inet_pton.c

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    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 #if defined(LIBC_SCCS) && !defined(lint)
   18 static const char rcsid[] = "$Id: inet_pton.c,v 1.3.18.2 2005/07/28 07:38:07 marka Exp $";
   19 #endif /* LIBC_SCCS and not lint */
   20 
   21 #include <string.h>
   22 
   23 #include <sys/param.h>
   24 #include <sys/socket.h>
   25 #include <sys/systm.h>
   26 
   27 #include <netinet/in.h>
   28 
   29 /*%
   30  * WARNING: Don't even consider trying to compile this on a system where
   31  * sizeof(int) < 4.  sizeof(int) > 4 is fine; all the world's not a VAX.
   32  */
   33 
   34 static int      inet_pton4(const char *src, u_char *dst);
   35 static int      inet_pton6(const char *src, u_char *dst);
   36 
   37 /* int
   38  * inet_pton(af, src, dst)
   39  *      convert from presentation format (which usually means ASCII printable)
   40  *      to network format (which is usually some kind of binary format).
   41  * return:
   42  *      1 if the address was valid for the specified address family
   43  *      0 if the address wasn't valid (`dst' is untouched in this case)
   44  *      -1 if some other error occurred (`dst' is untouched in this case, too)
   45  * author:
   46  *      Paul Vixie, 1996.
   47  */
   48 int
   49 inet_pton(int af, const char *src, void *dst)
   50 {
   51         switch (af) {
   52         case AF_INET:
   53                 return inet_pton4(src, dst);
   54         case AF_INET6:
   55                 return inet_pton6(src, dst);
   56         default:
   57                 return -1;
   58         }
   59         /* NOTREACHED */
   60 }
   61 
   62 /* int
   63  * inet_pton4(src, dst)
   64  *      like inet_aton() but without all the hexadecimal and shorthand.
   65  * return:
   66  *      1 if `src' is a valid dotted quad, else 0.
   67  * notice:
   68  *      does not touch `dst' unless it's returning 1.
   69  * author:
   70  *      Paul Vixie, 1996.
   71  */
   72 static int
   73 inet_pton4(const char *src, u_char *dst)
   74 {
   75         static const char digits[] = "0123456789";
   76         int saw_digit, octets, ch;
   77 #define NS_INADDRSZ     4
   78         u_char tmp[NS_INADDRSZ], *tp;
   79 
   80         saw_digit = 0;
   81         octets = 0;
   82         *(tp = tmp) = 0;
   83         while ((ch = *src++) != '\0') {
   84                 const char *pch;
   85 
   86                 if ((pch = strchr(digits, ch)) != NULL) {
   87                         u_int new = *tp * 10 + (u_int)(pch - digits);
   88 
   89                         if (saw_digit && *tp == 0) {
   90                                 return 0;
   91                         }
   92                         if (new > 255) {
   93                                 return 0;
   94                         }
   95                         *tp = (u_char)new;
   96                         if (!saw_digit) {
   97                                 if (++octets > 4) {
   98                                         return 0;
   99                                 }
  100                                 saw_digit = 1;
  101                         }
  102                 } else if (ch == '.' && saw_digit) {
  103                         if (octets == 4) {
  104                                 return 0;
  105                         }
  106                         *++tp = 0;
  107                         saw_digit = 0;
  108                 } else {
  109                         return 0;
  110                 }
  111         }
  112         if (octets < 4) {
  113                 return 0;
  114         }
  115         memcpy(dst, tmp, NS_INADDRSZ);
  116         return 1;
  117 }
  118 
  119 /* int
  120  * inet_pton6(src, dst)
  121  *      convert presentation level address to network order binary form.
  122  * return:
  123  *      1 if `src' is a valid [RFC1884 2.2] address, else 0.
  124  * notice:
  125  *      (1) does not touch `dst' unless it's returning 1.
  126  *      (2) :: in a full address is silently ignored.
  127  * credit:
  128  *      inspired by Mark Andrews.
  129  * author:
  130  *      Paul Vixie, 1996.
  131  */
  132 static int
  133 inet_pton6(const char *src, u_char *dst)
  134 {
  135         static const char xdigits_l[] = "0123456789abcdef",
  136             xdigits_u[] = "0123456789ABCDEF";
  137 #define NS_IN6ADDRSZ    16
  138 #define NS_INT16SZ      2
  139         u_char tmp[NS_IN6ADDRSZ], *tp, *endp, *colonp;
  140         const char *xdigits, *curtok;
  141         int ch, seen_xdigits;
  142         u_int val;
  143 
  144         memset((tp = tmp), '\0', NS_IN6ADDRSZ);
  145         endp = tp + NS_IN6ADDRSZ;
  146         colonp = NULL;
  147         /* Leading :: requires some special handling. */
  148         if (*src == ':') {
  149                 if (*++src != ':') {
  150                         return 0;
  151                 }
  152         }
  153         curtok = src;
  154         seen_xdigits = 0;
  155         val = 0;
  156         while ((ch = *src++) != '\0') {
  157                 const char *pch;
  158 
  159                 if ((pch = strchr((xdigits = xdigits_l), ch)) == NULL) {
  160                         pch = strchr((xdigits = xdigits_u), ch);
  161                 }
  162                 if (pch != NULL) {
  163                         val <<= 4;
  164                         val |= (pch - xdigits);
  165                         if (++seen_xdigits > 4) {
  166                                 return 0;
  167                         }
  168                         continue;
  169                 }
  170                 if (ch == ':') {
  171                         curtok = src;
  172                         if (!seen_xdigits) {
  173                                 if (colonp) {
  174                                         return 0;
  175                                 }
  176                                 colonp = tp;
  177                                 continue;
  178                         } else if (*src == '\0') {
  179                                 return 0;
  180                         }
  181                         if (tp + NS_INT16SZ > endp) {
  182                                 return 0;
  183                         }
  184                         *tp++ = (u_char) (val >> 8) & 0xff;
  185                         *tp++ = (u_char) val & 0xff;
  186                         seen_xdigits = 0;
  187                         val = 0;
  188                         continue;
  189                 }
  190                 if (ch == '.' && ((tp + NS_INADDRSZ) <= endp) &&
  191                     inet_pton4(curtok, tp) > 0) {
  192                         tp += NS_INADDRSZ;
  193                         seen_xdigits = 0;
  194                         break;  /*%< '\\' was seen by inet_pton4(). */
  195                 }
  196                 return 0;
  197         }
  198         if (seen_xdigits) {
  199                 if (tp + NS_INT16SZ > endp) {
  200                         return 0;
  201                 }
  202                 *tp++ = (u_char) (val >> 8) & 0xff;
  203                 *tp++ = (u_char) val & 0xff;
  204         }
  205         if (colonp != NULL) {
  206                 /*
  207                  * Since some memmove()'s erroneously fail to handle
  208                  * overlapping regions, we'll do the shift by hand.
  209                  */
  210                 const long n = tp - colonp;
  211                 int i;
  212 
  213                 if (tp == endp) {
  214                         return 0;
  215                 }
  216                 for (i = 1; i <= n; i++) {
  217                         endp[-i] = colonp[n - i];
  218                         colonp[n - i] = 0;
  219                 }
  220                 tp = endp;
  221         }
  222         if (tp != endp) {
  223                 return 0;
  224         }
  225         memcpy(dst, tmp, NS_IN6ADDRSZ);
  226         return 1;
  227 }

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FreeBSD/Linux Kernel Cross Reference sys/libkern/net/inet_pton.c

FreeBSD/Linux Kernel Cross Reference
sys/libkern/net/inet_pton.c