lib/libc/net/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. 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  * @(#)linkaddr.c       8.1 (Berkeley) 6/4/93
  30  * $DragonFly: src/lib/libc/net/linkaddr.c,v 1.5 2005/11/13 02:04:47 swildner Exp $
  31  */
  32
  33 #include <sys/types.h>
  34 #include <sys/socket.h>
  35 #include <net/if_dl.h>
  36 #include <string.h>
  37
  38 /* States*/
  39 #define NAMING  0
  40 #define GOTONE  1
  41 #define GOTTWO  2
  42 #define RESET   3
  43 /* Inputs */
  44 #define DIGIT   (4*0)
  45 #define END     (4*1)
  46 #define DELIM   (4*2)
  47 #define LETTER  (4*3)
  48
  49 void
  50 link_addr(const char *addr, struct sockaddr_dl *sdl)
  51 {
  52         char *cp = sdl->sdl_data;
  53         char *cplim = sdl->sdl_len + (char *)sdl;
  54         int byte = 0, state = NAMING, new;
  55
  56         bzero((char *)&sdl->sdl_family, sdl->sdl_len - 1);
  57         sdl->sdl_family = AF_LINK;
  58         do {
  59                 state &= ~LETTER;
  60                 if ((*addr >= '0') && (*addr <= '9')) {
  61                         new = *addr - '0';
  62                 } else if ((*addr >= 'a') && (*addr <= 'f')) {
  63                         new = *addr - 'a' + 10;
  64                 } else if ((*addr >= 'A') && (*addr <= 'F')) {
  65                         new = *addr - 'A' + 10;
  66                 } else if (*addr == 0) {
  67                         state |= END;
  68                 } else if (state == NAMING &&
  69                            (((*addr >= 'A') && (*addr <= 'Z')) ||
  70                            ((*addr >= 'a') && (*addr <= 'z'))))
  71                         state |= LETTER;
  72                 else
  73                         state |= DELIM;
  74                 addr++;
  75                 switch (state /* | INPUT */) {
  76                 case NAMING | DIGIT:
  77                 case NAMING | LETTER:
  78                         *cp++ = addr[-1];
  79                         continue;
  80                 case NAMING | DELIM:
  81                         state = RESET;
  82                         sdl->sdl_nlen = cp - sdl->sdl_data;
  83                         continue;
  84                 case GOTTWO | DIGIT:
  85                         *cp++ = byte;
  86                         /* FALLTHROUGH */
  87                 case RESET | DIGIT:
  88                         state = GOTONE;
  89                         byte = new;
  90                         continue;
  91                 case GOTONE | DIGIT:
  92                         state = GOTTWO;
  93                         byte = new + (byte << 4);
  94                         continue;
  95                 default: /* | DELIM */
  96                         state = RESET;
  97                         *cp++ = byte;
  98                         byte = 0;
  99                         continue;
 100                 case GOTONE | END:
 101                 case GOTTWO | END:
 102                         *cp++ = byte;
 103                         /* FALLTHROUGH */
 104                 case RESET | END:
 105                         break;
 106                 }
 107                 break;
 108         } while (cp < cplim);
 109         sdl->sdl_alen = cp - LLADDR(sdl);
 110         new = cp - (char *)sdl;
 111         if (new > sizeof(*sdl))
 112                 sdl->sdl_len = new;
 113         return;
 114 }
 115
 116 static char hexlist[] = "0123456789abcdef";
 117
 118 char *
 119 link_ntoa(const struct sockaddr_dl *sdl)
 120 {
 121         static char obuf[64];
 122         char *out = obuf;
 123         int i;
 124         u_char *in = (u_char *)LLADDR(sdl);
 125         u_char *inlim = in + sdl->sdl_alen;
 126         int firsttime = 1;
 127
 128         if (sdl->sdl_nlen) {
 129                 bcopy(sdl->sdl_data, obuf, sdl->sdl_nlen);
 130                 out += sdl->sdl_nlen;
 131                 if (sdl->sdl_alen)
 132                         *out++ = ':';
 133         }
 134         while (in < inlim) {
 135                 if (firsttime)
 136                         firsttime = 0;
 137                 else
 138                         *out++ = '.';
 139                 i = *in++;
 140                 if (i > 0xf) {
 141                         out[1] = hexlist[i & 0xf];
 142                         i >>= 4;
 143                         out[0] = hexlist[i];
 144                         out += 2;
 145                 } else
 146                         *out++ = hexlist[i];
 147         }
 148         *out = 0;
 149         return (obuf);
 150 }