gen.subproj/inet_pton.c

   1 /*
   2  * Copyright (c) 1996,1999 by Internet Software Consortium.
   3  *
   4  * Permission to use, copy, modify, and distribute this software for any
   5  * purpose with or without fee is hereby granted, provided that the above
   6  * copyright notice and this permission notice appear in all copies.
   7  *
   8  * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
   9  * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
  10  * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
  11  * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
  12  * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
  13  * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
  14  * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
  15  * SOFTWARE.
  16  */
  17
  18 #if defined(LIBC_SCCS) && !defined(lint)
  19 static char rcsid[] = "$Id: inet_pton.c,v 1.2 2002/01/17 22:22:25 majka Exp $";
  20 #endif /* LIBC_SCCS and not lint */
  21
  22 #ifdef HAVE_CONFIG_H
  23 #include <config.h>
  24 #endif
  25
  26 #include <sys/param.h>
  27 #include <sys/types.h>
  28 #include <sys/socket.h>
  29 #include <netinet/in.h>
  30 #include <arpa/inet.h>
  31 #include <arpa/nameser.h>
  32 #include <string.h>
  33 #include <errno.h>
  34
  35 #define IN6ADDRSZ              16
  36
  37 #if 0
  38 #ifndef HAVE_PORTABLE_PROTOTYPE
  39 #include "cdecl_ext.h"
  40 #endif
  41
  42 #ifndef HAVE_U_INT16_T
  43 #include "bittypes.h"
  44 #endif
  45 #if !(defined(HAVE_INADDRSZ) && defined(HAVE_IN6ADDRSZ))
  46 #include "addrsize.h"
  47 #endif
  48 #endif
  49 #ifndef NS_INADDRSZ
  50 #define NS_INADDRSZ     INADDRSZ
  51 #endif
  52 #ifndef NS_IN6ADDRSZ
  53 #define NS_IN6ADDRSZ    IN6ADDRSZ
  54 #endif
  55 #ifndef NS_INT16SZ
  56 #define NS_INT16SZ      sizeof(u_int16_t)
  57 #endif
  58
  59 /*
  60  * WARNING: Don't even consider trying to compile this on a system where
  61  * sizeof(int) < 4.  sizeof(int) > 4 is fine; all the world's not a VAX.
  62  */
  63
  64 static int      inet_pton4 __P((const char *src, u_char *dst));
  65 #ifdef INET6
  66 static int      inet_pton6 __P((const char *src, u_char *dst));
  67 #endif
  68
  69 /* int
  70  * inet_pton(af, src, dst)
  71  *      convert from presentation format (which usually means ASCII printable)
  72  *      to network format (which is usually some kind of binary format).
  73  * return:
  74  *      1 if the address was valid for the specified address family
  75  *      0 if the address wasn't valid (`dst' is untouched in this case)
  76  *      -1 if some other error occurred (`dst' is untouched in this case, too)
  77  * author:
  78  *      Paul Vixie, 1996.
  79  */
  80 int
  81 inet_pton(af, src, dst)
  82         int af;
  83         const char *src;
  84         void *dst;
  85 {
  86         switch (af) {
  87         case AF_INET:
  88                 return (inet_pton4(src, dst));
  89 #ifdef INET6
  90         case AF_INET6:
  91                 return (inet_pton6(src, dst));
  92 #endif
  93         default:
  94                 errno = EAFNOSUPPORT;
  95                 return (-1);
  96         }
  97         /* NOTREACHED */
  98 }
  99
 100 /* int
 101  * inet_pton4(src, dst)
 102  *      like inet_aton() but without all the hexadecimal and shorthand.
 103  * return:
 104  *      1 if `src' is a valid dotted quad, else 0.
 105  * notice:
 106  *      does not touch `dst' unless it's returning 1.
 107  * author:
 108  *      Paul Vixie, 1996.
