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 1.3 2003/04/10 18:53:29 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 <stdlib.h>
  34 #include <errno.h>
  35
  36 #define IN6ADDRSZ              16
  37
  38 #if 0
  39 #ifndef HAVE_PORTABLE_PROTOTYPE
  40 #include "cdecl_ext.h"
  41 #endif
  42
  43 #ifndef HAVE_U_INT16_T
  44 #include "bittypes.h"
  45 #endif
  46 #if !(defined(HAVE_INADDRSZ) && defined(HAVE_IN6ADDRSZ))
  47 #include "addrsize.h"
  48 #endif
  49 #endif
  50 #ifndef NS_INADDRSZ
  51 #define NS_INADDRSZ     INADDRSZ
  52 #endif
  53 #ifndef NS_IN6ADDRSZ
  54 #define NS_IN6ADDRSZ    IN6ADDRSZ
  55 #endif
  56 #ifndef NS_INT16SZ
  57 #define NS_INT16SZ      sizeof(u_int16_t)
  58 #endif
  59
  60 /*
  61  * WARNING: Don't even consider trying to compile this on a system where
  62  * sizeof(int) < 4.  sizeof(int) > 4 is fine; all the world's not a VAX.
  63  */
  64
  65 static int      inet_pton4 __P((const char *src, u_char *dst));
  66 #ifdef INET6
  67 static int      inet_pton6 __P((const char *src, u_char *dst));
  68 #endif
  69
  70 /* int
  71  * inet_pton(af, src, dst)
  72  *      convert from presentation format (which usually means ASCII printable)
  73  *      to network format (which is usually some kind of binary format).
  74  * return:
  75  *      1 if the address was valid for the specified address family
  76  *      0 if the address wasn't valid (`dst' is untouched in this case)
  77  *      -1 if some other error occurred (`dst' is untouched in this case, too)
  78  * author:
  79  *      Paul Vixie, 1996.
  80  */
  81 int
  82 inet_pton(int af, const char *src, void *dst)
  83 {
  84         int status;
  85         char *p, *s;
  86
  87         switch (af)
  88         {
  89                 case AF_INET: return (inet_pton4(src, dst));
  90
  91 #ifdef INET6
  92                 case AF_INET6:
  93                         /* Ignore trailing %xxx (interface specification) */
  94
  95                         p = NULL;
  96                         s = (char *)src;
  97
  98                         if (src != NULL) p = strrchr(src, '%');
  99                         if (p != NULL)
 100                         {
 101                                 s = strdup(src);
 102                                 s[p - src] = '\0';
 103                         }
 104
 105                         status = inet_pton6(s, dst);
 106                         if (p != NULL) free(s);
 107                         return status;
 108 #endif
 109
 110                 default:
 111                         errno = EAFNOSUPPORT;
 112                         return -1;
 113         }
 114         /* NOTREACHED */
 115 }
 116
 117 /* int
 118  * inet_pton4(src, dst)
 119  *      like inet_aton() but without all the hexadecimal and shorthand.
 120  * return:
 121  *      1 if `src' is a valid dotted quad, else 0.
 122  * notice:
 123  *      does not touch `dst' unless it's returning 1.
 124  * author:
 125  *      Paul Vixie, 1996.
 126  */
 127 static int
 128 inet_pton4(src, dst)
 129         const char *src;
 130         u_char *dst;
 131 {
 132         static const char digits[] = "0123456789";
 133         int saw_digit, octets, ch;
 134         u_char tmp[NS_INADDRSZ], *tp;
 135
 136         saw_digit = 0;
 137         octets = 0;
 138         *(tp = tmp) = 0;
 139         while ((ch = *src++) != '\0') {
 140                 const char *pch;
 141
 142                 if ((pch = strchr(digits, ch)) != NULL) {
 143                         u_int new = *tp * 10 + (pch - digits);
 144
 145                         if (new > 255)
 146                                 return (0);
 147                         *tp = new;
 148                         if (! saw_digit) {
 149                                 if (++octets > 4)
 150                                         return (0);
 151                                 saw_digit = 1;
 152                         }
 153                 } else if (ch == '.' && saw_digit) {
 154                         if (octets == 4)
 155                                 return (0);
 156                         *++tp = 0;
 157                         saw_digit = 0;
 158                 } else
 159                         return (0);
 160         }
 161         if (octets < 4)
 162                 return (0);
 163         memcpy(dst, tmp, NS_INADDRSZ);
 164         return (1);
 165 }
 166
 167 #ifdef INET6
 168 /* int
 169  * inet_pton6(src, dst)
 170  *      convert presentation level address to network order binary form.
