net.subproj/linkaddr.c

   1 /*
   2  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * The contents of this file constitute Original Code as defined in and
   7  * are subject to the Apple Public Source License Version 1.1 (the
   8  * "License").  You may not use this file except in compliance with the
   9  * License.  Please obtain a copy of the License at
  10  * http://www.apple.com/publicsource and read it before using this file.
  11  *
  12  * This Original Code and all software distributed under the License are
  13  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  14  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  15  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
  17  * License for the specific language governing rights and limitations
  18  * under the License.
  19  *
  20  * @APPLE_LICENSE_HEADER_END@
  21  */
  22 /*
  23  * Copyright (c) 1990, 1993
  24  *      The Regents of the University of California.  All rights reserved.
  25  *
  26  * Redistribution and use in source and binary forms, with or without
  27  * modification, are permitted provided that the following conditions
  28  * are met:
  29  * 1. Redistributions of source code must retain the above copyright
  30  *    notice, this list of conditions and the following disclaimer.
  31  * 2. Redistributions in binary form must reproduce the above copyright
  32  *    notice, this list of conditions and the following disclaimer in the
  33  *    documentation and/or other materials provided with the distribution.
  34  * 3. All advertising materials mentioning features or use of this software
  35  *    must display the following acknowledgement:
  36  *      This product includes software developed by the University of
  37  *      California, Berkeley and its contributors.
  38  * 4. Neither the name of the University nor the names of its contributors
  39  *    may be used to endorse or promote products derived from this software
  40  *    without specific prior written permission.
  41  *
  42  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  43  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  44  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  45  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  46  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  47  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  48  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  49  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  50  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  51  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  52  * SUCH DAMAGE.
  53  */
  54
  55
  56 #include <sys/types.h>
  57 #include <sys/socket.h>
  58 #include <net/if_dl.h>
  59 #include <string.h>
  60
  61 /* States*/
  62 #define NAMING  0
  63 #define GOTONE  1
  64 #define GOTTWO  2
  65 #define RESET   3
  66 /* Inputs */
  67 #define DIGIT   (4*0)
  68 #define END     (4*1)
  69 #define DELIM   (4*2)
  70 #define LETTER  (4*3)
  71
  72 void
  73 link_addr(addr, sdl)
  74         register const char *addr;
  75         register struct sockaddr_dl *sdl;
  76 {
  77         register char *cp = sdl->sdl_data;
  78         char *cplim = sdl->sdl_len + (char *)sdl;
  79         register int byte = 0, state = NAMING, new;
  80
  81         bzero((char *)&sdl->sdl_family, sdl->sdl_len - 1);
  82         sdl->sdl_family = AF_LINK;
  83         do {
  84                 state &= ~LETTER;
  85                 if ((*addr >= '0') && (*addr <= '9')) {
  86                         new = *addr - '0';
  87                 } else if ((*addr >= 'a') && (*addr <= 'f')) {
  88                         new = *addr - 'a' + 10;
  89                 } else if ((*addr >= 'A') && (*addr <= 'F')) {
  90                         new = *addr - 'A' + 10;
  91                 } else if (*addr == 0) {
  92                         state |= END;
  93                 } else if (state == NAMING &&
  94                            (((*addr >= 'A') && (*addr <= 'Z')) ||
  95                            ((*addr >= 'a') && (*addr <= 'z'))))
  96                         state |= LETTER;
  97                 else
  98                         state |= DELIM;
  99                 addr++;
 100                 switch (state /* | INPUT */) {
 101                 case NAMING | DIGIT:
 102                 case NAMING | LETTER:
 103                         *cp++ = addr[-1];
 104                         continue;
 105                 case NAMING | DELIM:
 106                         state = RESET;
 107                         sdl->sdl_nlen = cp - sdl->sdl_data;
 108                         continue;
 109                 case GOTTWO | DIGIT:
 110                         *cp++ = byte;
 111                         /* FALLTHROUGH */
 112                 case RESET | DIGIT:
 113                         state = GOTONE;
 114                         byte = new;
 115                         continue;
 116                 case GOTONE | DIGIT:
 117                         state = GOTTWO;
 118                         byte = new + (byte << 4);
 119                         continue;
 120                 default: /* | DELIM */
 121                         state = RESET;
 122                         *cp++ = byte;
 123                         byte = 0;
 124                         continue;
 125                 case GOTONE | END:
 126                 case GOTTWO | END:
 127                         *cp++ = byte;
 128                         /* FALLTHROUGH */
 129                 case RESET | END:
 130                         break;
 131                 }
 132                 break;
 133         } while (cp < cplim);
 134         sdl->sdl_alen = cp - LLADDR(sdl);
 135         new = cp - (char *)sdl;
 136         if (new > sizeof(*sdl))
 137                 sdl->sdl_len = new;
 138         return;
 139 }
 140
 141 static char hexlist[] = "0123456789abcdef";
 142
 143 char *
 144 link_ntoa(sdl)
 145         register const struct sockaddr_dl *sdl;
 146 {
 147         static char obuf[64];
 148         register char *out = obuf;
 149         register int i;
 150         register u_char *in = (u_char *)LLADDR(sdl);
 151         u_char *inlim = in + sdl->sdl_alen;
 152         int firsttime = 1;
 153
 154         if (sdl->sdl_nlen) {
 155                 bcopy(sdl->sdl_data, obuf, sdl->sdl_nlen);
 156                 out += sdl->sdl_nlen;
 157                 if (sdl->sdl_alen)
 158                         *out++ = ':';
 159         }
 160         while (in < inlim) {
 161                 if (firsttime)
 162                         firsttime = 0;
 163                 else
 164                         *out++ = '.';
 165                 i = *in++;
 166                 if (i > 0xf) {
 167                         out[1] = hexlist[i & 0xf];
 168                         i >>= 4;
 169                         out[0] = hexlist[i];
 170                         out += 2;
 171                 } else
 172                         *out++ = hexlist[i];
 173         }
 174         *out = 0;
 175         return (obuf);
 176 }