 109  */
 110 static int
 111 inet_pton4(src, dst)
 112         const char *src;
 113         u_char *dst;
 114 {
 115         static const char digits[] = "0123456789";
 116         int saw_digit, octets, ch;
 117         u_char tmp[NS_INADDRSZ], *tp;
 118
 119         saw_digit = 0;
 120         octets = 0;
 121         *(tp = tmp) = 0;
 122         while ((ch = *src++) != '\0') {
 123                 const char *pch;
 124
 125                 if ((pch = strchr(digits, ch)) != NULL) {
 126                         u_int new = *tp * 10 + (pch - digits);
 127
 128                         if (new > 255)
 129                                 return (0);
 130                         *tp = new;
 131                         if (! saw_digit) {
 132                                 if (++octets > 4)
 133                                         return (0);
 134                                 saw_digit = 1;
 135                         }
 136                 } else if (ch == '.' && saw_digit) {
 137                         if (octets == 4)
 138                                 return (0);
 139                         *++tp = 0;
 140                         saw_digit = 0;
 141                 } else
 142                         return (0);
 143         }
 144         if (octets < 4)
 145                 return (0);
 146         memcpy(dst, tmp, NS_INADDRSZ);
 147         return (1);
 148 }
 149
 150 #ifdef INET6
 151 /* int
 152  * inet_pton6(src, dst)
 153  *      convert presentation level address to network order binary form.
 154  * return:
 155  *      1 if `src' is a valid [RFC1884 2.2] address, else 0.
 156  * notice:
 157  *      (1) does not touch `dst' unless it's returning 1.
 158  *      (2) :: in a full address is silently ignored.
 159  * credit:
 160  *      inspired by Mark Andrews.
 161  * author:
 162  *      Paul Vixie, 1996.
 163  */
 164 static int
 165 inet_pton6(src, dst)
 166         const char *src;
 167         u_char *dst;
 168 {
 169         static const char xdigits_l[] = "0123456789abcdef",
 170                           xdigits_u[] = "0123456789ABCDEF";
 171         u_char tmp[NS_IN6ADDRSZ], *tp, *endp, *colonp;
 172         const char *xdigits, *curtok;
 173         int ch, saw_xdigit;
 174         u_int val;
 175
 176         memset((tp = tmp), '\0', NS_IN6ADDRSZ);
 177         endp = tp + NS_IN6ADDRSZ;
 178         colonp = NULL;
 179         /* Leading :: requires some special handling. */
 180         if (*src == ':')
 181                 if (*++src != ':')
 182                         return (0);
 183         curtok = src;
 184         saw_xdigit = 0;
 185         val = 0;
 186         while ((ch = *src++) != '\0') {
 187                 const char *pch;
 188
 189                 if ((pch = strchr((xdigits = xdigits_l), ch)) == NULL)
 190                         pch = strchr((xdigits = xdigits_u), ch);
 191                 if (pch != NULL) {
 192                         val <<= 4;
 193                         val |= (pch - xdigits);
 194                         if (val > 0xffff)
 195                                 return (0);
 196                         saw_xdigit = 1;
 197                         continue;
 198                 }
 199                 if (ch == ':') {
 200                         curtok = src;
 201                         if (!saw_xdigit) {
 202                                 if (colonp)
 203                                         return (0);
 204                                 colonp = tp;
 205                                 continue;
 206                         } else if (*src == '\0') {
 207                                 return (0);
 208                         }
 209                         if (tp + NS_INT16SZ > endp)
 210                                 return (0);
 211                         *tp++ = (u_char) (val >> 8) & 0xff;
 212                         *tp++ = (u_char) val & 0xff;
 213                         saw_xdigit = 0;
 214                         val = 0;
 215                         continue;
 216                 }
 217                 if (ch == '.' && ((tp + NS_INADDRSZ) <= endp) &&
 218                     inet_pton4(curtok, tp) > 0) {
 219                         tp += NS_INADDRSZ;
 220                         saw_xdigit = 0;
 221                         break;  /* '\0' was seen by inet_pton4(). */
 222                 }
 223                 return (0);
 224         }
 225         if (saw_xdigit) {
 226                 if (tp + NS_INT16SZ > endp)
 227                         return (0);
 228                 *tp++ = (u_char) (val >> 8) & 0xff;
 229                 *tp++ = (u_char) val & 0xff;
 230         }
 231         if (colonp != NULL) {
 232                 /*
 233                  * Since some memmove()'s erroneously fail to handle
 234                  * overlapping regions, we'll do the shift by hand.
 235                  */
 236                 const int n = tp - colonp;
 237                 int i;
 238
 239                 if (tp == endp)
 240                         return (0);
 241                 for (i = 1; i <= n; i++) {
 242                         endp[- i] = colonp[n - i];
 243                         colonp[n - i] = 0;
 244                 }
 245                 tp = endp;
 246         }
 247         if (tp != endp)
 248                 return (0);
 249         memcpy(dst, tmp, NS_IN6ADDRSZ);
 250         return (1);
 251 }
 252 #endif /*INET6*/