67 #define GOTTWO  2
  68 #define RESET   3
  69 /* Inputs */
  70 #define DIGIT   (4*0)
  71 #define END     (4*1)
  72 #define DELIM   (4*2)
  73 #define LETTER  (4*3)
  74
  75 void
  76 link_addr(addr, sdl)
  77         register const char *addr;
  78         register struct sockaddr_dl *sdl;
  79 {
  80         register char *cp = sdl->sdl_data;
  81         char *cplim = sdl->sdl_len + (char *)sdl;
  82         register int byte = 0, state = NAMING, new;
  83
  84         bzero((char *)&sdl->sdl_family, sdl->sdl_len - 1);
  85         sdl->sdl_family = AF_LINK;
  86         do {
  87                 state &= ~LETTER;
  88                 if ((*addr >= '0') && (*addr <= '9')) {
  89                         new = *addr - '0';
  90                 } else if ((*addr >= 'a') && (*addr <= 'f')) {
  91                         new = *addr - 'a' + 10;
  92                 } else if ((*addr >= 'A') && (*addr <= 'F')) {
  93                         new = *addr - 'A' + 10;
  94                 } else if (*addr == 0) {
  95                         state |= END;
  96                 } else if (state == NAMING &&
  97                            (((*addr >= 'A') && (*addr <= 'Z')) ||
  98                            ((*addr >= 'a') && (*addr <= 'z'))))
  99                         state |= LETTER;
 100                 else
 101                         state |= DELIM;
 102                 addr++;
 103                 switch (state /* | INPUT */) {
 104                 case NAMING | DIGIT:
 105                 case NAMING | LETTER:
 106                         *cp++ = addr[-1];
 107                         continue;
 108                 case NAMING | DELIM:
 109                         state = RESET;
 110                         sdl->sdl_nlen = cp - sdl->sdl_data;
 111                         continue;
 112                 case GOTTWO | DIGIT:
 113                         *cp++ = byte;
 114                         /* FALLTHROUGH */
 115                 case RESET | DIGIT:
 116                         state = GOTONE;
 117                         byte = new;
 118                         continue;
 119                 case GOTONE | DIGIT:
 120                         state = GOTTWO;
 121                         byte = new + (byte << 4);
 122                         continue;
 123                 default: /* | DELIM */
 124                         state = RESET;
 125                         *cp++ = byte;
 126                         byte = 0;
 127                         continue;
 128                 case GOTONE | END:
 129                 case GOTTWO | END:
 130                         *cp++ = byte;
 131                         /* FALLTHROUGH */
 132                 case RESET | END:
 133                         break;
 134                 }
 135                 break;
 136         } while (cp < cplim);
 137         sdl->sdl_alen = cp - LLADDR(sdl);
 138         new = cp - (char *)sdl;
 139         if (new > sizeof(*sdl))
 140                 sdl->sdl_len = new;
 141         return;
 142 }
 143
 144 static char hexlist[] = "0123456789abcdef";
 145
 146 char *
 147 link_ntoa(sdl)
 148         register const struct sockaddr_dl *sdl;
 149 {
 150         static char obuf[64];
 151         register char *out = obuf;
 152         register int i;
 153         register u_char *in = (u_char *)LLADDR(sdl);
 154         u_char *inlim = in + sdl->sdl_alen;
 155         int firsttime = 1;
 156
 157         if (sdl->sdl_nlen) {
 158                 bcopy(sdl->sdl_data, obuf, sdl->sdl_nlen);
 159                 out += sdl->sdl_nlen;
 160                 if (sdl->sdl_alen)
 161                         *out++ = ':';
 162         }
 163         while (in < inlim) {
 164                 if (firsttime)
 165                         firsttime = 0;
 166                 else
 167                         *out++ = '.';
 168                 i = *in++;
 169                 if (i > 0xf) {
 170                         out[1] = hexlist[i & 0xf];
 171                         i >>= 4;
 172                         out[0] = hexlist[i];
 173                         out += 2;
 174                 } else
 175                         *out++ = hexlist[i];
 176         }
 177         *out = 0;
 178         return (obuf);
 179 }