 171  * return:
 172  *      1 if `src' is a valid [RFC1884 2.2] address, else 0.
 173  * notice:
 174  *      (1) does not touch `dst' unless it's returning 1.
 175  *      (2) :: in a full address is silently ignored.
 176  * credit:
 177  *      inspired by Mark Andrews.
 178  * author:
 179  *      Paul Vixie, 1996.
 180  */
 181 static int
 182 inet_pton6(src, dst)
 183         const char *src;
 184         u_char *dst;
 185 {
 186         static const char xdigits_l[] = "0123456789abcdef",
 187                           xdigits_u[] = "0123456789ABCDEF";
 188         u_char tmp[NS_IN6ADDRSZ], *tp, *endp, *colonp;
 189         const char *xdigits, *curtok;
 190         int ch, saw_xdigit;
 191         u_int val;
 192
 193         memset((tp = tmp), '\0', NS_IN6ADDRSZ);
 194         endp = tp + NS_IN6ADDRSZ;
 195         colonp = NULL;
 196         /* Leading :: requires some special handling. */
 197         if (*src == ':')
 198                 if (*++src != ':')
 199                         return (0);
 200         curtok = src;
 201         saw_xdigit = 0;
 202         val = 0;
 203         while ((ch = *src++) != '\0') {
 204                 const char *pch;
 205
 206                 if ((pch = strchr((xdigits = xdigits_l), ch)) == NULL)
 207                         pch = strchr((xdigits = xdigits_u), ch);
 208                 if (pch != NULL) {
 209                         val <<= 4;
 210                         val |= (pch - xdigits);
 211                         if (val > 0xffff)
 212                                 return (0);
 213                         saw_xdigit = 1;
 214                         continue;
 215                 }
 216                 if (ch == ':') {
 217                         curtok = src;
 218                         if (!saw_xdigit) {
 219                                 if (colonp)
 220                                         return (0);
 221                                 colonp = tp;
 222                                 continue;
 223                         } else if (*src == '\0') {
 224                                 return (0);
 225                         }
 226                         if (tp + NS_INT16SZ > endp)
 227                                 return (0);
 228                         *tp++ = (u_char) (val >> 8) & 0xff;
 229                         *tp++ = (u_char) val & 0xff;
 230                         saw_xdigit = 0;
 231                         val = 0;
 232                         continue;
 233                 }
 234                 if (ch == '.' && ((tp + NS_INADDRSZ) <= endp) &&
 235                     inet_pton4(curtok, tp) > 0) {
 236                         tp += NS_INADDRSZ;
 237                         saw_xdigit = 0;
 238                         break;  /* '\0' was seen by inet_pton4(). */
 239                 }
 240                 return (0);
 241         }
 242         if (saw_xdigit) {
 243                 if (tp + NS_INT16SZ > endp)
 244                         return (0);
 245                 *tp++ = (u_char) (val >> 8) & 0xff;
 246                 *tp++ = (u_char) val & 0xff;
 247         }
 248         if (colonp != NULL) {
 249                 /*
 250                  * Since some memmove()'s erroneously fail to handle
 251                  * overlapping regions, we'll do the shift by hand.
 252                  */
 253                 const int n = tp - colonp;
 254                 int i;
 255
 256                 if (tp == endp)
 257                         return (0);
 258                 for (i = 1; i <= n; i++) {
 259                         endp[- i] = colonp[n - i];
 260                         colonp[n - i] = 0;
 261                 }
 262                 tp = endp;
 263         }
 264         if (tp != endp)
 265                 return (0);
 266         memcpy(dst, tmp, NS_IN6ADDRSZ);
 267         return (1);
 268 }
 269 #endif /*INET6*/