source: EcnlProtoTool/trunk/mrbgems/mruby-tls-openssl/src/inet_pton.c@ 331

/*  $OpenBSD: inet_pton.c,v 1.9 2015/01/16 16:48:51 deraadt Exp $ */
// from https://raw.githubusercontent.com/libressl-portable/portable/master/crypto/compat/inet_pton.c

/* 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.
 */
#ifdef _WIN32
#include <win32netcompat.h>
#include <sys/types.h>
#include <string.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, u_char *dst);
static int  inet_pton6(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(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(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:
 *  does not touch `dst' unless it's returning 1.
 * credit:
 *  inspired by Mark Andrews.
 * author:
 *  Paul Vixie, 1996.
 */
static int
inet_pton6(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, count_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 = count_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) {
      if (count_xdigit >= 4)
        return (0);
      val <<= 4;
      val |= (pch - xdigits);
      if (val > 0xffff)
        return (0);
      saw_xdigit = 1;
      count_xdigit++;
      continue;
    }
    if (ch == ':') {
      curtok = src;
      if (!saw_xdigit) {
        if (colonp)
          return (0);
        colonp = tp;
        continue;
      } else if (*src == '\0') {
        return (0);
      }
      if (tp + INT16SZ > endp)
        return (0);
      *tp++ = (u_char) (val >> 8) & 0xff;
      *tp++ = (u_char) val & 0xff;
      saw_xdigit = 0;
      count_xdigit = 0;
      val = 0;
      continue;
    }
    if (ch == '.' && ((tp + INADDRSZ) <= endp) &&
        inet_pton4(curtok, tp) > 0) {
      tp += INADDRSZ;
      saw_xdigit = 0;
      count_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;

    if (tp == endp)
      return (0);
    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);
}
#endif