The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/rpc/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 
   18 #if defined(LIBC_SCCS) && !defined(lint)
   19 static const char rcsid[] = "$Id: inet_pton.c,v 1.3.18.2 2005/07/28 07:38:07 marka Exp $";
   20 #endif /* LIBC_SCCS and not lint */
   21 #include <sys/cdefs.h>
   22 __FBSDID("$FreeBSD$");
   23 
   24 #include <sys/param.h>
   25 #include <sys/types.h>
   26 #include <sys/socket.h>
   27 #include <sys/systm.h>
   28 
   29 #include <rpc/types.h>
   30 #include <rpc/rpc_com.h>
   31 
   32 #if __FreeBSD_version < 700000
   33 #define strchr index
   34 #endif
   35 
   36 /*%
   37  * WARNING: Don't even consider trying to compile this on a system where
   38  * sizeof(int) < 4.  sizeof(int) > 4 is fine; all the world's not a VAX.
   39  */
   40 
   41 static int      inet_pton4(const char *src, u_char *dst);
   42 static int      inet_pton6(const char *src, u_char *dst);
   43 
   44 /* int
   45  * inet_pton(af, src, dst)
   46  *      convert from presentation format (which usually means ASCII printable)
   47  *      to network format (which is usually some kind of binary format).
   48  * return:
   49  *      1 if the address was valid for the specified address family
   50  *      0 if the address wasn't valid (`dst' is untouched in this case)
   51  *      -1 if some other error occurred (`dst' is untouched in this case, too)
   52  * author:
   53  *      Paul Vixie, 1996.
   54  */
   55 int
   56 __rpc_inet_pton(int af, const char * __restrict src, void * __restrict dst)
   57 {
   58         switch (af) {
   59         case AF_INET:
   60                 return (inet_pton4(src, dst));
   61         case AF_INET6:
   62                 return (inet_pton6(src, dst));
   63         default:
   64                 return (-1);
   65         }
   66         /* NOTREACHED */
   67 }
   68 
   69 /* int
   70  * inet_pton4(src, dst)
   71  *      like inet_aton() but without all the hexadecimal and shorthand.
   72  * return:
   73  *      1 if `src' is a valid dotted quad, else 0.
   74  * notice:
   75  *      does not touch `dst' unless it's returning 1.
   76  * author:
   77  *      Paul Vixie, 1996.
   78  */
   79 static int
   80 inet_pton4(const char *src, u_char *dst)
   81 {
   82         static const char digits[] = "0123456789";
   83         int saw_digit, octets, ch;
   84 #define NS_INADDRSZ     4
   85         u_char tmp[NS_INADDRSZ], *tp;
   86 
   87         saw_digit = 0;
   88         octets = 0;
   89         *(tp = tmp) = 0;
   90         while ((ch = *src++) != '\0') {
   91                 const char *pch;
   92 
   93                 if ((pch = strchr(digits, ch)) != NULL) {
   94                         u_int new = *tp * 10 + (pch - digits);
   95 
   96                         if (saw_digit && *tp == 0)
   97                                 return (0);
   98                         if (new > 255)
   99                                 return (0);
  100                         *tp = new;
  101                         if (!saw_digit) {
  102                                 if (++octets > 4)
  103                                         return (0);
  104                                 saw_digit = 1;
  105                         }
  106                 } else if (ch == '.' && saw_digit) {
  107                         if (octets == 4)
  108                                 return (0);
  109                         *++tp = 0;
  110                         saw_digit = 0;
  111                 } else
  112                         return (0);
  113         }
  114         if (octets < 4)
  115                 return (0);
  116         memcpy(dst, tmp, NS_INADDRSZ);
  117         return (1);
  118 }
  119 
  120 /* int
  121  * inet_pton6(src, dst)
  122  *      convert presentation level address to network order binary form.
  123  * return:
  124  *      1 if `src' is a valid [RFC1884 2.2] address, else 0.
