wsutil/inet_pton.c

   1 /*
   2  * Copyright (c) 1996,1999 by Internet Software Consortium.
   3  *
   4  * $Id$
   5  *
   6  * Permission to use, copy, modify, and distribute this software for any
   7  * purpose with or without fee is hereby granted, provided that the above
   8  * copyright notice and this permission notice appear in all copies.
   9  *
  10  * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
  11  * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
  12  * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
  13  * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
  14  * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
  15  * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
  16  * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
  17  * SOFTWARE.
  18  */
  19
  20 #include "config.h"
  21
  22 #ifdef HAVE_SYS_PARAM_H
  23 #include <sys/param.h>
  24 #endif
  25
  26 #ifdef HAVE_SYS_TYPES_H
  27 #include <sys/types.h>
  28 #endif
  29
  30 #ifdef HAVE_SYS_SOCKET_H
  31 #include <sys/socket.h>         /* needed to define AF_ values on UNIX */
  32 #endif
  33
  34 #ifdef HAVE_WINSOCK2_H
  35 #include <winsock2.h>   /* needed to define AF_ values on Windows */
  36 #if _MSC_VER < 1600     /* errno.h defines EAFNOSUPPORT in Windows VC10 (and presumably eventually in VC11 ...) */
  37 #define EAFNOSUPPORT    WSAEAFNOSUPPORT
  38 #endif
  39 #endif
  40
  41 #ifdef HAVE_NETINET_IN_H
  42 #include <netinet/in.h>
  43 #endif
  44
  45 #ifdef HAVE_ARPA_INET_H
  46 #include <arpa/inet.h>
  47 #endif
  48
  49 #ifdef HAVE_ARPA_NAMESER_H
  50 #include <arpa/nameser.h>
  51 #endif
  52
  53 #include <string.h>
  54 #include <errno.h>
  55
  56 #include "inet_v6defs.h"
  57
  58 #ifndef NS_INADDRSZ
  59 #define NS_INADDRSZ     4
  60 #endif
  61 #ifndef NS_IN6ADDRSZ
  62 #define NS_IN6ADDRSZ    16
  63 #endif
  64 #ifndef NS_INT16SZ
  65 #define NS_INT16SZ      2
  66 #endif
  67
  68 /*
  69  * WARNING: Don't even consider trying to compile this on a system where
  70  * sizeof(int) < 4.  sizeof(int) > 4 is fine; all the world's not a VAX.
  71  */
  72
  73 #ifdef AF_INET
  74 static int      inet_pton4 __P((const char *src, u_char *dst));
  75 #endif
  76 #ifdef AF_INET6
  77 static int      inet_pton6 __P((const char *src, u_char *dst));
  78 #endif
  79
  80 /* int
  81  * inet_pton(af, src, dst)
  82  *      convert from presentation format (which usually means ASCII printable)
  83  *      to network format (which is usually some kind of binary format).
  84  * return:
  85  *      1 if the address was valid for the specified address family
  86  *      0 if the address wasn't valid (`dst' is untouched in this case)
  87  *      -1 if some other error occurred (`dst' is untouched in this case, too)
  88  * author:
  89  *      Paul Vixie, 1996.
  90  */
  91 int
  92 inet_pton(af, src, dst)
  93         int af;
  94         const char *src;
  95         void *dst;
  96 {
  97         switch (af) {
  98 #ifdef AF_INET
  99         case AF_INET:
 100                 return (inet_pton4(src, dst));
 101 #endif
 102 #ifdef AF_INET6
 103         case AF_INET6:
 104                 return (inet_pton6(src, dst));
 105 #endif
 106         default:
 107                 errno = EAFNOSUPPORT;
 108                 return (-1);
 109         }
 110         /* NOTREACHED */
 111 }
 112
 113 #ifdef AF_INET
 114 /* int
 115  * inet_pton4(src, dst)
 116  *      like inet_aton() but without all the hexadecimal and shorthand.
 117  * return:
 118  *      1 if `src' is a valid dotted quad, else 0.
 119  * notice:
 120  *      does not touch `dst' unless it's returning 1.
 121  * author:
 122  *      Paul Vixie, 1996.
