net/FreeBSD/linkaddr.c

   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. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by the University of
  16  *      California, Berkeley and its contributors.
  17  * 4. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  */
  33
  34 #if defined(LIBC_SCCS) && !defined(lint)
  35 static char sccsid[] = "@(#)linkaddr.c  8.1 (Berkeley) 6/4/93";
  36 #endif /* LIBC_SCCS and not lint */
  37 #include <sys/cdefs.h>
  38 __FBSDID("$FreeBSD: src/lib/libc/net/linkaddr.c,v 1.3 2002/03/21 18:49:23 obrien Exp $");
  39
  40 #include <sys/types.h>
  41 #include <sys/socket.h>
  42 #include <net/if_dl.h>
  43 #include <string.h>
  44
  45 /* States*/
  46 #define NAMING  0
  47 #define GOTONE  1
  48 #define GOTTWO  2
  49 #define RESET   3
  50 /* Inputs */
  51 #define DIGIT   (4*0)
  52 #define END     (4*1)
  53 #define DELIM   (4*2)
  54 #define LETTER  (4*3)
  55
  56 void
  57 link_addr(addr, sdl)
  58         const char *addr;
  59         struct sockaddr_dl *sdl;
  60 {
  61         char *cp = sdl->sdl_data;
  62         char *cplim = sdl->sdl_len + (char *)sdl;
  63         int byte = 0, state = NAMING, new;
  64
  65         bzero((char *)&sdl->sdl_family, sdl->sdl_len - 1);
  66         sdl->sdl_family = AF_LINK;
  67         do {
  68                 state &= ~LETTER;
  69                 if ((*addr >= '0') && (*addr <= '9')) {
  70                         new = *addr - '0';
  71                 } else if ((*addr >= 'a') && (*addr <= 'f')) {
  72                         new = *addr - 'a' + 10;
  73                 } else if ((*addr >= 'A') && (*addr <= 'F')) {
  74                         new = *addr - 'A' + 10;
  75                 } else if (*addr == 0) {
  76                         state |= END;
  77                 } else if (state == NAMING &&
  78                            (((*addr >= 'A') && (*addr <= 'Z')) ||
  79                            ((*addr >= 'a') && (*addr <= 'z'))))
  80                         state |= LETTER;
  81                 else
  82                         state |= DELIM;
  83                 addr++;
  84                 switch (state /* | INPUT */) {
  85                 case NAMING | DIGIT:
  86                 case NAMING | LETTER:
  87                         *cp++ = addr[-1];
  88                         continue;
  89                 case NAMING | DELIM:
  90                         state = RESET;
  91                         sdl->sdl_nlen = cp - sdl->sdl_data;
  92                         continue;
  93                 case GOTTWO | DIGIT:
  94                         *cp++ = byte;
  95                         /* FALLTHROUGH */
  96                 case RESET | DIGIT:
  97                         state = GOTONE;
  98                         byte = new;
  99                         continue;
 100                 case GOTONE | DIGIT:
 101                         state = GOTTWO;
 102                         byte = new + (byte << 4);
 103                         continue;
 104                 default: /* | DELIM */
 105                         state = RESET;
 106                         *cp++ = byte;
 107                         byte = 0;
 108                         continue;
 109                 case GOTONE | END:
 110                 case GOTTWO | END:
 111                         *cp++ = byte;
 112                         /* FALLTHROUGH */
 113                 case RESET | END:
 114                         break;
 115                 }
 116                 break;
 117         } while (cp < cplim);
 118         sdl->sdl_alen = cp - LLADDR(sdl);
 119         new = cp - (char *)sdl;
 120         if (new > sizeof(*sdl))
 121                 sdl->sdl_len = new;
 122         return;
 123 }
 124
 125 static char hexlist[] = "0123456789abcdef";
 126
 127 char *
 128 link_ntoa(sdl)
 129         const struct sockaddr_dl *sdl;
 130 {
 131         static char obuf[64];
 132         char *out = obuf;
 133         int i;
 134         u_char *in = (u_char *)LLADDR(sdl);
 135         u_char *inlim = in + sdl->sdl_alen;
 136         int firsttime = 1;
 137
 138         if (sdl->sdl_nlen) {
 139                 bcopy(sdl->sdl_data, obuf, sdl->sdl_nlen);
 140                 out += sdl->sdl_nlen;
 141                 if (sdl->sdl_alen)
 142                         *out++ = ':';
 143         }
 144         while (in < inlim) {
 145                 if (firsttime)
 146                         firsttime = 0;
 147                 else
 148                         *out++ = '.';
 149                 i = *in++;
 150                 if (i > 0xf) {
 151                         out[1] = hexlist[i & 0xf];
 152                         i >>= 4;
 153                         out[0] = hexlist[i];
 154                         out += 2;
 155                 } else
 156                         *out++ = hexlist[i];
 157         }
 158         *out = 0;
 159         return (obuf);
 160 }