lib/libc/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  * $Id: nsap_addr.c,v 1.5 2005/07/28 06:51:48 marka Exp $
  18  */
  19
  20 #include "port_before.h"
  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 #include "resolv_mt.h"
  33
  34 #include "port_after.h"
  35
  36 static char
  37 xtob(int c) {
  38         return (c - (((c >= '0') && (c <= '9')) ? '0' : '7'));
  39 }
  40
  41 u_int
  42 inet_nsap_addr(const char *ascii, u_char *binary, int maxlen) {
  43         u_char c, nib;
  44         u_int len = 0;
  45
  46         if (ascii[0] != '0' || (ascii[1] != 'x' && ascii[1] != 'X'))
  47                 return (0);
  48         ascii += 2;
  49
  50         while ((c = *ascii++) != '\0' && len < (u_int)maxlen) {
  51                 if (c == '.' || c == '+' || c == '/')
  52                         continue;
  53                 if (!isascii(c))
  54                         return (0);
  55                 if (islower(c))
  56                         c = toupper(c);
  57                 if (isxdigit(c)) {
  58                         nib = xtob(c);
  59                         c = *ascii++;
  60                         if (c != '\0') {
  61                                 c = toupper(c);
  62                                 if (isxdigit(c)) {
  63                                         *binary++ = (nib << 4) | xtob(c);
  64                                         len++;
  65                                 } else
  66                                         return (0);
  67                         }
  68                         else
  69                                 return (0);
  70                 }
  71                 else
  72                         return (0);
  73         }
  74         return (len);
  75 }
  76
  77 char *
  78 inet_nsap_ntoa(int binlen, const u_char *binary, char *ascii) {
  79         int nib;
  80         int i;
  81         char *tmpbuf = inet_nsap_ntoa_tmpbuf;
  82         char *start;
  83
  84         if (ascii)
  85                 start = ascii;
  86         else {
  87                 ascii = tmpbuf;
  88                 start = tmpbuf;
  89         }
  90
  91         *ascii++ = '0';
  92         *ascii++ = 'x';
  93
  94         if (binlen > 255)
  95                 binlen = 255;
  96
  97         for (i = 0; i < binlen; i++) {
  98                 nib = *binary >> 4;
  99                 *ascii++ = nib + (nib < 10 ? '0' : '7');
 100                 nib = *binary++ & 0x0f;
 101                 *ascii++ = nib + (nib < 10 ? '0' : '7');
 102                 if (((i % 2) == 0 && (i + 1) < binlen))
 103                         *ascii++ = '.';
 104         }
 105         *ascii = '\0';
 106         return (start);
 107 }
 108
 109 /*
 110  * Weak aliases for applications that use certain private entry points,
 111  * and fail to include <arpa/inet.h>.
 112  */
 113 #undef inet_nsap_addr
 114 __weak_reference(__inet_nsap_addr, inet_nsap_addr);
 115 #undef inet_nsap_ntoa
 116 __weak_reference(__inet_nsap_ntoa, inet_nsap_ntoa);