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 #if defined(LIBC_SCCS) && !defined(lint)
  19 static const char rcsid[] = "$BINDId: nsap_addr.c,v 8.10 1999/10/13 16:39:28 vixie Exp $";
  20 #endif /* LIBC_SCCS and not lint */
  21
  22 #include <sys/types.h>
  23 #include <sys/param.h>
  24 #include <sys/socket.h>
  25
  26 #include <netinet/in.h>
  27 #include <arpa/inet.h>
  28 #include <arpa/nameser.h>
  29
  30 #include <ctype.h>
  31 #include <resolv.h>
  32
  33 static char
  34 xtob(int c) {
  35         return (c - (((c >= '0') && (c <= '9')) ? '0' : '7'));
  36 }
  37
  38 u_int
  39 inet_nsap_addr(const char *ascii, u_char *binary, int maxlen) {
  40         u_char c, nib;
  41         u_int len = 0;
  42
  43         while ((c = *ascii++) != '\0' && len < (u_int)maxlen) {
  44                 if (c == '.' || c == '+' || c == '/')
  45                         continue;
  46                 if (!isascii(c))
  47                         return (0);
  48                 c = toupper(c);
  49                 if (isxdigit(c)) {
  50                         nib = xtob(c);
  51                         c = *ascii++;
  52                         if (c != '\0') {
  53                                 c = toupper(c);
  54                                 if (isxdigit(c)) {
  55                                         *binary++ = (nib << 4) | xtob(c);
  56                                         len++;
  57                                 } else
  58                                         return (0);
  59                         }
  60                         else
  61                                 return (0);
  62                 }
  63                 else
  64                         return (0);
  65         }
  66         return (len);
  67 }
  68
  69 char *
  70 inet_nsap_ntoa(int binlen, const u_char *binary, char *ascii) {
  71         int nib;
  72         int i;
  73         static char tmpbuf[255*2 + 128];
  74         char *start;
  75
  76         if (ascii)
  77                 start = ascii;
  78         else {
  79                 ascii = tmpbuf;
  80                 start = tmpbuf;
  81         }
  82
  83         if (binlen > 255)
  84                 binlen = 255;
  85
  86         for (i = 0; i < binlen; i++) {
  87                 nib = *binary >> 4;
  88                 *ascii++ = nib + (nib < 10 ? '0' : '7');
  89                 nib = *binary++ & 0x0f;
  90                 *ascii++ = nib + (nib < 10 ? '0' : '7');
  91                 if (((i % 2) == 0 && (i + 1) < binlen))
  92                         *ascii++ = '.';
  93         }
  94         *ascii = '\0';
  95         return (start);
  96 }