contrib/bind/lib/bind/inet/inet_pton.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: inet_pton.c,v 1.5 2005/07/28 06:51:47 marka Exp $";
  20 #endif /* LIBC_SCCS and not lint */
  21
  22 #include "port_before.h"
  23 #include <sys/param.h>
  24 #include <sys/types.h>
  25 #include <sys/socket.h>
  26 #include <netinet/in.h>
  27 #include <arpa/inet.h>
  28 #include <arpa/nameser.h>
  29 #include <string.h>
  30 #include <errno.h>
  31 #include "port_after.h"
  32
  33 /*%
  34  * WARNING: Don't even consider trying to compile this on a system where
  35  * sizeof(int) < 4.  sizeof(int) > 4 is fine; all the world's not a VAX.
  36  */
  37
  38 static int      inet_pton4 __P((const char *src, u_char *dst));
  39 static int      inet_pton6 __P((const char *src, u_char *dst));
  40
  41 /* int
  42  * inet_pton(af, src, dst)
  43  *      convert from presentation format (which usually means ASCII printable)
  44  *      to network format (which is usually some kind of binary format).
  45  * return:
  46  *      1 if the address was valid for the specified address family
  47  *      0 if the address wasn't valid (`dst' is untouched in this case)
  48  *      -1 if some other error occurred (`dst' is untouched in this case, too)
  49  * author:
  50  *      Paul Vixie, 1996.
  51  */
  52 int
  53 inet_pton(af, src, dst)
  54         int af;
  55         const char *src;
  56         void *dst;
  57 {
  58         switch (af) {
  59         case AF_INET:
  60                 return (inet_pton4(src, dst));
  61         case AF_INET6:
  62                 return (inet_pton6(src, dst));
  63         default:
  64                 errno = EAFNOSUPPORT;
  65                 return (-1);
  66         }
  67         /* NOTREACHED */
  68 }
  69
  70 /* int
  71  * inet_pton4(src, dst)
  72  *      like inet_aton() but without all the hexadecimal and shorthand.
  73  * return:
  74  *      1 if `src' is a valid dotted quad, else 0.
  75  * notice:
  76  *      does not touch `dst' unless it's returning 1.
  77  * author:
  78  *      Paul Vixie, 1996.
  79  */
  80 static int
  81 inet_pton4(src, dst)
  82         const char *src;
  83         u_char *dst;
  84 {
  85         static const char digits[] = "0123456789";
  86         int saw_digit, octets, ch;
  87         u_char tmp[NS_INADDRSZ], *tp;
  88
  89         saw_digit = 0;
  90         octets = 0;
  91         *(tp = tmp) = 0;
  92         while ((ch = *src++) != '\0') {
  93                 const char *pch;
  94
  95                 if ((pch = strchr(digits, ch)) != NULL) {
  96                         u_int new = *tp * 10 + (pch - digits);
  97
  98                         if (saw_digit && *tp == 0)
  99                                 return (0);
 100                         if (new > 255)
 101                                 return (0);
 102                         *tp = new;
 103                         if (!saw_digit) {
 104                                 if (++octets > 4)
 105                                         return (0);
 106                                 saw_digit = 1;
 107                         }
 108                 } else if (ch == '.' && saw_digit) {
 109                         if (octets == 4)
 110                                 return (0);
 111                         *++tp = 0;
 112                         saw_digit = 0;
 113                 } else
 114                         return (0);
 115         }
 116         if (octets < 4)
 117                 return (0);
 118         memcpy(dst, tmp, NS_INADDRSZ);
 119         return (1);
 120 }
 121
 122 /* int
 123  * inet_pton6(src, dst)
 124  *      convert presentation level address to network order binary form.
 125  * return:
 126  *      1 if `src' is a valid [RFC1884 2.2] address, else 0.
 127  * notice:
 128  *      (1) does not touch `dst' unless it's returning 1.
 129  *      (2) :: in a full address is silently ignored.
 130  * credit:
 131  *      inspired by Mark Andrews.
 132  * author:
 133  *      Paul Vixie, 1996.
 134  */
 135 static int
 136 inet_pton6(src, dst)
 137         const char *src;
 138         u_char *dst;
 139 {
 140         static const char xdigits_l[] = "0123456789abcdef",
 141                           xdigits_u[] = "0123456789ABCDEF";
 142         u_char tmp[NS_IN6ADDRSZ], *tp, *endp, *colonp;
 143         const char *xdigits, *curtok;
 144         int ch, seen_xdigits;
 145         u_int val;
 146
 147         memset((tp = tmp), '\0', NS_IN6ADDRSZ);
 148         endp = tp + NS_IN6ADDRSZ;
 149         colonp = NULL;
 150         /* Leading :: requires some special handling. */
 151         if (*src == ':')
 152                 if (*++src != ':')
 153                         return (0);
 154         curtok = src;
 155         seen_xdigits = 0;
 156         val = 0;
 157         while ((ch = *src++) != '\0') {
 158                 const char *pch;
 159
 160                 if ((pch = strchr((xdigits = xdigits_l), ch)) == NULL)
 161                         pch = strchr((xdigits = xdigits_u), ch);
 162                 if (pch != NULL) {
 163                         val <<= 4;
 164                         val |= (pch - xdigits);
 165                         if (++seen_xdigits > 4)
 166                                 return (0);
 167                         continue;
 168                 }
 169                 if (ch == ':') {
 170                         curtok = src;
 171                         if (!seen_xdigits) {
 172                                 if (colonp)
 173                                         return (0);
 174                                 colonp = tp;
 175                                 continue;
 176                         } else if (*src == '\0') {
 177                                 return (0);
 178                         }
 179                         if (tp + NS_INT16SZ > endp)
 180                                 return (0);
 181                         *tp++ = (u_char) (val >> 8) & 0xff;
 182                         *tp++ = (u_char) val & 0xff;
 183                         seen_xdigits = 0;
 184                         val = 0;
 185                         continue;
 186                 }
 187                 if (ch == '.' && ((tp + NS_INADDRSZ) <= endp) &&
 188                     inet_pton4(curtok, tp) > 0) {
 189                         tp += NS_INADDRSZ;
 190                         seen_xdigits = 0;
 191                         break;  /*%< '\\0' was seen by inet_pton4(). */
 192                 }
 193                 return (0);
 194         }
 195         if (seen_xdigits) {
 196                 if (tp + NS_INT16SZ > endp)
 197                         return (0);
 198                 *tp++ = (u_char) (val >> 8) & 0xff;
 199                 *tp++ = (u_char) val & 0xff;
 200         }
 201         if (colonp != NULL) {
 202                 /*
 203                  * Since some memmove()'s erroneously fail to handle
 204                  * overlapping regions, we'll do the shift by hand.
 205                  */
 206                 const int n = tp - colonp;
 207                 int i;
 208
 209                 if (tp == endp)
 210                         return (0);
 211                 for (i = 1; i <= n; i++) {
 212                         endp[- i] = colonp[n - i];
 213                         colonp[n - i] = 0;
 214                 }
 215                 tp = endp;
 216         }
 217         if (tp != endp)
 218                 return (0);
 219         memcpy(dst, tmp, NS_IN6ADDRSZ);
 220         return (1);
 221 }
 222
 223 #ifdef _LIBC
 224 /*
 225  * Weak aliases for applications that use certain private entry points,
 226  * and fail to include <arpa/inet.h>.
 227  */
 228 #undef inet_pton
 229 __weak_reference(__inet_pton, inet_pton);
 230 #endif
 231 /*! \file */