lib/libc/inet/nsap_addr.c

   1 /*      $NetBSD: nsap_addr.c,v 1.6 2009/04/12 17:07:17 christos Exp $   */
   2
   3 /*
   4  * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
   5  * Copyright (c) 1996-1999 by Internet Software Consortium.
   6  *
   7  * Permission to use, copy, modify, and distribute this software for any
   8  * purpose with or without fee is hereby granted, provided that the above
   9  * copyright notice and this permission notice appear in all copies.
  10  *
  11  * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
  12  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  13  * MERCHANTABILITY AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR
  14  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  15  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  16  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
  17  * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  18  */
  19
  20 #include <sys/cdefs.h>
  21 #if defined(LIBC_SCCS) && !defined(lint)
  22 #if 0
  23 static const char rcsid[] = "Id: nsap_addr.c,v 1.5 2005/07/28 06:51:48 marka Exp";
  24 #else
  25 __RCSID("$NetBSD: nsap_addr.c,v 1.6 2009/04/12 17:07:17 christos Exp $");
  26 #endif
  27 #endif /* LIBC_SCCS and not lint */
  28
  29 #include "port_before.h"
  30
  31 #include "namespace.h"
  32 #include <sys/types.h>
  33 #include <sys/param.h>
  34 #include <sys/socket.h>
  35
  36 #include <netinet/in.h>
  37 #include <arpa/inet.h>
  38 #include <arpa/nameser.h>
  39
  40 #include <assert.h>
  41 #include <ctype.h>
  42 #include <resolv.h>
  43 #include <resolv_mt.h>
  44
  45 #include "port_after.h"
  46
  47 #ifdef __weak_alias
  48 __weak_alias(inet_nsap_addr,_inet_nsap_addr)
  49 __weak_alias(inet_nsap_ntoa,_inet_nsap_ntoa)
  50 #endif
  51
  52 static char
  53 xtob(int c) {
  54         return (c - (((c >= '0') && (c <= '9')) ? '0' : '7'));
  55 }
  56
  57 u_int
  58 inet_nsap_addr(const char *ascii, u_char *binary, int maxlen) {
  59         u_char c, nib;
  60         u_int len = 0;
  61
  62         _DIAGASSERT(ascii != NULL);
  63         _DIAGASSERT(binary != NULL);
  64
  65         if (ascii[0] != '0' || (ascii[1] != 'x' && ascii[1] != 'X'))
  66                 return (0);
  67         ascii += 2;
  68
  69         while ((c = *ascii++) != '\0' && len < (u_int)maxlen) {
  70                 if (c == '.' || c == '+' || c == '/')
  71                         continue;
  72                 if (!isascii(c))
  73                         return (0);
  74                 if (islower(c))
  75                         c = toupper(c);
  76                 if (isxdigit(c)) {
  77                         nib = xtob(c);
  78                         c = *ascii++;
  79                         if (c != '\0') {
  80                                 c = toupper(c);
  81                                 if (isxdigit(c)) {
  82                                         *binary++ = (nib << 4) | xtob(c);
  83                                         len++;
  84                                 } else
  85                                         return (0);
  86                         }
  87                         else
  88                                 return (0);
  89                 }
  90                 else
  91                         return (0);
  92         }
  93         return (len);
  94 }
  95
  96 char *
  97 inet_nsap_ntoa(int binlen, const u_char *binary, char *ascii) {
  98         int nib;
  99         int i;
 100         char *tmpbuf = inet_nsap_ntoa_tmpbuf;
 101         char *start;
 102
 103         _DIAGASSERT(binary != NULL);
 104
 105         if (ascii)
 106                 start = ascii;
 107         else {
 108                 ascii = tmpbuf;
 109                 start = tmpbuf;
 110         }
 111
 112         *ascii++ = '0';
 113         *ascii++ = 'x';
 114
 115         if (binlen > 255)
 116                 binlen = 255;
 117
 118         for (i = 0; i < binlen; i++) {
 119                 nib = (u_int32_t)*binary >> 4;
 120                 *ascii++ = nib + (nib < 10 ? '0' : '7');
 121                 nib = *binary++ & 0x0f;
 122                 *ascii++ = nib + (nib < 10 ? '0' : '7');
 123                 if (((i % 2) == 0 && (i + 1) < binlen))
 124                         *ascii++ = '.';
 125         }
 126         *ascii = '\0';
 127         return (start);
 128 }
 129
 130 /*! \file */