workbench/network/stacks/AROSTCP/bsdsocket/api/inet_pton.c

   1 /*      $KAME: inet_pton.c,v 1.0 2005/11/14 15:49:40 SONIC Exp $        */
   2
   3 /* Copyright (c) 1996 by Internet Software Consortium.
   4  * Copyright (c) 2005 by Pavel Fedin.
   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 <amitcp/socketbasetags.h>
  21 #include <emul/emulregs.h>
  22 #include <proto/socket.h>
  23 #include <sys/cdefs.h>
  24 #include <sys/param.h>
  25 #include <sys/types.h>
  26 #include <sys/socket.h>
  27 #include <netinet/in.h>
  28 #include <arpa/inet.h>
  29 #include <arpa/nameser.h>
  30 #include <string.h>
  31 #include <errno.h>
  32
  33 /*
  34  * WARNING: Don't even consider trying to compile this on a system where
  35  * sizeof(int) < 4.  sizeof(int) > 4 is fine; all the world's not a VAX.
  36  */
  37
  38 static int      inet_pton4(const char *src, u_char *dst);
  39 static int      inet_pton6(const char *src, u_char *dst);
  40
  41 /* int
  42  * inet_pton(af, src, dst)
  43  *      convert from presentation format (which usually means ASCII printable)
  44  *      to network format (which is usually some kind of binary format).
  45  * return:
  46  *      1 if the address was valid for the specified address family
  47  *      0 if the address wasn't valid (`dst' is untouched in this case)
  48  *      -1 if some other error occurred (`dst' is untouched in this case, too)
  49  * author:
  50  *      Paul Vixie, 1996.
  51  */
  52 int
  53 __inet_pton(int af, const char * __restrict src, void * __restrict dst)
  54 {
  55         switch (af) {
  56         case AF_INET:
  57                 return (inet_pton4(src, dst));
  58         case AF_INET6:
  59                 return (inet_pton6(src, dst));
  60         default:
  61                 SocketBaseTags(SBTM_SETVAL(SBTC_ERRNO),EAFNOSUPPORT,TAG_DONE);
  62                 return (-1);
  63         }
  64         /* NOTREACHED */
  65 }
  66
  67 int inet_pton(void)
  68 {
  69         int af = REG_D0;
  70         const char *src = (const char *)REG_A0;
  71         void *dst  = (void *)REG_A1;
  72
  73         return __inet_pton(af, src, dst);
  74 }
  75
  76 /* int
  77  * inet_pton4(src, dst)
  78  *      like inet_aton() but without all the hexadecimal and shorthand.
  79  * return:
  80  *      1 if `src' is a valid dotted quad, else 0.
  81  * notice:
  82  *      does not touch `dst' unless it's returning 1.
  83  * author:
  84  *      Paul Vixie, 1996.
  85  */
  86 static int
  87 inet_pton4(const char *src, u_char *dst)
  88 {
  89         static const char digits[] = "0123456789";
  90         int saw_digit, octets, ch;
  91         u_char tmp[NS_INADDRSZ], *tp;
  92
  93         saw_digit = 0;
  94         octets = 0;
  95         *(tp = tmp) = 0;
  96         while ((ch = *src++) != '\0') {
  97                 const char *pch;
  98
  99                 if ((pch = strchr(digits, ch)) != NULL) {
 100                         u_int new = *tp * 10 + (pch - digits);
 101
 102                         if (new > 255)
 103                                 return (0);
 104                         *tp = new;
 105                         if (! saw_digit) {
 106                                 if (++octets > 4)
 107                                         return (0);
 108                                 saw_digit = 1;
 109                         }
 110                 } else if (ch == '.' && saw_digit) {
 111                         if (octets == 4)
 112                                 return (0);
 113                         *++tp = 0;
 114                         saw_digit = 0;
 115                 } else
 116                         return (0);
 117         }
 118         if (octets < 4)
 119                 return (0);
 120
 121         memcpy(dst, tmp, NS_INADDRSZ);
 122         return (1);
 123 }
 124
 125 /* int
 126  * inet_pton6(src, dst)
 127  *      convert presentation level address to network order binary form.
 128  * return:
 129  *      1 if `src' is a valid [RFC1884 2.2] address, else 0.
 130  * notice:
 131  *      (1) does not touch `dst' unless it's returning 1.
 132  *      (2) :: in a full address is silently ignored.
 133  * credit:
 134  *      inspired by Mark Andrews.
 135  * author:
 136  *      Paul Vixie, 1996.
 137  */
 138 static int
 139 inet_pton6(const char *src, u_char *dst)
 140 {
 141         static const char xdigits_l[] = "0123456789abcdef",
 142                           xdigits_u[] = "0123456789ABCDEF";
 143         u_char tmp[NS_IN6ADDRSZ], *tp, *endp, *colonp;
 144         const char *xdigits, *curtok;
 145         int ch, saw_xdigit;
 146         u_int val;
 147
 148         memset((tp = tmp), '\0', NS_IN6ADDRSZ);
 149         endp = tp + NS_IN6ADDRSZ;
 150         colonp = NULL;
 151         /* Leading :: requires some special handling. */
 152         if (*src == ':')
 153                 if (*++src != ':')
 154                         return (0);
 155         curtok = src;
 156         saw_xdigit = 0;
 157         val = 0;
 158         while ((ch = *src++) != '\0') {
 159                 const char *pch;
 160
 161                 if ((pch = strchr((xdigits = xdigits_l), ch)) == NULL)
 162                         pch = strchr((xdigits = xdigits_u), ch);
 163                 if (pch != NULL) {
 164                         val <<= 4;
 165                         val |= (pch - xdigits);
 166                         if (val > 0xffff)
 167                                 return (0);
 168                         saw_xdigit = 1;
 169                         continue;
 170                 }
 171                 if (ch == ':') {
 172                         curtok = src;
 173                         if (!saw_xdigit) {
 174                                 if (colonp)
 175                                         return (0);
 176                                 colonp = tp;
 177                                 continue;
 178                         }
 179                         if (tp + NS_INT16SZ > endp)
 180                                 return (0);
 181                         *tp++ = (u_char) (val >> 8) & 0xff;
 182                         *tp++ = (u_char) val & 0xff;
 183                         saw_xdigit = 0;
 184                         val = 0;
 185                         continue;
 186                 }
 187                 if (ch == '.' && ((tp + NS_INADDRSZ) <= endp) &&
 188                     inet_pton4(curtok, tp) > 0) {
 189                         tp += NS_INADDRSZ;
 190                         saw_xdigit = 0;
 191                         break;  /* '\0' was seen by inet_pton4(). */
 192                 }
 193                 return (0);
 194         }
 195         if (saw_xdigit) {
 196                 if (tp + NS_INT16SZ > endp)
 197                         return (0);
 198                 *tp++ = (u_char) (val >> 8) & 0xff;
 199                 *tp++ = (u_char) val & 0xff;
 200         }
 201         if (colonp != NULL) {
 202                 /*
 203                  * Since some memmove()'s erroneously fail to handle
 204                  * overlapping regions, we'll do the shift by hand.
 205                  */
 206                 const int n = tp - colonp;
 207                 int i;
 208
 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 }