inet_pton 이 freeBSD 에서 실현 한 소스 코드 + 커 널 소스 코드 검색 사이트

 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: head/sys/libkern/inet_pton.c 213103 2010-09-24 15:01:45Z attilio $");
   23 
   24 #include <sys/param.h>
   25 #include <sys/socket.h>
   26 #include <sys/systm.h>
   27 
   28 #include <netinet/in.h>
   29 
   30 #if __FreeBSD_version < 700000
   31 #define strchr index
   32 #endif
   33 
   34 /*%
   35  * WARNING: Don't even consider trying to compile this on a system where
   36  * sizeof(int) < 4.  sizeof(int) > 4 is fine; all the world's not a VAX.
   37  */
   38 
   39 static int      inet_pton4(const char *src, u_char *dst);
   40 static int      inet_pton6(const char *src, u_char *dst);
   41 
   42 /* int
   43  * inet_pton(af, src, dst)
   44  *      convert from presentation format (which usually means ASCII printable)
   45  *      to network format (which is usually some kind of binary format).
   46  * return:
   47  *      1 if the address was valid for the specified address family
   48  *      0 if the address wasn't valid (`dst' is untouched in this case)
   49  *      -1 if some other error occurred (`dst' is untouched in this case, too)
   50  * author:
   51  *      Paul Vixie, 1996.
   52  */
   53 int
   54 inet_pton(int af, const char *src, void *dst)
   55 {
   56         switch (af) {
   57         case AF_INET:
   58                 return (inet_pton4(src, dst));
   59         case AF_INET6:
   60                 return (inet_pton6(src, dst));
   61         default:
   62                 return (-1);
   63         }
   64         /* NOTREACHED */
   65 }
   66 
   67 /* int
   68  * inet_pton4(src, dst)
   69  *      like inet_aton() but without all the hexadecimal and shorthand.
   70  * return:
   71  *      1 if `src' is a valid dotted quad, else 0.
   72  * notice:
   73  *      does not touch `dst' unless it's returning 1.
   74  * author:
   75  *      Paul Vixie, 1996.
   76  */
   77 static int
   78 inet_pton4(const char *src, u_char *dst)
   79 {
   80         static const char digits[] = "0123456789";
   81         int saw_digit, octets, ch;
   82 #define NS_INADDRSZ     4
   83         u_char tmp[NS_INADDRSZ], *tp;
   84 
   85         saw_digit = 0;
   86         octets = 0;
   87         *(tp = tmp) = 0;
   88         while ((ch = *src++) != '\0') {
   89                 const char *pch;
   90 
   91                 if ((pch = strchr(digits, ch)) != NULL) {
   92                         u_int new = *tp * 10 + (pch - digits);
   93 
   94                         if (saw_digit && *tp == 0)
   95                                 return (0);
   96                         if (new > 255)
   97                                 return (0);
   98                         *tp = new;
   99                         if (!saw_digit) {
  100                                 if (++octets > 4)
  101                                         return (0);
  102                                 saw_digit = 1;
  103                         }
  104                 } else if (ch == '.' && saw_digit) {
  105                         if (octets == 4)
  106                                 return (0);
  107                         *++tp = 0;
  108                         saw_digit = 0;
  109                 } else
  110                         return (0);
  111         }
  112         if (octets < 4)
  113                 return (0);
  114         memcpy(dst, tmp, NS_INADDRSZ);
  115         return (1);
  116 }
  117 
  118 /* int
  119  * inet_pton6(src, dst)
  120  *      convert presentation level address to network order binary form.
  121  * return:
  122  *      1 if `src' is a valid [RFC1884 2.2] address, else 0.
  123  * notice:
  124  *      (1) does not touch `dst' unless it's returning 1.
  125  *      (2) :: in a full address is silently ignored.
  126  * credit:
  127  *      inspired by Mark Andrews.
  128  * author:
  129  *      Paul Vixie, 1996.
  130  */
  131 static int
  132 inet_pton6(const char *src, u_char *dst)
  133 {
  134         static const char xdigits_l[] = "0123456789abcdef",
  135                           xdigits_u[] = "0123456789ABCDEF";
  136 #define NS_IN6ADDRSZ    16
  137 #define NS_INT16SZ      2
  138         u_char tmp[NS_IN6ADDRSZ], *tp, *endp, *colonp;
  139         const char *xdigits, *curtok;
  140         int ch, seen_xdigits;
  141         u_int val;
  142 
  143         memset((tp = tmp), '\0', NS_IN6ADDRSZ);
  144         endp = tp + NS_IN6ADDRSZ;
  145         colonp = NULL;
  146         /* Leading :: requires some special handling. */
  147         if (*src == ':')
  148                 if (*++src != ':')
  149                         return (0);
  150         curtok = src;
  151         seen_xdigits = 0;
  152         val = 0;
  153         while ((ch = *src++) != '\0') {
  154                 const char *pch;
  155 
  156                 if ((pch = strchr((xdigits = xdigits_l), ch)) == NULL)
  157                         pch = strchr((xdigits = xdigits_u), ch);
  158                 if (pch != NULL) {
  159                         val <<= 4;
  160                         val |= (pch - xdigits);
  161                         if (++seen_xdigits > 4)
  162                                 return (0);
  163                         continue;
  164                 }
  165                 if (ch == ':') {
  166                         curtok = src;
  167                         if (!seen_xdigits) {
  168                                 if (colonp)
  169                                         return (0);
  170                                 colonp = tp;
  171                                 continue;
  172                         } else if (*src == '\0') {
  173                                 return (0);
  174                         }
  175                         if (tp + NS_INT16SZ > endp)
  176                                 return (0);
  177                         *tp++ = (u_char) (val >> 8) & 0xff;
  178                         *tp++ = (u_char) val & 0xff;
  179                         seen_xdigits = 0;
  180                         val = 0;
  181                         continue;
  182                 }
  183                 if (ch == '.' && ((tp + NS_INADDRSZ) <= endp) &&
  184                     inet_pton4(curtok, tp) > 0) {
  185                         tp += NS_INADDRSZ;
  186                         seen_xdigits = 0;
  187                         break;  /*%< '\\' was seen by inet_pton4(). */
  188                 }
  189                 return (0);
  190         }
  191         if (seen_xdigits) {
  192                 if (tp + NS_INT16SZ > endp)
  193                         return (0);
  194                 *tp++ = (u_char) (val >> 8) & 0xff;
  195                 *tp++ = (u_char) val & 0xff;
  196         }
  197         if (colonp != NULL) {
  198                 /*
  199                  * Since some memmove()'s erroneously fail to handle
  200                  * overlapping regions, we'll do the shift by hand.
  201                  */
  202                 const int n = tp - colonp;
  203                 int i;
  204 
  205                 if (tp == endp)
  206                         return (0);
  207                 for (i = 1; i <= n; i++) {
  208                         endp[- i] = colonp[n - i];
  209                         colonp[n - i] = 0;
  210                 }
  211                 tp = endp;
  212         }
  213         if (tp != endp)
  214                 return (0);
  215         memcpy(dst, tmp, NS_IN6ADDRSZ);
  216         return (1);
  217 }
  218 
  219 /*! \file */