external/bsd/libbind/dist/inet/inet_pton.c

   1 /*      $NetBSD$        */
   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 #if defined(LIBC_SCCS) && !defined(lint)
  21 static const char rcsid[] = "Id: inet_pton.c,v 1.5 2005/07/28 06:51:47 marka Exp";
  22 #endif /* LIBC_SCCS and not lint */
  23
  24 #include "port_before.h"
  25 #include <sys/param.h>
  26 #include <sys/types.h>
  27 #include <sys/socket.h>
  28 #include <netinet/in.h>
  29 #include <arpa/inet.h>
  30 #include <arpa/nameser.h>
  31 #include <string.h>
  32 #include <errno.h>
  33 #include "port_after.h"
  34
  35 /*%
  36  * WARNING: Don't even consider trying to compile this on a system where
  37  * sizeof(int) < 4.  sizeof(int) > 4 is fine; all the world's not a VAX.
  38  */
  39
  40 static int      inet_pton4 __P((const char *src, u_char *dst));
  41 static int      inet_pton6 __P((const char *src, u_char *dst));
  42
  43 /* int
  44  * inet_pton(af, src, dst)
  45  *      convert from presentation format (which usually means ASCII printable)
  46  *      to network format (which is usually some kind of binary format).
  47  * return:
  48  *      1 if the address was valid for the specified address family
  49  *      0 if the address wasn't valid (`dst' is untouched in this case)
  50  *      -1 if some other error occurred (`dst' is untouched in this case, too)
  51  * author:
  52  *      Paul Vixie, 1996.
  53  */
  54 int
  55 inet_pton(af, src, dst)
  56         int af;
  57         const char *src;
  58         void *dst;
  59 {
  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(src, dst)
  84         const char *src;
  85         u_char *dst;
  86 {
  87         static const char digits[] = "0123456789";
  88         int saw_digit, octets, ch;
  89         u_char tmp[NS_INADDRSZ], *tp;
  90
  91         saw_digit = 0;
  92         octets = 0;
  93         *(tp = tmp) = 0;
  94         while ((ch = *src++) != '\0') {
  95                 const char *pch;
  96
  97                 if ((pch = strchr(digits, ch)) != NULL) {
  98                         u_int new = *tp * 10 + (pch - digits);
  99
 100                         if (saw_digit && *tp == 0)
 101                                 return (0);
 102                         if (new > 255)
 103                                 return (0);
 104                         *tp = new;
 105                         if (!saw_digit) {
 106                                 if (++octets > 4)
 107                                         return (0);
 108                                 saw_digit = 1;
 109                         }
 110                 } else if (ch == '.' && saw_digit) {
 111                         if (octets == 4)
 112                                 return (0);
 113                         *++tp = 0;
 114                         saw_digit = 0;
 115                 } else
 116                         return (0);
 117         }
 118         if (octets < 4)
 119                 return (0);
 120         memcpy(dst, tmp, NS_INADDRSZ);
 121         return (1);
 122 }
 123
 124 /* int
 125  * inet_pton6(src, dst)
 126  *      convert presentation level address to network order binary form.
 127  * return:
 128  *      1 if `src' is a valid [RFC1884 2.2] address, else 0.
 129  * notice:
 130  *      (1) does not touch `dst' unless it's returning 1.
 131  *      (2) :: in a full address is silently ignored.
 132  * credit:
 133  *      inspired by Mark Andrews.
 134  * author:
 135  *      Paul Vixie, 1996.
 136  */
 137 static int
 138 inet_pton6(src, dst)
 139         const char *src;
 140         u_char *dst;
 141 {
 142         static const char xdigits_l[] = "0123456789abcdef",
 143                           xdigits_u[] = "0123456789ABCDEF";
 144         u_char tmp[NS_IN6ADDRSZ], *tp, *endp, *colonp;
 145         const char *xdigits, *curtok;
 146         int ch, seen_xdigits;
 147         u_int val;
 148
 149         memset((tp = tmp), '\0', NS_IN6ADDRSZ);
 150         endp = tp + NS_IN6ADDRSZ;
 151         colonp = NULL;
 152         /* Leading :: requires some special handling. */
 153         if (*src == ':')
 154                 if (*++src != ':')
 155                         return (0);
 156         curtok = src;
 157         seen_xdigits = 0;
 158         val = 0;
 159         while ((ch = *src++) != '\0') {
 160                 const char *pch;
 161
 162                 if ((pch = strchr((xdigits = xdigits_l), ch)) == NULL)
 163                         pch = strchr((xdigits = xdigits_u), ch);
 164                 if (pch != NULL) {
 165                         val <<= 4;
 166                         val |= (pch - xdigits);
 167                         if (++seen_xdigits > 4)
 168                                 return (0);
 169                         continue;
 170                 }
 171                 if (ch == ':') {
 172                         curtok = src;
 173                         if (!seen_xdigits) {
 174                                 if (colonp)
 175                                         return (0);
 176                                 colonp = tp;
 177                                 continue;
 178                         } else if (*src == '\0') {
 179                                 return (0);
 180                         }
 181                         if (tp + NS_INT16SZ > endp)
 182                                 return (0);
 183                         *tp++ = (u_char) (val >> 8) & 0xff;
 184                         *tp++ = (u_char) val & 0xff;
 185                         seen_xdigits = 0;
 186                         val = 0;
 187                         continue;
 188                 }
 189                 if (ch == '.' && ((tp + NS_INADDRSZ) <= endp) &&
 190                     inet_pton4(curtok, tp) > 0) {
 191                         tp += NS_INADDRSZ;
 192                         seen_xdigits = 0;
 193                         break;  /*%< '\\0' was seen by inet_pton4(). */
 194                 }
 195                 return (0);
 196         }
 197         if (seen_xdigits) {
 198                 if (tp + NS_INT16SZ > endp)
 199                         return (0);
 200                 *tp++ = (u_char) (val >> 8) & 0xff;
 201                 *tp++ = (u_char) val & 0xff;
 202         }
 203         if (colonp != NULL) {
 204                 /*
 205                  * Since some memmove()'s erroneously fail to handle
 206                  * overlapping regions, we'll do the shift by hand.
 207                  */
 208                 const int n = tp - colonp;
 209                 int i;
 210
 211                 if (tp == endp)
 212                         return (0);
 213                 for (i = 1; i <= n; i++) {
 214                         endp[- i] = colonp[n - i];
 215                         colonp[n - i] = 0;
 216                 }
 217                 tp = endp;
 218         }
 219         if (tp != endp)
 220                 return (0);
 221         memcpy(dst, tmp, NS_IN6ADDRSZ);
 222         return (1);
 223 }
 224
 225 /*! \file */