external/bsd/bind/dist/lib/lwres/lwinetpton.c

   1 /*      $NetBSD$        */
   2
   3 /*
   4  * Copyright (C) 2004, 2005, 2007  Internet Systems Consortium, Inc. ("ISC")
   5  * Copyright (C) 1996-2001  Internet Software Consortium.
   6  *
   7  * Permission to use, copy, modify, and/or 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 WITH
  12  * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
  13  * AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
  14  * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
  15  * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
  16  * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
  17  * PERFORMANCE OF THIS SOFTWARE.
  18  */
  19
  20 /*! \file lwinetpton.c
  21  */
  22
  23 #if defined(LIBC_SCCS) && !defined(lint)
  24 static char rcsid[] = "Id: lwinetpton.c,v 1.12 2007/06/19 23:47:22 tbox Exp";
  25 #endif /* LIBC_SCCS and not lint */
  26
  27 #include <config.h>
  28
  29 #include <errno.h>
  30 #include <string.h>
  31
  32 #include <lwres/net.h>
  33
  34 #define NS_INT16SZ       2
  35 #define NS_INADDRSZ      4
  36 #define NS_IN6ADDRSZ    16
  37
  38 /*
  39  * WARNING: Don't even consider trying to compile this on a system where
  40  * sizeof(int) < 4.  sizeof(int) > 4 is fine; all the world's not a VAX.
  41  */
  42
  43 static int inet_pton4(const char *src, unsigned char *dst);
  44 static int inet_pton6(const char *src, unsigned char *dst);
  45
  46 /*!
  47  * int
  48  * lwres_net_pton(af, src, dst)
  49  *      convert from presentation format (which usually means ASCII printable)
  50  *      to network format (which is usually some kind of binary format).
  51  * return:
  52  *      1 if the address was valid for the specified address family
  53  *      0 if the address wasn't valid (`dst' is untouched in this case)
  54  *      -1 if some other error occurred (`dst' is untouched in this case, too)
  55  * author:
  56  *      Paul Vixie, 1996.
  57  */
  58 int
  59 lwres_net_pton(int af, const char *src, void *dst) {
  60         switch (af) {
  61         case AF_INET:
  62                 return (inet_pton4(src, dst));
  63         case AF_INET6:
  64                 return (inet_pton6(src, dst));
  65         default:
  66                 errno = EAFNOSUPPORT;
  67                 return (-1);
  68         }
  69         /* NOTREACHED */
  70 }
  71
  72 /*! int
  73  * inet_pton4(src, dst)
  74  *      like inet_aton() but without all the hexadecimal and shorthand.
  75  * return:
  76  *      1 if `src' is a valid dotted quad, else 0.
  77  * notice:
  78  *      does not touch `dst' unless it's returning 1.
  79  * author:
  80  *      Paul Vixie, 1996.
  81  */
  82 static int
  83 inet_pton4(const char *src, unsigned char *dst) {
  84         static const char digits[] = "0123456789";
  85         int saw_digit, octets, ch;
  86         unsigned char tmp[NS_INADDRSZ], *tp;
  87
  88         saw_digit = 0;
  89         octets = 0;
  90         *(tp = tmp) = 0;
  91         while ((ch = *src++) != '\0') {
  92                 const char *pch;
  93
  94                 if ((pch = strchr(digits, ch)) != NULL) {
  95                         unsigned int new = *tp * 10 + (pch - digits);
  96
  97                         if (new > 255)
  98                                 return (0);
  99                         *tp = new;
 100                         if (! saw_digit) {
 101                                 if (++octets > 4)
 102                                         return (0);
 103                                 saw_digit = 1;
 104                         }
 105                 } else if (ch == '.' && saw_digit) {
 106                         if (octets == 4)
 107                                 return (0);
 108                         *++tp = 0;
 109                         saw_digit = 0;
 110                 } else
 111                         return (0);
 112         }
 113         if (octets < 4)
 114                 return (0);
 115         memcpy(dst, tmp, NS_INADDRSZ);
 116         return (1);
 117 }
 118
 119 /*! int
 120  * inet_pton6(src, dst)
 121  *      convert presentation level address to network order binary form.
 122  * return:
 123  *      1 if `src' is a valid [RFC1884 2.2] address, else 0.
 124  * notice:
 125  *      (1) does not touch `dst' unless it's returning 1.
 126  *      (2) :: in a full address is silently ignored.
 127  * credit:
 128  *      inspired by Mark Andrews.
 129  * author:
 130  *      Paul Vixie, 1996.
 131  */
 132 static int
 133 inet_pton6(const char *src, unsigned char *dst) {
 134         static const char xdigits_l[] = "0123456789abcdef",
 135                           xdigits_u[] = "0123456789ABCDEF";
 136         unsigned char tmp[NS_IN6ADDRSZ], *tp, *endp, *colonp;
 137         const char *xdigits, *curtok;
 138         int ch, seen_xdigits;
 139         unsigned int val;
 140
 141         memset((tp = tmp), '\0', NS_IN6ADDRSZ);
 142         endp = tp + NS_IN6ADDRSZ;
 143         colonp = NULL;
 144         /* Leading :: requires some special handling. */
 145         if (*src == ':')
 146                 if (*++src != ':')
 147                         return (0);
 148         curtok = src;
 149         seen_xdigits = 0;
 150         val = 0;
 151         while ((ch = *src++) != '\0') {
 152                 const char *pch;
 153
 154                 if ((pch = strchr((xdigits = xdigits_l), ch)) == NULL)
 155                         pch = strchr((xdigits = xdigits_u), ch);
 156                 if (pch != NULL) {
 157                         val <<= 4;
 158                         val |= (pch - xdigits);
 159                         if (++seen_xdigits > 4)
 160                                 return (0);
 161                         continue;
 162                 }
 163                 if (ch == ':') {
 164                         curtok = src;
 165                         if (!seen_xdigits) {
 166                                 if (colonp)
 167                                         return (0);
 168                                 colonp = tp;
 169                                 continue;
 170                         }
 171                         if (tp + NS_INT16SZ > endp)
 172                                 return (0);
 173                         *tp++ = (unsigned char) (val >> 8) & 0xff;
 174                         *tp++ = (unsigned char) val & 0xff;
 175                         seen_xdigits = 0;
 176                         val = 0;
 177                         continue;
 178                 }
 179                 if (ch == '.' && ((tp + NS_INADDRSZ) <= endp) &&
 180                     inet_pton4(curtok, tp) > 0) {
 181                         tp += NS_INADDRSZ;
 182                         seen_xdigits = 0;
 183                         break;  /* '\0' was seen by inet_pton4(). */
 184                 }
 185                 return (0);
 186         }
 187         if (seen_xdigits) {
 188                 if (tp + NS_INT16SZ > endp)
 189                         return (0);
 190                 *tp++ = (unsigned char) (val >> 8) & 0xff;
 191                 *tp++ = (unsigned char) val & 0xff;
 192         }
 193         if (colonp != NULL) {
 194                 /*
 195                  * Since some memmove()'s erroneously fail to handle
 196                  * overlapping regions, we'll do the shift by hand.
 197                  */
 198                 const int n = tp - colonp;
 199                 int i;
 200
 201                 for (i = 1; i <= n; i++) {
 202                         endp[- i] = colonp[n - i];
 203                         colonp[n - i] = 0;
 204                 }
 205                 tp = endp;
 206         }
 207         if (tp != endp)
 208                 return (0);
 209         memcpy(dst, tmp, NS_IN6ADDRSZ);
 210         return (1);
 211 }