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inet_pton.c

/* $Id: inet_pton.c,v 1.3 1999/05/13 16:35:56 karls Exp $ */

#ifdef HAVE_CONFIG_H
#include "autoconf.h"
#endif  /* HAVE_CONFIG_H */

#include "common.h"

#if !HAVE_INET_PTON

/*    $OpenBSD: inet_pton.c,v 1.2 1997/04/13 05:08:24 deraadt 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.
 */

#if defined(LIBC_SCCS) && !defined(lint)
#if 0
static char rcsid[] = "$From: inet_pton.c,v 8.7 1996/08/05 08:31:35 vixie Exp $";
#else
static char rcsid[] = "$OpenBSD: inet_pton.c,v 1.2 1997/04/13 05:08:24 deraadt Exp $";
#endif
#endif /* LIBC_SCCS and not lint */

#if 0
#include <sys/param.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <arpa/nameser.h>
#include <string.h>
#include <errno.h>
#endif


#ifndef AF_INET6
#define     AF_INET6  24     /* IPv6 */
#endif /* !AF_INET6 */
#ifndef INADDRSZ
#define INADDRSZ        4               /* IPv4 T_A */
#endif /* !INADDRSZ */
#ifndef IN6ADDRSZ
#define IN6ADDRSZ 16      /* IPv6 T_AAAA */
#endif /* !IN6ADDRSZ */
#ifndef INT16SZ
#define INT16SZ     2     /* for systems without 16-bit ints */
#endif /* !INT16SZ */

/*
 * 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 __P((const char *src, u_char *dst));
static int  inet_pton6 __P((const char *src, u_char *dst));

/* 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;
      u_char *dst;
{
      static const char digits[] = "0123456789";
      int saw_digit, octets, ch;
      u_char tmp[INADDRSZ], *tp;

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

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

                  if (new > 255)
                        return (0);
                  if (! saw_digit) {
                        if (++octets > 4)
                              return (0);
                        saw_digit = 1;
                  }
                  *tp = new;
            } 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, 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;
      u_char *dst;
{
      static const char xdigits_l[] = "0123456789abcdef",
                    xdigits_u[] = "0123456789ABCDEF";
      u_char tmp[IN6ADDRSZ], *tp, *endp, *colonp;
      const char *xdigits, *curtok;
      int ch, saw_xdigit;
      u_int val;

      memset((tp = tmp), '\0', IN6ADDRSZ);
      endp = tp + 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 + INT16SZ > endp)
                        return (0);
                  *tp++ = (u_char) (val >> 8) & 0xff;
                  *tp++ = (u_char) val & 0xff;
                  saw_xdigit = 0;
                  val = 0;
                  continue;
            }
            if (ch == '.' && ((tp + INADDRSZ) <= endp) &&
                inet_pton4(curtok, tp) > 0) {
                  tp += INADDRSZ;
                  saw_xdigit = 0;
                  break;      /* '\0' was seen by inet_pton4(). */
            }
            return (0);
      }
      if (saw_xdigit) {
            if (tp + INT16SZ > endp)
                  return (0);
            *tp++ = (u_char) (val >> 8) & 0xff;
            *tp++ = (u_char) 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, IN6ADDRSZ);
      return (1);
}
#else
static void avoid_error __P((void));
static void avoid_error()
{
      avoid_error();
}
#endif /* !HAVE_INET_PTON */

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