net/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 <net/if.h>
  32 #include <arpa/nameser.h>
  33 #include <string.h>
  34 #include <stdlib.h>
  35 #include <errno.h>
  36
  37 #define INET6 1
  38
  39 #define IN6ADDRSZ              16
  40
  41 #if 0
  42 #ifndef HAVE_PORTABLE_PROTOTYPE
  43 #include "cdecl_ext.h"
  44 #endif
  45
  46 #ifndef HAVE_U_INT16_T
  47 #include "bittypes.h"
  48 #endif
  49 #if !(defined(HAVE_INADDRSZ) && defined(HAVE_IN6ADDRSZ))
  50 #include "addrsize.h"
  51 #endif
  52 #endif
  53 #ifndef NS_INADDRSZ
  54 #define NS_INADDRSZ     INADDRSZ
  55 #endif
  56 #ifndef NS_IN6ADDRSZ
  57 #define NS_IN6ADDRSZ    IN6ADDRSZ
  58 #endif
  59 #ifndef NS_INT16SZ
  60 #define NS_INT16SZ      sizeof(u_int16_t)
  61 #endif
  62
  63 /*
  64  * WARNING: Don't even consider trying to compile this on a system where
  65  * sizeof(int) < 4.  sizeof(int) > 4 is fine; all the world's not a VAX.
  66  */
  67
  68 static int      inet_pton4 __P((const char *src, u_char *dst));
  69 #ifdef INET6
  70 static int      inet_pton6 __P((const char *src, u_char *dst));
  71 #endif
  72
  73 /* int
  74  * inet_pton(af, src, dst)
  75  *      convert from presentation format (which usually means ASCII printable)
  76  *      to network format (which is usually some kind of binary format).
  77  * return:
  78  *      1 if the address was valid for the specified address family
  79  *      0 if the address wasn't valid (`dst' is untouched in this case)
  80  *      -1 if some other error occurred (`dst' is untouched in this case, too)
  81  * author:
  82  *      Paul Vixie, 1996.
  83  */
  84 int
  85 inet_pton(int af, const char *src, void *dst)
  86 {
  87         int status;
  88         unsigned short ifnum;
  89         char *p, *s;
  90
  91         switch (af)
  92         {
  93                 case AF_INET:
  94                 {
  95                         return (inet_pton4(src, dst));
  96                 }
  97
  98 #ifdef INET6
  99                 case AF_INET6:
 100                 {
 101                         ifnum = 0;
 102                         p = NULL;
 103                         s = (char *)src;
 104
 105                         if (src != NULL) p = strrchr(src, '%');
 106                         if (p != NULL)
 107                         {
 108                                 s = strdup(src);
 109                                 if (s == NULL)
 110                                 {
 111                                         errno = ENOMEM;
 112                                         return -1;
 113                                 }
 114
 115                                 s[p - src] = '\0';
 116                         }
 117
 118                         status = inet_pton6(s, dst);
 119                         if (p != NULL) free(s);
 120                         if (status != 1) return status;
 121
 122                         if ((p != NULL) && IN6_IS_ADDR_LINKLOCAL((struct in6_addr *)dst))
 123                         {
 124                                 ifnum = if_nametoindex(++p);
 125                                 ifnum = htons(ifnum);
 126                                 ((struct in6_addr *)dst)->__u6_addr.__u6_addr16[1] = ifnum;
 127                         }
 128
 129                         return 1;
 130                 }
 131 #endif
 132
 133                 default:
 134                 {
 135                         errno = EAFNOSUPPORT;
 136                         return -1;
 137                 }
 138         }
 139
 140         /* NOTREACHED */
 141         return -1;
 142 }
 143
 144 /* int
 145  * inet_pton4(src, dst)
 146  *      like inet_aton() but without all the hexadecimal and shorthand.
 147  * return:
 148  *      1 if `src' is a valid dotted quad, else 0.
 149  * notice:
 150  *      does not touch `dst' unless it's returning 1.
 151  * author:
 152  *      Paul Vixie, 1996.
