resolv/nsap_addr.c

   1 /*
   2  * Copyright (c) 1996-1999 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 #include <sys/types.h>
  19 #include <sys/param.h>
  20 #include <sys/socket.h>
  21
  22 #include <netinet/in.h>
  23 #include <arpa/inet.h>
  24 #include <arpa/nameser.h>
  25
  26 #include <ctype.h>
  27 #include <resolv.h>
  28
  29 static char
  30 xtob(int c) {
  31         return (c - (((c >= '0') && (c <= '9')) ? '0' : '7'));
  32 }
  33
  34 u_int
  35 inet_nsap_addr(const char *ascii, u_char *binary, int maxlen) {
  36         u_char c, nib;
  37         u_int len = 0;
  38
  39         while ((c = *ascii++) != '\0' && len < (u_int)maxlen) {
  40                 if (c == '.' || c == '+' || c == '/')
  41                         continue;
  42                 if (!isascii(c))
  43                         return (0);
  44                 c = toupper(c);
  45                 if (isxdigit(c)) {
  46                         nib = xtob(c);
  47                         c = *ascii++;
  48                         if (c != '\0') {
  49                                 c = toupper(c);
  50                                 if (isxdigit(c)) {
  51                                         *binary++ = (nib << 4) | xtob(c);
  52                                         len++;
  53                                 } else
  54                                         return (0);
  55                         }
  56                         else
  57                                 return (0);
  58                 }
  59                 else
  60                         return (0);
  61         }
  62         return (len);
  63 }
  64
  65 char *
  66 inet_nsap_ntoa(int binlen, const u_char *binary, char *ascii) {
  67         int nib;
  68         int i;
  69         static char tmpbuf[255*2 + 128];
  70         char *start;
  71
  72         if (ascii)
  73                 start = ascii;
  74         else {
  75                 ascii = tmpbuf;
  76                 start = tmpbuf;
  77         }
  78
  79         if (binlen > 255)
  80                 binlen = 255;
  81
  82         for (i = 0; i < binlen; i++) {
  83                 nib = *binary >> 4;
  84                 *ascii++ = nib + (nib < 10 ? '0' : '7');
  85                 nib = *binary++ & 0x0f;
  86                 *ascii++ = nib + (nib < 10 ? '0' : '7');
  87                 if (((i % 2) == 0 && (i + 1) < binlen))
  88                         *ascii++ = '.';
  89         }
  90         *ascii = '\0';
  91         return (start);
  92 }