  125  * notice:
  126  *      (1) does not touch `dst' unless it's returning 1.
  127  *      (2) :: in a full address is silently ignored.
  128  * credit:
  129  *      inspired by Mark Andrews.
  130  * author:
  131  *      Paul Vixie, 1996.
  132  */
  133 static int
  134 inet_pton6(const char *src, u_char *dst)
  135 {
  136         static const char xdigits_l[] = "0123456789abcdef",
  137                           xdigits_u[] = "0123456789ABCDEF";
  138 #define NS_IN6ADDRSZ    16
  139 #define NS_INT16SZ      2
  140         u_char tmp[NS_IN6ADDRSZ], *tp, *endp, *colonp;
  141         const char *xdigits, *curtok;
  142         int ch, seen_xdigits;
  143         u_int val;
  144 
  145         memset((tp = tmp), '\0', NS_IN6ADDRSZ);
  146         endp = tp + NS_IN6ADDRSZ;
  147         colonp = NULL;
  148         /* Leading :: requires some special handling. */
  149         if (*src == ':')
  150                 if (*++src != ':')
  151                         return (0);
  152         curtok = src;
  153         seen_xdigits = 0;
  154         val = 0;
  155         while ((ch = *src++) != '\0') {
  156                 const char *pch;
  157 
  158                 if ((pch = strchr((xdigits = xdigits_l), ch)) == NULL)
  159                         pch = strchr((xdigits = xdigits_u), ch);
  160                 if (pch != NULL) {
  161                         val <<= 4;
  162                         val |= (pch - xdigits);
  163                         if (++seen_xdigits > 4)
  164                                 return (0);
  165                         continue;
  166                 }
  167                 if (ch == ':') {
  168                         curtok = src;
  169                         if (!seen_xdigits) {
  170                                 if (colonp)
  171                                         return (0);
  172                                 colonp = tp;
  173                                 continue;
  174                         } else if (*src == '\0') {
  175                                 return (0);
  176                         }
  177                         if (tp + NS_INT16SZ > endp)
  178                                 return (0);
  179                         *tp++ = (u_char) (val >> 8) & 0xff;
  180                         *tp++ = (u_char) val & 0xff;
  181                         seen_xdigits = 0;
  182                         val = 0;
  183                         continue;
  184                 }
  185                 if (ch == '.' && ((tp + NS_INADDRSZ) <= endp) &&
  186                     inet_pton4(curtok, tp) > 0) {
  187                         tp += NS_INADDRSZ;
  188                         seen_xdigits = 0;
  189                         break;  /*%< '\\' was seen by inet_pton4(). */
  190                 }
  191                 return (0);
  192         }
  193         if (seen_xdigits) {
  194                 if (tp + NS_INT16SZ > endp)
  195                         return (0);
  196                 *tp++ = (u_char) (val >> 8) & 0xff;
  197                 *tp++ = (u_char) val & 0xff;
  198         }
  199         if (colonp != NULL) {
  200                 /*
  201                  * Since some memmove()'s erroneously fail to handle
  202                  * overlapping regions, we'll do the shift by hand.
  203                  */
  204                 const int n = tp - colonp;
  205                 int i;
  206 
  207                 if (tp == endp)
  208                         return (0);
  209                 for (i = 1; i <= n; i++) {
  210                         endp[- i] = colonp[n - i];
  211                         colonp[n - i] = 0;
  212                 }
  213                 tp = endp;
  214         }
  215         if (tp != endp)
  216                 return (0);
  217         memcpy(dst, tmp, NS_IN6ADDRSZ);
  218         return (1);
  219 }
  220 
  221 /*
  222  * Weak aliases for applications that use certain private entry points,
  223  * and fail to include <arpa/inet.h>.
  224  */
  225 #undef inet_pton
  226 __weak_reference(__inet_pton, inet_pton);
  227 
  228 /*! \file */

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