 153  */
 154 static int
 155 inet_pton4(const char *src, u_char *dst)
 156 {
 157         static const char digits[] = "0123456789";
 158         int saw_digit, octets, ch;
 159         u_char tmp[NS_INADDRSZ], *tp;
 160
 161         saw_digit = 0;
 162         octets = 0;
 163         *(tp = tmp) = 0;
 164         while ((ch = *src++) != '\0') {
 165                 const char *pch;
 166
 167                 if ((pch = strchr(digits, ch)) != NULL) {
 168                         u_int new = *tp * 10 + (pch - digits);
 169
 170                         if (new > 255)
 171                                 return (0);
 172                         *tp = new;
 173                         if (! saw_digit) {
 174                                 if (++octets > 4)
 175                                         return (0);
 176                                 saw_digit = 1;
 177                         }
 178                 } else if (ch == '.' && saw_digit) {
 179                         if (octets == 4)
 180                                 return (0);
 181                         *++tp = 0;
 182                         saw_digit = 0;
 183                 } else
 184                         return (0);
 185         }
 186         if (octets < 4)
 187                 return (0);
 188         memcpy(dst, tmp, NS_INADDRSZ);
 189         return (1);
 190 }
 191
 192 #ifdef INET6
 193 /* int
 194  * inet_pton6(src, dst)
 195  *      convert presentation level address to network order binary form.
 196  * return:
 197  *      1 if `src' is a valid [RFC1884 2.2] address, else 0.
 198  * notice:
 199  *      (1) does not touch `dst' unless it's returning 1.
 200  *      (2) :: in a full address is silently ignored.
 201  * credit:
 202  *      inspired by Mark Andrews.
 203  * author:
 204  *      Paul Vixie, 1996.
 205  */
 206 static int
 207 inet_pton6(const char *src, u_char *dst)
 208 {
 209         static const char xdigits_l[] = "0123456789abcdef",
 210         xdigits_u[] = "0123456789ABCDEF";
 211         u_char tmp[NS_IN6ADDRSZ], *tp, *endp, *colonp;
 212         const char *xdigits, *curtok;
 213         int ch, saw_xdigit;
 214         u_int val;
 215
 216         memset((tp = tmp), '\0', NS_IN6ADDRSZ);
 217         endp = tp + NS_IN6ADDRSZ;
 218         colonp = NULL;
 219         /* Leading :: requires some special handling. */
 220         if (*src == ':')
 221                 if (*++src != ':')
 222                         return (0);
 223         curtok = src;
 224         saw_xdigit = 0;
 225         val = 0;
 226         while ((ch = *src++) != '\0') {
 227                 const char *pch;
 228
 229                 if ((pch = strchr((xdigits = xdigits_l), ch)) == NULL)
 230                         pch = strchr((xdigits = xdigits_u), ch);
 231                 if (pch != NULL) {
 232                         val <<= 4;
 233                         val |= (pch - xdigits);
 234                         if (val > 0xffff)
 235                                 return (0);
 236                         saw_xdigit = 1;
 237                         continue;
 238                 }
 239                 if (ch == ':') {
 240                         curtok = src;
 241                         if (!saw_xdigit) {
 242                                 if (colonp)
 243                                         return (0);
 244                                 colonp = tp;
 245                                 continue;
 246                         } else if (*src == '\0') {
 247                                 return (0);
 248                         }
 249                         if (tp + NS_INT16SZ > endp)
 250                                 return (0);
 251                         *tp++ = (u_char) (val >> 8) & 0xff;
 252                         *tp++ = (u_char) val & 0xff;
 253                         saw_xdigit = 0;
 254                         val = 0;
 255                         continue;
 256                 }
 257                 if (ch == '.' && ((tp + NS_INADDRSZ) <= endp) &&
 258                     inet_pton4(curtok, tp) > 0) {
 259                         tp += NS_INADDRSZ;
 260                         saw_xdigit = 0;
 261                         break;  /* '\0' was seen by inet_pton4(). */
 262                 }
 263                 return (0);
 264         }
 265         if (saw_xdigit) {
 266                 if (tp + NS_INT16SZ > endp)
 267                         return (0);
 268                 *tp++ = (u_char) (val >> 8) & 0xff;
 269                 *tp++ = (u_char) val & 0xff;
 270         }
 271         if (colonp != NULL) {
 272                 /*
 273                  * Since some memmove()'s erroneously fail to handle
 274                  * overlapping regions, we'll do the shift by hand.
 275                  */
 276                 const int n = tp - colonp;
 277                 int i;
 278
 279                 if (tp == endp)
 280                         return (0);
 281                 for (i = 1; i <= n; i++) {
 282                         endp[- i] = colonp[n - i];
 283                         colonp[n - i] = 0;
 284                 }
 285                 tp = endp;
 286         }
 287         if (tp != endp)
 288                 return (0);
 289         memcpy(dst, tmp, NS_IN6ADDRSZ);
 290         return (1);
 291 }
 292 #endif /*INET6*/