/*      $KAME: inet_pton.c,v 1.5 2001/08/20 02:32:40 itojun Exp $       */

/* Copyright (c) 1996 by Internet Software Consortium.
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
* ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
* CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
* DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
* PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
* ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
* SOFTWARE.
*/

#include <config.h>

#include <string.h>
#include <stdio.h>
#include <errno.h>

/*
* WARNING: Don't even consider trying to compile this on a system where
* sizeof(int) < 4.  sizeof(int) > 4 is fine; all the world's not a VAX.
*/

static int      inet_pton4 (const char *src, uint8_t *dst);
static int      inet_pton6 (const char *src, uint8_t *dst);

/*
*
* The definitions we might miss.
*
*/
#ifndef NS_INT16SZ
#define NS_INT16SZ      2
#endif

#ifndef NS_IN6ADDRSZ
#define NS_IN6ADDRSZ 16
#endif

#ifndef NS_INADDRSZ
#define NS_INADDRSZ 4
#endif

/* int
* inet_pton(af, src, dst)
*      convert from presentation format (which usually means ASCII printable)
*      to network format (which is usually some kind of binary format).
* return:
*      1 if the address was valid for the specified address family
*      0 if the address wasn't valid (`dst' is untouched in this case)
*      -1 if some other error occurred (`dst' is untouched in this case, too)
* author:
*      Paul Vixie, 1996.
*/
int
inet_pton(af, src, dst)
       int af;
       const char *src;
       void *dst;
{
       switch (af) {
       case AF_INET:
               return (inet_pton4(src, dst));
       case AF_INET6:
               return (inet_pton6(src, dst));
       default:
               errno = EAFNOSUPPORT;
               return (-1);
       }
       /* NOTREACHED */
}

/* int
* inet_pton4(src, dst)
*      like inet_aton() but without all the hexadecimal and shorthand.
* return:
*      1 if `src' is a valid dotted quad, else 0.
* notice:
*      does not touch `dst' unless it's returning 1.
* author:
*      Paul Vixie, 1996.
*/
static int
inet_pton4(src, dst)
       const char *src;
       uint8_t *dst;
{
       static const char digits[] = "0123456789";
       int saw_digit, octets, ch;
       uint8_t tmp[NS_INADDRSZ], *tp;

       saw_digit = 0;
       octets = 0;
       *(tp = tmp) = 0;
       while ((ch = *src++) != '\0') {
               const char *pch;

               if ((pch = strchr(digits, ch)) != NULL) {
                       uint32_t new = *tp * 10 + (pch - digits);

                       if (new > 255)
                               return (0);
                       *tp = new;
                       if (! saw_digit) {
                               if (++octets > 4)
                                       return (0);
                               saw_digit = 1;
                       }
               } else if (ch == '.' && saw_digit) {
                       if (octets == 4)
                               return (0);
                       *++tp = 0;
                       saw_digit = 0;
               } else
                       return (0);
       }
       if (octets < 4)
               return (0);

       memcpy(dst, tmp, NS_INADDRSZ);
       return (1);
}

/* int
* inet_pton6(src, dst)
*      convert presentation level address to network order binary form.
* return:
*      1 if `src' is a valid [RFC1884 2.2] address, else 0.
* notice:
*      (1) does not touch `dst' unless it's returning 1.
*      (2) :: in a full address is silently ignored.
* credit:
*      inspired by Mark Andrews.
* author:
*      Paul Vixie, 1996.
*/
static int
inet_pton6(src, dst)
       const char *src;
       uint8_t *dst;
{
       static const char xdigits_l[] = "0123456789abcdef",
                         xdigits_u[] = "0123456789ABCDEF";
       uint8_t tmp[NS_IN6ADDRSZ], *tp, *endp, *colonp;
       const char *xdigits, *curtok;
       int ch, saw_xdigit;
       uint32_t val;

       memset((tp = tmp), '\0', NS_IN6ADDRSZ);
       endp = tp + NS_IN6ADDRSZ;
       colonp = NULL;
       /* Leading :: requires some special handling. */
       if (*src == ':')
               if (*++src != ':')
                       return (0);
       curtok = src;
       saw_xdigit = 0;
       val = 0;
       while ((ch = *src++) != '\0') {
               const char *pch;

               if ((pch = strchr((xdigits = xdigits_l), ch)) == NULL)
                       pch = strchr((xdigits = xdigits_u), ch);
               if (pch != NULL) {
                       val <<= 4;
                       val |= (pch - xdigits);
                       if (val > 0xffff)
                               return (0);
                       saw_xdigit = 1;
                       continue;
               }
               if (ch == ':') {
                       curtok = src;
                       if (!saw_xdigit) {
                               if (colonp)
                                       return (0);
                               colonp = tp;
                               continue;
                       }
                       if (tp + NS_INT16SZ > endp)
                               return (0);
                       *tp++ = (uint8_t) (val >> 8) & 0xff;
                       *tp++ = (uint8_t) val & 0xff;
                       saw_xdigit = 0;
                       val = 0;
                       continue;
               }
               if (ch == '.' && ((tp + NS_INADDRSZ) <= endp) &&
                   inet_pton4(curtok, tp) > 0) {
                       tp += NS_INADDRSZ;
                       saw_xdigit = 0;
                       break;  /* '\0' was seen by inet_pton4(). */
               }
               return (0);
       }
       if (saw_xdigit) {
               if (tp + NS_INT16SZ > endp)
                       return (0);
               *tp++ = (uint8_t) (val >> 8) & 0xff;
               *tp++ = (uint8_t) val & 0xff;
       }
       if (colonp != NULL) {
               /*
                * Since some memmove()'s erroneously fail to handle
                * overlapping regions, we'll do the shift by hand.
                */
               const int n = tp - colonp;
               int i;

               for (i = 1; i <= n; i++) {
                       endp[- i] = colonp[n - i];
                       colonp[n - i] = 0;
               }
               tp = endp;
       }
       if (tp != endp)
               return (0);
       memcpy(dst, tmp, NS_IN6ADDRSZ);
       return (1);
}

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