resolv/nsap_addr.c

   1 /*
   2  * Copyright (c) 1996 by Internet Software Consortium.
   3  *
   4  * Permission to use, copy, modify, and distribute this software for any
   5  * purpose with or without fee is hereby granted, provided that the above
   6  * copyright notice and this permission notice appear in all copies.
   7  *
   8  * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
   9  * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
  10  * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
  11  * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
  12  * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
  13  * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
  14  * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
  15  * SOFTWARE.
  16  */
  17
  18 #if defined(LIBC_SCCS) && !defined(lint)
  19 static char rcsid[] = "$Id$";
  20 #endif /* LIBC_SCCS and not lint */
  21
  22 #include <sys/types.h>
  23 #include <sys/param.h>
  24 #include <sys/socket.h>
  25 #include <netinet/in.h>
  26 #include <arpa/inet.h>
  27 #include <arpa/nameser.h>
  28 #include <ctype.h>
  29 #include <resolv.h>
  30
  31 #include "../conf/portability.h"
  32
  33 #if !defined(isxdigit)  /* XXX - could be a function */
  34 static int
  35 isxdigit(c)
  36         register int c;
  37 {
  38         return ((c >= '0') && (c <= '9')) || ((c >= 'A') && (c <= 'F'));
  39 }
  40 #endif
  41
  42 static char
  43 xtob(c)
  44         register int c;
  45 {
  46         return (c - (((c >= '0') && (c <= '9')) ? '0' : '7'));
  47 }
  48
  49 u_int
  50 inet_nsap_addr(ascii, binary, maxlen)
  51         const char *ascii;
  52         u_char *binary;
  53         int maxlen;
  54 {
  55         register u_char c, nib;
  56         u_int len = 0;
  57
  58         while ((c = *ascii++) != '\0' && (int) len < maxlen) {
  59                 if (c == '.' || c == '+' || c == '/')
  60                         continue;
  61                 if (!isascii(c))
  62                         return (0);
  63                 if (islower(c))
  64                         c = toupper(c);
  65                 if (isxdigit(c)) {
  66                         nib = xtob(c);
  67                         if ((c = *ascii++)) {
  68                                 c = toupper(c);
  69                                 if (isxdigit(c)) {
  70                                         *binary++ = (nib << 4) | xtob(c);
  71                                         len++;
  72                                 } else
  73                                         return (0);
  74                         }
  75                         else
  76                                 return (0);
  77                 }
  78                 else
  79                         return (0);
  80         }
  81         return (len);
  82 }
  83
  84 char *
  85 inet_nsap_ntoa(binlen, binary, ascii)
  86         int binlen;
  87         register const u_char *binary;
  88         register char *ascii;
  89 {
  90         register int nib;
  91         int i;
  92         static char tmpbuf[255*3];
  93         char *start;
  94
  95         if (ascii)
  96                 start = ascii;
  97         else {
  98                 ascii = tmpbuf;
  99                 start = tmpbuf;
 100         }
 101
 102         if (binlen > 255)
 103                 binlen = 255;
 104
 105         for (i = 0; i < binlen; i++) {
 106                 nib = *binary >> 4;
 107                 *ascii++ = nib + (nib < 10 ? '0' : '7');
 108                 nib = *binary++ & 0x0f;
 109                 *ascii++ = nib + (nib < 10 ? '0' : '7');
 110                 if (((i % 2) == 0 && (i + 1) < binlen))
 111                         *ascii++ = '.';
 112         }
 113         *ascii = '\0';
 114         return (start);
 115 }