lib/libc/net/nsap_addr.c

   1 /*
   2  * Copyright (c) 1996, 1998 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  * $FreeBSD: src/lib/libc/net/nsap_addr.c,v 1.7 1999/08/28 00:00:15 peter Exp $
  18  * $DragonFly: src/lib/libc/net/nsap_addr.c,v 1.4 2005/11/13 02:04:47 swildner Exp $
  19  */
  20
  21 #include <sys/types.h>
  22 #include <sys/param.h>
  23 #include <sys/socket.h>
  24 #include <netinet/in.h>
  25 #include <arpa/inet.h>
  26 #include <arpa/nameser.h>
  27 #include <ctype.h>
  28 #include <resolv.h>
  29
  30 static char
  31 xtob(int c)
  32 {
  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 {
  39         u_char c, nib;
  40         u_int len = 0;
  41
  42         while ((c = *ascii++) != '\0' && len < (u_int)maxlen) {
  43                 if (c == '.' || c == '+' || c == '/')
  44                         continue;
  45                 if (!isascii(c))
  46                         return (0);
  47                 if (islower(c))
  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 {
  72         int nib;
  73         int i;
  74         static char tmpbuf[255*3];
  75         char *start;
  76
  77         if (ascii)
  78                 start = ascii;
  79         else {
  80                 ascii = tmpbuf;
  81                 start = tmpbuf;
  82         }
  83
  84         if (binlen > 255)
  85                 binlen = 255;
  86
  87         for (i = 0; i < binlen; i++) {
  88                 nib = *binary >> 4;
  89                 *ascii++ = nib + (nib < 10 ? '0' : '7');
  90                 nib = *binary++ & 0x0f;
  91                 *ascii++ = nib + (nib < 10 ? '0' : '7');
  92                 if (((i % 2) == 0 && (i + 1) < binlen))
  93                         *ascii++ = '.';
  94         }
  95         *ascii = '\0';
  96         return (start);
  97 }
  98
  99 /*
 100  * Weak aliases for applications that use certain private entry points,
 101  * and fail to include <arpa/inet.h>.
 102  */
 103 #undef inet_nsap_addr
 104 __weak_reference(__inet_nsap_addr, inet_nsap_addr);
 105 #undef inet_nsap_ntoa
 106 __weak_reference(__inet_nsap_ntoa, inet_nsap_ntoa);