contrib/bind/lib/bind/inet/nsap_addr.c

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