 123  */
 124 static int
 125 inet_pton4(src, dst)
 126         const char *src;
 127         u_char *dst;
 128 {
 129         static const char digits[] = "0123456789";
 130         int saw_digit, octets, ch;
 131         u_char tmp[NS_INADDRSZ], *tp;
 132
 133         saw_digit = 0;
 134         octets = 0;
 135         *(tp = tmp) = 0;
 136         while ((ch = *src++) != '\0') {
 137                 const char *pch;
 138
 139                 if ((pch = strchr(digits, ch)) != NULL) {
 140                         size_t new = *tp * 10 + (pch - digits);
 141
 142                         if (new > 255)
 143                                 return (0);
 144                         *tp = (u_char) new;
 145                         if (! saw_digit) {
 146                                 if (++octets > 4)
 147                                         return (0);
 148                                 saw_digit = 1;
 149                         }
 150                 } else if (ch == '.' && saw_digit) {
 151                         if (octets == 4)
 152                                 return (0);
 153                         *++tp = 0;
 154                         saw_digit = 0;
 155                 } else
 156                         return (0);
 157         }
 158         if (octets < 4)
 159                 return (0);
 160         memcpy(dst, tmp, NS_INADDRSZ);
 161         return (1);
 162 }
 163 #endif
 164
 165 #ifdef AF_INET6
 166 /* int
 167  * inet_pton6(src, dst)
 168  *      convert presentation level address to network order binary form.
 169  * return:
 170  *      1 if `src' is a valid [RFC1884 2.2] address, else 0.
 171  * notice:
 172  *      (1) does not touch `dst' unless it's returning 1.
 173  *      (2) :: in a full address is silently ignored.
 174  * credit:
 175  *      inspired by Mark Andrews.
 176  * author:
 177  *      Paul Vixie, 1996.
 178  */
 179 static int
 180 inet_pton6(src, dst)
 181         const char *src;
 182         u_char *dst;
 183 {
 184         static const char xdigits_l[] = "0123456789abcdef",
 185                           xdigits_u[] = "0123456789ABCDEF";
 186         u_char tmp[NS_IN6ADDRSZ], *tp, *endp, *colonp;
 187         const char *xdigits, *curtok;
 188         int ch, saw_xdigit;
 189         u_int val;
 190
 191         memset((tp = tmp), '\0', NS_IN6ADDRSZ);
 192         endp = tp + NS_IN6ADDRSZ;
 193         colonp = NULL;
 194         /* Leading :: requires some special handling. */
 195         if (*src == ':')
 196                 if (*++src != ':')
 197                         return (0);
 198         curtok = src;
 199         saw_xdigit = 0;
 200         val = 0;
 201         while ((ch = *src++) != '\0') {
 202                 const char *pch;
 203
 204                 if ((pch = strchr((xdigits = xdigits_l), ch)) == NULL)
 205                         pch = strchr((xdigits = xdigits_u), ch);
 206                 if (pch != NULL) {
 207                         val <<= 4;
 208                         val |= (pch - xdigits);
 209                         if (val > 0xffff)
 210                                 return (0);
 211                         saw_xdigit = 1;
 212                         continue;
 213                 }
 214                 if (ch == ':') {
 215                         curtok = src;
 216                         if (!saw_xdigit) {
 217                                 if (colonp)
 218                                         return (0);
 219                                 colonp = tp;
 220                                 continue;
 221                         } else if (*src == '\0') {
 222                                 return (0);
 223                         }
 224                         if (tp + NS_INT16SZ > endp)
 225                                 return (0);
 226                         *tp++ = (u_char) (val >> 8) & 0xff;
 227                         *tp++ = (u_char) val & 0xff;
 228                         saw_xdigit = 0;
 229                         val = 0;
 230                         continue;
 231                 }
 232                 if (ch == '.' && ((tp + NS_INADDRSZ) <= endp) &&
 233                     inet_pton4(curtok, tp) > 0) {
 234                         tp += NS_INADDRSZ;
 235                         saw_xdigit = 0;
 236                         break;  /* '\0' was seen by inet_pton4(). */
 237                 }
 238                 return (0);
 239         }
 240         if (saw_xdigit) {
 241                 if (tp + NS_INT16SZ > endp)
 242                         return (0);
 243                 *tp++ = (u_char) (val >> 8) & 0xff;
 244                 *tp++ = (u_char) val & 0xff;
 245         }
 246         if (colonp != NULL) {
 247                 /*
 248                  * Since some memmove()'s erroneously fail to handle
 249                  * overlapping regions, we'll do the shift by hand.
 250                  */
 251                 const int n = (int) (tp - colonp);
 252                 int i;
 253
 254                 if (tp == endp)
 255                         return (0);
 256                 for (i = 1; i <= n; i++) {
 257                         endp[- i] = colonp[n - i];
 258                         colonp[n - i] = 0;
 259                 }
 260                 tp = endp;
 261         }
 262         if (tp != endp)
 263                 return (0);
 264         memcpy(dst, tmp, NS_IN6ADDRSZ);
 265         return (1);
 266 }
 267 #endif