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 static char
  32 xtob(int c) {
  33         return (c - (((c >= '0') && (c <= '9')) ? '0' : '7'));
  34 }
  35
  36 u_int
  37 inet_nsap_addr(const char *ascii, u_char *binary, int maxlen) {
  38         u_char c, nib;
  39         u_int len = 0;
  40
  41         while ((c = *ascii++) != '\0' && (int) len < maxlen) {
  42                 if (c == '.' || c == '+' || c == '/')
  43                         continue;
  44                 if (!isascii(c))
  45                         return (0);
  46                 c = toupper(c);
  47                 if (isxdigit(c)) {
  48                         nib = xtob(c);
  49                         c = *ascii++;
  50                         if (c != '\0') {
  51                                 c = toupper(c);
  52                                 if (isxdigit(c)) {
  53                                         *binary++ = (nib << 4) | xtob(c);
  54                                         len++;
  55                                 } else
  56                                         return (0);
  57                         }
  58                         else
  59                                 return (0);
  60                 }
  61                 else
  62                         return (0);
  63         }
  64         return (len);
  65 }
  66
  67 char *
  68 inet_nsap_ntoa(int binlen, const u_char *binary, char *ascii) {
  69         int nib;
  70         int i;
  71         static char tmpbuf[255*3];
  72         char *start;
  73
  74         if (ascii)
  75                 start = ascii;
  76         else {
  77                 ascii = tmpbuf;
  78                 start = tmpbuf;
  79         }
  80
  81         if (binlen > 255)
  82                 binlen = 255;
  83
  84         for (i = 0; i < binlen; i++) {
  85                 nib = *binary >> 4;
  86                 *ascii++ = nib + (nib < 10 ? '0' : '7');
  87                 nib = *binary++ & 0x0f;
  88                 *ascii++ = nib + (nib < 10 ? '0' : '7');
  89                 if (((i % 2) == 0 && (i + 1) < binlen))
  90                         *ascii++ = '.';
  91         }
  92         *ascii = '\0';
  93         return (start);
  94 }